CN103043792B - Method and device for cultivating anaerobic granular sludge - Google Patents
Method and device for cultivating anaerobic granular sludge Download PDFInfo
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Abstract
The invention discloses a device for cultivating anaerobic granular sludge. The device is characterized in that an artificial sludge bed is arranged inside a body and is formed in a manner that a packing support pipe is fixed between an upper support plate and a lower support plate in a penetrating manner; the upper support plate and the lower support plate are fixed together with the body through a lower fixing frame; radial packings are evenly distributed on the pipe wall of the packing support pipe; a plurality of paths of inlet water distributors are arranged at the bottom part of the body and are connected with a water inlet pump; a water outlet pipe is arranged at the upper part of the body; an overflow weir is arranged on the body above the water outlet pipe; an exhaust pipe is arranged on the body above the overflow weir and is connected with an air collector; and a sludge pump connected to the lateral wall of the bottom part of the body is connected with a sludge collecting tank. The invention also provides a method for cultivating the anaerobic granular sludge. A strain cultivated by the device and the device is stable in performance and has a strong capacity of adapting to changes of an external environment, an expansion coefficient of the anaerobic granular sludge bed is high, a cultivation period of the anaerobic granular sludge is short, the cultivation efficiency is high, and the performance of the anaerobic granular sludge is stable.
Description
Technical field
The present invention relates to biological wastewater treatment technology field, is a kind of anaerobic grain sludge cultural method and device thereof.
Technical background
Anaerobic Microbiological Treatment Technology is the best-of-breed technology that organic contamination is administered, and it is compared with materialization treatment technology with chemistry, and treatment effect is good and processing costs is low.In anaerobism wastewater processing technology, granule sludge activity is processed waste water effect to anaerobic reactor considerable influence, anaerobic reactor startup is restricted by anaerobic grain sludge, and therefore turning out well behaved granule sludge is to realize the prerequisite that anaerobic reactor starts fast and efficiently moves.In anaerobic reactor, anaerobic grain sludge forms and is progressively developed by floc sludge, and just adult of granule sludge appears in the initial stage, then occurs granule sludge and then development, and granule sludge quantity is on the increase, and particle diameter constantly increases and is tending towards even.Granule sludge is assembled formation mud bed and is constantly thickened, and has finally formed stable granule sludge bed, and the appearance of granule sludge bed indicates that anaerobic grain sludge cultivation is ripe.In anaerobic reactor operational process, because mud bed expands, keep Activity of Anaerobic Granular Sludges, made anaerobic reactor process waste water efficiency and be improved.China's disclosure of the invention (bulletin) number: CN1887737A discloses " a kind of fast culture process of anaerobic grain sludge ", it can accelerate sarcina methanica accumulation formation anaerobic grain sludge fast by add polyquaternium in anaerobic reactor, the weak point of the method is, need to be to the flocculation agent that adds difficult anaerobic biodegradation in anaerobic reactor, limit biological inoculum type in anaerobic grain sludge, and technical requirements is higher, be not easy to operation.
Summary of the invention
The object of the invention is, overcome the deficiency of prior art, the method of artificial sludge's bed quickly culturing anaerobic granule sludge is set in anaerobic grain sludge culture apparatus, the bacterial classification stable performance that it is turned out, adapt to external environment changing capability strong, the anaerobic granular sludge bed layer coefficient of expansion is high, and anaerobic grain sludge culture cycle is short, culture efficiency is high, anaerobic grain sludge stable performance.And provide rational in infrastructure, convenient operation, wield anaerobic grain sludge culture apparatus.
A kind of anaerobic grain sludge cultural method, is characterized in that: it comprises the following steps:
(1) in anaerobic grain sludge culture apparatus, add seed sludge, and carry high concentrated organic wastewater in anaerobic grain sludge culture apparatus bottom, measuring the initial COD value of organic waste water based on potassium dichromate process in standard GB/T 11914-89 is 3000 ~ 5000mg/L, in anaerobic grain sludge culture apparatus, temperature is at 35 ~ 40 ℃, pH value is 7.0, influent alkalinity 1000mg/L, described seed sludge volume and anaerobic grain sludge culture apparatus volume ratio are 1:15 ~ 1:20;
(2) anaerobic grain sludge culturing process is divided into three phases: sludge acclimatization stage, Granular sludge formation stage and granule sludge stage of maturity, adopt static acclimation to seed sludge domestication in anaerobic grain sludge culture apparatus, it is 20 ~ 25h that hydraulic detention time is set, measure anaerobic grain sludge culture apparatus thief hole COD value, in the time that COD clearance reaches 80% ~ 90%, the domestication stage finishes;
(3) the Granular sludge formation stage is from the water inlet of anaerobic grain sludge culture apparatus bottom, impact mud in anaerobic grain sludge culture apparatus, make mud in anaerobic grain sludge culture apparatus, contact with artificial sludge's bed and assemble on it, shortening hydraulic detention time is 7 ~ 10h, when mensuration anaerobism cultivation granule sludge device water outlet COD clearance reaches 80% ~ 90%, in anaerobism cultivation granule sludge device, Distribution of sludge is on artificial sludge's bed, wherein particle diameter accounts for 75% ~ 85% of mud sum at the mud of 1 ~ 2mm, the Granular sludge formation stage finishes, described artificial sludge's bed volume and anaerobic grain sludge culture apparatus volume ratio are 1:2 ~ 1:2.5,
(4) granule sludge stage of maturity raising influent load is loaded at 25.8 ~ 28.9kg/ (cm COD
2d), hydraulic detention time shortens to 6 ~ 7h, mud constantly accumulation mutually gathering in artificial sludge's bed in anaerobic grain sludge culture apparatus, form macrobead mud, wherein particle diameter accounts for 70% ~ 75% of mud sum at the mud of 4 ~ 5mm, and particle diameter accounts for 15% ~ 20% of mud sum at the mud of 3 ~ 4mm, and the mud of particle diameter below 3mm accounts for 5% ~ 15% of mud sum, measure anaerobic grain sludge culture apparatus water outlet COD clearance 80% ~ 90% time, the Granular sludge formation stage finishes.
The initial COD concentration of organic waste water of described step (1) is 3500mg/L.
The organic waste water of described step (1) is the waste water in its feeding and slaughtering process.
The seed sludge volume of described step (1) and anaerobic grain sludge culture apparatus volume ratio are 1:20.
It is 24h that the domestication stage of described step (2) arranges hydraulic detention time.
In described step (3), Granular sludge formation stage hydraulic detention time is 8h.
In described step (4), COD loads at 27.0kg/ (cm
2d).
In described step (4), granule sludge stage of maturity hydraulic detention time is 6.5h.
A kind of anaerobic grain sludge culture apparatus, it is characterized in that: it comprises body, artificial sludge's bed is set in body, the structure of described artificial sludge's bed is, in the middle of upper backup pad and lower supporting plate, install and be fixed with packing support pipe, upper backup pad is fixed by upper holder and body, lower supporting plate is fixed by lower fixed frame and body, on the tube wall of packing support pipe, be provided with uniform radial filler, be provided with multichannel water inlet divider in the bottom of body, multichannel water inlet divider is connected with intake pump, top at body is provided with rising pipe, on the body being positioned on rising pipe, be provided with overflow weir, on the body being positioned on overflow weir, be provided with vapor pipe, vapor pipe is connected with air collector, the sludge pump connecting on the sidewall of the bottom of body is connected with mud collecting tank.
Described filler is some carbon fibre tows.
Experimental results show that, the anaerobic granular sludge bed rate of expansion that the present invention cultivates is not added the anaerobic granular sludge bed floor height 9% ~ 15% that artificial sludge's bed anaerobic culture device is turned out, in anaerobic grain sludge, methanogen is mainly to produce methane thread fungus, is strict anaerobic bacterium.The anaerobic grain sludge surface porosity porous of cultivating through scanning electron microscopic observation the present invention is convenient to methane and is carried, and compared with common anaerobic grain sludge, methane production is large.The Mature anaerobic granular sludge that the present invention is cultivated is applied in the anaerobic biological reactor of operation, through the test run(s) of half a year, finds that water outlet COD clearance remains on 87% ~ 90%, and anaerobic reactor is stable, does not occur acidifying and intoxicating phenomenon.
