CN101935103A - Method for culturing aerobic granular sludge for degrading chlorophenol by using 2,4-dichlorphenoxyacetic acid as substituted carbon source - Google Patents
Method for culturing aerobic granular sludge for degrading chlorophenol by using 2,4-dichlorphenoxyacetic acid as substituted carbon source Download PDFInfo
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Abstract
The invention discloses a method for culturing aerobic granular sludge for degrading chlorophenol by using 2,4-dichlorphenoxyacetic acid as a substituted carbon source. Active sludge or mature or semi-mature aerobic granular sludge is used as seed sludge, and 2,4-dichlorphenoxyacetic acid substituted chlorophenol is used as a carbon source substance for aerobic granule culture. The method comprises the following steps of: performing initial culture of the aerobic granular sludge by using 2,4-D and glucose as carbon sources, and performing further domestication of the aerobic granular sludge by using the 2,4-D as a main carbon source and using chlorophenol as an auxiliary carbon source so as to obtain the aerobic granular sludge with efficient degradability on the chlorophenol and stable structure. The method avoids great consumption of degradable carbon source in a common aerobic granule culture process, saves the carbon source, reduces the risks of contacting toxic and harmful substances, also can treat wastes by wastes, and has good environmental and economic benefits.
Description
The present invention relates to a kind of method for culturing aerobic granular sludge, belong to environment protection and resource comprehensive-water prevention and cure of pollution field with chlorophenol degradation function.
Background technology
Chloro phenol compound has the inhibition toxic action to many microorganisms, is difficult in environment by microbiological degradation, is a class hardly degraded organic substance.Along with the widespread use of this type of material in industry such as agricultural chemicals, medicine, papermaking, sanitas, also produced serious environmental problem.At present, the improvement method of chlorophenol waste water mainly contains physical adsorption, chemical oxidation, photodegradation and biological degradation.Biotechnology is low, simple to operate with cost, and is subjected to extensive concern.In order to improve the tolerance of microorganism P-Chlorophenol, the biofilm reactor of germs collect or apposition growth has generally been adopted in the biological treatment of chlorophenol waste water.Though this class reactor has increased system's toxin immunity load impact ability, adding of filler increased investment and running cost undoubtedly.Can utilize the self aggregation growth of microorganism to form aerobic particle mud and utilize it to handle chlorophenol waste water, be worth further investigation.
Aerobic particle mud is the aggregate that multiple microorganism forms, it with the biological density height, metabolic activity is strong, settleability good, anti-hazardous and noxious substances load impact ability strong and be subjected to home and abroad environment protection researchist's common concern.At present, aerobic particle mud mainly is to obtain by long-term cultivation with laboratory simulation waste water, and waste water generally adopts material that glucose, acetate, ethanol, sucrose etc. utilize by microorganism relatively simply and easily as carbon source.Though the aerobic particle mud that is obtained under this condition is difficult to be applied to the removal of poisonous and harmful specific pollutant, particularly the improvement aspect of chlorophenol waste water demonstrating superperformance aspect the general organism of removal, the denitrogenation dephosphorizing.
For the aerobic particle mud technology is applied in the chlorophenol waste water treatment, some begin one's study aerobic particle mud culture techniques of degrading chlorophenol.Wang etc. (2008) are main carbon source intermittently cultivating in the reactor with 1000mg/l glucose, 50-100mg/l2,4-two chlorophenols (2,4-DCP) cultivate as auxiliary carbon source and obtained degraded 2, the aerobic particle mud of 4-DCP.After Carucci etc. (2009) utilize the 1000mg/l sodium acetate that active sludge is cultivated into granule sludge, utilize again sodium acetate (1000mg/l) and 4-chlorophenol (＜50mg/l) turn out the aerobic grain of degraded 4-chlorophenol for mixed carbon source.The formation of aerobic grain often needs higher organic loading, thereby and higher chlorophenol concentration can influence its gathering growth to microorganisms inhibition murder by poisoning.Therefore after above-mentioned research adopts easy matrix degradation to turn out aerobic particle mud, progressively tame with chlorophenol again, or to utilize chlorophenol and easy matrix degradation be that common carbon source is cultivated aerobic particle mud.Commute degraded organic carbon source consumption is big on the one hand for these cultural methods, and on the other hand, adding for a long time of chlorophenol increased operator and chlorophenol duration of contact and risk.In addition, this mode aerobic grain of turning out is often poor to the processing power that contains multiple chlorophenol waste water and high density chlorophenol waste water.
