CN103193370A - Phosphorus recovery device for excess sludge - Google Patents

Phosphorus recovery device for excess sludge Download PDF

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Publication number
CN103193370A
CN103193370A CN2013101074991A CN201310107499A CN103193370A CN 103193370 A CN103193370 A CN 103193370A CN 2013101074991 A CN2013101074991 A CN 2013101074991A CN 201310107499 A CN201310107499 A CN 201310107499A CN 103193370 A CN103193370 A CN 103193370A
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China
Prior art keywords
sludge
mud
recovery device
phosphorus recovery
phosphorus
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CN2013101074991A
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Inventor
孙连鹏
欧伟松
谭锦欣
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Sun Yat Sen University
National Sun Yat Sen University
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National Sun Yat Sen University
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Priority to CN2013101074991A priority Critical patent/CN103193370A/en
Publication of CN103193370A publication Critical patent/CN103193370A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to the field of sludge and sewage treatment in environmental engineering, and particularly relates to a phosphorus recovery device for excess sludge. The device comprises a nitrogen-phosphorus recovering device and a sludge anaerobic reactor which is connected with the nitrogen-phosphorus recovering device, wherein the sludge anaerobic reactor is provided with a sludge standing reactor which is used for releasing phosphorus in the excess sludge by adopting the anaerobic reaction method; and a struvite nitrogen-phosphorus recovering device is used for receiving phosphorus elements in the excess sludge through a magnesium ammonium phosphate crystal (struvite). The recovery device is simple to operate, remarkable in phosphorus releasing effect, stable to run, and relatively low in cost.

Description

A kind of phosphorus recovery device of excess sludge
Technical field
The invention belongs to environmental engineering mud, sewage treatment area, be specifically related to a kind of phosphorus recovery device of excess sludge.
Background technology
Phosphorus is the important non-metallic mineral resource that is difficult to regenerate, and has important economic value in the middle of the growing industry of China.At present, surpass 90% phosphate fertilizer in the world from phosphate ore.The authoritative institution measuring and calculating different according to the whole world, global phosphor resource can only use 60 ~ 130 a.International Rock Phosphate (72Min BPL) price soars all the way especially in recent years, than having turned over 6 times before 10 a.According to statistics, China has 2,700,000,000 t signature phosphorus ore reserves now, only enough keeps China and re-uses about 70 years, wherein also comprises the non-rich phosphorus ore more than 90%.If only with rich phosphorus ore phosphorus calculation of reserves, then only can keep China and use 10 ~ 15 years, phosphorus ore has been listed in China can not satisfy one of 20 kinds of mineral products of national economic development needs after 2010.
On the other hand, nutritive elements such as current nitrogen, phosphorus increase the weight of day by day with the caused body eutrophication phenomenon of sewage discharge.And in the process of sewage disposal, because phosphoric has the characteristics of uniflux, consumption can not directly be decomposed, most phosphorus can only be stored in the form of bioelement in the organism, finally discharge with the form of excess sludge, a large portion phosphor resource can't carry out reuse in the feasible life.
Find that after deliberation the mud phosphorus content of supernatant liquor after treatment can reach more than the 100mg/L.Therefore, pass through effective means, phosphorus is discharged from municipal sludge and reclaimed with a definite form, this not only handles disposal for sludge from wastewater treatment plant and resource utilization has been opened up a new direction, and to guaranteeing the normal operation of Sewage Plant, alleviate water body eutrophication degree, improve the Urban Water Environment quality, alleviate the secondary pollution of sludge disposal, promote that the sustainable use of phosphor resource is significant.
Adopt the struvite precipitator method to be considered to the business-like phosphorus in waste water recovery technology of a kind of most possible realization.The struvite denitrogenation dephosphorizing can reclaim nitrogen, phosphoric in the mud supernatant liquor, Mg in the mud supernatant liquor simultaneously 2+, NH 4 +And PO 4 3-When reaching finite concentration, and its ionic concn is long-pending during greater than solubility product constant Ksp, can generate a large amount of struvite precipitations by regulating pH, and then realize the recovery of nitrogen, phosphoric.Reaction formula is: Mg 2++ NH 4 ++ PO 4 3-+ 6H 2O → MgNH 4PO 46H 2O ↓.At present existing patent is absorbed in mostly to rich phosphorus Wastewater Recovery processing, lacks the research that phosphoric in the mud is recycled.
