CN111099788A - Sewage treatment device for enhanced deep nitrogen and phosphorus removal process - Google Patents
Sewage treatment device for enhanced deep nitrogen and phosphorus removal process Download PDFInfo
- Publication number
- CN111099788A CN111099788A CN201811306127.0A CN201811306127A CN111099788A CN 111099788 A CN111099788 A CN 111099788A CN 201811306127 A CN201811306127 A CN 201811306127A CN 111099788 A CN111099788 A CN 111099788A
- Authority
- CN
- China
- Prior art keywords
- tank
- anoxic
- aerobic
- nitrogen
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 98
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 61
- 239000011574 phosphorus Substances 0.000 title claims abstract description 61
- 239000010865 sewage Substances 0.000 title claims abstract description 60
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000010802 sludge Substances 0.000 claims abstract description 57
- 230000003647 oxidation Effects 0.000 claims abstract description 40
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 40
- 238000004062 sedimentation Methods 0.000 claims description 39
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 21
- 238000005273 aeration Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 238000010992 reflux Methods 0.000 claims description 13
- 238000011001 backwashing Methods 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 14
- 241000894006 Bacteria Species 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 244000005700 microbiome Species 0.000 abstract 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 abstract 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 9
- 239000002808 molecular sieve Substances 0.000 description 6
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 6
- 238000005842 biochemical reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 101100314150 Caenorhabditis elegans tank-1 gene Proteins 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2101/105—Phosphorus compounds
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
- C02F3/308—Biological phosphorus removal
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
A sewage treatment device for an enhanced deep nitrogen and phosphorus removal process; the device is characterized in that an anaerobic tank is additionally arranged at the front section on the basis of two stages of AO to form a five-stage AO process with independent functions, an anoxic I tank is designed in an annular gallery mode, and a baffling water inlet and outlet mode is favorable for water body flow without dead angles; the backflow sludge diversion trench and the regulating valve can regulate the amount of the backflow sludge, and the backflow sludge respectively flows back into the anaerobic tank and the anoxic tank I according to the proportion, so that the microorganisms remove backflow nitrate nitrogen by utilizing organic matters and endogenous denitrification in the inflow water, the backflow amount of the anaerobic tank is regulated, the phosphorus release of phosphorus accumulating bacteria is facilitated, a greater potential is provided for phosphorus absorption of an aerobic zone, and the removal rate of total nitrogen in the inflow water is facilitated; the oxidation pond breaks bonds of organic substances in water to open the rings, improves the biodegradability of secondary effluent, and improves the advanced sewage treatment efficiency by utilizing the special properties of the nitrogen removal filter material and the phosphorus removal filter material; the device structural design is reasonable, has effectively got rid of aquatic nitrogen phosphorus, has guaranteed out water quality, and overall arrangement is compact, and area is little, practices thrift the energy consumption.
Description
Technical Field
The invention provides a sewage treatment device for an enhanced deep nitrogen and phosphorus removal process, and belongs to the technical field of sewage treatment environment-friendly equipment.
Background
The nitrogen and phosphorus removal of sewage is always a hotspot of research in the field of water treatment, along with rapid deterioration of water quality and increasing severity of water environment pollution and water eutrophication caused by overhigh content of nitrogen and phosphorus in water, the nitrogen and phosphorus removal of sewage in rural villages and towns puts higher requirements on the treatment degree and discharge standard, particularly on the removal of total nitrogen and total phosphorus, along with the increase of the comprehensive improvement and ecological restoration of the national environment.
At present, an anaerobic-anoxic-aerobic (AAO) process is widely applied to sewage treatment, but the AAO sewage treatment mechanism has the problems that ① the anaerobic zone is adversely affected by nitrate in return sludge due to the front of the anaerobic zone, ② the anoxic zone is positioned in the middle of the system, denitrification is disadvantageously affected in carbon source distribution, the denitrification effect of the system is affected, ③ phosphorus accumulating bacteria in the anaerobic zone absorb phosphorus power to be consumed inefficiently in the anoxic zone, ④ most of microorganisms only experience an anoxic/aerobic alternative environment, and in order to achieve higher denitrification and dephosphorization efficiency, a larger reflux ratio is generally needed, so that the problems of higher investment and energy consumption and the like are caused
At present, in the prior art, AO, A2O, an improved process and the like have the problems of poor denitrification and dephosphorization effect, high energy consumption, long flow, unreasonable layout, poor effluent quality and the like; the process has the problem of competition of phosphorus accumulating bacteria and denitrifying bacteria for carbon sources; the sludge age contradiction of denitrifying bacteria, phosphorus accumulating bacteria and nitrifying bacteria; the influence of nitrate in the return sludge on phosphorus release and the like, so that the application of a simple denitrification technology or a simple phosphorus removal technology is limited to a certain extent, and the treatment effect is difficult to achieve. Therefore, a new process scheme needs to be found, the process technology is improved, nitrogen and phosphorus can be removed simultaneously in one treatment system, and meanwhile, the requirement of high-standard effluent quality is met.
