CN101955264A - Method for processing garbage leachate by using microbial fuel cell - Google Patents

Abstract

The invention discloses a method for processing garbage leachate by using a microbial fuel cell, which comprises the following steps of: starting the microbial fuel cell, which is to inject glucose simulating organic waste water into the microbial fuel cell to start the microbial fuel cell by using anaerobic sludge as inoculation liquid, wherein one period is completed when the voltage of the cell is less than 50mV; and 2) after the microbial fuel cell is successfully started, replacing the glucose waste water in an anode chamber with the mixed solution of glucose and garbage leachate, recording the voltage of the cell with a frequency of one point per minute, detecting chemical oxygen demand (COD) every other day and replacing the mixed solution of glucose and garbage leachate when a removal rate of the COD is over 80 percent. The method has the advantages that: the waste water is treated and organic pollutant in the waste water is converted into electric power at the same time; a process is simple, implementation is easy, cost is low, efficiency is high and the like; and treatment effects and electric power yield are hardly influenced, and the removal rate of the COD is high.

Description

A kind of method of utilizing microbiological fuel cell treating refuse percolate

Technical field

The invention belongs to sewage disposal technology, particularly a kind of method of utilizing microbiological fuel cell treating refuse percolate.

Background technology

The domestic waste landfill now is widely used at home and abroad as one of solid waste processing mode, in the process of garbage loading embeading and landfill yard all can be accompanied by the generation of percolate after closing.Percolate is the very strong high concentrated organic wastewater of a kind of pollution.Find after deliberation, chemical oxygen demand (COD) of percolate (COD) and biochemical oxygen demand (BOD) (BOD) value can reach 10～100 times of municipal effluent, and contain multiple toxicant and carcinogenic substance, if not treated direct discharging, with severe contamination underground water, surface water and surrounding environment, therefore must effectively handle it.Existing for many years about the research of refuse leachate treatment technology both at home and abroad, treatment process mainly contains charcoal absorption, chemical precipitation, chemical oxidation, ion-exchange, reverse osmosis, soil processing, biological treatment etc.At present, the investigator has carried out a large amount of research work to the biological degradation of percolate both at home and abroad, and wherein more is to utilize degradation treatment percolates such as activated sludge process, microbial film or anaerobic biofilter.Aerobic biological treatment process is effective in the biological process, but needs large-scale aeration, capital cost and operational and administrative expenses height.Anaerobic biological treatment technology can save floor occupying area and power consumption, but is subject to the influence of envrionment conditions and interfering substance, and treatment effect can descend and the prolongation of the time limit and variation with temperature.Now generally adopt anaerobic-aerobic to handle process combined, the processing efficiency height, but technology is complicated, and do not consider the organic problem of utilizing in the waste water.

Microbiological fuel cell (MFC) is to utilize electrochemical techniques that microbial metabolism can be converted into a kind of device of electric energy, and it can be transformed into electric energy with the organic pollutant in the waste water, and handles waste water simultaneously.The organism of the MFC utilization of research report is mainly the material of easy degraded at present, as glucose, sucrose, acetate, ethanol etc.Because polluting more serious to environment is poisonous and harmful waste water, organic content is abundant in the waste water of these actual discharge, if also can generate electricity when can handle poisonous and harmful waste water with MFC, is the quantum jump in the MFC research.So far the report that does not also have relevant MFC treating refuse percolate both at home and abroad.

Summary of the invention

The objective of the invention is at above-mentioned existing problems, a kind of method of utilizing microbiological fuel cell treating refuse percolate is provided, this method is simple, easy to implement, cost is low and efficient is high.

Technical scheme of the present invention:

A kind of method of utilizing microbiological fuel cell treating refuse percolate, step is as follows:

1) starts microbiological fuel cell: the glucose simulative organic wastewater is injected in the microbiological fuel cell, in temperature of reaction is under the condition of (30 ± 0.1) ℃, external 1000 Ω resistance, utilize anaerobic sludge to start microbiological fuel cell as inoculation liquid, when cell voltage is lower than 50mV, change the glucose simulated wastewater of anolyte compartment, treat that load voltage is stabilized in more than the 400mV, microbiological fuel cell starts successfully;

2) after microbiological fuel cell successfully starts, glucose wastewater in the anolyte compartment is changed into the mixing solutions of glucose and percolate, the voltage of record battery, frequency acquisition is point of per minute, the sample frequency of measuring COD be per two days once, when the clearance of the COD of the mixing solutions of glucose and percolate reaches 80% when above, change the glucose in the anolyte compartment and the mixing solutions of percolate.

