CN104803546B - Technology for reducing and recycling treatment of sludge of sewage treatment plant - Google Patents

Technology for reducing and recycling treatment of sludge of sewage treatment plant Download PDF

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Publication number
CN104803546B
CN104803546B CN201510132351.2A CN201510132351A CN104803546B CN 104803546 B CN104803546 B CN 104803546B CN 201510132351 A CN201510132351 A CN 201510132351A CN 104803546 B CN104803546 B CN 104803546B
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sludge
sewage
treatment
biogas
primary
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CN201510132351.2A
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CN104803546A (en
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周艳伟
谢乔光
易莹
孔伟
张堃
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中国电器科学研究院有限公司
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Abstract

A technology for reducing and recycling treatment of sludge of a sewage treatment plant comprises steps as follows: sewage is treated with an air-floatation method, pretreated sewage and primary sludge are produced, the pretreated sewage is drained after biochemical treatment, treatment by a secondary sedimentation tank and disinfection treatment, excess sludge is separated in the secondary sedimentation tank, the primary sludge and the excess sludge are concentrated, and concentrated sludge and a supernate are separated out; the concentrated sludge has an anaerobic digestion reaction, digested sludge is subjected to incineration or landfill treatment after dehydration and drying treatment, a filtrate is produced during dehydration of the digested sludge, and biogas is subjected to power generation and/or heat recovery treatment after dehydration and desulfurization treatment; the supernate and the filtrate are mixed for nitrogen and phosphorus removal. With the adoption of the technology, the primary sedimentation effect of the sewage is improved, the yield of the primary sludge is increased, the primary sludge is removed before biochemical treatment, the yield of the excess sludge is decreased from the source, the primary sludge and the excess sludge are subjected to anaerobic digestion treatment, the higher organic matter transformation rate and the higher biogas yield can be obtained, and the sludge can be reduced and recycled.

Description

A kind of sludge of sewage treatment plant minimizing, recycling treatment process
Technical field
The invention belongs to sewage treatment technology field is and in particular to a kind of sludge of sewage treatment plant minimizing, resource Change handling process.
Background technology
Sewage treatment plant residual mud is the by-product in sewage disposal process, general 50% pollutant transfer in sewage Arrive in mud.If process that sludge of sewage treatment plant cannot be appropriate in time is disposed, directly outward transport, directly agricultural or any Stack and nonstandard landfill, pollutant may enter soil, surface water body and ground water regime and cause secondary pollution, thus Have a strong impact on the actual effect of water pollution control.Therefore appropriate process and disposal must be carried out to mud, accomplish innoxious, steady Fixedization, minimizing.
Locate after the sewage treatment plant sludge harmless that is generally used at present, stabilisation, minimizing handling process route Based on reason, the mud producing in the end of sewage treatment process is to sewage disposal process is processed, main process skill Art includes the anaerobic digestion of mud, drying and incineration etc., and sludge ultimate disposal technology is filled up and utilized with building materials.Dirt common at present Water treatment plant's sludge dispoal disposing technique route is as shown in fig. 1.Wherein anaerobic sludge digestion technology both can reach mud Innoxious, stabilisation, the processing intent of minimizing, can reclaim the biomass energy in mud in the form of biogas simultaneously, thus Realize the recycling treatment of mud, and processing procedure energy consumption low (with respect to Aerobic Process for Treatment), almost there is no secondary pollution, because This, the most economical effective sludge disposal technology that anaerobic digestion is well recognized as.This technology has obtained commonly used, in China in America and Europe Application is less.
Sludge of sewage treatment plant is based on excess sludge (biochemical sludge that Biochemical method sewage produces), first for being provided with The sewage treatment plant in heavy pond, also include primary sludge (mud that preliminary sedimentation tank produces).Primary sludge is solid by the suspension in sewage Body particulate matter and partial solubility organic pollution composition, its prime cost is animals and plants organism remains.In excess sludge Based on microbial cell, the stability of microbial cell structure determines it and is difficult to biodegradation biomass.With excess sludge Compare, the primary sludge content of organic matter is higher, the content of primary sludge volatile organic is 60 ~ 70%, and excess sludge only has 50% about, simultaneously primary sludge be easier biodegradation compared with excess sludge, the organic matter transformation rate of primary sludge anaerobic digestion is high In 50%, the organic biogas yield of unit is 900ml/gvsre, and the organic matter transformation rate of excess sludge anaerobic digestion is general For 30%, biogas yield is 400 ~ 500 ml/gvsre.
Therefore, anaerobic sludge digestion processes the organic conversion ratio of presence and biogas yield is relatively low, or sludge retention time is relatively Length leads to process allocation scale larger, invests the difficult problem such as higher, comes for the relatively low practical situation of China's mud content of organic matter Say, these problems are more prominent.This largely have impact on the promotion and application in China for the anaerobic sludge digestion technology.
Content of the invention
It is an object of the invention to provide a kind of sludge of sewage treatment plant minimizing, recycling treatment process, this technique is led to Cross the first heavy effect of enhanced sewage, improve the yield of primary sludge, primary sludge is entered and removes before biochemical treatment unit, from The yield of excess sludge is decreased on source, primary sludge and excess sludge are carried out Anaerobic Digestion, can obtain higher Organic matter transformation rate and biogas yield, and enable minimizing and the resource of mud.
The above-mentioned purpose of the present invention is achieved through the following technical solutions: a kind of sludge of sewage treatment plant minimizing, Recycling treatment process, comprises the following steps:
(1) sewage treatment plant's sewage is carried out after pretreatment, adopt at method of pressed dissolved-air release in the presence of flocculant Reason, produces pretreating sewage and primary sludge, by pretreating sewage row up to standard through biochemical treatment, second pond and after disinfecting Put, separating in second pond has excess sludge, primary sludge and excess sludge is mixed to form mixing sludge, mixing sludge is entered Row concentration, isolates thickened sludge and supernatant;
(2) thickened sludge is carried out mesophilic anaerobic digestion reaction, produces digested sludge and biogas, digested sludge through dehydration, Burn or landfill disposal after drying and other treatment, during digested sludge dehydration, have filtrate, biogas, after eliminating water desulfurization process, carries out sending out Electricity and/or recuperation of heat are processed;
(3) filtrate in the supernatant in step (1) and step (2) is mixed, using guanite sedimentation method denitrogenation dephosphorizing, The pretreatment to step (1) for the effluent recycling after denitrogenation dephosphorizing, is then continued with using identical subsequent step with sewage.
In above-mentioned sludge of sewage treatment plant minimizing, recycling treatment process:
Pretreatment described in step (1) preferably includes to process sewage through coarse rack, fine fack and aerated grit chamber.
Flocculant described in step (1) is preferably pam flocculant, and its addition is 1 ~ 2mg/l.
After adopting dissolved air flotation process in step (1) in the presence of flocculant, can be except 50 ~ 70% hang in decontaminated water Floating particles thing.
The sewage of sewage treatment plant is entered through the pre- place such as coarse rack, fine fack and aerated grit chamber in step (1) of the present invention After reason, then process through dissolved air flotation, in the case of adding flocculant, most of suspended particulate substance (ss) and portion in sewage Divide dissolved organic matter to be removed, formed " primary sludge ";Result of the test shows, in the process, 50% ~ 70% particle Thing (ss) is removed.Due to Bubble-floating Method eliminate in sewage 50% ~ 70% suspended particulate substance (ss) and partial solubility organic Thing, therefore, the surplus sludge volume that now biochemical wastewater treatment produces will be considerably less than without excess sludge during air-flotation process Yield, meanwhile, the energy consumption of biochemical treatment (aerobic treatment) about also will significantly reduce;It is estimated that, this process can reduce 30 ~ 40% excess sludge productions, reduce by 30 ~ 40% aeration energy consumption.
Pass through high-efficiency dissolued-air Bubble-floating Method enhanced sewage in step (1) of the present invention and process just heavy effect, realize surplus from source The purpose of remaining mud decrement.Improve the yield of primary sludge, be that subsequent anaerobic digestion process has retained more organic substrates, especially It is the higher fat of biogas output, the concentration of fatty acid type organic substrates, so that anaerobic digester system acquisition is higher Organic substrates conversion ratio and biogas yield, thus decreasing the construction cost of sludge anaerobic digestion system, improving sludge anaerobic and disappearing The economy of change system.Additionally, sewage had retained majority of organic pollutants before entering aerobic treatment, reduce dirt The aeration energy consumption of water aerobic treatment.
In addition, air supporting can reduce the quantity of sand and mud in " primary sludge ", the silt that enters anaerobic digestion reaction vessel is greatly decreased Amount, is that steady in a long-term operation of anaerobic digestion reaction vessel creates good conditions.
In step (1) by mixing sludge carry out concentration to mixing sludge moisture content be 92 ~ 94%.
The primary sludge that in step (1) of the present invention, Bubble-floating Method produces and the excess sludge of second pond generation are formed after mixing Mixing sludge, mixing sludge is concentrated into after moisture content 92 ~ 94%, carries out Anaerobic Digestion.Here Anaerobic Digestion reaction Device can be full mixed anaerobic digestion reactor (cstr).
The remaining digested sludge of anaerobic digestion is sent into device for dehydrating sladge waste and is carried out processed.Dewatered sludge is sent into mud and is done Gasifying device carries out drying and other treatment.
When thickened sludge being carried out mesophilic anaerobic digestion reaction in step (2), reaction temperature is 33 ~ 37 DEG C, and ph value is 7.0 ~7.8.
In step (2), the biogas energy producing that carries out generating electricity includes for digested sludge drying and other treatment, and recuperation of heat processes bag Include the heat that biogas is produced and be used for digested sludge drying and other treatment.
The biogas that mixing sludge anaerobic digestion produces, after the process of eliminating water desulfurizing and purifying, can be generated electricity and/or heat is returned Receipts are processed, and when generating is processed, can be passed through in biogas cogeneration units, the electric energy of generation is connected to the grid, and the waste heat of recovery is made Thermal source for sludge drying is conveyed to mud drying device, or is passed directly into methane boiler, produces thermal source, for sludge drying. The dewatered sludge finally being obtained can be delivered to garbage burning factory and carry out burning disposal or be transported to refuse landfill and carry out landfill stabilization.
The present invention carries out drying and other treatment for the energy to digested sludge with the biogas that anaerobic sludge digestion produces, it is possible to achieve dirty The maximization of mud decrement, because present invention process can obtain more biogas than traditional residual anaerobic sludge digestion technique, because This is not in the case of additionally supplementing the energy, it is possible to obtain preferably sludge drying effect.
The guanite producing after adopting guanite sedimentation method denitrogenation dephosphorizing in step (3) is stand-by as slow-release fertilizer.
In step (1), mixing sludge concentrates digested sludge dehydration in the supernatant producing and step (2) and produces filtrate mixing Adopt guanite sedimentation method denitrogenation dephosphorizing, the nh in this supernatant and filtrate afterwards4+、po4 3-Mgo or mgcl adding with outside2Deng Magnesium source generates mg nh4po4•6h2O crystallizes (guanite, slow-release fertilizer), and is removed from above-mentioned sewage by the sedimentation method;Bird The effluent recycling of gastrolith sedimentation method denitrification dephosphorization apparatus is to sewage treatment plant's preprocessing system.
Main purpose using guanite sedimentation method denitrogenation dephosphorizing is, because sewage is before entering aerobic treatment, A considerable amount of organic pollutions in sewage are eliminated by dissolved air flotation, and by wherein most in anaerobic digestion reaction Organic pollution is converted into biogas, finally with thickened sludge supernatant and digested sludge dehydration filtrate backflow organic pollution only Account for a little part, result of the test shows that said process eliminates in sewage 30 ~ 40% cod, and this process is to nh4+、po4 3-'s Clearance is very limited, therefore, if it is de- that thickened sludge supernatant and digested sludge dehydration filtrate are not carried out with effectively chemistry Nitrogen dephosphorization is processed, and may result in the process of saprobia method denitrogenation dephosphorizing can not be up to standard because carbon source is not enough.
The present invention has the advantage that
(1) present invention passes through the first heavy treatment effect that effective dissolved air flotation treatment technology enhanced sewage is processed, and improves The yield of primary sludge, by the physical removal effectively of some organic pollutants in sewage before sewage enters biochemical treatment, The aeration energy consumption of biochemical wastewater treatment (aerobic) so can be saved, effectively can reduce in source remaining in sewage disposal process again The yield of mud;
(2) present invention passes through dissolved air flotation to sewage turnover just heavy process, can reduce the quantity of sand and mud in " primary sludge ", The quantity of sand and mud that enter anaerobic digestion reaction vessel is greatly decreased, is that steady in a long-term operation of anaerobic digestion reaction vessel creates good conditions;
(3) present invention is carried out at anaerobic digestion by the primary sludge producing and excess sludge after dissolved air flotation is processed Reason, because the first heavy process of strengthening decreases the amount of the organic pollution entering aerobic treatment process, and increased entrance Anaerobic sludge digestion processes the amount of primary sludge, thus compared with traditional excess sludge Anaerobic Digestion process route, this Invented technology route can obtain higher organic matter transformation rate and biogas yield, it is possible to achieve preferably sludge reduction and money Source treatment effect;
(4) present invention carries out drying and other treatment, Ke Yishi for the energy to digested sludge with the biogas that anaerobic sludge digestion produces The maximization of existing mud decrement, because present invention process can obtain more natural ponds than traditional residual anaerobic sludge digestion technique Gas, therefore in the case of additionally not supplementing the energy, it is possible to obtain preferably sludge drying effect;
(5) technique of the present invention is also combined with sludge drying treatment technology, the biogas being produced using anaerobic sludge digestion For the energy, drying and other treatment is carried out to final digested sludge, can farthest realize sludge reduction treatment effect, and energy Greatly reduce transport and the cost of disposal of sludge ultimate disposal.
Brief description
Fig. 1 is sludge of sewage treatment plant aftertreatment technology route common at present;
Fig. 2 is sludge of sewage treatment plant minimizing in the embodiment of the present invention 1, recycling treatment process block diagram.
Specific embodiment
Embodiment 1
As shown in Figure 2, the sludge of sewage treatment plant minimizing of present invention offer, recycling treatment process, including following Step:
(1) enter the sewage of sewage treatment plant after the pretreatment such as coarse rack, fine fack and aerated grit chamber, enter rectangle Efficient Pressurized dissolved gas flotation device, in the case of adding pam flocculant (dosage 1mg/l), most of in sewage suspend Particulate matter (ss) and partial solubility Organic substance are removed, and are formed " primary sludge ";Result of the test shows, in the process, 50% ~ 70% suspended particulate substance (ss) is removed, and the sewage after processing through high-efficiency dissolued-air air-floating apparatus is respectively through biochemical treatment list First (aerobic, a2O method), second pond and disinfect rear qualified discharge, due to air flotation cell eliminate in sewage 50% ~ 70% outstanding Floating particles thing (ss) and partial solubility Organic substance, therefore, the surplus sludge volume that now biochemical wastewater treatment unit produces will Can be considerably less than without excess sludge yield during air-flotation process, meanwhile, the energy consumption of aerobic treatment unit about also will Significantly reduce;It is estimated that, this process can reduce by 30 ~ 40% excess sludge productions, reduces by 30 ~ 40% aeration energy consumption.
(2) air-floating apparatus produce " primary sludge " and the excess sludge of second pond generation enter sludge concentration tank respectively, After mixing sludge is concentrated into moisture content 92% about, pumps into anaerobic digestion reaction vessel and carry out Anaerobic Digestion.Here anaerobic digestion Reactor is full mixed anaerobic digestion reactor (cstr).The remaining digested sludge of anaerobic digestion is sent into device for dehydrating sladge waste and is carried out Processed.Dewatered sludge is sent into mud drying device and is carried out drying and other treatment.The biogas that mixing sludge anaerobic digestion produces is through removing Water desulfurizing and purifying is processed to be used, and is passed through biogas cogeneration units, the electric energy of generation is connected to the grid, and the waste heat of recovery is done as mud The thermal source changed is conveyed to mud drying device, and the dewatered sludge finally being obtained can be delivered to garbage burning factory and carry out burning disposal.
(3) supernatant that sludge concentration tank produces and digested sludge dehydration produce the entrance guanite sedimentation method after filtrate mixing Denitrification dephosphorization apparatus, the nh in above-mentioned combined sewage4 +、po4 3-Mgo or mgcl adding with outside2Generate mg in magnesium source nh4po4·6h2O crystallizes (guanite, slow-release fertilizer), and is removed from above-mentioned sewage by the sedimentation method;The guanite sedimentation method The effluent recycling of denitrification dephosphorization apparatus is to sewage treatment plant's pretreatment system.The main purpose of this process is, due in the present invention In, sewage, before entering aerobic treatment unit, has been eliminated a considerable amount of in sewage by high-efficiency dissolued-air air-floating apparatus Organic pollution, and it is converted into biogas in anaerobic digestion reaction vessel just wherein most, finally with concentration basin supernatant and dirt The organic pollution of mud dehydration filtrate backflow only accounts for a little part, result of the test show said process eliminate 30 in sewage ~ 40% cod, and this process is to nh4 +、po4 3-Clearance very limited, therefore, if do not taken off to concentration basin supernatant and mud Filter liquor carries out effectively chemical denitrogenation dephosphorizing and processes, and may result in saprobia method denitrogenation dephosphorizing and processes because carbon source is not enough Can not be up to standard.