The present invention is by artificial sludge's bed, in anaerobic grain sludge culturing process, mud is attached on artificial sludge's bed, has avoided the accumulation of acidication stage acid-producing bacteria in Granular sludge formation process, artificial sludge's bed is uniformly distributed the granule sludge stable performance that makes formation, granule sludge impact resistance is good, adapts to external environment changing capability strong, and granularity is large, mud bed expansion coefficient is high, active high, culture cycle is short, and culture efficiency is high; Anaerobic grain sludge culture apparatus rational in infrastructure, convenient operation, easily grasps, and really makes anaerobic grain sludge cultivate and realizes industrialization, mass-producing, automatization.
Accompanying drawing explanation
Fig. 1 is anaerobic grain sludge culture apparatus structural representation.
In figure: 1 overflow weir, fixed support on 2,3 fillers, 4 vapor pipes, 5 times fixed supports, 6 multichannels water inlet dividers, 7 bodies, 8 intake pumps, 9 mud collecting tanks, 10 sludge pumps, 11 lower supporting plates, 12 packing support pipes, 13 upper backup pads, 14 rising pipes, 15 air collectors.
Embodiment
As shown in Figure 1, anaerobic grain sludge culture apparatus of the present invention comprises body 7, at the interior artificial sludge's bed that arranges of body 7, the structure of described artificial sludge's bed is, in the middle of upper backup pad 13 and lower supporting plate 11, install and be fixed with packing support pipe 12, upper backup pad 13 is fixing with body 7 by upper holder 2, lower supporting plate 11 is fixing with body 7 by lower fixed frame 5, on the tube wall of packing support pipe 12, be provided with uniform radial filler 3, be provided with multichannel water inlet divider 6 in the bottom of body 7, multichannel water inlet divider 6 is connected with intake pump 8, be provided with rising pipe 14 on the top of body 7, on the body 7 being positioned on rising pipe 14, be provided with overflow weir 1, on the body 7 being positioned on overflow weir 1pp, be provided with vapor pipe 4, vapor pipe 4 is connected with air collector, the sludge pump 10 connecting on the sidewall of the bottom of body 7 is connected with mud collecting tank 9.Described filler 3 is some carbon fibre tows 4.
Anaerobic grain sludge culture apparatus is at the interior artificial sludge's of the setting bed of body 7, artificial sludge's bed is to install and be fixed with packing support pipe 12 in the middle of upper backup pad 13 and lower supporting plate 11, upper backup pad 13 is fixing with body 7 by upper holder 2, lower supporting plate 11 is fixing with body 7 by lower fixed frame 5, on the tube wall of packing support pipe 12, be provided with that uniform radial filler 3 forms, be provided with multichannel water inlet divider 6 in the bottom of body 7 and can realize four branch roads simultaneously by injection body 7 uniform water by the intake pump 8 connecting, enough influent loads are guaranteed, in body 7, seed sludge is subject to after water impact in suspended state, be attached on artificial sludge's bed, body 7 bottom sidewalls arrange sludge pump 10 mud are discharged to secondary use in mud collecting tank 9.
As shown in Figure 1, body 7 internal volumes of anaerobic grain sludge culture apparatus of the present invention are 200L, be 10L to adding seed sludge volume in body 7, and carry the high densitys waste water of raising pigs in body 7 bottoms, mensuration is raised pigs the initial COD value of waste water for 3000mg/L, the interior temperature of body 7 is at 35 ℃, and pH value is 7.0, influent alkalinity 1000mg/L.Anaerobic grain sludge Initial stage of culture carries out static state domestication to seed sludge, and in domestication process, it is 20h that hydraulic detention time is set, while taming the 11st day, measure body 7 thief hole water outlet COD values, in the time that body 7 water outlet COD clearances reach 80%, the sludge acclimatization stage finishes; Anaerobic grain sludge formation stages increases hydraulic load, and shortening hydraulic detention time is 7h, and the Granular sludge formation stage, while carrying out the 20th day, is measured body 7 water outlet COD values, and in the time that water outlet COD clearance reaches 80%, methane production is 8.5 mLCH
4(gVSSd)
-1, in body 7, Distribution of sludge is in artificial sludge's bed, and wherein particle diameter accounts for 75% of mud sum at the mud of 1 ~ 2mm, and the Granular sludge formation stage finishes; The granule sludge stage of maturity is improved influent load loads at 25.8kg/ (cm COD
2d), hydraulic detention time shortens to 6h, mud constantly accumulation mutually gathering in artificial sludge's bed in body 7, form macrobead mud, wherein particle diameter accounts for 70% of mud sum at the mud of 4 ~ 5mm, and particle diameter accounts for 15% of mud sum at the mud of 3 ~ 4mm, the mud of particle diameter below 3mm accounts for 15% of mud sum, the Granular sludge formation stage, while carrying out the 25th day, the COD clearance of measuring body 7 rising pipes 14 was 80%, and methane production is 16.7 mLCH
4(gVSSd)
-1, the Granular sludge formation stage finishes.
