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Method for promoting electrolysis of sludge microorganisms for hydrogen production by joint use of ultrasound and alkali

A microbial electrolysis and ultrasonic technology, applied in the electrolysis process, electrolysis components, biochemical fuel cells, etc., can solve the problems of only 25% to 60%, long period of sludge anaerobic digestion, and low gas production rate and gas production rate. , to achieve the effect of less investment in equipment and equipment, wide applicability and improved utilization efficiency

Inactive Publication Date: 2017-09-26
HOHAI UNIV
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Problems solved by technology

However, studies have shown that the anaerobic digestion cycle of sludge is generally longer, resulting in a large area of ​​treatment facilities, and low gas production rate and volume
After 20 days of traditional mesophilic anaerobic digestion, the gas conversion efficiency of organic matter is only 25% to 60%.

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  • Method for promoting electrolysis of sludge microorganisms for hydrogen production by joint use of ultrasound and alkali

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Effect test

Embodiment

[0058] SS 7.61g / L, VSS 4.86g / L, TCOD 8954mg / L, SCOD 46mg / L, protein 2mg / L, total sugar 2mg / L, nucleic acid 3mg / L, ammonia nitrogen 79mg / L in the residual sludge of a sewage treatment plant , pH 7.3, γ1.04mS / cm.

[0059] After adding 1 mol / L NaOH to adjust the pH of the remaining sludge to 11, ultrasonic irradiation was performed, and ultrasonic reaction was performed for 30 minutes at a sound energy density of 1.5 W / mL to obtain sludge after ultrasonic and alkali treatment.

[0060] The SS of treated sludge is 6.58g / L, VSS 3.07g / L, TCOD 8638mg / L, SCOD 1039mg / L, protein 175mg / L, total sugar 82mg / L, nucleic acid 64mg / L, amino acid 58mg / L, ammonia nitrogen 112mg / L, pH 7.2, γ5.34mS / cm.

[0061] A single-chamber MEC was run with pretreated sludge as substrate.

[0062] Connect resistors in series between the two poles of the MEC reactor and apply an external voltage of 0.9V. At room temperature (19-25°C), the SS removal rate is 35.5%, the VSS removal rate is 45.8%, the TCOD remo...

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Abstract

The invention discloses a method for promoting electrolysis of sludge microorganisms for hydrogen production by joint use of ultrasound and alkali. The method comprises the following steps: by taking residual sludge of a municipal wastewater treatment plant as an inoculants, enriching electrochemically active microorganisms of a cathode through utilizing a two-chamber MFC (microbial fuel cell), and transferring the cathode as a cathode of a single-chamber MEC (microbial electrolysis cell); regulating the residual sludge to be alkaline, and performing ultrasound irradiation to obtain a mixed solution D; connecting an external circuit in series with a resistor at room temperature, and running the MEC to realize hydrogen production by taking the sludge subjected to ultrasound and alkali treatment as a substrate. According to the method, joint ultrasound and alkali treatment is performed on the residual sludge to damage flocs and the cell structure of the sludge to release most of organic substances wrapped with cell walls in the sludge into the liquid phase of the sludge and accelerate hydrolysis of the residual sludge, and the hydrogen production efficiency of the MEC is improved by organic matters dissolved after the sludge is disintegrated; stable, reduction and resourceful treatment of the residual sludge of the municipal wastewater treatment plant is successfully realized, and the method is simple in principle, convenient to operate, less in equipment and apparatus investment and high in practicability and applicability.

Description

technical field [0001] The invention relates to a sludge microbial electrolysis hydrogen production technology, in particular to a method for promoting the sludge microbial electrolysis hydrogen production by combining ultrasound and alkali. Background technique [0002] In recent years, my country's urban sewage treatment volume has increased year by year, and the sewage treatment rate has continued to increase. Excess sludge is a by-product of sewage treatment. The annual output in my country is 35 million tons, and its water content is about 99%. Its components include sediment, fiber, colloid, organic matter, microorganisms and metal elements. [0003] Anaerobic digestion is an important way to realize the production of clean energy from excess sludge, that is, to use anaerobic bacteria to degrade the organic matter in the sludge in an anaerobic environment to generate biogas (mainly composed of methane). Anaerobic digestion has the advantages of low operating cost, sim...

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Application Information

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IPC IPC(8): H01M8/16C25B1/02C25B11/12
CPCC25B1/02C25B11/043H01M8/16Y02E60/50
Inventor 孙杏胡凯陈卫贾硕秋
Owner HOHAI UNIV
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