CN203112653U - Soybean product wastewater biochemical treatment device - Google Patents
Soybean product wastewater biochemical treatment device Download PDFInfo
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- CN203112653U CN203112653U CN201220706016.0U CN201220706016U CN203112653U CN 203112653 U CN203112653 U CN 203112653U CN 201220706016 U CN201220706016 U CN 201220706016U CN 203112653 U CN203112653 U CN 203112653U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model relates to a soybean product wastewater biochemical treatment device. Wastewater treatment steps and the wastewater treatment device comprise: wastewater sequentially flows through a regulating tank, a hydrolysis acidification tank, an anaerobic tank, a biological synchronization degradation tank and a mud-water separation device, wherein the hydrolysis acidification tank is used for hydrolyzing particulate matters and macromolecules into soluble matters and degrading COD (Chemical Oxygen Demand); the anaerobic tank is used for degrading the COD while producing methane; the biological synchronization degradation tank is used for synchronously degrading the COD and N by adopting the aeration of low dissolved oxygen; mixture liquor at the tail end of the biological synchronization degradation tank flows back to a water inlet end, and a part of mixture liquor is lifted to the mud-water separation device; clear water separated from mud is emitted after achieving the standard, and the mud flows back to the water inlet end of the hydrolysis acidification tank; and excess mud is discharged into a mud treatment system. The soybean product wastewater biochemical treatment device has the beneficial effects that COD and N are degraded by adopting the biochemical treatment technique and biological synchronization, the treated effluent water achieves the primary discharge standard of integrated wastewater discharge standard (GB8978-1996), and the problems that the N exceeds the standard, the mud amount is large and the cost is high in treating wastewater of soybean products can be solved.
Description
Technical field
The utility model relates to a kind of wastewater treatment equipment, specifically refers to the soybean wastewater biochemical treatment apparatus, is to utilize degrade the synchronously device of soybean wastewater COD and N of microorganism.
Background technology
Soybean wastewater is that soya bean is processed into the waste water that produces in the process of bean products.Soybean wastewater is mainly formed to be had: yellow swill, immersion water, flushing waste water; Soybean wastewater principal pollutant composition has: bean dregs, grease, protein and fiber polysaccharide etc.The soybean wastewater principal feature is: COD and N's is dense, the COD of comprehensive wastewater
Cr5500～10000mg/L, BOD
53000～5000mg/L, total nitrogen 200～500mg/L.Soybean wastewater is handled not qualified discharge, will cause body eutrophication, influences its economic worth and social value.
Soybean wastewater is handled, and most widely used technology is " settling tank or air flotation pool+anaerobic pond+Aerobic Pond+air flotation pool " at present, handles back water outlet COD
Cr100～200mg/L, ammonia nitrogen 40～90mg/L.(GB8978-1996) first discharge standard of contrast " integrated wastewater discharge standard ", COD and N exceed standard, and particularly the N phenomenon that exceeds standard is commonplace, and sludge volume is big in the wastewater treatment process, the processing cost height.Its major technique reason is:
Traditional A/O technology and extension apparatus thereof are handled high concentration COD and N and the soybean wastewater deposited, and limitation is very big: the one, and nitrification and denitrification places different spaces or time, causes technical process long, and waste water is at BOD
5Be degraded to certain value following (30mg/L), just carry out nitration reaction, need the biochemistry pool volume of configuration big, the wastewater treatment under-capitalization will cause removal efficient not reach design requirements; The 2nd, the biological denitrificaion restraining factors are many, and total nitrogen is removed efficient low (less than 80%), cause and handle back water outlet N index exceeding standard.
The grease of soybean wastewater and SS content are very high, can cause obstruction or the damage of follow-up anaerobic pond triphase separator, therefore before biochemical treatment, utilize materialization precipitation or air floating method, remove grease and SS, make water quality satisfy the water inlet requirement of triphase separator, this just produces a large amount of mud, and sludge components mainly is grease and materialization flco, 4～8 tons of mud of sludge discharge/kiloton waste water (water ratio～80%).
