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Production method for butyric acid through anaerobic fermentation of excess sludge

An anaerobic fermentation and excess sludge technology, applied in the field of solid organic waste recycling, can solve the problems of unsatisfactory economic benefits of excess sludge and low added value of products, so as to alleviate the pressure of environmental pollution and promote metabolism and growth , the effect of enhancing productivity

Inactive Publication Date: 2014-01-01
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

However, no matter whether the excess sludge is used to produce methane or hydrogen, the value-added content of the obtained products is relatively low, resulting in unoptimistic economic benefits for the resource utilization of excess sludge.

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  • Production method for butyric acid through anaerobic fermentation of excess sludge
  • Production method for butyric acid through anaerobic fermentation of excess sludge
  • Production method for butyric acid through anaerobic fermentation of excess sludge

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Embodiment Construction

[0014] The present invention is further described below in conjunction with the accompanying drawings and examples, but not limited by the accompanying drawings and examples.

[0015] The method of the present invention is described as follows:

[0016] The invention relates to a method for increasing the yield of butyric acid produced from organic matter in excess sludge by using excess sludge as raw material and adding a composition of trace hydrated metal compounds that enhance the activity of butyrate-producing bacteria. Specifically include the following steps:

[0017] (1) Using excess sludge as raw material, adjust the solid mass concentration of sludge, add NaOH to process and centrifuge, and get the supernatant as the substrate for anaerobic fermentation to produce butyric acid;

[0018] (2) Choose ZnSO 4 ·7H 2 O, CoCl 2 ·6H 2 O, CuCl 2 2H 2 O, MnCl 2 4H 2 O and FeSO 4 ·7H 2 The five factors are independent variables, and different levels are designed respe...

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Abstract

The invention provides a production method for butyric acid through anaerobic fermentation of excess sludge, which belongs to the field of reclamation of solid organic waste. The method comprises the following steps: 1, with excess sludge as a raw material, adjusting mass concentration of the sludge, adding NaOH for treatment, carrying out centrifugation and taking supernatant as a fermentation substrate; and 2, adding a composition of ZnSO4.7H2O, CoCl2.6H2O, CuCl2.2H2O, MnCl2.4H2O and FeSO4.7H2O for anaerobic fermentation so as to obtain butyric acid. The addition amount of the above-mentioned five metal hydrates is set according to the principles of Box-Behnken central composite design in response surface software. According to experimental results, a model equation for production of butyric acid through anaerobic fermentation of excess sludge is established, and an optimal combination condition of the metal hydrates for realization of maximum yield of butyric acid is determined. The addition amount of the metal hydrates is tiny, and the method has the characteristics of low cost, a high conversion rate, a short fermentation period, etc.

Description

technical field [0001] The invention discloses a method for producing butyric acid through anaerobic fermentation of excess sludge, which belongs to the field of solid organic waste resource utilization. More specifically, the present invention relates to a method for converting organic matter in excess sludge into butyric acid by adding a composition of trace hydrated metal compounds necessary for butyrate-producing bacteria in an anaerobic reactor. technical background [0002] The sustained and rapid development of the national economy will inevitably lead to an increase in domestic sewage discharge year by year. With the increase of sewage discharge, the treatment intensity is bound to increase accordingly. At present, 86.2% of the sewage treatment plants adopt the activated sludge method, resulting in a large amount of residual sludge, which is the by-product of the sewage treatment process. As far as a secondary sewage treatment plant is concerned, the amount of exce...

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Application Information

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IPC IPC(8): C12P7/52
Inventor 刘晓玲宋永会王健孙晨王思宇向连城田智勇
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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