Therefore, it is especially important to search for a high-efficiency and low-energy-consumption advanced nitrogen and phosphorus removal sewage treatment process technology.
Disclosure of Invention
The invention aims to solve the problems and provide a sewage treatment device for an enhanced deep nitrogen and phosphorus removal process; the device is characterized in that an anaerobic tank is additionally arranged at the front section on the basis of two stages of AO, five-stage AO processes with independent functions are formed, the design characteristics of the oxidation ditch process are combined, the anoxic tank I is designed in an annular gallery mode, so that an anaerobic zone and an anoxic zone are circularly arranged, and a baffling water inlet and outlet mode is favorable for water body flowing without dead angles; in addition, the backflow sludge diversion trench and the regulating valve arranged in the device can regulate the flow of the backflow sludge, the backflow sludge respectively flows back to the anaerobic pool and the anoxic I pool according to the proportion, and the mixed liquid in the anoxic pool flows back to the anaerobic pool; the oxidation pond arranged in the device can break bonds of organic substances in water to open the rings, can effectively convert macromolecular organic substances into micromolecular organic substances, improves the biodegradability of secondary effluent, fully utilizes the special properties of a nitrogen removal filter material and a phosphorus removal filter material through a combined process of ozone pre-oxidation and a biological filter, and improves the efficiency of advanced sewage treatment; in addition, the device structural design is reasonable, gets rid of aquatic nitrogen phosphorus more effectively, has guaranteed out water quality, sets up in a flexible way, and the overall arrangement is compact, and area is little, practices thrift the energy consumption, is fit for using widely.
In order to achieve the purpose, the invention is realized by the following technical means:
a sewage treatment device for an enhanced deep nitrogen and phosphorus removal process is characterized in that: comprises an anaerobic tank, an anoxic I tank, an anoxic II tank, an aerobic II tank, an oxidation tank, a denitrification biological filter, a dephosphorization biological filter, a clear water tank, a device room, a sedimentation tank and an aerobic I tank;
a central guide flow cylinder is arranged in the anaerobic tank 1 and is connected with a sewage inlet pipe, a third lifter lifts sludge from the sedimentation tank and flows back to the central guide flow cylinder and the anoxic I tank of the anaerobic tank 1 through a backflow guide groove and a regulating valve, the anaerobic tank 1 is connected with the anoxic I tank through a water outlet weir, a submersible water impeller is arranged in the anaerobic tank, and phosphorus-containing sludge generated by the anaerobic tank is discharged through a second sludge discharge pipe;
the anaerobic tank is designed in an annular gallery mode, surrounds the outer side of the anaerobic tank and is connected with the aerobic tank, the anaerobic tank and the aerobic tank are provided with third flow guide holes, one side of the anaerobic tank is provided with a scum guide pipe, the other side of the anaerobic tank is provided with a fourth lifter and is communicated with a sewage inlet pipe, lifted backflow liquid and raw sewage are mixed and enter a central flow guide cylinder of the anaerobic tank, and a submersible propeller is arranged in the anaerobic tank;
the aerobic I pool is semi-encircled outside the anoxic I pool, an aeration system, a submersible propeller and a first lifter are arranged in the aerobic I pool, the aerobic I pool is connected with the anoxic II pool, a first flow guide hole is arranged between the aerobic I pool and the anoxic II pool, and a sedimentation pool is arranged on one side of the aerobic I pool;
the anoxic II tank and the aerobic II tank are semi-encircled at the other outer side of the anoxic I tank, a reflux groove and a submersible propeller are arranged in the anoxic II tank, the anoxic II tank is connected with the aerobic II tank, and a second flow guide hole is arranged between the anoxic II tank and the aerobic II tank;
the aerobic II tank is internally provided with a first water collecting weir, an aeration system, a second lifter, a reflux groove and a submersible propeller; the second lifter lifts liquid to enter the anoxic II tank through the reflux groove, and the aerobic II tank is connected with the sedimentation tank through the first water collecting weir, the water inlet flow guide pipe and the central cylinder.
The central guide cylinder is provided with a return sludge distribution groove, one end of the return sludge distribution groove penetrates through the central guide cylinder to be connected with the return sludge guide groove, and one end of the return sludge guide groove penetrates into the sedimentation tank to be connected with the third lifter.
The sedimentation tank in the periphery be provided with the second weir that catchments, be provided with a central section of thick bamboo, honeycomb duct, third lifting mechanism of intaking in the sedimentation tank, a central section of thick bamboo is connected with the honeycomb duct of intaking, first mud pipe is linked together with sedimentation tank bottom mud bucket, the sedimentation tank is connected with the oxidation pond through first outlet pipe, sedimentation tank one side is provided with oxidation pond, denitrogenation biological filter, packs the swash plate filler in the sedimentation tank.
The oxidation pond in be provided with ozone aeration system, the oxidation pond is connected with the biological filter of denitrogenation, is provided with the second outlet pipe between oxidation pond and the biological filter of denitrogenation.
And a second water outlet pipe and a first backwashing water drain pipe are arranged in the nitrogen removal biological filter, and the nitrogen removal biological filter is connected with the phosphorus removal biological filter through a third water outlet pipe.
And a third water outlet pipe and a second backwashing water outlet pipe are arranged in the dephosphorization biofilter, and the dephosphorization biofilter is connected with the clean water tank through a fourth water outlet pipe.
The clean water tank is internally provided with a back flush water pump, the clean water tank is connected with the nitrogen removal biological filter and the phosphorus removal biological filter through the back flush water pump, one side of the clean water tank is provided with a clean water outlet pipe, and the other side of the clean water tank is provided with an equipment room.
And a blower, a water pump, an ozone generator and a PLC control system are arranged in the equipment room.
The ozone oxidation in the oxidation pond adopts micro-bubbles, and the diameter of the micro-bubbles is 40-45 mu m.
The adding amount of ozone in the oxidation pond is 6-20mg/L, and the removal rate of uv254 and chromaticity in effluent is 30-50% and 60-80% respectively.
The invention mainly has the following beneficial effects:
1. the device is based on two-stage AO, and the anterior segment adds the anaerobism pond, forms five sections AO technologies of each function, combines oxidation ditch process design characteristics, and the oxygen deficiency I pond is annular corridor formula design, makes anaerobic zone, anoxic zone be circular arrangement, and baffling is advanced, the play water mode is favorable to the water body to flow no dead angle.
2. The device is provided with the return sludge diversion trench and the regulating valve, which can return the amount of sludge and respectively return the sludge into the anaerobic tank and the anoxic I tank according to the proportion, and the mixed liquid in the anoxic tank returns the anaerobic tank.
3. The oxidation pond that the device set up can make aquatic organic matter broken bond ring-opening, can effectually turn into the micromolecule organic matter with the macromolecule organic matter, improves the biodegradability that the second grade goes out water, through the combined process of ozone preoxidation and biological filter, and the special properties of make full use of denitrogenation filter material and dephosphorization filter material improve the efficiency of sewage advanced treatment.
4. The device structural design is reasonable, gets rid of aquatic nitrogen phosphorus more effectively, has guaranteed out water quality, sets up in a flexible way, and the overall arrangement is compact, and area is little, practices thrift the energy consumption, is fit for using widely.
Drawings
FIG. 1 is a schematic structural diagram of a sewage treatment plant for an enhanced advanced nitrogen and phosphorus removal process.
FIG. 2 is a schematic structural diagram of a central guide cylinder of the sewage treatment device for the enhanced deep nitrogen and phosphorus removal process.
As shown in fig. 1-2, the various parts of the figure are represented by the following arabic numerals:
an anaerobic tank-1, an aeration system-2, a submersible propeller-3, a first lifter-4, a first diversion hole-5, a reflux tank-6, an anoxic tank I-7, a water outlet weir-8, an anoxic tank II-9, a reflux sludge distribution tank-10, a second diversion hole-11, a sewage inlet pipe-12, a third diversion hole-13, a second lifter-14, an aerobic tank II-15, a first water collecting weir-16, a first water outlet pipe-17, an oxidation tank-18, a second water outlet pipe-19, a denitrification biological filter-20, a first backwashing water outlet pipe-21, a third water outlet pipe-22, a second backwashing water outlet pipe-23, a dephosphorization biological filter-24, a fourth water outlet pipe-25, a clear water tank-26, a clear water outlet pipe-27, a nitrogen removal biological filter-20, a first backwashing water outlet, The device comprises a device room-28, a second water collecting weir-29, a central cylinder-30, a first sludge discharge pipe-31, a water inlet guide pipe-32, a third lifter-33, a sedimentation tank-34, a return sludge guide groove-35, an adjusting valve-36, an aerobic I tank-37, a scum guide pipe-38, a central guide cylinder-39, a second sludge discharge pipe-40 and a fourth lifter-41.
