CN115594296B - Sewage treatment equipment and process for synchronous aerobic biochemical treatment and solid-liquid separation - Google Patents
Sewage treatment equipment and process for synchronous aerobic biochemical treatment and solid-liquid separation Download PDFInfo
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- CN115594296B CN115594296B CN202211420626.9A CN202211420626A CN115594296B CN 115594296 B CN115594296 B CN 115594296B CN 202211420626 A CN202211420626 A CN 202211420626A CN 115594296 B CN115594296 B CN 115594296B
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- 239000007788 liquid Substances 0.000 title claims abstract description 97
- 239000010865 sewage Substances 0.000 title claims abstract description 95
- 238000000926 separation method Methods 0.000 title claims abstract description 62
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 26
- 238000005273 aeration Methods 0.000 claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000010802 sludge Substances 0.000 claims abstract description 37
- 238000004062 sedimentation Methods 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims description 88
- 239000001301 oxygen Substances 0.000 claims description 62
- 229910052760 oxygen Inorganic materials 0.000 claims description 62
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 42
- 239000011259 mixed solution Substances 0.000 claims description 38
- 238000010992 reflux Methods 0.000 claims description 25
- 239000012071 phase Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 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 claims description 12
- 239000007791 liquid phase Substances 0.000 claims description 11
- 238000001556 precipitation Methods 0.000 claims description 11
- 241000894006 Bacteria Species 0.000 claims description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 10
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 10
- 241001330002 Bambuseae Species 0.000 claims description 10
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 10
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 10
- 230000001580 bacterial effect Effects 0.000 claims description 10
- 239000011425 bamboo Substances 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 8
- 230000001546 nitrifying effect Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 238000005191 phase separation Methods 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 abstract description 3
- 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
- 230000001276 controlling effect Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000006396 nitration reaction Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000005276 aerator Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000011499 joint compound Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000004103 aerobic respiration Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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
- C02F3/02—Aerobic processes
-
- 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
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
-
- 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
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- 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 application discloses sewage treatment equipment with synchronous aerobic biochemical and solid-liquid separation, which comprises a sewage treatment cylinder, wherein a first aerobic zone and a solid-liquid separation zone are arranged in the sewage treatment cylinder, a first aeration device is arranged at the bottom of the first aerobic zone, a second aeration device is arranged at the bottom of the solid-liquid separation zone, a separator is arranged in the middle of the solid-liquid separation zone, a second aerobic zone is formed between the separator and the second aeration device, the second aerobic zone is communicated with the first aerobic zone, a sedimentation zone is formed between the separator and the top of the solid-liquid separation zone, a gas stripping return pipe is connected to the separator, and a water outlet pipe is arranged at the upper part of the sedimentation zone. The application has the effect of reducing the condition that the mixed liquor in the solid-liquid separation area generates anaerobic reaction and the sludge accumulation at the bottom of the mixed liquor influences the water quality to reach the standard.
Description
Technical Field
The application relates to the field of sewage treatment, in particular to sewage treatment equipment and technology for synchronous aerobic biochemical treatment and solid-liquid separation.
Background
In the field of sewage treatment, the method for artificially domesticating microbial flora, namely an activated sludge process, and removing pollutant indexes such as organic matters, ammonia nitrogen, total phosphorus and the like is the most economical and practical sewage treatment method. The method generally comprises anaerobic, aerobic, reflux, precipitation separation and other process sections, and sewage is gradually remained in each process section. The activated sludge bacterial colony and sewage form mixed solution, most pollutants are removed through anaerobic/aerobic biological contact oxidation, and after solid-liquid separation of the muddy water mixed solution is completed in a precipitation unit, tail water is discharged after reaching standards.
In the related art, a precipitation unit for solid-liquid separation is arranged behind an aerobic process section by adopting sewage treatment equipment of an activated sludge method or an improved process thereof, and the two precipitation units are mutually independent and are carried out step by step. In the aerobic process section, two elements of nitrogen and phosphorus can be transformed in morphology: 1) The nitrogen compound is subjected to nitration reaction in an aerobic environment, ammonia nitrogen is converted into nitrate nitrogen, then the nitrate nitrogen is refluxed to an anoxic section for denitrification reaction, the nitrate nitrogen is converted into gaseous nitrogen and released into the atmosphere, and ammonia nitrogen is removed; 2) In an aerobic environment, phosphorus accumulating bacteria perform aerobic respiration, organic matters stored in the body are continuously decomposed, meanwhile, the organic matters are extracted from the water body environment to generate energy, the energy matters can enable ADP and phosphoric acid in the phosphorus accumulating bacteria to react and be converted into ATP, the process is called phosphorus accumulating reaction, and the bacteria which excessively absorb the phosphorus matters are discharged out of a sewage system along with surplus sludge, so that phosphorus removal is completed. In the solid-liquid separation process section, the following method is adopted to complete solid-liquid separation: 1. setting enough static residence time to enable the solid suspended matters to be statically settled at the bottom; 2. the bottom sludge is refluxed and discharged sufficiently in time, and the front-end bacterial sludge is supplemented and the total phosphorus is removed. However, in practical engineering application, the process parameters of the existing process and equipment are very easily affected by external environment, and become difficult to control, specifically: 1) The mixed solution entering the precipitation zone is extremely easy to generate anaerobic reaction; 2) There are a plurality of blind areas in sedimentation zone bottom, and sedimentation mud can't in time discharge fully. These two points lead to at least the following three disadvantages: a. anaerobic reaction occurs on the bottom sludge which is difficult to discharge, and the bottom sludge is blackened and smelly, so that the produced water has poor sense or exceeds the standard of chromaticity; b. part of nitrate nitrogen in the mixed solution generates nitrogen in a precipitation section due to denitrification reaction of anaerobic, and gas-attached sludge floats on the liquid surface, so that the S.S of effluent exceeds the standard; c. under anaerobic conditions, phosphorus-accumulating bacteria react to release phosphorus in the body back to the water body, so that the yielding water TP exceeds the standard.
