CN104843862A - Process for intensifying anaerobic degradation and transformation of azo dyes based on breath of microbial electrode - Google Patents
Process for intensifying anaerobic degradation and transformation of azo dyes based on breath of microbial electrode Download PDFInfo
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- CN104843862A CN104843862A CN201410856418.2A CN201410856418A CN104843862A CN 104843862 A CN104843862 A CN 104843862A CN 201410856418 A CN201410856418 A CN 201410856418A CN 104843862 A CN104843862 A CN 104843862A
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- azoic dyestuff
- azo dye
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Abstract
The invention discloses a process for intensifying anaerobic degradation and transformation of azo dyes based on breath of a microbial electrode. The process comprises the following steps: putting a microbial electrochemical system in an anaerobic reactor to form a coupling reactor; inoculating anaerobic sludge under the room temperature condition; after adjusting the pH value of the azo dye wastewater, the hydraulic retention time, the inflow COD concentration and the inflow azo dye concentration, filtering the azo dye wastewater and carrying out precipitating; feeding the wastewater to the coupling reactor by the action of a peristaltic pump; while decoloring being obvious after initial degradation by the anaerobic reactor in the coupling reactor, treating the wastewater by the microbial electrochemical system; and finally discharging the azo dye wastewater through a secondary sedimentation tank. The key point of the invention lies in that an efficient anaerobic reactor for intensifying biodegradation of the azo dyes based on breath of the microbial electrode is constructed;the addition of chemical agents is reduced; the consumption of electric energy is reduced; and the electric energy is recovered while the pollutants are degraded, so that the cost for treating the azo dye wastewater is effectively lowered.
Description
Technical field:
The invention belongs to azo dye wastewater degraded field, be specifically related to a kind of technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode.
Background technology:
Color degree of dyeing waste water containing azoic dyestuff is large, turbidity large, and organic concentration is high, and water-quality constituents is complicated, is directly discharged into the minimizing of dissolved oxygen in the transmission and water body that can affect light in water body and affects hydrobiological normal existence and growth.In addition, molecule stable is caused to be difficult to be utilized degraded by microorganism because there is N=N double bond in molecular structure of azo dyes, and the primary metabolite of its catabolism is that aromatic amine etc. has genotoxic potential and carinogenicity, to hydrobiont, ecotope even human body have great harm.How a historical difficult problem is become to the Azo dye decol detoxification in waste water from dyestuff.
Traditional physico-chemical process or energy consumption is high, medicine consumption is large, or the interference that secondary pollution is large, post-processed difficulty greatly, is easily subject to complicated ingredient, and the biological treatment of routine is because the cycle of startup is long, percent of decolourization is low, makes treatment effect unsatisfactory.But the bioremediation of routine is obvious for easily biodegradable organics treatment effect, and energy consumption is low.
Summary of the invention:
The object of this invention is to provide a kind of technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode.
Technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode of the present invention, is characterized in that, comprise the following steps:
Microorganism electrochemical system is placed in anaerobic reactor and forms coupled reactor, then anaerobic sludge is inoculated at ambient temperature, regulate the adjust ph of azo dye wastewater, hydraulic detention time, after inlet COD concentration and water inlet azoic dyestuff concentration, azo dye wastewater is successively through filtering, precipitation, coupled reactor is entered by peristaltic pump effect, in coupled reactor, azo dye wastewater is obvious by anaerobic reactor initial breakdown rear decoloring, and make aerogenesis and electricity generation process reach balance by the process of microorganism electrochemical system simultaneously, thus improve bleaching level and the degradation rate of azo dye wastewater, last azo dye wastewater is discharged through second pond.
Described pH value is preferably 7 ~ 8, and described hydraulic detention time is preferably 1 ~ 3d, and described inlet COD concentration is preferably 500 ~ 1000mg/L, and described water inlet azoic dyestuff concentration is preferably 200 ~ 800mg/L.
Described microorganism electrochemical system, is preferably microbiological fuel cell.
Microorganism in described microbiological fuel cell is anerobe, anerobe is mainly divided into the electrochemical activity flora that can promote the flora of biofilm formation He have the special construction such as nm-class conducting wire, electron shuttle body, comprise Zoogloea, Bacillaceae, acinetobacter etc.
Described anaerobic reactor, is preferably anaerobic baffled reactor (ABR).
Described room temperature condition, preferably not higher than 35 DEG C.
Described filtration, preferably filters with screen cloth.Screen cloth can play the effect of preliminary sedimentation tank.
Described screen cloth, its eye diameter is preferably less than 4mm, more preferably 0.15 ~ 1.0mm.
