CN111302493B - Fine regulation and control method of intensive sewage ecological treatment device - Google Patents
Fine regulation and control method of intensive sewage ecological treatment device Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 69
- 230000033228 biological regulation Effects 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 183
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- 230000000694 effects Effects 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims description 36
- 238000000746 purification Methods 0.000 claims description 32
- 238000010992 reflux Methods 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000010219 correlation analysis Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 244000005700 microbiome Species 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 239000008213 purified water Substances 0.000 claims description 4
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
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- 239000005416 organic matter Substances 0.000 claims description 2
- 238000003883 substance clean up Methods 0.000 claims 1
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 17
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 229910002651 NO3 Inorganic materials 0.000 description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000005273 aeration Methods 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
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- 239000010457 zeolite Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000000370 acceptor Substances 0.000 description 1
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- 230000036284 oxygen consumption Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
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- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
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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
- C02F3/006—Regulation methods for biological treatment
-
- 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
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Biodiversity & Conservation Biology (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Activated Sludge Processes (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
A fine regulation and control method for an intensive sewage ecological treatment device belongs to the field of sewage treatment. The device comprises a water storage and distribution unit, a processing unit and a composite parameter regulation and control system, wherein the composite parameter regulation and control system consists of an online Dissolved Oxygen (DO) detector, an online temperature detector, an online oxidation-reduction potential (ORP) detector, an online pH detector, a valve and the like and a computer regulation and control system; the control precision of the sewage treatment process is remarkably improved by monitoring the composite parameters such as DO value, pH value, ORP value and temperature value in the sewage in real time, a water distribution type and a circulating treatment flow of the sewage ecological treatment process are constructed, and an integrated type intensive sewage ecological treatment device consisting of a water storage and distribution unit and a treatment unit is formed, so that the high-efficiency denitrification effect and stable effluent quality of the sewage ecological treatment system are ensured.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a refined regulation and control method of an intensive sewage ecological treatment device, which is suitable for a decentralized domestic sewage treatment process and achieves the purposes of integration, high efficiency, low cost and less maintenance. The device and the control method adopt the composite water quality parameters to monitor the sewage treatment process, and the stable reoxygenation degree and the stable dissolved oxygen content are achieved in the sewage ecological treatment process by finely regulating and controlling the water distribution mode and the circulating treatment process, so that the synchronous nitrification and denitrification process is promoted, and the treatment effect of the intensive sewage ecological treatment process on total nitrogen, tri-nitrogen and organic matters in domestic sewage is always in a high-efficiency purification and stable running state.
Technical Field
In recent years, the economy of China rapidly develops, but the problems of serious water environment pollution and water resource shortage exist. In rural areas and urban distributed buildings, the sewage has the advantages of small yield and relatively low pollutant concentration. However, the sewage quantity change range is large, the condition that the traditional sewage treatment process (an activated sludge method, a biomembrane method, anaerobic biological treatment and the like) must be operated under constant water quantity cannot be met, the stable treatment effect is affected, and meanwhile, the traditional sewage treatment technology is mostly used for urban centralized sewage treatment and has the characteristics of large energy consumption (comprising a power device, an aeration device and the like), high process control requirement, complex system operation and maintenance, high technical personnel requirement and the like, and is difficult to be applied to the field of treatment of decentralized domestic sewage. The sewage ecological purification technology (artificial wetland, biological pond, ecological floating island, etc.) has the characteristics of low energy consumption, less investment, simple control, landscape effect, etc., and is widely applied to the domestic sewage treatment process of special towns, new rural areas, distributed buildings (hotels, communities, public buildings, etc.). However, the traditional sewage ecological purification technology is severely affected by natural environment, and the problems of large occupied area, more interference factors (seasons, inflow water quality, dissolved oxygen and the like), long hydraulic retention time, poor reoxygenation condition, weak purification capability, poor denitrification effect, unstable outflow water quality and the like still exist through few means of manual improvement and reinforcement. The construction cost and the operation and maintenance difficulty which are obviously improved by adding aeration equipment, strengthening manual regulation and control and the like are greatly limited by the practical application of the traditional sewage ecological purification technology in the decentralized sewage treatment process.
Recently, porous substrates having a certain adsorption amount for contaminants (ammonia nitrogen, phosphorus) are widely used in the biodegradation process of wastewater. More biological binding sites are provided due to their porous nature, and is beneficial to the mass transfer process of oxygen and microorganisms. Therefore, the ecological purification technology taking the porous matrix as the core has more ideal treatment effect on pollutants. Meanwhile, on the premise of meeting the effluent quality standard, the hydraulic retention time can be controlled to be 6-12 hours, compared with 24-72 hours required by the traditional ecological purification technology, the occupied area can be greatly reduced, and a feasibility condition is provided for the application of the intensive ecological purification device in the decentralized sewage treatment. In the sewage purification process, nitrogen removal efficiency is often critical to the water purification process. In a single reactor, a Simultaneous Nitrification and Denitrification (SND) process can remove 95% of the total nitrogen in water. Therefore, whether the SND process is carried out thoroughly directly determines the denitrification performance of the intensive sewage treatment device. According to previous studies, organic carbon sources and dissolved oxygen are important parameters for the SND process. Under the condition of sufficient organic carbon source and dissolved oxygen, oxygen and nitrate can be simultaneously used as electron acceptors to complete the synergistic respiration of microorganisms, so as to achieve high-efficiency denitrification. Therefore, by adjusting the operation mode, dissolved oxygen level and other composite parameters of the intensive ecological purification device, the organic carbon source and dissolved oxygen consumption can be subjected to fine process control in the SND reaction process, and the total nitrogen removal is enhanced. The intensive sewage treatment device and the fine regulation and control method based on the composite parameters save the construction and operation cost of aeration facilities, reduce investment cost and operation energy consumption, and can better apply the sewage ecological treatment technology to decentralized sewage treatment.
Disclosure of Invention
The invention aims to provide a refined regulation and control method of an intensive sewage ecological treatment device, which breaks through the technical bottlenecks of sewage treatment processes of rural and decentralized buildings, solves the problems of large occupied area, unstable effluent quality and poor low-temperature denitrification effect of the traditional ecological treatment technology, remarkably improves the regulation and control precision of the sewage treatment process by monitoring the composite parameters such as DO value, pH value, ORP value, temperature value and the like in sewage in real time, constructs a water distribution type and a circulating treatment flow of the sewage ecological treatment process, and forms the integrated intensive sewage ecological treatment device consisting of a water storage and distribution unit and a treatment unit so as to ensure the high-efficiency denitrification effect and stable effluent quality of a sewage ecological treatment system.
The technical scheme of the invention is as follows: a fine regulation and control method of an intensive sewage ecological treatment device is characterized in that the intensive sewage ecological treatment device is of an integrated type and comprises a water storage and distribution unit, a treatment unit and a composite parameter regulation and control system, wherein the composite parameter regulation and control system consists of an online Dissolved Oxygen (DO) detector, an online temperature detector, an online oxidation-reduction potential (ORP) detector, an online pH detector, a valve and the like and a computer regulation and control system;
The water storage and distribution unit comprises a water storage tank (1), an online DO detector (2), a lifting pump (3), a water inlet valve (4) and a reflux valve (5); a first online DO detector (2) and a lifting pump (3) are arranged above a water storage tank (1), a water inlet valve (4) and a reflux valve (5) are arranged at the bottom of the water storage tank (1), and a water suction pipe of the lifting pump (3) is simultaneously connected with the water inlet valve (4) and the reflux valve (5) in parallel; the treatment unit is positioned at one side of the water storage and distribution unit and sequentially comprises a plant layer (8), a 1# packing layer (9), a 2# packing layer (10) and a water collection layer (11) from top to bottom, wherein a water distribution perforated pipe (6) is arranged on or in the plant layer (8), a plurality of branch pipes (19) are arranged on the water distribution perforated pipe (6), a plurality of water outlets (20) are arranged on each branch pipe, preferably, a plurality of water outlets are uniformly distributed at two sides of the horizontal plane of each branch pipe, a part of water outlets are provided with valves, the valves arranged in the water outlets integrally form a water distribution pipe valve group (7), and preferably, each side of each branch pipe is provided with one valve every 2-6 water outlets; branch pipes (19) are uniformly distributed on the plant layers (8);
The water collecting layer (11) is a unique empty layer channel, and the water discharging valve (12) is arranged on the lateral side of the outer part of the water collecting layer (11); the reflux valve (5) is connected with the water collecting layer (11) through a reflux pipe (13); wherein the water distribution perforated pipe (6) is connected with a water outlet pipe of the lifting pump (3);
The filter layers are formed by a 1# filler layer (9) and a 2# filler layer (10) in the processing unit, and a second online DO detector (14), an online ORP detector (15), an online pH detector (16) and an online temperature detector (17) are arranged in the middle of the filter layers of the processing unit; the detection and control signals of the first online DO detector (2), the lift pump (3), the water inlet valve (4), the reflux valve (5), the water distribution pipe electromagnetic valve group (7), the drain valve (12), the second online DO detector (14), the online ORP detector (15), the online pH detector (16) and the online temperature detector (17) are all connected with the computer regulation and control system (18).
