CN105271625A - Cleaner production method for improving residual activated sludge resource energy recovery rate - Google Patents
Cleaner production method for improving residual activated sludge resource energy recovery rate Download PDFInfo
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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
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- 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
Abstract
A cleaner production method for improving residual activated sludge resource energy recovery rate is disclosed, and the method comprises the following steps: (1) sludge is pressed until the sludge has a moisture content of 75-80%; (2) the pressed sludge is remixed and soaked with water according to the ratio of 1g to 3-5ml for 2h; (3) the above mixture is stirred and aerated, after 12-72h, the stirred and aerated mixture is naturally sedimented; (4) supernatant in the step (3) is discharged into a MAP precipitation reactor, magnesium salt and phosphate salt solutions are added for adjusting the molar ratio of P to Mg to N being 1 to 1.2 to 1, 5MNaOH is used for adjusting the pH of the reaction solution to 8.9 +/-0 .1, the supernatant after precipitation is discharged into an anaerobic regulation pool, precipitate is discharged into a separation recovery device for recovering the precipitate; and (5) supernatant after MAP precipitation in the step (4) and precipitated bottom sediment after natural sedimentation in the step (3) are respectively discharged into the anaerobic regulation pool for further fermentation to produce methane to recover energy. The method is easy to operate and simple, no new chemical substance is introduced, and the running cost is low.
Description
Technical field
The present invention relates to a kind of clean preparation method improving the residual active sludge energy resource rate of recovery, realize sewage work high efficiente callback resource, energy targets from residual active sludge, belonging to residual active sludge process and resource technology field, is a kind of cleaner production new technology.
Background technology
The sewage work in the whole nation about 86.2% adopts activated sludge process, and the residual active sludge volume ratio produced in treating processes accounts for 0.3% ~ 0.5% of sewage disposal total amount, and process disposal costs accounts for more than the 40%-60% of sewage disposal running cost usually.The processing mode that present stage generally adopts is based on refuse tip landfill stabilization or in Sewage Plant Anaerobic Digestion.Sludge dewatering is carried out to the landfill place of landfill stabilization needs is large, mud trucking costs is high, and easily produce the secondary pollution problem such as groundwater pollution and foul smell dissipation; And the simple anaerobic digestion process for active sludge is not to its resource recycling.Organic content in active sludge is about 60%, biological easily degraded organic constituent is more than 40%, phosphorus accounts for 5.0% of mud dry weight, the content of nitrogen element more horn of plenty is about 8-9.3%, therefore contain resource greatly in active sludge, first process should consider the recycling of resource and the energy in disposing.
The pretreatment mode of economical and efficient has very important effect to raising recycling sludge recovery energy.The sludge pre-treatment method of current report has microwave method, supersonic method, heating method, freeze-thaw method, high pressure homogenization method, pearl mill method, Ozonation, wet oxidation process, acid system and biology crack method and enzyme process etc., respectively feature is had to the effect that cracks of mud, but it is high to equipment requirements during practical application, there is the problem such as complicated operation and potential safety hazard, a lot of technology is difficult to carry out engineer applied.Chinese invention patent " sludge carbon source two-stage alkaline hydrolysis acidizing recovery method " (CN101708932B), Chinese invention patent " alkaline hydrolysis pre-treatment-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge " (201310708860.6) utilizes alkaline hydrolysis pre-treatment to carry out recycling to residual active sludge, the pre-treatment of alkaline hydrolysis mode can promote that mud melts born of the same parents' liberating nitrogen phosphorus, good effect is had to sludge reduction, but sludge liquid colourity is all very heavy after alkaline purification, such as after 5%NaOH lignin-sludge, supernatant liquor presents chocolate, and containing a large amount of Na in alkaline purification
+, OH
-etc. causing, supernatant liquor salinity is large, alkalescence is high, and can increase subsequent disposal effluent color dilution, salinity, be unfavorable for discharged wastewater met the national standard, particularly treatment solution pH value is high, is unfavorable for follow-up Anaerobic Digestion, cannot realize comprehensive specific resistance to filtration and recycling.
