CN104261644A - Method for improving efficiency of anaerobic digestion of wastewater sludge - Google Patents
Method for improving efficiency of anaerobic digestion of wastewater sludge Download PDFInfo
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- CN104261644A CN104261644A CN201410582376.8A CN201410582376A CN104261644A CN 104261644 A CN104261644 A CN 104261644A CN 201410582376 A CN201410582376 A CN 201410582376A CN 104261644 A CN104261644 A CN 104261644A
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- sludge
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- anaerobic digester
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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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for improving the efficiency of anaerobic digestion of wastewater sludge. The method comprises the following steps: (1) raw sludge generated by wastewater treatment and circulating sludge of an anaerobic digester are mixed, are heated by a heat exchanger, and enter a sludge anaerobic digester; the sludge is digested in the sludge anaerobic digester and constantly stirred in the digestive treatment process; (2) in the process of digestive treatment in the sludge anaerobic digester, the sludge enters an electrolytic cell from the lower part of the sludge anaerobic digester through an electrolytic metering pump to carry out closed electrolytic treatment, and the sludge entering the electrolytic cell every time is not larger than 10 percent of volume of the sludge anaerobic digester; (3) the electrolyzed sludge used as the circulating sludge of the anaerobic digester repeats the processes of the step (1) and the step (2) with the raw sludge, and the circulation is repeatedly carried out. The method has the advantages that compared with the digested sludge not to be electrolyzed, the solid content of the electrolyzed digested sludge is reduced by more than 30 percent, more than 30 percent of sludge quantity is reduced, and the degradation rate of organic matters anaerobically digested by sludge is increased by more than 40 percent.
Description
Technical field
The invention belongs to Recycle of Sludge in Wastewater Treatment Plant field, particularly a kind of method improving wastewater sludge anaerobic digestion efficiency.
Background technology
Domestic and international sewage work at present, particularly large-scale wastewater treatment plant, Anaerobic Digestion is adopted to make it stable as mud is last in ultimate disposal, anaerobic sludge digestion refers to that mud under anaerobic, by bacterium, the biodegradable organic substance decomposing in mud is become carbonic acid gas, methane and water etc., making mud obtain stable process, is the conventional means of a sludge reduction, stabilization.The sludge retention time long (20 1 30d) of anaerobic sludge digestion, digester volume is large, research shows to adopt ultrasonic wave, ozone, thermal treatment, the employed physico-chemical techniques such as acid-alkali treatment are combined with anaerobic digestion techniques, effectively can change and improve anaerobic digestion efficiency, but these intensifying technologys are preconditioning technique mostly, sludge treating system is not only made to add a step, and there is the defects such as the high or efficiency of energy consumption is low, constrain applying of these technology, if adopt the process of electroplating sludge in sludge digestion process, slightly do to change to original sludge anaerobic digestion system, processing efficiency can be improved, sludge quantity can also be reduced.
Electrolysis excess sludge is at electrolyzer built with pole plate, and suitable spacing got by pole plate, and anode, negative electrode are connected with rectifier anode, negative electrode respectively, after energising, under External Electrical Field, anode loses electronics generation oxidizing reaction, and negative electrode obtains electronics generation reduction reaction.Excess sludge flows through electrolyzer, as electrolytic solution, at anode and negative electrode, oxidation and reduction reaction occurs respectively.Electrolysis can become be easier to biodegradable compound, the oxidized chain rupture of polypeptide long chain molecule structural material by being difficult to biodegradable converting compounds, for biological degradation provides enough C, O, N, thus strengthens anaerobic digestion process.
Summary of the invention
To achieve these goals, the technical solution used in the present invention is:
Improve a method for wastewater sludge anaerobic digestion efficiency, comprise the steps:
(1) primary sludge that wastewater treatment produces mixes with anaerobic digester circulating sludge enter anaerobic sludge digestion pond after heat exchanger heats up, and mud carries out digestion process in anaerobic sludge digestion pond, constantly stirs in digestion process process;
(2) mud carries out in digestion process process in anaerobic sludge digestion pond, electrolyzer is entered by electrolysis volume pump from bottom, anaerobic sludge digestion pond, carry out closed electrolysis treatment, the mud at every turn entering electrolyzer is not more than the volume in 10% anaerobic sludge digestion pond;
(3) mud after electrolysis is as anaerobic digester circulating sludge and primary sludge repeating step (1) again, and the process of step (2), circulation is carried out repeatedly.
