CN116573764A - Sewage treatment device with low C/N ratio and treatment method - Google Patents
Sewage treatment device with low C/N ratio and treatment method Download PDFInfo
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- CN116573764A CN116573764A CN202310447843.5A CN202310447843A CN116573764A CN 116573764 A CN116573764 A CN 116573764A CN 202310447843 A CN202310447843 A CN 202310447843A CN 116573764 A CN116573764 A CN 116573764A
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- 239000010865 sewage Substances 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005273 aeration Methods 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 claims abstract description 30
- 238000004062 sedimentation Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 9
- 229910052698 phosphorus Inorganic materials 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 9
- 241000894006 Bacteria Species 0.000 description 8
- 241001453382 Nitrosomonadales Species 0.000 description 7
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 206010021143 Hypoxia Diseases 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000001546 nitrifying effect Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000007954 hypoxia Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 239000004343 Calcium peroxide Substances 0.000 description 1
- PDNNQADNLPRFPG-UHFFFAOYSA-N N.[O] Chemical compound N.[O] PDNNQADNLPRFPG-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 description 1
- 235000019402 calcium peroxide Nutrition 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- VTIIJXUACCWYHX-UHFFFAOYSA-L disodium;carboxylatooxy carbonate Chemical compound [Na+].[Na+].[O-]C(=O)OOC([O-])=O VTIIJXUACCWYHX-UHFFFAOYSA-L 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229940045872 sodium percarbonate Drugs 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage treatment device with low C/N ratio and a treatment method thereof, comprising a box body, wherein an adjusting tank, an anaerobic tank, an acclimation tank, an aerobic tank, an anoxic tank and a sedimentation tank are sequentially arranged in the box body; the regulating tank is provided with a water inlet, a heating plate is arranged in the tank, and the regulating tank is communicated with the anaerobic tank; the domestication tank is communicated with the anaerobic tank and the aerobic tank, aeration devices are arranged at the bottoms of the domestication tank and the aerobic tank, and ultraviolet lamp tubes are arranged in gaps of the aeration devices of the domestication tank; the anoxic tank is communicated with the aerobic tank and the sedimentation tank; the sedimentation tank is provided with a water outlet; and mud outlets are also formed at the bottoms of the regulating tank, the anaerobic tank, the anoxic tank and the sedimentation tank. The sewage treatment method comprises water temperature adjustment, anaerobic treatment, aerobic treatment, anoxic treatment and sedimentation treatment. The device and the method can rapidly realize the short-cut nitrification process of sewage, save the addition cost of carbon sources and remarkably improve the denitrification and dephosphorization capacity.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a sewage treatment device with low C/N ratio on a plateau and a treatment method.
Background
The air in the western plateau area is thin, the annual average temperature is low, and the oxygen deficiency is caused by the special adverse factors, so that the traditional sewage treatment mode is difficult. At present, the sewage treatment of the plateau is mainly focused on solving the problem of low temperature, mostly by burying and adding a covering, and also partly by utilizing clean energy of the plateau to heat the sewage. The lack of research on hypoxia problems is mainly achieved by increasing the efficiency of blowers and aerators and adding oxygenation agents (commonly used calcium peroxide, sodium percarbonate, etc.) to increase dissolved oxygen. But the energy consumption is relatively increased while the aeration intensity is improved; the oxygen increasing agent is directly put into water, so that uneven oxygen increasing and waste phenomena are easy to occur.
The nitrification is the autotrophic oxidation of ammonia nitrogen into nitrate under aerobic condition, and the process is divided into two stages, firstly ammonia nitrogen is converted into nitrite (2 NH) under the action of oxygen Ammonia Oxidizing Bacteria (AOB) 4 + +3O 2 →2NO 2 - +4H + +2H 2 O) followed by conversion to nitrate (2 NO) by Nitrite Oxidizing Bacteria (NOB) 2 - +O 2 →2NO 3 - ). The traditional biological denitrification process needs a large amount of oxygen to supply in the nitrification process, and organic matters are needed as carbon sources in the denitrification process, so that the problems of overlarge energy consumption and medicine consumption exist, and the method belongs to an energy-intensive process. Short-cut nitrification can solve the difficulty, and the inherent difference of the dynamics characteristics of the nitrate bacteria and the nitrite bacteria is utilized to control the nitrifying process in the nitrite stage, so that the nitrifying process is not further converted into nitrate nitrogen. The short-cut nitrification and denitrification technology is to directly perform denitrification reaction on the basis of short-cut nitrification, and compared with the traditional whole-cut nitrification, the short-cut nitrification and denitrification technology omits NO 2 - Oxidation of (nitrous acid) to NO 3 - (nitric acid) and NO 3 - Denitrification to NO 2 - Therefore, the method has the advantages of saving aeration energy consumption, denitrifying carbon sources, reducing sludge yield and the like. Short-cut nitrification is marked by stable and high NO 2 - -N (nitrite nitrogen) accumulation, howControlling the growth of AOB and NOB to stop nitrification at NO 2 - The stage is the key to achieving short-cut nitrification, wherein factors influencing nitrous acid accumulation mainly include temperature, DO concentration, free Ammonia (FA) concentration, free Nitrous Acid (FNA) concentration, pH value, sludge age and organic matter concentration.
Traditional A 2 the/O (Anaerobic Anoxic Oxic) process is an earlier process designed according to basic theories such as biological denitrification and dephosphorization to remove pollutants, and is widely applied to sewage treatment; however, if the C/N ratio of the sewage in the plateau area is low, the carbon demand of denitrification in the anoxic tank cannot be met, and part of NO is generated 3 - N can not be denitrified to enter an anaerobic tank to influence phosphorus-accumulating bacteria to release phosphorus, so that the treatment effect of the process is poor, but the existing method generally increases organic matters (carbon sources) to improve the C/N ratio, and also partially considers improvement of process steps, mainly aims at improving aeration or film formation to increase the residence time and the like, but the existing method is not ideal in treating the low C/N sewage effect of the plateau, so that the development of a short-range nitrification technology suitable for the sewage treatment of the low-temperature environment of the plateau is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sewage treatment device with low C/N ratio and a treatment method.
The aim of the invention is achieved by the following technical scheme: the sewage treatment device with the low C/N ratio comprises a box body, wherein an adjusting tank, an anaerobic tank, an acclimation tank, an aerobic tank, an anoxic tank and a sedimentation tank are sequentially arranged in the box body;
the regulating tank is provided with a water inlet, a heating plate is arranged in the tank, and the regulating tank is communicated with the anaerobic tank;
the domestication tank is communicated with the anaerobic tank and the aerobic tank, aeration devices are arranged at the bottoms of the domestication tank and the aerobic tank, and ultraviolet lamp tubes are arranged in gaps of the aeration devices of the domestication tank;
the anoxic tank is communicated with the aerobic tank and the sedimentation tank;
the sedimentation tank is provided with a water outlet;
and mud outlets are also formed at the bottoms of the regulating tank, the anaerobic tank, the anoxic tank and the sedimentation tank.
Further, the regulating tank is provided with a stirrer.
Further, the domestication pond is equipped with the pH monitor, and domestication pond and hypoxia pond are equipped with DO monitor.
Further, the heating plate is connected with a storage battery, the storage battery is connected with a controller, and the controller is connected with the solar panel.
Further, the volume ratio of the anaerobic tank to the aerobic tank to the anoxic tank is 1:3:1.
Further, the aeration device comprises an aeration pipeline and a microporous aeration head, the aeration pipeline comprises a main pipeline and a plurality of branch pipelines, and the branch pipelines are arranged on one side or two sides of the main pipeline in parallel and are communicated with the main pipeline; the microporous aeration head is arranged on the branch pipeline.
A method for treating sewage by a sewage treatment device with low C/N ratio, comprising the following steps:
s1, water temperature adjustment: the sewage with low C/N ratio enters an adjusting tank from a water inlet after being filtered by an external grating, and a heating plate is opened to heat the sewage to 20-25 ℃;
s2, anaerobic treatment: flowing the sewage with the water temperature regulated into an anaerobic tank, and controlling the sewage residence time of the anaerobic tank to be 2.5-3.5 h;
s3, aerobic treatment: the anaerobic treated sewage flows into a domestication pond to be firstly domesticated, the pH value of the sewage is regulated to 7-8, an ultraviolet lamp is turned on, an aeration device in the domestication pond and an aeration device in an aerobic pond are simultaneously turned on, DO is controlled to be 1.5-2 mg/L, the wavelength of the ultraviolet lamp is 360-370 nm, and the radiation intensity is 0.8 gamma 10 -6 ～0.9╳10 -6 Einstein/(L.s), the residence time of the sewage in the domestication pond is 1.5-3 h; the domesticated sewage flows into an aerobic tank, and the residence time of the sewage is controlled to be 12-15 h;
s4, anoxic treatment: after aerobic treatment, sewage flows into an anoxic tank, DO is controlled to be 0.2-0.5 mg/L, and sewage residence time is 3-4 h;
s5, precipitation treatment: the sewage after anoxic treatment flows into a sedimentation tank, the sewage retention time is 1.5-2.5 h, and the supernatant fluid flows out, namely the treated water.
