CN115745263A - Reclaimed water recycling system for long-distance heat supply pipe network and treatment method - Google Patents
Reclaimed water recycling system for long-distance heat supply pipe network and treatment method Download PDFInfo
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Abstract
The invention discloses a reclaimed water recycling system for a long-distance heat supply pipe network, which comprises: the system comprises a pretreatment system, a deep treatment system and an electrical control system, wherein the pretreatment system and the deep treatment system are respectively and electrically connected with the electrical control system; the pretreatment system comprises: a raw water pump, a quartz sand filter, an active carbon filter, an intermediate water tank, an ultrafiltration water inlet pump, a self-cleaning filter, an ultrafiltration device and an ultrafiltration water production tank which are sequentially connected through pipelines; the deep processing system comprises: the system comprises a booster pump, a cartridge filter I, a high-pressure pump, a reverse osmosis device and an RO water production tank which are sequentially connected through pipelines; the ultrafiltration water production tank is connected with the booster pump through a pipeline. The system is simple to operate, high in automation degree, compact in structure and small in occupied area, realizes recycling of reclaimed water, saves water resources and reduces water cost. The system has the advantages of good water quality of produced water, high stability, low operation cost, high automation degree, capability of meeting the water supply requirement of a long-distance heat supply pipe network and the like.
Description
Technical Field
The invention belongs to the technical field of sewage treatment systems, and particularly relates to a reclaimed water recycling system and a reclaimed water recycling method for a long-distance heat supply pipe network.
Background
At present, tap water or underground water is mostly adopted as a water source of a long-distance heat supply pipe network, but 50% of cities in China are short of water, everyone is deficient in water resources, and the underground water level is gradually reduced due to the unregulated development and utilization, so that the water resources are exhausted. Furthermore, the cost of underground water and tap water is high, which is not beneficial to the increase of economic benefit of enterprises, so that the water source saving and the development of new low-cost water sources are particularly important.
The water conservation is known and understood correctly, but the attention is not paid to the search for new cheap water sources. The water resource can be recycled, the reclaimed water resource can be reused, and the reclaimed water refers to water which is reused in a certain range and meets a certain water quality standard after urban sewage or domestic sewage is treated. The reclaimed water is used as a water source, and the clean desalted water for removing pollutants and salinity is produced after the reclaimed water is treated by related processes, so that the use of a long-distance heat supply pipe network can be met, the pipe network is prevented from scaling and corroding, and the service life of the pipe network is prolonged.
The reclaimed water is used as a water source, so that the sewage discharge amount can be reduced, the influence of sewage on the environment is reduced, and the holding capacity of a river is relieved; meanwhile, the using amount of underground water and tap water can be reduced, fresh water resources are saved, the water using cost of enterprises is reduced, the problem of water resource shortage is relieved, and water resource recycling is realized.
The reclaimed water recycling system has great utilization value in the aspects of economic benefit, environmental benefit and social benefit, and is expected to be paid enough attention to become the focus of worldwide attention. Therefore, how to develop a reclaimed water recycling system and a treatment method for a long-distance heat supply pipe network is a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides a reclaimed water recycling system and a treatment method for a long-distance heat supply pipe network.
In order to achieve the purpose, the invention adopts the following technical scheme:
a reuse of reclaimed water system for long distance heat supply pipe network, includes: the system comprises a pretreatment system, a deep treatment system and an electrical control system, wherein the pretreatment system and the deep treatment system are respectively and electrically connected with the electrical control system;
the pretreatment system comprises: a raw water pump, a quartz sand filter, an activated carbon filter, an intermediate water tank, an ultrafiltration water inlet pump, a self-cleaning filter, an ultrafiltration device and an ultrafiltration water production tank which are sequentially connected through pipelines;
the deep processing system comprises: the system comprises a booster pump, a cartridge filter I, a high-pressure pump, a reverse osmosis device and an RO water production tank which are sequentially connected through pipelines;
the ultrafiltration water production tank is connected with the booster pump through a pipeline.
The invention has the beneficial effects that: the quartz sand and activated carbon filter can remove partial suspended matters, colloid and other impurities in water, and the impurities are intercepted by the filter, so that the loads of ultrafiltration and reverse osmosis are reduced, and the normal operation of subsequent equipment is ensured. The quartz sand filter and the activated carbon filter system are provided with backwashing and gas washing, the backwashing water is the concentrated water of the RO (reverse osmosis) system, and the concentrated water is recycled, so that the discharged wastewater amount is reduced.
The water enters an ultrafiltration device after being treated by a self-cleaning filter, and the ultrafiltration device is a solution separation device which takes an ultrafiltration membrane as a filter medium and takes the pressure difference between two sides of the membrane as a driving force. The ultrafiltration membrane only allows the solvent (such as water molecules), inorganic salt and small molecular organic matters in the solution to permeate, and retains suspended substances, colloids, proteins, microorganisms and other macromolecular substances in the solution, thereby achieving the purposes of purification and separation. The recovery rate of the ultrafiltration system is 95%, and a flow measurement filtration method is adopted. The water produced by the ultrafiltration device has SDI less than 3, turbidity less than 0.1NTU and removal rate of microorganisms, bacteria and escherichia coli of 99 percent. The ultrafiltration water is pumped into the first cartridge filter through the booster pump, the filtration precision is 5um, and the first cartridge filter can remove particles larger than 5um and prevent solid particles from damaging membrane filaments.
And then the water is pumped into a reverse osmosis device through a high-pressure pump. The reverse osmosis membrane can remove colloids, impurities, organic matters, microorganisms, various anions and cations and the like in water to generate desalted water, and the water produced by the reverse osmosis device enters the RO water production tank.
The system is simple to operate, high in automation degree, compact in structure and small in occupied area, is suitable for building large, medium and small devices, realizes recycling of reclaimed water, saves water resources and reduces water cost. The system has the advantages of good water quality of produced water, high stability, low operation cost, high automation degree, meeting the water supply requirement of a long-distance heat supply pipe network and the like. Effectively removes colloid, organic matters, microorganisms, inorganic salt ions, viruses and the like in water to generate clean desalted water for a long-distance heat supply pipe network. Under the condition of water resource shortage, the reclaimed water is used as a regeneration water source, so that the development trend is inevitable, the industrial water consumption is saved, the influence of the direct discharge of the reclaimed water on the environment is reduced, and the method has great economic, social and environmental significance.
Further, the filter material of the quartz sand filter comprises quartz sand, and the filter material of the activated carbon filter comprises activated carbon.
The beneficial effects of the further technical scheme are that: the quartz sand filter is mainly densely filled with fine quartz sand, solid particles which are insoluble in water are intercepted by blocking, the active carbon filter mainly passes through micropores with huge amount of active carbon, the micropores have strong adsorption force, can adsorb organic matters, colloid, ions and other impurities in water, and has good removal effect on residual chlorine and soluble pollutants. Double filtration works very well as a pretreatment device for the membrane.
Furthermore, the filtering precision of the self-cleaning filter is 100um.
The beneficial effects of the further technical scheme are that: the effluent of the quartz sand and the activated carbon filter enters the intermediate water tank, and the water in the intermediate water tank is lifted to the self-cleaning filter through the ultrafiltration water inlet pump, so that large particle pollutants are prevented from blocking the ultrafiltration membrane.
Further, the first filtering precision of the cartridge filter is 5um.
Further, the quartz sand filter and the activated carbon filter are made of carbon steel lining rubber, the steel plate is 6mmQ235-B, sand blasting is carried out on the inside and the outside to remove rust, and the thickness of the inner lining rubber layer is 3mm.
The beneficial effects of the further technical scheme are that: the quartz sand filter and the activated carbon filter have high mechanical strength and good corrosion resistance, and the service life of the quartz sand filter and the activated carbon filter is prolonged by 3 to 5 years compared with that of a common carbon steel filter.
Furthermore, the ultrafiltration membrane of the ultrafiltration device has a pore size of 0.03um and a tolerance PH of 2-11.
Furthermore, the ultrafiltration membrane frame of the ultrafiltration device adopts a carbon steel anti-corrosion frame, the membrane shell is made of UPVC material, and the membrane filaments are made of PVDF material.
Furthermore, the model of the single membrane of the reverse osmosis device is 8040, and the area of the single membrane is 37.2m 2 The desalination rate of a single membrane is 99.5 percent, the tolerance PH is 2-11, the membrane shell is made of glass fiber reinforced plastic, the membrane filaments are made of aromatic polyamide, and the membrane frame is made of carbon steel anti-corrosion material.
The beneficial effects of the further technical scheme are that: the recovery rate of the reverse osmosis unit was 75%.
Further, the above-mentioned reuse of reclaimed water system for long-distance transmission heat supply pipe network still includes: the auxiliary system is electrically connected with the electric control system;
the auxiliary system comprises: the RO concentrated water tank, the reverse osmosis device and the RO concentrated water tank are connected through a pipeline.
Further, the auxiliary system further includes: the RO concentrated water tank, the filter backwashing pump and the quartz sand filter are sequentially connected through a pipeline; the filter backwashing pump and the activated carbon filter are connected through a pipeline.
Further, the auxiliary system further includes: the ultrafiltration backwashing water pump, the ultrafiltration water production tank, the ultrafiltration backwashing water pump and the ultrafiltration device are sequentially connected through a pipeline.
Further, the auxiliary system further includes: the chemical cleaning water tank, the cleaning water pump, the security filter II and the reverse osmosis device are sequentially connected through a pipeline; the second cartridge filter is connected with the ultrafiltration device through a pipeline.
The beneficial effects of the further technical scheme are that: membrane fouling is a frequently encountered problem during ultrafiltration membrane filtration. The term "fouling" means a phenomenon in which a macromolecular solute such as fine particles, colloidal particles, organic substances, microorganisms, etc. in a liquid to be treated physically and chemically interacts with a membrane to cause adsorption and precipitation on the surface or in pores of the membrane to reduce or block the pores of the membrane, thereby reducing the water permeability or separation capacity of the membrane, and in this case, the membrane must be cleaned. Reverse osmosis membrane elements are subject to contamination by suspended or poorly soluble substances that may be present in the feed water, the most common of these contaminants being calcium carbonate scale, calcium sulfate scale, metal oxide scale, silicon deposits and organic or biological deposits. Therefore, the reverse osmosis apparatus is provided with a chemical cleaning apparatus.
Further, the auxiliary system further includes: the first dosing device is connected with the third dosing device through a pipeline, a pipeline for connecting the booster pump and the first cartridge filter is connected with the first dosing device through a pipeline, a pipeline for connecting the ultrafiltration water production tank and the ultrafiltration backwashing water pump is connected with the second dosing device through a pipeline, and the RO water production tank is connected with the third dosing device through a pipeline.
Further, the auxiliary system further includes: and the air compressor is connected with the ultrafiltration device through a pipeline.
Further, the auxiliary system further includes: the first Roots blower is connected with the quartz sand filter through a pipeline, and the second Roots blower is connected with the activated carbon filter through a pipeline.
The invention also provides a treatment method of the reclaimed water recycling system for the long-distance heat supply pipe network, which comprises the following steps:
(1) The reclaimed water enters a raw water tank, and the water in the raw water tank is sequentially lifted to a quartz sand filter and an activated carbon filter for filtering through a raw water pump;
(2) The effluent of the activated carbon filter enters the intermediate water tank, and the water in the intermediate water tank is lifted to the self-cleaning filter by the ultrafiltration water inlet pump;
(3) Water enters an ultrafiltration device after being treated by a self-cleaning filter, and ultrafiltration product water enters an ultrafiltration product water tank;
(4) The ultrafiltration water produced in the ultrafiltration water production tank is pumped into a first security filter by a booster pump, meanwhile, a non-oxidizing bactericide, a reducing agent and a scale inhibitor are added into a pipeline which is connected with the booster pump and the first security filter by a dosing device, and then the mixture is pumped into a reverse osmosis device by a high-pressure pump, and the concentrated water discharged by the reverse osmosis device enters an RO concentrated water tank;
(5) The quartz sand filter and the activated carbon filter are provided with backwashing and gas washing, the backwashing water is concentrated water of an RO concentrated water tank, the quartz sand filter and the activated carbon filter are backwashed through a filter backwashing pump, and the quartz sand filter and the activated carbon filter are respectively subjected to gas washing through a Roots blower I and a Roots blower II;
(6) The ultrafiltration device is provided with backwashing and air washing, naClO medicament and sodium citrate medicament are added into a pipeline which is connected with the ultrafiltration water production tank and the ultrafiltration backwashing water pump in two directions through the medicament adding device, the ultrafiltration backwashing water pump takes water from the ultrafiltration water production tank, a membrane component of the ultrafiltration device is backwashed, and the air washing is carried out on the ultrafiltration device through an air compressor;
(7) Chemical cleaning is arranged in the ultrafiltration device, and chemical cleaning water in the chemical cleaning water tank enters the ultrafiltration device through the cleaning water pump and the cartridge filter II to carry out ultrafiltration chemical cleaning;
(8) The reverse osmosis device is provided with chemical cleaning, and chemical cleaning water in the chemical cleaning water tank enters the reverse osmosis device through the cleaning water pump and the cartridge filter II to carry out reverse osmosis chemical cleaning;
(9) The residual concentrated water of the RO concentrated water tank and the concentrated water discharged by the ultrafiltration device are discharged from a wastewater main discharge port of the water chemical workshop;
(10) And the water produced by the reverse osmosis device enters an RO water production tank, and the water produced by the RO water production tank is added with a pH regulator through a third dosing device to regulate the pH value to 7-9 for a long-distance heat supply pipe network.
The invention has the beneficial effects that:
the pretreatment of the invention aims to remove various suspended matters and colloids in water so as to meet the water inlet requirement of subsequent reverse osmosis equipment. Prevent suspended impurities, microorganisms, colloidal substances, etc. from adhering toAnd (3) blocking a water flow channel of the membrane element on the surface of the reverse osmosis membrane or in a sewage way. Preventing poorly soluble salts, e.g. CaCO 3 、CaSO 4 、BaSO 4 、SrSO 4 、 CaF 2 Etc. are deposited on the surface of the reverse osmosis membrane, and thus the formation of these sparingly soluble salts is to be prevented. The membrane is protected against mechanical and chemical damage so that the membrane has good properties and a sufficiently long service life.
Compared with the traditional process that tap water and underground water are used as water sources, the system has the following outstanding advantages:
(1) The water cost is saved, the running cost of tap water as a water source is generally 7 yuan/ton, wherein the water cost of the tap water is 5 yuan/ton, and the running cost of per ton of water of the water treatment system is 2.7 yuan/ton.