The present invention utilizes Sewage Plant to carry out the mechanical dehydration facility of minimizing process to mud, i.e. Sewage Plant conventional machinery dehydration equipment: plate-and-frame filter press, vacuum filter, belt filter press and whizzer etc., filtration squeezing is carried out to mud, the effect of mechanical force can cause mud granule to extrude and crack, mud flocculation structure is destroyed, microorganism cells cracking, intracellular organic matter flows out.Contriver finds that the mud crossed by mechanical expression mixes rear phenomenon of melting the materials such as born of the same parents' liberating nitrogen phosphorus again with water, particularly under micro-aeration agitation effect its melt born of the same parents' liberating nitrogen, phosphorus concentration far above alkaline hydrolysis in nitrogen, the maximum release concentration of phosphorus, dissolved organic matter (SCOD) also improves about 70%, plays an important role for later stage anaerobic methane production efficiency improves.Therefore sludge treatment technique route is changed, with the technological line of " sludge pressing dehydration-remix-aeration agitation-MAP precipitation-anaerobically fermenting ", resource utilization recycling is carried out to residual active sludge, the defect of alkaline hydrolysis process can be overcome, nitrogen phosphor resource and the methane energy rate of recovery are improved 2-3 doubly, the annual mud discharging volume of final Sewage Plant reduces 70-90%, is the new technology of a kind of clean and effective Resource recovery energy from mud.Compared with other treatment technologies, the present invention utilizes Sewage Plant existing utility to reach the target of mud recycling, easy to operate, with acid, alkaline purification liquid phase ratio, do not introduce new chemical substance, treatment solution is close with raw waste water color, and the recovery of sludge resource and the energy makes Sewage Plant running cost reduce 20-40%, reaches the target that Sewage Plant implements cleaner production.
Summary of the invention
Current sewage work lacks the technical matters of residual active sludge resource utilization, energy recycling, and the gap very large in addition with implementing cleaner production, the invention provides a kind of clean preparation method improving the residual active sludge energy resource rate of recovery.
Change current sludge treatment technique route, utilize Sewage Plant mechanical dehydration facility as sludge disintegration method, squeezing mud after mechanical dehydration is mixed with certain mass volume ratio with water again and soaks, by mud nitrogen phosphorus substance being discharged in mixed solution to aeration agitation mode particular design, mixed solution concentration of nitrogen and phosphorus can be made respectively up to 420-490mg/L and more than 120-210mg/L, exceed 30-180mg/L and 20-150mg/L ammonia nitrogen and orthophosphoric acid salt concentration in alkaline hydrolysis technique.Utilize the MAP precipitator method and Chinese patent 201420458242.0 " a kind of device phosphorus in waste water nitrogen being carried out to the recovery of struvite resource utilization " to carry out Separation and Recovery to this nitrogen phosphorus precipitation further to mixing liquid nitrogen phosphorus to utilize as slow-release fertilizer, the rate of recovery of ammonia nitrogen is 86-95%, the rate of recovery of dissolved phosphorus is 90-99%, to the rate of recovery 40-60% of mud total nitrogen phosphorus, all higher than alkaline hydrolysis treatment process nitrogen phosphorous recovery.To reclaim after nitrogen phosphorus by mud further by anaerobically fermenting methane phase recovered energy, methane high specific factor of created gase is up to 1.03-1.38L/(gVS), higher than conventional anaerobic technique methane production.Methane gas is burnt heat production or generating can and the high efficiente callback of nitrogen phosphorus can effectively reduce Sewage Plant 20-40% running cost.Residual active sludge is after recycle of the present invention, and final annual mud discharging volume reduces 70-90%, is the new technology of a kind of clean and effective Resource recovery energy from mud, achieves the theory of sewage work's cleaner production.
Based on above-mentioned, the invention provides a kind of clean preparation method improving the residual active sludge energy resource rate of recovery, the method comprises:
(1) water ratio squeezed to mud mud is 75-80%;
(2) mud and the water after squeezing is mixed again in 1g/3-5ml ratio soak 2h;
(3) above-mentioned mixed solution is stirred and aeration, after 12-72h, natural subsidence is carried out to the mixed solution after stirring aeration;
(4) supernatant liquor in step (3) is entered in MAP precipitation reactor by adding magnesium salt solution and microcosmic salt solution, adjustment P/Mg/N mol ratio 1/1.2/1, under the condition stirred, reacting solution pH value 8.9 ± 0.1 is regulated with 5MNaOH, make nitrogen phosphorus in supernatant liquor that MAP precipitin reaction occur, supernatants after precipitation is entered anaerobism equalizing tank, precipitation is discharged into separating and reclaiming device and reclaims precipitation;
(5) the precipitation bed mud after natural subsidence in the supernatant liquor after MAP precipitation in step (4) and step (3) is entered anaerobism equalizing tank respectively, enter anaerobic reactor after utilizing the alkali in precipitation bed mud that mixed solution pH value is adjusted to 7.9-8.5 by mixing, fermentation methane phase reclaims the energy further.
In step (3), stir speed (S.S.) 150-400rpm, alr mode stops 5 seconds for often turning 10 seconds, and aeration rate is 3L/L min.
In step (3), the concentration measuring ammonia nitrogen and dissolved phosphorus in the supernatant liquor after natural subsidence reaches 420-490mg/L and 120-210mg/L respectively, and supernatant liquor at 3500-6400mg/L, then is entered MAP precipitation reactor by SCOD.
In step (4), alr mode is after 800rpm stirs 5 minutes, reduces to 200rpm and stirs 15 minutes, stops stirring postprecipitation 2-3h.
The mass percent concentration of described magnesium salt solution is 17%, and described magnesium salt solution is MgCl
2solution, MgSO
4one in solution and MgO solution; The mass percent concentration of described microcosmic salt solution is 5%, and described microcosmic salt solution is NaH
2pO
4solution, Na
2hPO
4solution, Na
3pO
4solution, KH
2pO
4solution and K
2hPO
4one in solution.
The mechanical means of squeezing mud is that sewage work carries out all kinds of devices of mechanical dehydration, as vacuum filter, plate-and-frame filter press, belt filter press or whizzer to mud.Carry out filtration squeezing to mud, the effect of mechanical force can cause mud granule to extrude and crack, and mud flocculation structure is destroyed, microorganism cells cracking, and intracellular organic matter flows out.
In above-mentioned, can be the draining of Sewage Plant second pond with mud blending water, Sewage Plant fresh water consumption can be saved like this, reduce total amount of sewage discharge simultaneously.
In above-mentioned, described excess sludge is residual active sludge, concentration basin mud, dewatered sludge and anaerobically digested sludge in the second pond of municipal sewage plant or mud storage pool, comprises treated excess sludge; Described process comprise acid, alkali, heat, ozone, ultrasonic in more than one.
Above-mentioned muddy water mixed solution is stirred and aeration, makes mud granule melt born of the same parents further and crack, promote that the stripping of mud extracellular polymeric or mud cytoclasis release Dissolve N and P, dissolved organic carbon, polysaccharide, protein etc. enter in mixed solution.
Described anaerobic reactor is complete hybrid anaerobic reactor, up-flow anaerobic sludge blanket, anaerobic filter, anaerobic baffle reactor, anaerobic expanded granular sludge bed or Anaerobic Sequencing Bath Reactor.The solid-liquid ratio 1/3-1/5 of each charging after reactor runs well, COD more than clearance 85-90%, methane high specific factor of created gase reaches 1.03-1.38L/(gVS).In anaerobic reactor, mud finally carries out landfill disposal again after mechanical dehydration, and compared with residual active sludge after initial mechanical is dewatered, VSS reduces 80-90%, and annual final mud discharging volume reduces 70-90%.Greatly reduce sewage plant sludge process disposal costs, the high efficiente callback of methane gas burning heat production or generating energy and nitrogen phosphorus can effectively reduce Sewage Plant 20-40% running cost, achieves the theory of sewage work's cleaner production.
The present invention has following positively effect:
(1) for sewage work provides a whole set of clearer production technology route to residual active sludge recycling, the technological deficiency that current Sewage Plant utilizes residual active sludge is made up.Compared with current alkaline hydrolysis technique, fully realize the target that nitrogen phosphor resource in mud and high efficiency of energy are recycled, and do not introduce new pollutent, there is significant economic benefit, environmental benefit.
(2) utilize Sewage Plant mechanical dewatering equipment to reach effect that mud melts born of the same parents' liberating nitrogen phosphorus, do not add the chemical substance such as acid, alkali, again 2h is soaked after being mixed in 1g/3-5ml ratio with water by mud after dehydration, to nitrogen Phosphurus release concentration respectively up to 370-550mg/L and more than 170-300mg/L, higher than 30-180mg/L and 20-150mg/L ammonia nitrogen in alkaline hydrolysis pre-treatment and orthophosphoric acid salt concentration, and be the draining of Sewage Plant second pond with mud blending water, high degree is saved Sewage Plant fresh water consumption, is reduced total amount of sewage discharge simultaneously.
(3) squeezing mud and water are mixed bed mud after stirring aeration and mix with MAP supernatants after precipitation by the present invention again, effectively reach the object regulating anaerobically fermenting water inlet pH value, utilize the alkali neutralising capacity of mud self, save sour consumption, after overcoming alkaline hydrolysis process, sludge pH is high, need acid adding to regulate one large defect.
(4) after the technology of the present invention route processing, the mud of final discharge is compared with initial residual active sludge, and VSS reduces 80-90%, and final discharge volume reduces 70-90%, can greatly reduce sludge treatment expense than existing technique.
Embodiment
Embodiment one:
By the residual active sludge of municipal sewage plant's second pond through centrifuge dewatering effect, moisture percentage in sewage sludge 78.1%, this mud 100g and 400mL secondary clarifier effluent mix stirring aeration tank, open aerating apparatus and regulate tolerance 3L/L min, open whipping appts and control stir speed (S.S.) 300rpm, alr mode is that namely pulse interval type often turns 10 seconds and stop 5 seconds.The sampling analysis when the treatment time is respectively 12h, 24h, 48h, 72h, 90h, 110h, measure Dissolve N and P concentration in supernatant liquor, be respectively 428.8mg/L and 120.9mg/L when treatment time 12h, SCOD is 3806.7mg/L.Along with the prolongation in treatment time, during 72h, ammonia nitrogen concentration is 458.2mg/L, and dissolved phosphorus concentration reaches 199.2mg/L, and SCOD is 5842.6mg/L.
After being precipitated by this mixed solution, water outlet enters in MAP precipitation reactor, adds 5%Na
3pO
4solution and 17%MgCl
2solution, P/Mg/N mol ratio is made to be 1/1.2/1, reacting solution pH value 9.0 is regulated with 5MNaOH, stir when adding medicament, alr mode is after 800rpm stirs 5 minutes, reduce to 200rpm stirs 15 minutes, stop stirring postprecipitation 3h, in supernatant liquor, the rate of recovery of ammonia nitrogen is 89%, and the rate of recovery of dissolved phosphorus is 93.9%.Separation and Recovery is carried out to the precipitation Chinese patent 201420458242.0 " a kind of device phosphorus in waste water nitrogen being carried out to the recovery of struvite resource utilization " generated, to record in precipitation magnesium ammonium phosphate content more than 93.3%.
Bed mud and MAP supernatants after precipitation after above-mentioned stirring aeration are mixed in anaerobism equalizing tank, mixed solution pH value 8.37, enter Anaerobic Sequencing Bath Reactor again, inoculation anaerobic sludge starts reactor, the solid-liquid ratio 1/3-1/5 of each charging after reactor runs well, COD more than clearance 85-90%, methane high specific factor of created gase 1.13-1.27L/(gVS).Discharge mud in anaerobic reactor and finally after mechanical dehydration, carry out landfill disposal again, compared with initial residual active sludge, VSS reduces 80-90%, and discharge volume reduces 70-90%.Greatly reduce specific resistance to filtration expense, achieve the theory of sewage work's cleaner production.
Carry out mud alkaline hydrolysis process contrast technique simultaneously, getting each 400ml of second pond residual active sludge is distributed in 1000ml wide-mouth reagent bottle, add 5%NaOH solution respectively, be respectively 12h, 24h, 48h, 72h, 90h, 110h time-division in the treatment time to take a morsel alkaline purification liquid carry out centrifugation to it, then measure Dissolve N and P concentration in supernatant liquor and be respectively 67.5mg/L and 70.1mg/L, far below concentration of nitrogen and phosphorus in the present invention.After process 12h, the treatment solution colourity of alkali is all very heavy, present chocolate, and in aeration agitation pond of the present invention, supernatant liquor is close with raw waste water color.Containing a large amount of Na in alkaline purification
+, OH
-ion causes supernatant liquor salinity large, can increase subsequent disposal effluent color dilution, salinity, be unfavorable for discharged wastewater met the national standard.
