CN102786330A - System for accelerating anaerobic composting of dewatered sludge by bioelectricity production - Google Patents
System for accelerating anaerobic composting of dewatered sludge by bioelectricity production Download PDFInfo
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- CN102786330A CN102786330A CN2012103052403A CN201210305240A CN102786330A CN 102786330 A CN102786330 A CN 102786330A CN 2012103052403 A CN2012103052403 A CN 2012103052403A CN 201210305240 A CN201210305240 A CN 201210305240A CN 102786330 A CN102786330 A CN 102786330A
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- dewatered sludge
- anolyte compartment
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- anode chamber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention discloses a system for accelerating anaerobic composting of dewatered sludge by bioelectricity production and relates to the system for anaerobic composting of the dewatered sludge. According to the system, the problem of relatively long treatment period of the existing sludge in an anaerobic composting procedure is solved. An anode chamber is in a cylindrical shape; an exhaust port is arranged on the upper end face of the anode chamber; two sampling openings are arranged on the lateral wall of the anode chamber; a cathode chamber is in a cuboid shape; a liquid inlet is arranged on the upper end face of the cathode chamber; a liquid outlet is arranged on the lateral wall of the cathode chamber; the anode chamber and the cathode chamber are separated by a proton exchange membrane; graphite brush electrodes are arranged in the centers of the anode chamber and the cathode chamber; two graphite brush electrodes are connected by a copper lead to form a closed circuit; the circuit is externally connected with a resistor; an Ag or AgCl electrode is inserted into the anode chamber through a rubber plug; the dewatered sludge is arranged inside the anode chamber; electrolyte is contained inside the cathode chamber; the exhaust port of the anode chamber is communicated with a gas collecting bottle through a silicon tube, and the gas collecting bottle is communicated with a measuring cylinder through an acid gas absorption bottle. The system is used for accelerating anaerobic composting of the dewatered sludge and achieving synchronized electricity production.
Description
Technical field
The present invention relates to a kind of system of dewatered sludge anaerobic composting.
Background technology
In China, municipal effluent adopts activated sludge process to handle mostly, and a large amount of excess sludges that wherein produce generally transport after concentrated, processed in factory and carry out disposal such as landfill, burning, compost outside the factory.With data by MoM and MEI, compost treatment not only can reach the purpose of sludge stabilizing, can realize the recycling of mud simultaneously.According to the microbial growth environment, compost can be divided into aerobic compost and anaerobic composting.Aerobic compost needs strict control blast volume, and energy consumption and running cost are higher, strict to the requirement of mechanised equipment; And the anaerobic composting energy consumption low, simple to operate, be easy to control, its applications progressively comes into one's own, but the problem that its is grown in cycle need effectively be solved.Biological electrogenesis can accelerate sludge the anaerobic degradation process, and when handling mud, reclaim electric energy.Mud organism anaerobic digestion in the anaerobic composting treating processes generates a large amount of simple compounds, and like saccharide compound, nucleoprotein, phosphatide etc., these simple compounds have been proved and can have directly been utilized by the electrogenesis bacterium.
Summary of the invention
The purpose of this invention is to provide a kind of biological electrogenesis and quicken the system of dewatered sludge anaerobic composting, to solve existing mud long problem of cycle in the anaerobic composting treating processes.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: said system comprises anolyte compartment, cathode compartment, PEM, Ag/AgCl electrode, rubber plug, silicone tube, air collector, acid gas absorption bottle, graduated cylinder and two black lead brush electrodes; The anolyte compartment is the cylinder bodily form; The upper surface of anolyte compartment has venting port; The sidewall of anolyte compartment has two thief holes, and cathode compartment is a cuboid, and the upper surface of cathode compartment has fluid inlet; Have a leakage fluid dram on the sidewall of cathode compartment, anolyte compartment and cathode compartment are separated by PEM;
Anolyte compartment and cathode compartment central position all are provided with the black lead brush electrode, are connected to form closed circuit with copper conductor between two black lead brush electrodes, this circuit outer meeting resistance, and Ag or AgCl electrode are inserted in the anolyte compartment through rubber plug;
Dewatered sludge is housed in the anolyte compartment, electrolytic solution is housed in the cathode compartment, the venting port of anolyte compartment is communicated with air collector through silicone tube, and air collector is communicated with graduated cylinder through the acid gas absorption bottle.
The present invention has following beneficial effect: 1. the present invention does not have devices such as air blast, temperature control, need not turning, and energy consumption is low, operation is simple, practice thrift manpower, be easy to management, has great meliority economically.
2. the present invention can promote compost maturity, shorten the compost cycle, thereby has improved the treatment capacity of dewatered sludge.
3. the present invention has realized biological electrogenesis synchronously, and part biological mass-energy in the dewatered sludge is reclaimed with cleaning electric energy form.
4. process object of the present invention is a dewatered sludge, is a kind of dry process technology of municipal sludge, compares with handling excess sludge, and TS brings up to 20% by 2% in the process object, and reactor volume is corresponding to reduce 90%, saves facility investment and land seizure.
5. microbiological fuel cell type anaerobic composting provided by the invention system is suitable for multiple different material, is widely used.
6. microbiological fuel cell type anaerobic composting system architecture provided by the invention is simple, perfect in shape and function, is easy to realize.
Description of drawings
Fig. 1 is the sectional side elevation of anolyte compartment and cathode compartment in the anaerobic composting of the present invention system, and Fig. 2 is the vertical view of Fig. 1, and Fig. 3 is the left view of Fig. 1, and Fig. 4 is an anaerobic composting entire system structural representation of the present invention.
Embodiment
Embodiment one: combine Fig. 1-Fig. 4 that this embodiment is described; The system of this embodiment comprises anolyte compartment 15, cathode compartment 16, PEM 17, Ag/AgCl electrode 2, rubber plug 7, silicone tube 10, air collector 11, acid gas absorption bottle 12, graduated cylinder 13 and two black lead brush electrodes 1; Anolyte compartment 15 is the cylinder bodily form, and the upper surface of anolyte compartment 15 has venting port 4, and the sidewall of anolyte compartment 15 has two thief holes 3; Cathode compartment 16 is a cuboid; The upper surface of cathode compartment 16 has fluid inlet 5, has a leakage fluid dram 6 on the sidewall of cathode compartment 16, and anolyte compartment 15 is separated by PEM 17 with cathode compartment 16;
In the anolyte compartment 15 dewatered sludge is housed, in the cathode compartment 16 electrolytic solution is housed, the venting port 14 of anolyte compartment 15 is communicated with air collector 11 through silicone tube 10, and air collector 11 is communicated with graduated cylinder 13 through acid gas absorption bottle 12.
Be provided with data trap 9 in the anolyte compartment 15, it is K that electrolytic solution is housed in the cathode compartment 16
3[Fe (CN)
6] and KH
2PO
4Mixed solution; When the advantage of this mixed solution is to use common carbon material as electrode; The hexacyanoferrate has stability preferably, and overpotential is lower, and the negative electrode WV is near its open circuit voltage; Less to system's electricity generation performance influence, can guarantee that the change of system performance mainly is derived from the variation of anode substrate characteristic.
The present invention is based on microbiological fuel cell (Microbial fuel cell; MFC) and sludge anaerobic compost (Anaerobic composting; AnC) system characteristic; The electrode microbiological fuel cell type anaerobic composting system (MFC-AnC) that introduced biological electrogenesis technique construction is set in AnC, and the accelerate sludge anaerobic degradation realizes that simultaneously electric energy reclaims.With the dewatered sludge be compost substrate, the Tripotassium iron hexacyanide be behind the MFC-AnC compost 21d of catholyte in the mud TOC clearance reach 20.6%, the aerobic compost clearance of being reported in this and the document is suitable; MFC-AnC can directly utilize dewatered sludge to be the fuel electrogenesis, and its open circuit voltage can reach 0.84V, and maximum power density is 5.3W/m
3, the reactor drum internal resistance is 98 Ω; Increase moisture percentage in sewage sludge and can significantly reduce the MFC-AnC internal resistance; Raising system electricity generation performance; Therefore utilize the MFC-AnC system to dewatered sludge carry out anaerobic composting can relax sludge dewatering after water ratio must reduce to the restriction 80% below, thereby the energy consumption of saving dehydration; The interpolation of changing food waste can improve the dewatered sludge degradation characteristic, promotes anaerobic composting to carry out smoothly, so the dewatered sludge that the MFC-AnC system can accept to be mixed with a certain amount of changing food waste is a raw material.The present invention introduces the sludge composting system with biological electrogenesis technology first; This has improved the processing power of anaerobic composting system greatly, shortens the compost cycle, because the present invention does not have devices such as air blast, temperature control; Need not turning; Energy consumption is low, be easy to management, has great meliority economically, make it more appropriate to the practical application that dewatered sludge is handled.
Embodiment two: combine Fig. 4 that this embodiment is described, the said system of this embodiment also comprises glass wool layer 14, and anolyte compartment 15 is provided with glass wool layer 14 with cathode compartment 16 outsides, and this structure is kept heap temperature.Other embodiment is identical with embodiment one.
Embodiment three: made up the MFC-AnC reactor drum of processing by synthetic glass.Reactor drum mainly is made up of anolyte compartment, cathode compartment and PEM.Anolyte compartment 15 is cylinder type, and scale is Φ 80mm * 80mm, and useful volume 380mL is at the thief hole of respectively establishing 1 Φ 12mm apart from the upper and lower surperficial 26mm of reactor drum place; Cathode compartment 16 is rectangular build, is of a size of 40mm * 50mm * 80mm, useful volume 150mL; Two Room are by PEM (Nafion 117CS, Dupont company produces) separation.Anolyte compartment 15 and cathode compartment 16 central positions are provided with the black lead brush electrode 1 that titanium metal silk and graphite fibre are processed.(+0.195V vs. standard hydrogen electrode, SHE) as reference electrode, negative electrode is selected K for use to insert Ag/AgCl electrode 2 in the anolyte compartment 15
3[Fe (CN)
6] (electron acceptor(EA), 32.9g/L) and KH
2PO
4Mixed solution (27.2g/L) is as electrolytic solution.The external circuit load is 1000 Ω.Carry out for guarantee anaerobic composting successful reaction, reactor drum outer wrap glass wool layer is to keep heap temperature.
Test used mud and take from the dewatered sludge of certain sewage work's belt filter press.The unloading phase; The mixed solution of dewatered sludge and excess sludge is dropped in anode chamber 15; And adding adequate nutrition liquid and metallic element to cultivate the electron transport bacterium, the inoculation of MFC-AnC is accomplished through periodic replacement anode inoculum and catholyte, catholyte of every 7d replacing; 3d changes an anode substrate and progressively strengthens the ratio of dewatered sludge, only adds dewatered sludge during to last the cultivation.Test used changing food waste and take from school teaching and administrative staff dining room, staple is vegetables, wheaten food, meat etc., is crushed to 1-2mm with the food kibbler behind the decantation moisture.Experiment and analyzing and testing are all at room temperature (24 ± 3 ℃) and standard atmospheric pressure (1.013 * 10
5Pa) carry out under.
The gas that composting process produces in the anolyte compartment 15 imports the air collector 11 and the inner Ca (OH) of filling that 3%NaOH solution is housed through silicone tube 10
2With the acid gas absorption bottle 12 of industrial silicone, isopyknic water is pressed into graduated cylinder 13 simultaneously.
(12bit A/D conversion chips, US) every separated 1min online record output voltage and anode potential use reometer (range 0-2mA) that magnitude of voltage is proofreaied and correct to the voltage of MFC-AnC simultaneously through the multichannel voltage collector.Power density P (Wm
-3)=UI/V
a, wherein U is voltage (V), I is electric current (A), V
aBe anode useful volume (m
3).The absolute value that cathode potential utilizes full voltage to deduct anode potential obtains.When treating system's output voltage stabilization,, respectively output voltage and anode potential are measured, obtained polarization curve through changing external resistance.The internal resistance of MFC-AnC obtains U=E-IR by the battery polarization curve
Int, wherein E is electromotive force (V), R
IntBe the internal resistance of cell (Ω).This experiment is regarded as anode potential during greater than-0.2V the electrogenesis end cycle.
MFC-AnC voltage after 3 weeks cultivated rises to more than the 0.6V; And stable, designation system starts, and drops into fresh dewatered sludge to MFC-AnC anode compost chamber subsequently; Move 21d continuously; Take out the equivalent samples from two thief holes up and down at regular intervals in the experimentation, after mixing, measure relevant physical and chemical parameter.
Result of implementation shows; When advancing the mud organic matter and be 53.6%; Behind the anaerobic composting 21d among the MFC-AnC dewatered sludge TOC clearance reach 20.6%; The aerobic compost clearance of being reported in this and the document is suitable, and biological electrogenesis technology is introduced the sludge anaerobic compositing system can the organic degraded of accelerate sludge; MFC-AnC can directly utilize dewatered sludge for the fuel electrogenesis, with K
3[Fe (CN)
6] for the MFC-AnC open circuit voltage of catholyte can reach 0.84V, maximum power density is 5.3W/m
3, the reactor drum internal resistance is 98 Ω; Increase moisture percentage in sewage sludge and can significantly reduce the MFC-AnC internal resistance; Raising system electricity generation performance; Therefore utilize the MFC-AnC system to dewatered sludge carry out anaerobic composting can relax sludge dewatering after water ratio must reduce to the restriction 80% below, thereby the energy consumption in the saving dehydration; The interpolation of changing food waste can improve the dewatered sludge degradation characteristic, promotes anaerobic composting to carry out smoothly, improves the degradation rate of mud, shortens the whole compost cycle, so the dewatered sludge that the MFC-AnC system can accept to be mixed with a certain amount of changing food waste is a raw material.
Maximum novelty of the present invention is biological electrogenesis technology is introduced the sludge composting system first, and this has improved the processing power of anaerobic composting system greatly, shortens the compost cycle, make it more appropriate to the practical application that dewatered sludge is handled.
Claims (2)
1. a biological electrogenesis quickens the system of dewatered sludge anaerobic composting; It is characterized in that said system comprises anolyte compartment (15), cathode compartment (16), PEM (17), Ag/AgCl electrode (2), rubber plug (7), silicone tube (10), air collector (11), acid gas absorption bottle (12), graduated cylinder (13) and two black lead brush electrodes (1); Anolyte compartment (15) is the cylinder bodily form; The upper surface of anolyte compartment (15) has venting port (4); The sidewall of anolyte compartment (15) has two thief holes (3), and cathode compartment (16) is a cuboid, and the upper surface of cathode compartment (16) has fluid inlet (5); Have a leakage fluid dram (6) on the sidewall of cathode compartment (16), anolyte compartment (15) and cathode compartment (16) are separated by PEM (17);
Anolyte compartment (15) and cathode compartment (16) central position all are provided with black lead brush electrode (1), are connected to form closed circuit with copper conductor between two black lead brush electrodes (1), this circuit outer meeting resistance, and Ag or AgCl electrode (2) are inserted in the anolyte compartment (15) through rubber plug (7);
Dewatered sludge is equipped with in (15) in the anolyte compartment, and cathode compartment is equipped with electrolytic solution in (16), and the venting port (4) of anolyte compartment (15) is communicated with air collector (11) through silicone tube (10), and air collector (11) is communicated with graduated cylinder (13) through acid gas absorption bottle (12).
2. quicken the system of dewatered sludge anaerobic composting according to the said biological electrogenesis of claim 1, it is characterized in that said system also comprises glass wool layer (14), anolyte compartment (15) and cathode compartment (16) outside are provided with glass wool layer (14).
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Cited By (6)
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| CN104671863A (en) * | 2015-02-04 | 2015-06-03 | 哈尔滨工业大学 | Bioelectrochemistry auxiliary anaerobic composting device capable of improving putrescibility of dewatered sludge and startup operation method thereof |
| CN105355951A (en) * | 2015-11-03 | 2016-02-24 | 中国科学院过程工程研究所 | Temperature-variable, pressure-variable and atmosphere-adjustable microbial cell and electricity production and electrolysis method thereof |
| CN108817076A (en) * | 2018-06-08 | 2018-11-16 | 广西博世科环保科技股份有限公司 | The method and system of microorganism electrochemical respirator reinforcing remedying oil-polluted soils |
| CN111333438A (en) * | 2020-03-09 | 2020-06-26 | 广州市环境保护工程设计院有限公司 | System and method for treating surplus sludge of urban domestic sewage |
| CN112759442A (en) * | 2021-03-09 | 2021-05-07 | 上海交通大学 | Small-size high viscosity material high temperature aerobic composting device |
| CN113504279A (en) * | 2021-06-11 | 2021-10-15 | 浙江大学 | Multifunctional bioelectrochemical pollutant detection device |
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| CN112759442A (en) * | 2021-03-09 | 2021-05-07 | 上海交通大学 | Small-size high viscosity material high temperature aerobic composting device |
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Application publication date: 20121121 |