CN102863134B - Anaerobic sludge digestion improving method - Google Patents
Anaerobic sludge digestion improving method Download PDFInfo
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- CN102863134B CN102863134B CN201210340171.XA CN201210340171A CN102863134B CN 102863134 B CN102863134 B CN 102863134B CN 201210340171 A CN201210340171 A CN 201210340171A CN 102863134 B CN102863134 B CN 102863134B
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- digestion
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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
- 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
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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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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Abstract
The invention discloses an anaerobic sludge digestion improving method. The anaerobic sludge digestion improving method comprises the following steps of: extracting part of digesting fluid from a digestion tank when accumulated gas volume produced in a cycle after the entry of sludge is 70-90% of total gas volume produced in the cycle during the semicontinuous anaerobic sludge digestion, adding soluble hydroxide into the extracted digesting fluid for cracking treatment, adjusting pH value of the digesting fluid to 7-8 and returning the digesting fluid into the digestion tank if the pH value of the digesting fluid subjected to the cracking treatment is larger than 8, and directly returning the digesting fluid into the digestion tank if the digesting fluid subjected to the cracking treatment is smaller than or equal to 8. According to the anaerobic sludge digestion improving method disclosed by the invention, organic matter degradation rate can be increased, and the yield of methane produced by anaerobic digestion can be increased.
Description
Technical field
The invention belongs to solid waste disposal, disposal technology field, be specifically related to a kind of improvement method of anaerobic sludge digestion.
Background technology
Along with China's level of urbanization improves constantly, sewage treatment facility high speed development, sewage load and processing rate are all in steady increase.Yet, as the excess sludge of sewage disposal by product, also rolling up.In water ratio 80%, the annual dewatered sludge in the whole nation (referring to the mud that water ratio that excess sludge forms after preliminary hydro-extraction is 75-85%) output has reached 30,000,000 tons.Because mud contains multiple harmful substances, may work the mischief to ecotope, must deal carefully with disposal, the method for disposal that mud is conventional comprises landfill, compost, burning, building materials processed etc.
Because sludge creation amount is large, transportation and processing costs are high, before sludge disposal, first will realize minimizing, reduce volume and the quality of mud.Conventional sludge reduction method comprises thickening, anaerobic digestion etc.Anaerobic digestion is the important means that Sewage Plant realizes sludge reduction, and it not only can make the organic matter degradation 30 ~ 50% in mud, and the biogas producing can also be as clean energy, thereby realizes the recycling of mud.On the U.S., Europe and other places, anaerobic digestion is the main sludge treatment facility of most of sewage works, especially Large Sewage Treatment Plant.In China, also there are tens of Sewage Plant to adopt anaerobic digestion process.Yet due to problems such as China's mud organic matter are on the low side, sand content is high, digestion techniques accumulation is not enough, part digestion facility can not normally move, part digestion facility organic matter degradation rate and gas production rate do not reach design objective.Due to the recycling of sludge biogas production and biogas, be the key factor that affects anaerobic digestion economy, therefore, anaerobic sludge digestion has been subject to certain limitation in the application of China.
In anaerobic digestion process, for entering mud, the degradation rate of mud organic matter reduces gradually, and mud organic matter is when just dropping into digester, and because a lot of organic matters are dissolved state or easy stripping state, degradation rate is the fastest, and gas producing efficiency is the highest; As time goes on, organic matter consumes gradually, and degradation rate also starts to reduce, although cumulative gas production is increasing, the gas production rate of unit time starts to reduce; Along with exhausting of most of solvability easily biodegradable organics, dissolved organic matter seldom, most of organism remains in live anaerobic bacteria, dead microorganism and anaerobic sludge flco (particle), because cell walls and colloidal structure are difficult to destroy degraded, this part organic matter is difficult to be utilized by other anaerobion, aerogenesis is also slower, is tending towards stopping.Be limited by the degradation rule of mud organic matter, the mud organic matter degradation rate of a lot of anaerobic digestion facilities only has 30 ~ 35%, and biogas generation is also lower.
Summary of the invention
Technical problem to be solved by this invention is: make up above-mentioned the deficiencies in the prior art, propose a kind of improvement method of anaerobic sludge digestion, can increase mud organic matter degradation rate, improve the methane gas producing amount of anaerobic digestion.
Technical problem of the present invention is solved by following technical scheme:
A kind of improvement method of anaerobic sludge digestion, comprise the steps: in the semicontinuous anaerobic digestion process of mud, in one-period after entering mud, when the accumulation aerogenesis volume in this cycle reach total aerogenesis volume of this cycle 70 ~ 90% time, from digester, extract part Digestive system, add wherein the oxyhydroxide of solubility to crack processing, if crack the pH of the Digestive system after processing > 8, regulate its pH to pass back into digester after 7 ~ 8, if crack pH≤8 of the Digestive system after processing, directly pass back into digester.
For semi continuous anaerobic sludge digestion, sludge retention time is generally 20 ~ 30 days, contriver finds by research, after entering mud in one-period, enter degraded and aerogenesis organic in mud most effective in the initial stage, through the quick aerogenesis stage, gas production rate reduces gradually, the dissolved organic matter that most of easy degraded is described has been degraded, therefore, after the quick aerogenesis stage finishes, cumulative gas production within this cycle account for this cycle total gas production 70 ~ 90% time, can extract part Digestive system carries out alkali and cracks and process and be back to digester, thereby discharge the organic matter of mud granule inside, make the organic further degraded of mud, methane gas producing amount rebound significantly.When the consumption of the oxyhydroxide of solubility lower, and Digestive system extracts ratio when higher, Digestive system pH value after finishing dealing with is likely below 8, now can regulate pH value directly to pass back into digester, as the digestion pH of mixed value after finishing dealing with is more than 8, need to use acid for adjusting pH in 7 ~ 8 scopes.
Preferably, the Digestive system of extraction accounts for 5 ~ 15% of the interior Digestive system cumulative volume of digester.
Research finds, in order to guarantee the overall activity of anaerobion in digester, the extraction ratio of digestion mixed solution is unsuitable excessive, extracts 5 ~ 15% better.
Preferably, add after the oxyhydroxide of solubility, the concentration of the oxyhydroxide of described solubility in the Digestive system extracting is 1.2 ~ 2.4 g/L.
Experimental results show that, control the concentration of alkali in the Digestive system extracting, can impel cracking of a small amount of live anaerobic bacteria, dead bacterium and part flco, and disintegration effect improves along with the raising of concentration, but when their concentration surpasses 2.4g/L, the degree that disintegration effect improves reduces, and when alkali concn is lower than 1.2g/L, disintegration effect is limited, is difficult to obviously improve anaerobic sludge digestion.
Preferably, the time of cracking processing described in is 30 ~ 120 min.
Disintegration effect improves with the increase in treatment time, but surpasses 120 min when the treatment time, and the degree that disintegration effect improves reduces, and research is found to crack processing in 30 ~ 120 min, and efficiency is better.
Preferably, the oxyhydroxide of described solubility is selected from NaOH, KOH and Ca (OH)
2in at least one.
Further preferably, the oxyhydroxide of described solubility is selected from least one in NaOH and KOH.
For Digestive system, the disintegration effect of NaOH and KOH is better than Ca (OH)
2so suitable, adopt NaOH or KOH or its mixture and make NaOH or KOH or the concentration of its mixture in the Digestive system extracting are that 1.2 ~ 2.4g/L cracks processing, experimental results show that and can make like this mud organic matter degradation rate can be increased to 40 ~ 45%, the daily output tolerance of biogas can improve 20 ~ 40%.
The present invention also tool has the following advantages: 1, do not affect original anaerobic sludge digestion technique, do not need former facility to carry out large change, from digester, extract digestion mixed solution and can utilize former spoil disposal facility, or the mud of sludge circulation stirring system, sludge circulation heating facility flows out pipeline; 2, add the oxyhydroxide of inorganic solubility to crack processing to part Digestive system, simple to operate, cost is low; 3, to improve effect remarkable for anaerobic sludge digestion, and gas production rate generally can improve 20 ~ 40%.
Accompanying drawing explanation
Fig. 1 cracks the schematic diagram of processing in one-period in the semicontinuous anaerobic digestion process of the mud in one embodiment of the present invention;
Fig. 2 is that the alkali in a preferred embodiment of the present invention cracks the mud and the relative cumulative gas production contrast schematic diagram that cracks the mud of processing without alkali after processing.