In wastewater treatment process, add medicaments such as lime, coagulating agent, PAM, liquid caustic soda, cause medicament expense to increase and the increase of sludge disposal expense, generally reflect 2.5～3.0 yuan of/ton waste water of wastewater treatment expense.
Synchronous nitration and denitrification theory (SND) and low oxygen dissolving control technology, provide new theoretical basis and technique means to biological denitrificaion, also produced simultaneously corresponding biological denitrification apparatus, last century, country such as the nineties Holland and Belgium researched and developed corresponding CANON technology and device and OLAND technology and device.Its core is: biochemistry pool control low dissolved axygen environment, in biochemistry pool, realize short distance nitration and biochemical reactions such as Anammox, aerobic nitrification and aerobic denitrification, namely with the pond simultaneous denitrification.(0.1～0.5mg/L), when high concentration COD and N and the soybean wastewater deposited were handled, the degradation efficiency of COD and N was not ideal enough but because the low dissolved oxygen scope of these technologies and device control is narrow.
The utility model content
In order to overcome the defective of said apparatus, the soybean wastewater biochemical treatment apparatus that the utility model provides, when high concentration COD and N and the soybean wastewater deposited are handled, by aeration mode and the low dissolved oxygen scope of raising of improving biological simultaneous denitrification technology, on the basis with the pond simultaneous denitrification, strengthen the COD degradation function, realize that COD and N degrade synchronously with the pond.
Soybean wastewater biochemical treatment apparatus of the present utility model, waste water flow through equalizing tank, hydrolysis acidification pool, anaerobic pond, biological degraded synchronously pond, sludge disposal system;
Described equalizing tank is provided with mechanical grille machine and web plate Microfilter,
Described hydrolysis acidification pool is selected for use compound anaerobic fluidized bedly, and the top arranges waste gas disposal system, and top arranges inclined tube or swash plate, the middle biologic packing material of hanging, and the bottom arranges bucket and spoil disposal pipeline; Device for separating mud and water is selected ultra-filtration membrane for use;
Described anaerobic pond, select for use anaerobic expanded granular sludge bed, the high 13～15m in pond, Chi Dingyou lid, the top arranges collecting methane, processing, use device; Supporting liquid caustic soda adds the robot control system(RCS) with pH; Anaerobic pond is the bottom water inlet; The water part promotes circulation with pump, and the water circulating pump lift is greater than 24m;
The described biology pond of degrading synchronously, the feed-water end of aeration zone adopt the multiple spot water distribution to mix with backflow mixed liquor, are provided with the online dissolved oxygen meter in aeration zone; The aeration tube that the install aeration zone bottom machine airduct of giving a dinner for a visitor from afar, aeration tube is selected micro-pore aeration flexible pipe for use, diameter 50～65mm, flexible pipe spacing 110～220mm; The source of the gas of pneumatic lifter is from blower fan.
As preferred version, described pneumatic lifter is selected the air lift water pump for use.
Employing the present invention handles the step of waste water and installs as follows:
(1) waste water rises to hydrolysis acidification pool through equalizing tank, with particulate matter with macromole is hydrolyzed into soluble substance and the COD that degrades;
(2) flow into anaerobic pond, produce methane degraded COD, flow into biological degraded synchronously pond again, COD and N synchronously degrade;
(3) the mixed solution partial reflux of the biological pond end of degrading synchronously is to feed-water end, and part rises to device for separating mud and water, the clear water qualified discharge after the mud-water separation, and mud is back to hydrolysis acidification pool;
(4) excess sludge that produces in the wastewater treatment process enters the sludge disposal system.
The described equalizing tank of step (1), hydraulic detention time 8～12h arranges mechanical grille machine and web plate Microfilter.
The described hydrolysis acidification pool of step (1), the biochemical residence time 8～12h selects compound anaerobic fluidized bed (UBF) for use, and the top arranges waste gas disposal system, and top arranges inclined tube or swash plate, the middle biologic packing material of hanging, the bottom arranges bucket and spoil disposal pipeline.