The invention is described in further detail below with reference to examples and the accompanying drawings of the specification:
Detailed Description
Examples
As shown in fig. 1-2, a sewage treatment device for enhanced deep nitrogen and phosphorus removal process comprises an anaerobic tank 1, an anoxic tank I7, an anoxic tank II 9, an aerobic tank II 15, an oxidation tank 18, a nitrogen removal biological filter 20, a phosphorus removal biological filter 24, a clean water tank 26, an equipment room 28, a sedimentation tank 34, and an aerobic tank I37;
a central guide flow cylinder 39 is arranged in the anaerobic tank 1, the central guide flow cylinder 39 is connected with the sewage inlet pipe 12, the third lifter 33 lifts sludge and flows back to the central guide flow cylinder 39 and the anoxic I tank 7 of the anaerobic tank 1 through the backflow guide groove 35 and the adjusting valve 36 of the sedimentation tank 34, the anaerobic tank 1 is connected with the anoxic I tank 7 through a water outlet weir 8, a submersible water impeller is arranged in the anaerobic tank 1, and phosphorus-containing sludge generated by the anaerobic tank 1 is discharged through a second sludge discharge pipe 40;
the anoxic I tank 7 is designed in an annular gallery mode, surrounds the outer side of the anaerobic tank 1 and is connected with the aerobic I tank 37, the anoxic I tank 7 and the aerobic I tank 37 are provided with third flow guide holes 13, one side of the anoxic I tank 7 is provided with a scum guide pipe 38, the other side of the anoxic I tank 7 is provided with a fourth lifter 41 communicated with the sewage inlet pipe 12, lifted reflux liquid and raw sewage are mixed and enter a central flow guide cylinder 39 of the anaerobic tank 1, and a submersible propeller 3 is arranged in the anoxic I tank 7;
the aerobic I tank 37 is semi-encircled outside the anoxic I tank 7, an aeration system 2, a submersible propeller 3 and a first lifter 4 are arranged in the aerobic I tank 37, the aerobic I tank 37 is connected with the anoxic II tank 9, a first flow guide hole 5 is arranged between the aerobic I tank 37 and the anoxic II tank 9, and a sedimentation tank 34 is arranged on one side of the aerobic I tank 37;
the anoxic II tank 9 and the aerobic II tank 15 are semi-encircled at the other outer side of the anoxic I tank 7, a reflux groove 6 and a submersible propeller 3 are arranged in the anoxic II tank 9, the anoxic II tank 9 is connected with the aerobic II tank 15, and a second flow guide hole 11 is arranged between the anoxic II tank 9 and the aerobic II tank 15;
a first water collecting weir 16, an aeration system 2, a second lifter 14, a reflux groove 6 and a submersible propeller 3 are arranged in the aerobic II tank 15; the liquid lifted by the second lifter 14 enters the anoxic II tank 9 through the reflux groove 6, and the aerobic II tank 15 is connected with the sedimentation tank 34 through the first water collecting weir 16, the water inlet guide pipe 32 and the central cylinder 30.
The central guide shell 39 is provided with a return sludge distribution groove 10, one end of the return sludge distribution groove 10 penetrates through the central guide shell 39 to be connected with the return sludge guide groove 35, and one end of the return sludge guide groove 35 penetrates into the sedimentation tank 34 to be connected with the third lifter 33.
The inner periphery of the sedimentation tank 34 is provided with a second water collecting weir 29, the sedimentation tank 34 is internally provided with a central cylinder 30, a water inlet guide pipe 32 and a third lifter 33, the central cylinder 30 is connected with the water inlet guide pipe 32, a first sludge discharge pipe 31 is communicated with a sludge hopper at the bottom of the sedimentation tank 34, the sedimentation tank 34 is connected with the oxidation tank 18 through a first water outlet pipe 17, one side of the sedimentation tank 34 is provided with the oxidation tank 18 and the nitrogen removal biological filter 20, and the sedimentation tank 34 is filled with inclined plate filler.
An ozone aeration system is arranged in the oxidation pond 18, the oxidation pond 18 is connected with a nitrogen removal biological filter 20, and a second water outlet pipe 19 is arranged between the oxidation pond 18 and the nitrogen removal biological filter 20.
A second water outlet pipe 19 and a first backwashing water outlet pipe 21 are arranged in the nitrogen removal biological filter 20, and the nitrogen removal biological filter 20 is connected with a phosphorus removal biological filter 24 through a third water outlet pipe 22.
A third water outlet pipe 22 and a second backwashing water outlet pipe 23 are arranged in the dephosphorization biofilter 24, and the dephosphorization biofilter 24 is connected with a clean water tank 26 through a fourth water outlet pipe 25.
A back flush water pump is arranged in the clean water tank 26, the clean water tank 26 is connected with the nitrogen removal biological filter 20 and the phosphorus removal biological filter 24 through the back flush water pump, a clean water outlet pipe 27 is arranged on one side of the clean water tank 26, and an equipment room 28 is arranged on the other side of the clean water tank 26.
And a blower, a water pump, an ozone generator and a PLC control system are arranged in the equipment room 28.
The ozone oxidation in the oxidation pond 18 adopts micro-bubbles, and the diameter of the micro-bubbles is 40-45 μm.
The adding amount of the ozone in the oxidation pond 18 is 6-20mg/L, and the removal rate of uv254 and chroma in the effluent is 30-50% and 60-80% respectively.
The ozone catalyst filled in the oxidation pond 18 is prepared by using a compound porous substance as a carrier and multiple rare earth metal oxides and transition metal oxides as catalytic components through carrier doping, extrusion forming, mixed impregnation, low-temperature drying, high-temperature roasting and other processes, the generation amount of hydroxyl radicals is increased, the ozone oxidation capacity is greatly enhanced, the ozone oxidation effect is improved, the decomposition efficiency is increased by 2-4 times compared with that of pure ozone oxidation, the pH value under the water inlet condition is 4.0-10.0, and the total hardness and alkalinity of inlet water are less than 1500 mg/L.