Embodiment
Contrast accompanying drawing below and in conjunction with preferred embodiment, the present invention be explained in detail.
The invention provides a kind of improvement method of anaerobic sludge digestion, in one embodiment, as shown in Figure 1, comprise the steps: in the semicontinuous anaerobic digestion process of mud, in one-period after entering mud, when the accumulation aerogenesis volume in this cycle reach total aerogenesis volume of this cycle 70 ~ 90% time, from digester, extract part Digestive system, add wherein the oxyhydroxide of solubility to crack processing, if crack the pH of the Digestive system after processing > 8, regulate its pH to pass back into digester after 7 ~ 8, if crack pH≤8 of the Digestive system after processing, directly pass back into digester.
Some preferred embodiment in, the oxyhydroxide of solubility is selected from NaOH, KOH and Ca (OH)
2in at least one.
In a preferred embodiment, adopt NaOH or KOH or its mixture and make NaOH or KOH or the concentration of its mixture in the Digestive system extracting are that 1.2 ~ 2.4g/L cracks processing, as shown in Figure 2, mud organic matter degradation rate can be increased to 40 ~ 45%, and the daily output tolerance of biogas can improve 20 ~ 40%.
For semi continuous anaerobic sludge digestion, sludge retention time is generally 20 ~ 30 days, the present invention is applicable to the semicontinuous anaerobic digestion of the multiple mud such as sewage work's primary sludge, excess sludge, mixing sludge, microbial film mud, and below by preferred embodiment, the present invention is described in detail.
embodiment mono-
Certain urban wastewater treatment firm produces the mud (mixing sludge of primary sludge and microbial film mud, primary sludge is main, account for 85wt%), after concentrated, water ratio is the percentage ratio that 98%(water ratio refers to the weight of contained humidity in mud and the ratio of mud gross weight, lower same), organic content is that 56%(refers to that organic matter accounts for the massfraction of the solid body of mud, lower same), adopt semi continuous anaerobic digestion, sludge retention time is 20 days, entering sludge discharging period is 24 h, organic mass ratio in mud before the about 35%(of organic matter degradation rate refers to process quality organic in rear mud and processes, lower same), when one-period is 24h, during 10th ~ 12h after entering mud, the accumulation aerogenesis volume in this cycle can reach 70 ~ 90% of total aerogenesis volume of this cycle, during the 10h of the present embodiment after entering mud, extract 15% Digestive system, add NaOH, and to make the concentration of NaOH in the Digestive system extracting be 1.2 g/L, crack and process 120 min, then regulating pH is 8, be back to digester.The organic matter degradation rate of the mud of processing through the present embodiment can be increased to 40%, and every day, gas production rate can improve 20%.
embodiment bis-
Certain urban wastewater treatment firm produces the mud (mixing sludge of primary sludge and excess sludge, excess sludge is main), after concentrated, water ratio is 98%, organic content is 68%, adopt semicontinuous anaerobic digestion, sludge retention time is 20 days, entering sludge discharging period is 24 h, organic matter degradation rate approximately 33%, after entering mud 12 hours, extract 10% Digestive system, add KOH, and to make the concentration of KOH in the Digestive system extracting be 2.4 g/L, crack and process 60 min, then regulating pH is 8, is back to digester.The organic matter degradation rate of the mud of processing through the present embodiment can be increased to 45%, and every day, gas production rate can improve 40%.
embodiment tri-
Certain urban wastewater treatment firm produces the mud (mixing sludge of primary sludge and excess sludge, excess sludge is main), after concentrated, water ratio is 98%, organic content is 68%, adopt semicontinuous anaerobic digestion, sludge retention time is 20 days, entering sludge discharging period is 8 h, organic matter degradation rate approximately 35%, when one-period is 8h, during approximately 4h after entering mud, the accumulation aerogenesis volume in this cycle can reach 70 ~ 90% of total aerogenesis volume of this cycle, after entering mud 4 hours of the present embodiment, extract 5% Digestive system, add NaOH, and to make the concentration of NaOH in the Digestive system extracting be 1.8g/L, crack and process 30 min, then regulating pH is 7, be back to digester.The organic matter degradation rate of the mud of processing through the present embodiment is increased to 42%, and every day, gas production rate improved 31%.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, make some being equal to substitute or obvious modification, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. the improvement method of an anaerobic sludge digestion, it is characterized in that comprising the steps: in the semicontinuous anaerobic digestion process of mud, in one-period after entering mud, when the accumulation aerogenesis volume in this cycle reach total aerogenesis volume of this cycle 70～90% time, from digester, extract part Digestive system, the Digestive system extracting accounts for 5～15% of the interior Digestive system cumulative volume of digester, add wherein the oxyhydroxide of solubility to crack processing, if crack the pH of the Digestive system after processing > 8, regulate its pH to pass back into digester after 7～8, if crack pH≤8 of the Digestive system after processing, directly pass back into digester.
2. the improvement method of anaerobic sludge digestion as claimed in claim 1, is characterized in that: add after the oxyhydroxide of solubility, the concentration of the oxyhydroxide of described solubility in the Digestive system extracting is 1.2～2.4g/L.
3. the improvement method of anaerobic sludge digestion as claimed in claim 1, is characterized in that: described in crack processing time be 30～120min.
4. the improvement method of anaerobic sludge digestion as claimed in claim 2, is characterized in that: the oxyhydroxide of described solubility is selected from least one in NaOH and KOH.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210340171.XA CN102863134B (en) | 2012-09-14 | 2012-09-14 | Anaerobic sludge digestion improving method |
| HK13102311A HK1175768A1 (en) | 2012-09-14 | 2013-02-22 | A method for improving sludge anaerobic digestion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210340171.XA CN102863134B (en) | 2012-09-14 | 2012-09-14 | Anaerobic sludge digestion improving method |
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| CN102863134A CN102863134A (en) | 2013-01-09 |
| CN102863134B true CN102863134B (en) | 2014-01-15 |
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| HK (1) | HK1175768A1 (en) |
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| CN110818217A (en) * | 2019-11-28 | 2020-02-21 | 湖南大学 | Method for strengthening anaerobic digestion of excess sludge by combined pretreatment of freezing and free nitrous acid |
| CN113045160A (en) * | 2021-04-01 | 2021-06-29 | 湖南大学 | Sludge treatment method for improving residual sludge methane yield through reflux of digestive fluid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100489696B1 (en) * | 2003-04-08 | 2005-05-17 | 한국생산기술연구원 | Method for enhanced anaerobic digestion of waste activated sludge |
| CN101037287A (en) * | 2007-03-05 | 2007-09-19 | 清华大学 | Method of resource protection, decrement treatment of town sewage and sludge |
| CN101565262A (en) * | 2009-06-04 | 2009-10-28 | 同济大学 | Combined pre-treatment method for improving sludge disintegration effect and strengthening subsequent anaerobic digestion |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317498A (en) * | 1999-05-11 | 2000-11-21 | Unitika Ltd | Treatment of anaerobically treated sludge md anaerobic digestion method for anaerobically digested sludge |
| CN102583932A (en) * | 2012-03-19 | 2012-07-18 | 同济大学 | Method for generating methane by enhancing anaerobic digestion of reflux sludge after heat and alkaoline combined treatment and circulation |
-
2012
- 2012-09-14 CN CN201210340171.XA patent/CN102863134B/en not_active Expired - Fee Related
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- 2013-02-22 HK HK13102311A patent/HK1175768A1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100489696B1 (en) * | 2003-04-08 | 2005-05-17 | 한국생산기술연구원 | Method for enhanced anaerobic digestion of waste activated sludge |
| CN101037287A (en) * | 2007-03-05 | 2007-09-19 | 清华大学 | Method of resource protection, decrement treatment of town sewage and sludge |
| CN101565262A (en) * | 2009-06-04 | 2009-10-28 | 同济大学 | Combined pre-treatment method for improving sludge disintegration effect and strengthening subsequent anaerobic digestion |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2000-317498A 2000.11.21 |
| 强化污泥厌氧消化预处理技术的研究进展;胡亚冰等;《安徽农业科学》;20090210;第37卷(第04期);第1737-1739、1747页 * |
| 胡亚冰等.强化污泥厌氧消化预处理技术的研究进展.《安徽农业科学》.2009,第37卷(第04期),第1737-1739、1747页. |
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| HK1175768A1 (en) | 2013-07-12 |
| CN102863134A (en) | 2013-01-09 |
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