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Method for improving excess activated sludge anaerobic fermentation hydrogen production efficiency

A technology of sludge anaerobic fermentation and residual activity, applied in the field of resource utilization of organic waste, can solve problems such as insignificant effect, achieve the effect of improving the degree of resource utilization, improving the hydrogen production capacity of fermentation, and improving efficiency

Inactive Publication Date: 2016-05-11
FUDAN UNIV
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Problems solved by technology

In the above reports, the hydrogen production was increased by means of pretreatment or adjusting pH, fermentation temperature, etc., but the effect was not significant

Method used

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  • Method for improving excess activated sludge anaerobic fermentation hydrogen production efficiency
  • Method for improving excess activated sludge anaerobic fermentation hydrogen production efficiency

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Concentrate the remaining activated sludge from the sewage treatment plant. The total suspended solids (TSS) of the concentrated sludge is 10.6g / L, and the volatile suspended solids (VSS) is 6.9g / L. No other pretreatment process is required.

[0014] (2) Divide the concentrated sludge into two 500mL reactors, each reactor is equipped with 400mL concentrated sludge, adjust the initial pH of the sludge in the reactor to 10.06-10.14, and blow off the exhaust gas After the oxygen environment, one reactor was fermented in a shaking table at 37°C, and the other was fermented in a shaking table at 55°C. The fermentation process lasted for 6 days. The control is 10 for alkaline conditions. The content of gas components is determined by a gas chromatograph, and the gas volume is collected by a gas collection bag. After the reactor runs stably, the hydrogen output in the two reactors is as shown in Table 1:

[0015] Table 1 Effect of temperature on alkaline fermentation hyd...

Embodiment 2

[0019] (1) Concentrate the remaining activated sludge from the sewage treatment plant. The total suspended solids (TSS) of the concentrated sludge is 10.6g / L, and the volatile suspended solids (VSS) is 6.9g / L. No other pretreatment process is required.

[0020] (2) Divide the concentrated sludge into three 500mL reactors, each reactor is equipped with 400mL concentrated sludge, adjust the initial pH of the sludge in the reactor to 8, 9, 10, and use nitrogen to Air stripping creates an anaerobic environment, and the reactors are placed in a shaking table at 55°C for anaerobic fermentation, and the hydraulic retention time is 6 days. During the fermentation process, 4M NaOH was added dropwise through the pH automatic titrator to always control the sludge in the three reactors to be 8, 9, and 10 respectively. During the operation of the reactor, the gas component content is measured by a gas chromatograph, and the gas volume is collected by a gas collection bag. After the reacto...

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Abstract

The invention belongs to the technical field of organic waste matter resource utilization, and particularly relates to a method for improving excess activated sludge anaerobic fermentation hydrogen production efficiency. The method comprises the steps that the pH in the whole process of excess activated sludge anaerobic fermentation hydrogen production is controlled to be about 10 all the time, the fermentation temperature is ensured to be within a high temperature range, the activity of homoacetogenic bacteria is sufficiently restrained, and the obtained hydrogen yield can reach 81 mL H2 / g-VSS which is obviously higher than the excess activated sludge anaerobic fermentation hydrogen yield being about 25 mL H2 / g-VSS reported at present. No pretreatment process needs to be carried out on activated sludge, the waste organic matter anaerobic fermentation hydrogen production level can be effectively improved, production of clean energy hydrogen is facilitated, and meanwhile resource utilization is carried out on excess activated sludge and other waste organic matter.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of organic waste, and in particular relates to a method for improving the efficiency of hydrogen production by fermenting residual activated sludge in a sewage treatment plant. Background technique [0002] With the development of the economy, more and more attention has been paid to energy issues. Traditional fossil energy is far from meeting people's requirements. Hydrogen energy, as a pollution-free and renewable ideal fuel, is considered to be the most attractive alternative energy source. Hydrogen only produces water after combustion, and has a high calorific value of combustion (142.35kJ / g), which is 2.75 times that of gasoline, 3.9 times that of alcohol, and 4.5 times that of coke. In addition, hydrogen is also an important chemical raw material in many industrial productions. Therefore, hydrogen production has become an important research direction. [0003] Among many hydro...

Claims

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Application Information

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IPC IPC(8): C12P3/00C02F11/04
CPCC02F11/04C12P3/00Y02P20/10
Inventor 罗刚万晶晶张士成
Owner FUDAN UNIV
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