CN102776240B - Method for increasing sludge fermenting volatile acid output - Google Patents
Method for increasing sludge fermenting volatile acid output Download PDFInfo
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- CN102776240B CN102776240B CN201210249813.5A CN201210249813A CN102776240B CN 102776240 B CN102776240 B CN 102776240B CN 201210249813 A CN201210249813 A CN 201210249813A CN 102776240 B CN102776240 B CN 102776240B
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Abstract
The invention belongs to the technical field of environment protection, and particularly relates to a method for increasing sludge fermenting volatile acid output. The method comprises the steps of: adding municipal sludge into a reactor; adding humic acid at the same time; controlling the pH (Potential Of Hydrogen), the temperature and the time of the substrate in the reactor; and carrying out anaerobic fermentation to generate acid, wherein the concentration of humic acid is determined as follows: 0.2 to 200mg of humic acid is added corresponding to 1g of sludge volatile suspending solid, the pH is controlled to between 7.5 to 11, the temperature is controlled to at 25 or 35 DEG C, and the fermentation is carried out for 2 to 20 days. By adopting the method, about 60% of volatile acid output in sludge fermentation is increased when a certain amount of humic acid is added and a proper technological condition is provided.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to a kind of method that improves sludge fermentation volatile acid output.
Background technology
Along with the increase of urban population density and the expanding day of Urban Scale, need municipal wastewater amount to be processed also to increase thereupon, and then cause Sewage Plant to face a large amount of pending excess sludges.In excess sludge, not only contain the objectionable impuritiess such as pathogenic micro-organism, heavy metal, also have inorganic salt and large amount of organic (being mainly protein and carbohydrate) simultaneously.At present often excess sludge is carried out to anaerobically fermenting to reach the object of minimizing, stabilization and resource utilization.
In mud, organism can produce the materials such as volatile acid, hydrogen, methane through anaerobically fermenting, wherein volatile acid can be used for municipal effluent denitrogenation dephosphorizing supplementary carbon source, biosynthesizing PHA raw material and be used for producing hydrogen and methane.Without the simple anaerobically fermenting of any supplementary means, can only make excess sludge produce a small amount of volatile acid, in order to improve as much as possible sludge anaerobic fermentation volatile acid output, the at present main means such as mechanical process (as ultrasonic), chemical method (acid-alkali treatment), thermal treatment, enzymolysis process that adopt.
Humic acid is the larger molecular organics matter that occurring in nature extensively exists, and its stable and complicated organism that to be plant and animal residues form through long-term physics, chemistry, biological action, is widely used in the fields such as Agriculture, forestry And Animal Husbandry, oil, chemical industry, building materials.A lot of research shows at present, and humic acid not only can affect the Transport And Transformation of inorganic metal and (see document Ore Geology Reviews, 1996,11 (1-3): 1-31; Applied Geochemistry, 2012,27 (2): 378-389) can also promote complicated organic biological degradation (to see document Applied Microbiology and Biotechnology, 2011,91 (2): 417-424; International Biodeterioration & Biodegradation, 2009,63 (7): 923-927).The organism that the excess sludge of urban wastewater treatment firm contains many complicated components and difficult degradation, in conjunction with this seminar former studies achievement, (see document Environmental Science & Technology, 2006,40 (6): 2025-2029) can consider suitably to add under alkaline condition a certain amount of humic acid promote mud in organic decomposition produce more volatile acid, and further improve its stable degree.
summary of the invention:
The object of the present invention is to provide a kind of method that improves sludge fermentation volatile acid output.
The method of the raising sludge fermentation volatile acid output that the present invention proposes, concrete steps are as follows:
Municipal sludge is joined in reactor, and add humic acid, control substrate alkaline pH value, temperature and time in reactor, carry out anaerobic fermentation and acid production; Wherein: described humic acid concentration is that every g mud volatile suspended solid correspondence adds 0.2 ~ 200 mg humic acid; PH value is controlled at 7.5 ~ 11; Temperature is controlled at 25 ℃ or 35 ℃; Fermentation number of days is 2 ~ 10d.
In the present invention, described humic acid is natural humus acid purification thing, and outward appearance is chocolate amorphous powder.
In the present invention: humic acid dosage is that every g mud volatile suspended solid adds 10mg, and anaerobically fermenting pH value is 10, and temperature is 35 ℃, and fermentation number of days is 6d.
The invention has the beneficial effects as follows:
(1) improved municipal sludge anaerobically fermenting volatile acid ultimate production, the total volatile acid output of control group of preferably not adding humic acid compared with similarity condition under implementation condition improves 60% left and right.
(2) operational condition of the present invention is simple easily implements, and humic acid used is cheap and easy to get, and the method that improves volatile acid output compared with thermal treatment, ultrasonic etc. is cost-saving.
(3) the present invention has improved the resource utilization efficiency of municipal sludge, has further promoted sludge stabilizing.
Embodiment
Below in conjunction with embodiment, be described in further detail, be to be understood that the example of lifting, just for the present invention that explains, does not comprise all the elements of the present invention below.
Embodiment 1
After being removed to bulk foreign material, municipal sludge is concentrated into VSS 10g/L(TSS ≈ 14g/L, pH ≈ 6.86, TCOD ≈ 14200mg/L), getting the mud of 3L after concentrated, to add volume be the synthetic glass anaerobic reaction device of 5L, humic acid dosage is 10mg humic acid/g VSS, regulate pH 7.5,25 ℃ of temperature, anaerobism stirs 4d.Gained volatile acid concentration is 483mg COD/L.
Embodiment 2
In municipal sludge, add the humic acid that ratio is 0.2mg/g VSS, regulate pH 7.5,35 ℃ of temperature, anaerobism stirs 6d, and other operate with embodiment 1.Gained volatile acid concentration is 1153mg COD/L.
Embodiment 3
In municipal sludge, add the humic acid that ratio is 2mg/g VSS, regulate pH 8,35 ℃ of temperature, anaerobism stirs 6d, and other operate with embodiment 1.Gained volatile acid concentration is 1885mg COD/L.
Embodiment 4
In municipal sludge, add the humic acid that ratio is 5mg/g VSS, regulate pH 8,35 ℃ of temperature, anaerobism stirs 2d, and other operate with embodiment 1.Gained volatile acid concentration is 1031mg COD/L.
Embodiment 5
In municipal sludge, add the humic acid that ratio is 30mg/g VSS, regulate pH 9,25 ℃ of temperature, anaerobism stirs 4d, and other operate with embodiment 1.Gained volatile acid concentration is 1450mg COD/L.
Embodiment 6
In municipal sludge, add the humic acid that ratio is 0.2mg/g VSS, regulate pH 9,35 ℃ of temperature, anaerobism stirs 8d, and other operate with embodiment 1.Gained volatile acid concentration is 2089mg COD/L.
Embodiment 7
In municipal sludge, add the humic acid that ratio is 2mg/g VSS, regulate pH 10,35 ℃ of temperature, anaerobism stirs 6d, and other operate with embodiment 1.Gained volatile acid concentration is 3255mg COD/L.
Embodiment 8
In municipal sludge, add the humic acid that ratio is 10mg/g VSS, regulate pH 10,35 ℃ of temperature, anaerobism stirs 6d, and other operate with embodiment 1.Gained volatile acid concentration is 4276mg COD/L.
Embodiment 9
In municipal sludge, add the humic acid that ratio is 100mg/g VSS, regulate pH 10,35 ℃ of temperature, anaerobism stirs 4d, and other operate with embodiment 1.Gained volatile acid concentration is 2813mg COD/L.
Embodiment 10
In municipal sludge, add the humic acid that ratio is 200mg/g VSS, regulate pH 10,25 ℃ of temperature, anaerobism stirs 10d, and other operate with embodiment 1.Gained volatile acid concentration is 2667mg COD/L.
Embodiment 11
In municipal sludge, add the humic acid that ratio is 50mg/g VSS, regulate pH 11,25 ℃ of temperature, anaerobism stirs 2d, and other operate with embodiment 1.Gained volatile acid concentration is 720mg COD/L.
Embodiment 12
In municipal sludge, add the humic acid that ratio is 10mg/g VSS, regulate pH 11,35 ℃ of temperature, anaerobism stirs 4d, and other operate with embodiment 1.Gained volatile acid concentration is 1989mg COD/L.
The above-mentioned description to embodiment is can understand and apply the invention for the ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and the improvement of making for the present invention and modification all should be within protection scope of the present invention.
Claims (3)
1. improve a method for sludge fermentation volatile acid output, it is characterized in that concrete steps are as follows:
Municipal sludge is joined in reactor, and add humic acid, control substrate alkaline pH value, temperature and time in reactor, carry out anaerobic fermentation and acid production; Wherein: described humic acid concentration is that every g mud volatile suspended solid correspondence adds 0.2 ~ 200 mg humic acid; PH value is controlled at 7.5 ~ 11; Temperature is controlled at 25 ℃ or 35 ℃; Fermentation number of days is 2 ~ 10d.
2. method according to claim 1, is characterized in that: described humic acid is natural humus acid purification thing.
3. method according to claim 1, is characterized in that humic acid dosage is that every g mud volatile suspended solid adds that 10 mg, anaerobically fermenting pH are controlled at 10, temperature is that 35 ℃, fermentation number of days are 6d.
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| CN101085997A (en) * | 2006-06-09 | 2007-12-12 | 同济大学 | Method for promoting organic acid yield from sludge |
| CN101684050B (en) * | 2008-09-25 | 2013-04-24 | 兰州交通大学 | Urban sludge rapid stabilization treatment method |
| CN101768609A (en) * | 2009-09-01 | 2010-07-07 | 同济大学 | Method for improving sludge anaerobic fermentation and acid production |
| CN102476897A (en) * | 2010-11-24 | 2012-05-30 | 天津市塘沽区鑫宇环保科技有限公司 | Novel sludge treatment method |
| CN102586344B (en) * | 2012-03-19 | 2014-12-10 | 同济大学 | Method for producing volatile fatty acid through heating and circular anaerobic fermentation of sludge |
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