Working mechanism of the present invention:

In the process for the treatment of refuse percolate, attached to the bacterial metabolism on the anode, organism is won electronics and is generated proton in the oxidized waste water, the electronics of being won is transferred on the anode electrode from microorganism, electronics arrives cathode electrode surface by external circuit, the proton of Sheng Chenging also arrives cathode electrode surface simultaneously, and the Tripotassium iron hexacyanide reaction in proton, electronics and the cathode compartment constitutes the loop.When obtaining electric energy because the katabolism of microorganism makes that organic concentration reduces in the waste water, and owing to the continuous domestication of microflora has the bacterium of electrochemistry can be at electrode surface by enrichment culture.

Advantage of the present invention is: when handling waste water, also the organic pollutant in the waste water can be transformed into electric energy, have that technology is simple, easy to implement, cost is low, the efficient advantages of higher, treatment effect and electrogenesis amount temperature influence are less, can use at normal temperatures, minimum application conditions is 20 ℃, and glucose and percolate volume ratio are that the clearance of 1: 1 o'clock COD reaches 85%.

Description of drawings

Fig. 1 is the structural representation of this microbiological fuel cell.

The open circuit voltage of microbiological fuel cell when Fig. 2 glucose and percolate are propellant combination

The electrogenesis characteristic of microbiological fuel cell when Fig. 3 glucose and percolate are propellant combination.

The clearance of COD in microbiological fuel cell when Fig. 4 glucose and percolate are propellant combination.

Among the figure: 1. anolyte compartment's 2. cathode compartments 3. proton films 4. anodes 5. negative electrodes

6-I, II. silicone gasket 7-I, II. backing plate 8-I, II. silica gel pad

9-I, II. electrode jack

Embodiment

Embodiment:

A kind of method of utilizing microbiological fuel cell treating refuse percolate, this microbiological fuel cell structure as shown in Figure 1, by anolyte compartment 1, cathode compartment 2, proton film 3, anode 4, negative electrode 5, silicone gasket 6-I, II, backing plate 7-I, II and silica gel pad 8-I, II constitutes, anolyte compartment 1 and cathode compartment 2 are the head type cylindrical structure, cylindrical portions may is reaction chamber, in the anolyte compartment 1 and the cylinder top of cathode compartment 2 be respectively equipped with electrode jack 9-I, II, anodic reaction chamber and cathodic reaction be indoor anode 4 and negative electrode 5 are set respectively and by lead respectively from electrode jack 9-I, the II sealing is drawn, proton film 3 is square, it is clipped in two silica gel pad 8-I, between the II and by two backing plate 7-I, II fixes, silica gel pad 8-I, II and backing plate 7-I, the center of II all has square square hole, the length of side of square hole is less than the length of side of proton film 3, proton film 3 and backing plate 7-I, II and silica gel pad 8-I, II constitutes the proton membrane module, two silicone gasket 6-I, II lays respectively between anolyte compartment 1 and cathode compartment 2 and the proton membrane module, the assembling back is connected and fixed by holding bolt, and described anode 4 is a carbon paper; Negative electrode 5 is a carbon paper, and cathode solution is the potassium ferricyanide solution of 0.1mol/L; The proton film is the Nafion117 film.

Comprise anodic dissolution in the anolyte compartment of this microbiological fuel cell, anodic dissolution can be rich in the organic sewage of organic high COD value, also can be simulated wastewater such as glucose, sodium acetate etc. that microorganism utilizes easily; Comprise cathode solution in the cathode compartment of described microbiological fuel cell, add cathode solution in cathode chamber after, cathode solution provides electron acceptor(EA), guarantees that battery electrode finishes reaction.Cathode solution can be lower than the solution of anolyte compartment's solution for this area redox potential commonly used.Negative electrode needs aerating oxygen or air, the gas that feeds in the cathode compartment, and resistance is little, less energy consumption, and competent electron acceptor(EA) can be provided, the present invention utilizes pneumatic pump to blast air to cathode compartment.That use in this laboratory and percolate COD is 12000mg/L, experimentation uses distilled water by 1: 1 dilution proportion percolate, and the COD value after the dilution is 8000mg/L.