The filler of the No. 1 filler layer (9) and the No. 2 filler layer (10) is selected from porous fillers such as volcanic rock, shale, activated aluminum balls, zeolite and the like. The types of the fillers, the grain size grading of the fillers, the thickness of the filler layer and the like can be regulated and controlled according to test and test data of main regulating factors such as sewage quality, climate environment, filler biomembrane, hydraulic load and the like.
The refined regulation and control method of the intensive sewage ecological treatment device comprises the following regulation and control processes: regulating and controlling the reoxygenation quantity of the inflow water according to the DO content range of the online DO detector (2), and regulating and controlling the reoxygenation quantity according to the DO monitoring value. The following 3 modes are adopted; mode 1: when DO content in the water storage tank (1) is smaller than a low-limit threshold value, the computer regulation and control system (18) opens the lifting pump (3) and closes all water distribution pipe valve groups (7), and inflow water enters the processing unit from the water storage tank (1) through the water distribution perforated pipe (6); mode 2: when DO content in the water storage tank (1) is in a middle threshold range, a computer regulation and control system (18) starts a lifting pump (3) and a part of water distribution valve groups (7), and inflow water enters a treatment unit from the water storage tank (1) through a water distribution perforated pipe (6) and outlets of the part of water distribution valve groups (7); mode 3: when DO content in the water storage tank (1) is greater than a high-limit threshold value, the computer regulation and control system (18) starts the lifting pump (3) and all water distribution valve groups (7), and inflow water enters the treatment unit from the water storage tank (1) through the water distribution perforated pipe (6) and all outlets of the water distribution valve groups (7). After the purification unit finishes water distribution and water distribution, a lifting pump (3) and a water distribution valve group (7) are closed, and DO value, ORP value, pH value and temperature value signals are respectively detected and collected in real time by an online DO detector (10), an online ORP detector (11), an online pH detector (12) and an online temperature detector (13), and the collected real-time data is subjected to weight analysis and correlation calculation by a computer control system (18) and is compared with a set corresponding threshold value;
After the ORP value and the first derivative of the pH value in the processing unit are stabilized within a set range and are continuously stabilized for a period of time, the computer regulation and control system (18) starts to compare the average value of the temperature of the processing unit with a set temperature threshold range; when the temperature value is greater than the set temperature threshold value, starting a drain valve (12), directly draining purified water in the treatment unit, and starting a new treatment operation period after the draining process is completed for 2 hours; when the temperature value is smaller than the temperature threshold value, a reflux valve (5) is opened, the outlet water is refluxed to the water storage tank (1) for circulation treatment, the reoxygenation amount of the inlet water is regulated and controlled again according to the DO value content range of the first online DO detector (2), and after the water distribution and water distribution are completed by the treatment unit, a lifting pump (3) and a water distribution valve group (7) are closed for circulation treatment of the refluxed inlet water for one time; the computer regulation system (18) continuously detects and collects the ORP value and the pH value in the processing unit, namely the purifying unit, calculates that the first derivatives of the ORP value and the pH value are stable in a set range and continuously stabilizes for a period of time, then starts the drain valve (12), directly discharges purified water in the processing unit, and starts a new processing operation period after the water discharge process is completed for 2 hours.
The DO content threshold value setting range, ORP value in the processing unit and pH value first derivative setting range of the first online DO detector (2) are required to be subjected to correlation analysis and weight calculation by a computer regulation and control system (18) according to test and test data of main regulation and control factors such as inflow water quality, filler type, filler layer thickness, biological purification effect, plant purification effect and the like, so that the optimal numerical regulation and control range is obtained. The compound purifying condition of the intensive sewage treatment device for ecological plant purification, microorganism purification and filler purification is that the first derivative of ORP value and pH value in the treatment unit is obviously stabilized within the range of-2.75 to 3.20mV/min and-0.5 to 0.5, and the duration and stability are more than 3 hours.
Judging that the condition of the effluent water circulation treatment process is not in the temperature threshold range of 15-17 ℃, and obtaining a determined temperature threshold after correlation analysis and weight calculation by a computer regulation system (18) according to the test and test data of main regulation factors such as the organic matter content, DO value, ORP value, pH value, biodegradability of the inlet water, the activity of a filler biomembrane, carbon nitrogen ratio and the like.
The filler of the No.1 filler layer (9) and the No. 2 filler layer (10) can be porous fillers such as volcanic rock, shale, activated aluminum balls, zeolite and the like. The types of the fillers, the filler grading, the thickness of the filler layer and the like are all determined by a computer regulation and control system (18) after correlation analysis and weight calculation according to test and test data of main regulation and control factors such as sewage quality, climate environment, filler biomembrane, hydraulic load and the like.
The invention has the beneficial effects that:
(1) The characteristics of small sewage yield and large variation amplitude of rural and decentralized buildings are fully utilized, an intermittent operation mode is formed according to sewage differentiation, and the problems of treatment efficiency and process regulation and control existing in the application of the traditional sewage treatment process in the rural and decentralized building fields are effectively solved.
(2) The constructed sewage ecological treatment device can improve the mass transfer efficiency of oxygen by using a 'fast water inlet and fast water discharge' operation mode, strengthen a natural reoxygenation mode and effectively improve reoxygenation efficiency; the intermittent operation mode is utilized to provide an alternate reoxygenation environment, so that the denitrification effect is enhanced, and the defect that the denitrification effect is poor due to nitrate accumulation is overcome.
(3) The method adopts real-time monitoring of various critical water quality and hydraulic parameters to realize the refined control of parameters such as dissolved oxygen content and the like of the intermittent sewage treatment device, better promotes synchronous nitrification and denitrification, improves denitrification effect, and reduces investment cost and operation energy consumption.
(4) The integrated type is convenient for installation and maintenance of rural and decentralized buildings, and the intensive type and the circulating treatment mode can solve various problems caused by the multistage treatment units in the aspects of process, operation, management, cost and the like.
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
Further objects, functions and advantages of the present invention will be clarified by the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
Fig. 1 schematically shows a structural diagram of an intensive sewage treatment device and a refinement method based on composite parameters according to the present invention: the intelligent water distribution system comprises a water storage tank (1), a first online DO detector (2), a lifting pump (3), a water inlet valve (4), a reflux valve (5), a water distribution perforated pipe (6), a water distribution pipe valve gate group (7), a plant layer (8), a No. 1 filler layer (9), a No. 2 filler layer (10), a water collection layer (11), a drain valve (12), a reflux pipe (13), a second online DO detector (14), an online ORP instrument (15), an online pH instrument (16) and an online thermometer (17), a computer regulation and control system (18), a branch pipe (19) and a water outlet hole (20).
Fig. 2 schematically shows a water distribution perforated pipe (6) and a water distribution pipe valve gate group (7) of the invention.
The purification unit of fig. 3 is operated at normal temperature for a period of contaminant variation. (a) COD and DO; (b) NH 4 +-N,NO2 --N,NO3 - -N and TN.
The purification unit of fig. 4 operates at low temperature for a period of contaminant variation. (a) COD and DO; (b) NH 4 +-N,NO2 --N,NO3 - -N and TN.
Detailed Description
The objects and functions of the present invention and methods for achieving these objects and functions will be elucidated by referring to exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; this may be implemented in different forms. The essence of the description is merely to aid one skilled in the relevant art in comprehensively understanding the specific details of the invention.
Example 1:
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.
The inflow water of the intensive sewage ecological treatment device enters the water storage tank (1) after being filtered, the front end of the inflow water pipeline which enters the water distribution perforated pipe (6) of the integrated device is provided with a second filter, impurities in the water are filtered, the blockage of the lifting pump, the lifting pump (3) and the orifice of the water distribution perforated pipe (6) is avoided, and the normal operation of the integrated device is ensured. The starting of the electric valve meets a certain water pressure requirement of 0.04-0.1 Mpa.
When the DO content in the water storage tank (1) is smaller than the low-limit threshold value of 0.5mg/L, a computer regulation and control system (18) starts the lift pump (3) and closes the water distribution pipe valve electromagnetic valve group (7), sewage enters the purification unit from the water storage tank (1) through the water distribution perforated pipe (6), the computer regulation and control system (18) starts the lift pump (3) and all the water distribution electromagnetic valve groups (7), and sewage enters the purification unit from the water storage tank (1) through the water distribution perforated pipe (6) and all the water distribution electromagnetic valve groups (7).
After the purification unit finishes water distribution and water distribution, a lifting pump (3) and a water distribution electromagnetic valve group (7) are closed, a second online DO detector (14), an online ORP detector (11), an online pH detector (12) and an online temperature detector (13) respectively detect and collect DO value, ORP value, pH value and temperature value in real time, a computer regulation and control system (18) continuously detects and collects ORP value and pH value, the first derivative of ORP value or pH value is obviously stabilized within the range of-2.75 mV/min to 3.20mV/min or-0.5 to 0.5, and is stabilized for 3 hours, the computer regulation and control system (18) compares the optimized DO value and the DO value of the second online DO detector (14) with the set temperature threshold range of 15 ℃ to 17 ℃ and the DO threshold range, and when the temperature value is not obviously smaller than the set temperature threshold range, the computer regulation and control system (18) starts a drain valve (12) to directly drain sewage in the purification unit.
The inflow water quality of the intensive sewage ecological treatment device is CODcr:150～300mg/L,TN:25～55mg/L,NH4 +-N:20～50mg/L,NO3 --N:1.5～5mg/L., the effluent concentration of COD cr in the final sewage is less than 20mg/L, the ammonia nitrogen is less than 5mg/L, the total nitrogen is less than 8mg/L, and the concentration of nitrogen and organic pollutants in the effluent all reach the first grade A standard GB18918-2002 of sewage discharge Standard of urban sewage treatment plant.
Example 2:
the lift pump (3), the water inlet valve (4) and the water distribution pipe electromagnetic valve group (7) are started, the opening state of partial valves of the water distribution electromagnetic valve group (7) is firstly regulated according to the DO content range of the first online DO detector (2), the reoxygenation amount of inflow water is regulated, the DO content in the water storage tank (1) is positioned in the middle limit threshold range of 0.8 mg/L-2.2 mg/L, the lift pump (3) and partial water distribution electromagnetic valve group (7) are started by the computer regulation and control system (18), and sewage enters the purification unit from the water storage tank (1) through the water distribution perforated pipe (6) and the outlet of the partial water distribution electromagnetic valve group (6).
After the purification unit finishes water distribution and water distribution, the lifting pump (3) and the water distribution electromagnetic valve group (7) are closed, the second online DO detector (14), the online ORP detector (11), the online pH detector (12) and the online temperature detector (13) respectively detect and collect DO value, ORP value, pH value and temperature value in real time, the computer regulation and control system (18) continuously detects and collects ORP value and pH value, the first derivative of ORP value or pH value is obviously stabilized within the range of-2.75 mV/min to 3.20mV/min or-0.5 to 0.5, and is stabilized for 3 hours, the computer regulation and control system (18) compares the optimized DO value of the second online DO detector (14) with the set temperature threshold range of 15 ℃ to 17 ℃ and the DO threshold range, and when the temperature value is obviously smaller than the set temperature threshold range, the computer regulation and control system (18) opens the reflux valve (5) and simultaneously opens the lifting pump (3) and the water distribution electromagnetic valve group (7) to purify the sewage in the water storage tank (1). The computer regulation system (18) continuously detects and collects the ORP value and the pH value, the first derivative of the ORP value or the pH value is obviously stabilized in the range of-2.75 mV/min to 3.20mV/min or-0.5 to 0.5, and the ORP value or the first derivative of the pH value is stabilized for 3 hours. The computer regulation system (18) opens the drain valve (12), and the sewage in the purification unit is directly discharged.
The inflow water quality of the intensive sewage ecological treatment device is CODcr:150～300mg/L,TN:25～55mg/L,NH4 +-N:20～50mg/L,NO3 --N:1.5～5mg/L., the effluent concentration of COD cr in the final effluent is less than 30mg/L, ammonia nitrogen is less than 8mg/L, total nitrogen is less than 12mg/L, and the concentration of nitrogen and organic pollutants in the effluent all reach the first grade A standard GB18918-2002 of wastewater discharge Standard of urban wastewater treatment plant.
Other embodiments of the invention will be apparent to and understood by those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (1)
1. A fine regulation and control method of an intensive sewage ecological treatment device is characterized in that the intensive sewage ecological treatment device is of an integrated type and comprises a water storage and distribution unit, a treatment unit and a composite parameter regulation and control system, wherein the composite parameter regulation and control system consists of an online DO detector, an online temperature detector, an online ORP detector, an online pH detector, a valve and a computer regulation and control system;
The water storage and distribution unit comprises a water storage tank (1), a first online DO detector (2), a lifting pump (3), a water inlet valve (4) and a reflux valve (5); a first online DO detector (2) and a lifting pump (3) are arranged above a water storage tank (1), a water inlet valve (4) and a reflux valve (5) are arranged at the bottom of the water storage tank (1), and a water suction pipe of the lifting pump (3) is simultaneously connected with the water inlet valve (4) and the reflux valve (5) in parallel; the treatment unit is positioned at one side of the water storage and distribution unit and sequentially comprises a plant layer (8), a 1# packing layer (9), a 2# packing layer (10) and a water collecting layer (11) from top to bottom, wherein a water distribution perforated pipe (6) is arranged on the plant layer (8), a plurality of branch pipes (19) are arranged on the water distribution perforated pipe (6), a plurality of water outlet holes (20) are arranged on each branch pipe, a plurality of water outlet holes are uniformly distributed at two sides of the horizontal plane of each branch pipe, a valve is arranged in part of the water outlet holes, the valves arranged in the water outlet holes integrally form a water distribution pipe valve group (7), and a valve is arranged on each side of each branch pipe at intervals of 2-6 water outlet holes; branch pipes (19) are uniformly distributed on the plant layers (8);
The water collecting layer (11) is the only empty layer channel, and the water discharging valve (12) is arranged on the lateral side of the outer part of the water collecting layer (11); the reflux valve (5) is connected with the water collecting layer (11) through a reflux pipe (13); wherein the water distribution perforated pipe (6) is connected with a water outlet pipe of the lifting pump (3);
The filter layers are formed by a 1# filler layer (9) and a 2# filler layer (10) in the processing unit, and a second online DO detector (14), an online ORP detector (15), an online pH detector (16) and an online temperature detector (17) are arranged in the middle of the filter layers of the processing unit; the detection and control signals of the first online DO detector (2), the lift pump (3), the water inlet valve (4), the reflux valve (5), the water distribution pipe electromagnetic valve group (7), the drain valve (12), the second online DO detector (14), the online ORP detector (15), the online pH detector (16) and the online temperature detector (17) are all connected with the computer regulation and control system (18);