Further, the sewage is plateau sewage.
In the invention, the following components are added: the sewage treatment device with low C/N ratio of the invention is characterized in that A 2 Inversion is performed on the basis of the/O process to exert the advantages of short-range nitrification, so that short-range nitrification is realized rapidly. PN (Partial Nitrification) is short-cut nitrification, which is formed in the aerobic section, and denitrification and nitrogen removal in the anoxic section. A is that 2 O (Anaerobic Anoxic Oxic), namely a traditional Anaerobic anoxic-aerobic process, wherein A (Anaerobics) is an Anaerobic section for removing phosphorus, O (Oxic) is an aerobic section, and is commonly used for removing organic matters in water; a (Anoic) is an Anoxic zone for nitrogen removal. The device reduces the step of refluxing nitrified liquid from the aerobic tank to the anoxic tank after the aerobic tank is placed in the anaerobic tank in front of the anoxic tank. And a domestication pond is added in front of the aerobic pond, and the short-range nitrification process is realized and controlled by a long-wave ultraviolet irradiation device to catalyze the reaction.
The water temperature adjusting step of the invention heats the sewage to 20-25 ℃, and the temperature promotes the growth of AOB, which is beneficial to starting the short-cut nitrification stage of the aerobic tank;
the phosphorus accumulating bacteria consume most of carbon sources for phosphorus release in the anaerobic treatment step, part of organic matters in sewage are removed in the area, and meanwhile, microorganisms fully store internal carbon sources;
the domestication treatment step can promote the activity of AOB and inhibit the activity of NOB under the continuous irradiation of long-wave ultraviolet rays; the pH is regulated to 7-8, so that the AOB growth can be promoted and the NOB growth can be inhibited under the condition; meanwhile, the pH value influences the FA and FNA in the sewage, the high pH value can enable the high-concentration FA to be formed in the system, and the high FA can inhibit the growth of NOB.
Organic matters are removed from the aerobic tank and nitrified in the aerobic treatment stage, and at the moment, the NO is promoted because the AOB is taken as a dominant strain 2 - -N accumulates to form short range nitrites; meanwhile, the phosphorus accumulating bacteria excessively absorb phosphorus under the aerobic condition.
In the anaerobic treatment stage, the denitrifying bacteria reduce nitrite into nitrogen to escape nitrogen from sewage, and the C/N ratio of the sewage with high primary activity is lower.
The invention hasHas the following advantages: the device disclosed by the invention overcomes the difficulty that the existing sewage treatment method cannot remove nitrogen and phosphorus for the sewage in the high-altitude low-temperature environment and low C/N ratio, can rapidly realize the short-range nitrification process of the sewage, has a simple structure and high-integration integrated equipment, is convenient for construction and management operation in the high-altitude area, and saves the later operation and maintenance and management cost. The invention is to make the traditional A 2 The inversion of the O process and the control of important parameters of each step can realize the rapid short-cut nitrification process; the sewage disinfection effect is achieved while the formation of the short-range nitrification process is promoted by utilizing long-wave ultraviolet catalysis, the process flow is shortened, and the construction cost and the medicament cost are saved; with the process of the present invention, the hydraulic retention time is prolonged in the anoxic zone, compared with conventional A 2 the/O process reduces the reflux and aeration of the nitrifying liquid, reduces the competition of carbon sources with phosphorus accumulating bacteria while reducing the nitrate nitrogen in the reflux sludge, avoids the problem that the carbon sources cannot be required by denitrification of an anoxic tank, saves the adding cost of the carbon sources, and remarkably improves the denitrification and dephosphorization capacity due to the formation of short-range nitrification.
Drawings
FIG. 1 is a schematic plan view of the device of the present invention.
FIG. 2 is a schematic diagram of the distribution structure of the aeration device and the ultraviolet lamp tube in the domestication pond.