(2) The water is the normal water of municipal water works, has reduced the emission of sewage, has reduced the holding water yield in river course, has protected peripheral environment.
(3) The produced water is desalted water, the recovery rate of the system is high and can reach 71%, the desalting rate is high and can reach 98%, the effluent quality is good, the pipeline scale formation and corrosion prevention effect is good, and the service life of the pipe network is prolonged.
(4) The system has the advantages of one-time investment, long-term return, convenient water use, simple operation, integration and modularization, high automation degree, small occupied area, simple maintenance and stable operation.
The water source of the system is reclaimed water treated by a municipal sewage plant, and the quality of the reclaimed water meets the first-class A standard of GB18918-2002 discharge Standard of pollutants for municipal Sewage treatment plants. After the treatment of the recycled water treatment system, the quality of the discharged water meets the standard of' design code for urban heating network (CJJ 34-2010), the desalination rate is 98%, the system recovery rate is 71%, the hardness is less than or equal to 0.6mmol/L, the suspended matters are less than or equal to 5mg/L, the PH is 7-9, and the discharged water can reach the standard and can be completely used for a long-distance heating network.
In view of the advantages, the reclaimed water recycling system for the long-distance heat supply pipe network has good economic benefit, social benefit and environmental protection benefit.
The wide application of the reclaimed water recycling process has great significance for improving the environment and saving water resources, realizes the recycling of the water resources, changes waste into valuable and improves the comprehensive benefits of urban water resources.
Further, in the step (1), the design pressure of the quartz sand filter and the activated carbon filter is 0.6Mpa, the operation temperature is 5-50 ℃, and the operation flow rate is 10m/h.
Further, in the step (3), the operating temperature of the ultrafiltration device is 5-40 ℃, and the membrane flux is 60L/(m) 2 H), the maximum water inlet pressure is 0.3Mpa.
Further, in the step (4), the water inlet pressure of the reverse osmosis device is 0.8-1.4Mpa, and the highest water inlet temperature is 45 ℃.
Further, in the step (5), the backwashing and the gas washing are performed for 24 to 72 hours.
Further, in the step (5), the strength of the gas washing is 15L/m 2 S, backwash intensity of 12L/m 2 .S。
Further, in the step (6), the maximum backwash air pressure is 0.15Mpa, and the backwash air volume is: 10Nm 3 And/or (b).
Further, in the step (6), the backwashing period is once every 40-60 min.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a reclaimed water recycling system for a long-distance heat supply pipe network according to the invention;
FIG. 2 is a schematic flow chart of a treatment method of a reclaimed water recycling system for a long-distance heat supply pipe network according to the invention;
in the figure: 1-raw water pump, 2-quartz sand filter, 3-activated carbon filter, 4-intermediate water tank, 5-ultrafiltration water inlet pump, 6-self-cleaning filter, 7-ultrafiltration device, 8-ultrafiltration water production tank, 9-booster pump, 10-cartridge filter I, 11-high pressure pump, 12-reverse osmosis device, 13-RO water production tank, 14-RO concentrated water tank, 15-filter reverse washing pump, 16-ultrafiltration reverse washing water pump, 17-chemical cleaning water tank, 18-cleaning water pump, 19-cartridge filter II, 20-dosing device I, 21-dosing device II, 22-dosing device III, 23-air compressor, 24-roots blower I, 25-roots blower II and 26-electrical control system.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the reclaimed water recycling system for a long-distance heat supply pipe network comprises: the pretreatment system, the advanced treatment system and the electric control system 26 are respectively electrically connected with the electric control system 26;
the pretreatment system comprises: a raw water pump 1, a quartz sand filter 2, an activated carbon filter 3, an intermediate water tank 4, an ultrafiltration water inlet pump, a self-cleaning filter 6, an ultrafiltration device 7 and an ultrafiltration water production tank 8 which are connected in sequence through pipelines;
the deep processing system comprises: the system comprises a booster pump 9, a cartridge filter I10, a high-pressure pump 11, a reverse osmosis device 12 and an RO water production tank 13 which are sequentially connected through pipelines;
the ultrafiltration water production tank 8 is connected with a booster pump 9 through a pipeline.
In one embodiment, the self-cleaning filter 6 has a filtration accuracy of 100um.
In one embodiment, the cartridge filter-10 has a filter fineness of 5um.
In one embodiment, the quartz sand filter 2 and the activated carbon filter 3 are made of carbon steel lining rubber, the steel plate is 6mmQ235-B, sand blasting is carried out on the inside and the outside to remove rust, and the thickness of the inner lining rubber layer is 3mm.
In one embodiment, the ultrafiltration membrane of the ultrafiltration device 7 has a pore size of 0.03um and is resistant to a pH of 2 to 11.
In one embodiment, the ultrafiltration membrane frame of the ultrafiltration device 7 is a carbon steel anticorrosion frame, the membrane shell is made of UPVC material, and the membrane filaments are made of PVDF material.
In one embodiment, the reverse osmosis unit 12 has a single membrane model of 8040 and a single membrane area of 37.2m 2 The desalination rate of a single membrane is 99.5 percent, the tolerance PH is 2-11, the membrane shell is made of glass fiber reinforced plastic, the membrane filaments are made of aromatic polyamide, and the membrane frame is made of carbon steel anti-corrosion material.
In one embodiment, the filter material of quartz sand filter 2 comprises quartz sand and the filter material of activated carbon filter 3 comprises activated carbon.
In one embodiment, the reclaimed water recycling system for a long-distance heat supply pipe network further comprises: the auxiliary system, the electrical control system 26 is electrically connected with the auxiliary system;
the assistance system includes: the RO concentrate tank 14, the reverse osmosis apparatus 12 and the RO concentrate tank 14 are connected by piping.
In one embodiment, the assistance system further comprises: the filter backwashing pump 15, the RO concentrated water tank 14, the filter backwashing pump 15 and the quartz sand filter 2 are connected in sequence through pipelines; the filter backwashing pump 15 and the activated carbon filter 3 are connected by a pipe.
In one embodiment, the assistance system further comprises: an ultrafiltration backwashing water pump 16, an ultrafiltration water production tank 8, an ultrafiltration backwashing water pump 16 and an ultrafiltration device 7 are connected in sequence through pipelines.
In one embodiment, the assistance system further comprises: the chemical cleaning water tank 17, the cleaning water pump 18 and the cartridge filter II 19 are sequentially connected with the reverse osmosis device 12 through pipelines; the second cartridge filter 19 is connected with the ultrafiltration device 7 through a pipeline.
In one embodiment, the assistance system further comprises: the first dosing device 20 is connected with the third dosing device 22 through a pipeline, a pipeline connecting the booster pump 9 with the first cartridge filter 10 is connected with the first dosing device 20 through a pipeline, a pipeline connecting the ultrafiltration water production tank 8 with the ultrafiltration backwashing water pump 16 is connected with the second dosing device 21 through a pipeline, and the RO water production tank 13 is connected with the third dosing device 22 through a pipeline.
In one embodiment, the assistance system further comprises: and the air compressor 23, the air compressor 23 and the ultrafiltration device 7 are connected through pipelines.
In one embodiment, the assistance system further comprises: the first roots blower 24 is connected with the quartz sand filter 2 through a pipeline, and the second roots blower 25 is connected with the activated carbon filter 3 through a pipeline.