The described anaerobic pond of step (2), the biochemical residence time 24～36h, feed-water end adds alkali lye, and control water inlet pH6.5～7.5 are selected anaerobic expanded granular sludge bed (EGSB) for use, and the top arranges collecting methane, processing, use device.
The described biology of step (2) pond of degrading synchronously, aeration tube is selected micro-pore aeration flexible pipe for use, aeration tube spacing 110～220mm, dissolved oxygen scope 0.1～1.2mg/L, the biochemical residence time 36～48h.
The described mixed-liquor return of step (3), 20～30 times of reflux ratios, mixed-liquor return is selected pneumatic lifter for use, and preferred is the air lift water pump of power with the air.
The described device for separating mud and water of step (3) is selected ultra-filtration membrane for use.
The described excess sludge of step (4) enters the sludge disposal system, and excess sludge is the biochemical sludge of hydrolysis acidification pool and device for separating mud and water discharging, and the sludge disposal system designs routinely.
The utility model beneficial effect: the one, sludge discharge is little: omnidistance biochemical treatment, make existing materialization settling tank or air flotation pool into hydrolysis acidification pool, adopt biological degradation technique synchronously simultaneously, biochemistry pool control sludge concentration height, every kiloton waste water produces 0.8～1.2 ton in mud (water ratio 80%), reduces more than 50% than traditional technology; The 2nd, COD and N degrade synchronously with the pond, and degradation efficiency promotes: COD
CrClearance is greater than 90%, and ammonia nitrogen removal frank is greater than 90%, and nitrogen removal rate is greater than 80%, and effluent quality reaches " integrated wastewater discharge standard " (GB8978-1996) first discharge standard; The 3rd, cost for wastewater treatment is low: technology does not need to add medicaments such as lime, coagulating agent, PAM, and adopts low dissolved oxygen aeration, and 1.8～2.0 yuan of/ton waste water of cost for wastewater treatment reduce more than 30% than traditional technology.
Description of drawings
Fig. 1 is the schematic flow sheet of soybean wastewater biochemical treatment apparatus embodiment of the present utility model;
Fig. 2 is the floor map of soybean wastewater biochemical treatment apparatus embodiment of the present utility model;
Fig. 3 is the A-A sectional view of Fig. 2.
The explanation of each mark in the accompanying drawing:
The 1-equalizing tank, 2-hydrolysis acidification pool, 3-anaerobic pond, the biological degraded synchronously of 4-pond, 5-mixed-liquor return pneumatic lifter, 6-device for separating mud and water, 7-sludge disposal system, the online dissolved oxygen meter in 8-aeration zone, 9-aeration tube, 10-blower fan, 11-blower fan airduct.
Embodiment
In order better to understand the technical solution of the utility model, set forth below in conjunction with embodiment:
Referring to Fig. 1 figure, 2 and Fig. 3, the soybean wastewater biochemical treatment apparatus, handle the step of waste water and install composed as follows:
(1) waste water rises to hydrolysis acidification pool 2 through equalizing tank 1, with particulate matter with macromole is hydrolyzed into soluble substance and the COD that degrades;
(2) flow into anaerobic pond 3, produce methane degraded COD, enter biological degraded synchronously pond 4 again, COD and N synchronously degrade;
(3) the mixed solution partial reflux of biological pond 4 ends of degrading synchronously is to feed-water end, and part rises to device for separating mud and water 6, the clear water qualified discharge after the mud-water separation, and mud is back to hydrolysis acidification pool 2;
(4) excess sludge that produces in the wastewater treatment process enters sludge disposal system 7.
The described equalizing tank 1 of step (1), hydraulic detention time 8～12 hours, its effect is regulating pondage and even water quality.Mechanical grille machine and web plate Microfilter are set before equalizing tank, by rubbish and the beans shell in the mechanical grille machine removal waste water, remove broken soybean and bean dregs by the web plate Microfilter.