The denitrification biological filter material in the denitrification biological filter 20 is a porous aluminosilicate mineral substance containing a water frame structure, has a large specific surface area (up to 500-1100 m2/g), and unique ion exchange capacity, electrostatic attraction and adsorption capacity, and has a high ammonia nitrogen removal rate of 2-4mm in particle size, a flow rate of 3-4 m/h, a bed height of more than 1-1.5 m and an ammonia nitrogen removal rate of more than 90% under the condition of PH 7-9.
The biological phosphorus removal filter material in the biological phosphorus removal filter 24 is formed by compounding natural ores and porous filter materials, can prevent the hardening of a single filter material and reduce the head loss, and has the adsorption capacity of the biological phosphorus removal filter material on phosphorus of more than or equal to 9.0mg/g, the particle size of 1-2mm, the flow speed of 6 m/h, the bed height of more than 1.2-1.5 m and the phosphorus removal rate of more than 89% under the condition of PH 5-7.
The method for treating sewage by the device comprises the following steps: the pretreated sewage and the sewage lifted by the internal circulation fourth lifter 41 are mixed and then enter the bottom of the anaerobic tank 1 through the water inlet pipe 12 and the central guide cylinder 39, and the sewage turns over, swirls, floats upwards in a mixed manner under the action of the submersible water impeller and enters the anoxic I tank 7 through the effluent weir 8; under the action of the submersible propeller 3, sewage is mixed in the gallery of the anoxic I pool 7 to form rotational flow, and the rotational flow enters the aerobic I pool 37 through the third flow guide hole 13; meanwhile, after part of the return sludge in the sedimentation tank 34 is lifted by the third lifter 33, the return sludge enters the anaerobic tank 1 and the anoxic I tank 7 respectively through the return sludge diversion trench 35 and the regulating valve 36, and part of the return sludge and sewage inflow water are completely mixed in the anaerobic tank 1 to carry out biochemical reaction and enter the anoxic I tank 7;
in the anoxic II tank 9, partial return sludge of the sedimentation tank, inflow water of the anaerobic tank 1 and return sewage of nitrifying liquid are completely mixed, biochemical reaction is carried out to remove ammonia nitrogen, then the mixture enters the aerobic I tank 37, and scum in the tank is discharged through a scum guide pipe 38; in the aerobic I pool 37, the mixed liquid is completely mixed in the aeration system 2 and the submersible propeller 3 to carry out biochemical reaction and degrade organic matters, the nitrified liquid flows back through the first lifter 4 and enters the anoxic I pool 7, and the mixed sewage enters the anoxic II pool 9 through the first diversion holes 5; in the anoxic II tank 9, the sewage and the nitrified liquid in the aerobic II tank 15 flow back to the sewage, the sewage is completely mixed by the submersible propeller 3 to further carry out biochemical reaction to remove ammonia nitrogen, the effluent enters the aerobic II tank 15 through the second flow guide hole 11, is completely mixed by the aeration system 2 and the submersible propeller 3 to further carry out biochemical reaction to remove organic matters, and the effluent enters the sedimentation tank 34 through the first water collecting weir 16 and the water inlet guide pipe 32 and the central cylinder 30;
in the sedimentation tank 34, the mixed sewage is subjected to mud-water separation, part of the sludge is lifted by a third lifter 33, passes through a return sludge diversion trench 35 and a regulating valve 36, part of the sludge flows back to the anaerobic tank 1, part of the sludge flows back to the anoxic I tank 7, and the rest of the sludge is discharged through a first sludge discharge pipe 31;
the supernatant enters the pre-oxidation tank 18 through the second water collecting weir 29 and the first water outlet pipe 17, the sewage is pre-oxidized by ozone to remove macromolecular organic matters, and the sewage is lifted to the nitrogen removal biological filter 20 through the sewage lifting system after the biochemical performance is changed;
filling a nitrogen removal biological filter material in the nitrogen removal biological filter 20 to further remove ammonia nitrogen in water, and enabling outlet water to enter a phosphorus removal biological filter 24 through a second water outlet pipe 19;
a biological filter material for removing phosphorus is filled in the biological filter 24 for removing phosphorus, and the effluent enters a clean water tank 26 through a fourth water outlet pipe 25;
the clean water tank 26 stores clean water to meet the requirement of backwashing water of the two-stage biofilters, sewage after backwashing is discharged through a sewage discharge pipe, and the clean water is discharged out through a clean water outlet pipe 27 or is recycled as reclaimed water;
the equipment room 28 is internally provided with aeration blowers, biological filter backwashing water pumps, a PLC intelligent control system and other equipment required by the aerobic tank and the oxidation tank;