In preferred azo dye wastewater, mud is discharged finally by sludge thickener.
Described peristaltic pump is a kind of power set be pumped into by waste water in coupled reactor.
Described second pond, suspended substance more in effluent quality, the water outlet of precipitation coupled reactor is mainly stablized in its effect.
The technique transformed based on microorganism electrode breathing strengthening azoic dyestuff anaerobic degradation of the present invention is coupled with emerging microbiological fuel cell at the bioremediation of routine, artificial domestication and enrichment electrogenesis bacterium, microorganism electrode is breathed carry out in the reactor with azoic dyestuff synchronized with breath, the efficient catalyzed degradation azoic dyestuff such as the active oxygen produced by biological-cathode, reaches the decolouring detoxification of strengthening azoic dyestuff and electric recoverable object simultaneously.
Azo dye wastewater is carried out anaerobic degradation by the present invention fully, make wherein easily biodegradable organics can be fermented bacterium to make full use of and carry out fermentation hydrolysis and become small molecular organic acid, under the effect of electrogenesis microorganism, produce a large amount of protons and electronics simultaneously, electronics is transmitted by microorganism and arrives anode and arrive negative electrode through external circuit, proton then to movable cathode, thus forms loop line formation electric current.Meanwhile, can produce a large amount of active oxygen atoms etc. have the group of high-efficiency catalytic activity biological-cathode one section, be that electron acceptor(EA) carries out the fracture of azo bond thus reaches the object of decolouring like this with azoic dyestuff.ABR (anaerobic baffled reactor) is the high efficiency reactor processing high concentrated organic wastewater in traditional reactor, fluidised form technology is applied in reactor by it, hydraulics is good, biosolids interception capacity is strong, sludge yield is low, microorganism population distributing is reasonable, structure is simple, start the outstanding advantages such as very fast, can reach the object of the preliminary decolored degradation of azo dye wastewater.MFC (microbiological fuel cell) is a kind of emerging bioelectrochemical system, can enrichment electrogenesis microorganism by artificially adding electrode, thus is breathed by microorganism electrode and be incorporated in reactor, thus the biological degradation of strengthening azoic dyestuff.
A technical essential of the present invention is to utilize ABR reactor azo dyes waste water to carry out preliminary anaerobic degradation.Azo dye wastewater, after overregulating the pre-treatments such as pH, hydraulic detention time, inlet COD concentration, water inlet azoic dyestuff concentration, filtration, precipitation, enters ABR reactor.ABR reactor at room temperature carries out, and does not need manual control temperature, saves the consumption of electric energy.In ABR reactor, the easily biodegradable organics in azo dye wastewater obtains initial breakdown under anaerobic environment, and COD clearance is higher, and chroma in waste water has clear improvement simultaneously.
Another technical essential of the present invention is decolouring and the detoxification of on the basis of above-mentioned anaerobic degradation, being breathed strengthening azoic dyestuff by electrogenesis microorganism electrode.In ABR reactor, the degraded of the multiple electron donor such as easily biodegradable organics provides electronics and the proton of enormous amount to system, the electrogenesis microorganism of enrichment on electrode can utilize the electron transmission paths such as electron shuttle body by electron transmission to external circuit by cellular respiration, simultaneously proton displacement thus form loop line and form electric current.On the other hand, breathed by electrode in this process in the electrogenesis microorganism of negative electrode attachment and can produce the materials such as the active oxygen in a large number with catalytic activity, can the fracture of catalysis azo bond, and strengthen the degraded of its meta-bolites as aromatic amine, thus realize the degradable of azoic dyestuff.
Key of the present invention is that constructing one is conducive to the high efficiency anaerobic reactor that the biodegradable microorganism electrode of azoic dyestuff breathes strengthening, reduce adding of chemical agent, reduce the consumption of electric energy, while degradation of contaminant, carry out the recovery of electric energy, thus effectively reduce the cost of azo dye wastewater process.
The present invention can be used for decolouring and the enhancing degradation process of azo dye wastewater, also can be used for the degraded of other hardly degraded organic substances.
Accompanying drawing illustrates:
Fig. 1 is coupled reactor structure iron of the present invention;
Fig. 2 is process flow sheet of the present invention;
Fig. 3 is Inlet and outlet water azoic dyestuff (AO7) change in concentration situation in coupled reactor operational process;
Fig. 4 is Inlet and outlet water AO7 clearance changing conditions in coupled reactor operational process;
Fig. 5 is Inlet and outlet water COD change in concentration situation in coupled reactor operational process;
Fig. 6 is Inlet and outlet water COD clearance changing conditions (comparing with control group) in coupled reactor operational process.
Embodiment:
Following examples further illustrate of the present invention, instead of limitation of the present invention.
Embodiment 1:
Manually to prepare nutritive medium as water inlet, 1L water inlet nutrient composition is:
0.393g CH3COONa, 0.407g NH4Cl, 0.600g Na2HPO4,0.300gKH2PO4,0.500g NaCl, 0.100g MgSO47H2O, 0.015g CaCl27H2O, azoic dyestuff is orange beta-naphthol (acid orange 7).
In first 27 days, in water inlet, acid orange 7 concentration is 200mg/L.
Microorganism electrochemical system is placed in anaerobic reactor and forms coupled reactor, as shown in Figure 1.
Then under room temperature is not higher than 35 DEG C of conditions, anaerobic sludge is inoculated, adjust ph 7 ~ 8, hydraulic detention time 1 ~ 3d, concentration 200 ~ the 800mg/L of water inlet azoic dyestuff, inlet COD concentration is after 500 ~ 800mg/L, azo dye wastewater successively through eye diameter be the screen filtration of 0.15mm, precipitate in first heavy equalizing tank, coupled reactor is entered (in the present embodiment by peristaltic pump effect, first three compartment of coupled reactor is as process compartment, rear three compartments do not utilize temporarily), in coupled reactor, azo dye wastewater is obvious by anaerobic reactor initial breakdown rear decoloring, simultaneously through the process of microorganism electrochemical system, aerogenesis and electricity generation process is made to reach balance, thus improve bleaching level and the degradation rate of azo dye wastewater, in coupled reactor, enter second pond after anaerobic degradation transforms be excluded, the mud in azoic dyestuff is discharged (as shown in Figure 2) after entering sludge thickener.Setup Experiments three repetition, and be provided with control group, just process with ABR reactor in control group.
In Inlet and outlet water, the result of azoic dyestuff (AO7) change in concentration, AO7 clearance, Inlet and outlet water COD concentration, COD clearance is respectively as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6.
When in intaking, azoic dyestuff concentration is 200mg/L, after the art breading of the present embodiment, reactor percent of decolourization reaches more than 90%, maximumly reaches 95%, and meanwhile, in water outlet, azoic dyestuff concentration is lower than 5mg/L.Below effluent COD concentration 300mg/L, clearance is 50-70%, is approximately higher than 10% compared with control group.
Embodiment 2:
Using human configuration nutritive medium as water inlet, method is identical with embodiment 1.
Within 28-60 days, water inlet acid orange 7 concentration is 400mg/L.
Microorganism electrochemical system is placed in anaerobic reactor and forms coupled reactor, as shown in Figure 1.
Then under room temperature is not higher than 35 DEG C of conditions, anaerobic sludge is inoculated, adjust ph 7 ~ 8, hydraulic detention time 1 ~ 3d, the concentration 200 ~ 800mg/L of water inlet azoic dyestuff, inlet COD concentration are after 700 ~ 1000mg/L, azo dye wastewater successively through eye diameter be 1.0mm screen filtration, precipitate in first heavy equalizing tank, enter coupled reactor by peristaltic pump effect, in coupled reactor, azo dye wastewater is obvious by anaerobic reactor initial breakdown rear decoloring; Simultaneously through the process of microorganism electrochemical system, make aerogenesis and electricity generation process reach balance, thus improve bleaching level and the degradation rate of azo dye wastewater; In coupled reactor, enter second pond after anaerobic degradation transforms be excluded, the mud in azoic dyestuff is discharged (as shown in Figure 2) after entering sludge thickener.Setup Experiments three repetition, and be provided with control group, just process with ABR reactor in control group.
In Inlet and outlet water, the result of azoic dyestuff (AO7) change in concentration, AO7 clearance, Inlet and outlet water COD concentration, COD clearance is respectively as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6.
After the art breading of the present embodiment, reactor water outlet von Muller's indicator concentration is reduced to below 25mg/L, percent of decolourization about 95%.Meanwhile, in water outlet, COD clearance is about 50%, a little more than control group.
Claims (10)
1. breathe the technique of strengthening azoic dyestuff anaerobic degradation conversion based on microorganism electrode for one kind, it is characterized in that, microorganism electrochemical system is placed in anaerobic reactor and forms coupled reactor, then anaerobic sludge is inoculated at ambient temperature, regulate azo dye wastewater pH value, hydraulic detention time, after inlet COD concentration and water inlet azoic dyestuff concentration, azo dye wastewater is successively through filtering, precipitation, coupled reactor is entered by peristaltic pump effect, in coupled reactor, azo dye wastewater is obvious by anaerobic reactor initial breakdown rear decoloring, and simultaneously by the process of microorganism electrochemical system, aerogenesis and electricity generation process is made to reach balance, thus improve bleaching level and the degradation rate of azo dye wastewater, last azo dye wastewater is discharged through second pond.
2. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 1, it is characterized in that, described pH value is 7 ~ 8, described hydraulic detention time is 1 ~ 3d, described inlet COD concentration is 500 ~ 1000mg/L, and described water inlet azoic dyestuff concentration is 200 ~ 800mg/L.
3. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 1, it is characterized in that, described microorganism electrochemical system is microbiological fuel cell.
4. according to claim 3ly breathe based on microorganism electrode the technique that strengthening azoic dyestuff anaerobic degradation transforms, it is characterized in that, described microbiological fuel cell, its microorganism be Zoogloea, Bacillaceae, acinetobacter anerobe.
5. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 1, it is characterized in that, described anaerobic reactor is anaerobic baffled reactor.
6. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 1, it is characterized in that, described room temperature condition is not higher than 35 DEG C.
7. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 1, it is characterized in that, described being filtered into is filtered with screen cloth.
8. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 7, it is characterized in that, described screen cloth, its eye diameter is less than 4mm.
9. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 8, it is characterized in that, described screen cloth, its eye diameter is 0.15 ~ 1.0mm.
10. technique of breathing the conversion of strengthening azoic dyestuff anaerobic degradation based on microorganism electrode according to claim 1, it is characterized in that, in azo dye wastewater, mud is discharged finally by sludge thickener.
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| CN108003862A (en) * | 2017-11-28 | 2018-05-08 | 广东省微生物研究所（广东省微生物分析检测中心） | A kind of core-shell type nano silica fluorescent probe and its synthetic method and application |
| CN109574215A (en) * | 2018-12-16 | 2019-04-05 | 北京工业大学 | A kind of method that single chamber bioelectrochemical system that electroactive microorganism is leading strengthens azo dyes removal |
| CN111530413A (en) * | 2020-04-15 | 2020-08-14 | 广东省微生物研究所（广东省微生物分析检测中心） | Biochar for enhancing soil self-repair and preparation method and application thereof |
| CN112010420A (en) * | 2020-08-11 | 2020-12-01 | 盐城工学院 | Electrochemical biological accelerated treatment reaction device for azo dye wastewater |
| CN112250246A (en) * | 2020-08-27 | 2021-01-22 | 盐城工学院 | Intelligent azo dye wastewater detoxification and advanced treatment method |
| CN112250166A (en) * | 2020-08-27 | 2021-01-22 | 盐城工学院 | Printing and dyeing wastewater efficient detoxification gradient treatment method based on intelligent SBR electrode process |
| CN114671517A (en) * | 2022-04-26 | 2022-06-28 | 交大碳为工程咨询(江苏)有限公司 | Membrane-free anaerobic coupling microbial fuel cell reactor and water treatment method |
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Cited By (12)
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| CN108003862A (en) * | 2017-11-28 | 2018-05-08 | 广东省微生物研究所（广东省微生物分析检测中心） | A kind of core-shell type nano silica fluorescent probe and its synthetic method and application |
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| CN109574215B (en) * | 2018-12-16 | 2022-03-15 | 北京工业大学 | Method for removing azo dye by using single-chamber bioelectrochemical system dominated by electroactive microorganisms |
| CN111530413A (en) * | 2020-04-15 | 2020-08-14 | 广东省微生物研究所（广东省微生物分析检测中心） | Biochar for enhancing soil self-repair and preparation method and application thereof |
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| CN112250246A (en) * | 2020-08-27 | 2021-01-22 | 盐城工学院 | Intelligent azo dye wastewater detoxification and advanced treatment method |
| CN112250166A (en) * | 2020-08-27 | 2021-01-22 | 盐城工学院 | Printing and dyeing wastewater efficient detoxification gradient treatment method based on intelligent SBR electrode process |
| CN112250246B (en) * | 2020-08-27 | 2023-03-21 | 盐城工学院 | Intelligent azo dye wastewater detoxification and advanced treatment method |
| CN114671517A (en) * | 2022-04-26 | 2022-06-28 | 交大碳为工程咨询(江苏)有限公司 | Membrane-free anaerobic coupling microbial fuel cell reactor and water treatment method |
| CN114671517B (en) * | 2022-04-26 | 2022-12-27 | 交大碳为工程咨询(江苏)有限公司 | Membrane-free anaerobic coupling microbial fuel cell reactor and water treatment method |
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