But, to phosphoric in the excess sludge recycle the problem at first run into be allow phosphoric discharge earlier, ultrasonic wave, the ozone oxidation methods of adopting discharge the phosphoric in the excess sludge more in the prior art, though ultrasonic wave, that the ozone oxidation method is released phosphorus is effective, power consumption becomes the big shortcoming of one greatly.So, study a kind of simple to operate, stable, phosphorus recovery device of excess sludge that expense is extremely cheap and the demand that method is a kind of urgent need.
Summary of the invention
The objective of the invention is the deficiency at the recovery of prior art excess sludge phosphorus, a kind of phosphorus recovery device of excess sludge is provided.Described device adopts the method for anaerobic reaction that phosphorus in the excess sludge is discharged earlier, and then with the phosphoric in ammoniomagnesium phosphate crystal (struvite) the recovery excess sludge.Described device is simple to operate, and it is obvious to release the phosphorus effect, and is stable, expense is extremely cheap.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of phosphorus recovery device of excess sludge comprises nitrogen and phosphorus recovery device, also comprises the anaerobic reaction device that links to each other with nitrogen and phosphorus recovery device by mud supernatant liquor dispatch tube; Described anaerobic reaction device comprises the sludge anaerobic reactor, and the sludge anaerobic reactor is provided with mud standing and reacting device.Existing nitrogen and phosphorus recovery device, just at phosphorus in the waste water, and the present invention makes the phosphoric in the mud discharge earlier by increasing the sludge anaerobic reactor, and then utilizes nitrogen phosphorus device to reclaim the phosphorus that discharges.
Preferably, described mud standing and reacting device is provided with coagulant dosage pipe, sludge discharging pipe and whipping appts, sludge discharging pipe be provided with second under meter and be located at second under meter and mud standing and reacting device between second sludge pump.
Preferably, in order to monitor the process of sludge reaction in the sludge anaerobic reactor, described sludge anaerobic reactor also is provided with mud inlet pipe, mud evacuated tube, pH meter, ORP meter and advances the mud Controlling System; The mud inlet pipe is provided with the first sludge pump box and is located at first flow meter between first sludge pump and the sludge anaerobic reactor.
Preferably, in order to realize the near real-time quantitative monitoring of whole device, describedly advance the mud Controlling System according to the time of the monitoring Numerical Control sludge anaerobic reaction of the pH meter of establishing in the sludge anaerobic reactor, ORP meter, advance the mud Controlling System also according to the switch of the Data Control of advancing the mud amount first sludge pump of first flow meter record.
Preferably, described nitrogen and phosphorus recovery device is the struvite nitrogen and phosphorus recovery device.
Further, described struvite nitrogen and phosphorus recovery device comprises interconnective double tube reactor and effluent trough, and double tube reactor comprises interior pipe and the outer tube of mutual socket.Particularly, the top of described interior pipe is provided with mud supernatant dispatch tube and waste gas goes out to manage, the top of interior pipe is provided with magnesium salt solution inlet pipe, alkali lye inlet pipe, and the middle part of interior pipe is provided with and the air inlet pipe;
Described outer tube comprises top, reducing pipe connecting, bottom and bottom, and top is thick, the bottom is thin, connects by the reducing pipe connecting between the upper and lower, and the bottom is the struvite deposition region; The bottom of outer tube is provided with and replenishes the alkali lye inlet pipe, and the bottom of outer tube is provided with the throw out vent pipe, and the top of outer tube is provided with effluent weir, the mud supernatant liquor through the effluent weir overflow to effluent trough.
Preferably, in order to remove most of suspended particle, guarantee the purity that struvite generates, described in pipe be provided with the magnesium salt solution inlet pipe, between the magnesium salt solution inlet pipe of interior pipe and mud supernatant liquor dispatch tube, also be provided with filter screen, described filter screen is circular filter screen.
Preferably, the top of the outer tube of described outer tube is provided with effluent weir, the mud supernatant liquor after the processing through the effluent weir overflow to effluent trough.
Preferably, can carry out good anaerobic reaction in order to make mud, fully phosphorus be discharged, described sludge anaerobic reactor is the pot type anaerobic reactor.
A kind of phosphorus of excess sludge reclaims technology, comprises the steps:
S1. excess sludge rises to by first sludge pump and carries out anaerobic reaction in the sludge anaerobic reactor, the first flow meter records into mud amount, control the switching time of first sludge pump by advancing the mud Controlling System, the measurement feedback of the pH meter in the sludge anaerobic reactor and ORP meter is to advancing the mud Controlling System, the time of Controlling System control sludge anaerobic reaction;
S2. excess sludge is through behind the anaerobic reaction, enter into mud standing and reacting device from the sludge anaerobic reactor in the mode of overflow, add an amount of coagulating agent through the coagulant dosage pipe simultaneously, agitator with coagulating agent and anaerobism after mud stir, make mud produce flocculation sediment, improve the effect of mud solid-liquid separation; After the stirring, close agitator, mud leaves standstill, and solid-liquid separation obtains the mud supernatant liquor; The mud supernatant liquor enters the struvite nitrogen and phosphorus recovery device by mud supernatant liquor dispatch tube, and precipitating sludge is discharged into Sewage treatment systems by second sludge pump through sludge discharging pipe, second under meter monitoring sludge discharge on the sludge discharging pipe;
S3. after the mud supernatant liquor enters into the struvite nitrogen and phosphorus recovery device, by blast main bubbling air in the middle part of interior pipe, waste gas goes out pipe by waste gas and discharges, after the mud supernatant liquor filters through circular filter screen, overwhelming majority suspended particle is removed, pipe middle part in clarification mud supernatant liquor enters into, add an amount of magnesium chloride solution by the magnesium salt solution inlet pipe simultaneously, add sodium hydroxide solution by the alkali lye inlet pipe, the pH of pipe middle part solution in regulating, the mud supernatant liquor, magnesium chloride solution and sodium hydroxide solution be fully reaction under the stirring action of air, enter sectional area in the further reaction back transition in interior pipe bottom and become big outer tube gradually, carry out the precipitation of struvite crystals, bottom at outer tube replenishes proper quantity of lye by replenishing the alkali lye inlet pipe again, regulate the pH value of mud supernatant liquor, reacted mud supernatant liquor is discharged through effluent weir overflow to effluent trough, the struvite throw out is regularly discharged from outer tube bottom settlings thing vent pipe, and it filters the back supernatant liquor and flows into Sewage treatment systems with the mud supernatant liquor of handling.
Compared with prior art, the present invention has following beneficial effect:
(1) pot type anaerobic reactor of the present invention arranges into mud Controlling System, can increase pH and ORP warning simultaneously by controlling different advancing the mud amount and then control sludge retention time, can effectively guarantee the anaerobism effect of excess sludge.
(2) excess sludge behind the anaerobic reaction enters mud standing and reacting device in the overflow mode of liquid level control, guarantees the accuracy of sludge retention time in the simplest mode.In addition, increased the coagulant dosage pipe in the mud standing and reacting device, can avoid the halfway situation of solid-liquid separation, effectively from mud, extracted high concentration N, phosphorus supernatant liquor and carry out struvite and reclaim reaction.
(3) circular filter screen being set can filter the mud supernatant liquor, removes most of suspended particle, guarantees the purity that struvite generates.
(4) the pipe hypomere arranges the air inlet pipe in the shell type reactor, and carbonic acid gas improves pH value of solution, reduces the alkali lye dosage in the solution thereby can remove, and provides mixing energy for the struvite formation reaction simultaneously.
(5) increased suddenly by interior pipe to outer tube cross-sectional area in the shell type reactor, to the growth formation promoter action of struvite.
(6) two cover pH Controlling System have one in front and one in back effectively guaranteed the alkaline environment of struvite formation reaction.
(7) the present invention can realize extracting from sewage treatment plant residual mud and reclaim most of the nitrogen, phosphoric.The present invention reclaims reactor with sludge anaerobic reactor and phosphorus and combines, and forms an integrated phosphorus recovery device, has characteristics such as simple and compact for structure, reduced investment, simple to operate, phosphorous recovery height.
Description of drawings
Fig. 1. the structural representation of apparatus of the present invention sludge anaerobic reactive moieties.
Fig. 2. the structural representation of apparatus of the present invention phosphoric recovery part.
Fig. 3. apparatus of the present invention structural representation.
Fig. 4. the schematic flow sheet of technology of the present invention.
Reference numeral table: 1 mud inlet pipe, 2 first sludge pumps, 3 first flow meters, 4 sludge anaerobic reactors, the 5pH meter, the 6ORP meter, 7 advance the mud Controlling System, 8 mud standing and reacting devices, 9 coagulant dosage pipes, 10 mud supernatant liquor dispatch tubes, 11 second sludge pumps, 12 second under meters, 13 sludge discharging pipes, 14 whipping apptss, 15 mud evacuated tube, 16 outer tubes, pipe in 17,18 mud supernatant liquor imports, 19 waste gas go out pipe, 20 filter screens, 21 magnesium salt solution inlet pipes, 22 alkali lye inlet pipes, 23 air inlet pipes, 24 valves, 1,25 pH Controlling System, 26 pH meters, 27 effluent weirs, 28 effluent troughs, 29 valves, 30 replenish alkali lye inlet pipe, 31 throw out vent pipes.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is made further elaborating, but embodiment does not do any type of restriction to the present invention.
Embodiment 1
The structure of device: described device comprises anaerobic reaction device and struvite nitrogen and phosphorus recovery device, and anaerobic reaction device links to each other with the struvite nitrogen and phosphorus recovery device by mud supernatant dispatch tube 10;
Described anaerobic reaction device comprises the sludge anaerobic reactor 4 that is provided with mud inlet pipe 1 and mud evacuated tube 15, and sludge anaerobic reactor 4 is provided with into mud Controlling System 7, mud standing and reacting device 8, whipping appts 14, pH meter 5 and ORP meter 6; Mud inlet pipe 1 is provided with first sludge pump 2 and is located at first flow meter 3 between first sludge pump 2 and the sludge anaerobic reactor 4, describedly advances mud Controlling System 7 and comprises pH warning and ORP warning.In order to make mud can carry out good anaerobic reaction, fully phosphorus is discharged, described sludge anaerobic reactor 4 is the pot type anaerobic reactor.Mud standing and reacting device 8 is provided with whipping appts 14, coagulant dosage pipe 9 and sludge discharging pipe 13, sludge discharging pipe 13 be provided with second under meter 12 and be located at second under meter 12 and mud standing and reacting device 8 between second sludge pump 11.
Described phosphorus recovery device comprises interconnective double tube reactor and effluent trough 28, and double tube reactor comprises interior pipe 17 and the outer tube 16 that is nested with mutually.
Pipe 17 comprises top, upper, middle and lower in described, in pipe 17 top be provided with the top that mud supernatant liquor dispatch tube 10 and waste gas goes out pipe 19, interior pipe 17 and be provided with magnesium salt solution inlet pipe 21, alkali lye inlet pipe 22, also be provided with circular filter screen 20 between the magnesium salt solution inlet pipe 21 of interior pipe 17 and mud supernatant dispatch tube 10, the bottom of interior pipe 17 is provided with air inlet pipe 23 and pH meter 26.
Described outer tube 16 comprises top, reducing pipe connecting, bottom and bottom, and top is thick, the bottom is thin, connects by the reducing pipe connecting between the upper and lower, and the bottom is the struvite deposition region; The bottom of outer tube 13 is provided with and replenishes alkali lye inlet pipe 30, and the bottom of outer tube 16 is provided with throw out vent pipe 31, and the top of outer tube 16 is provided with effluent weir 27 and pH meter 26, the mud supernatant liquor through effluent weir 27 overflows to the effluent trough 28.
In order to realize the near real-time quantitative monitoring of whole device, all be provided with pH Controlling System 25 on described alkali lye inlet pipe 22 and the additional alkali lye inlet pipe 30, the pH Controlling System 22 of described alkali lye inlet pipe 22 links to each other with the pH meter 26 that interior pipe 17 lower ends are provided with by valve 24, the pH Controlling System 25 of described additional alkali lye inlet pipe 30 links to each other with the pH meter 26 that outer tube 16 tops are provided with by valve 29, pH meter 26 is surveyed the pH value reaction of solution in the double tube reactors to pH Controlling System 25, pH Controlling System 25 by-pass valve controls 24 and 29 switch.
Embodiment 2
The device that uses embodiment 1 to make up, the phosphorus that carries out excess sludge reclaims, and concrete grammar is as follows:
Excess sludge rises to through mud inlet pipe 1 by first sludge pump 2 from the backflow pump house and carries out anaerobic reaction the sludge anaerobic reactor 4, first flow meter 3 records advance the mud amount, control the start/stop time of sewage sludge pumps 2 by advancing mud Controlling System 7, and definite sludge anaerobic residence time.PH meter 5 and ORP meter 6 are arranged on the middle and lower part of sludge anaerobic reactor 4, and measurement feedback is guaranteed the sludge anaerobic effect to pH and the ORP warning advanced in the mud Controlling System 7.Simultaneously, be provided with agitator 14 in the sludge anaerobic reactor 4, guarantee that excess sludge mixes in sludge anaerobic reactor 4, improve the sludge anaerobic reaction effect.Excess sludge is through behind the anaerobic reaction, enter into mud standing and reacting device 8 from sludge anaerobic reactor 4 in the mode of overflow, add an amount of coagulating agent through coagulant dosage pipe 9 simultaneously, agitator with coagulating agent and anaerobism after mud stir, make mud produce flocculation sediment, improve the effect of mud solid-liquid separation.After stirring 10min, close agitator, mud leaves standstill 1h, the mud supernatant liquor that solid-liquid separation obtains clarifying.The mud supernatant liquor enters the phosphorus recovery part by mud supernatant liquor dispatch tube 10 and carries out next step reaction.Precipitating sludge is discharged into the sewage disposal biochemistry pool by second sludge pump 11 through sludge discharging pipe 13, simultaneously the second amount meter, 12 monitoring sludge discharges.
The mud supernatant liquor enters into the phosphorus recovery part by mud supernatant liquor dispatch tube 10.At inner middle part bubbling air, waste gas goes out pipe 19 by waste gas and discharges by blast main 23.Pipe 17 tops in the mud supernatant liquor is entered into by mud supernatant liquor dispatch tube 10, after circular filter screen 20 filtrations, most suspended particles obtain removing.Pipe 17 middle parts in clarification mud supernatant liquor enters into add an amount of magnesium chloride solution by magnesium salt solution inlet pipe 21 simultaneously, add sodium hydroxide solution by alkali lye inlet pipe 22, and the pH of pipe 17 middle part solution is 9.3 in regulating.Mud supernatant liquor, magnesium chloride solution and sodium hydroxide solution be fully reaction under the stirring action of air, further reacts the back transition in interior pipe 17 bottoms and enters sectional area and become big outer tube 16 gradually, carries out the precipitation of struvite crystals.Bottom at outer tube 16 replenishes an amount of alkali by replenishing alkali lye inlet pipe 30 again, makes the pH before the mud supernatant liquor is discharged from the effluent weir 27 on outer tube 16 tops reach 9.5.Reacted mud supernatant liquor is discharged to effluent trough 28 through effluent weir 27 overflows, and the struvite throw out is regularly discharged from outer tube 16 bottom settlings thing vent pipes 31, and it filters the back supernatant liquor and flows into Sewage treatment systems with the mud supernatant liquor of handling.
Be example with the excess sludge of handling certain sewage work's backflow pump house, the excess sludge background value is: sludge concentration 7500mg/L, and mud supernatant liquor ortho-phosphoric acid phosphorus concentration is 5mg/L, the supernatant liquor ammonia nitrogen concentration is 1.7mg/L.Adopt retrieving arrangement of the present invention and processing method to handle, the excess sludge treatment capacity is 1.5 tons/day, supernatant liquor ortho-phosphoric acid phosphorus concentration is discharged into 102.15mg/L behind the excess sludge process sludge anaerobic reactor, ammonia nitrogen concentration is discharged into 39.13mg/L, after the mud supernatant liquor recycled through the phosphorus recovery part, phosphorous recovery can reach more than 85%.Reclaim the struvite that obtains by this embodiment and can be used as fertilizer or industrial raw material use.

Claims (9)

1. the phosphorus recovery device of an excess sludge comprises nitrogen and phosphorus recovery device, it is characterized in that, also comprises the sludge anaerobic reactor that links to each other with nitrogen and phosphorus recovery device, and the sludge anaerobic reactor is provided with mud standing and reacting device.
2. according to the phosphorus recovery device of the described excess sludge of claim 1, it is characterized in that, described mud standing and reacting device is provided with coagulant dosage pipe, sludge discharging pipe and whipping appts, sludge discharging pipe be provided with second under meter and be located at second under meter and mud standing and reacting device between second sludge pump.
3. according to the phosphorus recovery device of the described excess sludge of claim 1, it is characterized in that described sludge anaerobic reactor also is provided with mud inlet pipe, mud evacuated tube, pH meter, ORP meter and advances the mud Controlling System; The mud inlet pipe is provided with the first sludge pump box and is located at first flow meter between first sludge pump and the sludge anaerobic reactor.
4. according to the phosphorus recovery device of the described excess sludge of claim 3, it is characterized in that, describedly advance the mud Controlling System according to the time of the monitoring Numerical Control sludge anaerobic reaction of pH meter, ORP meter, advance the mud Controlling System also according to the switch of the Data Control of advancing the mud amount first sludge pump of first flow meter record.
5. according to the phosphorus recovery device of the described excess sludge of claim 1, it is characterized in that described nitrogen and phosphorus recovery device comprises interconnective double tube reactor and effluent trough, double tube reactor comprises interior pipe and the outer tube of mutual socket.
6. according to the phosphorus recovery device of the described excess sludge of claim 1, it is characterized in that described nitrogen and phosphorus recovery device is the struvite nitrogen and phosphorus recovery device.
7. according to the phosphorus recovery device of the described excess sludge of claim 5, it is characterized in that described interior pipe is provided with the magnesium salt solution inlet pipe, also is provided with filter screen between magnesium salt solution inlet pipe and mud supernatant liquor dispatch tube.
8. according to the phosphorus recovery device of the described excess sludge of claim 5, it is characterized in that the top of described outer tube is provided with effluent weir.
9. according to the phosphorus recovery device of the described excess sludge of claim 1, it is characterized in that described sludge anaerobic reactor is the pot type anaerobic reactor.
CN2013101074991A 2013-03-30 2013-03-30 Phosphorus recovery device for excess sludge Pending CN103193370A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN108191182A (en) * 2018-01-18 2018-06-22 上海理工大学 A kind of method that municipal sludge extraction phosphorus is handled by the acid-hatching of young eggs
CN109020149A (en) * 2018-09-15 2018-12-18 东莞理工学院 A kind of sludge Resource recoveryization utilizes method and resource utilization device
CN110240242A (en) * 2019-04-23 2019-09-17 东莞理工学院 A method of gypsum being recycled except ammonia and simultaneously using guanite circulation
CN113698057A (en) * 2021-08-18 2021-11-26 华南理工大学 Method for recovering phosphorus from phosphorus-containing sludge by using glycine as phosphorus release agent

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JP4920016B2 (en) * 2008-09-12 2012-04-18 株式会社日立製作所 Control device and method of phosphorus recovery device by crystallization
CN102442750A (en) * 2011-12-31 2012-05-09 北京汉青天朗水处理科技有限公司 Sewage treatment systems and method
CN102964032A (en) * 2012-11-23 2013-03-13 北京市可持续发展促进会 Device and method for bypass phosphorus recovery of town sewage treatment plant
CN203112675U (en) * 2013-03-30 2013-08-07 中山大学 System for reclaiming phosphorus from residual sludge

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108191182A (en) * 2018-01-18 2018-06-22 上海理工大学 A kind of method that municipal sludge extraction phosphorus is handled by the acid-hatching of young eggs
CN109020149A (en) * 2018-09-15 2018-12-18 东莞理工学院 A kind of sludge Resource recoveryization utilizes method and resource utilization device
CN109020149B (en) * 2018-09-15 2021-07-09 东莞理工学院 Sludge recycling method and recycling device
CN110240242A (en) * 2019-04-23 2019-09-17 东莞理工学院 A method of gypsum being recycled except ammonia and simultaneously using guanite circulation
CN110240242B (en) * 2019-04-23 2020-02-11 东莞理工学院 Method for circularly removing ammonia and simultaneously recycling gypsum by using struvite
CN113698057A (en) * 2021-08-18 2021-11-26 华南理工大学 Method for recovering phosphorus from phosphorus-containing sludge by using glycine as phosphorus release agent

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Application publication date: 20130710