in the above treatment method, pretreated sewage and sewage in an anoxic I tank are lifted by a fourth lifter 41 and enter the bottom of an anaerobic tank 1 through a central cylinder 30, the sewage returned by a sedimentation tank 34 passes through a return sludge diversion trench 35 and an adjusting valve 36 to adjust the amount of return sludge, 20-30% of part of the return sludge returns to the anaerobic tank 1 and enters an anoxic I tank 7 after being mixed with raw sewage, 70-80% of the other part of the return sludge returns to the anoxic I tank 7 and returns to the sewage with nitrified liquid in an aerobic I tank 37, and three strands of water are completely mixed, so that the return distribution can avoid bringing a large amount of NO3- (NO2-) back to the anaerobic tank 1, provide conditions for releasing phosphorus from the sludge, namely nitrate is less than 0.1mg/L, ensure the effective release of phosphorus by phosphorus accumulating bacteria, and improve the phosphorus absorption effect of the phosphorus accumulating bacteria in an aerobic section; the organic matters are effectively degraded, and meanwhile, the phosphorus accumulating bacteria and the denitrifying bacteria have enough organic nutrients, so that the aim of synchronously removing phosphorus and nitrogen in the system is fulfilled;
the diameter of micro-bubble bubbles is 40-45 μm for ozone oxidation, and when the ozone addition amount is 6-20mg/L, the removal rate of uv254 and chromaticity in the effluent is 30-50% and 60-80% respectively;
in the biological filter unit, an active molecular sieve filter material is adopted, ammonia nitrogen is attracted to the surface of a molecular sieve to be close to the surface of the molecular sieve by utilizing the surface dispersion force, the electrostatic force and the ion exchange action of the molecular sieve, the ammonia nitrogen is pushed to permeate from the surface of the molecular sieve to the inside by the capillary force and the ion exchange action, the ammonia nitrogen is continuously scattered inside the molecular sieve and is exchanged with Na and other ions, the height of a filter bed is more than 1.2-1.5 m, the running flow rate is 3-4 m/h, and the ammonia nitrogen removal capacity is more than 80-95%.
It should be noted that: the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sewage treatment device for an enhanced deep nitrogen and phosphorus removal process is characterized in that: comprises an anaerobic tank (1), an anoxic I tank (7), an anoxic II tank (9), an aerobic II tank (15), an oxidation tank (18), a denitrogenation biological filter (20), a dephosphorization biological filter (24), a clean water tank (26), an equipment room (28), a sedimentation tank (34) and an aerobic I tank (37);
a central guide flow cylinder (39) is arranged in the anaerobic tank (1), the central guide flow cylinder (39) is connected with a sewage inlet pipe (12), a third lifter (33) lifts sludge and distributes flow from the sedimentation tank (34) through a backflow guide groove (35) and an adjusting valve (36) to respectively flow back to the central guide flow cylinder (39) and the anoxic I tank (7) of the anaerobic tank (1), the anaerobic tank (1) is connected with the anoxic I tank (7) through a water outlet weir (8), a submersible water impeller is arranged in the anaerobic tank (1), and phosphorus-containing sludge generated by the anaerobic tank (1) is discharged through a second sludge discharge pipe (40);
the anaerobic tank I (7) is designed in an annular gallery mode, surrounds the outer side of the anaerobic tank (1) and is connected with the aerobic tank I (37), third flow guide holes (13) are formed in the anaerobic tank I (7) and the aerobic tank I (37), a scum guide pipe (38) is arranged on one side of the anaerobic tank I (7), a fourth lifter (41) is arranged on the other side of the anaerobic tank I (7) and is communicated with a sewage inlet pipe (12), lifted return liquid and raw sewage are mixed and enter a central flow guide cylinder (39) of the anaerobic tank (1), and a submersible propeller (3) is arranged in the anaerobic tank I (7);
the aerobic I pool (37) is semi-encircled outside the anoxic I pool (7), an aeration system (2), a submersible propeller (3) and a first lifter (4) are arranged in the aerobic I pool (37), the aerobic I pool (37) is connected with the anoxic II pool (9), a first flow guide hole (5) is arranged between the aerobic I pool (37) and the anoxic II pool (9), and a sedimentation pool (34) is arranged on one side of the aerobic I pool (37);
the anoxic II tank (9) and the aerobic II tank (15) are semi-encircled at the other outer side of the anoxic I tank (7), a reflux groove (6) and a submersible propeller (3) are arranged in the anoxic II tank (9), the anoxic II tank (9) is connected with the aerobic II tank (15), and a second flow guide hole (11) is arranged between the anoxic II tank (9) and the aerobic II tank (15);
a first water collecting weir (16), an aeration system (2), a second lifter (14), a reflux groove (6) and a submersible propeller (3) are arranged in the aerobic II tank (15); the second lifter (14) lifts liquid to enter the anoxic II tank (9) through the reflux groove (6), and the aerobic II tank (15) is connected with the sedimentation tank (34) through the first water collecting weir (16), the water inlet guide pipe (32) and the central cylinder (30).
2. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant as claimed in claim 1, wherein: a return sludge distribution groove (10) is arranged on the central guide shell (39), one end of the return sludge distribution groove (10) penetrates through the central guide shell (39) to be connected with the return sludge guide groove (35), and one end of the return sludge guide groove (35) penetrates into the sedimentation tank (34) to be connected with the third lifter (33).
3. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant as claimed in claim 2, wherein: the inner periphery of the sedimentation tank (34) is provided with a second water collecting weir (29), the sedimentation tank (34) is internally provided with a central cylinder (30), a water inlet guide pipe (32) and a third lifter (33), the central cylinder (30) is connected with the water inlet guide pipe (32), a first sludge discharge pipe (31) is communicated with a sludge hopper at the bottom of the sedimentation tank (34), the sedimentation tank (34) is connected with an oxidation tank (18) through a first water outlet pipe (17), one side of the sedimentation tank (34) is provided with the oxidation tank (18) and a nitrogen removal biological filter (20), and the sedimentation tank (34) is filled with inclined plate filler.
4. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant according to claim 3, wherein: an ozone aeration system is arranged in the oxidation pond (18), the oxidation pond (18) is connected with the nitrogen removal biological filter (20), and a second water outlet pipe (19) is arranged between the oxidation pond (18) and the nitrogen removal biological filter (20).
5. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant of claim 4, wherein: a second water outlet pipe (19) and a first backwashing water outlet pipe (21) are arranged in the nitrogen removal biological filter (20), and the nitrogen removal biological filter (20) is connected with a phosphorus removal biological filter (24) through a third water outlet pipe (22).
6. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant according to claim 5, wherein: a third water outlet pipe (22) and a second backwashing water outlet pipe (23) are arranged in the dephosphorization biofilter (24), and the dephosphorization biofilter (24) is connected with a clean water tank (26) through a fourth water outlet pipe (25).
7. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant of claim 6, wherein: a back flush water pump is arranged in the clean water tank (26), the clean water tank (26) is connected with the nitrogen removal biological filter (20) and the phosphorus removal biological filter (24) through the back flush water pump, a clean water outlet pipe (27) is arranged on one side of the clean water tank (26), and an equipment room (28) is arranged on the other side of the clean water tank (26).
8. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant of claim 7, wherein: an air blower, a water pump, an ozone generator and a PLC control system are arranged in the equipment room (28).
9. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant according to claim 3 or 4, wherein: the ozone in the oxidation pond (18) is oxidized by micro-bubbles, and the diameters of the micro-bubbles are 40-45 mu m.
10. The enhanced advanced nitrogen and phosphorus removal process sewage treatment plant of claim 9, wherein: the adding amount of the ozone in the oxidation pond (18) is 6-20mg/L, and the removal rate of uv254 and chroma in the effluent is 30-50% and 60-80% respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811306127.0A CN111099788A (en) | 2018-10-26 | 2018-10-26 | Sewage treatment device for enhanced deep nitrogen and phosphorus removal process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811306127.0A CN111099788A (en) | 2018-10-26 | 2018-10-26 | Sewage treatment device for enhanced deep nitrogen and phosphorus removal process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111099788A true CN111099788A (en) | 2020-05-05 |
Family
ID=70419928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811306127.0A Pending CN111099788A (en) | 2018-10-26 | 2018-10-26 | Sewage treatment device for enhanced deep nitrogen and phosphorus removal process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111099788A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200229765Y1 (en) * | 2001-01-22 | 2001-07-03 | 아성 엔.엠.티 주식회사 | Disposal plant of sewage and waste water contained bioceramic media for nitrogen and phosphorus |
| CN101041509A (en) * | 2007-04-24 | 2007-09-26 | 上海亚同环保实业有限公司 | Circulation flow ring-shaped biological denitrification phosphorous removal technique |
| CN101891344A (en) * | 2010-07-13 | 2010-11-24 | 重庆大学 | Activated sludge-biomembrane combined circulating flow denitrification and desophorization integrated sewage treatment device and method |
| CN202688153U (en) * | 2012-07-26 | 2013-01-23 | 中国水利水电第十三工程局有限公司 | Deep treatment device of municipal sewage |
| CN103755023A (en) * | 2013-12-13 | 2014-04-30 | 盐城工学院 | Novel immobilized microorganism biochemical precipitation integrated reactor |
| CN103755103A (en) * | 2014-01-24 | 2014-04-30 | 广州市市政工程设计研究院 | LCD (liquid crystal display) industrial wastewater advanced treatment technology |
| CN106517678A (en) * | 2016-12-29 | 2017-03-22 | 华南理工大学 | Rural domestic wastewater integrated processing device and technology |
| CN107792999A (en) * | 2017-12-11 | 2018-03-13 | 北京北排科技有限公司 | A kind of decentralized type sewage advanced treating denitrification dephosphorization apparatus and its application method |