Embodiment 2
As shown in Figure 2, the sludge of sewage treatment plant minimizing of present invention offer, recycling treatment process, including following Step:
(1) enter the sewage of sewage treatment plant after the pretreatment such as coarse rack, fine fack and aerated grit chamber, enter shallow-layer High-efficiency dissolued-air air-floating apparatus, in the case of adding pam flocculant (dosage 2mg/l), most of suspended particulate substance in sewage (ss) and partial solubility Organic substance is removed, form " primary sludge ";Result of the test shows, in the process, 50% ~ 70% Suspended particulate substance (ss) be removed, through high-efficiency dissolued-air air-floating apparatus process after sewage respectively through biochemical treatment unit (aerobic, Cass method), second pond and disinfect rear qualified discharge, because air flotation cell eliminates in sewage 50% ~ 70% particle Thing (ss) and partial solubility Organic substance, therefore, the surplus sludge volume that now biochemical wastewater treatment unit produces will be significantly Less than without excess sludge yield during air-flotation process, meanwhile, the energy consumption of aerobic treatment unit about also will significantly drop Low;It is estimated that, this process can reduce by 30 ~ 40% excess sludge productions, reduces by 30 ~ 40% aeration energy consumption.
(2) air-floating apparatus produce " primary sludge " and the excess sludge of second pond generation enter sludge concentration tank respectively, After mixing sludge is concentrated into moisture content 94% about, pumps into anaerobic digestion reaction vessel and carry out Anaerobic Digestion.Here anaerobic digestion Reactor is full mixed anaerobic digestion reactor (cstr).The remaining digested sludge of anaerobic digestion is sent into device for dehydrating sladge waste and is carried out Processed.Dewatered sludge is sent into mud drying device and is carried out drying and other treatment.The biogas that mixing sludge anaerobic digestion produces is through removing Water desulfurizing and purifying is processed to be used, and is passed through biogas cogeneration units, the electric energy of generation is connected to the grid, and the waste heat of recovery is done as mud The thermal source changed is conveyed to mud drying device, and the dewatered sludge finally being obtained can be delivered to garbage burning factory and carry out burning disposal.
(3) supernatant that sludge concentration tank produces and digested sludge dehydration produce the entrance guanite sedimentation method after filtrate mixing Denitrification dephosphorization apparatus, the nh in above-mentioned combined sewage4 +、po4 3-Mgo or mgcl adding with outside2Generate mg in magnesium source nh4po4·6h2O crystallizes (guanite, slow-release fertilizer), and is removed from above-mentioned sewage by the sedimentation method;The guanite sedimentation method The effluent recycling of denitrification dephosphorization apparatus is to sewage treatment plant's pretreatment system.The main purpose of this process is, due in the present invention In, sewage, before entering aerobic treatment unit, has been eliminated a considerable amount of in sewage by high-efficiency dissolued-air air-floating apparatus Organic pollution, and it is converted into biogas in anaerobic digestion reaction vessel just wherein most, finally with concentration basin supernatant and dirt The organic pollution of mud dehydration filtrate backflow only accounts for a little part, result of the test show said process eliminate 30 in sewage ~ 40% cod, and this process is to nh4 +、po4 3-Clearance very limited, therefore, if do not taken off to concentration basin supernatant and mud Filter liquor carries out effectively chemical denitrogenation dephosphorizing and processes, and may result in saprobia method denitrogenation dephosphorizing and processes because carbon source is not enough Can not be up to standard.