With respect to the related art in the above, the applicant believes that the following drawbacks exist: the mixed liquid in the solid-liquid separation area is easy to generate anaerobic reaction, and sludge accumulation at the bottom is not discharged sufficiently in time.
Disclosure of Invention
In order to reduce anaerobic reaction and bottom sludge accumulation of mixed liquor in a solid-liquid separation area, the application provides sewage treatment equipment and process with synchronous aerobic biochemical and solid-liquid separation.
In a first aspect, the application provides sewage treatment equipment with synchronous aerobic biochemical and solid-liquid separation, which adopts the following technical scheme:
the utility model provides an aerobic biochemical and synchronous sewage treatment device of solid-liquid separation, includes a sewage treatment section of thick bamboo, be provided with first good oxygen district and solid-liquid separation district in the sewage treatment section of thick bamboo, first good oxygen district bottom is provided with first aeration equipment, the bottom of solid-liquid separation district is provided with the second aeration equipment, the middle part of solid-liquid separation district is provided with the separator, form the good oxygen district of second between separator and the second aeration equipment, good oxygen district intercommunication of second first good oxygen district, form the sedimentation zone between the top of separator and solid-liquid separation district, the separator is connected with the air stripping back flow, the upper portion of sedimentation zone is provided with the outlet pipe.
By adopting the technical scheme, the sewage mixed solution is subjected to nitration reaction in the first aerobic zone, ammonia nitrogen is converted into nitrate nitrogen, then the nitrate nitrogen enters the second aerobic zone, after further contact aerobic reaction, the three-phase mixed solution rises to enter the separator, after mud, water and gas are separated under the action of the separator, the liquid phase upwards enters the precipitation zone and is discharged from the water outlet pipe, and the gas phase and mud phase mixed solution is discharged through the gas stripping return pipe. The application skillfully realizes synchronous aerobic biochemical treatment and solid-liquid separation through the separator, and the sewage can be subjected to solid-liquid separation while undergoing an aerobic reaction, so that anaerobic reaction and denitrification reaction of the sludge in a solid-liquid separation process Duan Fa can be reduced, and the phenomena of blackening and stinking of the treated water and exceeding indexes are reduced. The application collects and discharges the gas which is exposed out of the second aeration device through the separator and the stripping reflux pipe, and prevents the gas from entering the sedimentation zone, thereby reducing the adverse effect of the second aeration device on the sedimentation of the sludge in the sedimentation zone, so that the sludge in the sedimentation zone can sink back statically, and the condition that the gas adheres to the sludge and floats out of the liquid level is reduced.
Preferably, the separator comprises a gas collecting tank and at least two layers of inverted V-shaped plates which are spaced and staggered, a gas chamber is formed below the inverted V-shaped plates, the gas chamber is connected with the gas collecting tank, and the gas collecting tank is connected with the gas stripping return pipe.
Through adopting above-mentioned technical scheme, the gas in the second good oxygen district rises and gathers in the air chamber, then gathers the gas tank, and the atmospheric pressure in gas tank forms the ascending power, carries the mixed solution and gets into the gas stripping back flow, flows back mixed solution to well section of thick bamboo and inner tube, realizes energy recuperation, no longer need promote with the water pump and carry out the internal reflux, has promoted the treatment effeciency of equipment.
Preferably, the number of the gas stripping return pipes is plural, the number of the second aeration devices is plural, and the number of the second aeration devices and the number of the gas stripping return pipes are in one-to-one correspondence in number and positions.
By adopting the technical scheme, a plurality of second aeration devices are arranged, so that the reflux quantity of each gas stripping reflux pipe can be controlled separately.
Preferably, the sewage treatment cylinder comprises an inner cylinder, a middle cylinder and an outer cylinder, wherein the inner cylinder is provided with an anaerobic zone, the middle cylinder is provided with a micro-oxygen zone, at least one gas stripping return pipe is communicated with the anaerobic zone, and the rest gas stripping return pipes are communicated with the micro-oxygen zone.
Through adopting above-mentioned technical scheme, the mixed liquor backward flow is carried out to little oxygen district and anaerobism district to the gas stripping back flow, provides little oxygen district and the required microorganism in anaerobism district for sewage treatment circulation goes on, and the anaerobic environment of inner tube and the little oxygen environment of inner tube can be controlled to the reflux volume of control gas stripping back flow.
Preferably, the anaerobic treatment device further comprises a control system, the second aerobic zone is provided with a first detector for detecting the dissolved oxygen concentration of the sewage mixed solution, the micro-aerobic zone is provided with a second detector for detecting the dissolved oxygen concentration of the sewage mixed solution, the anaerobic zone is provided with a third detector for detecting the dissolved oxygen concentration of the sewage mixed solution, and the first detector, the second detector and the third detector are respectively and electrically connected with the control system.
By adopting the technical scheme, the first detector, the second detector and the third detector are respectively used for detecting DO concentrations of the second aerobic zone, the micro-aerobic zone and the anaerobic zone so as to monitor and adjust at any time.
Preferably, the middle cylinder and the outer cylinder are both provided with a partition plate, an overflow pump is arranged on the partition plate, and the overflow pump is electrically connected with the control system.
By adopting the technical scheme, the control system adjusts the thrust by changing the rotating speed of the overflow pump, thereby achieving the purpose of controlling the flow speed of the mixed liquid in the cylinder, and the baffle plate ensures that the water flow runs towards one direction and no countercurrent or turbulent flow is generated.
In a second aspect, the application provides a sewage treatment process with synchronous aerobic biochemical and solid-liquid separation, which adopts the following technical scheme:
the sewage treatment process with synchronous aerobic biochemical and solid-liquid separation comprises the following steps:
step 1, sewage to be treated flows into the bottom of an inner cylinder, upward forms upward flow, is uniformly mixed with active bacterial sludge mixed liquid which is extracted and returned from a solid-liquid separation area, is subjected to anaerobic reaction in an anaerobic area, and overflows into a middle cylinder after anaerobic reaction;
step 2, mixing the sewage in the cylinder with active bacterial sludge and nitrifying liquid which are extracted and returned from the solid-liquid separation area, carrying out denitrification reaction in the micro-oxygen area, converting nitrate nitrogen in the mixed liquid into gaseous nitrogen under the action of denitrifying bacteria to overflow, removing ammonia nitrogen, and then allowing the sewage mixed liquid to enter the outer cylinder;
step 3, the first aeration device supplies oxygen to the first aerobic zone, the sewage mixed solution in the outer cylinder is subjected to an aerobic nitrification reaction in the aerobic environment of the first aerobic zone, ammonia nitrogen in the sewage mixed solution is converted into substances such as nitrate nitrogen under the action of nitrifying bacteria, and then the substances enter the second aerobic zone;
and 4, the second aeration device performs oxygen supply aeration on the second aerobic zone, the sewage mixed liquor in the solid-liquid separation zone is subjected to aerobic contact reaction in the second aerobic zone, then rises to enter the separator, solid phase, liquid phase and gas phase three-phase separation is performed under the action of the separator, the liquid phase upwards enters the precipitation zone and is discharged from the water outlet pipe, solid sludge is statically precipitated back to the second aerobic zone to form mixed liquor, and the mixed liquor is collected into the gas collecting tank along with aeration gas from the separator, and then is stripped and flows back to the anaerobic zone and the micro-aerobic zone.
By adopting the technical scheme, the application synchronously carries out the aerobic biochemical treatment and the solid-liquid separation, and the static residence time required by the sedimentation tank is shorter, thereby improving the sewage treatment efficiency and reducing the equipment cost; and the gas phase and mud phase mixed liquid is refluxed to the anaerobic zone and the micro-aerobic zone through the gas stripping reflux pipe, so that the sewage treatment can complete internal circulation and is convenient for adjusting various process parameters, and adverse effects of external environment on the process parameters are reduced.
Preferably, in the step 1, DO concentration in the inner cylinder is monitored in real time, the stripping reflux quantity of the mixed solution is controlled by adjusting the second aeration device, and the DO value is kept constant within the range of 0-0.2 mg/L.
Through adopting above-mentioned technical scheme, through the air stripping reflux volume of regulation second aeration equipment control mixed solution for the environment in anaerobic zone stabilizes at suitable scope, improves anaerobic reaction's efficiency.
Preferably, in the step 2, the DO concentration in the middle cylinder is monitored in real time, the stripping reflux quantity of the mixed solution is controlled by adjusting the second aeration device, and the DO value is kept constant within the range of 0.2-0.5 mg/L.
Through adopting above-mentioned technical scheme, through adjusting the air stripping reflux volume of second aeration equipment control mixed solution for the environment of little oxygen district stabilizes at suitable scope, improves denitrification reaction's efficiency.
Preferably, in the steps 3 and 4, the DO concentration in the second aerobic zone is monitored in real time, the DO concentration in the first aerobic zone is regulated to be constant in a proper range by the first aeration device, and the DO concentration value in the second aerobic zone is indirectly controlled to be in a range of 0.8-1.5 mg/L.
By adopting the technical scheme, the DO concentration of the first aerobic zone is constant in a proper range by adjusting the first aeration device, the DO concentration value of the second aerobic zone is controlled while the oxygen demand of the biochemical reaction of the first aerobic zone is met, the environmental parameter of the second aerobic zone is maintained in a proper range, and the anaerobic reaction of the second aerobic zone is reduced.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the sewage mixed liquid enters a second aerobic zone of the solid-liquid separation zone, after further contact aerobic reaction, one path of mixed liquid rises to enter a separator, and after three-phase separation of mud, water and gas is carried out under the action of the separator, a liquid phase upwards enters a precipitation zone and is discharged from a water outlet pipe, and the gas phase and mud phase mixed liquid is discharged through gas stripping. According to the application, through the separator, the synchronous implementation of aerobic biochemistry and solid-liquid separation is skillfully realized, and the phenomenon that the sludge of the precipitation unit undergoes anaerobic reaction to cause blackening and odor generation and the effluent index exceeds the standard is reduced;
2. the gas in the second aerobic zone is recovered through the separator and used as the power for gas stripping and reflux of the gas phase and solid phase mixed liquid, and a water pump is not needed for carrying out mixed liquid reflux, so that the equipment structure is simplified effectively, the equipment energy consumption is reduced, and the treatment efficiency of the equipment is improved.
Drawings
FIG. 1 is a schematic plan view of a sewage treatment apparatus with synchronous aerobic biochemical and solid-liquid separation according to the present application;
FIG. 2 is a schematic view in section A-A of FIG. 1;
FIG. 3 is a schematic view in partial cross-section B-B of FIG. 1;
fig. 4 is a schematic plan layout of the aeration apparatus of the present application (irrelevant parts are omitted).
Reference numerals illustrate: 1. an inner cylinder; 2. a middle cylinder; 3. an outer cylinder; 4. a separator; 5. a gas chamber; 6. a gas collecting tank; 7. a water collection tank; 8. a water inlet pipe; 9. a weir crest; 10. a water passing port; 11. a water outlet pipe; 12. a gas stripping return line; 13. a partition plate; 14. an overflow pump; 15. a first aeration device; 16. a second aeration device; I. a first aerobic zone; II. A micro-oxygen region; III, an anaerobic zone; IV, a second aerobic zone; v, a sedimentation area.
Detailed Description
The application is described in further detail below with reference to fig. 1-4.
The present application will now be described in detail with reference to the drawings and the detailed description thereof, wherein the application is illustrated by the schematic drawings and the detailed description thereof, which are included to illustrate and not to limit the application.
The embodiment of the application discloses sewage treatment equipment and a process for synchronous aerobic biochemical treatment and solid-liquid separation.
Referring to fig. 1 and 2, an aerobic biochemical and solid-liquid separation synchronous sewage treatment device comprises a sewage treatment cylinder, wherein the sewage treatment cylinder comprises an outer cylinder 3, a middle cylinder 2 arranged in the outer cylinder 3 and an inner cylinder 1 arranged in the middle cylinder 2, an anaerobic zone III is arranged in the inner cylinder 1, a micro-oxygen zone II is arranged between the inner wall of the middle cylinder 2 and the outer wall of the inner cylinder, two functional zones are arranged between the inner wall of the outer cylinder 3 and the outer wall of the middle cylinder 2, and are respectively a first aerobic zone I and a solid-liquid separation zone, and the first aerobic zone I is arranged on one side of the solid-liquid separation zone. The inner tube 1 is connected with inlet tube 8, the bottom of inner tube 1 is extended to inlet tube 8's one end, the sewage that waits to treat flows into in the inner tube 1 from inlet tube 8, the upper end of the lateral wall of inner tube 1 is equipped with weir 9, anaerobic zone III's sewage overflows from weir 9 and enters into little oxygen zone II, well section of thick bamboo 2 is equipped with the water gap 10 near the lower part of first good oxygen zone I's lateral wall, little oxygen zone II's sewage enters into first good oxygen zone I through water gap 10, the lower part in first good oxygen zone I intercommunication solid-liquid separation district, first good oxygen zone I's sewage enters into the bottom in solid-liquid separation district. The bottom of the first aerobic zone I is provided with a first aeration device 15 for providing needed dissolved oxygen for the contact aerobic reaction. The bottom of the solid-liquid separation area is provided with a second aeration device 16, the middle part of the solid-liquid separation area is provided with a separator 4, a second aerobic area IV is formed between the separator 4 and the second aeration device 16, the second aerobic area IV is communicated with a first aerobic area I, a sedimentation area V is formed between the separator 4 and the top of the solid-liquid separation area, a water collecting tank 7 is arranged above the sedimentation area V, and the water collecting tank 7 is connected with a water outlet pipe 11. Sewage enters a micro-aerobic zone II after anaerobic reaction in an anaerobic zone III, denitrification reaction in the micro-aerobic zone II, aerobic reaction in a first aerobic zone I, solid-liquid separation zone and three-phase separation in an oxygen-enriched environment. In the second aerobic zone IV, the second aeration device 16 aerates the second aerobic zone IV, the separator 4 collects and discharges the gas phase and the solid phase of the second aerobic zone IV, and simultaneously blocks the gas of the second aerobic zone IV from entering the sedimentation zone V, so that the sedimentation zone V can be kept to be normally kept still for sedimentation, and the water purified by the sedimentation in the sedimentation zone V is discharged.
Referring to fig. 3, the separator 4 includes a gas collecting channel 6 and at least two layers of inverted V-shaped plates arranged in a staggered manner with a spacing therebetween, wherein the upper and lower rows of inverted V-shaped plates partially overlap in the vertical direction, and two sides of each inverted V-shaped plate overlap with two adjacent inverted V-shaped plates in the vertical direction respectively, so that the gas in the second aerobic zone IV cannot directly rise and escape to the settling zone V. The air chamber 5 is formed below the inverted V-shaped plate, the inverted V-shaped plate is arranged along the radial direction of the outer cylinder 3, one end of the inverted V-shaped plate is fixedly connected with the inner wall of the outer cylinder 3, the other end of the inverted V-shaped plate is fixedly connected with the air collecting groove 6, the air collecting groove 6 is fixed on the outer wall of the middle cylinder 2, and the air chamber 5 is communicated with the air collecting groove 6. The gas collecting tank 6 is connected with a plurality of gas stripping reflux pipes 12, wherein at least one gas stripping reflux pipe 12 extends into the inner cylinder 1 and is communicated with the anaerobic zone III, and the rest gas stripping reflux pipes 12 extend into the middle cylinder 2 and are communicated with the micro-oxygen zone II. After the gas phase, the liquid phase and the sludge in the second aerobic zone IV rise to the inverted V-shaped plate, the gas phase enters the gas chamber 5, part of the liquid phase and part of the sludge enter the sedimentation zone V from a gap between the inverted V-shaped plates, then the sludge entering the sedimentation zone V is settled by standing and falls back to the second aerobic zone IV to form mixed liquor, the liquid phase rises to pass through the water collecting tank 7 and then is discharged from the water outlet pipe 11, and the mixed liquor of the second aerobic zone IV flows back to the anaerobic zone III and the micro-oxygen zone II through the gas stripping return pipe 12 under the action of the gas pressure of the gas collecting tank 6.
Referring to fig. 4, the second aerator 16 is provided in plural, and the plural second aerators 16 and the plural gas stripping return pipes 12 are in one-to-one correspondence in number and positions. Each second aeration device 16 is provided with an independent valve to control the air flow, so as to control the flow of the mixed liquid in the gas stripping return pipe 12, the air flow of the second aeration devices 16 is controlled by the valve to adjust the reflux amount of the mixed liquid, and the mixed liquid contains a large amount of dissolved oxygen, so that the anaerobic environment of the inner cylinder 1 and the micro-oxygen environment of the inner cylinder 1 can be controlled by controlling the reflux amount of the mixed liquid.
The middle cylinder 2 and the outer cylinder 3 are both provided with a baffle 13, the baffle 13 is arranged along the radial direction of the outer cylinder 3, the weir crest 9 and the water passing port 10 are respectively arranged on two sides of the baffle 13, and the baffle 13 ensures that water flows in one direction without generating countercurrent or turbulent flow. The baffle 13 between the inner cylinder 1 and the middle cylinder 2 separates the weir 9 from the water passing port 10, so that sewage entering the micro-aerobic zone II from the weir 9 flows clockwise around the middle cylinder 2 to the water passing port 10, and the sewage can fully perform denitrification reaction in the micro-aerobic zone II. The baffle 13 between the outer cylinder 3 and the middle cylinder 2 separates one end of the first aerobic zone I from one end of the second aerobic zone IV, and sewage entering the first aerobic zone I can pass through the whole first aerobic zone I, so that the sewage can perform full aerobic reaction in the first aerobic zone I. The flow-through pumps 14 are respectively arranged on the partition plate 13 between the inner cylinder 1 and the middle cylinder 2 and the partition plate 13 between the outer cylinder 3 and the middle cylinder 2, the flow directions of the two flow-through pumps 14 are opposite, and the flow-through pumps 14 are used for adjusting the flow speed of the mixed liquid in the micro-oxygen area II and the first aerobic area I, so that the mixed liquid flows more stably in the micro-oxygen area II and the first aerobic area I, is more uniformly mixed and has more complete reaction.
The sewage treatment apparatus of this embodiment further includes a control system electrically connected to the first aeration device 15, the second aeration device 16, and the overflow pump 14, respectively, and controlling the operating states and operating parameters of the first aeration device 15, the second aeration device 16, and the overflow pump 14. The second aerobic zone IV is provided with a first detector for detecting the dissolved oxygen concentration of the sewage mixed solution, the micro-aerobic zone II is provided with a second detector for detecting the dissolved oxygen concentration of the sewage mixed solution, the anaerobic zone III is provided with a third detector for detecting the dissolved oxygen concentration of the sewage mixed solution, the first detector, the second detector and the third detector are respectively and electrically connected with a control system, and the control system controls the working parameters of the second aeration device 16 according to the signals of the first detector, the second detector and the third detector, so that the environmental parameters of the anaerobic zone III and the micro-aerobic zone II are adjusted.
The implementation principle of the sewage treatment equipment with synchronous aerobic biochemical and solid-liquid separation in the embodiment of the application is as follows: the sewage to be treated enters an anaerobic zone III and is mixed with active bacterial sludge flowing back by a gas stripping return pipe 12, then anaerobic reaction is carried out in the anaerobic zone III, overflows from a weir 9 and enters a micro-aerobic zone II, is mixed with active bacterial sludge flowing back by the gas stripping return pipe 12 in the micro-aerobic zone II, is subjected to denitrification reaction in the micro-aerobic zone II, then flows to a first aerobic zone I from a water outlet 10, is subjected to nitration reaction in the first aerobic zone I, and then enters a second aerobic zone IV, and the first aeration device 15 and the second aeration device 16 keep the dissolved oxygen amount of the first aerobic zone I and the second aerobic zone IV. The sewage mixed liquor rises in the second aerobic zone IV to reach the inverted V-shaped plate, the gas phase rises into the gas chamber 5 below the inverted V-shaped plate, then enters the gas collecting tank 6 and forms certain gas pressure, part of the sewage mixed liquor continues to rise through the gap of the inverted V-shaped plate and enters the sedimentation zone V, the sludge sinks back in the sedimentation process of the sedimentation zone V, falls to the inverted V-shaped plate, falls into the second aerobic zone IV through the gap between the inverted V-shaped plates under the action of gravity to form mixed liquor, and the sludge content of the mixed liquor of the second aerobic zone IV becomes large. The air pressure in the gas collecting tank 6 enables the gas to drive the mixed liquid in the gas collecting tank 6 to enter the gas stripping return pipe 12, and the mixed liquid in the second aerobic zone IV can flow to the gas collecting tank 6, and continuously flows back to the anaerobic zone III and the micro-aerobic zone II from the gas stripping return pipe 12. The solid-liquid separation of the sewage is carried out in an aerobic environment, and the anaerobic reaction and the denitrification reaction of the sludge in the solid-liquid separation process Duan Fa can be reduced, so that the situations of blackening and stinking of the treated water and exceeding indexes are reduced. In the embodiment, the separator 4 and the stripping reflux pipe 12 collect and discharge the gas exposed by the second aeration device 16, so as to prevent the gas from entering the sedimentation zone V, reduce the adverse effect of the second aeration device 16 on the sedimentation of the sludge in the sedimentation zone V, thereby enabling the sludge in the sedimentation zone V to sink back statically and reducing the condition that the gas adheres to the sludge and floats out of the liquid level; and meanwhile, the gas which is exposed by the second aeration device 16 is used as the power for discharging the sludge, so that the energy is saved.
The embodiment of the application also discloses a sewage treatment process with synchronous aerobic biochemical and solid-liquid separation, which comprises the following steps:
step 1, sewage flows into the bottom of the inner cylinder 1 from the water inlet pipe 8, upward flows, is uniformly mixed with active bacterial sludge mixed solution which flows back from the solid-liquid separation area through the gas stripping return pipe 12, is subjected to anaerobic reaction in the anaerobic area III, and overflows from the weir crest 9 to enter the micro-aerobic area II.
Step 2, mixing the sewage in the micro-aerobic zone II with active bacterial sludge and nitrifying liquid which are returned from a gas stripping return pipe 12 of the solid-liquid separation zone, flowing in the micro-aerobic zone II and carrying out denitrification reaction, converting nitrate nitrogen in the mixed liquid into gaseous nitrogen to overflow under the action of denitrifying bacteria, removing ammonia nitrogen, and then enabling the sewage mixed liquid to enter the outer barrel 3 from a water outlet 10. The proper flow rate of the sewage mixed solution in the micro-oxygen area II is not more than 0.1m/s.
And 3, the first aeration device 15 performs oxygen supply aeration on the first aerobic zone I so that the oxygen content in the first aerobic zone I accords with a set range, the sewage mixed solution in the outer barrel 3 performs aerobic nitrification reaction in an aerobic environment of the first aerobic zone I, and ammonia nitrogen in the sewage mixed solution is converted into substances such as nitrate nitrogen and the like under the action of nitrifying bacteria and then enters the second aerobic zone IV. The proper flow rate of the sewage mixed solution in the first aerobic zone I is not more than 0.2m/s.
Step 4, the second aeration device 16 aerates the oxygen supply of the second aerobic zone IV, and after the sewage mixed solution entering from the first aerobic zone I is subjected to aerobic contact reaction in the second aerobic zone IV, the sewage mixed solution is split into two paths while carrying out aerobic biochemical: one path of sewage mixed liquid rises into an inverted V-shaped plate, a gas phase rises into a gas chamber 5 and then into a gas collecting tank 6, liquid phase and part of mud enter a sedimentation zone V in a facing direction, standing and sedimentation are carried out in the sedimentation zone V, the liquid phase rises and is discharged from a water outlet pipe 11 through a water collecting tank 7, the mud phase is statically settled back to a second aerobic zone IV to form mixed liquid, the mixed liquid is collected into the gas collecting tank 6 from the lower part of the gas chamber 5 along with the gas, and then the mixed liquid is gas-stripped and flows back to an anaerobic zone III and a micro-oxygen zone II through a gas stripping return pipe 12 for sewage treatment of the next cycle; the other path of sewage mixed liquid passes through an overflow pump 14 on a partition plate 13 between the outer cylinder 3 and the middle cylinder 2 forward, and returns to the first aerobic zone I under the pushing of circulation. The proper flow rate of the sewage mixed solution in the second aerobic zone IV is not more than 0.2m/s.
The flow of the sewage mixed solution in the micro-oxygen area II and the first aerobic area I is assisted by the overflow pump 14, so that the sewage mixed solution in the micro-oxygen area II and the first aerobic area I flows more stably, is more uniformly mixed and reacts more fully.
In the sewage treatment process, DO concentration in the anaerobic zone III is monitored in real time through a third detector, the control system adjusts the air inflow corresponding to the second aeration device 16 according to the monitoring signal of the third detector, and controls the air stripping reflux quantity of the air stripping reflux pipe 12 connected with the anaerobic zone III, so that the DO value is constantly in the range of 0-0.2mg/L, and a good anaerobic or low-oxygen environment is ensured. The DO concentration in the micro-oxygen area II is monitored in real time through the second detector, the control system adjusts the air inflow corresponding to the second aeration device 16 according to the monitoring signal of the second detector, and controls the air stripping reflux quantity of the air stripping reflux pipe 12 connected with the micro-oxygen area II, and the DO value is kept in the range of 0.2-0.5mg/L so as to ensure good micro-oxygen environment. The adjustment of the intake air amount of the second aeration device 16 may be achieved by controlling the size of the corresponding valve. The DO concentration in the second aerobic zone IV is monitored in real time through the first detector, the control system adjusts the air supply amount of the first aeration device 15 according to the monitoring signal of the first detector, and the DO concentration value of the second aerobic zone IV is indirectly controlled within the range of 0.8-1.5mg/L by keeping the DO concentration of the first aerobic zone I constant within a proper range, so that the sewage mixed solution is subjected to solid-liquid separation in an aerobic environment, and the synchronous carrying out of aerobic biochemical and solid-liquid separation is ensured.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (3)
1. A sewage treatment device with synchronous aerobic biochemical and solid-liquid separation is characterized in that: including a sewage treatment section of thick bamboo, sewage treatment section of thick bamboo includes inner tube (1), well section of thick bamboo (2) and urceolus (3), inner tube (1) is provided with anaerobic zone (III), the inner wall of well section of thick bamboo (2) with be provided with micro-aerobic zone (II) between the outer wall of inner tube (1), the inner wall of urceolus (3) with be provided with first good oxygen district (I) and solid-liquid separation district between the outer wall of well section of thick bamboo (2), first good oxygen district (I) bottom is provided with first aeration equipment (15), the bottom in solid-liquid separation district is provided with second aeration equipment (16), the middle part in solid-liquid separation district is provided with separator (4), form second good oxygen district (IV) between separator (4) and second aeration equipment (16), second good oxygen district (IV) intercommunication first good oxygen district (I), form sedimentation zone (V) between the top in separator (4) and the outer wall of well section of thick bamboo (2), separator (4) are connected with air stripping back flow (12), be equipped with a plurality of back flow (12) and a plurality of aeration back flow units (16) are equipped with a plurality of groups of air stripping back flow (12) and a plurality of aeration equipment (12) are equipped with one-to one another, a plurality of aeration unit (12, the rest of the gas stripping return pipe (12) is communicated with the micro-oxygen area (II); a water outlet pipe (11) is arranged at the upper part of the sedimentation zone (V); the separator (4) comprises a gas collecting tank (6) and at least two layers of inverted V-shaped plates which are arranged in a staggered mode in a spaced mode, a gas chamber (5) is formed below the inverted V-shaped plates, the gas chamber (5) is communicated with the gas collecting tank (6), and the gas collecting tank (6) is connected with the gas stripping return pipe (12);
the sewage treatment process of the sewage treatment equipment comprises the following steps:
step 1, sewage to be treated flows into the bottom of an inner cylinder (1), upward forms upward flow, is uniformly mixed with active bacterial sludge mixed solution which is extracted and returned from a solid-liquid separation zone, and is subjected to anaerobic reaction in an anaerobic zone (III), and sewage after anaerobic reaction overflows into a middle cylinder (2); the DO concentration in the inner cylinder (1) is monitored in real time, the stripping reflux quantity of the mixed liquid is controlled by the second aeration device (16), and the DO value is constant within the range of 0-0.2 mg/L;
step 2, mixing the sewage in the middle cylinder (2) with active bacterial sludge and nitrifying liquid which are extracted and returned from the solid-liquid separation area, carrying out denitrification reaction in the micro-oxygen area (II), converting nitrate nitrogen in the mixed liquid into gaseous nitrogen under the action of denitrifying bacteria to overflow, removing ammonia nitrogen, and then allowing the sewage mixed liquid to enter the outer cylinder (3); the DO concentration in the middle cylinder (2) is monitored in real time, the stripping reflux quantity of the mixed liquid is controlled by the second aeration device (16), and the DO value is constant within the range of 0.2-0.5 mg/L;
step 3, the first aeration device (15) supplies oxygen to the first aerobic zone (I), the sewage mixed solution in the outer cylinder (3) is subjected to an aerobic nitrification reaction in the aerobic environment of the first aerobic zone (I), ammonia nitrogen in the sewage mixed solution is converted into substances such as nitrate nitrogen under the action of nitrifying bacteria, and then the substances enter the second aerobic zone (IV);
step 4, the second aeration device (16) performs oxygen supply aeration on the second aerobic zone (IV), after the sewage mixed liquor of the solid-liquid separation zone performs aerobic contact reaction in the second aerobic zone (IV), the sewage mixed liquor rises to enter the separator (4), solid phase, liquid phase and gas phase three-phase separation is performed under the action of the separator (4), the liquid phase enters the precipitation zone (V) upwards to be discharged from the water outlet pipe (11), solid sludge is statically precipitated and falls back to the second aerobic zone (IV) to form mixed liquor, and the mixed liquor is collected into the gas collecting tank (6) by the separator (4) along with aeration gas, and then is stripped and flows back to the inner cylinder (1) and the middle cylinder (2);
the DO concentration in the second aerobic zone (IV) is monitored in real time, the DO concentration in the first aerobic zone (I) is regulated to be constant in a proper range by the first aeration device (15), and the DO concentration value in the second aerobic zone (IV) is indirectly controlled to be in a range of 0.8-1.5 mg/L.
2. The sewage treatment device with synchronous aerobic biochemical and solid-liquid separation according to claim 1, wherein: the anaerobic treatment device is characterized by further comprising a control system, wherein the second aerobic zone (IV) is provided with a first detector for detecting the dissolved oxygen concentration of the sewage mixed solution, the micro-aerobic zone (II) is provided with a second detector for detecting the dissolved oxygen concentration of the sewage mixed solution, the anaerobic zone (III) is provided with a third detector for detecting the dissolved oxygen concentration of the sewage mixed solution, and the first detector, the second detector and the third detector are respectively and electrically connected with the control system.
3. The sewage treatment device with synchronous aerobic biochemical and solid-liquid separation according to claim 2, wherein: the middle cylinder (2) and the outer cylinder (3) are both provided with a partition plate (13), the partition plate (13) is provided with an overflow pump (14), and the overflow pump (14) is electrically connected with the control system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1884136A (en) * | 2006-06-17 | 2006-12-27 | 中山市环保实业发展有限公司 | Integrated self-reflux multi-stage biochemical sewage treatment device |
| CN204151142U (en) * | 2014-10-17 | 2015-02-11 | 中山环保产业股份有限公司 | A sorting batch biochemical sewage treatment device |
| CN110467263A (en) * | 2019-08-23 | 2019-11-19 | 广州鹏凯环境科技股份有限公司 | A synchronous short-path nitrification and denitrification water treatment device and process |
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| US6592762B2 (en) * | 2001-08-29 | 2003-07-15 | United States Filter Corporation | Process for treating BOD-containing wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1884136A (en) * | 2006-06-17 | 2006-12-27 | 中山市环保实业发展有限公司 | Integrated self-reflux multi-stage biochemical sewage treatment device |
| CN204151142U (en) * | 2014-10-17 | 2015-02-11 | 中山环保产业股份有限公司 | A sorting batch biochemical sewage treatment device |
| CN110467263A (en) * | 2019-08-23 | 2019-11-19 | 广州鹏凯环境科技股份有限公司 | A synchronous short-path nitrification and denitrification water treatment device and process |
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