CN115448457A - Rural domestic sewage treatment system based on farmland irrigation water quality requirement - Google Patents
Rural domestic sewage treatment system based on farmland irrigation water quality requirement Download PDFInfo
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- CN115448457A CN115448457A CN202211040096.5A CN202211040096A CN115448457A CN 115448457 A CN115448457 A CN 115448457A CN 202211040096 A CN202211040096 A CN 202211040096A CN 115448457 A CN115448457 A CN 115448457A
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
- H02S10/12—Hybrid wind-PV energy systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F2003/008—Biological treatment of water, waste water, or sewage using anaerobic baffled reactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a rural domestic sewage treatment system based on farmland irrigation water quality requirements, which comprises: the device comprises a power supply device, a sewage treatment device and a load device; the power supply device includes: solar energy equipment, wind energy equipment and storage batteries; the sewage treatment device comprises: the device comprises a regulating tank, a first-stage anaerobic tank, a first-stage aerobic tank, a second-stage anaerobic tank, a second-stage aerobic tank and a sedimentation tank which are arranged in sequence; the effective volume ratio of the first-stage anaerobic tank to the first-stage aerobic tank is (1.0-1.3): 1, the effective volume ratio of the second-stage anaerobic tank to the second-stage aerobic tank is (1.8-2.1): 1. the system reduces the loss of available nutrient elements such as N, P in the effluent as much as possible on the premise of removing indexes such as COD (chemical oxygen demand), and is beneficial to the absorption and utilization of the nutrient elements by crops; the power supply device adopts a power supply device combining solar energy and wind energy, reduces the dependence of the sewage treatment system on conventional commercial power energy, and improves the stability, reliability and economy of system operation.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a rural domestic sewage treatment system based on the water quality requirement of farmland irrigation.
Background
The quality of the water environment directly influences the living comfort of residents, and sewage treatment is a necessary link of the life of urban residents. For rural areas, sewage treatment is always a difficult problem in the field of water treatment. The rural domestic sewage mainly comprises toilet sewage, kitchen sewage and the like, wherein the sewage contains a large amount of organic and inorganic pollutants, pathogenic microorganisms and the like, and the concentrations of nitrogen, phosphorus and COD are high. In many rural areas, sewage is discharged into river channels at will, which causes pollution of the river channels and seriously affects the normal lives of surrounding residents. In recent years, with the improvement of the living standard of people and the improvement of the consciousness of environmental protection, the treatment of rural domestic sewage is an important work at present.
Traditional rural sewage treatment plant is when handling sewage, mostly all is to sewage deposit the back, and the water after will depositing passes through the white cloth and carries out filtration treatment to it, and the filter effect is not good. Therefore, in the related art, there is also a method for treating rural sewage by using a town sewage treatment mode, for example: the A/O method and the traditional artificial wetland method are both common processes in sewage treatment, but both the methods have high energy consumption and need enough stable and high-voltage electric energy for supporting. However, some rural infrastructure is relatively backward and is difficult to meet the requirement of high energy power consumption, so that the existing sewage treatment technology is difficult to be applied in rural areas; or even if corresponding domestic sewage treatment facilities are built in rural areas, the use requirements cannot be met due to the limitation of energy consumption.
Disclosure of Invention
In order to solve or partially solve the problems in the related technology, the invention provides a rural domestic sewage treatment system based on the water quality requirement of farmland irrigation.
The invention provides a rural domestic sewage treatment system based on farmland irrigation water quality requirements, which comprises: the device comprises a power supply device, a sewage treatment device and a load device; wherein the content of the first and second substances,
the power supply device includes: the solar energy equipment and the wind energy equipment are connected with the input end of the storage battery, and the output end of the storage battery is connected with the load device through a first line;
the sewage treatment device comprises: the device comprises a regulating tank, a first-stage anaerobic tank, a first-stage aerobic tank, a second-stage anaerobic tank, a second-stage aerobic tank and a sedimentation tank which are arranged in sequence; wherein the effective volume ratio of the first-stage anaerobic tank to the first-stage aerobic tank is (1.0-1.3): 1, the effective volume ratio of the second-stage anaerobic tank to the second-stage aerobic tank is (1.8-2.1): 1.
further, the effective volume ratio of the first-stage anaerobic tank to the second-stage anaerobic tank is (0.65-0.80): 1.
Furthermore, a plurality of suspension ball fillers are arranged in the first-stage anaerobic tank, the first-stage aerobic tank, the second-stage anaerobic tank and the second-stage aerobic tank; the suspension ball filler comprises: the suspension ball is of a hollow structure, and the filler is arranged in the suspension ball; the suspension ball is made of polyurethane, and the filler is volcanic rock fragments.
Furthermore, a water inlet of the regulating tank is arranged at the upper part, a first water inlet pipe bent downwards is arranged at the water inlet, and the tail end of the first water inlet pipe is close to the bottom of the regulating tank; the water outlet of the regulating tank is arranged at the upper part and forms the water inlet of the first-stage anaerobic tank;
a second water inlet pipe bent downwards is arranged at a water inlet of the first-stage anaerobic tank; the tail end of the second water inlet pipe is close to the bottom of the first-stage anaerobic tank; the water outlet of the first-stage anaerobic tank is arranged at the upper part and forms the water inlet of the first-stage aerobic tank;
the water outlet of the first-stage aerobic tank is arranged at the lower part and forms the water inlet of the second-stage anaerobic tank.
Furthermore, a water outlet of the second-stage aerobic tank is arranged in the middle of the sedimentation tank and forms a water inlet of the sedimentation tank; the sedimentation tank is provided with the inclined plane of downward sloping in its one side that sets up the water inlet to and two adjacent sides of this face, the bottommost of sedimentation tank is provided with the mud discharge mouth.
Further, be provided with the honeycomb duct between second grade aerobic tank and the sedimentation tank, the honeycomb duct includes: the first guide pipe is arranged in the second-stage aerobic tank along the vertical direction, one end of the second guide pipe is communicated with the middle part of the first guide pipe, and the other end of the second guide pipe penetrates through the water inlet of the sedimentation tank and then is bent downwards and arranged at the lower part of the sedimentation tank.
Further, the power supply device further includes: a second circuit and a PLC control unit; one end of the second line is connected with the commercial power system, and the other end of the second line is connected with the load device; and the PLC control unit is connected with the first circuit and the second circuit and is used for controlling the on-off of the first circuit and the second circuit.
The invention also provides a method for recycling rural domestic sewage, which comprises the following steps:
collecting rural domestic sewage, and treating the rural domestic sewage by adopting any one of the rural domestic sewage treatment systems to obtain reuse water;
and using the reuse water for field irrigation.
Furthermore, the flow rate of the water flow in the sewage treatment device is set to be 61L-92L/h, and the hydraulic retention time is set to be 12 h-18 h.
Furthermore, the aeration quantity of the first-stage aerobic tank and the second-stage aerobic tank is set to be 2 mg/L-3 mg/L.
The rural domestic sewage treatment system provided by the invention has the following beneficial effects:
1) According to the characteristics of more black water, less grey water and higher COD concentration of inlet water of rural domestic water, the rural domestic sewage treatment system provided by the invention is provided with secondary A/O treatment, so that the COD can be better removed, microorganisms in the reactor can better absorb a carbon source, and the equipment size and energy consumption are reduced as much as possible.
2) The existing sewage treatment equipment is designed to operate according to the high standard level of effluent, so that the manufacturing and operating costs are very high, a large amount of capital waste is caused, and nutrient elements such as N and P in sewage are lost. From the perspective of reusing sewage in farmland irrigation, the invention properly increases the effective volume ratio of the anaerobic tank to the aerobic tank, on one hand, reduces the loss of available nutrient elements such as N, P in the effluent as much as possible on the premise of removing indexes such as COD and the like, is beneficial to the absorption and utilization of the nutrient elements by crops, and can reduce the carbon emission brought by applying chemical fertilizers to the crops; on the other hand, the effluent standard is also reduced, and the system cost and the energy consumption are reduced.
3) The power supply device combining solar energy and wind energy fully utilizes natural resources of solar energy and wind energy, realizes the complementarity of the wind energy and the wind energy in time and space, is applied to rural domestic sewage treatment devices to solve the problem of power supply energy consumption of a sewage treatment system to a certain extent, reduces the dependence of the sewage treatment system on conventional commercial power energy, and improves the stability, reliability and economy of system operation. Moreover, solar energy and wind energy belong to clean energy, so that the sewage treatment system can reduce the emission of a large amount of carbon caused by using commercial power in the traditional sewage treatment process.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 is a schematic front view of a sewage treatment plant in a rural domestic sewage treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a sewage treatment plant in a rural domestic sewage treatment system provided by an embodiment of the present invention;
FIG. 3 is a block diagram of a power supply device in a rural domestic sewage treatment system according to an embodiment of the present invention;
FIG. 4 is a graph of the dissolved oxygen concentration in different tanks during the experiment in example 1 of the present invention.
Description of the reference numerals
1-regulating reservoir
11-first water inlet pipe
2-first stage anaerobic tank
21-second water inlet pipe
3-first stage aerobic tank
4-second-stage anaerobic tank
5-second-stage aerobic tank
6-sedimentation tank
61-honeycomb duct
62-mud discharge port
7-suspension ball filler
81-aeration plate
82-air tube
91-solar plant
92 wind energy installation
93-accumulator
941-first line
942-second line
95-PLC control unit
951-solar radiation intensity sensor
952-wind speed sensor
953-Voltage sensor
954-controller
10-load device
11-mains supply system
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, 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.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The inventors of the present application consider: the rural domestic sewage is rich in a large amount of nutrient components required by various plants such as nitrogen, phosphorus and potassium, rich in organic matter suspended matters and free of toxic and harmful substances such as heavy metals. According to the characteristic of rural domestic sewage, the method is applied to agricultural irrigation water, so that waste can be changed into valuable, environmental pollution can be avoided, and the sewage treatment cost can be greatly reduced. But the long-term direct use of sewage irrigation can cause the problems of soil hardening and the like, so that the environmental risk of sewage irrigation can be effectively reduced by properly treating rural domestic sewage and then irrigating farmlands. In addition, the reuse water also has economic benefits of saving fertilizer, promoting crop growth and the like, so that the irrigation after the domestic sewage treatment has great application potential.
For a specific sewage treatment method, the inventor considers that the method is improved on the basis of the traditional A/O method, and the A/O method has a compact structure and high efficiency and can adjust the removal rate of elements such as nitrogen, phosphorus and the like.
For the energy consumption problem of sewage treatment, the inventor further considers that natural energy is adopted to reduce the dependence on electric energy, so as to reduce the difficulty of application and improve the practical operability. Solar energy is a natural energy source, and has the advantages of inexhaustibility, wide distribution, cleanness, safety and the like, so that the solar energy has great development potential. In China, the areas where solar energy can be utilized are more, wherein the areas with the highest utilization potential are the west part, the middle part and the north part of the Qinghai plateau, the large part of the Qinghai, the north part of Gansu, the east part of Sinkiang and the middle and west part of inner Mongolia, and then the middle part and the east part of inner Mongolia, the west part of the three provinces of the northeast China, the north part of Hebei, the north part of Ningxia, the middle part of Gansu, the east part and the south part of Qinghai, the west part of Sichuan and the local part of Tibet; in addition, the potential of solar energy development is good at the northeast and the north of the northeast region, the north of the North China plain, the large part of the loess plateau, the southeast edge of the Qinghai-Tibet plateau, the large part of the Yunnan, the Heizhou peninsula and the Hainan island, and the north of Xinjiang. Although solar energy has the above-mentioned advantages, it also has limitations, limited by geographical climatic conditions. Therefore, the inventor of the application further considers that other natural energy sources are introduced and are complementarily combined with solar energy, wherein wind energy is taken as a renewable energy source category and has the advantages of huge storage amount, renewability, wide distribution, no pollution and the like. In China, the wind energy resources are rich in northwest, northeast and eastern China, the existing wind power generation technology is well-developed, the wind power generation technology and the photovoltaic power generation technology are supplemented, the power generation power can be improved, and the stable operation of the load is ensured. Based on the above conception, the inventor of the present application considers that solar energy, i.e. light energy, is combined with wind energy to form wind-solar hybrid power generation, so as to realize the complementarity of the wind energy and the solar energy in time and space. Compared with the traditional single solar energy and wind energy power generation, the solar energy and wind energy power generation system overcomes the defect of discontinuity of power generation of a single energy source system, solves the problem that a large amount of energy storage equipment is needed to a certain extent, is slightly influenced by time and seasons, and improves the stability, reliability and economy of the system. The system is combined with rural domestic sewage treatment facilities, so that the dependence of the system on conventional electric energy can be reduced, the electricity cost is saved, the carbon emission is reduced, and the system has important significance on the sustainable development of the society.
In view of the above inventive concept, an embodiment of the present invention provides a rural domestic sewage treatment system based on water quality requirement of farm irrigation, comprising: the device comprises a power supply device, a sewage treatment device and a load device; wherein the content of the first and second substances,
referring to fig. 3, the power supply device includes: the solar energy device 91, the wind energy device 92 and the storage battery 93, the electrical energy output ends of the solar energy device 91 and the wind energy device 92 are connected with the input end of the storage battery 93, and the output end of the storage battery 93 is connected with the load device 10 through a first line 941;
referring to fig. 1 and 2, the sewage treatment apparatus includes: the device comprises a regulating tank 1, a first-stage anaerobic tank 2, a first-stage aerobic tank 3, a second-stage anaerobic tank 4, a second-stage aerobic tank 5 and a sedimentation tank 6 which are arranged in sequence; wherein, the effective volume ratio of the first-stage anaerobic tank 2 to the first-stage aerobic tank 3 is (1.0-1.3): 1, the effective volume ratio of the second-stage anaerobic tank 4 to the second-stage aerobic tank 5 is (1.8-2.1): 1.
after the treatment system provided by the embodiment is adopted to treat rural domestic sewage, the obtained reuse water can be directly applied to farmland irrigation, and the dependence degree on the mains supply energy is low, so that the rural domestic sewage treatment system is favorable for popularization and application in rural areas and reuse of water resources.
The rural domestic sewage treatment system comprises a power supply device, a sewage treatment device and a load device 10. Wherein, the power supply device is connected with the load device 10 and is used for providing energy electric energy for the load; the sewage treatment device that this embodiment provided guarantees on the one hand that the play water has higher ammonia nitrogen concentration and lower nitrate nitrogen concentration when degrading the organic pollutant in the sewage to more be applicable to the growth of crops.
The load device 10 is disposed in a sewage treatment device, and is used for realizing normal operation of the sewage treatment device, for example: the transmission of sewage, the operation of aeration pumps, etc. require components with the aid of electrical energy. The load device 10 may specifically include: lifting equipment and aeration equipment. The lifting equipment is used for conveying sewage, particularly conveying the sewage from a low position to a high position, and can be a lifting pump or a peristaltic pump; preferably, a peristaltic pump is adopted, and the peristaltic pump has the advantage of conveniently adjusting the flow. The aeration device can be an aeration pump or comprises the aeration pump and a rotor flow meter connected with the aeration pump; the latter is preferably adopted, and the dissolved oxygen concentration of the aerobic tank can be adjusted by adjusting the flow rate of the rotameter.
The sewage treatment device specifically comprises a regulating tank 1, a first-stage anaerobic tank 2, a first-stage aerobic tank 3, a second-stage anaerobic tank 4, a second-stage aerobic tank 5 and a sedimentation tank 6 which are arranged in sequence; wherein, the effective volume ratio of the first-stage anaerobic tank 2 to the first-stage aerobic tank 3 is (1.0-1.3): 1, the effective volume ratio of the second-stage anaerobic tank 4 to the second-stage aerobic tank 5 is (1.8-2.1): 1. the embodiment adopts two-stage A/O treatment, and simultaneously improves the effective volume ratio of the anaerobic tank to the aerobic tank compared with the existing A/O treatment technology. In this embodiment, the reason why the second-level a/O process is designed is that: the rural residents have more black water and relatively less grey water due to climate conditions and living habits, so that the COD concentration of inlet water is higher, and the COD can be better removed by setting the second-stage A/O, so that microorganisms in the reactor can better absorb a carbon source; and simultaneously, the size and the energy consumption of the equipment can be reduced as much as possible.
In the existing A/O treatment technology, an aerobic tank is generally larger than an anaerobic tank, and the effective volume ratio of the aerobic tank to the anaerobic tank is generally (1.25-1.5): 1, the nitrogen and phosphorus removal effect is better. However, for the purpose of the present application, the purpose of the domestic sewage re-treatment is to irrigate farmlands, and the inventors of the present application found through research that: generally, water rich in ammonia nitrogen is more suitable for the growth of crops, and the concentration of ammonia nitrogen in rural domestic sewage is higher, so the application hopes to reduce the loss of available nutrient elements such as N, P in effluent as much as possible on the premise of removing indexes such as COD (chemical oxygen demand), more reserve the content of ammonium nitrogen in the effluent, reduce the content of nitro nitrogen, and be beneficial to the absorption and utilization of the ammonium nitrogen by the crops. Based on the reaction mechanism of nitrification and denitrification, the invention designs a two-stage A/O integrated sewage treatment device with the effective volume of an anaerobic zone larger than that of an aerobic zone, and aims to keep the concentration of ammonia nitrogen in effluent at a higher level and lower the concentration of nitro nitrogen in the effluent. The volume ratio of the anaerobic zone is suitably increased in this embodiment mainly to remove the concentration of nitrate nitrogen by denitrification while keeping a certain amount of ammonia nitrogen. The organic nitrogen is nitrified and converted into nitrate nitrogen by nitrifying bacteria in an aerobic stage, and the nitrate nitrogen is removed in an anaerobic zone due to denitrification. Secondly, under anaerobic conditions, the growth of the phosphorus accumulating bacteria is inhibited, phosphate in cells of the phosphorus accumulating bacteria is released for the growth of the phosphorus accumulating bacteria, and energy required for the growth of the phosphorus accumulating bacteria is generated, so that the content of phosphorus in the sewage is increased. And the volume ratio of the anaerobic zone is increased, so that the phosphate absorbed by the phosphorus accumulating bacteria in the aerobic zone can be reduced, and the orthophosphate content of the final effluent is relatively high, thereby being beneficial to the absorption of phosphorus nutrients by crops. The specific design idea is as follows:
1) And a first-stage anaerobic tank 2, namely an A1 area: the microorganisms absorb the carbon source to reduce COD, meanwhile, the ammonifying bacteria convert organic nitrogen into ammonia nitrogen through ammonification, and the phosphorus accumulating bacteria release orthophosphate under anaerobic conditions. Nitrate nitrogen is reduced to some extent by denitrification.
2) And a first-stage aerobic tank 3, namely an O1 area: nitrifying by nitrifying bacteria to make NH 4 + Conversion of-N to NO 3 N, the effective volume of the area is designed to be smaller, so that the aim of converting ammonia nitrogen into nitrate nitrogen less can be fulfilled, and the ammonia nitrogen concentration in water is kept; and the phosphorus accumulating bacteria in the aerobic section begin to adsorb phosphorusThe volume of the section is reduced, so that the number of the phosphorus-accumulating bacteria is reduced.
3) And a second-stage anaerobic tank 4, namely an A2 area: the microorganisms at this stage continue to absorb COD from the water, and the effective volume at this stage is preferably set to the largest of the 4 stages. Denitrifying bacteria allow NO produced in the O1 stage 3 -N is converted to N 2 O and N 2 At this time, the water also contains NO produced in the A1 stage and not completely converted into NO by the nitrifying bacteria in the O1 stage 3 NH of-N 4 + And N, a large amount of ammonia nitrogen concentration in water is still maintained. And the phosphorus accumulating bacteria still generate the function of anaerobic phosphorus release at the stage, so that the concentration content of orthophosphate in water is increased.
4) And a second-stage aerobic tank 5, namely an O2 area: nitrification is produced, preferably designed to be minimal, ammonia nitrogen in the water is retained and the number of phosphorus accumulating bacteria is reduced, reducing the loss of orthophosphate content in the water. And at the stage, the concentration of pollutants such as COD (chemical oxygen demand) and animal and vegetable oil in water is greatly reduced after the microbial action of the previous areas.
The working process of the sewage treatment device in the embodiment is as follows:
the rural domestic sewage enters the regulating tank 1 to regulate and homogenize the water quantity and the water quality, so that the balance and stability of the water quantity and the water quality of a subsequent biochemical treatment system are ensured.
The process of hydrolyzing and breaking peptide bonds to form ammonia by organic nitrogen in water under the catalytic action of hydrolase secreted by ammoniating bacteria can be carried out in both aerobic and anaerobic environments. Ammoniation is generally fast and is usually accomplished faster than the removal of organic material. The reaction process takes amino acid as an example as follows:
RCHNH 2 COOH+O 2 →RCOOH+CO 2 +NH 3
bacteria of the clostridium in the first-stage anaerobic tank 2 and anaerobic bacteria in the clostridium can perform rapid ammoniation reaction to increase ammonia nitrogen in water.
In the first-stage aerobic tank 3, ammonia nitrogen is converted into nitrite nitrogen under the action of nitrosobacteria, the nitrite nitrogen is rapidly converted into nitrate nitrogen under the action of oxygen, the dissolved oxygen concentration at the stage is preferably 2-3 mg/L, and the reaction process is as follows:
nitrosation reaction:
nitration reaction:
the HRT is short in the stage, most ammonia nitrogen in the water is not fully subjected to nitration reaction, and the concentration of the ammonia nitrogen in the sewage entering the second-stage anaerobic tank 4 is still high. In the second-stage anaerobic tank 4, denitrifying bacteria degrade organic matters by using various organic substrates as electron donors in a denitrification process under an anoxic condition, and oxygen is used as an electron acceptor to finally realize mineralization of nitrate and convert nitrogen elements into nitrogen to be distributed to realize removal of nitrogen in water. The reaction process using methanol as donor is as follows:
reduction reaction of nitric acid:
nitrous acid reduction reaction:
and (3) total reaction:
if the organic carbon source in the first two tanks is consumed too much and the carbon source in the second-stage anaerobic tank 4 is reduced, endogenous denitrification occupies a dominant position, the microorganisms consume own protoplasm to carry out endogenous denitrification, and the reaction process is as follows:
the sewage enters the second-stage aerobic tank 5 from the second-stage anaerobic tank 4 through the water outlet, and the reaction mainly occurs in the stage that the residual organic carbon source is absorbed and degraded by aerobic bacteria to generate energy and carbon dioxide. HRT of the second-stage aerobic tank 5 is the shortest among the four biological reaction tanks, and the filler is less, so that ammonia nitrogen in water is converted into a small amount of nitrite nitrogen and nitrate nitrogen by a small amount of nitrobacteria in the tank body through molecular oxygen.
Finally, the sewage enters a sedimentation tank 6, suspended matters and aged and fallen biological membranes in the sewage are separated through the action of gravity, and the recycled water reaching the standard is discharged from the top.
In the embodiment of the invention, although the increase of the volume of the anaerobic tank is beneficial to retaining ammoniacal nitrogen and phosphorus, the excessive volume of the anaerobic tank can cause the retention time of water flow to be too long, reduce the removal effect on pollutants and cause the low removal rate of pollutants. Therefore, the effective volume ratio of the first-stage anaerobic tank 2 to the first-stage aerobic tank 3 is designed to be (1.0-1.3): 1, the effective volume ratio of the second-stage anaerobic tank 4 to the second-stage aerobic tank 5 is (1.8-2.1): 1. Therefore, the method can ensure higher pollution rate removal rate and can reserve elements such as ammoniacal nitrogen, phosphorus and the like suitable for crop production to the maximum extent. More preferably, the effective volume ratio of the first-stage anaerobic tank 2 to the first-stage aerobic tank 3 is (1.24-1.25): 1, the effective volume ratio of the second-stage anaerobic tank 4 to the second-stage aerobic tank 5 is (1.9-2): 1. for the proportion of the first-stage anaerobic tank and the second-stage anaerobic tank, a first-stage anaerobic Chi Xiaoyu second-stage anaerobic tank is preferably designed, so that mineralization of nitrate is realized, nitrogen elements are converted into nitrogen gas to be discharged, and nitrate and nitrogen in water are removed, and preferably, the effective volume ratio of the first-stage anaerobic tank 2 to the second-stage anaerobic tank 4 is (0.65-0.80): 1.
a plurality of suspension ball fillers 7 are preferably arranged in the first-stage anaerobic tank 2, the first-stage aerobic tank 3, the second-stage anaerobic tank 4 and the second-stage aerobic tank 5; the suspension ball filler 7 includes: the suspension ball is of a hollow structure, and the filler is arranged in the suspension ball; the suspension ball is made of polyurethane, and the filler is volcanic rock fragments. The volcanic filler is fast in film formation and good in pollutant removing effect, and compared with fillers such as sponge, the volcanic filler has the advantages that the volcanic filler can be directly backfilled into soil after being discarded, and environment digestion is facilitated. Furthermore, the diameter of the volcanic rock fragments is 2 cm-3 cm, the diameter of the suspended ball body is 10cm, and the suspended ball filler 7 with the size is more suitable for equipment with smaller sewage treatment scale.
The bottom of the first-stage aerobic tank 3 and the second-stage aerobic tank 5 is provided with an aeration disc 81, the aeration disc 81 preferably adopts a micropore aeration disc with the diameter of 10cm, the adoption of the micropore aeration disc is favorable for aeration bubbles to be respectively more uniform in water, and can effectively prevent the aeration head from being blocked by sludge and biological membranes in the water, and the size is smaller, so that the installation and the use of a small-scale sewage treatment device are facilitated. The aeration disc 81 is connected with an aeration pump through an air pipe 82; the aeration pump is provided with a rotor flow meter, so that the aeration quantity can be conveniently controlled. When the concentration of dissolved oxygen in the aerobic tank is too low (less than 0.5 mg/L), the activity of heterotrophic microorganisms is obviously reduced, the pollutant removal effect is poor, and when the concentration is too high, the flow state and sludge sedimentation effect in water are influenced, and nitrogen and phosphorus are greatly influenced. Therefore, as a preferable scheme of the embodiment, the aeration amount of the first-stage aerobic tank 3 and the second-stage aerobic tank 5 is controlled to be 2mg/L to 3mg/L, so that the sewage removing effect on the pollutants in the water is good while the nutrients such as nitrogen and phosphorus are retained. The number of aeration discs 81 in each aerobic tank can be selectively adjusted by a person skilled in the art according to the tank volume.