Electroplating sludge is at electrolyzer built with pole plate, and suitable spacing got by pole plate, and anode, negative electrode are connected with rectifier anode, negative electrode respectively, and after energising, under External Electrical Field, anode loses electronics generation oxidizing reaction, and negative electrode obtains electronics generation reduction reaction.Excess sludge flows through electrolyzer, as electrolytic solution, at anode and negative electrode, oxidation and reduction reaction occurs respectively.Electrolysis can become be easier to biodegradable compound, the oxidized chain rupture of polypeptide long chain molecule structural material by being difficult to biodegradable converting compounds, for biological degradation provides enough C, O, N, thus strengthens anaerobic digestion process.
Whole reaction process comprises anaerobic sludge digestion pond and Hybrid Heating system etc., the both sides at top, described anaerobic sludge digestion pond are respectively mud discharging mouth and firedamp drainage mouth, bottom, anaerobic sludge digestion pond connects Hybrid Heating system by sludge circulation pipe, described Hybrid Heating system comprises digested sludge recycle pump, primary sludge enters dredge pump, heat exchanger, the sludge circulation pipe that bottom, anaerobic sludge digestion pond picks out is connected with digested sludge recycle pump, the sludge circulation pipe that sludge circulation pump picks out with enter the mud pipe that enters that dredge pump picks out from primary sludge and be connected, get back in anaerobic sludge digestion pond through heat exchanger from the mud inlet on the top in anaerobic sludge digestion pond, in Hybrid Heating system, add electrolyzer, described electrolyzer comprises electrolysis volume pump and electrolyzer, and electrolysis volume pump is connected with Hybrid Heating system respectively by Y-tube with electrolyzer.
Further, add electrolyzer in described Hybrid Heating system, electrolyzer comprises electrolysis volume pump and electrolyzer, and electrolysis volume pump was connected with Hybrid Heating system respectively by Y-tube with electrolyzer before digested sludge recycle pump.
Further, electrolyzer is added in described Hybrid Heating system, electrolyzer comprises electrolysis volume pump and electrolyzer, electrolysis volume pump was connected with Hybrid Heating system before digested sludge recycle pump by Y-tube, and electrolyzer is connected with Hybrid Heating system after digested sludge recycle pump, before heat exchanger by Y-tube.
Further, electrolyzer is added in described Hybrid Heating system, electrolyzer comprises electrolysis volume pump and electrolyzer, electrolysis volume pump was connected with Hybrid Heating system before digested sludge recycle pump by Y-tube, and electrolyzer is connected with Hybrid Heating system after the heat exchanger by Y-tube.
Further, electrolyzer is added in described Hybrid Heating system, electrolyzer comprises electrolysis volume pump and electrolyzer, electrolysis volume pump is connected with Hybrid Heating system before entering dredge pump by Y-tube primary sludge after digested sludge recycle pump, and electrolyzer is connected with Hybrid Heating system after the heat exchanger by Y-tube.
Further, add electrolyzer in described Hybrid Heating system, electrolyzer comprises electrolysis volume pump and electrolyzer, and electrolysis volume pump is connected with Hybrid Heating system respectively by Y-tube after the heat exchanger with electrolyzer.
Use the method for said apparatus lignin-sludge, the digested sludge in the digestion process process of anaerobic sludge digestion pond carries out electrolysis by electrolyzer, and the mud at every turn entering electrolyzer is not more than the volume in 10% anaerobic sludge digestion pond.
The digested sludge solid content of electrolysis is not comparatively had to reduce by more than 30% by the digested sludge of the inventive method electrolysis, can reduce by more than 30% sludge quantity, the degradation effect of organic compound of anaerobic sludge digestion is made to improve more than 40%, greatly can improve the service efficiency of digester, thus improve the processing power more than 40% of digester.
