CN1915863A - Method of immobilized sludge to remove nitrogen, phosphor in eutrophication water body - Google Patents
Method of immobilized sludge to remove nitrogen, phosphor in eutrophication water body Download PDFInfo
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- CN1915863A CN1915863A CNA2006100861025A CN200610086102A CN1915863A CN 1915863 A CN1915863 A CN 1915863A CN A2006100861025 A CNA2006100861025 A CN A2006100861025A CN 200610086102 A CN200610086102 A CN 200610086102A CN 1915863 A CN1915863 A CN 1915863A
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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
- 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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Abstract
This invention discloses a method for removing N and P from nutrition-rich water body by fixed sludge. The method comprises: embedding and fixing acclimated sludge on a carrier by fixation technique to obtain spheres of acclimated sludge, performing pre-anaerobic treatment on the spheres, and removing N and P from nutrition-rich water body by the fixed sludge. The carrier is sodium alginate, and the embedded sludge is self- acclimated sludge with high N and P removing efficiency. The method has good N and P removing effects when treating nutrition-rich water body, and the solid-liquid separation is easy. Besides, P in the water can be recovered.
Description
One, technical field
The invention belongs to field of environment protection, particularly a kind of immobilized sludge is handled the method for nitrogen, phosphorus in the eutrophication water.
Two, background technology
Nutritive substance such as nitrogen, phosphorus is the principal pollutant that cause body eutrophications such as lake, reservoir, and the main control measures of body eutrophication can be divided into engineering measure (bed mud dredging, carry out water body deep aerating, water filling towards rare and lay plastics etc. on the bed mud surface), chemical method (add chemical agent flocking settling phosphoric acid salt and kill algae with chemical agent), biological measure (utilize hydrobiont to absorb nitrogen, phosphoric carries out Metabolic activity to remove the method for nitrogen, phosphorus nutrition material in the water body) etc.But bed mud dredging cost height and can not effectively administer body eutrophication (Pu train the people, and kingdom is auspicious, Hu Chunhua, etc. bed mud is dredged can control lake eutrophication. lake science, 2000,12 (3): 269 ~ 279); Add the weak point of holding time of chemical flocculation medicament, and need regular replenishment, though and use algicide can kill algae, but the plant materials of dying can discharge a large amount of nutritive substances in water, can stimulate a large amount of algae grows to break out conversely again; Planting aquatic plants spended time long (some months) needs in time to salvage, and when introducing waterplant, the danger that also can produce biotic intrusion.Activated sludge process is a kind of effective denitrification and dephosphorization method, and it can be removed nitrogen and anaerobic phosphorus release, aerobic excess at absorbed nitrogen, phosphorus nutrition material as aerobic nitrification, anaerobic denitrifying effect outside the composition of self growth needs by microorganism and inhale phosphorus, in time removes excess and inhale the microorganism (mud) of phosphorus and remove phosphorus.A prerequisite of the denitrogenation dephosphorizing of microorganism is exactly the anaerobism of microorganism, aerobic circulation, simultaneously provides effective carbon source at anaerobic stages, with the denitrification denitrogenation that satisfies microorganism with effectively release phosphorus; And need in time from system, remove the microorganism (mud) that excess is inhaled phosphorus.Therefore, common active sludge is administered as being applied to body eutrophication, then can keep suspended state owing to difficulty makes active sludge, solid-liquid separation and recovery active sludge difficulty, can't in time remove active sludge from system, the difficult many former thereby restricted activity mud methods such as anaerobism, aerobic alternate cycles that realize are applied to the improvement of body eutrophication.
Bio-immobilized technology is the technological method that of modern biological project field is emerging, be mainly used in the synthetic and chemicals production of medicine, also is widely used in the environmental improvement field in recent years.It is fixed on microorganism and makes its highly dense on the carrier and keep its bioactive functions, this technology is applied to environmental improvement, help to improve the biomass in the bio-reactor, be beneficial to reacted solid-liquid separation, shorten and handle required getting the time, can effectively remove pollutent, but have not yet to see the report that this technology is applied to remove in the eutrophication water nitrogen, two kinds of elements of phosphorus.
