CN107814470A - The device and method of nitrogen phosphorus in a kind of electrochemical deposition recovery excess sludge - Google Patents
The device and method of nitrogen phosphorus in a kind of electrochemical deposition recovery excess sludge Download PDFInfo
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- CN107814470A CN107814470A CN201711066746.2A CN201711066746A CN107814470A CN 107814470 A CN107814470 A CN 107814470A CN 201711066746 A CN201711066746 A CN 201711066746A CN 107814470 A CN107814470 A CN 107814470A
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- excess sludge
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- reaction groove
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Electrochemistry (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses the device and method that a kind of electrochemical deposition reclaims nitrogen phosphorus in excess sludge, the device includes excess sludge pond, excess sludge anaerobic fermentation pond, zymotic fluid sedimentation basin, electrochemical reaction groove and water storage tank, electrochemical reaction groove built-in anode magnesium rod and negative carbon, the recovery of nitrogen phosphorus in excess sludge is realized by forming guanite.Reclaiming the method for nitrogen phosphorus in excess sludge using the device is：The anaerobic fermented liquid of excess sludge is introduced into electrochemical reaction groove ammonia nitrogen and phosphorus are provided, anodic magnesium rod provides Mg respectively with negative carbon generation electronics transfer under DC electric field effect2+And OH‑, reclaimed in taper settling zone free settling struvite crystallization thing, go to denitrogenate the supernatant overflow after phosphorus and be discharged into water storage tank.The synchronous recovery of nitrogen phosphorus in excess sludge can be achieved without additionally adding magnesium ion reagent for apparatus of the present invention, and recovery product has considerable economy.
Description
Technical field
The invention belongs to the recovery technology field of nitrogen phosphorus in excess sludge, and in particular to a kind of electrochemical deposition recovery is remaining
The device and method of nitrogen phosphorus in sludge.
Background technology
Municipal wastewater treatment plant realizes the removal of nitrogen phosphorus using Biological Nitrogen Removal Processe more at present.Phosphorus be vital movement can not or
Scarce element, and the leading factor of body eutrophication is caused, also it is a kind of non-renewable resources, its recovery is imperative.
The phosphorus of various forms in sewage is transferred in excess sludge by biological phosphate-eliminating by means of the effect of polyP bacteria, and eventually through spoil disposal
Realize the reduction of water outlet phosphorus concentration.Essentially, this be phosphorus position transfer, aqueous phase is transferred to mud phase.Realize the true of phosphorus
Positive remove then is needed by means of chemical mode, by forming phosphorus precipitation or crystallizing to realize.Removal for nitrogen, mainly by
Various forms of nitrogen are converted into N in nitrification and denitrification process2Be discharged into air, and during this because of the effect of microorganism and
Caused intermediate product N2O is also a kind of greenhouse gases.Therefore, it is necessary to which seeking a kind of effective way can remove nitrogen phosphorus dirt in sewage
Dye thing is simultaneously turned waste into wealth.In addition, excess sludge caused by denitrogenation dephosphorizing process is also a kind of secondary pollution material, it is necessary to enter
Row is rational to be handled with disposal to reduce its harm to environment and mitigate sewage plant operating pressure.
Ammoniomagnesium phosphate crystal method can be insoluble in by controlling magnesium ion in solution, ammonia nitrogen, phosphate concentration and pH value to be formed
The white crystal of water, i.e. guanite（MAP：MgNH4PO4 .6H2O）, it is synchronous to remove nitrogen and phosphorus pollutantses.As Mg in solution2+、NH4 +、
HnPO4 n-3Solubility product constant of the ion concentration product more than guanite（K sp：7.58×10−14-4.36×10−13）When will send certainly
Now precipitate, the precipitation is a kind of good slow-release fertilizer, can be agricultural directly as fertilizer.