Embodiment 3
As different from Example 1, in step (2) mixing sludge anaerobic digestion produce biogas through eliminating water desulfurizing and purifying at After reason, it is passed directly into methane boiler, produce thermal source, for sludge drying.The dewatered sludge finally being obtained is transported to garbage loading embeading Field carries out landfill stabilization.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not subject to above-described embodiment Limit.Other any spirit without departing from the present invention and the change made under principle, modification, replacement, combine, simplify, All should be equivalent substitute mode, be included in protection scope of the present invention.

Claims (6)

1. a kind of sludge of sewage treatment plant minimizing, recycling treatment process, is characterized in that comprising the following steps:
(1) sewage treatment plant's sewage is carried out after pretreatment, adopt method of pressed dissolved-air release to process in the presence of flocculant, produce Raw pretreating sewage and primary sludge, by pretreating sewage qualified discharge through biochemical treatment, second pond and after disinfecting, two Separating in heavy pond has excess sludge, primary sludge and excess sludge is mixed to form mixing sludge, mixing sludge is concentrated Process, isolate thickened sludge and supernatant;
(2) thickened sludge is carried out mesophilic anaerobic digestion reaction, produce digested sludge and biogas, digested sludge is through dehydration, mummification Burn or landfill disposal after process, have filtrate during digested sludge dehydration, biogas, after eliminating water desulfurization process, is generated electricity And/or recuperation of heat is processed;
(3) filtrate in the supernatant in step (1) and step (2) is mixed, using guanite sedimentation method denitrogenation dephosphorizing, denitrogenation The pretreatment to step (1) for the effluent recycling after dephosphorization, is then continued with using identical subsequent step with sewage;
Flocculant described in step (1) is pam flocculant, and its addition is 1 ~ 2mg/l;
After adopting method of pressed dissolved-air release process in step (1) in the presence of flocculant, can be except 50 ~ 70% hang in decontaminated water Floating particles thing.
2. sludge of sewage treatment plant minimizing according to claim 1, recycling treatment process, is characterized in that: step (1) Described in pretreatment include by sewage through coarse rack, fine fack and aerated grit chamber process.
3. sludge of sewage treatment plant minimizing according to claim 1, recycling treatment process, is characterized in that: step (1) Middle by mixing sludge carry out concentration to mixing sludge moisture content be 92 ~ 94%.
4. sludge of sewage treatment plant minimizing according to claim 1, recycling treatment process, is characterized in that: step (2) Middle by thickened sludge carry out mesophilic anaerobic digestion reaction when, reaction temperature be 33 ~ 37 DEG C, ph value is 7.0 ~ 7.8.
5. sludge of sewage treatment plant minimizing according to claim 1, recycling treatment process, is characterized in that: step (2) The energy that middle biogas carries out generating generation includes for digested sludge drying and other treatment, and recuperation of heat processes the heat including producing biogas Measure for digested sludge drying and other treatment.
6. sludge of sewage treatment plant minimizing according to claim 1, recycling treatment process, is characterized in that: step (3) The guanite producing after middle employing guanite sedimentation method denitrogenation dephosphorizing is stand-by as slow-release fertilizer.
CN201510132351.2A 2015-03-25 2015-03-25 Technology for reducing and recycling treatment of sludge of sewage treatment plant CN104803546B (en)

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CN105399293B (en) * 2015-12-29 2018-03-27 北京桑德环境工程有限公司 A kind of sludge drying treatment system
CN105776751A (en) * 2016-04-13 2016-07-20 太原理工大学 Process for efficient separation of organic carbon source in sewage and energy development and utilization
CN106630388B (en) * 2016-11-24 2020-05-22 天津市环境保护科学研究院 Integral energy-saving method for sewage treatment of industrial park
CN107043199B (en) * 2017-05-05 2020-07-17 河南恒安环保科技有限公司 Hospital wastewater treatment and resource recovery method
CN108218182A (en) * 2018-03-05 2018-06-29 北京环球中科水务科技有限公司 The dewatering of anaerobically digested sludge
CN108840541A (en) * 2018-06-23 2018-11-20 安徽拓谷物联科技有限公司 Bio protease is reduced the treatment process reacted with bed mud
CN109160630A (en) * 2018-09-04 2019-01-08 南京师范大学 It is a kind of to precipitate the phosphorus in waste water recovery process for combining alkaline anaerobic fermentation based on chemical strengthening level-one
CN109293187A (en) * 2018-10-29 2019-02-01 重庆市沃利克环保设备有限公司 A kind of processing method for the sludge that sewage treatment generates

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