Three, summary of the invention
The method that a kind of treatment effect is good in order providing, solid-liquid separation is easy to nitrogen, phosphorus in the immobilized sludge removal eutrophication water to be provided, to be used for the additional and perfect of existing environmental improvement technology.
The technical scheme that realizes the object of the invention is:
(1) domestication of mud is cultivated: the active sludge that will take from the municipal sewage plant carries out anaerobic-aerobic with simulated wastewater and alternately cultivates, tames in SBR (sequence bioreactor) reactor.When domestication finished, the acclimated activated sludge form was for large stretch of cotton-shaped and accompany a small amount of tawny granule sludge, and MLSS (mixed liquor suspended solid, MLSS concentration) is 3.0 ~ 5.0g/L, and SVI (sludge volume index) is 50 ~ 100.Simulated wastewater main component: COD (chemical aerobic amount) is 100 ~ 1000mg/L, and TN (total nitrogen) is 5 ~ 50mg/L, and TP (total phosphorus) is 1 ~ 20mg/L, and other contains trace elements such as K, Na, Ca, Mg, Fe, S, Cl.
(2) immobilization of mud: the active sludge that domestication is finished concentrates the back embedding and is fixed in the sodium alginate carrier, forms calcium-alginate-immobilized mud bead; It comprises following step:
D, produce thickened sludge: the acclimation sludge precipitation is concentrated, active sludge is dewatered as much as possible;
E, produce the immobilized sludge bead: thickened sludge is mixed with sodium alginate soln to form sodium alginate concentration be the mixed solution of 1.0 ~ 3.0% (weight percents), mixed solution is evenly splashed into solidifying agent CaCl by peristaltic pump
2In the solution, solidifying agent CaCl
2Concentration be 3.0 ~ 10.0% (weight percents), the immobilization time is 8 ~ 48h, obtains calcium-alginate-immobilized mud bead after the calcification;
F, with calcium-alginate-immobilized mud bead take out, flushing, refrigerate stand-by.
(3) pre-treatment of immobilized sludge bead:, make the active sludge denitrification denitrogenation of embedding in the bead and discharge phosphoric acid salt with calcium-alginate-immobilized mud bead pre-treatment 2 ~ 8h in anaerobic reactor that above-mentioned steps (2) is made;
(4) use the immobilized sludge bead to dispose of sewage: pretreated calcium-alginate-immobilized mud bead is transferred in the pending polluted-water, make the good oxygen condition of maintenance of immobilized sludge bead, stop 4 ~ 24h, carry out aerobic suction phosphorus and nitration reaction, remove organism, ammonia nitrogen and TP in the sewage;
(5) denitrification and release phosphorus: the calcium-alginate-immobilized mud bead that reaction in the step (4) is finished takes out and is transferred in the anaerobic reactor, stops 2 ~ 8h, carries out anti-nitration reaction and anaerobic phosphorus release;
(6) recovery of phosphorus: add alkali lye in anaerobic reactor, adjusting reactor pH value is about 9.0 ~ 9.6, makes the calcium phosphate precipitation of generation, reclaims phosphorus.
In the reaction process of above-mentioned steps (3) and (5), can in anaerobic reactor, add sodium acetate, making anaerobic reactor water inlet COD is 300 ~ 1000mg/L, and stirs in anaerobic process, makes that the release of the anti-nitration reaction of immobilized sludge and phosphorus all can be fast, carries out smoothly.
In the removal process of above-mentioned steps (6) phosphorus, after removing calcium phosphate precipitation,, reactor solution pH value is adjusted between 6.5 ~ 7.5 for the continuation that guarantees anaerobic reactor normally moves.
The present invention compares with existing sewage disposal technology, and its advantage is:
1. the denitrogenation dephosphorizing that is fit to eutrophication water
The technological line that the present invention adopts is different from general active sludge denitrification and dephosphorization method, it is the combination of active sludge denitrogenation dephosphorizing method and immobilized microorganism technique, solid-liquid separation is easy, simple to operate, the anaerobism that can realize immobilized sludge smoothly, good oxygen cycle, can remove nitrogen, phosphorus in the eutrophication water (lake, reservoir).Compare with traditional bed mud dredging, the eutrophication water improvement methods such as chemical agent, planting aquatic plants that add, can not only effectively remove nutritive substances such as nitrogen in the water body, phosphorus, and the destruction that can not produce the ecosystem, do not have the danger of biotic intrusion, can not cause detrimentally affects such as secondary pollution, so have tangible advantage yet.