Struvite crystallization is generally formed in the higher waste water of concentration of nitrogen and phosphorus, and in excess sludge anaerobic digestion process with
The release of the ammonia nitrogen and phosphorus of high concentration, magnesium salts can be added into its digestive juice to form guanite precipitation.Needed during this
Course of reaction is controlled by monitoring ammonia nitrogen and phosphate concentration in digestive juice, and by optimizing guanite formation condition, to carry
The utilization rate and sedimentation effect of high magnesium salts, process are cumbersome.The present invention handles excess sludge anaerobic digestion solution using electrochemical method,
The formation of struvite crystallization is realized by the transfer of anode and cathode electronics, without additionally adding magnesium ion reagent, and energy consumption is low, effect
It is good.
The content of the invention
Sunk present invention solves the technical problem that there is provided the electrochemistry that a kind of device structure is simple and operating cost is relatively low
Form sediment and reclaim the device and method of nitrogen phosphorus in excess sludge.
The present invention adopts the following technical scheme that to solve above-mentioned technical problem, in a kind of electrochemical deposition recovery excess sludge
The device of nitrogen phosphorus, it is characterised in that anti-including excess sludge pond, excess sludge anaerobic fermentation pond, zymotic fluid sedimentation basin, electrochemistry
Groove and water storage tank are answered, wherein excess sludge pond adds pump by pipeline and excess sludge and is connected with excess sludge anaerobic fermentation pond,
The dosing mouth on excess sludge anaerobic fermentation pond top adds pump by pipeline and alkaline agent and is connected with alkaline agent conservation tank, and excess sludge is detested
Agitator and pH meter are provided with aerobe fermentation pond, excess sludge anaerobic fermentation pond passes through pipeline and fermentation sludge pump and fermentation liquid precipitate
Pond is connected, and the supernatant in zymotic fluid sedimentation basin is discharged into electrochemical reaction groove, zymotic fluid sedimentation basin through top overflow launder and pipeline
Bottom precipitation is discharged through mud discharging mouth, and anodic magnesium rod and negative carbon, the anodic magnesium rod and negative electrode carbon are provided with electrochemical reaction groove
Rod is connected by wire with D.C. regulated power supply, and the guanite sediment in electrochemical reaction groove is through the free settling of taper settling zone
Guanite recovery is carried out to guanite recovery port, removes to denitrogenate the supernatant of phosphorus through top overflow launder and pipeline in electrochemical reaction groove
It is discharged into water storage tank.
Further preferably, 5mol/L sodium hydroxide solution is contained with the alkaline agent conservation tank.
A kind of method that nitrogen phosphorus in excess sludge is reclaimed using said apparatus electrochemical deposition, it is characterised in that specific steps
For：Excess sludge in excess sludge pond by excess sludge is added into pump be pumped into excess sludge anaerobic fermentation pond and carry out normal temperature
Anaerobism stirs, and it is 10-12d to control excess sludge SRT, while opens alkaline agent and add pump by the hydrogen-oxygen of 5mol/L in alkaline agent conservation tank
Change sodium solution to be pumped into excess sludge anaerobic fermentation pond by dosing mouth, the pH value of material in regulation excess sludge anaerobic fermentation pond
For 10 ± 0.5, efficiency is cracked for improve excess sludge；Periodically arranged according to excess sludge anaerobic fermentation pond SRT by fermenting
Sludge carries out separation of solid and liquid into zymotic fluid sedimentation basin after the fermentation of dredge pump discharge part, and later on excess sludge adds pump will be with
The isometric fresh excess sludge of sludge is pumped into excess sludge anaerobic fermentation pond from excess sludge pond after discharge fermentation is detested
Oxygen digests；Supernatant overflow in zymotic fluid sedimentation basin is discharged into electrochemical reaction groove, and zymotic fluid sedimentation basin lower floor body refuse passes through
Mud discharging mouth is discharged；Anodic magnesium rod and negative electrode are diametrically hung respectively at each 1/4 diameter of cell wall in electrochemical reaction groove
Carbon-point, the anodic magnesium rod are connected with negative carbon by wire with D.C. regulated power supply, and anodic magnesium rod betatopic obtains Mg2+, it is cloudy
Pole carbon-point obtains electronics and obtains OH-, zymotic fluid sedimentation basin supernatant provides ammonia nitrogen and phosphorus into electrochemical reaction groove, in electrochemistry
Taper settling zone in reactive tank forms guanite sediment and carries out guanite recovery by guanite recovery port, and electrochemistry is anti-
The supernatant overflow after removing to denitrogenate phosphorus in groove is answered to be discharged into water storage tank.
Further preferably, the leading indicator of excess sludge is in the excess sludge pond：MLSS=8000-9000mg/L,
MLVSS=5000-5500mg/L, pH=7-8.
The present invention has the advantages that compared with prior art：
1st, the present invention forms guanite to reclaim in excess sludge without additionally adding magnesium ion reagent using electrochemical principle
Nitrogen phosphorus, operating cost is reduced, energy consumption is relatively low, and precipitum purity is higher；
2nd, the present invention can be combined with denitrification dephosphorization system, and excess sludge, which is directly discharged into excess sludge anaerobic fermentation pond, to be located
Reason, realize minimizing and the recycling of excess sludge；
3rd, go the digestive juice for denitrogenating phosphorus to can act also as the carbon source of denitrogenation dephosphorizing in the present invention, reduce adding for additional carbon, improve
The operational effect of denitrification dephosphorization system.
Brief description of the drawings
Fig. 1 is the structural representation of device in the present invention.
In figure：1- excess sludges pond, 1-1- excess sludges add pump, 2- excess sludge anaerobic fermentations pond, the storage of 2-1- alkaline agents
Standby tank, 2-2- alkaline agents add pump, 2-3- dosing mouths, 2-4- agitators, 2-5-pH meters, 2-6- fermentation sludge pumps, and 3- zymotic fluids sink
Shallow lake pond, 3-1- mud discharging mouths, 4- electrochemical reaction grooves, 4-1- anodic magnesium rods, 4-2- negative carbons, 4-3- D.C. regulated power supplies, 4-
4- tapers settling zone, 4-5- guanite recovery ports, 5- water storage tanks.
Embodiment
The above of the present invention is described in further detail by the following examples, but this should not be interpreted as to this
The scope for inventing above-mentioned theme is only limitted to following embodiment, and all technologies realized based on the above of the present invention belong to this hair
Bright scope.The present invention is described in detail by way of example and in conjunction with the accompanying drawings.
Referring to the drawings 1, a kind of electrochemical deposition reclaims the device of nitrogen phosphorus in excess sludge, including excess sludge pond 1, residue
Sludge anaerobic fermentation vat 2, zymotic fluid sedimentation basin 3, electrochemical reaction groove 4 and water storage tank 5, wherein excess sludge pond 1 pass through pipeline
And excess sludge adds pump 1-1 and is connected with excess sludge anaerobic fermentation pond 2, the dosing mouth on the top of excess sludge anaerobic fermentation pond 2
2-3 adds pump 2-2 by pipeline and alkaline agent and is connected with alkaline agent conservation tank 2-1, is contained with 5mol/L's in alkaline agent conservation tank 2-1
Sodium hydroxide solution, excess sludge anaerobic fermentation pond 2 is interior to be provided with agitator 2-4 and pH meter 2-5, excess sludge anaerobic fermentation pond 2
It is connected by pipeline and fermentation sludge pump 2-6 with zymotic fluid sedimentation basin 3, the supernatant in zymotic fluid sedimentation basin 3 is through top overflow
Groove and pipeline are discharged into electrochemical reaction groove 4, and the bottom precipitation of zymotic fluid sedimentation basin 3 is discharged through mud discharging mouth 3-1, electrochemical reaction groove 4
The interior anodic magnesium rod 4-1 and negative carbon 4-2, anodic magnesium rod 4-1 and negative carbon 4-2 of being provided with passes through wire and DC voltage-stabilizing electricity
Source 4-3 is connected, and the guanite sediment in electrochemical reaction groove 4 is through taper settling zone 4-4 free settlings to guanite recovery port
4-5 carries out guanite recovery, goes the supernatant for denitrogenating phosphorus to be discharged into water storage tank through top overflow launder and pipeline in electrochemical reaction groove 4
5。
The dischargeable capacity in the excess sludge anaerobic fermentation pond 2 is 10L, zymotic fluid sedimentation basin 3 and electrochemical reaction groove 4
Dischargeable capacity is 5L, and is all made up by circle and of pmma material, and excess sludge pond 1 and water storage tank 5 are by PVC plastic system
Into.Excess sludge is derived from A2O process spent waters treatment plant second pond sludge, after appropriate dilution, leading indicator is as follows：MLSS=
8000-9000mg/L, MLVSS=5000-5500mg/L, pH=7-8.
The method of nitrogen phosphorus, is comprised the following steps that in electrochemical deposition recovery excess sludge of the present invention：
The excess sludge that concentration in excess sludge pond 1 is 8000mg/L or so is added into pump 1-1 by excess sludge and is pumped into residue
Normal temperature anaerobism stirring is carried out in sludge anaerobic fermentation vat 2, it is 10-12d to control excess sludge SRT, while opens alkaline agent and add pump
The sodium hydroxide solution of 5mol/L in alkaline agent conservation tank 2-1 is put into excess sludge anaerobic fermentation pond by 2-2 by dosing mouth 2-3
In 2, the pH value of material is 10 ± 0.5 in regulation excess sludge anaerobic fermentation pond 2, and efficiency is cracked for improve excess sludge；
Sludge after sludge pump 2-6 discharge parts fermentation of fermenting to the liquid precipitate that ferments periodically is passed through according to excess sludge anaerobic fermentation pond SRT
Separation of solid and liquid is carried out in pond 3, later on excess sludge adds the fresh residue that sludge is isometric after pump 1-1 will ferment with discharge
Sludge is pumped into excess sludge anaerobic fermentation pond 2 from excess sludge pond 1 and carries out anaerobic digestion；Supernatant in zymotic fluid sedimentation basin 3
Hydrorrhea stream is discharged into electrochemical reaction groove 4, and the lower floor's body refuse of zymotic fluid sedimentation basin 3 is then discharged by mud discharging mouth 3-1；Electrochemical reaction
Anodic magnesium rod 4-1 and negative carbon 4-2 are diametrically hung respectively at each 1/4 diameter of cell wall in groove 4, and size is Φ
3cm × 20cm, anodic magnesium rod 4-1 and negative carbon 4-2 are connected by copper conductor with 3.6V D.C. regulated power supplies 4-3, anode magnesium
Rod 4-1 betatopics obtain Mg2+, negative carbon 4-2 obtain electronics obtain OH-, the supernatant of zymotic fluid sedimentation basin 3 enters electrochemical reaction
Groove 4 provides ammonia nitrogen and phosphorus, as Mg in solution2+、NH4 +、HnPO4 n-3Solubility product constant of the ion concentration product more than guanite
Guanite precipitation is spontaneously formed, is settled in electrochemical reaction groove 4 through taper settling zone 4-4 and passes through guanite recovery port 4-5
Guanite recovery is carried out, goes to denitrogenate the supernatant overflow after phosphorus in electrochemical reaction groove 4 and is discharged into water storage tank 5.
Have been shown and described above the general principle of the present invention, principal character and advantage, do not depart from spirit of the invention and
On the premise of scope, the present invention also has various changes and modifications, and these changes and improvements both fall within claimed invention
Scope.
Claims (4)
1. the device of nitrogen phosphorus in a kind of electrochemical deposition recovery excess sludge, it is characterised in that including excess sludge pond, remaining dirt
Mud anaerobic fermentation pond, zymotic fluid sedimentation basin, electrochemical reaction groove and water storage tank, wherein excess sludge pond pass through pipeline and remaining dirt
Mud adds pump and is connected with excess sludge anaerobic fermentation pond, and the dosing mouth on excess sludge anaerobic fermentation pond top passes through pipeline and alkaline agent
Add pump with alkaline agent conservation tank to be connected, agitator and pH meter, excess sludge anaerobic fermentation are provided with excess sludge anaerobic fermentation pond
Pond is connected by pipeline and fermentation sludge pump with zymotic fluid sedimentation basin, the supernatant in zymotic fluid sedimentation basin through top overflow launder and
Pipeline is discharged into electrochemical reaction groove, and zymotic fluid sedimentation basin bottom precipitation is discharged through mud discharging mouth, and anode is provided with electrochemical reaction groove
Magnesium rod and negative carbon, the anodic magnesium rod is connected with negative carbon by wire with D.C. regulated power supply, in electrochemical reaction groove
Guanite sediment carry out guanite recovery through taper settling zone free settling to guanite recovery port, in electrochemical reaction groove
The supernatant for denitrogenating phosphorus is gone to be discharged into water storage tank through top overflow launder and pipeline.
2. the device of nitrogen phosphorus in electrochemical deposition recovery excess sludge according to claim 1, it is characterised in that：The alkali
5mol/L sodium hydroxide solution is contained with agent conservation tank.
3. a kind of method that usage right requires nitrogen phosphorus in 1 described device electrochemical deposition recovery excess sludge, it is characterised in that
Concretely comprise the following steps：The excess sludge in excess sludge pond is added into pump by excess sludge to be pumped into excess sludge anaerobic fermentation pond
Normal temperature anaerobism stirring is carried out, it is 10-12d to control excess sludge SRT, while opens alkaline agent and add pump by alkaline agent conservation tank
5mol/L sodium hydroxide solution is pumped into excess sludge anaerobic fermentation pond by dosing mouth, adjusts excess sludge anaerobic fermentation
The pH value of material is 10 ± 0.5 in pond, and efficiency is cracked for improve excess sludge；According to excess sludge anaerobic fermentation pond SRT
Separation of solid and liquid, later on residue are periodically carried out into zymotic fluid sedimentation basin by sludge after sludge pump discharge part fermentation of fermenting
Sludge adds the fresh excess sludge that sludge is isometric after pump will ferment with discharge and is pumped into excess sludge anaerobism from excess sludge pond
Anaerobic digestion is carried out in fermentation vat；Supernatant overflow in zymotic fluid sedimentation basin is discharged into electrochemical reaction groove, and ferment liquid precipitate
Pond lower floor body refuse is discharged by mud discharging mouth；Diametrically hung respectively at each 1/4 diameter of cell wall in electrochemical reaction groove
Anodic magnesium rod and negative carbon, the anodic magnesium rod are connected with negative carbon by wire with D.C. regulated power supply, and anodic magnesium rod loses
Electronics obtains Mg2+, negative carbon obtain electronics obtain OH-, zymotic fluid sedimentation basin supernatant provides ammonia into electrochemical reaction groove
Nitrogen and phosphorus, the taper settling zone in electrochemical reaction groove form guanite sediment and carry out birds droppings by guanite recovery port
Stone reclaims, and goes to denitrogenate the supernatant overflow after phosphorus in electrochemical reaction groove and is discharged into water storage tank.
4. the method for nitrogen phosphorus in electrochemical deposition recovery excess sludge according to claim 3, it is characterised in that described surplus
The leading indicator of excess sludge is in remaining sludge-tank：MLSS=8000-9000mg/L, MLVSS=5000-5500mg/L, pH=7-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711066746.2A CN107814470A (en) | 2017-11-02 | 2017-11-02 | The device and method of nitrogen phosphorus in a kind of electrochemical deposition recovery excess sludge |
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| CN201711066746.2A CN107814470A (en) | 2017-11-02 | 2017-11-02 | The device and method of nitrogen phosphorus in a kind of electrochemical deposition recovery excess sludge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751359A (en) * | 2018-06-20 | 2018-11-06 | 哈尔滨工业大学 | The method that immersion electrochemical in-situ is enriched with nutritive salt device and removes nutritive salt in surface water |
| CN108786717A (en) * | 2018-06-12 | 2018-11-13 | 河南师范大学 | A kind of preparation method of modified copper water-supply pipe particle and its application in going water removal on phosphate |
| CN113354083A (en) * | 2021-07-12 | 2021-09-07 | 中国科学院生态环境研究中心 | Device and method for synchronously recycling struvite in anaerobic membrane biological sewage treatment |
| CN114702975A (en) * | 2022-04-13 | 2022-07-05 | 河南师范大学 | Preparation method and application of two-step sulfur-doped sludge biochar |
| CN115043563A (en) * | 2022-06-28 | 2022-09-13 | 广州市市政工程设计研究总院有限公司 | Device and method for strengthening anaerobic fermentation of excess sludge and strengthening nitrogen and phosphorus removal of sewage by fermentation liquor backflow |
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| CN105174452A (en) * | 2015-07-19 | 2015-12-23 | 北京工业大学 | Apparatus for reinforcing nitrogen and phosphorus removal coupling and sludge reduction of low C/N ratio municipal domestic sewage by using carbon source in sludge, and method thereof |
| CN205575731U (en) * | 2016-04-22 | 2016-09-14 | 浙江大学 | A device for retrieving waste water nitrogen phosphorus |
| CN207418555U (en) * | 2017-11-02 | 2018-05-29 | 河南师范大学 | The device of nitrogen phosphorus in a kind of electrochemical deposition recycling excess sludge |
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2017
- 2017-11-02 CN CN201711066746.2A patent/CN107814470A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105174452A (en) * | 2015-07-19 | 2015-12-23 | 北京工业大学 | Apparatus for reinforcing nitrogen and phosphorus removal coupling and sludge reduction of low C/N ratio municipal domestic sewage by using carbon source in sludge, and method thereof |
| CN205575731U (en) * | 2016-04-22 | 2016-09-14 | 浙江大学 | A device for retrieving waste water nitrogen phosphorus |
| CN207418555U (en) * | 2017-11-02 | 2018-05-29 | 河南师范大学 | The device of nitrogen phosphorus in a kind of electrochemical deposition recycling excess sludge |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108786717A (en) * | 2018-06-12 | 2018-11-13 | 河南师范大学 | A kind of preparation method of modified copper water-supply pipe particle and its application in going water removal on phosphate |
| CN108751359A (en) * | 2018-06-20 | 2018-11-06 | 哈尔滨工业大学 | The method that immersion electrochemical in-situ is enriched with nutritive salt device and removes nutritive salt in surface water |
| CN108751359B (en) * | 2018-06-20 | 2021-10-08 | 哈尔滨工业大学 | Immersed electrochemical in-situ nutrient salt enrichment device and method for removing nutrient salt in surface water |
| CN113354083A (en) * | 2021-07-12 | 2021-09-07 | 中国科学院生态环境研究中心 | Device and method for synchronously recycling struvite in anaerobic membrane biological sewage treatment |
| CN114702975A (en) * | 2022-04-13 | 2022-07-05 | 河南师范大学 | Preparation method and application of two-step sulfur-doped sludge biochar |
| CN114702975B (en) * | 2022-04-13 | 2023-10-17 | 河南师范大学 | Preparation method and application of two-step sulfur-doped sludge biochar |
| CN115043563A (en) * | 2022-06-28 | 2022-09-13 | 广州市市政工程设计研究总院有限公司 | Device and method for strengthening anaerobic fermentation of excess sludge and strengthening nitrogen and phosphorus removal of sewage by fermentation liquor backflow |
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Application publication date: 20180320 |