Utilize the method for this microbiological fuel cell treating refuse percolate, step is as follows:

1) start microbiological fuel cell with the glucose simulated wastewater, the composition of glucose simulated wastewater and content are: glucose 1000mg/L, 10.32g/LNa ₂HPO ₄12H ₂O, 3.32g/LNaH ₂PO ₄, 0.31g/LNH4Cl, 0.13g/LKCL; After the anolyte compartment adds the glucose simulated wastewater, feed 20 minutes nitrogen earlier, to guarantee anaerobic environment in the anolyte compartment, add anaerobic sludge as inoculation liquid, fuel and seed sludge ratio are 10: 1 in the anolyte compartment; The cumulative volume of anodic dissolution and anaerobic sludge accounts for 95% of anolyte compartment's cubic capacity; Cathode solution is the potassium ferricyanide solution of 0.1mol/L, and the cathode solution that is added accounts for 95% of cathode compartment total volume; Reactor is placed in the thermostatic bath, and temperature is (30 ± 0.1) ℃; When loss of voltage during to 50mV, be one-period, the mensuration of COD adopts GB11914-89 water quality-COD determination.

2) after series of cells started one-period, voltage output was stable, and anolyte compartment's solution is replaced by the mixing solutions of glucose and percolate, and the volume ratio of glucose and percolate is 1: 1, and the solution composition of glucose and content are shown in step 1.

It is feasible as the propellant combination electrogenesis that microbiological fuel cell in the present embodiment (MFC) utilizes glucose and percolate, the ratio of glucose and percolate be 1: 1 o'clock MFC open circuit voltage as shown in Figure 2, open circuit voltage is up to 771mV as seen from Figure 2.After open circuit voltage is stable, the resistance of external 1000 Ω, under the resistance of 1000 Ω the electricity generation performance of MFC as shown in Figure 3, the maximum output voltage of MFC is 411mV as seen from Figure 3, peak power output density is 187mW/m ²When glucose and percolate are propellant combination the COD clearance as shown in Figure 4, the clearance through 13 days COD reaches 85% as seen from Figure 4.

The invention has the beneficial effects as follows: 1) clearance of percolate and glucose COD under melting concn reaches 85%. 2) the outside output electric energy of the Simultaneous Stabilization of degraded percolate. The maximum output voltage of MFC was 411mV when percolate and glucose were fuel combination, and peak power output is 187mW/m² The present invention can be in the situation of co-substrate at glucose and percolate, and acclimated microorganism can outwards be exported electric energy in the degraded percolate, carry out resource in the time of the disposal of refuse percolate and reclaim. Microbiological fuel cell of the present invention is stable, and the anode microorganism has the electro-chemical activity microorganism constantly in the anode enrichment, the outside output electric energy of the Simultaneous Stabilization of microbial degradation percolate through after constantly taming. The present invention has stable electric energy output when percolate is had removal effect preferably, be a kind of new method of efficient, free of contamination disposal of refuse percolate.

Claims (1)

1. method of utilizing microbiological fuel cell treating refuse percolate is characterized in that step is as follows:

1) starts microbiological fuel cell: the glucose simulative organic wastewater is injected in the microbiological fuel cell, in temperature of reaction is under the condition of (30 ± 0.1) ℃, external 1000 Ω resistance, utilize anaerobic sludge to start microbiological fuel cell as inoculation liquid, when cell voltage is lower than 50mV, change the glucose simulated wastewater of anolyte compartment, treat that load voltage is stabilized in more than the 400mV, microbiological fuel cell starts successfully;

2) after microbiological fuel cell successfully starts, glucose wastewater in the anolyte compartment is changed into the mixing solutions of glucose and percolate, the voltage of record battery, frequency acquisition is point of per minute, the sample frequency of measuring COD be per two days once, when the clearance of the COD of the mixing solutions of glucose and percolate reaches 80% when above, change the glucose in the anolyte compartment and the mixing solutions of percolate.

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