As shown in fig. 2, the treatment method for the reclaimed water reuse system of the long-distance heat supply pipe network comprises the following steps:
(1) The reclaimed water enters a raw water tank, the water in the raw water tank is sequentially lifted to a quartz sand filter 2 and an activated carbon filter 3 for filtration through a raw water pump 1, the design pressure of the quartz sand filter 2 and the activated carbon filter 3 is 0.6Mpa, the operation temperature is 5-50 ℃, and the operation flow rate is 10m/h;
(2) The effluent of the activated carbon filter 3 enters the intermediate water tank 4, and the water in the intermediate water tank 4 is lifted to the self-cleaning filter 6 through the ultrafiltration water inlet pump;
(3) The water enters an ultrafiltration device 7 after being treated by a self-cleaning filter 6, the ultrafiltration product water enters an ultrafiltration product water tank 8, the operating temperature of the ultrafiltration device 7 is 5-40 ℃, and the membrane flux is 60L/(m) 2 H), the maximum water inlet pressure is 0.3Mpa;
(4) Pumping ultrafiltration product water in an ultrafiltration product water tank 8 into a cartridge filter I10 through a booster pump 9, simultaneously adding a non-oxidizing bactericide, a reducing agent and a scale inhibitor into a pipeline connecting the booster pump 9 and the cartridge filter I10 through a first dosing device I20, pumping the mixture into a reverse osmosis device 12 through a high-pressure pump 11, feeding concentrated water discharged by the reverse osmosis device 12 into an RO concentrated water tank 14, wherein the water inlet pressure of the reverse osmosis device 12 is 0.8-1.4Mpa, and the highest water inlet temperature is 45 ℃;
(5) The quartz sand filter 2 and the activated carbon filter 3 are provided with backwashing and gas washing, the backwashing water is concentrated water of an RO concentrated water tank 14, the quartz sand filter 2 and the activated carbon filter 3 are backwashed through a filter backwashing pump 15, the quartz sand filter 2 and the activated carbon filter 3 are respectively gas washed through a Roots blower I24 and a Roots blower II 25, the backwashing and gas washing periods are once every 24-72 hours, and the gas washing strength is 15L/m 2 S, backwash intensity of 12L/m 2 .S；
(6) Ultrafiltration device 7 sets up backwash and gas washing, adds NaClO medicament and sodium citrate medicament in connecting the pipeline that ultrafiltration produced water tank 8 and ultrafiltration backwash water pump 16 through charge device two 21, and ultrafiltration backwash water pump 16 is from water intaking in the ultrafiltration production water tank 8, carries out the backwash to the membrane module of ultrafiltration device 7, carries out the gas washing to ultrafiltration device 7 through air compressor machine 23, and the biggest backwash atmospheric pressure is 0.15Mpa, and the backwash tolerance is: 10Nm 3 The backwashing period is once every 40-60 min;
(7) Chemical cleaning is arranged in the ultrafiltration device 7, and chemical cleaning water in the chemical cleaning water tank 17 enters the ultrafiltration device 7 through the cleaning water pump 18 and the cartridge filter II 19 to carry out ultrafiltration chemical cleaning;
(8) The reverse osmosis device 12 is provided with chemical cleaning, and chemical cleaning water in a chemical cleaning water tank 17 enters the reverse osmosis device 12 through a cleaning water pump 18 and a cartridge filter II 19 to carry out reverse osmosis chemical cleaning;
(9) The residual concentrated water of the RO concentrated water tank 14 and the concentrated water discharged by the ultrafiltration device 7 are discharged from a total wastewater discharge port of the water chemical plant;
(10) The water produced by the reverse osmosis device 12 enters an RO water production tank 13, and the water in the RO water production tank 13 is added with a pH regulator through a third chemical adding device 22 to adjust the pH value to 7-9 for supplying to a long-distance heat supply pipe network.
Example 1
(1) The reclaimed water enters a raw water pool, and the effective volume of the raw water pool is 500m 3 The total retention time of the raw water is ensured to be more than or equal to 1 hour, the structure of the raw water pool is a reinforced concrete structure, and the interior of the raw water pool is subjected to anticorrosion treatment.
(2) The water in the raw water pool is lifted to a quartz sand filter 2 and an activated carbon filter 3 in sequence through a raw water pump 1 for filtering. The flow rate of the raw water pump 1 is: 250m 3 The pump has the following characteristics that the pump lift is 36m, the number of the pumps is 3, 1 standby pump is used for 2, and the standby pump is started after the operating water pump fails. The single-tank treatment capacity of the quartz sand filter 2 is as follows: 100m 3 The maximum pressure bearing of the tank body is 0.6Mpa, the operating pressure is 0.3Mpa, the operating temperature is 15 ℃, the filtration speed is 10m/h, the diameter of a single tank is 3.6m, the height is 4.5m, and the number of the tanks is 5. Filling quartz sand filter material with a height of 1200mm and lower quartz sand particles of 3-5%mm, the filling height is 600mm, the upper quartz sand particles are 1-3mm, and the filling height is 600mm. The quartz sand effluent enters an active carbon filter.
(3) The single pot throughput of the activated carbon filter 3 was: 100m 3 The maximum pressure bearing of the tank body is 0.6Mpa, the operating pressure is 0.3Mpa, the operating temperature is 15 ℃, the filtration speed is 10m/h, the diameter of a single tank is 3.6m, the height is 4.5m, and the number of the tanks is 5. The quartz sand filter material is filled in the quartz sand filter material, the filling height is 1200mm, the lower quartz sand particles are 2-4mm, the filling height is 600mm, the upper activated carbon particles are 1-2mm, and the filling height is 600mm.
(4) The effluent of the activated carbon filter 3 enters the middle water tank 4, the effective volume of the middle water tank 4 is 250m3, the middle water tank 4 is made of glass fiber reinforced plastic water tanks, and the number of the water tanks is 1. Water in the middle water tank 4 is lifted to the self-cleaning filter 6 through the ultrafiltration water inlet pump 5, and the flow of the ultrafiltration water inlet pump 5 is as follows: 250m 3 And h, the lift is 30m, the number of the lifting heads is 2, and a variable frequency motor is configured. The treatment capacity of the self-cleaning filter 6 is as follows: 250m 3 And h, the material is 304 stainless steel, and the number is 2.
(5) Water enters the ultrafiltration device 7 after being treated by the self-cleaning filter 6, the ultrafiltration device 7 is divided into two groups, and when 1 group is overhauled, the other group can normally run to continuously produce water. The membrane frame of the ultrafiltration device 7 is of a carbon steel anti-corrosion structure. The ultrafiltration membrane has water inlet pressure of 0.25Mpa, UPVC shell, PVDF filament, and external pressure membrane with area of 75 square meter and flux of 50L/m 2 H, the total number of ultrafiltration membranes is 126, and the operating temperature of the ultrafiltration device is 15 ℃.
(6) The ultrafiltration water enters the ultrafiltration water production tank 8, and the effective volume of the ultrafiltration water production tank 8 is 250m 3 The ultrafiltration water production tank 8 is made of glass fiber reinforced plastic water tanks, and the number of the ultrafiltration water production tanks is 1.
(7) The ultrafiltration water in the ultrafiltration water production tank 8 is pumped into a first cartridge filter 10 through a booster pump 9, and the flow rate of the booster pump 9 is as follows: 240m 3 H, head 32m, 2, throughput of first cartridge filter 10 is 240m 3 The material is 304 stainless steel, the big flux filter core is the PP material, and filter fineness is 5um 2. Simultaneously, the blower pump 9 and the security filter are connected in the first 20 directions of the medicine adding deviceThe non-oxidizing bactericide, the reducing agent and the scale inhibitor are added into a pipeline of the first device 10, a dosing pump of the first dosing device is a mechanical diaphragm metering pump, the flow rate is 20L/h, the pressure is 5bar, the number is 6, the dosing barrels are PE barrels, the effective volume is 500L and 3, each dosing barrel is provided with 2 metering pumps, and 1 device is used for 1. Then pumping the water into a reverse osmosis device 12 through a high-pressure pump 11, wherein the flow of the high-pressure pump 11 is 240m 3 H, a head of 130m and 2 sets of variable frequency motors, the reverse osmosis devices 12 are divided into 2 groups of reverse osmosis devices, the membrane frame is made of carbon steel anti-corrosion material, the reverse osmosis membrane adopts 8040 membrane, the membrane area is 37m 2 The total number of the reverse osmosis systems is 456 counts, the operating temperature is 15 ℃, the total recovery rate of the reverse osmosis systems is 75 percent, the water inlet pressure is 0.8MPa, the water inlet temperature is 20 ℃, and the water volume of the discharged concentrated water is 117m 3 H, the effective volume of the RO concentrated water tank 14 and the RO concentrated water tank is 100m 3 The material is glass fiber reinforced plastic material, and the quantity is 1.
(8) The quartz sand filter 2 and the activated carbon filter 3 are provided with backwashing and gas washing, the backwashing water is concentrated water of an RO concentrated water tank 14, the quartz sand filter 2 and the activated carbon filter 3 are backwashed through a filter backwashing pump 15, the quartz sand filter 2 and the activated carbon filter 3 are respectively gas washed through a Roots blower I24 and a Roots blower II 25, the backwashing and gas washing periods are all 1 time per 48 hours, the gas washing strength is 15L/m2.S, and the backwashing strength is 12L/m 2 S; the flow rate of the filter backwash pump 15 is: 380m 3 H, lift 25m, 2, 1 is used and 1 is prepared. The air quantity passing through the first Roots blower 24 and the second Roots blower 25 is as follows: 10.17L/S, 78KPa pressure, 2 stations, which are mutually standby.
(9) The ultrafiltration device 7 is provided with backwashing and air washing, naClO medicament and sodium citrate medicament are added into a pipeline of an ultrafiltration backwashing water pump 16 through a second medicine adding device 21, the flow of the second medicine adding device is 1500L/h, the pressure is 5bar, the quantity is 4, the medicine adding barrels are PE barrels, the effective volume is 3000L,2 medicine adding barrels are provided with 2 metering pumps, and 1 medicine adding barrel is provided with 1. The ultrafiltration backwash water pump 16 takes water from the ultrafiltration water production tank 8, backwashes the membrane component of the ultrafiltration device 7, performs gas washing on the ultrafiltration device 7 through the air compressor 23, the maximum backwash air pressure is 0.15Mpa, and the backwash air volume is: 10Nm 3 The number of the branches is one,the backwash cycle is every 40 min.
(10) The ultrafiltration device 7 and the reverse osmosis device 12 share 1 set of chemical cleaning system, the period of the chemical cleaning is 6 months and 1 time, and the chemical cleaning is determined according to the pollution condition of the membrane. Chemical cleaning water in the chemical cleaning water tank 17 enters the ultrafiltration device 7 through the cleaning water pump 18 and the cartridge filter II 19 for ultrafiltration chemical cleaning; the effective volume of the chemical cleaning water tank 17 is 13m 3 The material is PE, and the number is 1. The flow rate of the cleaning water pump 18 is 260m 3 The head is 32m, and the number is 1. The throughput of the second cartridge filter 19 is 260m3/h, the material is 304 stainless steel, the high-flux filter element is PP material, the filtering precision is 5um, and the number of the second cartridge filter is 1.
(11) The chemical cleaning and the ultrafiltration chemical cleaning of the reverse osmosis device 12 share 1 set of chemical cleaning system, and the chemical cleaning water in the chemical cleaning water tank 17 enters the reverse osmosis device 12 through the cleaning water pump 18 and the cartridge filter II 19 for reverse osmosis chemical cleaning.
(12) The residual concentrated water of the RO concentrated water tank 14 and the concentrated water discharged from the ultrafiltration device 7 are discharged from a wastewater main discharge port of the water chemical plant.
(13) The water produced by the reverse osmosis device 12 enters an RO water production tank 13, and the water in the RO water production tank 13 is added with a pH regulator through a third chemical adding device 22 to adjust the pH value to 7-9 for supplying to a long-distance heat supply pipe network. The effective volume of the RO water production tank 13 is 500m 3 The RO water tank 13 is of a reinforced concrete structure and is internally subjected to anticorrosion treatment.
The water source of the system is reclaimed water treated by a municipal sewage plant, and the quality of the reclaimed water meets the first-class A standard of GB18918-2002 discharge Standard of pollutants for municipal Sewage treatment plants. After the treatment of the reclaimed water treatment system, the quality of the discharged water meets the standard of 'design code for urban heating network' (CJJ 34-2010), wherein the desalination rate is 98%, the system recovery rate is 71%, the hardness is 0.1mmol/L, the suspended matters are 15mg/L, the PH is 7-9, and the discharged water can reach the standard and can be completely used for a long-distance heating network.
Table 1 example 1 water in and out details
Example 2
(1) The reclaimed water enters a raw water pool, and the effective volume of the raw water pool is 300m 3 The total retention time of the raw water is ensured to be more than or equal to 1 hour, the structure of the raw water pool is a reinforced concrete structure, and the interior of the raw water pool is subjected to antiseptic treatment.
(2) The water in the raw water pool is lifted to a quartz sand filter 2 and an active carbon filter 3 in sequence through a raw water pump 1 for filtering. The flow rate of the raw water pump 1 is: 150m 3 H, the lift is 34m, the number of the lifting heads is 3, 2 units are 1, a variable frequency motor, and starting the standby water pump after the operating water pump fails. The single-tank treatment capacity of the quartz sand filter 2 is as follows: 95m 3 The maximum pressure bearing of the tank body is 0.6Mpa, the operating pressure is 0.28Mpa, the operating temperature is 20 ℃, the filtration speed is 10m/h, the diameter of a single tank is 3.5m, the height is 4.4m, and the number of the tanks is 3. The quartz sand filter material is filled in the quartz sand filter material, the filling height is 1200mm, the lower layer quartz sand particles are 3-5mm, the filling height is 800mm, the upper layer quartz sand particles are 1-3mm, and the filling height is 400mm. The quartz sand effluent enters an activated carbon filter.
(3) The single pot throughput of the activated carbon filter 3 was: 95m 3 The maximum pressure bearing of the tank body is 0.6Mpa, the operating pressure is 0.28Mpa, the operating temperature is 20 ℃, the filtration speed is 10m/h, the diameter of a single tank is 3.5m, the height is 4.4m, and the number of the tanks is 3. The quartz sand filter material is filled in the quartz sand filter material, the filling height is 1200mm, the lower quartz sand particles are 2-4mm, the filling height is 800mm, the upper activated carbon particles are 1-2mm, and the filling height is 400mm.