In view of the deficiency that above-mentioned degrading chlorophenol method for culturing aerobic granular sludge exists, we propose a kind of 2,4 dichlorophenoxyacetic acid that utilizes and (are called for short 2,4-D) the carbon source method of cultivating the aerobic particle mud of degrading chlorophenol as an alternative.2,4-D is one of widely used weedicide in the world.Compare with chlorophenol, 2,4-D toxicity relatively a little less than, microorganism has relatively stronger tolerance and capacity of decomposition to it.Since 2, can produce 2 in the 4-D aerobic biodegradation process, 4-two chlorophenols, so 2, the 4-D degradation bacteria often has the chlorophenol degradation function simultaneously.Utilize 2,4-D is the method that carbon source is cultivated chlorophenol degraded aerobic particle mud, has avoided a large amount of uses of easy degraded carbon source on the one hand, has saved carbon source; On the other hand, can fully utilize that sterilant produces in producing 2,4-D waste water, therefore the treatment of wastes with processes of wastes against one another has good environment and economic benefit.In addition, the aerobic grain Stability Analysis of Structures that this method is turned out, P-Chlorophenol utilizes scope wide, and tolerance is strong, should have important practice significance for promoting the aerobic particle mud technology aspect the chlorophenol waste water treatment.
Summary of the invention
The objective of the invention is to propose a kind of efficient, safe, economic chlorophenol degraded method for culturing aerobic granular sludge.This method is with the more weak relatively organic compound 2 of toxicity, 4-D is as the carbon source material in the chlorophenol degraded aerobic grain culturing process, by the initial-stage culture and the domestication of aerobic grain chlorophenol of aerobic grain, can turn out P-Chlorophenol and have efficient degradation performance, constitutionally stable aerobic particle mud.
The present invention solves the scheme that its technical problem adopts: inoculation kind of a mud in the bio-reactor of cultivating aerobic particle mud, with 2,4-D and glucose are the initial-stage culture that carbon source is carried out aerobic particle mud, then with 2,4-D is that main carbon source, a small amount of chlorophenol are the chlorophenol domestication that auxiliary carbon source carries out aerobic grain, whole process adopts sequence batch ((SBR) operational mode, can obtain the aerobic particle mud that P-Chlorophenol has good degradation function.
The kind mud of inoculation is the aeration tank of sewage work or the active sludge of second pond, or is cultured to the aerobic particle mud of maturation or half ripe state with the carbon source (as glucose, starch, sodium acetate etc.) of easily degrading.Initial sludge seeding amount is controlled at 4-8g MLSS/l in the reactor.
The initial-stage culture of aerobic grain adopts 2, and 4-D and glucose are the mixed-matrix waste water of carbon source, water inlet 2,4-D concentration increases gradually, and glucose concn reduces gradually, and 2, the 4-D concentration range is 50-600mg/l, and glucose concn is 0-1000mg/l, Controlling System volumetric loading 1.5-1.8kgCOD/m
3D, incubation time 20-40 days.
The chlorophenol domestication stage, 4-D was main carbon source with 2, and chlorophenol is an auxiliary carbon source, 2, and the 4-D influent concentration is controlled at 400-600mg/l, and every kind of chlorophenol concentration is controlled at 5-30mg/l, Controlling System volumetric loading 1.2-1.5kgCOD/m
3D, domestication was cultivated 15-30 days.
Whole process adopts sequence batch ((SBR) operational mode, cycle of operation 4-8h, and the 10-30min of wherein intaking, sedimentation 5-15min, draining 10-30min, all the other are aeration time.Aeration intensity 2-3l/min, culture temperature 20-30 ℃
Beneficial effect:
(1) the present invention proposes and utilize relatively more weak compound 2 of microorganism toxicity, 4-D has the aerobic particle mud method of chlorophenol degradation function for substituting the carbon source cultivation, this method has been avoided easily a large amount of uses of degraded carbon source in the general aerobic grain culturing process, save carbon source, reduce the risk that contacts with hazardous and noxious substances, had good environment and economic benefit.