For the flow direction of the sewage in the sewage treatment device, the present embodiment is preferably set as follows:
the water inlet of the regulating tank 1 is arranged at the upper part, a first water inlet pipe 11 bent downwards is arranged at the water inlet, and the tail end of the first water inlet pipe 11 is close to the bottom of the regulating tank 1; the water outlet of the regulating tank 1 is arranged at the upper part and forms the water inlet of the first-stage anaerobic tank 2;
a second water inlet pipe 21 bent downwards is arranged at the water inlet of the first-stage anaerobic tank 2; the tail end of the second water inlet pipe 21 is close to the bottom of the first-stage anaerobic tank 2; the water outlet of the first-stage anaerobic tank 2 is arranged at the upper part and forms the water inlet of the first-stage aerobic tank 3;
the water outlet of the first-stage aerobic tank 3 is arranged at the lower part and forms the water inlet of the second-stage anaerobic tank 4.
Namely, the adjusting tank 1 adopts a water inlet mode of lower inlet and upper outlet, so that water can be more uniform and stable, and the phenomenon of cutoff can not occur. The water in the two anaerobic tanks is also in a mode of bottom-in and top-out, which is beneficial to the full contact between the sewage and the biological filler in the anaerobic tanks. The two aerobic tanks adopt an upper water inlet mode, which is favorable for full aeration.
Further, a water outlet of the second-stage aerobic tank 5 is arranged in the middle, and forms a water inlet of the sedimentation tank 6; the sedimentation tank 6 is provided with a water inlet on one side thereof, and two side surfaces adjacent to the side surface are both provided with inclined surfaces inclined downwards, and the bottommost end of the sedimentation tank 6 is provided with a sludge discharge port 62. The sedimentation tank 6 with the structure is more beneficial to sedimentation and discharge of sludge. The water outlet of the second-stage aerobic tank 5 is arranged in the middle, so that the impact on the deposited sludge in the sedimentation tank 6 can be reduced while the sewage is discharged.
Further, a flow guide pipe 61 is arranged between the second-stage aerobic tank 5 and the sedimentation tank 6, and the flow guide pipe 61 comprises: the first guide pipe is arranged in the second-stage aerobic tank 5 along the vertical direction, one end of the second guide pipe is communicated with the middle part of the first guide pipe, and the other end of the second guide pipe is bent downwards after passing through a water inlet of the sedimentation tank 6 and is arranged at the lower part of the sedimentation tank 6.
The power supply device is in a wind-solar hybrid power generation mode, converts solar energy and wind energy into electric energy and stores the electric energy in a storage battery 93 by arranging a solar device 91 and a wind device 92, and supplies the electric energy to the load device 10 when the load device needs to work. Compared with a single energy power generation mode, the power supply device provided by the embodiment can realize the complementarity of wind energy and solar energy in time and space, and can solve the problem of power supply energy consumption of a sewage treatment system to a certain extent by combining the power supply device with rural domestic sewage treatment facilities, reduce the dependence of the sewage treatment system on conventional electric energy, and improve the stability, reliability and economy of the system. For example: in the middle and western regions of Mongolia in China, sunlight is sufficient in sunny days and wind power is high in cloudy days, so that more electric energy can be stored in most climatic conditions to maintain normal operation of equipment. The rural area of the region is particularly suitable for adopting the rural domestic sewage treatment system provided by the embodiment of the invention.
Specifically, in the power supply apparatus, the solar power plant 91 includes: the photovoltaic power generation panel is connected with a photovoltaic inverter; the wind power plant 92 comprises: the wind driven generator is connected with a fan controller; the photovoltaic power generation panel and the wind driven generator are respectively used for converting light energy and wind energy into electric energy; the photovoltaic inverter and the fan controller are used for voltage conversion, and inverting the input 12/24V voltage into household 220V alternating voltage; the electrical energy outputs of the photovoltaic inverter and the fan controller are connected to the input of an accumulator 93, and the output of the accumulator 93 is connected to the load device 10, for example to the aeration device and the lifting device. The photovoltaic power generation panel preferably adopts a monocrystalline silicon solar power generation panel, and the wind driven generator preferably adopts a three-blade vertical shaft three-phase alternating current permanent magnet direct drive generator.
Further, in the case of extremely bad weather, there may be a situation that the power supply device is insufficient to store electricity, and in this case, in order to ensure that the load device 10 can still operate normally when the sewage treatment system is required to work, the power supply device of the rural domestic sewage treatment system preferably further comprises: a second line 942 and a PLC control unit 95; referring to fig. 3, one end of the second line 942 is connected to the utility power system 11, and the other end is connected to the load device 10; the PLC control unit 95 is connected to the first line 941 and the second line 942, and is configured to control on/off of the first line 941 and the second line 942.
Further, the PLC control unit 95 includes: a solar radiation intensity sensor 951, a wind speed sensor 952, a voltage sensor 953 and a controller 954;
the solar radiation intensity sensor 951 and the wind speed sensor 952 are arranged in the external environment, and the signal output ends of the solar radiation intensity sensor 951 and the wind speed sensor 952 are connected with the controller 954; the solar radiation intensity sensor 951 and the wind speed sensor 952 are respectively used for detecting the external solar radiation intensity and the wind speed and sending detected solar radiation intensity signals and wind speed signals to the controller 954;
the voltage sensor 953 is arranged on the storage battery 93, and the signal output end of the voltage sensor 953 is connected with the controller 954; the voltage sensor 953 is configured to detect a voltage of the battery 93, and send a detected voltage signal to the controller 954;
the input end of the controller 954 is connected to the solar radiation intensity sensor 951, the wind speed sensor 952 and the voltage sensor 953, and the output end is connected to the first line 941 and the second line 942; the controller 954 controls the on/off of the first and second lines 941, 942 according to the received solar radiation intensity signal, wind speed signal, and voltage signal.
The controller 954 operates as follows:
the controller 954 calculates the power generation power according to the received solar radiation intensity signal and the wind speed signal; when the generated power is higher than a preset value, controlling the path of the first line 941 and the disconnection of the second line 942;
when the generated power is smaller than the preset value, the controller 954 calculates the electric quantity of the battery 93 according to the received voltage signal, and when the electric quantity of the battery 93 is larger than the preset value, the controller controls the first line 941 to be open and the second line 942 to be open;
when the electric quantity of the battery 93 is smaller than the preset value, the second line 942 is controlled to be on, the first line 941 is disconnected, and the battery 93 is in a charging state.
In addition, the start of the controller 954 of the PLC control unit 95 may be set to start when a preset condition is met, and the aforementioned determination and execution operation may be performed after the start; the preset conditions may be: when the voltage signal is greater than the lowest threshold, the controller 954 is activated.
From the above, the rural domestic sewage treatment system provided by the embodiment of the invention has the following advantages:
1) According to the characteristics of more black water, less grey water and higher COD concentration of inlet water of rural domestic water, the rural domestic sewage treatment system provided by the invention is provided with secondary A/O treatment, so that the COD can be better removed, microorganisms in the reactor can better absorb a carbon source, and the equipment size and energy consumption are reduced as much as possible.
2) The existing sewage treatment equipment is designed to operate according to the high standard level of effluent, so that the manufacturing and operating costs are very high, a large amount of capital waste is caused, and nutrient elements such as N and P in sewage are lost. From the perspective of using the reuse water for farmland irrigation, the invention properly increases the effective volume ratio of the anaerobic tank to the aerobic tank, on one hand, the loss of available nutrient elements such as N, P in the effluent is reduced as much as possible on the premise of removing indexes such as COD and the like, thus being beneficial to the absorption and utilization of the nutrient elements by crops and reducing the carbon emission brought by applying chemical fertilizers to the crops; on the other hand, the effluent standard is also reduced, and the system cost and the energy consumption are reduced.
3) The power supply device combining solar energy and wind energy fully utilizes natural resources of solar energy and wind energy, realizes complementarity of wind energy and solar energy in time and space, is applied to rural domestic sewage treatment devices to solve the problem of power supply energy consumption of a sewage treatment system to a certain extent, reduces the dependence of the sewage treatment system on conventional commercial power energy, and improves the stability, reliability and economy of system operation. Moreover, solar energy and wind energy belong to clean energy, so that the sewage treatment system can reduce the emission of a large amount of carbon caused by using commercial power in the traditional sewage treatment process.
Another embodiment of the invention also provides a method for treating and recycling rural domestic sewage, which comprises the following steps:
collecting rural domestic sewage, and treating the rural domestic sewage by adopting the rural domestic sewage treatment system of the embodiment to obtain reuse water;
and using the reuse water for farmland irrigation.
According to the above content, the reuse water obtained by treating the rural domestic sewage by using the sewage treatment system contains ammonia nitrogen and phosphorus with higher concentration, and is beneficial to absorption and utilization of crops; therefore, the fertilizer can be used for farmland irrigation, so that the effective reuse of water resources can be realized, the fertilizing amount of crops can be reduced, and the carbon emission is reduced.
Preferably, the flow rate of water flow in the sewage treatment device is set to be 61L-92L/h, and the hydraulic retention time is set to be 12 h-18 h, so that the sewage treatment device has a good pollutant removal effect; this step can be achieved by using a peristaltic pump and by adjusting its flow rate.
In addition, the aeration amount of the first-stage aerobic tank and the second-stage aerobic tank is preferably set to be 2 mg/L-3 mg/L, so that the pollutants in water can be well removed while nitrogen, phosphorus and other nutrients are kept.
The technical scheme of the invention is further explained by combining specific examples as follows:
example 1
The region: northwest countryside of inner Mongolia
Service population: 5 to 10 households
A sewage treatment system: comprises a power supply device, a sewage treatment device and a load device;
a load device: peristaltic pump (50W-80W), aeration pump (50-100W) (with rotameter to control aeration quantity)
A power supply device: the structure is shown in fig. 3. The solar power generation system adopts a monocrystalline silicon solar power generation plate, the rated power is 300W, the size of the monocrystalline silicon battery plate is 2000 × 992 × 35mm, and the battery efficiency is 20.6%. The wind power generation system adopts a three-blade vertical shaft three-phase alternating current permanent magnet direct drive generator, the starting wind speed is 2.0m/s, the rated wind speed is 11.5m/s, the safe wind speed is 45m/s, the diameter of a wind wheel is 1.7m, the rated power is 600W, and the rated voltage is 12/24V. Each storage battery is 2V200Ah, the applicable temperature range is-15-45 ℃, and the storage batteries are connected in series for use. The PLC control unit adopts a programmable logic controller of Siemens S7-200 SMART, is used for controlling the operation of a sewage treatment system, recording the duration and the generated energy of photovoltaic power generation and wind power generation as well as the power consumption of the system, and also recording the local climate conditions including wind speed, irradiance, temperature, humidity, PM2.5, PM10 and other parameters in real time. The mode of the PLC control unit for controlling the operation of the sewage treatment system is as follows: the controller calculates the power generation power according to the received solar radiation intensity signal and the wind speed signal; when the generated power is higher than 80W, controlling the first circuit path and the second circuit to be in an open circuit; when the generated power is less than 80W, the controller calculates the electric quantity of the storage battery according to the received voltage signal, and when the electric quantity of the storage battery is more than 30%, the first circuit is controlled to be connected with a circuit, and the second circuit is disconnected; when the electric quantity of the storage battery is less than 30%, the second line is controlled, the first line is disconnected, and the storage battery is in a charging state at the moment.
A sewage treatment device: the structure is shown in figure 1 and figure 2, the following suspension ball fillers are put in the first-stage anaerobic tank, the first-stage aerobic tank, the second-stage anaerobic tank and the second-stage aerobic tank: the suspension ball is made of polyurethane, the built-in filler is volcanic rock fragments with the diameter of 2-3cm, and the diameter of the ball body of the suspension ball is 10cm; the filling amount of the filler is 40-50% of the volume of the reaction tank. The number of the suspended ball fillers put in the first-stage anaerobic tank, the first-stage aerobic tank, the second-stage anaerobic tank and the second-stage aerobic tank is respectively as follows: 127, 92, 142, 80.
The dimensions of the various parts of the wastewater treatment plant are listed in table 1:
table 1 example the dimensions of the parts of the sewage treatment apparatus
Designing process parameters:
design water amount of the device: 1m 3 /d
Hydraulic retention time: the season with much sewage discharge (such as summer) -12h; season with less sewage discharge (such as winter) -18h
Water inflow rate: 61L/h-92L/h
Aeration amount: 2 mg/L-3 mg/L
Fig. 4 shows a dissolved oxygen concentration tank diagram of each tank body in the sewage treatment system of the embodiment in about 6 months from 3 months in 2022 to 8 months in 2022, and as can be seen from fig. 4: the dissolved oxygen concentration of the first aerobic tank and the second aerobic tank is mainly maintained at about 2-3 mg/L, which is beneficial to the growth of aerobic microorganisms in the tank body. The primary anaerobic Chi Rong has a dissolved oxygen concentration of substantially 0mg/L, wherein the microorganisms are in a completely anaerobic state. The second-stage anaerobic tank has certain dissolved oxygen when the concentration of the aerobic tank is higher, and is in an anoxic state, but is mainly kept in an anaerobic state with the dissolved oxygen concentration of 0mg/L under most conditions.
The water quality detection is carried out on five treatment units of the inlet water, the first-stage anaerobic tank, the first-stage aerobic tank, the second-stage anaerobic tank and the second-stage aerobic tank of the sewage treatment device. The water quality monitoring indexes comprise COD, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, TP and orthophosphate of the water body. The water quality test results are listed in table 2:
TABLE 2 Water quality test results
As can be seen from table 2: the treatment rate of the sewage treatment system to COD in water is about 70 percent, and the final effluent concentration is lower than the COD concentration limit value (100 mg/L) of field crops in the Farmland irrigation Water quality Standard (GB 5084-2021). The retention rate of the sewage treatment system on ammonia nitrogen can reach 95%, and the sewage treatment system can also keep a higher level of effluent concentration after two stages of anaerobic and aerobic treatment. The retention of total phosphorus is also high, about 96%, due to the reactor is mainly biological reaction and physical adsorption effect is less. The retention rate of the device to the orthophosphate is very high and can basically reach about 100 percent. The removal rate of the nitrate nitrogen is 67 percent, the removal rate of the nitrite nitrogen is 47 percent, and the effluent concentration is not high, so that the absorption of the crops on the ammonia nitrogen elements is facilitated.
Comparative example 1
The difference from example 1 is that: a1: O1: A2: O2 is adjusted to 1.2.
The water quality of the influent water, the first-stage anaerobic tank, the first-stage aerobic tank, the second-stage anaerobic tank, and the second-stage aerobic tank of the wastewater treatment apparatus of the comparative example were measured. The water quality test results are listed in table 3:
TABLE 3 Water quality test results
As can be seen from tables 3 and 2: by adopting the sewage treatment system provided by the embodiment, the retention rate of ammonia nitrogen and phosphorus in the effluent can be improved, and the removal rate of nitrate nitrogen is improved.
Experimental data show that the sewage treatment system provided by the invention is suitable for agricultural irrigation for the water quality of rural domestic sewage after proper treatment, the influence of the sewage irrigation on the soil environment is reduced, the amount of inorganic nutrient components which are easily absorbed and utilized by crops in the water is increased, and the resource utilization of the rural domestic sewage is realized.
While embodiments of the present invention have been described above, the above description is illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A rural domestic sewage treatment system based on farmland irrigation water quality requirement is characterized by comprising: the device comprises a power supply device, a sewage treatment device and a load device; wherein, the first and the second end of the pipe are connected with each other,
the power supply device includes: the solar energy equipment and the wind energy equipment are connected with the input end of the storage battery, and the output end of the storage battery is connected with the load device through a first line;
the sewage treatment device comprises: the device comprises a regulating tank, a first-stage anaerobic tank, a first-stage aerobic tank, a second-stage anaerobic tank, a second-stage aerobic tank and a sedimentation tank which are arranged in sequence; wherein the effective volume ratio of the first-stage anaerobic tank to the first-stage aerobic tank is (1.0-1.3): 1, the effective volume ratio of the second-stage anaerobic tank to the second-stage aerobic tank is (1.8-2.1): 1.
2. the rural domestic sewage treatment system of claim 1, wherein the effective volume ratio of the first stage anaerobic tank to the second stage anaerobic tank is (0.65-0.80): 1.
3. the rural domestic sewage treatment system of claim 1 wherein a plurality of suspension ball packings are disposed in the primary anaerobic tank, the primary aerobic tank, the secondary anaerobic tank and the secondary aerobic tank; the suspension ball filler comprises: the suspension ball is of a hollow structure, and the filler is arranged in the suspension ball; the suspension ball is made of polyurethane, and the filler is volcanic rock fragments.
4. The rural domestic sewage treatment system of claim 1,
the water inlet of the regulating tank is arranged at the upper part, a first water inlet pipe bent downwards is arranged at the water inlet of the regulating tank, and the tail end of the first water inlet pipe is close to the bottom of the regulating tank; the water outlet of the regulating tank is arranged at the upper part and forms the water inlet of the first-stage anaerobic tank;
a second water inlet pipe bent downwards is arranged at a water inlet of the first-stage anaerobic tank; the tail end of the second water inlet pipe is close to the bottom of the first-stage anaerobic tank; the water outlet of the first-stage anaerobic tank is arranged at the upper part and forms the water inlet of the first-stage aerobic tank;
the water outlet of the first-stage aerobic tank is arranged at the lower part of the first-stage aerobic tank and forms the water inlet of the second-stage anaerobic tank.
5. The rural domestic sewage treatment system of claim 4, wherein the water outlet of the second-stage aerobic tank is arranged in the middle part, which forms the water inlet of the sedimentation tank; the sedimentation tank is provided with the inclined plane of downward sloping in its one side that sets up the water inlet to and two adjacent sides of this face, the bottommost of sedimentation tank is provided with the mud discharge mouth.
6. The rural domestic sewage treatment system of claim 5, wherein a flow guide pipe is arranged between the second-stage aerobic tank and the sedimentation tank, and the flow guide pipe comprises: the first guide pipe is arranged in the second-stage aerobic tank along the vertical direction, one end of the second guide pipe is communicated with the middle part of the first guide pipe, and the other end of the second guide pipe penetrates through the water inlet of the sedimentation tank and then is bent downwards to be arranged at the lower part of the sedimentation tank.
7. The rural domestic sewage treatment system of claim 1, wherein said power supply means further comprises: a second circuit and a PLC control unit; one end of the second line is connected with the commercial power system, and the other end of the second line is connected with the load device; and the PLC control unit is connected with the first circuit and the second circuit and is used for controlling the on-off of the first circuit and the second circuit.
8. A method for recycling rural domestic sewage is characterized by comprising the following steps:
collecting rural domestic sewage, and treating the rural domestic sewage by using the rural domestic sewage treatment system of any one of claims 1 to 7 to obtain reuse water;
and using the reuse water for field irrigation.
9. The rural domestic sewage reuse method according to claim 8, wherein the flow rate of the water flow in the sewage treatment device is set to be 61L-92L/h, and the hydraulic retention time is set to be 12 h-18 h.
10. The rural domestic sewage recycling method of claim 8, wherein the aeration amount of the first-stage aerobic tank and the second-stage aerobic tank is set to be 2mg/L to 3mg/L.
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0027998A1 (en) * | 1979-10-26 | 1981-05-06 | Air Products And Chemicals, Inc. | Process for reabsorption and retention of phosphorus by activated biomass |
| JPH05212390A (en) * | 1992-02-03 | 1993-08-24 | Matsushita Electric Ind Co Ltd | Combined purification tank |
| CN201512458U (en) * | 2009-09-30 | 2010-06-23 | 浙江大学 | Solar rural domestic sewage treatment system |
| CN202337725U (en) * | 2011-12-07 | 2012-07-18 | 重庆大学 | Multi-stage A/O and biological film coupling reaction tank structure for nitrogen and phosphorus removing water treatment |
| CN103058375A (en) * | 2013-01-08 | 2013-04-24 | 北京工业大学 | Anaerobic-aerobic process control method for efficient phosphorus removal and nitrogen reservation of municipal domestic sewage |
| CN103274781A (en) * | 2013-05-30 | 2013-09-04 | 南京市环境保护科学研究院 | Processing method and system of organic solid waste |
| CN103319001A (en) * | 2012-03-23 | 2013-09-25 | 太平洋水处理工程有限公司 | Economical hybrid power biological membrane process |
| CN103819057A (en) * | 2014-03-05 | 2014-05-28 | 东南大学 | Reutilization method for safe irrigation of sewage |
| CN103819056A (en) * | 2014-03-05 | 2014-05-28 | 东南大学 | Reutilization system for safe irrigation of sewage |
| CN104341075A (en) * | 2013-08-01 | 2015-02-11 | 中国环境科学研究院 | Variable-volume improved A<2>/O deep nitrogen and phosphorus removal process for sewage |
| CN105349415A (en) * | 2015-11-16 | 2016-02-24 | 山东圣地电力自动化有限公司 | Solar- and wind-driven generating synergism system of methane tank |
| CN206767884U (en) * | 2017-04-26 | 2017-12-19 | 奉超 | A kind of solar energy and powered by wind energy rural domestic sewage treatment system |
| CN110255812A (en) * | 2019-06-05 | 2019-09-20 | 华东理工大学 | A kind of biochemical and advanced oxidation combined method retaining ammonia nitrogen removal antibiotic in livestock and poultry cultivation sewage disposal process |
| CN214781014U (en) * | 2021-05-25 | 2021-11-19 | 安徽泓济环境科技有限公司 | Rural single household sewage treatment plant |
-
2022
- 2022-08-29 CN CN202211040096.5A patent/CN115448457B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0027998A1 (en) * | 1979-10-26 | 1981-05-06 | Air Products And Chemicals, Inc. | Process for reabsorption and retention of phosphorus by activated biomass |
| JPH05212390A (en) * | 1992-02-03 | 1993-08-24 | Matsushita Electric Ind Co Ltd | Combined purification tank |
| CN201512458U (en) * | 2009-09-30 | 2010-06-23 | 浙江大学 | Solar rural domestic sewage treatment system |
| CN202337725U (en) * | 2011-12-07 | 2012-07-18 | 重庆大学 | Multi-stage A/O and biological film coupling reaction tank structure for nitrogen and phosphorus removing water treatment |
| CN103319001A (en) * | 2012-03-23 | 2013-09-25 | 太平洋水处理工程有限公司 | Economical hybrid power biological membrane process |
| CN103058375A (en) * | 2013-01-08 | 2013-04-24 | 北京工业大学 | Anaerobic-aerobic process control method for efficient phosphorus removal and nitrogen reservation of municipal domestic sewage |
| CN103274781A (en) * | 2013-05-30 | 2013-09-04 | 南京市环境保护科学研究院 | Processing method and system of organic solid waste |
| CN104341075A (en) * | 2013-08-01 | 2015-02-11 | 中国环境科学研究院 | Variable-volume improved A<2>/O deep nitrogen and phosphorus removal process for sewage |
| CN103819057A (en) * | 2014-03-05 | 2014-05-28 | 东南大学 | Reutilization method for safe irrigation of sewage |
| CN103819056A (en) * | 2014-03-05 | 2014-05-28 | 东南大学 | Reutilization system for safe irrigation of sewage |
| CN105349415A (en) * | 2015-11-16 | 2016-02-24 | 山东圣地电力自动化有限公司 | Solar- and wind-driven generating synergism system of methane tank |
| CN206767884U (en) * | 2017-04-26 | 2017-12-19 | 奉超 | A kind of solar energy and powered by wind energy rural domestic sewage treatment system |
| CN110255812A (en) * | 2019-06-05 | 2019-09-20 | 华东理工大学 | A kind of biochemical and advanced oxidation combined method retaining ammonia nitrogen removal antibiotic in livestock and poultry cultivation sewage disposal process |
| CN214781014U (en) * | 2021-05-25 | 2021-11-19 | 安徽泓济环境科技有限公司 | Rural single household sewage treatment plant |
Non-Patent Citations (7)
| Title |
|---|
| 丛广治: "A/O法除磷工艺中污水停留时间的控制", 中国给水排水, no. 12 * |
| 伍万宏;黄祥春;尹晓黎;朱昌友;韩安勤;李必圣;: "种养结合，循环利用畜禽养殖废弃物", 养殖与饲料, no. 11 * |
| 周超群;吴磊;李先宁;洪月菊;张佳杰;: "不同填料短程好氧生物滤池用于农村污水的资源化研究", 水处理技术, no. 12 * |
| 周超群等: "用于农村污水安全灌溉的新型氮磷无机化反应器的实验研究", 农业环境科学学报, vol. 36, no. 07, pages 1443 - 1450 * |
| 尹航等: "不同好/厌氧区容积负荷对生物膜/颗粒污泥耦合工艺脱氮除磷的影响", 环境科学, vol. 35, no. 05, pages 1866 - 1870 * |
| 师旭军;张国珍;武福平;周添红;: "基于ABR技术的干旱半干旱地区农村污水处理技术研究", 环境工程, no. 12 * |
| 朱历;纪荣平;赵思;: "硝化-反硝化曝气生物滤池改进工艺处理水产养殖废水", 扬州大学学报(自然科学版), no. 01 * |
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