| CN207294513U (en) * | 2017-08-28 | 2018-05-01 | 环境保护部华南环境科学研究所 | A kind of sewage plant tail water peer is discharged into processing system |
| CN209226777U (en) * | 2018-10-26 | 2019-08-09 | 河北恒特环保工程有限公司 | A kind of reinforcing advanced nitrogen dephosphorization process sewage-treatment plant |
-
2018
- 2018-10-26 CN CN201811306127.0A patent/CN111099788A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200229765Y1 (en) * | 2001-01-22 | 2001-07-03 | 아성 엔.엠.티 주식회사 | Disposal plant of sewage and waste water contained bioceramic media for nitrogen and phosphorus |
| CN101041509A (en) * | 2007-04-24 | 2007-09-26 | 上海亚同环保实业有限公司 | Circulation flow ring-shaped biological denitrification phosphorous removal technique |
| CN101891344A (en) * | 2010-07-13 | 2010-11-24 | 重庆大学 | Activated sludge-biomembrane combined circulating flow denitrification and desophorization integrated sewage treatment device and method |
| CN202688153U (en) * | 2012-07-26 | 2013-01-23 | 中国水利水电第十三工程局有限公司 | Deep treatment device of municipal sewage |
| CN103755023A (en) * | 2013-12-13 | 2014-04-30 | 盐城工学院 | Novel immobilized microorganism biochemical precipitation integrated reactor |
| CN103755103A (en) * | 2014-01-24 | 2014-04-30 | 广州市市政工程设计研究院 | LCD (liquid crystal display) industrial wastewater advanced treatment technology |
| CN106517678A (en) * | 2016-12-29 | 2017-03-22 | 华南理工大学 | Rural domestic wastewater integrated processing device and technology |
| CN207294513U (en) * | 2017-08-28 | 2018-05-01 | 环境保护部华南环境科学研究所 | A kind of sewage plant tail water peer is discharged into processing system |
| CN107792999A (en) * | 2017-12-11 | 2018-03-13 | 北京北排科技有限公司 | A kind of decentralized type sewage advanced treating denitrification dephosphorization apparatus and its application method |
| CN209226777U (en) * | 2018-10-26 | 2019-08-09 | 河北恒特环保工程有限公司 | A kind of reinforcing advanced nitrogen dephosphorization process sewage-treatment plant |
Non-Patent Citations (2)
| Title |
|---|
| 环境保护部污染物排放总量控制司组织编写: "《城镇分散型水污染物减排实用技术汇编》", 31 January 2009, 中国环境科学出版社, pages: 34 * |
| 胡纪萃: "《废水厌氧生物处理理论与技术》", 31 May 2003, 中国建筑工业出版社, pages: 258 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205821108U (en) | A kind of integration MBR sewage disposal device | |
| CN102627353B (en) | Nitration denitrificatoin and filter method for double-sludge series-connection aeration biofilter, and nitration denitrification and filter device | |
| CN103373794A (en) | Sewage treatment process and special-purpose one-piece sewage treatment plant | |
| CN102775025A (en) | Municipal life wastewater treatment system with high efficiency and low energy consumption | |
| CN104512963B (en) | A kind of multistage simultaneous nitrification-denitrification biofilm system denitrogenation method of integral type and device | |
| CN209226777U (en) | A kind of reinforcing advanced nitrogen dephosphorization process sewage-treatment plant | |
| CN109607788A (en) | One kind being based on modified form A2The rural decentralized wastewater integrated processing system of/O and MBR technology | |
| CN218910039U (en) | Efficient mud membrane symbiotic denitrification and dephosphorization sewage treatment system | |
| CN114634276A (en) | Nitrogen and phosphorus removal integrated rural domestic sewage treatment system and treatment method thereof | |
| CN205382058U (en) | Miniature integrated domestic sewage treatment equipment | |
| CN107285559A (en) | A kind of integrated ozone coupling ceramic membrane membrane bioreactor and handling process | |
| CN114262058A (en) | Double-circulation double-sedimentation-tank integrated biological treatment device and method | |
| CN208104176U (en) | A kind of container combined type flowing carrier type sewage disposal device | |
| CN104108831B (en) | A kind of Waste Water Treatment Methods for Restaurants and device | |
| CN109775936B (en) | Low-energy-consumption domestic sewage treatment system | |
| CN219156733U (en) | Rural sewage treatment plant of low energy consumption | |
| CN1300016C (en) | River late water purification method and its special flowing aeration equipment | |
| CN107954516A (en) | Circulation improvement A/O integrated sewage disposal techniques in one kind four | |
| CN204298147U (en) | The multistage SND nitrogen rejection facility of a kind of integral type | |
| CN201313854Y (en) | Hypoxia/aerobic integrated air lift circulation biological reactor | |
| CN116143352A (en) | Full-quantification combined treatment system and method for landfill leachate | |
| CN109231712A (en) | A kind of A2O2The micro-integrated sewage disposal device of+Anammox and sewage water treatment method | |
| CN203033860U (en) | Micro-aerobic expansion particle sludge bed- steel slag biological aerated filter sewage treatment system | |
| CN110282825A (en) | A kind of method for treating garbage percolation liquid and system | |
| CN205473187U (en) | Small -size integrated domestic sewage treatment equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |