CN1803667A - Method for improving operation stability of anaerobic reactor - Google Patents
Method for improving operation stability of anaerobic reactor Download PDFInfo
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- CN1803667A CN1803667A CNA2005101230302A CN200510123030A CN1803667A CN 1803667 A CN1803667 A CN 1803667A CN A2005101230302 A CNA2005101230302 A CN A2005101230302A CN 200510123030 A CN200510123030 A CN 200510123030A CN 1803667 A CN1803667 A CN 1803667A
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Abstract
The invention provides a method to improve running stability and prevent methylacetic acid accumulation for anaerobic reactor. Wherein, adding outer methylacetic acid and nickel ion both of given concentration during treating anaerobic sludge to enhance the decomposition capacity of the sludge to degrade excessive methylacetic acid when the concentration of methylacetic acid rising as technique condition varying during reactor running. This invention improves reactor stability to feed-water impact and technique condition oscillating (as in figure 3).
Description
One, technical field
The present invention relates to a kind of method that improves operation stability of anaerobic reactor, belong to the sewage disposal technology in the environmental engineering field, be mainly used in the anaerobic biological treatment process of high concentrated organic wastewater.
Two, technical background
The anaerobic digestion that is otherwise known as of the anaerobic biological treatment technology of high concentrated organic wastewater, be by fermented type bacterium and methane-producing bacteria under anaerobic cometabolism organic pollutant is decomposed and produces CH
4And CO
2Process.Compare with the aerobic treatment of routine, anaerobic digestion process has advantages such as organic loading height, energy expenditure is low, excess sludge production is few when handling organic waste water, the biogas that produces in the anaerobic digestion process is again a kind of very good energy simultaneously, is a kind of very promising organic pollutant treatment process.Especially after the seventies in 20th century, succeeded in developing anaerobism upflow sludge bed reactor (UASB reactor), this is that the anaerobic reactor of principal character has higher Pollutant Treatment efficient with the granule sludge, being widely used in various types of high concentration organic sewages in nearly 20 years in the past handles, as industries such as food, papermaking, fermentation, livestock cultures, anaerobic technique is also being obtained tangible progress aspect the low-concentration organic waste waters such as processing town domestic sewage in recent years.The present water pollution situation of China belongs to typical comprehensive organic contamination, and the research and development of therefore strengthening the efficient anaerobic treatment process has very important significance for extenuating pollution situation.
Whole anaerobic treatment process can be regarded as the microorganism synergy of various interdependences, the most complicated organism of series connection of process series reaction is converted into the process of methane, roughly can be divided into hydrolysis, acidifying, product hydrogen product acetate and produce the methane four-stage.Organism in acidication complexity in the stage is decomposed generation ethanol and a large amount of low molecular weight volatile organic acids (VFA) by fermenting bacteria, mainly comprises formic acid, acetate, propionic acid, butyric acid and lactic acid etc.; If VFA can not be timely is removed with the form of methane, a large amount of accumulation just might appear in system, and cause anaerobic system " to become sour ".
The phenomenon of " becoming sour " is a big problem of restriction anaerobic technique practical application always, and is wherein initial generally from the propionic acid accumulation, can both at first observe the phenomenon of propionic acid accumulation before " becoming sour " situation appears in many anaerobic reactors.After the situation of VFA accumulation appearred in an anaerobic reactor, the most of methane-producing bacteria in the anaerobic sludge was suppressed and stops to produce the methane process, and whole anaerobic reactor can't continue normal degradable organic pollutant, the anaerobic treatment failure.Therefore avoiding occurring organic acid accumulation in the anaerobic treatment process, improve anaerobic system stability is a problem that presses for solution.
Because propionic acid is as a mesostate in system for anaerobic treatment, its change in concentration is subjected to the influence that propionic acid produces speed and propionic acid conversion rate two aspect factors.Investigator in the past thinks that the decisive link that prevents the propionic acid accumulation is to reduce the generation of propionic acid, promptly by control the generation that prior fermentation condition and fermented type reduce or eliminate propionic acid as far as possible, for example by processing condition such as impact load, redox potential rising, toxic pollutant inhibition and pH variation in the control water inlet.But wanting long-term strict control above-mentioned processing condition in actual anaerobic reactor operational process be unusual difficulties, in case condition changing just might cause the change of fermented type, and propionic acid generation increase and cause the generation of " becoming sour " in the device that induces reaction.
Because anaerobic reactor exists system's propionic acid to accumulate in a large number in actual moving process all the time and then the risk of " becoming sour ", many designers in the design anaerobic reactor all to a certain degree reduction sludge loading, wish to improve the operating stability of anaerobic reactor by the mode that lowers efficiency.This also is the anaerobic reactor load of present actual motion can reach load well below testing apparatus a major cause.
Three, summary of the invention
Technical problem the object of the present invention is to provide a kind of method that improves operation stability of anaerobic reactor, prevents that the propionic acid accumulation from appearring in anaerobic reactor in operational process.
Technical scheme
Add certain density propionic acid and trace element by cooperating, improve the capacity of decomposition of anaerobic sludge excessive propionic acid in the anaerobic sludge domestication stage.When occurring propionic acid concentration in the certain limit in the anaerobic reactor operational process and raise, excessive propionic acid can be degraded rapidly, thereby avoids a large amount of propionic acid accumulation to cause " becoming sour ", improves the operation stability of anaerobic reactor.
A kind of method that improves operation stability of anaerobic reactor comprises:
1, in anaerobic reactor according to 0.5KgMLVSS/m
3Dosage inoculation anaerobic reactor excess sludge or according to 0.8KgMLVSS/m
3Dosage inoculation city domestic sewage treatment plant through the excess sludge of Anaerobic Digestion, control enters the volumetric loading of chemical oxygen demand (COD) (COD) in the anaerobic reactor at 0.5～0.6kg/m
3D keeps system stable operation more than 10 days;
2, will intake the COD volumetric loading from 0.6kg/m
3D progressively brings up to 1.5kg/m
3D adds external source propionic acid concentration 0.40mmol/L in this stage, when the COD volumetric loading reaches 1.5kg/m in water inlet
3Steady running is 10 days behind the d;
3, will intake the COD volumetric loading from 1.5kg/m
3D brings up to 3.5kg/m
3D adds external source propionic acid concentration 0.85mmol/L in this stage in water inlet, replenish nickelous chloride (NiCl simultaneously in anaerobic reactor
2) guarantee the nickel ion (Ni of mixed solution in the reactor
2+) concentration reaches between 0.08～0.55mg/L; When the COD volumetric loading reaches 3.5kg/m
3Steady running is 10 days behind the d;
4, will intake the COD volumetric loading from 3.5kg/m
3D progressively brings up to the final operating load of reactor design, at this stage artificial propionic acid that adds 1.10mmol/L in water inlet, replenishes nickelous chloride (NiCl simultaneously in anaerobic reactor
2) guarantee the nickel ion (Ni of mixed solution in the reactor
2+) concentration reaches between 0.08～0.30mg/L;
5, reach the final operating load of reactor and steady running after 15 days when the COD volumetric loading, stop at into and add external source propionic acid and nickel ion in the water, anaerobic sludge domestication end of processing, anaerobic reactor is in normal operating condition and moves continuously.
Beneficial effect
The present invention mainly is the generation that the conversion rate aspect of propionic acid is prevented the propionic acid accumulation from the raising anaerobic sludge.We are by the discovery that studies for a long period of time, add certain density propionic acid by artificial in initial anaerobic sludge domestication process, can improve in the anaerobic sludge methane-producing bacteria to H
2Thereby the speed of utilizing reduce H in the reactor
2Concentration, and H
2The reduction of concentration can be quickened in the anaerobic sludge propionic acid oxidizing bacteria greatly to the decomposition rate of propionic acid, thereby can prevent the generation of propionic acid accumulation in the anaerobic reactor, improves the operation stability of anaerobic reactor.The method of interpolation external source propionic acid of the present invention domestication anaerobic sludge can improve the capacity of decomposition of anaerobic sludge to propionic acid, and the anaerobic reactor that starts under the anaerobic reactor after the perpropionic acid domestication and normal condition is compared, and operation stability obviously improves.
1, test-results shows, the anaerobic sludge after the perpropionic acid domestication all obviously improves (Fig. 1, Fig. 2) to the tolerance and the capacity of decomposition of propionic acid.
(do not add propionic acid at anaerobic sludge after the perpropionic acid domestication and contrast anaerobic sludge, domestication in a usual manner) adding concentration respectively in is 2.0,4.0,8.0,12.0mmol/L propionic acid, relatively they are to ballistic tolerance of different concns propionic acid and degraded situation, result of study is as depicted in figs. 1 and 2: the anaerobic sludge through the perpropionic acid domestication is subjected to showing very strong propionic acid degradation capability after the high density propionic acid impacts, for starting point concentration is the propionic acid impact of 4.0mmol/L, residue propionic acid concentration has been reduced to 0.94mmol/L after 6 hours, and reactor in contrast need be through just reaching identical level in 12 hours; For starting point concentration is the propionic acid impact of 8.0mmol/L and 12.0mmol/L, make after the degraded 10 hours and 16 hours respectively through the anaerobic sludge of perpropionic acid domestication and to remain propionic acid concentration less than 1.0mmol/L, control reactor then shows serious propionic acid and suppresses, and propionic acid concentration does not significantly descend in 16 hours.
2, the operation stability of anaerobic reactor after the propionic acid domestication obviously improves:
We will keep identical operation process condition (water inlet COD concentration, temperature, water inlet pH, redox potential etc.) through anaerobic reactor after the perpropionic acid domestication and control reactor, operation is 60 days continuously, every sampling in 2 days once, the propionic acid change in concentration in the assaying reaction device, result such as Fig. 3.
From experimental result as can be seen, continuously operation 60 days under identical operation process condition, in contrast without the reactor propionic acid fluctuation of concentration scope of perpropionic acid domestication between 0.32～3.04mmol/L, average propionic acid concentration is 1.392mmol/L; And through the anaerobic reactor propionic acid change in concentration scope of perpropionic acid domestication between 0.21～1.12mmol/L, average propionic acid concentration 0.557mmol/L, no matter be that propionic acid concentration numerical value or fluctuation of concentration amplitude all are starkly lower than control reactor, show excellent operation stability.
Four, description of drawings
Fig. 1, through the anaerobic sludge of perpropionic acid domestication degraded situation to propionic acid
The anaerobic sludge (contrast) of Fig. 2, usual manner domestication is to the degraded situation of propionic acid
The variation of propionic acid concentration in the reactor under Fig. 3, the continuous operational conditions
Five, embodiment
Below narrate specific implementation process of the present invention.
For an anaerobic reactor that newly builds up, in reactor according to 0.5KgMLVSS/m
3Dosage inoculate other anaerobic reactor excess sludge (also can be according to 0.8KgMLVSS/m
3Dosage inoculation city domestic sewage treatment plant through the excess sludge of Anaerobic Digestion), control water inlet COD volumetric loading is at 0.5～0.6kg/m then
3D moves continuously, the beginning continous-stable produces biogas in anaerobic reactor, the COD clearance of whole anaerobic reactor is stable to be reached more than 75%, can think that anaerobic reactor reaches steady running on this load level, keep this state to continue operation more than 10 days, enter the Load lifting stage of back;
At original volumetric loading 0.6kg/m
3Progressively improve the 1.5kg/m that loads on the level of d
3.d, in water inlet, add external source propionic acid concentration 0.40mmol/L in this stage, when the COD volumetric loading reaches 1.5kg/m
3.d and water outlet COD clearance is stable reaches more than 70%, can think that anaerobic reactor reaches steady running on this load level, keep this state to continue operation more than 10 days, enter the Load lifting stage of back;
To intake the COD volumetric loading from 1.5kg/m
3.d progressively bring up to 3.5kg/m on the level
3.d, in water inlet, add external source propionic acid concentration 0.85mmol/L, in anaerobic reactor, replenish nickelous chloride (NiCl simultaneously in this stage
2) guarantee the nickel ion (Ni of mixed solution in the reactor
2+) concentration reaches between 0.08～0.55mg/L; When the COD volumetric loading reaches 3.5kg/m
3.d and water outlet COD clearance is stable reaches more than 70%, can think that anaerobic reactor reaches steady running on this load level, keep this state to continue operation more than 10 days, enter the Load lifting stage of back;
To intake the COD volumetric loading from 3.5kg/m
3.d progressively bring up to the final operating load of reactor design, in water inlet, add external source propionic acid concentration 1.10mmol/L, in anaerobic reactor, replenish nickelous chloride (NiCl simultaneously in this stage
2) guarantee the nickel ion (Ni of mixed solution in the reactor
2+) concentration reaches between 0.08～0.30mg/L; The final operating load of reactor and water outlet COD clearance are stable to reach design requirements when the COD volumetric loading reaches, can think that anaerobic reactor finally reaches steady running, keep this state to continue steady running after 15 days, stop at into and add external source propionic acid and nickel ion in the water, anaerobic sludge domestication end of processing, anaerobic reactor is in normal operating condition and moves continuously.
