Method for strengthening electricity generating performance of MFC (micro-function circuit) by taking excess sludge as fuel and strengthening sludge reduction by enzyme

A technology of excess sludge and electrical properties, applied in the fields of biochemical fuel cells, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of slow hydrolysis rate and limit the reduction of sludge in the electricity production characteristics of microbial fuel cells and other problems, to achieve the effect of saving costs, improving the performance of electricity production, and making full and effective use.

Inactive Publication Date: 2012-07-11
HUNAN UNIV
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Problems solved by technology

Under natural conditions, the hydrolysis rate of these macromolecules is very slow, which limits the power generation characteristics and the effect of sludge reduction in microbial fuel cells

Method used

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  • Method for strengthening electricity generating performance of MFC (micro-function circuit) by taking excess sludge as fuel and strengthening sludge reduction by enzyme
  • Method for strengthening electricity generating performance of MFC (micro-function circuit) by taking excess sludge as fuel and strengthening sludge reduction by enzyme
  • Method for strengthening electricity generating performance of MFC (micro-function circuit) by taking excess sludge as fuel and strengthening sludge reduction by enzyme

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Embodiment Construction

[0025] specific implementation plan

[0026] Below in conjunction with specific embodiment, the present invention is further explained and illustrated:

[0027] 1. Conditioning of excess sludge

[0028] Use the remaining sludge from the secondary settling tank of the sewage treatment plant, sieve (aperture 0.66mm) and settle at 4°C for 24 hours, then discard the supernatant and get concentrated sludge (to make the TCOD concentration of the remaining sludge reach 9000mg -13000mg is enough, and the specific parameters of the treated sludge in the embodiment of the present invention are shown in Table 1). The sludge was left at room temperature to restore microbial activity before starting the MFC run. The main components of sludge are carbohydrates and proteins, and the basic parameters are shown in Table 1.

[0029] Table 1 The basic parameters of the sludge used in the experiment

[0030]

[0031] 2. Assembly and operation of MFC, see figure 1 .

[0032] Add 250ml con...

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Abstract

The invention belongs to the filed of microbiological fuel cells, and provides a method for strengthening electricity generating performance of an MFC (Microbial Fuel Cell) by taking excess sludge as fuel and strengthening sludge reduction by enzyme. The method comprises the steps of adding 20mM of NaCl in the excess sludge for strengthening the electrical conductivity of solution, adding neutral protease and Alpha-amylase, and generating electricity by directly using electricity generating microorganisms in the excess sludge for one day so as to start the MFC and obtain higher electric energy, wherein the strengthening effect of the neutral protease and the Alpha-amylase on an SMFC (Sediment Microbial Fuel Cell) at 40 DEG C is the most obvious. Under a condition that the total concentration of the enzyme is not changed, the mass concentration ratio of the neutral protease and the Alpha-amylase is 2:3, at the moment, the power density is the largest (776mW*m-2), and the removal rates of TCOD (total chemical oxygen demand), TSS (total suspended solids) and VSS (volatile suspended solids) reach 87.29%, 91.75% and 95.01% respectively. The method is fast in starting, simple in process, convenient to operate, and low in cost, and can treat the excess sludge in an urban domestic sewage treatment plant.

Description

technical field [0001] This technology relates to the field of microbial fuel cell (MFC), in particular to a microbial fuel cell (SMFC) that uses excess sludge as fuel. It is to add enzymes to SMFC to enhance its power generation performance and enhance sewage Mud reduction. Background technique [0002] At present, my country's sludge production is about 25 million tons per year (calculated based on a moisture content of 80%). If not properly treated and disposed of in time, harmful components in sludge such as heavy metals, pathogenic bacteria, parasites, organic pollutants and odor will become public hazards affecting urban environmental sanitation. At present, the general methods of sludge disposal include landfill, incineration, and throwing into the sea. If it is not handled properly, it will cause serious secondary pollution. [0003] A microbial fuel cell (MFC) is a device that uses microorganisms to directly convert chemical energy in organic matter into electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/16C02F11/00C02F11/02
CPCY02E60/527Y02E60/50
Inventor 张植平李小明刘志华杨麒罗琨
Owner HUNAN UNIV
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