(4) The effluent of the activated carbon filter 3 enters an intermediate water tank 4, the effective volume of the intermediate water tank 4 is 150m < 3 >, and the intermediate water tank 4 is made of 1 stainless steel water tank. Water in the middle water tank 4 is lifted to the self-cleaning filter 6 through the ultrafiltration water inlet pump 5, and the flow of the ultrafiltration water inlet pump 5 is as follows: 150m 3 And h, the lift is 30m, the number of the lifting heads is 2, and variable frequency motors are arranged. The treatment capacity of the self-cleaning filter 6 is as follows: 150m 3 H, the material is 304 stainless steel, numberThe amount was 2 stages.
(5) Water enters the ultrafiltration device 7 after being treated by the self-cleaning filter 6, the ultrafiltration device 7 is divided into two groups, and when 1 group is overhauled, the other group can normally run to continuously produce water. The membrane frame of the ultrafiltration device 7 is of a carbon steel anti-corrosion structure. The water inlet pressure of the ultrafiltration membrane is 0.25Mpa, the ultrafiltration membrane shell is made of UPVC (unplasticized polyvinyl chloride), the ultrafiltration membrane filaments are made of PVDF (polyvinylidene fluoride), the area of the ultrafiltration membrane is a 75-square meter of external pressure membrane, the membrane flux is 50L/m < 2 > h, the total number of the ultrafiltration membranes is 74, and the operating temperature of the ultrafiltration device is 20 ℃.
(6) The ultrafiltration water enters an ultrafiltration water production tank 8, the effective volume of the ultrafiltration water production tank 8 is 150m < 3 >, the ultrafiltration water production tank 8 is made of stainless steel water tanks, and the number of the ultrafiltration water production tanks is 1.
(7) The ultrafiltration water in the ultrafiltration water production tank 8 is pumped into a first cartridge filter 10 through a booster pump 9, and the flow rate of the booster pump 9 is as follows: 135m 3 H, the head is 32m, the number of the filter units is 2, and the treatment capacity of the first cartridge filter 10 is 135m 3 The material is 304 stainless steel, the big flux filter core is the PP material, and filter fineness is 5um 2. And simultaneously, adding a non-oxidative bactericide, a reducing agent and a scale inhibitor into a pipeline which is connected with a booster pump 9 and a cartridge filter I10 through a first dosing device 20, wherein a dosing pump of the first dosing device is a mechanical diaphragm metering pump, the flow rate is 15L/h, the pressure is 5bar, the number of the dosing pumps is 6, dosing barrels are PE barrels, the effective volume is 300L,3 dosing barrels are provided with 2 metering pumps, and 1 is used for 1. Then pumping the water into a reverse osmosis device 12 through a high-pressure pump 11, wherein the flow of the high-pressure pump 11 is 135m 3 H, the lift is 130m, the number is 2, the variable frequency motor is configured, the reverse osmosis device 12 is divided into 2 groups of reverse osmosis devices, the membrane frame is made of carbon steel anti-corrosion material, the reverse osmosis membrane adopts 8040 membrane, the membrane area is 37m 2 288 total reverse osmosis systems, the total recovery rate of the reverse osmosis system is 75 percent, the water inlet pressure is 0.75MPa, the water inlet temperature is 20 ℃, the water quantity of the discharged concentrated water is 67m < 3 >/h, the concentrated water enters an RO concentrated water tank 14, the effective volume of the RO concentrated water tank is 80m 3 The material is stainless steel material, quantity 1.
(8) The quartz sand filter 2 and the activated carbon filter 3 are provided with backwashing and gas washing, the backwashing water takes the concentrated water of the RO concentrated water tank 14, and the concentrated water enters the quartz sand filter 2 and the activated carbon filter 3 through the filter backwashing pump 15Performing backwashing, respectively performing air washing on the quartz sand filter 2 and the activated carbon filter 3 through a Roots blower I24 and a Roots blower II 25, wherein the backwashing and air washing periods are respectively 1 time per 48 hours, and the air washing strength is 15L/m 2 S, backwash intensity of 12L/m 2 S; the flow rate of the filter backwash pump 15 is: 360m 3 The delivery lift is 25m, the number of the delivery pumps is 2, and 1 is used for preparation. The air volume passing through the first Roots blower 24 and the second Roots blower 25 is as follows: 9.66L/S, 78KPa, 2 pieces in number, which are mutually standby.
(9) The ultrafiltration device 7 is provided with backwashing and air washing, naClO medicament and sodium citrate medicament are added into a pipeline of an ultrafiltration backwashing water pump 16 through a second dosing device 21, the flow of the second dosing device is 1000L/h, the pressure is 5bar, the quantity is 4, the dosing barrels are PE barrels, the effective volume is 2000L,2 dosing barrels are arranged, each dosing barrel is provided with 2 metering pumps, and 1 dosing barrel is used for 1. The ultrafiltration backwash water pump 16 takes water from the ultrafiltration water production tank 8, backwashes the membrane component of the ultrafiltration device 7, performs gas washing on the ultrafiltration device 7 through the air compressor 23, the maximum backwash air pressure is 0.15Mpa, and the backwash air volume is: 10Nm 3 And/branch, the backwashing period is once every 50 min.
(10) The ultrafiltration device 7 and the reverse osmosis device 12 share 1 set of chemical cleaning system, the period of the chemical cleaning is 8 months and 1 time, and the chemical cleaning is determined according to the pollution condition of the membrane. Chemical cleaning water in the chemical cleaning water tank 17 enters the ultrafiltration device 7 through the cleaning water pump 18 and the cartridge filter II 19 for ultrafiltration chemical cleaning; the effective volume of the chemical cleaning water tank 17 is 8m 3 The material is PE, and the number is 1. The flow rate of the cleaning water pump 18 is 160m 3 The head is 32m, and the number is 1. The throughput of the second cartridge filter 19 is 160m3/h, the material is 304 stainless steel, the high-flux filter element is PP material, the filtering precision is 5um, and the number is 1.
(11) The chemical cleaning and the ultrafiltration chemical cleaning of the reverse osmosis device 12 share 1 set of chemical cleaning system, and the chemical cleaning water in the chemical cleaning water tank 17 enters the reverse osmosis device 12 through the cleaning water pump 18 and the second cartridge filter 19 for reverse osmosis chemical cleaning.
(12) The residual concentrated water of the RO concentrated water tank 14 and the concentrated water discharged by the ultrafiltration device 7 are discharged from a total wastewater discharge port of the water chemical plant;
(13) The water produced by the reverse osmosis device 12 enters an RO water production tank 13, and the water in the RO water production tank 13 is added with a pH regulator through a third chemical adding device 22 to adjust the pH value to 7-9 for supplying to a long-distance heat supply pipe network. The effective volume of the RO water production tank 13 is 300m 3 The RO water production tank 13 is of a reinforced concrete structure, and is internally subjected to anticorrosive treatment.
This system provides the demineralized water for long distance heat supply pipe network, requires total yield to be: 200m 3 The recovery rate of the system is more than or equal to 70 percent, the desalting rate in 1 year is more than or equal to 98 percent, the hardness is less than or equal to 0.6mmol/L, and the PH is 7-9. The raw water is the effluent of a municipal sewage treatment plant, and the effluent quality meets the first-grade A standard of GB18918-2002 discharge Standard of pollutants for municipal sewage treatment plants. After the treatment of the reclaimed water treatment system, the quality of the outlet water meets the standard of design code of urban heating pipe network (CJJ 34-2010).
Table 2 example 2 water inlet and outlet detailed data
Example 3
(1) The reclaimed water enters a raw water pool, and the effective volume of the raw water pool is 150m 3 The total retention time of raw water is ensured to be more than or equal to 1 hour, and the raw water pool is made of 304 stainless steel.
(2) The water in the raw water pool is lifted to a quartz sand filter 2 and an activated carbon filter 3 in sequence through a raw water pump 1 for filtering. The flow rate of the raw water pump 1 is: 150m 3 The pump has the following characteristics that the pump lift is 34m, the number of the pumps is 2, 1 is used, and the standby water pump is started after the operating water pump fails. The single-tank treatment capacity of the quartz sand filter 2 is as follows: 75m 3 The maximum pressure bearing of the tank body is 0.6Mpa, the operating pressure is 0.30Mpa, the operating temperature is 20 ℃, the filtration speed is 10m/h, the diameter of a single tank is 3.0m, the height is 4.2m, and the number of the tanks is 2. The quartz sand filter material is filled in the quartz sand filter material, the filling height is 1200mm, the lower layer quartz sand particles are 3-5mm, the filling height is 800mm, the upper layer quartz sand particles are 1-3mm, and the filling height is 400mm. The quartz sand effluent enters an active carbon filter.
(3) Activated carbon filterThe single pot throughput of 3 was: 75m 3 The maximum pressure bearing of the tank body is 0.6Mpa, the operating pressure is 0.30Mpa, the operating temperature is 20 ℃, the filtration speed is 10m/h, the diameter of a single tank is 3.0m, the height is 4.2m, and the number of the tanks is 2. The quartz sand filter material is filled in the quartz sand filter material, the filling height is 1200mm, the lower layer quartz sand particles are 2-4mm, the filling height is 800mm, the upper layer active carbon particles are 1-2mm, and the filling height is 400mm.
(4) The effluent of the activated carbon filter 3 enters an intermediate water tank 4, the effective volume of the intermediate water tank 4 is 75m3, and the intermediate water tank 4 is made of stainless steel water tanks, and the number of the water tanks is 1. The water in the middle water tank 4 is lifted to the self-cleaning filter 6 through the ultrafiltration water inlet pump 5, and the flow of the ultrafiltration water inlet pump 5 is as follows: 75m 3 And h, the lift is 30m, the number of the lifting heads is 2, and a variable frequency motor is configured. The throughput of the self-cleaning filter 6 is: 75m 3 H, the material is 304 stainless steel, and the number is 2.
(5) Water enters an ultrafiltration device 7 after being treated by a self-cleaning filter 6, and the ultrafiltration device 7 is 1 group of devices. The membrane frame of the ultrafiltration device 7 is of a carbon steel anti-corrosion structure. The water inlet pressure of the ultrafiltration membrane is 0.25Mpa, the ultrafiltration membrane shell is made of UPVC material, the ultrafiltration membrane filaments are made of PVDF material, the area of the ultrafiltration membrane is 75 square meters of external pressure membrane, and the membrane flux is 45L/m 2 H, the total number of the ultrafiltration membranes is 42, and the operating temperature of the ultrafiltration device is 20 ℃.
(6) The ultrafiltration water enters an ultrafiltration water tank 8, and the effective volume of the ultrafiltration water tank 8 is 75m 3 The ultrafiltration water production tank 8 is made of stainless steel water tanks, and the number of the ultrafiltration water production tanks is 1.
(7) The ultrafiltration water in the ultrafiltration water production tank 8 is pumped into a first cartridge filter 10 through a booster pump 9, and the flow rate of the booster pump 9 is as follows: 75m 3 H, the head is 34m, the number of the filter units is 2, and the treatment capacity of the first cartridge filter 10 is 75m 3 And 2, the material is 304 stainless steel, the large-flux filter element is PP material, and the filtering precision is 5um. Simultaneously, a first chemical adding device (20) is used for adding a non-oxidative bactericide, a reducing agent and a scale inhibitor into a pipeline connected with a booster pump (9) and a first security filter (10), a chemical adding pump of the first chemical adding device is a mechanical diaphragm metering pump, the flow is 10L/h, the pressure is 5bar, the quantity is 6, chemical adding barrels are PE barrels, the effective volume is 200L,3 chemical adding barrels are arranged, and each chemical adding barrel is provided with a chemical adding device2 metering pumps, 1 is prepared by 1. Then the water is pumped into a reverse osmosis device 12 through a high-pressure pump 11, and the flow of the high-pressure pump 11 is 75m 3 H, lift 135m, 2 sets of variable frequency motors, 1 set of reverse osmosis devices 12, 8040 membranes adopted by the reverse osmosis membranes, and membrane area 37m 2 144 pieces in total, the total recovery rate of the reverse osmosis system is 75 percent, the water inlet pressure is 0.70MPa, the water inlet temperature is 20 ℃, the water quantity of the discharged concentrated water is 34m < 3 >/h, the concentrated water enters the RO concentrated water tank 14, the effective volume of the RO concentrated water tank is 50m 3 The material is stainless steel, and the quantity is 1.
(8) The quartz sand filter 2 and the activated carbon filter 3 are provided with backwashing and gas washing, the backwashing water is concentrated water of an RO concentrated water tank 14, the quartz sand filter 2 and the activated carbon filter 3 are backwashed through a filter backwashing pump 15, the quartz sand filter 2 and the activated carbon filter 3 are respectively gas washed through a Roots blower I24 and a Roots blower II 25, the backwashing and gas washing periods are 1 time per 48 hours, and the gas washing strength is 15L/m 2 S, backwash intensity of 12L/m 2 S; the flow rate of the filter backwash pump 15 is: 270m 3 The delivery lift is 25m, the number of the delivery pumps is 2, and 1 is used for preparation. The air quantity passing through the first Roots blower 24 and the second Roots blower 25 is as follows: 4.85L/S, 75KPa pressure, 2 stations in number, which are spare to each other.
(9) The ultrafiltration device 7 is provided with backwashing and air washing, naClO medicament and sodium citrate medicament are added into a pipeline of an ultrafiltration backwashing water pump 16 through a second dosing device 21, the flow of the second dosing device is 500L/h, the pressure is 5bar, the number is 4, the dosing barrels are PE barrels, the effective volume is 1000L,2 dosing barrels are provided with 2 metering pumps, and 1 is used for 1. The ultrafiltration backwash water pump 16 takes water from the ultrafiltration water production tank 8, backwashes the membrane component of the ultrafiltration device 7, performs gas washing on the ultrafiltration device 7 through the air compressor 23, the maximum backwash air pressure is 0.15Mpa, and the backwash air volume is: 11Nm 3 And/branch, the backwashing period is once every 45 min.
(10) The ultrafiltration device 7 and the reverse osmosis device 12 share 1 set of chemical cleaning system, the period of chemical cleaning is 5 months and 1 time, and the chemical cleaning is determined according to the membrane pollution condition. The chemical cleaning water in the chemical cleaning water tank 17 passes through a cleaning water pump 18 and a security guardThe second filter 19 enters the ultrafiltration device 7 for ultrafiltration chemical cleaning; the effective volume of the chemical cleaning water tank 17 is 8m 3 The material is PE, and the number of the PE is 1. The flow rate of the cleaning water pump 18 is 160m3/h, the head is 32m, and the number of the cleaning water pumps is 1. The throughput of the second cartridge filter 19 is 160m3/h, the material is 304 stainless steel, the high-flux filter element is PP material, the filtering precision is 5um, and the number is 1.
(11) The chemical cleaning and the ultrafiltration chemical cleaning of the reverse osmosis device 12 share 1 set of chemical cleaning system, and the chemical cleaning water in the chemical cleaning water tank 17 enters the reverse osmosis device 12 through the cleaning water pump 18 and the cartridge filter II 19 for reverse osmosis chemical cleaning.
(12) The residual concentrated water of the RO concentrated water tank 14 and the concentrated water discharged from the ultrafiltration device 7 are discharged from a wastewater main discharge port of the water chemical workshop.
(13) The water produced by the reverse osmosis device 12 enters an RO water production tank 13, and the water in the RO water production tank 13 is added with a pH regulator through a third chemical adding device 22 to adjust the pH value to 7-9 for supplying to a long-distance heat supply pipe network. The effective volume of the RO water production tank 13 is 100m 3 The RO water tank 13 is made of 304 stainless steel.
This system is long defeated heat supply pipe network moisturizing, adopts the normal water that municipal sewage treatment plant produced as the water source, produces the water requirement: the total water yield is 100m 3 The recovery rate of the system is more than or equal to 70 percent, the desalination rate in 1 year is more than or equal to 97 percent, the hardness is less than or equal to 0.6mmol/L, and the PH is 7-9. The raw water is the effluent of an urban sewage treatment plant, and the effluent quality meets the first-class A standard of GB18918-2002 discharge Standard of pollutants for urban sewage treatment plants. After the treatment of the reclaimed water treatment system, the quality of the outlet water meets the standard of design code of urban heating pipe network (CJJ 34-2010).
Table 3 example 3 water in and out details data
The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A reclaimed water recycling system for a long-distance heat supply pipe network is characterized by comprising: the system comprises a pretreatment system, a deep treatment system and an electrical control system, wherein the pretreatment system and the deep treatment system are respectively and electrically connected with the electrical control system;
the pretreatment system comprises: a raw water pump, a quartz sand filter, an active carbon filter, an intermediate water tank, an ultrafiltration water inlet pump, a self-cleaning filter, an ultrafiltration device and an ultrafiltration water production tank which are sequentially connected through pipelines;
the deep processing system comprises: the system comprises a booster pump, a cartridge filter I, a high-pressure pump, a reverse osmosis device and an RO water production tank which are sequentially connected through pipelines;
the ultrafiltration water production tank is connected with the booster pump through a pipeline.
2. The method as claimed in claim 1, wherein the filter material of the quartz sand filter comprises quartz sand, and the filter material of the activated carbon filter comprises activated carbon.
3. The reclaimed water recycling system for a long-distance heat supply pipe network according to claim 1, further comprising: the auxiliary system is electrically connected with the electrical control system;
the assistance system includes: and the RO concentrated water tank is connected with the RO concentrated water tank through a pipeline.
4. The system of claim 3, wherein the auxiliary system further comprises: the RO concentrated water tank, the filter backwashing pump and the quartz sand filter are sequentially connected through a pipeline; the filter backwashing pump and the activated carbon filter are connected through a pipeline.
5. The reclaimed water recycling system for a long-distance heat supply pipe network according to claim 1, wherein the auxiliary system further comprises: and the ultrafiltration water production tank, the ultrafiltration backwashing water pump and the ultrafiltration device are sequentially connected through a pipeline.
6. The system of claim 1, wherein the auxiliary system further comprises: the chemical cleaning water tank, the cleaning water pump, the security filter II and the reverse osmosis device are sequentially connected through pipelines; the second cartridge filter is connected with the ultrafiltration device through a pipeline.
7. The system of claim 1, wherein the auxiliary system further comprises: the first dosing device to the third dosing device are connected through a pipeline, a pipeline connecting the booster pump and the first cartridge filter is connected with the first dosing device through a pipeline, a pipeline connecting the ultrafiltration water production tank and the ultrafiltration backwashing water pump is connected with the second dosing device through a pipeline, and the RO water production tank is connected with the third dosing device through a pipeline.
8. The reclaimed water recycling system for a long-distance heat supply pipe network according to claim 1, wherein the auxiliary system further comprises: and the air compressor is connected with the ultrafiltration device through a pipeline.
9. The system of claim 1, wherein the auxiliary system further comprises: the system comprises a Roots blower I and a Roots blower II, wherein the Roots blower I is connected with a quartz sand filter through a pipeline, and the Roots blower II is connected with an active carbon filter through a pipeline.
10. A method for treating a reclaimed water reuse system for a long-distance heat supply pipe network according to any one of claims 1 to 9, comprising the following steps:
(1) The reclaimed water enters a raw water tank, and the water in the raw water tank is sequentially lifted to a quartz sand filter and an activated carbon filter for filtering through a raw water pump;
(2) The effluent of the activated carbon filter enters an intermediate water tank, and the water in the intermediate water tank is lifted to the self-cleaning filter through an ultrafiltration water inlet pump;
(3) Water enters an ultrafiltration device after being treated by a self-cleaning filter, and ultrafiltration water enters an ultrafiltration water production tank;
(4) The ultrafiltration water produced in the ultrafiltration water production tank is pumped into a first security filter by a booster pump, meanwhile, a non-oxidizing bactericide, a reducing agent and a scale inhibitor are added into a pipeline which is connected with the booster pump and the first security filter by a dosing device, and then the mixture is pumped into a reverse osmosis device by a high-pressure pump, and the concentrated water discharged by the reverse osmosis device enters an RO concentrated water tank;
(5) The quartz sand filter and the activated carbon filter are provided with backwashing and gas washing, the backwashing water is concentrated water of an RO concentrated water tank, the quartz sand filter and the activated carbon filter are backwashed through a filter backwashing pump, and the quartz sand filter and the activated carbon filter are respectively subjected to gas washing through a Roots blower I and a Roots blower II;
(6) The ultrafiltration device is provided with backwashing and gas washing, naClO medicament and sodium citrate medicament are added into a pipeline which is connected with an ultrafiltration water production tank and an ultrafiltration backwashing water pump through a medicament adding device in two directions, the ultrafiltration backwashing water pump takes water from the ultrafiltration water production tank, a membrane component of the ultrafiltration device is backwashed, and the gas washing is carried out on the ultrafiltration device through an air compressor;
(7) Chemical cleaning is arranged in the ultrafiltration device, and chemical cleaning water in the chemical cleaning water tank enters the ultrafiltration device through the cleaning water pump and the cartridge filter II to carry out ultrafiltration chemical cleaning;
(8) The reverse osmosis device is provided with chemical cleaning, and chemical cleaning water in the chemical cleaning water tank enters the reverse osmosis device through the cleaning water pump and the cartridge filter II to carry out reverse osmosis chemical cleaning;
(9) The residual concentrated water of the RO concentrated water tank and the concentrated water discharged by the ultrafiltration device are discharged from a wastewater main discharge port of the water chemical workshop;
(10) And the water produced by the reverse osmosis device enters an RO water production tank, and the water produced by the RO water production tank is added with a pH regulator through a third dosing device to regulate the pH value to 7-9 for a long-distance heat supply pipe network.
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