The present invention is easy to operation, do not introduce new chemical substance, with alkaline purification liquid phase ratio, mud nitrogen phosphorous recovery is improved considerably, and eventually pass through anaerobic methane production recovery mass energy, make the final discharge volume of mud reduce 70-90%, greatly reduce specific resistance to filtration expense, achieve the theory of sewage work's cleaner production.
Embodiment two:
By the residual active sludge of municipal sewage plant's second pond through centrifuge dewatering effect, moisture percentage in sewage sludge 78.1%, this mud 300g and 1200mL secondary clarifier effluent mix stirring aeration tank, open aerating apparatus and regulate tolerance 3L/L min, open whipping appts and control stir speed (S.S.) 300rpm, alr mode is that namely pulse interval type often turns 10 seconds and stop 5 seconds.The sampling analysis when the treatment time is respectively 12h, 24h, 48h, 72h, 90h, 110h, measure dissolved phosphorus nitrogen concentration in supernatant liquor, 430.5mg/L and 122.4mg/L is respectively when treatment time 12h, SCOD is 3901.2mg/L, along with the prolongation in treatment time, during 72h, ammonia nitrogen concentration is 468.1mg/L, and dissolved phosphorus concentration reaches 219.2mg/L, and SCOD is 6012.6mg/L.
After being precipitated by this mixed solution, water outlet enters in MAP precipitation reactor, adds 5%Na
3pO
4solution and 17%MgCl
2solution, P/Mg/N mol ratio is made to be 1/1.2/1, reacting solution pH value 8.95 is regulated with 5MNaOH, stir when adding medicament, alr mode is after 800rpm stirs 5 minutes, reduce to 200rpm stirs 15 minutes, and stop stirring postprecipitation 3h, in supernatant liquor, the rate of recovery of ammonia nitrogen is 87.4%, the rate of recovery of dissolved phosphorus is 94.1%.Separation and Recovery is carried out to the precipitation Chinese patent 201420458242.0 " a kind of device phosphorus in waste water nitrogen being carried out to the recovery of struvite resource utilization " generated, to record in precipitation magnesium ammonium phosphate content more than 94.5%.
Bed mud and MAP supernatants after precipitation after above-mentioned stirring aeration are mixed in anaerobism equalizing tank, mixed solution pH value 8.29, enter Anaerobic Sequencing Bath Reactor again, inoculation anaerobic sludge starts reactor, the solid-liquid ratio 1/3-1/5 of each charging after reactor runs well, COD more than clearance 85-90%, methane high specific factor of created gase 1.18-1.38L/(gVS).In anaerobic reactor, mud finally carries out landfill disposal again after mechanical dehydration, and compared with initial residual active sludge, VSS reduces 80-90%, and discharge volume reduces 70-90%.Greatly reduce specific resistance to filtration expense, achieve the theory of sewage work's cleaner production.
Carry out mud alkaline hydrolysis process contrast technique simultaneously, getting each 800ml of second pond residual active sludge is distributed in 2000ml wide-mouth reagent bottle, add 5%NaOH solution respectively, be respectively 12h, 24h, 48h, 72h, 90h, 110h time-division in the treatment time to take a morsel alkaline purification liquid carry out centrifugation to it, then measure Dissolve N and P concentration in supernatant liquor and be respectively 72.5mg/L and 68.2mg/L, far below concentration of nitrogen and phosphorus in the present invention.After process 12h, the treatment solution colourity of alkali is all very heavy, present chocolate, and in aeration agitation pond of the present invention, supernatant liquor is close with raw waste water color.Containing a large amount of Na in alkaline purification
+, OH
-ion causes supernatant liquor salinity large, can increase subsequent disposal effluent color dilution, salinity, be unfavorable for discharged wastewater met the national standard.
The present invention is easy to operation, do not introduce new chemical substance, with alkaline purification liquid phase ratio, mud nitrogen phosphorous recovery is improved considerably, and eventually pass through anaerobic methane production recovery mass energy, make the final discharge volume of mud reduce 70-90%, greatly reduce specific resistance to filtration expense, achieve the theory of sewage work's cleaner production.