The anaerobic grain sludge culture apparatus cultivation Mature anaerobic granular sludge of inside establishing artificial sludge's bed needs 56 days altogether, cultured anaerobic grain sludge is added in anaerobic biological reactor, in the time that anaerobic biological reactor moves 2 months, measure anaerobic biological reactor water outlet COD clearance and reach 80%, in anaerobic biological reactor, there is not acidifying and intoxicating phenomenon, normal operation.
As shown in Figure 1, body 7 internal volumes of anaerobic grain sludge culture apparatus of the present invention are 200L, be 10L to adding seed sludge volume in body 7, and carry the high densitys waste water of raising pigs in body 7 bottoms, mensuration is raised pigs the initial COD value of waste water for 4000mg/L, the interior temperature of body 7 is at 35 ℃, and pH value is 7.0, influent alkalinity 1000mg/L.Anaerobic grain sludge Initial stage of culture carries out static state domestication to seed sludge, and in domestication process, it is 24h that hydraulic detention time is set, while taming the 12nd day, measure body 7 thief hole water outlet COD values, in the time that body 7 water outlet COD clearances reach 85%, the sludge acclimatization stage finishes; Anaerobic grain sludge formation stages increases hydraulic load, and shortening hydraulic detention time is 8h, and the Granular sludge formation stage, while carrying out the 23rd day, is measured body 7 and water outlet COD value, and in the time that water outlet COD clearance reaches 85%, methane production is 12.5 mLCH
4(gVSSd)
-1, in body 7, Distribution of sludge is in artificial sludge's bed, and wherein particle diameter accounts for 80% of mud sum at the mud of 1 ~ 2mm, and the Granular sludge formation stage finishes; The granule sludge stage of maturity is improved influent load loads at 27.0kg/ (cm COD
2d), hydraulic detention time shortens to 6.5h, detest mud constantly accumulation mutually gathering in artificial sludge's bed in body 7, form macrobead mud, wherein particle diameter accounts for 70% of mud sum at the mud of 4 ~ 5mm, and particle diameter accounts for 15% of mud sum at the mud of 3 ~ 4mm, the mud of particle diameter below 3mm accounts for 15% of mud sum, the Granular sludge formation stage, while carrying out the 28th day, the water outlet COD clearance of measuring body 7 rising pipes 14 was 85%, and methane production is 21.4 mLCH
4(gVSSd)
-1, the Granular sludge formation stage finishes.
The anaerobic grain sludge culture apparatus cultivation Mature anaerobic granular sludge of inside establishing artificial sludge's bed needs 63 days altogether, cultured anaerobic grain sludge is added in anaerobic biological reactor, in the time that anaerobic biological reactor moves 2.5 months, measure anaerobic biological reactor water outlet COD clearance and reach 85%, in anaerobic biological reactor, there is not acidifying and intoxicating phenomenon, normal operation.