2. treatment effect is good
The present invention adopts microbial immobilized technology, and acclimated activated sludge is fixed on the sodium alginate carrier, has obviously improved the unit volume biomass, make that biomass can reach 24 ~ 46g/L in the reactor, biochemical reaction rate is fast, and treatment effect is good, and effluent quality is excellent.Use this technical finesse and handle river (lake, the reservoir) water that is subjected to pollution of area source, treat effluent can reach the above water quality standard (lake, library standard) of three classes of surface water quality standard.
3. solid-liquid separation is easy
Because adopt immobilized sludge technical finesse sewage, with respect to the ordinary activated sludge method, solid-liquid separation is easy, going out water suspension does not almost have, the effluent characteristics height, and effluent quality is guaranteed.
4. effectively remove nitrogen, phosphor contaminant in the water
Adopt immobilized sludge treatment technology of the present invention,, therefore, during pollutents such as the ammonia nitrogen in removing simulated sewage, TP, make things convenient for because embedding is the acclimation sludge with high-efficient denitrification and dephosphorization ability, efficient.When influent ammonium concentration reached 25mg/L, 24h water outlet ammonia nitrogen concentration can be lower than 1.0mg/L, and when water inlet TP concentration reached 10mg/L, 24h water outlet TP concentration can be lower than 0.2mg/L.
5. but efficient recovery phosphorus
Adopt immobilized sludge treatment technology of the present invention, can be after anaerobism finish, the phosphorus that utilizes the chemical precipitation method efficient recovery to discharge produces certain economic benefits.When handling the phosphorus-containing wastewater of 10mg/L, the phosphorus that anaerobism discharges accounts for more than 51.6% of total absorption phosphorus.
Four, embodiment
Below in conjunction with embodiment the present invention is further described in detail: (following concentration all is weight percentage)
Embodiment 1:
(1) active sludge being used anaerobic-aerobic replace technology in the sbr reactor device cultivates, tames;
(2) active sludge that domestication is finished concentrates, and active sludge is dewatered as much as possible; Again thickened sludge is mixed with sodium alginate soln that to form sodium alginate concentration be 3.0% mixed solution, mixed solution is evenly splashed into the CaCl of 10.0% concentration by peristaltic pump
2In the solution, the immobilization time is 48h, obtains calcium-alginate-immobilized mud bead after the calcification; Calcium-alginate-immobilized mud bead is taken out, washes, refrigerate stand-by;
Calcium-alginate-immobilized mud bead pre-treatment 8h in anaerobic reactor that (3) will make makes the active sludge denitrification denitrogenation of embedding in the bead and discharges phosphoric acid salt;
(4) pretreated calcium-alginate-immobilized mud bead is transferred in the pending simulated wastewater 1, the immobilized sludge bead is 1: 3 with the volume ratio of disposing of sewage, and has kept oxygen condition, stops 24h, carry out aerobic suction phosphorus and nitration reaction, remove organism, ammonia nitrogen and TP in the sewage;
(5) will react the calcium-alginate-immobilized mud bead that finishes and take out and be transferred in the anaerobic reactor, stop 8h, carry out anti-nitration reaction and anaerobic phosphorus release;
(6) add alkali lye in anaerobic reactor, adjusting reactor pH value is about 9.0 ~ 9.6, makes the calcium phosphate precipitation of generation, reclaims phosphorus.
The present embodiment testing data is as follows: aerobic water inlet COD mean value 152mg/L, outputted aerobic water COD mean value 16mg/L, clearance 89.5%; Aerobic influent ammonia nitrogen mean value 25.6mg/L, outputted aerobic water ammonia nitrogen mean value 0.89mg/L, clearance 96.5%; Aerobic water inlet TP mean value 9.86mg/L, outputted aerobic water TP mean value 0.20mg/L, clearance 98.0%; Back anaerobism water outlet TP mean value 4.98mg/L, the phosphorus burst size is 51.6% of an absorbed dose.
Embodiment 2:
(1) active sludge being used anaerobic-aerobic replace technology in the sbr reactor device cultivates, tames;
(2) active sludge that domestication is finished concentrates, and active sludge is dewatered as much as possible; Again thickened sludge is mixed with sodium alginate soln that to form sodium alginate concentration be 2.0% mixed solution, mixed solution is evenly splashed into the CaCl of 5.0% concentration by peristaltic pump
2In the solution, the immobilization time is 24h, obtains calcium-alginate-immobilized mud bead after the calcification; Calcium-alginate-immobilized mud bead is taken out, washes, refrigerate stand-by;
Calcium-alginate-immobilized mud bead pre-treatment 4h in anaerobic reactor that (3) will make makes the active sludge denitrification denitrogenation of embedding in the bead and discharges phosphoric acid salt;
(4) pretreated calcium-alginate-immobilized mud bead is transferred in the pending simulated wastewater 2, the immobilized sludge bead is 1: 3 with the volume ratio of disposing of sewage, and has kept oxygen condition, stops 12h, carry out aerobic suction phosphorus and nitration reaction, remove organism, ammonia nitrogen and TP in the sewage;
(5) will react the calcium-alginate-immobilized mud bead that finishes and take out and be transferred in the anaerobic reactor, stop 4h, carry out anti-nitration reaction and anaerobic phosphorus release;
(6) add alkali lye in anaerobic reactor, adjusting reactor pH value is about 9.0 ~ 9.6, makes the calcium phosphate precipitation of generation, reclaims phosphorus.
The present embodiment testing data is as follows: aerobic water inlet COD is 100mg/L, outputted aerobic water COD mean value 12mg/L, clearance 88%; Aerobic influent ammonia nitrogen mean value 15.4mg/L, outputted aerobic water ammonia nitrogen mean value 0.72mg/L, clearance 95.3%; Aerobic water inlet TP mean value 5.18mg/L, outputted aerobic water TP mean value 0.20mg/l, clearance 96.1%; Back anaerobism water outlet TP mean value 1.78mg/L, the phosphorus burst size is 35.7% of an absorbed dose.
Embodiment 3:
(1) active sludge being used anaerobic-aerobic replace technology in the sbr reactor device cultivates, tames;
(2) active sludge that domestication is finished concentrates, and active sludge is dewatered as much as possible; Again thickened sludge is mixed with sodium alginate soln that to form sodium alginate concentration be 1.0% mixed solution, mixed solution is evenly splashed into the CaCl of 3.0% concentration by peristaltic pump
2In the solution, the immobilization time is 8h, obtains calcium-alginate-immobilized mud bead after the calcification; Calcium-alginate-immobilized mud bead is taken out, washes, refrigerate stand-by;
Calcium-alginate-immobilized mud bead pre-treatment 2h in anaerobic reactor that (3) will make makes the active sludge denitrification denitrogenation of embedding in the bead and discharges phosphoric acid salt;
(4) pretreated calcium-alginate-immobilized mud bead is transferred in the pending simulated wastewater 3, the immobilized sludge bead is 1: 3 with the volume ratio of disposing of sewage, and has kept oxygen condition, stops 4h, carry out aerobic suction phosphorus and nitration reaction, remove organism, ammonia nitrogen and TP in the sewage;
(5) will react the calcium-alginate-immobilized mud bead that finishes and take out and be transferred in the anaerobic reactor, stop 2h, carry out anti-nitration reaction and anaerobic phosphorus release;
(6) add alkali lye in anaerobic reactor, adjusting reactor pH value is about 9.0 ~ 9.6, makes the calcium phosphate precipitation of generation, reclaims phosphorus.
The present embodiment testing data is as follows: aerobic water inlet COD is 50mg/l, outputted aerobic water COD mean value 8mg/l, clearance 84%; Aerobic influent ammonia nitrogen mean value 4.92mg/l, outputted aerobic water ammonia nitrogen mean value 0.49mg/l, clearance 90%; Aerobic water inlet TP mean value 1.18mg/l, outputted aerobic water TP mean value 0.02mg/l, clearance 98.3%; Back anaerobism water outlet TP mean value 0.20mg/L, the phosphorus burst size is 17.2% of an absorbed dose.
Embodiment 4:
(1) active sludge being used anaerobic-aerobic replace technology in the sbr reactor device cultivates, tames;
(2) active sludge that domestication is finished concentrates, and active sludge is dewatered as much as possible; Again thickened sludge is mixed with sodium alginate soln that to form sodium alginate concentration be 2.0% mixed solution, mixed solution is evenly splashed into the CaCl of 5.0% concentration by peristaltic pump
2In the solution, the immobilization time is 24h, obtains calcium-alginate-immobilized mud bead after the calcification; Calcium-alginate-immobilized mud bead is taken out, washes, refrigerate stand-by;
Calcium-alginate-immobilized mud bead pre-treatment 4h in anaerobic reactor that (3) will make makes the active sludge denitrification denitrogenation of embedding in the bead and discharges phosphoric acid salt;
(4) pretreated calcium-alginate-immobilized mud bead is transferred in the pending eutrophic lake water, the volume ratio of immobilized sludge bead and eutrophic lake water is 1: 3, kept oxygen condition, stop 8h, carry out aerobic suction phosphorus and nitration reaction, remove organism, ammonia nitrogen and TP in the sewage;
(5) will react the calcium-alginate-immobilized mud bead that finishes and take out and be transferred in the anaerobic reactor, stop 5h, carry out anti-nitration reaction and anaerobic phosphorus release;
(6) add alkali lye in anaerobic reactor, adjusting reactor pH value is about 9.0 ~ 9.6, makes the calcium phosphate precipitation of generation, reclaims phosphorus.
The present embodiment testing data is as follows: aerobic influent ammonia nitrogen mean value 4.56mg/l, outputted aerobic water ammonia nitrogen mean value 0.35mg/l, clearance 92.3%; Aerobic water inlet TP mean value 0.62mg/l, outputted aerobic water TP mean value 0.02mg/l, clearance 96.8%; Back anaerobism water outlet TP mean value 0.11mg/L, the phosphorus burst size is 18.3% of an absorbed dose.
Claims (5)
1, a kind of immobilized sludge is removed the method for nitrogen, phosphorus in the eutrophication water, and this method may further comprise the steps:
(1) active sludge being used anaerobic-aerobic replace technology in the sbr reactor device cultivates, tames;
(2) active sludge that domestication is finished concentrates the back embedding and is fixed in the sodium alginate carrier, forms calcium-alginate-immobilized mud bead;
(3), make the active sludge denitrification denitrogenation of embedding in the bead and discharge phosphoric acid salt with calcium-alginate-immobilized mud bead pre-treatment 2 ~ 8h in anaerobic reactor;
(4) pretreated calcium-alginate-immobilized mud bead is transferred in the pending polluted-water, has kept oxygen condition, stop 4 ~ 24h, carry out aerobic suction phosphorus and nitration reaction, remove organism, ammonia nitrogen and TP in the sewage;
(5) the calcium-alginate-immobilized mud bead that reaction in the step (4) is finished takes out and is transferred in the anaerobic reactor, stops 2 ~ 8h, carries out anti-nitration reaction and anaerobic phosphorus release;
(6) add alkali lye in anaerobic reactor, adjusting reactor pH value is about 9.0 ~ 9.6, makes the calcium phosphate precipitation of generation, reclaims phosphorus.
2, immobilized sludge according to claim 1 is removed the method for nitrogen, phosphorus in the eutrophication water, it is characterized in that: form calcium-alginate-immobilized mud bead and may further comprise the steps in above-mentioned steps (2):
A, produce thickened sludge: the sludge settling after will taming concentrates, and active sludge is dewatered as much as possible;
B, produce the immobilized sludge bead: thickened sludge is mixed with sodium alginate soln to form sodium alginate concentration be the mixed solution of 1.0 ~ 3.0% (weight percents), mixed solution is evenly splashed into solidifying agent CaCl by peristaltic pump
2In the solution, calcification obtains calcium-alginate-immobilized mud bead;
C, with calcium-alginate-immobilized mud bead take out, flushing, refrigerate stand-by.
3, immobilized sludge according to claim 2 is removed the method for nitrogen, phosphorus in the eutrophication water, it is characterized in that: in the immobilization process of above-mentioned steps (b), and solidifying agent CaCl
2Concentration be 3.0 ~ 10.0% (weight percents), the immobilization time is 8 ~ 48h.
4, immobilized sludge according to claim 1 and 2 is removed the method for nitrogen, phosphorus in the eutrophication water, it is characterized in that: in the anaerobic reactor of above-mentioned steps (3) and (5), add sodium acetate, making anaerobic reactor water inlet COD is 300 ~ 1000mg/L, and stir in anaerobic process, make that the release of the anti-nitration reaction of immobilized sludge and phosphorus all can be fast, carry out smoothly.
5, immobilized sludge according to claim 1 and 2 is removed the method for nitrogen, phosphorus in the eutrophication water, it is characterized in that: in the removal process of above-mentioned steps (6) phosphorus, after removing calcium phosphate precipitation, for the continuation that guarantees anaerobic reactor normally moves, reactor solution pH value is adjusted between 6.5 ~ 7.5.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186386B (en) * | 2007-12-06 | 2013-03-27 | 诸暨菲达宏宇环保设备有限公司 | Integrate highly effective low-consume town integrated sewage treatment technique |
| CN107904225A (en) * | 2017-11-29 | 2018-04-13 | 沈阳建筑大学 | A kind of microorganism gel ball for embedding thermophilic cold denitrifying bacterium and preparation method thereof |
| CN113684200A (en) * | 2021-07-29 | 2021-11-23 | 清华大学深圳国际研究生院 | Immobilized particles of microalgae and granular sludge and preparation method thereof |
| CN117534204A (en) * | 2023-12-20 | 2024-02-09 | 武汉市仪泰环境科技有限公司 | SBR sewage treatment system and process based on hydrogel balls |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61219385A (en) * | 1985-03-25 | 1986-09-29 | Ebara Sogo Kenkyusho:Kk | Immobilization of nitrobacter |
| US6153416A (en) * | 1999-01-20 | 2000-11-28 | Yuan; Yu-Kang | Immobilization of microbial cells and enzymes in calcium alginate-polyethylene glycol-polyethylene imide beads |
| JP2001246397A (en) * | 2000-03-03 | 2001-09-11 | Kansai Paint Co Ltd | Method for removing nitrogen in waste water |
| CN1179893C (en) * | 2002-11-15 | 2004-12-15 | 北京三泰正方生物环境科技发展有限公司 | Fixed-microbe seawage-treatment technology |
| CN1702044A (en) * | 2005-03-28 | 2005-11-30 | 江苏省环境科学研究院 | Method for removing low-concentration heavy metal by embedding heat-inactivation activated sludge with sodium acetylide |
| CN100417459C (en) * | 2005-12-21 | 2008-09-10 | 中国石油化工股份有限公司 | A kind of solid composite microbial microsphere for soil remediation and preparation method thereof |
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2006
- 2006-08-29 CN CNB2006100861025A patent/CN100384994C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186386B (en) * | 2007-12-06 | 2013-03-27 | 诸暨菲达宏宇环保设备有限公司 | Integrate highly effective low-consume town integrated sewage treatment technique |
| CN107904225A (en) * | 2017-11-29 | 2018-04-13 | 沈阳建筑大学 | A kind of microorganism gel ball for embedding thermophilic cold denitrifying bacterium and preparation method thereof |
| CN107904225B (en) * | 2017-11-29 | 2021-12-07 | 沈阳建筑大学 | Microorganism gel ball embedded with psychrophilic denitrifying bacteria and preparation method thereof |
| CN113684200A (en) * | 2021-07-29 | 2021-11-23 | 清华大学深圳国际研究生院 | Immobilized particles of microalgae and granular sludge and preparation method thereof |
| CN117534204A (en) * | 2023-12-20 | 2024-02-09 | 武汉市仪泰环境科技有限公司 | SBR sewage treatment system and process based on hydrogel balls |
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