Claims (7)
1. improve a clean preparation method for the residual active sludge energy resource rate of recovery, it is characterized in that, the method comprises:
(1) water ratio squeezed to mud mud is 75-80%;
(2) mud and the water after squeezing is mixed again in 1g/3-5ml ratio soak 2h;
(3) above-mentioned mixed solution is stirred and aeration, after 12-72h, natural subsidence is carried out to the mixed solution after stirring aeration;
(4) supernatant liquor in step (3) is entered in MAP precipitation reactor by adding magnesium salt solution and microcosmic salt solution, adjustment P/Mg/N mol ratio 1/1.2/1, under the condition stirred, reacting solution pH value 8.9 ± 0.1 is regulated with 5MNaOH, make nitrogen phosphorus in supernatant liquor that MAP precipitin reaction occur, supernatants after precipitation is entered anaerobism equalizing tank, precipitation is discharged into separating and reclaiming device and reclaims precipitation;
(5) the precipitation bed mud after natural subsidence in the supernatant liquor after MAP precipitation in step (4) and step (3) is entered anaerobism equalizing tank respectively, enter anaerobic reactor after utilizing the alkali in precipitation bed mud that mixed solution pH value is adjusted to 7.9-8.5 by mixing, fermentation methane phase reclaims the energy further.
2. a kind of clean preparation method improving the residual active sludge energy resource rate of recovery according to claim 1, it is characterized in that, the mechanical means of squeezing mud in step (1) is vacuum filter, plate-and-frame filter press, belt filter press or whizzer.
3. a kind of clean preparation method improving the residual active sludge energy resource rate of recovery according to claim 1, is characterized in that, in step (3), stir speed (S.S.) 150-400rpm, alr mode stops 5 seconds for often turning 10 seconds, and aeration rate is 3L/L min.
4. a kind of clean preparation method improving the residual active sludge energy resource rate of recovery according to claim 1, it is characterized in that, in step (3), the concentration measuring ammonia nitrogen and dissolved phosphorus in the supernatant liquor after natural subsidence reaches 420-490mg/L and 120-210mg/L respectively, supernatant liquor at 3500-6400mg/L, then is entered MAP precipitation reactor by SCOD.
5. a kind of clean preparation method improving the residual active sludge energy resource rate of recovery according to claim 1, it is characterized in that, in step (4), alr mode is after 800rpm stirs 5 minutes, reduce to 200rpm and stir 15 minutes, stop stirring postprecipitation 2-3h.
6. a kind of clean preparation method improving the residual active sludge energy resource rate of recovery according to claim 5, is characterized in that, the mass percent concentration of described magnesium salt solution is 17%, and described magnesium salt solution is MgCl
2solution, MgSO
4one in solution and MgO solution; The mass percent concentration of described microcosmic salt solution is 5%, and described microcosmic salt solution is NaH
2pO
4solution, Na
2hPO
4solution, Na
3pO
4solution, KH
2pO
4solution and K
2hPO
4one in solution.
7. a kind of clean preparation method improving the residual active sludge energy resource rate of recovery according to claim 1, it is characterized in that, in step (6), described anaerobic reactor is complete hybrid anaerobic reactor, up-flow anaerobic sludge blanket, anaerobic filter, anaerobic baffle reactor, anaerobic expanded granular sludge bed or Anaerobic Sequencing Bath Reactor.
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Cited By (4)
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| WO2018185025A1 (en) * | 2017-04-06 | 2018-10-11 | Universiteit Gent | Method for recovering n, k, and p from liquid waste stream |
| CN113896389A (en) * | 2021-11-18 | 2022-01-07 | 江苏新天鸿集团有限公司 | Method for high-pressure homogeneous anaerobic digestion of high-solid-content sludge |
| CN114768162A (en) * | 2022-05-06 | 2022-07-22 | 山东晟润建筑工程有限公司 | Multiphase foam extinguishing agent based on excess sludge protein recovery technology and preparation method and application thereof |
| CN115677069A (en) * | 2021-07-23 | 2023-02-03 | 中国石油天然气股份有限公司 | Treatment method of excess sludge |
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| CN114768162A (en) * | 2022-05-06 | 2022-07-22 | 山东晟润建筑工程有限公司 | Multiphase foam extinguishing agent based on excess sludge protein recovery technology and preparation method and application thereof |
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|---|---|
| CN105271625B (en) | 2019-07-30 |
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