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Method of utilizing residual sludge to produce hydrogen through step type serially connected up-flow anaerobic sludge bed and microbial electrolysis cell

A microbial electrolysis cell, up-flow anaerobic technology, applied in water/sludge/sewage treatment, biosynthesis, sludge treatment, etc., can solve problems such as increasing the cost of hydrogen production, and achieve strong practicability and wide applicability Effect

Pending Publication Date: 2017-10-24
HOHAI UNIV
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Problems solved by technology

However, anaerobic fermentation can only produce good results under medium or high temperature environmental conditions. In the actual operation and maintenance process, maintaining medium or high temperature will increase the cost of hydrogen production

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0082] An example of hydrogen production from excess sludge using an upflow anaerobic sludge bed and a microbial electrolytic cell in series:

[0083] SS 7.51g / L, VSS 5.16g / L, TCOD 8774mg / L, SCOD 46mg / L, protein 3mg / L, total sugar 4mg / L, nucleic acid 4mg / L, ammonia nitrogen 81mg / L in the residual sludge of a sewage treatment plant .

[0084] In UASB, the constant temperature is 35°C, the pH of the reactor is controlled to be 5, the organic load is 2-5kgCOD / m3·d, the HRT is 26h, the SRT is 8d, the ORP is -300--200mV, and the C / N is 160-250.

[0085] The utilization rate of protein in the remaining sludge after fermentation and acid production is 54.93%, the utilization rate of total sugar is 39.11%, the time for the total VFAs to reach the maximum is 3 days, the maximum amount is 1383.05mgCOD / L, and the acid production rate is 197.55 mgCOD / gVSS.

[0086] Connect a resistor in series between the two poles of the MEC, apply an external voltage of 0.8V, control the temperature a...

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Abstract

The invention discloses a method of utilizing residual sludge to produce hydrogen through a step type serially connected up-flow anaerobic sludge bed and microbial electrolysis cell. The method comprises the following steps: taking the anaerobic sludge of other anaerobic reactors as the inoculated sludge and the residual sludge of a sewage plant as the substrate, starting a UASB reactor; taking the residual sludge of the sewage plant as the inoculum, utilizing double chamber MFC to enrich anode current-producing bacteria; transferring the anode with enriched current-producing bacteria to MEC, taking the anode as the anode of MEC; feeding residual sludge into started UASB reactor, fully contacting residual sludge with fermentation microbes in each layer of granular sludge so as to carry out anaerobic fermentation acid producing reactions; and after fermentation and acid production, transferring the residual sludge to a microbial electrolysis cell (MEC) to carry out room temperature hydrogen production. Two technologies are used together, the residual sludge is stabilized and converted into resources, and the problems of low energy recovery rate and low organic substance utilization rate in the anaerobic digestion technology are solved.

Description

technical field [0001] The invention relates to a method for producing hydrogen by utilizing excess sludge, in particular to a method for producing hydrogen by utilizing excess sludge in series with an upflow anaerobic sludge bed and a microbial electrolytic cell. Background technique [0002] Excess sludge is a by-product of sewage treatment, with a moisture content of about 98%-99%, containing sediment, fibers, colloids, organic matter, microorganisms and metal elements. The organic matter in the sludge not only has a high concentration and is not easy to degrade, but also contains more pathogenic microorganisms, which will pollute the water body and soil. Therefore, the stabilization of excess sludge is the main goal of sludge treatment. [0003] At present, the commonly used method for stabilizing excess sludge is anaerobic digestion, but anaerobic digestion has disadvantages such as long start-up time, slow reaction speed, and large floor space. Hydrogen is a clean en...

Claims

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Application Information

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IPC IPC(8): C12P3/00C02F11/00
CPCC02F11/006C12P3/00Y02P20/59
Inventor 孙杏胡凯陈卫贾硕秋
Owner HOHAI UNIV
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