The present invention is applicable to the sewage work of different scales, different steps, concerning construction and the working cost more than 1/3 that effectively can save sludge treatment newly-built sewage work.For reorganization and expansion sewage work, only need do a small amount of transformation on existing anaerobic sludge digestion treatment facility, the processing power of existing digester can be improved without the need to increasing digester and suite of equipment thereof, the water separation capability of sludge dewatering equipment can be improved without the need to increasing dehydration equipment, having broad application prospects.
Accompanying drawing explanation
Fig. 1 is original sludge treatment equipment
Fig. 2-Fig. 6 is various embodiment of the present invention
In figure, each sequence number is respectively
1, anaerobic sludge digestion pond 2, mud discharging mouth 3, firedamp drainage mouth 4, heat exchanger
5, primary sludge enters dredge pump 6, digested sludge 7, electrolysis volume pump 8, electrolyzer recycle pump
9, gate valve
Embodiment
Embodiment 1
Certain municipal sewage plant adopts the method process 40L mud of Fig. 1.
40L mud puts into anaerobic sludge digestion pond, and temperature controls between 30 DEG C-38 DEG C, and mud carries out anaerobic digestion reaction.Every day stirs the mud in anaerobic sludge digestion pond, leaves standstill after stirring, and leaves standstill and stirs after 8 hours again, leaves standstill and stirs after 16 hours again, and leave standstill and stir after 8 hours again, every day so operates.
Embodiment 2
Certain municipal sewage plant process 40L mud, because envrionment temperature is between 30 DEG C-38 DEG C, heat exchanger can not start, and the effect of heat exchanger is exactly keep the temperature of digestion process to carry out between 30 DEG C-38 DEG C, so the implementation case can the flow process of mimic diagram 2-Fig. 6.
40L mud puts into anaerobic sludge digestion pond, get mud 3L at the bottom of tank after stirring every day and enter electrolysis in closed cell, electrolysis turns back to after 8 hours in anaerobic sludge digestion pond to stir and leaves standstill, and leave standstill and stir after 16 hours again, get mud, electrolysis, every day so operates.
Electrolyzer volume 4L, electrode market purchasing, requires to select electric current and mounting means, electric current 2-10ma/cm according to installation guide
2.
Respectively the the the 1st, 8,13,16 day stir after from the sludge anaerobic tank of embodiment 1,2 sampling monitoring, monitoring display:
| Embodiment | Solid content % | Organic content % |
| 1 (1 day) | 4.49％ | 42.29％ |
| 1 (8 days) | 5.70％ | 38.95％ |
| 1 (13 days) | 5.49％ | 38.22％ |
| 1 (16 days) | 5.44％ | 37.50％ |
| 2 (1 days) | 4.47％ | 42.15％ |
| 2 (8 days) | 3.67％ | 40.81％ |
| 2 (13 days) | 2.88％ | 39.30％ |
| 2 (16 days) | 2.65％ | 37.97％ |
Solid content: in embodiment 1, digested sludge goes up not down.In embodiment 2, digested sludge drops to 2.65% by 4.47%, and within 16 days, solid content reduces by 40%;
Organic content: in embodiment 1 and embodiment 2, digested sludge is much the same, is all drop to about 38% from about 42%.After 16 days, to account for solids content much the same for electrolysis digested sludge and non-electrolysis digested sludge organism.
Degradation effect of organic compound:
Digested sludge in embodiment 1:
In first day every 1000g mud, solid content is the solid body of 1000*4.49%=44.9g, and wherein organic content is 44.9*42.29%=19.0g; In 16 day every 1000g mud, solid content is the solid body of 1000*5.44%=54.4g, and wherein organic content is 54.4*42.29%=20.4g.
Digested sludge in embodiment 2:
In first day every 1000g mud, solid content is the solid body of 1000*4.47%=44.7g, and wherein organic content is 44.7*42.15%=18.8g ≈ 19g; In 16 day every 1000g mud, solid content is the solid body of 1000*2.65%=26.5g, and wherein organic content is 26.5*37.97%=10.1g.
In embodiment 2 digested sludge comparatively in embodiment 1 digested sludge the 16 day degradation effect of organic compound improve (20.4-10.1)/19=54.2%.
Claims (1)
1. improve a method for wastewater sludge anaerobic digestion efficiency, it is characterized in that, comprise the steps:
(1) primary sludge that wastewater treatment produces mixes with anaerobic digester circulating sludge enter anaerobic sludge digestion pond after heat exchanger heats up, and mud carries out digestion process in anaerobic sludge digestion pond, constantly stirs in digestion process process;
(2) mud carries out in digestion process process in anaerobic sludge digestion pond, electrolyzer is entered by electrolysis volume pump from bottom, anaerobic sludge digestion pond, carry out closed electrolysis treatment, the mud at every turn entering electrolyzer is not more than the volume in 10% anaerobic sludge digestion pond;
(3) mud after electrolysis is as anaerobic digester circulating sludge and primary sludge repeating step (1) again, and the process of step (2), circulation is carried out repeatedly.
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| CN201410582376.8A CN104261644B (en) | 2014-10-27 | 2014-10-27 | A kind of method improving wastewater sludge anaerobic digestion efficiency |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174676A (en) * | 2015-09-30 | 2015-12-23 | 沈阳建筑大学 | Electro-Fenton source sludge reduction method and system based on electrochemical sludge pretreatment |
| CN108840536A (en) * | 2018-07-13 | 2018-11-20 | 上海城投污水处理有限公司 | Sludge digestion tank simulation system |
| CN112321113A (en) * | 2020-10-30 | 2021-02-05 | 上海市政工程设计研究总院（集团）有限公司 | Sludge treatment method and anaerobic digestion tank |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2577309B1 (en) * | 2016-04-12 | 2017-04-25 | Universidad De León | WASTE TREATMENT SYSTEM CONTAINING COMPLEX ORGANIC MATERIALS, USE OF THE SAME AND WASTE TREATMENT PROCESS USED BY THIS SYSTEM |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805099A (en) * | 2010-04-22 | 2010-08-18 | 长沙华时捷环保科技发展有限公司 | Treatment methods of landfill leachate and treatment systems thereof |
| CN102838262A (en) * | 2011-06-22 | 2012-12-26 | 上海市政工程设计研究总院（集团）有限公司 | Chemical enhancing pretreatment method of sludge anaerobic digestion |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805099A (en) * | 2010-04-22 | 2010-08-18 | 长沙华时捷环保科技发展有限公司 | Treatment methods of landfill leachate and treatment systems thereof |
| CN102838262A (en) * | 2011-06-22 | 2012-12-26 | 上海市政工程设计研究总院（集团）有限公司 | Chemical enhancing pretreatment method of sludge anaerobic digestion |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174676A (en) * | 2015-09-30 | 2015-12-23 | 沈阳建筑大学 | Electro-Fenton source sludge reduction method and system based on electrochemical sludge pretreatment |
| CN105174676B (en) * | 2015-09-30 | 2017-09-22 | 沈阳建筑大学 | Electric Fenton source sludge reduction method and system based on electrochemistry sludge pretreatment |
| CN108840536A (en) * | 2018-07-13 | 2018-11-20 | 上海城投污水处理有限公司 | Sludge digestion tank simulation system |
| CN112321113A (en) * | 2020-10-30 | 2021-02-05 | 上海市政工程设计研究总院（集团）有限公司 | Sludge treatment method and anaerobic digestion tank |
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Effective date of registration: 20170203 Address after: 300191 Tianjin City, Nankai District Ying channel No. 2 Tian garden 4-2-701 Patentee after: Li Rong Address before: 300000 Tianjin City, Hexi District Liberation Road and Shaoxing road junction northeast side of Haiway Mingdi 1.2-102 Patentee before: TIANJIN QIANRUN ENVIRONMENTAL ENGINEERING CONSULTING CO., LTD. |
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Granted publication date: 20160330 Termination date: 20201027 |
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