The described hydrolysis acidification pool 2 of step (1) is selected compound anaerobic fluidized bed (UBF) for use, the biochemical residence time 8～12h, and its effect is that the particulate matter in the waste water and macromole are hydrolyzed into soluble substance, degraded COD reduces mud discharging.Substitute traditional materialization settling tank or air flotation pool with hydrolysis acidification pool 2, soybean cellulose in the waste water and polysaccharide hydrolysis are glucose, and vegetable-protein is hydrolyzed to amino acid, and lipid changes into lipid acid, hydrolysate is all water-soluble, and water outlet SS meets the triphase separator requirement of follow-up anaerobic pond 3.Hydrolysis acidification pool 2 is the bottom water inlet, control current upflow velocity 0.8～1.2m/h; COD
CrRemove volumetric loading 3～5KgC OD/m
3.d; High 10～the 12m in the pond of hydrolysis acidification pool 2, the top arranges waste gas disposal system, top arranges inclined tube or swash plate, the middle biologic packing material of hanging, the bottom arranges bucket and spoil disposal pipeline, adopt the intermittent spoil disposal of gravity type boat davit, excess sludge enters sludge disposal system 7, amounts to 0.2～0.4 ton/kiloton of dewatered sludge waste water (water ratio 80%); The water outlet run by gravity enters anaerobic pond 3.
The described anaerobic pond 3 of step (2) is selected anaerobic expanded granular sludge bed (EGSB) for use, the biochemical residence time 24～36h, and its effect is degraded COD when producing methane.Through the water outlet of leading portion acidication, finish the last stage of anaerobic reaction at anaerobic pond 3, methanogen utilizes acetic acid, hydrogen and carbon dioxide generating methane gas, degraded COD.At the top of anaerobic pond 3, gas, solid, liquid three-phase are separated, the methane recovery utilization, and the circulation of a water outlet part, another part enters follow-up biochemical system, and excess sludge stores takes out or enters hydrolysis acidification pool 2.High 13～the 15m in the pond of anaerobic pond 3, Chi Dingyou lid, and supporting collecting methane, processing, use device; Suitably improve the decarburizating that water inlet pH value is conducive to methane-producing bacteria, control pH6.5～7.5, supporting liquid caustic soda adds the robot control system(RCS) with pH; Anaerobic pond 3 is the bottom water inlet, suitably increases waste water internal recycle flow velocity and can improve the muddy water mixing, control current upflow velocity 2～4m/h; COD
CrRemove volumetric loading 5～10KgCOD/m
3.d; The water part promotes circulation with pump, and the water circulating pump lift is greater than 24m; Water outlet gravity flows to biological degraded synchronously pond 4; Excess sludge stores takes out or enters hydrolysis acidification pool 2.
The described biology of step (2) pond 4 of degrading synchronously, the feed-water end of aeration zone adopts the multiple spot water distribution to mix with backflow mixed liquor, by aeration zone online dissolved oxygen meter 8 control dissolved oxygen scopes 0.1～1.2mg/L, the biochemical residence time 36～48h, MLSS7000～8500mg/L, COD
CrRemove volumetric loading 0.8～1.6KgCOD/m
3.d, ammonia nitrogen removal volumetric loading 0.1～0.4Kg ammonia nitrogen/m
3.d.The effect in biological degraded synchronously pond 4 is degrade synchronously COD and N." low dissolved oxygen " narrow (value 0.1～0.5mg/L) of scope that biological simultaneous denitrification technology and low oxygen dissolving control technology are set, when soybean wastewater is handled, because the deficiency of oxygen supply total amount, abundant inadequately to the oxidation of high concentration COD, the COD degradation efficiency is low, need to prolong the biochemical residence time or increase the biochemistry pool capacity, therefore, under low dissolved oxygen level, suitably improve aeration zone dissolved oxygen span of control (0.1～1.2mg/L), when namely guaranteeing simultaneous denitrification, improve the COD degraded again.The low dissolved oxygen control in biological degraded synchronously pond 4 shows that microorganism is in the critical environment of " oxygen of holding concurrently " and " aerobic ", and microbial population is abundant, to the more diversification of organic mechanism of degradation.In " oxygen of holding concurrently " environment: the oxygen heterotrophic bacterium of holding concurrently is hydrolyzed into small molecules, anoxic denitrification bacterium with NO with macromole such as organic carbon and nitrogen heterocyclics
2 -And NO
3 -Be reduced into N
2, anaerobic ammonia oxidizing bacteria becomes N with ammonia oxidation
2In " aerobic " environment: aerobic heterotrophic bacterium is oxidized to CO with organic carbon
2, the aerobic nitrification bacterium becomes NO with ammonia oxidation
2 -With with small amount of N O
3 -, aerobic denitrifying bacteria becomes N with ammonia oxidation
2By above-mentioned serial biochemical reaction, realize that COD and N degrade synchronously with the pond.
Degrade the synchronously aeration zone in pond 4 of the described biology of step (3), the aeration tube 9 machine airduct 11 of giving a dinner for a visitor from afar is installed in the bottom, installing space 80～the 350mm of aeration tube 9, preferred 110～220mm, the high-density of aeration tube 9 is laid and is made that (0.2～0.6m/s), bubble is idle to distribute minimizing to the bubble upflow velocity slowly, can improve dissolved oxygen efficiency, reduce power consumption, can avoid strong aeration to the shearing of microorganism flco simultaneously, sludge coagulating is good, flco is big, degree of compactness is moderate; Aeration tube 9 is selected micro-pore aeration flexible pipe for use, diameter 50～65mm, opening diameter is little on the flexible pipe, the unit length number of aperture is many, the rising bubble diameter is little, and (φ 2～4mm), the small bubbles of in the flco surface adhesion are conducive to the oxidation of aerobic repiration and carbon, nitrogen, and the dissolved oxygen of flco inside abundance not enough and carbon source is conducive to the generation of denitrification, the degradation efficiency of raising COD and N.
The described mixed-liquor return of step (3), 20～30 times of reflux ratios.The mixed-liquor return of biological degraded synchronously pond 4 ends is to feed-water end, and its effect is to improve the water inlet condition, increases sludge concentration.The microorganism characterization is obvious, improves the clearance of COD and N, reduces the mud discharge capacity.Mixed-liquor return pneumatic lifter 5, preferred is the air lift water pump of power with the air.The mixed-liquor return lift height is very little, and (0.1～0.3m), the super liquid level of mixed-liquor return pneumatic lifter 5 more dynamo-electric water pumps promotes, and saves power consumption in theory more than 5 times.In the specific implementation, can control quantity of reflux and reflux ratio by the air intake valve of adjusting mixed-liquor return pneumatic lifter 5, also can adjust quantity of reflux and reflux ratio by degrade the synchronously water quality of pond 4 feed-water ends of detection of biological, the source of the gas of mixed-liquor return pneumatic lifter 5 is from blower fan 10.
The described sludge-water separating system 6 of step (4), select ultra-filtration membrane for use, ultra-filtration membrane clear water qualified discharge, sludge part are back to hydrolysis acidification pool 2 feed-water ends, small part enters the 7 dehydration outward transports of sludge disposal system, amounts to 0.6～0.8 ton/kiloton of dewatered sludge waste water (water ratio 80%).Soybean wastewater COD and N concentration height, wastewater biodegradability is good, and sludge yield is big, the sludge concentration height, MLSS7000～8500mg/L, the method that adopts inclined tube or swash plate to clarify, water outlet band mud phenomenon is more serious, therefore selects for use ultra-filtration membrane to separate, and it is stable that film is handled clear water COD.
Embodiment, certain Bean Products Factory's wastewater treatment
Wastewater treatment is original-pack to be set to " equalizing tank+materialization settling tank+anaerobic pond+Aerobic Pond+materialization air flotation pool ", and water outlet ammonia nitrogen and total nitrogen exceed standard, and sludge yield is big, the processing cost height.Use the utility model device and carry out the wastewater treatment adjustment.
Device after the adjustment: equalizing tank+compound is anaerobic fluidized bed+anaerobic expanded granular sludge bed+biological degraded synchronously pond.
Device parameter after the adjustment: compound anaerobic fluidized bed: biochemical residence time 12h, water outlet COD
Cr8450mg/L, COD
CrClearance 16%, COD
CrRemove volumetric loading 3.1KgCOD/m
3.d; Anaerobic expanded granular sludge bed: biochemical residence time 26h, pH6.8, water outlet COD
Cr1960mg/L, COD
CrClearance 77%, COD
CrRemove volumetric loading 6.0KgCOD/m
3.d; Biological degraded synchronously pond: biochemical residence time 46h, dissolved oxygen scope 0.1～1.2mg/L, MLSS7600～8360mg/L, COD
CrClearance 96%, COD
CrRemove volumetric loading 1.0KgCOD/m
3.d, ammonia nitrogen removal frank 99%, ammonia nitrogen removal volumetric loading 0.2Kg ammonia nitrogen/m
3.d mixed-liquor return equipment is the air lift water pump, 24 times of reflux ratios; Mud-water separation adopts external tubular ultra-filtration membrane.Index was referring to table 1 before and after device was adjusted.
Certain Bean Products Factory's wastewater treatment equipment adjustment of table 1 relatively
Last table shows, the utility model device COD
CrClearance height (99%), ammonia nitrogen removal frank height (99%), nitrogen removal rate height (92%), effluent quality reach " integrated wastewater discharge standard " (GB8978-1996) first discharge standard, and mud (water ratio～80%) quantity discharged reduces 70%, cost for wastewater treatment reduction by 32%.
Claims (1)
1. soybean wastewater biochemical treatment apparatus is characterized in that: waste water flow through equalizing tank, hydrolysis acidification pool, anaerobic pond, biological degraded synchronously pond, sludge-water separating system;
Described equalizing tank is provided with mechanical grille machine and web plate Microfilter,
Described hydrolysis acidification pool is selected for use compound anaerobic fluidized bedly, and the top arranges waste gas disposal system, and top arranges inclined tube or swash plate, the middle biologic packing material of hanging, and the bottom arranges bucket and spoil disposal pipeline; Sludge-water separating system is selected ultra-filtration membrane for use;
Described anaerobic pond, select for use anaerobic expanded granular sludge bed, the high 13～15m in pond, Chi Dingyou lid, the top arranges collecting methane, processing, use device; Supporting liquid caustic soda adds the robot control system(RCS) with pH; Anaerobic pond is the bottom water inlet; The water part promotes circulation with pump, and the water circulating pump lift is greater than 24m;
The described biology pond of degrading synchronously, the feed-water end of aeration zone adopt the multiple spot water distribution to mix with backflow mixed liquor, are provided with the online dissolved oxygen meter in aeration zone; The aeration tube that the install aeration zone bottom machine airduct of giving a dinner for a visitor from afar, aeration tube is selected micro-pore aeration flexible pipe for use, diameter 50～65mm, flexible pipe spacing 110～220mm; The pneumatic lifter that mixed-liquor return uses is selected for use with the air lift water pump of air as power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220706016.0U CN203112653U (en) | 2012-12-13 | 2012-12-13 | Soybean product wastewater biochemical treatment device |
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| CN201220706016.0U CN203112653U (en) | 2012-12-13 | 2012-12-13 | Soybean product wastewater biochemical treatment device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107935314A (en) * | 2017-12-08 | 2018-04-20 | 广西永太和环保科技有限公司 | Soybean wastewater micro-organism treatment process |
| CN108751584A (en) * | 2018-06-04 | 2018-11-06 | 东华大学 | A kind of novel bean product production wastewater treatment and recycling system |
| CN112239311A (en) * | 2020-10-28 | 2021-01-19 | 桂林电子科技大学 | Micro-aeration acidification control wastewater treatment device and method |
-
2012
- 2012-12-13 CN CN201220706016.0U patent/CN203112653U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107935314A (en) * | 2017-12-08 | 2018-04-20 | 广西永太和环保科技有限公司 | Soybean wastewater micro-organism treatment process |
| CN108751584A (en) * | 2018-06-04 | 2018-11-06 | 东华大学 | A kind of novel bean product production wastewater treatment and recycling system |
| CN112239311A (en) * | 2020-10-28 | 2021-01-19 | 桂林电子科技大学 | Micro-aeration acidification control wastewater treatment device and method |
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