As shown in Figure 1, body 7 volumes of anaerobic grain sludge culture apparatus of the present invention are 200L, be 10L to adding seed sludge volume in body 7, and carry the high density waste water of raising pigs in the bottom of body 7, mensuration is raised pigs the initial COD value of waste water for 5000mg/L, the interior temperature of body 7 is at 35 ℃, and pH value is 7.0, influent alkalinity 1000mg/L.Anaerobic grain sludge Initial stage of culture carries out static state domestication to seed sludge, and in domestication process, it is 25h that hydraulic detention time is set, while taming the 15th day, mensuration is detested body 7 thief hole water outlet COD values, and in the time that body 7 water outlet COD clearances reach 90%, the sludge acclimatization stage finishes; Anaerobic grain sludge formation stages increases hydraulic load, and shortening hydraulic detention time is 10h, and the Granular sludge formation stage, while carrying out the 24th day, is measured the water outlet COD value of body 7, and in the time that water outlet COD clearance reaches 90%, methane production is 15.6 mLCH
4(gVSSd)
-1, in body 7, Distribution of sludge is in artificial sludge's bed, and wherein particle diameter accounts for 85% of mud sum at the mud of 1 ~ 2mm, and the Granular sludge formation stage finishes; The granule sludge stage of maturity is improved influent load loads at 28.9kg/ (cm COD
2d), hydraulic detention time shortens to 10h, mud constantly accumulation mutually gathering in artificial sludge's bed in body 7, form macrobead mud, wherein particle diameter accounts for 75% of mud sum at the mud of 4 ~ 5mm, and particle diameter accounts for 20% of mud sum at the mud of 3 ~ 4mm, the mud of particle diameter below 3mm accounts for 5% of mud sum, the Granular sludge formation stage, while carrying out the 30th day, the COD clearance of measuring body 7 rising pipes 14 was 85%, and methane production is 21.4 mLCH
4(gVSSd)
-1, the Granular sludge formation stage finishes.
The anaerobic grain sludge culture apparatus cultivation Mature anaerobic granular sludge of inside establishing simulation mud bed needs 69 days altogether, cultured anaerobic grain sludge is added in anaerobic biological reactor, in the time that anaerobic biological reactor moves 3 months, measure anaerobic biological reactor water outlet COD clearance and reach 90%, in anaerobic biological reactor, there is not acidifying and intoxicating phenomenon, normal operation.
Claims (7)
1. an anaerobic grain sludge cultural method, is characterized in that, it comprises the following steps:
(1) anaerobic grain sludge culture apparatus is set, described anaerobic grain sludge culture apparatus comprises body, artificial sludge's bed is set in body, the structure of described artificial sludge's bed is, in the middle of upper backup pad and lower supporting plate, install and be fixed with packing support pipe, upper backup pad is fixed by upper holder and body, lower supporting plate is fixed by lower fixed frame and body, on the tube wall of packing support pipe, be provided with uniform radial filler, be provided with multichannel water inlet divider in the bottom of body, multichannel water inlet divider is connected with intake pump, top at body is provided with rising pipe, on the body being positioned on rising pipe, be provided with overflow weir, on the body being positioned on overflow weir, be provided with vapor pipe, vapor pipe is connected with air collector, the sludge pump connecting on the sidewall of the bottom of body is connected with mud collecting tank,
(2) in anaerobic grain sludge culture apparatus, add seed sludge, and carry high concentrated organic wastewater in anaerobic grain sludge culture apparatus bottom, measuring the initial COD value of organic waste water based on potassium dichromate process in standard GB/T 11914-89 is 4000～5000mg/L, in anaerobic grain sludge culture apparatus, temperature is at 35～40 ℃, pH value is 7.0, influent alkalinity 1000mg/L, described seed sludge volume and anaerobic grain sludge culture apparatus volume ratio are 1:15～1:20;
(3) anaerobic grain sludge culturing process is divided into three phases: sludge acclimatization stage, Granular sludge formation stage and granule sludge stage of maturity, adopt static acclimation to seed sludge domestication in anaerobic grain sludge culture apparatus, it is 20～25h that hydraulic detention time is set, measure anaerobic grain sludge culture apparatus thief hole COD value, in the time that COD clearance reaches 80%～90%, the domestication stage finishes;
(4) the Granular sludge formation stage is from the water inlet of anaerobic grain sludge culture apparatus bottom, impact mud in anaerobic grain sludge culture apparatus, make mud in anaerobic grain sludge culture apparatus, contact with artificial sludge's bed and assemble on it, shortening hydraulic detention time is 7～10h, when mensuration anaerobic grain sludge culture apparatus water outlet COD clearance reaches 80%～90%, in anaerobic grain sludge culture apparatus, Distribution of sludge is on artificial sludge's bed, wherein particle diameter accounts for 75%～85% of mud sum at the mud of 1～2mm, the Granular sludge formation stage finishes, described artificial sludge's bed volume and anaerobic grain sludge culture apparatus volume ratio are 1:2～1:2.5,
(5) granule sludge stage of maturity raising influent load is loaded at 25.8～28.9kg/ (cm COD
3d), hydraulic detention time shortens to 6～7h, mud constantly accumulation mutually gathering in artificial sludge's bed in anaerobic grain sludge culture apparatus, form macrobead mud, wherein particle diameter accounts for 70%～75% of mud sum at the mud of 4～5mm, particle diameter accounts for 15%～20% of mud sum at the mud of 3～4mm, the mud of particle diameter below 3mm accounts for 5%～15% of mud sum, measure anaerobic grain sludge culture apparatus water outlet COD clearance 80%～90% time, the granule sludge stage of maturity finishes.
2. a kind of anaerobic grain sludge cultural method according to claim 1, is characterized in that: the organic waste water of described step (2) is slaughterhouse wastewater.
3. a kind of anaerobic grain sludge cultural method according to claim 1, is characterized in that: the seed sludge volume of described step (2) and anaerobic grain sludge culture apparatus volume ratio are 1:20.
4. a kind of anaerobic grain sludge cultural method according to claim 1, is characterized in that: it is 24h that the domestication stage of described step (3) arranges hydraulic detention time.
5. a kind of anaerobic grain sludge cultural method according to claim 1, is characterized in that: in described step (4), Granular sludge formation stage hydraulic detention time is 8h.
6. a kind of anaerobic grain sludge cultural method according to claim 1, is characterized in that: in described step (5), COD loads at 27.0kg/ (cm
3d).
7. a kind of anaerobic grain sludge cultural method according to claim 1, is characterized in that: in described step (5), granule sludge stage of maturity hydraulic detention time is 6.5h.
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| CN106396096A (en) * | 2016-11-04 | 2017-02-15 | 苏州依斯倍环保装备科技有限公司 | Method and device for culturing anaerobic granular sludge |
| CN107619108A (en) * | 2017-09-20 | 2018-01-23 | 苏州科技大学 | Anaerobic grain sludge cultural method and culture apparatus |
| CN107902756B (en) * | 2017-11-21 | 2021-07-13 | 齐鲁工业大学 | Method for accelerating granulation of anaerobic sludge of citric acid wastewater |
| CN108191191A (en) * | 2018-03-17 | 2018-06-22 | 凌建军 | One kind can go here and there slotting pencil filler device for countryside sewage treating |
| CN108238676B (en) * | 2018-03-17 | 2023-10-27 | 凌建军 | AB method unpowered purification device applied to mountain area |
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| CN108892235B (en) * | 2018-08-09 | 2021-07-20 | 南京江岛环境科技研究院有限公司 | Method for improving filler film forming efficiency in water treatment reactor |
| CN108996681B (en) * | 2018-09-30 | 2021-12-07 | 云南天朗环境科技有限公司 | Anaerobic granular sludge and culture method and application thereof |
| CN110550737B (en) * | 2019-08-21 | 2022-04-29 | 万创青绿（北京）环境科技有限公司 | Granular sludge preparation method and reactor |
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| CN1215029A (en) * | 1997-10-21 | 1999-04-28 | 中国石化扬子石油化工公司 | Anaerobic reation pool and method for treating waste water |
| DE102004021022B3 (en) * | 2004-04-27 | 2005-10-06 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Effluent water anaerobic treatment reactor has cylindrical housing with water inlet at base and water outlet just under water surface |
| CN1887737A (en) * | 2006-07-14 | 2007-01-03 | 太原理工大学 | Fast culture process in anaerobic grain sludge |
| JP3911742B2 (en) * | 1996-12-05 | 2007-05-09 | 栗田工業株式会社 | Organic wastewater anaerobic treatment equipment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3911742B2 (en) * | 1996-12-05 | 2007-05-09 | 栗田工業株式会社 | Organic wastewater anaerobic treatment equipment |
| CN1215029A (en) * | 1997-10-21 | 1999-04-28 | 中国石化扬子石油化工公司 | Anaerobic reation pool and method for treating waste water |
| DE102004021022B3 (en) * | 2004-04-27 | 2005-10-06 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Effluent water anaerobic treatment reactor has cylindrical housing with water inlet at base and water outlet just under water surface |
| CN1887737A (en) * | 2006-07-14 | 2007-01-03 | 太原理工大学 | Fast culture process in anaerobic grain sludge |
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