Fig. 3 is a schematic diagram of a connection structure of a solar heating panel.
In the figure, a 1-regulating tank, a 2-anaerobic tank, a 3-domestication tank, a 4-aerobic tank, a 5-anoxic tank, a 6-sedimentation tank, a 7-water inlet, an 8-heating plate, a 9-stirrer, a 10-storage battery, an 11-controller, a 12-solar panel, a 13-ultraviolet lamp tube, a 14-pH monitor, a 15-water outlet, a 16-mud discharge port, a 17-aeration device, a 18-microporous aeration head, a 19-aeration pipeline and a 20-DO monitor.
Detailed Description
The invention will be further described with reference to the following examples of embodiments of the accompanying drawings, to which the scope of the invention is not limited:
as shown in fig. 1, the sewage treatment device with low C/N ratio comprises a box body, wherein an adjusting tank 1, an anaerobic tank 2, a domestication tank 3, an aerobic tank 4, an anoxic tank 5 and a sedimentation tank 6 are sequentially arranged in the box body;
the regulating tank 1 is provided with a water inlet 7, a heating plate 8 is arranged in the tank, and the regulating tank 1 is communicated with the anaerobic tank 2; in order to make the water temperature heat more uniformly, a stirrer 9 is arranged in the regulating tank 1 to stir sewage; as shown in fig. 3, the heating plate 8 is connected with the storage battery 10, the storage battery 10 is connected with the controller 11, the controller 11 is connected with the solar panel 12, and solar energy is adopted to heat the heating plate 8;
the domestication tank 3 is communicated with the anaerobic tank 2 and the aerobic tank 4, aeration devices 17 are arranged at the bottoms of the domestication tank 3 and the aerobic tank 4, and ultraviolet lamp tubes 13 are arranged in gaps between the aeration devices 17 of the domestication tank 3 as shown in fig. 2; the domestication pool 3 is provided with a pH monitor 14, the domestication pool 3 and the anoxic pool 5 are provided with DO monitors 20, the pH value and DO value change of sewage in the pool can be monitored in real time, and the pH value and DO value of the sewage can be regulated and controlled in real time according to the detection values;
the anoxic tank 5 is communicated with the aerobic tank 4 and the sedimentation tank 6;
the sedimentation tank 6 is provided with a water outlet 15;
the bottoms of the regulating tank 1, the anaerobic tank 2, the anoxic tank 5 and the sedimentation tank 6 are also provided with a sludge discharge port 16, and the sludge at the bottom is discharged out of the device through the sludge discharge port 16.
As a preferable technical scheme of the invention, the volume ratio of the anaerobic tank 2 to the aerobic tank 4 to the anoxic tank 5 is 1:3:1, and the ratio can maximally realize the short-cut nitrification of the sewage to be treated. The aeration device 17 in the device comprises an aeration pipeline 19 and a microporous aeration head 18, wherein the aeration pipeline 19 comprises a main pipeline and a plurality of branch pipelines which are arranged on one side or two sides of the main pipeline in parallel and are communicated with the main pipeline; the microporous aeration head 18 is arranged on the branch pipeline. In the domestication tank 3, the ultraviolet lamp 13 is arranged at the lower part of the aeration device 17, and a plurality of ultraviolet lamps 13 are arranged in parallel and are parallel to the main pipeline of the aeration pipeline 19.
Example 1: a method for treating sewage by a sewage treatment device with low C/N ratio, comprising the following steps:
s1, water temperature adjustment: the sewage with the low C/N ratio on the plateau enters the regulating tank 1 from the water inlet 7 after being filtered by an external grating, and the heating plate 8 is opened to heat the sewage to 20 ℃;
s2, anaerobic treatment: flowing the sewage with the water temperature regulated into the anaerobic tank 2, and controlling the sewage residence time of the anaerobic tank 2 to be 3.5 and h;
s3, aerobic treatment: the anaerobic treated sewage flows into the domestication pond 3 for domestication treatment, the pH value of the sewage is regulated to 7, an ultraviolet lamp is turned on, an aeration device 17 in the domestication pond 3 and an aeration device 17 in an aerobic pond 4 are simultaneously turned on, DO is controlled to be 1.5 mg/L, the wavelength of the ultraviolet lamp is 360 nm, and the radiation intensity is 0.8 x 10 -6 Einstein/(L.s), the residence time of the sewage in the domestication pond is 1.5 h; the domesticated sewage flows into the aerobic tank 4, and the residence time of the sewage is controlled to be 14 h;
s4, anoxic treatment: the sewage after the aerobic treatment flows into an anoxic tank 5, DO is controlled at 0.2 mg/L, and the sewage residence time is 4 h;
s5, precipitation treatment: the sewage after anoxic treatment flows into the sedimentation tank 6, the sewage retention time is 2 h, and the supernatant fluid flows out, namely the treated water.
Example 2: a method for treating sewage by a sewage treatment device with low C/N ratio, comprising the following steps:
s1, water temperature adjustment: the sewage with the low C/N ratio on the plateau enters the regulating tank 1 from the water inlet 7 after being filtered by an external grating, and the heating plate 8 is opened to heat the sewage to 25 ℃;
s2, anaerobic treatment: flowing the sewage with the water temperature regulated into the anaerobic tank 2, and controlling the sewage residence time of the anaerobic tank 2 to be 2.5 and h;
s3, aerobic treatment: the anaerobic treated sewage flows into the domestication pond 3 for domestication treatment, the pH value of the sewage is regulated to 8, an ultraviolet lamp is turned on, an aeration device 17 in the domestication pond 3 and an aeration device 17 in the aerobic pond 4 are simultaneously turned on, DO is controlled to be 2 mg/L, the wavelength of the ultraviolet lamp is 370 nm, and the radiation intensity is 0.9 gamma 10 -6 Einstein/(L.s), the residence time of the sewage in the domestication pond is 2 h; the domesticated sewage flows into the aerobic tank 4, and the residence time of the sewage is controlled to be 15 h;
s4, anoxic treatment: the sewage after the aerobic treatment flows into an anoxic tank 5, DO is controlled at 0.5 mg/L, and the sewage residence time is 3 h;
s5, precipitation treatment: the sewage after anoxic treatment flows into a sedimentation tank 6, the sewage retention time is 1.5 and h, and the supernatant fluid flows out to obtain the treated water.
Example 3: a method for treating sewage by a sewage treatment device with low C/N ratio, comprising the following steps:
s1, water temperature adjustment: the sewage with the low C/N ratio on the plateau enters the regulating tank 1 from the water inlet 7 after being filtered by an external grating, and the heating plate 8 is opened to heat the sewage to 23 ℃;
s2, anaerobic treatment: flowing the sewage with the water temperature regulated into the anaerobic tank 2, and controlling the sewage retention time of the anaerobic tank 2 to be 3 h;
s3, aerobic treatment: the anaerobic treated sewage flows into the domestication pond 3 for domestication treatment, the pH value of the sewage is regulated to 7.6, an ultraviolet lamp is turned on, an aeration device 17 in the domestication pond 3 and an aeration device 17 in the aerobic pond 4 are simultaneously turned on, DO is controlled to be 1.8 mg/L, the wavelength of the ultraviolet lamp is 365 nm, and the radiation intensity is 0.85 gamma 10 -6 Einstein/(L.s), the residence time of the sewage in the domestication pond is 3 h; the domesticated sewage flows into the aerobic tank 4, and the residence time of the sewage is controlled to be 12 h;
s4, anoxic treatment: after aerobic treatment, sewage flows into an anoxic tank 5, DO is controlled at 0.3 mg/L, and the sewage residence time is 3.5h;
s5, precipitation treatment: the sewage after anoxic treatment flows into a sedimentation tank 6, the sewage retention time is 2.5 and h, and the supernatant fluid flows out to obtain the treated water.
The following examples are used to illustrate the beneficial effects of the invention:
the experimental sewage was obtained in a domestic sewage collection tank of a sewage treatment station in a town (altitude about 3000 m) in Jiulong county, ganzhu, sichuan province, at a water temperature of about 10 ℃, and the pollutant contents were as shown in the following table.
Experiments are carried out by adopting the device and the method described in the embodiment 3, firstly, sewage is connected into the device, after the device is stabilized, the effluent can stably reach the first-class A standard in pollutant emission Standard of urban sewage treatment plant GB18918-2002, and the effluent monitoring result pair is shown in the following table 1:
TABLE 1 effluent monitoring results
Wherein, the measurement method of SS adopts GB11901-89 weight method to measure, the measurement method of COD value adopts HJ 828-2017 potassium dichromate method to measure BOD 5 The measurement method of the value adopts a dilution and inoculation method of HJ 505-2009 for measurement, the measurement method of ammonia nitrogen adopts a Nahner reagent spectrophotometry of HJ 535-2009, and the monitoring method of total phosphorus adopts an ammonium molybdate spectrophotometry of GB 11893-89.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art who is skilled in the art to which the present invention pertains will appreciate that the technical scheme and the inventive concept according to the present invention are equally substituted or changed within the scope of the present invention.
Claims (8)
1. The sewage treatment device with the low C/N ratio comprises a box body and is characterized in that an adjusting tank (1), an anaerobic tank (2), a domestication tank (3), an aerobic tank (4), an anoxic tank (5) and a sedimentation tank (6) are sequentially arranged in the box body;
the regulating tank (1) is provided with a water inlet (7), a heating plate (8) is arranged in the tank, and the regulating tank (1) is communicated with the anaerobic tank (2);
the domestication tank (3) is communicated with the anaerobic tank (2) and the aerobic tank (4), aeration devices (17) are arranged at the bottoms of the domestication tank (3) and the aerobic tank (4), and ultraviolet lamp tubes (13) are arranged in gaps of the aeration devices (17) of the domestication tank (3);
the anoxic tank (5) is communicated with the aerobic tank (4) and the sedimentation tank (6);
the sedimentation tank (6) is provided with a water outlet (15);
the bottoms of the regulating tank (1), the anaerobic tank (2), the anoxic tank (5) and the sedimentation tank (6) are also provided with a sludge discharge port (16).
2. A low C/N ratio sewage treatment plant according to claim 1, characterized in that the regulating tank (1) is provided with a stirrer (9).
3. The sewage treatment device with low C/N ratio according to claim 1, characterized in that the acclimation tank (3) is provided with a pH monitor (14), and the acclimation tank (3) and the anoxic tank (5) are provided with DO monitors (20).
4. The low C/N ratio sewage treatment device according to claim 1, wherein the heating plate (8) is connected with a battery (10), the battery (10) is connected with a controller (11), and the controller (11) is connected with a solar panel (12).
5. The low C/N ratio sewage treatment device according to claim 1, wherein the volume ratio of the anaerobic tank (2), the aerobic tank (4) and the anoxic tank (5) is 1:3:1.
6. A low C/N ratio sewage treatment device according to claim 1, wherein the aeration device (17) comprises an aeration pipe (19) and a microporous aeration head (18), the aeration pipe (19) comprising a main pipe and a plurality of branch pipes arranged in parallel to each other on one side or both sides of the main pipe and communicating with the main pipe; the microporous aeration head (18) is arranged on the branch pipeline.
7. The method for treating sewage by a sewage treatment apparatus of low C/N ratio according to claim 1, comprising the steps of:
s1, water temperature adjustment: the sewage with low C/N ratio enters the regulating tank (1) from the water inlet (7) after being filtered by an external grating, and the heating plate (8) is opened to heat the sewage to 20-25 ℃;
s2, anaerobic treatment: flowing the sewage with the water temperature regulated into an anaerobic tank (2), and controlling the sewage residence time of the anaerobic tank (2) to be 2.5-3.5 h;
s3, aerobic treatment: anaerobic reactorThe sewage after oxygen treatment flows into the domestication pond (3) for domestication treatment, the pH value of the sewage is adjusted to 7-8, an ultraviolet lamp is turned on, an aeration device (17) in the domestication pond (3) and an aerobic pond (4) is simultaneously turned on, DO is controlled to be 1.5-2 mg/L, the wavelength of the ultraviolet lamp is 360-370 nm, and the radiation intensity is 0.8 gamma 10 -6 ～0.9╳10 -6 Einstein/(L.s), the residence time of the sewage in the domestication pond is 1.5-3 h; the domesticated sewage flows into an aerobic tank (4), and the residence time of the sewage is controlled to be 12-15 h;
s4, anoxic treatment: after aerobic treatment, sewage flows into an anoxic tank (5), DO is controlled to be 0.2-0.5 mg/L, and the sewage residence time is 3-4 h;
s5, precipitation treatment: the sewage after anoxic treatment flows into a sedimentation tank (6), the sewage retention time is 1.5-2.5 h, and the supernatant fluid flows out, namely the treated water.
8. The method for treating sewage by a low C/N ratio sewage treatment apparatus as claimed in claim 7, wherein said sewage is a plateau sewage.
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