The method for carrying out fine regulation and control on the intensive sewage ecological treatment device comprises the following regulation and control processes: regulating and controlling the oxygen enrichment amount of the inflow water according to the DO content range of the first online DO detector (2), and regulating and controlling the oxygen enrichment amount according to the DO monitoring value; the following 3 modes are adopted; mode 1: when DO content in the water storage tank (1) is smaller than a low-limit threshold value, the computer regulation and control system (18) opens the lifting pump (3) and closes all water distribution pipe valve groups (7), and inflow water enters the processing unit from the water storage tank (1) through the water distribution perforated pipe (6); mode 2: when DO content in the water storage tank (1) is in a middle threshold range, a computer regulation and control system (18) starts a lifting pump (3) and a part of water distribution valve groups (7), and inflow water enters a treatment unit from the water storage tank (1) through a water distribution perforated pipe (6) and outlets of the part of water distribution valve groups (7); mode 3: when DO content in the water storage tank (1) is greater than a high-limit threshold value, a computer regulation and control system (18) starts a lifting pump (3) and all water distribution valve groups (7), and inflow water enters the treatment unit from the water storage tank (1) through a water distribution perforated pipe (6) and outlets of all water distribution valve groups (7); after the purification unit finishes water distribution and water distribution, a lifting pump (3) and a water distribution valve group (7) are closed, and DO value, ORP value, pH value and temperature value signals are respectively detected and collected in real time by a first online DO detector (2), an online ORP detector (15), an online pH detector (16) and an online temperature detector (17), and the collected real-time data is subjected to weight analysis and correlation calculation by a computer regulation and control system (18) and is compared with a set corresponding threshold value;
After the ORP value and the first derivative of the pH value in the processing unit are stabilized within a set range and are continuously stabilized for a period of time, the computer regulation and control system (18) starts to compare the average value of the temperature of the processing unit with a set temperature threshold range; when the temperature value is greater than the set temperature threshold value, starting a drain valve (12), directly draining purified water in the treatment unit, and starting a new treatment operation period after the draining process is completed for 2 hours; when the temperature value is smaller than the temperature threshold value, a reflux valve (5) is opened, the outlet water is refluxed to the water storage tank (1) for circulation treatment, the oxygen enrichment amount of the inlet water is regulated and controlled again according to the DO value content range of the first online DO detector (2), and after the treatment unit finishes water distribution and water distribution, a lifting pump (3) and a water distribution valve group (7) are closed for circulation treatment of the refluxed inlet water for one time; the computer regulation and control system (18) continuously detects and collects the ORP value and the pH value in the processing unit, namely the purifying unit, calculates that the first derivatives of the ORP value and the pH value are stable in a set range and continuously stabilizes for a period of time, then starts the drain valve (12), directly discharges purified water in the processing unit, and starts a new processing operation period after the water discharge process is completed for 2 hours;
the DO content threshold value setting range, ORP value and pH value first derivative setting range of the first online DO detector (2) need to be according to the water quality of inflow water, filler type, filler layer thickness, biological purification effect and main regulation factor of plant purification effect test and test data, after the computer regulation system (18) carries on the correlation analysis and weight calculation, obtain the optimal numerical value regulation range;
The intensive sewage treatment device completes the compound purification effects of ecological plant purification, microorganism purification and filler purification, the first derivative of ORP value and pH value in the treatment unit is obviously stabilized within the range of-2.75 to 3.20 mV/min and-0.5 to 0.5, and the duration and stability are more than 3 h;
judging that the condition of the effluent water circulation treatment process is not in the temperature threshold range of 15-17 ℃, and obtaining a determined temperature threshold after correlation analysis and weight calculation by a computer regulation system (18) according to the organic matter content, DO value, ORP value, pH value and biodegradability of the inlet water and test data of main regulation factors of the activity and the carbon nitrogen ratio of the filler biomembrane;
The filler types, filler gradations and filler layer thicknesses of the No. 1 filler layer (9) and the No. 2 filler layer (10) are all determined by performing correlation analysis and weight calculation by a computer regulation system (18) according to test and test data of main regulation factors of sewage quality, climate environment, filler biomembrane and hydraulic load.
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