A method for producing butyric acid by anaerobic fermentation of excess sludge
A technology of anaerobic fermentation and excess sludge, which is applied in the field of solid organic waste recycling, can solve the problems of unoptimistic 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: 2016-09-07
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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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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[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 by organic matter in excess sludge by using excess sludge as raw material and adding a composition of a trace amount of hydrated metal compound that enhances the activity of butyrate-producing bacteria. Specifically include the following steps:
[0017] (1) Use 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 design...
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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. The steps of the method are as follows: ①Using excess sludge as raw material, adjusting the mass concentration of sludge, adding NaOH for treatment and centrifuging, and taking the supernatant as a fermentation substrate; ②Adding 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 composition of O was subjected to anaerobic fermentation to obtain butyric acid. The addition of these five hydrated metal compounds was designed using the Box-Benhnken central combination design principle in the response surface software. According to the experimental results, the model equation for the production of butyric acid by anaerobic fermentation of excess sludge was established, and the optimal combination conditions of hydrated metal compounds for the maximum yield of butyric acid were established. The hydrated metal compound added in the invention is extremely small, and has the characteristics of low cost, high conversion rate, short fermentation period and the like.
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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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马瑾
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI