CN102515453B - High-concentration anaerobic digestion treating device for urban sludge and use method - Google Patents
High-concentration anaerobic digestion treating device for urban sludge and use method Download PDFInfo
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- CN102515453B CN102515453B CN2011103754276A CN201110375427A CN102515453B CN 102515453 B CN102515453 B CN 102515453B CN 2011103754276 A CN2011103754276 A CN 2011103754276A CN 201110375427 A CN201110375427 A CN 201110375427A CN 102515453 B CN102515453 B CN 102515453B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention relates to environmental protection and specifically relates to a high-concentration anaerobic digestion treating device for urban sludge and a use method. The treating device comprises an anaerobic digestion unit, an anoxic digestion unit and a ferric oxide filtering unit, wherein a fixed type separating dispersing layer is arranged in a shell of the treating device; the interior of the shell is separated into the anaerobic digestion unit and the anoxic digestion unit by the fixed type separating dispersing layer; anode and cathode electrodes are respectively arranged in the anaerobic digestion unit and the anoxic digestion unit and are separated by the fixed type separating dispersing layer; an anion-cation exchange resin mixing column is arranged in the anaerobic digestion unit; a sludge inlet and a sludge outlet are respectively formed on two side walls of the anaerobic digestion unit; a water inlet and a water outlet are respectively formed on the two side walls of the anoxic digestion unit; and the water outlet is connected with the ferric oxide filtering unit 3 and a draining port in turn. The treating device provided by the invention is used for reducing the harmful influence of the accumulation of acidy metabolic products during the anaerobic digestion process of the urban sludge on the activity of related microorganism floras. The treating device provided by the invention is suitable for the high-concentration anaerobic digestion of the sludge.
Description
Technical field
The present invention relates to environment protection, specifically a kind for the treatment of unit of municipal sludge high-concentration anaerobic digestion and using method.
Background technology
China's municipal sewage treatment amount improves year by year, and the mud that produces in the sewage treatment process also increases synchronously.The sewage treatment capacity of China reaches 1.36 hundred million ton per days at present, and treatment rate of domestic sewage surpasses 70%.Produce 0.3-0.5% mud in the sewage treatment process, the general 99-96% of water content, the generation of national dewatered sludge (moisture 80%) are above 2,500 ten thousand ton/years.
Municipal sludge is without stabilization treatment, arbitrarily landfill, topple over and be used for the farmland use and all may cause environmental pollution.The up-to-date relevant regulations of issuing in 2009 has clearly defined the party responsible that sewage work is the mud safe disposal, is responsible for disposing voluntarily or entrusting relevant speciality company to dispose the mud that produces.Sewage sludge harmlessness and stabilization are the minimum requirements of mud safe disposal, and for fear of soil, underground water and atmospheric pollution that the simple landfill of municipal sludge causes, that municipal sludge is needed badly is innoxious, stabilization, resource utilization and minimizing are disposed.
Sludge disposal mainly contains three core links: mud is concentrated, mud organic substance is disposed and the sludge heavy-metal pollutant is disposed.In the concentrated link of mud, digestion or undigested mud general first mechanically dehydration then according to the concrete disposal method of mud, may utilize the methods such as sun power, industrial exhaust heat or lime further dehydration and mummification to moisture about 80%.Mud organic substance is disposed in the link, mainly realizes stable, decrement and the recycling of mud organic substance by three approach (burning, aid burning or bio-digestion).Heavy metal in the Direct Disposal mud is difficult for, generally by organic passivation or the curing that indirectly realizes sludge heavy-metal of disposing sludge.Can say, safety, reasonably the organism in the disposing sludge is the key of safe disposal mud.
Based on above three sludge disposal links, formed diversified sludge disposal scheme: 1) dewatered sludge is good mud by the waste heat mummification of coal-fired flue-gas or manufacture of cement and for burning, brickmaking, production cement etc., but be only suitable for minority sewage work, the sewage work in many cities has an area of tens kilometers does not have cement mill or heat power plant yet; 2) if sludge heavy-metal content does not exceed standard, the aerobic compost processing is the good method of another disposing sludge for the production of fertilizer after the sludge dewatering, but the ozone Control in the composting process is extremely important; 3) mud or dewatered sludge anaerobic digestion had both been realized sludge reduction and stabilization, can obtain again biogas and be used for generating or heat supply, if the mud heavy metal content after the digestion process does not exceed standard, can be used for gardening plantation and agriculture production.
Because the industrial production layout is uneven, heavy metal class in the mud that the many municipal sewage plants of China produce is polluted relatively light, in the safe disposal scheme of this class mud, be fit to very much incorporate anaerobic sludge digestion and process this recycling sludge and minimizing disposal link.But, anaerobic sludge digestion has certain strict demand, and the realization steady running also is not easy.This is because in the anaerobic sludge digestion process, the accumulation of organic acid, hydrogen sulfide or toxic heavy metal all can suppress the activity that methane produces bacterium, causes whole anaerobic digester system processing efficiency low and even routed.Therefore, stablizing the physiological environment of methanogen in anaerobic digestion process, is the key of stablizing anaerobic digestion.
Summary of the invention
The object of the invention is to provide a kind of device and method of municipal sludge high-concentration anaerobic digestion.
For achieving the above object, the scheme of the present invention's employing is:
A kind for the treatment of unit of municipal sludge high-concentration anaerobic digestion, comprise anaerobic digestion unit, anoxic digestion unit and ferric oxide filtering unit, the enclosure interior of described treatment unit is provided with fixed separation diffusion layer, this fixed separation diffusion layer is divided into anaerobic digestion unit and anoxic digestion unit with enclosure interior, and positive and negative electrode divides and is in anaerobic digestion unit and the anoxic digestion unit, separates by fixed separation diffusion layer; Be provided with anion-cation exchange resin in the anaerobic digestion unit and load in mixture post, be respectively equipped with mud admission port, mud relief outlet in the two side of anaerobic digestion unit; Water-in and water outlet are located at respectively the two side of anoxic digestion unit, and described water outlet connects ferric oxide filtering unit and water port successively.
Described positive and negative electrode links to each other with the external source low-voltage dc power supply.The voltage of described external source low-voltage dc power supply is 0.4-1.0V.Described anoxic digestion top, unit is provided with venting port.The volume ratio of described anaerobic digestion unit and anoxic digestion unit is 5: 1-10: 1.Described anion-cation exchange resin loads in mixture post and is positioned at anaerobic digestion unit bottom central authorities, and anion-cation exchange resin loads in mixture the 1-5% that post accounts for the anaerobic digestion unit volume.Described anion-cation exchange resin loads in mixture the mass ratio 3 of the anion-cation exchange resin in the post: 1-1: 3.Described mud admission port and mud relief outlet lay respectively at the both sides of anaerobic digestion unit axial cross section, and the mud relief outlet is higher than the mud admission port.Described mud relief outlet and water outlet are positioned at homonymy.
The using method of the treatment unit of municipal sludge high-concentration anaerobic digestion, in the anaerobic digestion unit, add pending mud, utilize in the anaerobic digestion unit anion-cation exchange resin to load in mixture and add recycled anion-cation exchange resin in the post, be aided with anoxic digestion unit, and between anaerobic digestion unit and anoxic digestion unit, apply low-voltage dc voltage, the inner acidic meta-bolites accumulation of reduction anaerobic digestion unit, the system stability of raising municipal sludge high-concentration anaerobic digestion.
Describedly between anaerobic digestion unit and anoxic digestion unit, separate with fixed separation diffusion layer; Fill the quartz sand of particle diameter 5-10mm in the diffusion layer.PH in the described anoxic digestion unit is controlled between the 5-10 by adding nitric acid.
The mud that the anaerobic digestion unit by using is added within it carries out Anaerobic Digestion, the cultivation of anaerobic digestion unit the unloading phase carrying out needing to experience one before the anaerobic sludge digestion.The unloading phase, (32-35 ℃) drops into the fresh sludge of moisture 98-99.0% (mass ratio) in the anaerobic digestion district under the medium temperature condition, and the mixed solution that consists of of the butyric acid that adds the propionic acid of the starch contain 0.5-2.0% (mass ratio), 1-10mM and 1-10mM, cultivate a week; Then weekly in the ratio of anaerobic digestion unit volume 20-80%, replace with the above-mentioned mixed solution of fresh configuration, continued for three weeks.Meanwhile, carry out anoxic digestion unit the unloading phase cultivation.In anoxic digestion unit, add the fresh sludge of 0.1-0.2% (mass ratio), add SODIUMNITRATE and the 1-5mM sodium sulphite of 1-5mM, cultivate a week; Then every circumferentially anoxic digests the nitric acid that adds 2-5mM in the unit, continues for three weeks.
Sludge treatment: under the medium temperature condition (32-35 ℃), pending mud enters the anaerobic digestion unit by the mud admission port 8 of anaerobic digestion unit.The weekly input amount of the mud of moisture 95-85% is the 1/3-1/8 of anaerobic digestion unit volume, the withdrawal volume of mud accounts for the 60-90% that mud drops into volume, rest part is with liquid form, continuously lentamente through behind the anoxic digestion unit 2, water outlet 11 through anoxic digestion unit 2, enter ferric oxide filtering unit 3, then discharge by relief outlet 13.The pH of anoxic digestion unit maintains between the 5-10 by adding nitric acid.Impressed voltage 0.4-1.0V between anaerobic digestion unit 1 and the anoxic digestion unit 2, and with anion-cation exchange resin, improve the stability that methane produces the bacterium suitable habitats.The gas that anaerobic digestion unit and anoxic digestion unit produce is collected by venting port 12.The water outlet of anoxic digestion unit is after ferric oxide filters, as liquid nitrogen fertilizer; Discharge mud and be used for organic fertilizer production.The gas that produces in the anaerobic digestion unit enters anoxic digestion unit by separating diffusion layer, and discharges by the venting port of anoxic digestion unit.
The present invention has advantages of:
1. the acidic metabolite accumulation is fit to the high-concentration anaerobic digestion of mud to the disadvantageous effect of related microorganisms bacterial activity in the reduction urban mud anaerobic digestion process.
2. reduce the odor pollution in the anaerobic sludge digestion process.
3. obtain biogas and fertilizer, realize the recycling of mud.
Description of drawings
Fig. 1 is the treatment unit of anaerobic sludge digestion of the present invention.
Embodiment
As shown in Figure 1, treatment unit, comprise anaerobic digestion unit 1, anoxic digestion unit 2 and ferric oxide filtering unit 3, the enclosure interior of described treatment unit is provided with fixed separation diffusion layer 5, this fixed separation diffusion layer 5 is divided into anaerobic digestion unit 1 and anoxic digestion unit 2 with enclosure interior, positive and negative electrode was in anaerobic digestion unit 1 and the anoxic digestion unit 2 in 6 minutes, separates by fixed separation diffusion layer 5, and positive and negative electrode 6 links to each other with external source low-voltage dc power supply 7 simultaneously; Be provided with anion-cation exchange resin in the anaerobic digestion unit 1 and load in mixture post 4, be respectively equipped with mud admission port 8, mud relief outlet 9 in the two side of anaerobic digestion unit 1; Water-in 10 and water outlet 11 are located at respectively the two side of anoxic digestion unit 2, and described water outlet 11 connects ferric oxide filtering unit 3 and water port 13 successively, and venting port 12 is located at anoxic digestion 2 tops, unit in addition.Described mud admission port 8 and mud relief outlet 9 lay respectively at the both sides of anaerobic digestion unit 1 axial cross section, and mud relief outlet 9 is higher than mud admission port 8.Described mud relief outlet 9 is positioned at homonymy with water outlet 11.
Described anaerobic digestion unit and anoxic digestion unit are made of cylindrical synthetic glass, and internal diameter is 20cm, high respectively 50cm and 10cm; Fixed separation diffusion floor height 10cm, filling particle diameter is the quartz sand of 5-10mm; Positive and negative electrode is activated carbon fiber, counterpoise 50g.Positive and negative electrode links to each other with low-voltage dc power supply by the titanium silk.The interpolation mass ratio of anion-cation exchange resin is 1: 2 in the anaerobic digestion unit, negatively charged ion is strong-basicity styrene series anion exchange resin (model is 717), and resin cation (R.C.) is strongly acidic styrene type cation exchange resin (model is 732).Resin is wrapped up by nylon gauze, adds total amount and accounts for 2% of anaerobic digestion unit volume.
Treatment process:
Unloading phase, cultivate: the cultivation of anaerobic digestion unit the unloading phase carrying out experiencing one before the anaerobic sludge digestion.The unloading phase, (32-35 ℃) drops into moisture 99.0% fresh sludge under the medium temperature condition in the anaerobic digestion district, and add the mixed solution of the butyric acid of the propionic acid contain 1.0% starch, 5mM and 5mM, cultivate a week, then weekly in the ratio of anaerobic digestion unit volume 30%, with above-mentioned mixed solution displacement, continued for three weeks.Meanwhile, carry out anoxic digestion unit the unloading phase cultivation.In anoxic digestion unit, add 0.2% fresh sludge, add SODIUMNITRATE and the 3mM sodium sulphite of 3mM, cultivate a week; Then every circumferentially anoxic digests the nitric acid that adds 3mM in the unit, continues for three weeks.
Sludge treatment: under the medium temperature condition (32-35 ℃), pending mud enters the anaerobic digestion unit by the mud admission port 8 of anaerobic digestion unit.The weekly input amount of moisture 95% mud (TOC content 18g/L) is 5.0L; Mud output 4.0L weekly, the mud mean residence time closed 21 days; Approximately the liquid of 1.0L slowly flows into anoxic digestion unit from the anaerobic digestion unit weekly, then flows out through peroxide of iron filtering unit through the anoxic unit water outlet.The pH of anoxic digestion unit adds nitric acid by water-in and maintains between the 5-10.Impressed voltage 0.4V between anaerobic digestion unit 1 and the anoxic digestion unit 2.Methane and nitrogen that anaerobic digestion and anoxic digestion produce are collected by venting port 12.The result demonstration, the TOC that discharges mud on average maintains under the 7g/L, and clearance is more than 60%, and the ammonia-nitrogen content of the water outlet of ferric oxide filtering unit is more than 400mg/L, and the content of hydrogen sulfide is lower than 0.3% in the anoxic exhaust.
Difference from Example 1 is: the water content of pending mud is 90%; The interpolation mass ratio 1: 1 of anion-cation exchange resin in the anaerobic digestion unit, negatively charged ion is strong-basicity styrene series anion exchange resin, resin cation (R.C.) is strongly acidic styrene type cation exchange resin, adds total amount and accounts for 3% of anaerobic digestion unit volume; The weekly input amount of mud (TOC content 24g/L) is 3.0L; The mud output is 2.5L weekly, and the mud mean residence time closed 35 days; Approximately the liquid of 0.5L slowly enters anoxic digestion unit continuously from the anaerobic digestion unit weekly, then flows out through peroxide of iron filtering unit through the anoxic unit water outlet; Impressed voltage is 0.6V.The result demonstration, the TOC that discharges mud on average maintains under the 9g/L, and clearance is more than 60%, and the ammonia-nitrogen content of the water outlet of ferric oxide filtering unit is more than 600mg/L, and the content of hydrogen sulfide is lower than 0.4% in the anoxic exhaust.
Embodiment 3
Difference from Example 1 is: the water content of pending mud is 85%; The interpolation mass ratio 1: 1 of anion-cation exchange resin in the anaerobic digestion unit, negatively charged ion is strong-basicity styrene series anion exchange resin, resin cation (R.C.) is strongly acidic styrene type cation exchange resin, adds total amount and accounts for 4% of anaerobic digestion unit volume; The weekly input amount of mud (TOC content 36g/L) is 2.0L; The mud output is 1.5L weekly, and the mud mean residence time closed 53 days; Approximately the liquid about 0.5L slowly enters anoxic digestion unit from the anaerobic digestion unit weekly, then flows out through peroxide of iron filtering unit through the anoxic unit water outlet; Impressed voltage is 0.8V.The result demonstration, the TOC that discharges mud on average maintains under the 12g/L, and clearance is more than 65%, and the ammonia-nitrogen content of the water outlet of ferric oxide filtering unit is more than 900mg/L, and the content of hydrogen sulfide is lower than 0.5% in the anoxic exhaust.
Claims (11)
1. the treatment unit of a municipal sludge high-concentration anaerobic digestion, it is characterized in that: comprise anaerobic digestion unit (1), anoxic digestion unit (2) and ferric oxide filtering unit (3), the enclosure interior of described treatment unit is provided with fixed separation diffusion layer (5), this fixed separation diffusion layer (5) is divided into anaerobic digestion unit (1) and anoxic digestion unit (2) with enclosure interior, and positive and negative electrode (6) minute is in anaerobic digestion unit (1) and anoxic digestion unit (2) is interior, separate by fixed separation diffusion layer (5); Be provided with anion-cation exchange resin in the anaerobic digestion unit (1) and load in mixture post (4), be respectively equipped with mud admission port (8), mud relief outlet (9) in the two side of anaerobic digestion unit (1); Water-in (10) and water outlet (11) are located at respectively the two side of anoxic digestion unit (2), and described water outlet (11) connects ferric oxide filtering unit (3) and water port (13) successively.
2. by the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 1, it is characterized in that: described positive and negative electrode (6) links to each other with external source low-voltage dc power supply (7).
3. by the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 2, it is characterized in that: the voltage of described external source low-voltage dc power supply (7) is 0.4-1.0V.
4. by the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 1, it is characterized in that: described anoxic digestion top, unit (2) is provided with venting port (12).
5. by the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 1, it is characterized in that: described anaerobic digestion unit (1) is 5:1-10:1 with the volume ratio of anoxic digestion unit (2).
6. by the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 1, it is characterized in that: anion-cation exchange resin loads in mixture the 1-5% that post (4) accounts for the anaerobic digestion unit volume.
7. by the treatment unit of claim 1 or 6 described municipal sludge high-concentration anaerobic digestions, it is characterized in that: described anion-cation exchange resin loads in mixture the mass ratio 3:1-1:3 of the anion-cation exchange resin in the post (4).
8. press the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 1, it is characterized in that: described mud admission port (8) and mud relief outlet (9) lay respectively at the both sides of anaerobic digestion unit (1) axial cross section, and mud relief outlet (9) is higher than mud admission port (8).
9. the using method of the treatment unit of a municipal sludge high-concentration anaerobic digestion claimed in claim 1, it is characterized in that: in the anaerobic digestion unit, add pending mud, utilize in the anaerobic digestion unit anion-cation exchange resin to load in mixture and add recycled anion-cation exchange resin in the post, be aided with anoxic digestion unit, and between anaerobic digestion unit and anoxic digestion unit, apply low-voltage dc voltage, the inner acidic meta-bolites accumulation of reduction anaerobic digestion unit, the system stability of raising municipal sludge high-concentration anaerobic digestion.
10. by the using method of the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 9, it is characterized in that: describedly between anaerobic digestion unit and anoxic digestion unit, separate with fixed separation diffusion layer; Fill the quartz sand of particle diameter 5-10mm in the diffusion layer.
11. press the using method of the treatment unit of municipal sludge high-concentration anaerobic digestion claimed in claim 10, it is characterized in that: the pH in the described anoxic digestion unit is controlled between the 5-10 by adding nitric acid.
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| CN103991955B (en) * | 2013-02-19 | 2015-06-10 | 中国科学院沈阳应用生态研究所 | Dynamic monitoring method and dynamic monitoring device for gas generation in anaerobic digestion process |
| CN104003594B (en) * | 2014-05-14 | 2016-05-04 | 上海交通大学 | Improve the method for sewage plant sludge bio-stabilization speed |
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| JP2003340408A (en) * | 2002-05-24 | 2003-12-02 | Takuma Co Ltd | Treatment system and treatment method for methane fermentation |
| JP2004154762A (en) * | 2002-09-10 | 2004-06-03 | Sanyo Electric Co Ltd | Waste treatment system |
| CN1278956C (en) * | 2004-07-30 | 2006-10-11 | 中国科学院沈阳应用生态研究所 | Apparatus and application for enhancing treating efficiecy of up flowing type anaerobic sludge bed by cathode hydrogen |
| DE602005021673D1 (en) * | 2004-10-19 | 2010-07-15 | Bio Circuit Aps | METHOD AND DEVICE FOR PRODUCING BIOGAS WITH ANAEROUS HYDROLYSIS |
| CN102126789B (en) * | 2010-01-18 | 2013-03-27 | 中国科学院沈阳应用生态研究所 | Method and device for removing nitrates from drinking water |
| CN102101718B (en) * | 2011-01-11 | 2012-09-05 | 彭永臻 | Sludge hydrolysis acidification coupling denitrification device and treatment method thereof |
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