Xun Hua anaerobic sludge improves (Fig. 1, Fig. 2) greatly to the tolerance and the degradation capability of propionic acid in this way, and whole anaerobic reactor obviously increases (Fig. 3) in the stability that the reply influent load impacts and processing condition fluctuate.
Claims (1)
1, a kind of method that improves operation stability of anaerobic reactor comprises:
1) in anaerobic reactor, presses 0.5KgMLVSS/m
3Dosage inoculation anaerobic reactor excess sludge or according to 0.8KgMLVSS/m
3Dosage inoculation city domestic sewage treatment plant through the excess sludge of Anaerobic Digestion), control enters the volumetric loading of chemical oxygen demand (COD) (COD) in the anaerobic reactor at 0.5～0.6kg/m
3D, the anaerobic sludge initial stage of carrying out domestication is cultivated, and keeps system stable operation more than 10 days;
2) will intake the COD volumetric loading from 0.6kg/m
3D brings up to 1.5kg/m
3D adds external source propionic acid concentration in this stage and reaches 0.40mmol propionic acid/L waste water, when the COD volumetric loading reaches 1.5kg/m in water inlet
3Steady running is 10 days behind the d;
3) will intake the COD volumetric loading from 1.5kg/m
3D progressively brings up to 3.5kg/m
3D adds external source propionic acid concentration 0.85mmol/L in this stage in water inlet, replenish nickelous chloride (NiCl simultaneously in anaerobic reactor
2) guarantee the nickel ion (Ni of mixed solution in the reactor
2+) concentration reaches between 0.08～0.55mg/L; When the COD volumetric loading reaches 3.5kg/m
3Steady running is 10 days behind the d;
4) will intake the COD volumetric loading from 3.5kg/m
3D progressively brings up to the final operating load of reactor design, at the propionic acid of this stage interpolation 1.10mmol/L in water inlet, replenishes nickelous chloride (NiCl simultaneously in anaerobic reactor
2) guarantee the nickel ion (Ni of mixed solution in the reactor
2+) concentration reaches between 0.08～0.30mg/L;
5) reach the final operating load of reactor and steady running after 15 days when the COD volumetric loading, stop at into and add external source propionic acid and nickel ion in the water, anaerobic sludge domestication end of processing, anaerobic reactor is in normal operating condition and moves continuously.
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|---|---|---|---|
| CNB2005101230302A CN1331779C (en) | 2005-12-14 | 2005-12-14 | Method for improving operation stability of anaerobic reactor |
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| CN1803667A true CN1803667A (en) | 2006-07-19 |
| CN1331779C CN1331779C (en) | 2007-08-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103509826A (en) * | 2013-09-24 | 2014-01-15 | 中国科学院成都生物研究所 | Regulation and control method for methane fermentation process |
| CN111847661A (en) * | 2020-07-09 | 2020-10-30 | 广东省源天工程有限公司 | Activated sludge inoculation and bacterium cultivation method |
| CN113104952A (en) * | 2021-03-23 | 2021-07-13 | 深圳市朗坤生物科技有限公司 | Method for stabilizing COD (chemical oxygen demand) operation of CSTR (continuous stirred tank reactor) anaerobic reactor by using nickel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE451262B (en) * | 1983-08-10 | 1987-09-21 | Purac Ab | SEE ANAEROBIC CLEANING OF WASTE WATER FROM MANUFACTURE OF MECHANICAL OR CHEMICAL MECHANICAL CELLULOSAMASSA |
| JPH0696155B2 (en) * | 1989-08-25 | 1994-11-30 | 日本碍子株式会社 | Method and apparatus for treating organic wastewater by methane fermentation |
| CN1057281C (en) * | 1997-04-26 | 2000-10-11 | 张振家 | High-effect anaerobic treatment device for waste water and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103509826A (en) * | 2013-09-24 | 2014-01-15 | 中国科学院成都生物研究所 | Regulation and control method for methane fermentation process |
| CN103509826B (en) * | 2013-09-24 | 2015-04-15 | 中国科学院成都生物研究所 | Regulation and control method for methane fermentation process |
| CN111847661A (en) * | 2020-07-09 | 2020-10-30 | 广东省源天工程有限公司 | Activated sludge inoculation and bacterium cultivation method |
| CN113104952A (en) * | 2021-03-23 | 2021-07-13 | 深圳市朗坤生物科技有限公司 | Method for stabilizing COD (chemical oxygen demand) operation of CSTR (continuous stirred tank reactor) anaerobic reactor by using nickel |
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