(2) not only the P-Chlorophenol degradation capability is strong to utilize the aerobic particle mud that the inventive method cultivates, and settleability is good, Stability Analysis of Structures.
Description of drawings:
Fig. 1 aerobic particle mud is cultivated reactor
Fig. 2 degrading chlorophenol aerobic grain sem photograph
Fig. 3 aerobic grain is to 2, the degradation characteristic of 4-D and several chlorophenols
Embodiment:
(1) inoculation kind of a mud: will take from the active sludge of sewage work or be cultured to the aerobic particle mud sedimentation of half ripe or maturity state with easy degraded carbon source, abandon supernatant liquor, add fresh inorganic salt nutrient solution, the sky 1-3h that exposes to the sun, make the abundant metabolism of adsorbed organic matter in kind of the mud, sedimentation once more joins thickened sludge in the bio-reactor, and controlling initial sludge seeding amount is 4-8g MLSS/L.
(2) aerobic grain initial-stage culture: with 2,4-D and glucose are the carbon source water distribution, 2, the 4-D concentration range is 50-600mg/l, and glucose concn is 0-1000mg/l, operational process adjustment water inlet 2,4-D concentration increases gradually, and glucose concn reduces gradually, the control volumetric loading 1.5-1.8kgCOD/m of system
3D is according to C: N: P=100: to water distribution in add nutritive elements such as nitrogen, phosphorus at 5: 1, and replenish a certain amount of trace element.Start reactor and adopt the SBR mode to move, cycle of operation 6-8h, the 10-30min of wherein intaking, sedimentation 15min, draining 10-30min, all the other times are aeration time, aeration intensity 2-3l/min, temperature of reaction 20-30 ℃.Culturing process monitoring pollutant removal index and sludge settling index are adjusted the water inlet operating mode when two indexs are relatively stable.Move and will the settling time reduce to 5min after 5-10 days, all the other conditions are constant.Incubation time 20-40 days.
(3) aerobic grain chlorophenol domestication: when the aerobic grain of cultivating can be with 2, after 4-D is sole carbon source steady running, with 2,4-D is main carbon source, pending purpose chlorophenol (one or more) is the auxiliary carbon source water distribution, 2, and 4-D concentration is controlled at 400-600mg/l, every kind of chlorophenol adds concentration and is controlled at 5-30mg/l, Controlling System volumetric loading 1.2-1.5kgCOD/m
3D.Above-mentioned chlorophenol comprises 2-chlorophenol, 4-chlorophenol, 2,4-two chlorophenols, 2,4,5-trichlorophenol, 2,4,6-trichlorophenol, 2,3,4,6-tetra-chloro-phenol and Pentachlorophenol.Start reactor, adopt preface batch mode operation, cycle of operation 4-6h, the 10-30min of wherein intaking, sedimentation 5min, draining 10-30min, all the other times are aeration time.Other operational conditions is the same.Cultivate and to obtain P-Chlorophenol in 15-30 days and have good degradation property, the stable aerobic particle mud of 26S Proteasome Structure and Function.
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples:
Example utilizes 2, and 4-D is that carbon source is cultivated chlorophenol degraded aerobic particle mud
(1) bio-reactor: reactor is made by synthetic glass, high 100cm, internal diameter 8cm, effective volume 5L.The micro porous aeration head that air is installed by reactor bottom central authorities by air pump enters reactor, and liquid and granule sludge move upward in the air-flow driving a reaction device of formation, and water outlet is positioned at the reactor middle part.The water inlet of reactor, aeration, sedimentation and water discharge time are controlled automatically by the time relay.Whole experiment device as shown in Figure 1.
(2) seed sludge: get certain municipal sewage plant's second pond active sludge, sedimentation 30min removes supernatant liquor, adds fresh inorganic salt nutrient solution, and the sky 2h that exposes to the sun removes supernatant liquor behind the sedimentation 30min once more.Mud after concentrating is joined in the reactor.Initial sludge concentration is approximately 5gMLSS/l in the controlling reactor.
(3) initial-stage culture of aerobic particle mud: preparation synthetic waste water, carbon source is by 2, and 4-D and glucose provide jointly, 2,4-D concentration increases gradually, and glucose concn reduces gradually, water inlet 2,4-D/ glucose ratio is respectively 50/600,100/550,200/450,300/350,400/250,500/150,600/0.Other composition is (mg/l): NH in the waste water
4Cl, 500; NaCl, 100; CaCl
2, 10; MgCl
2, 45; FeCl
3, 40; KH
2PO
4, 1350; K
2HPO
4, 1650, trace element.Trace element formula is (g/L): H
3BO
3, 0.05; ZnCl
2, 0.05; CuCl
2, 0.03; MnSO
4H
2O (NH
4)
6, 0.05; Mo
7O
244H
2O, 0.05; AlCl
3, 0.05; CoCl
26H
2O, 0.05; NiCl, 0.05.Reactor is the one-period operation with 6h, comprising: the 10min water inlet, the 220min aeration, 5min is static, the 5min draining.Hydraulic detention time (HRT) is 8h, and volumetric loading is 0.96-1.8KgCOD/ (m
3D), exchange rate is 50%, the about 2l/min of aeration rate, and temperature is a room temperature.The pH of mixed solution in reactor run duration monitoring water inlet, water outlet, the reactor, Inlet and outlet water COD, MLSS, SVI, microscopically is observed the mud growing state, according to circumstances adjusts water inlet COD, pH etc.Turning out after 32 days can be with 2, and 4-D is the aerobic particle mud of sole carbon source.
(4) aerobic grain chlorophenol domestication: after the aerobic particle mud initial-stage culture stage finishes, to contain 2,4-D, 4-chlorophenol (4-CP), 2,4-two chlorophenols (2,4-DCP) with 2,4, (2,4,6-TCP) mixed-matrix waste water is proceeded the domestication cultivation of aerobic particle mud to the 6-trichlorophenol, in the water distribution 2, when 4-D concentration was 350-425mg/l, 4-CP was 4-10mg/l, 2,4-DCP19-26mg/l, 2,4,6-TCP 3.7-10mg/l.Other component is the same in the waste water.Still adopt the SBR operation scheme, each cycle 4-6h, comprising: the 10min water inlet, 5min is static, and the 5min draining is aeration At All Other Times.Other reaction conditions is the same.Through 20 days domestication, obtained the granule sludge that Stability Analysis of Structures and P-Chlorophenol have efficient degradation, it is to 2 in the waste water, and the clearance of 4-D and three kinds of chlorophenols reaches more than 95%.In a cycle of operation, the aerobic grain of cultivation is to 2, and the degradation characteristic of 4-D and three kinds of chlorophenols as shown in Figure 3.Domestication stage particle is keeping good particle form and performance always, and grain diameter is stabilized in 500 ± 50 μ m.Scanning electronic microscope (SEM) observations is found (Fig. 2), and the particle surface main body is fine and close, neat, based on coccus and bacillus, and has a large amount of extracellular polymerics.
Claims (5)
1. one kind is the cultural method that substitutes the degrading chlorophenol aerobic particle mud of carbon source with 2,4 dichlorophenoxyacetic acid, it is characterized in that:
Aerobic particle mud with active sludge or maturation, half ripe state is kind of a mud, with 2, the 4-dichlorphenoxyacetic acid substitutes the carbon source material that chlorophenol is cultivated as aerobic particle mud, at first by 2,4-dichlorphenoxyacetic acid and glucose are the initial-stage culture that carbon source is carried out aerobic particle mud, be that main carbon source, chlorophenol are that auxiliary carbon source is further tamed aerobic particle mud with 2,4 dichlorophenoxyacetic acid again, can obtain P-Chlorophenol and have efficient degradation performance, constitutionally stable aerobic particle mud.
2. according to claim 1ly a kind ofly utilize 2, the 4-dichlorphenoxyacetic acid is the cultural method of the degrading chlorophenol aerobic particle mud of alternative carbon source, it is characterized in that: described active sludge is meant the suspended state active sludge from the municipal sewage plant, the aerobic particle mud of maturation or half ripe state is meant the aerobic particle mud that is cultured to maturation or half ripe state with easy degraded carbon source, and mud initial inoculation amount is 4-8gMLSS/l.
3. according to claim 1ly a kind ofly utilize 2, the 4-dichlorphenoxyacetic acid is the cultural method of the degrading chlorophenol aerobic particle mud of alternative carbon source, it is characterized in that: the initial-stage culture of described aerobic particle mud, be with 2,4-dichlorphenoxyacetic acid and glucose are common carbon source, culturing process control water inlet 2,4-dichlorphenoxyacetic acid concentration progressively increases (being increased to 600mg/l from 50mg/l), glucose concn gradually reduces (reducing to 0mg/l from 1000mg/l), control volumetric loading 1.5-1.8kgCOD/m
3D, incubation time 20-40 days.
4. according to claim 1ly a kind ofly utilize 2, the 4-dichlorphenoxyacetic acid is the cultural method of the degrading chlorophenol aerobic particle mud of alternative carbon source, it is characterized in that: described aerobic grain chlorophenol domestication, be to be main carbon source with 2,4 dichlorophenoxyacetic acid, chlorophenol is an auxiliary carbon source, 2,4-dichlorphenoxyacetic acid influent concentration is controlled at 400-600mg/l, and every kind of chlorophenol concentration is controlled at 5-30mg/l, control volumetric loading 1.2-1.5kgCOD/m
3D, incubation time 15-30 days.
5. according to claim 1ly a kind ofly utilize 2, the 4-dichlorphenoxyacetic acid is the cultural method of the degrading chlorophenol aerobic particle mud of alternative carbon source, it is characterized in that: the cultivation of described aerobic grain and domestication, reactor adopts preface batch mode operation, cycle of operation 4-8h, the 10-30min of wherein intaking, sedimentation 5-15min, draining 10-30min, all the other are aeration time.The about 2-3l/min of aeration intensity, culture temperature 20-30 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880246A (en) * | 2014-03-19 | 2014-06-25 | 北京工业大学 | Method for harmless degradation of PCP (pentachlorophenol) by using ECH (epoxy chloropropane)-SBR (styrene-butadiene rubber) combined process |
| CN104944573A (en) * | 2015-06-24 | 2015-09-30 | 北京工业大学 | Method for domesticating degradable 2-CP activated sludge with glucose as co-substrate |
| CN109502745A (en) * | 2018-12-10 | 2019-03-22 | 北京工业大学 | A method of quickly taming the microorganism of degradable 2,4,6- trichlorophenol |
| CN110240271A (en) * | 2018-04-28 | 2019-09-17 | 华东理工大学 | A kind of starting method for the bioreactor handling phosphoric acid triethyl waste water |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880246A (en) * | 2014-03-19 | 2014-06-25 | 北京工业大学 | Method for harmless degradation of PCP (pentachlorophenol) by using ECH (epoxy chloropropane)-SBR (styrene-butadiene rubber) combined process |
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| CN104944573A (en) * | 2015-06-24 | 2015-09-30 | 北京工业大学 | Method for domesticating degradable 2-CP activated sludge with glucose as co-substrate |
| CN110240271A (en) * | 2018-04-28 | 2019-09-17 | 华东理工大学 | A kind of starting method for the bioreactor handling phosphoric acid triethyl waste water |
| CN110240271B (en) * | 2018-04-28 | 2022-06-17 | 华东理工大学 | Starting method of bioreactor for treating triethyl phosphate-containing wastewater |
| CN109502745A (en) * | 2018-12-10 | 2019-03-22 | 北京工业大学 | A method of quickly taming the microorganism of degradable 2,4,6- trichlorophenol |
| CN109502745B (en) * | 2018-12-10 | 2021-09-14 | 北京工业大学 | Method for rapidly domesticating microorganism capable of degrading 2,4, 6-trichlorophenol |
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Application publication date: 20110105 |