Method for enhancing anaerobic digestion and methane production of excess sludge by zero-valent iron and activated carbon

A technology for anaerobic digestion and excess sludge, applied in electrochemical sludge treatment, chemical instruments and methods, biological sludge treatment, etc., can solve the problems of low organic matter degradation rate, low methane production efficiency, limited promotion and application, etc. , to achieve the effect of promoting decomposition, increasing activity and strengthening contact
CN107522375AInactive Publication Date: 2017-12-29SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2017-12-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of sludge treatment and recycling and discloses a method for enhancing anaerobic digestion and methane production of excess sludge by zero-valent iron and activated carbon. The method comprises steps as follows: (1), the excess sludge, inoculated sludge and water are mixed, pH is regulated to 6-7.5, solid content of a mixture is enabled to be 8%-12%, and mixed sludge is obtained; (2), the mixed sludge, activated carbon and zero-valent iron are added to an anaerobic digestion device, and anaerobic digestion is implemented; (3), gas produced in the anaerobic digestion process is collected. According to the method, the anaerobic digestion is better promoted by adding activated carbon and zero-valent iron simultaneously; the method is simple, reaction conditions are mild, a gas producing effect is better than that of a traditional method, recycling, harmless and reducing treatment of the excess sludge of a sewage treatment plant is realized, and the method has good economic and social benefits.
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Description

technical field

[0001] The invention belongs to the technical field of sludge treatment and resource utilization, and relates to a method for simultaneously adding zero-valent iron and activated carbon to strengthen anaerobic digestion of excess sludge to produce methane. Background technique

[0002] Due to the increase in the number of urban sewage plants and the increase in the amount of sewage treatment, the amount of surplus sludge produced by the activated sludge process is also increasing. The total amount of dry sludge in EU countries has reached more than 10 million tons per year. In China, more than 11.2 million tons of dewatered sludge are produced every year, and nearly 80% of them have not been stably treated, and the annual growth rate is greater than 10%. The excess sludge produced contains a large amount of organic matter such as protein, polysaccharide, etc. Direct discharge will not only cause secondary pollution of the environment, but also cause a large a...

Claims

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