Method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge

Abstract

The invention relates to a method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge, which comprises the following steps: 1)a calcium peroxide processing unit: placing the calcium peroxide in the sludge, wherein the mass ratio of calcium peroxide to sludge is 0.01: 1-0.6:1, reacting for 1-24 hours, and hydrolyzing the sludge; and 2)an anaerobic digestion unit: after processing the calcium peroxide, performing anaerobic digestion on sludge under the effect of anaerobe and amphimicrobe in an anaerobic digestion tank, rapidly using an organic compound in the sludge, conversing to methane, carbon dioxide and water, increasing the sludge biogas output and then realizing the quantitative reduction. Compared with the prior art, the method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge has the advantages of low cost, shortened digestion time and easy enforcement.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, in particular to a method for using calcium peroxide to promote sludge hydrolysis and improve the effect of sludge anaerobic digestion. Background technique [0002] The biological sewage treatment method based on activated sludge is currently the most widely used sewage biological treatment technology in the world, but this method has always had the disadvantage of producing a large amount of excess sludge. With the increasing amount of sewage and the continuous improvement of sewage treatment rate, my country's sludge production will increase significantly in the next few years. It is estimated that the sewage discharge in 2020 will reach 5.46×10 10 m 3 / d, the amount of dry sludge generated is 45.42 million tons. Although the amount of sludge accounts for only 1-2% of the amount of sewage, the investment in sludge treatment facilities accounts for about 40%-50% of the total investment i...

AI Technical Summary

Problems solved by technology

[0006] The traditional anaerobic digestion process has the following disadvantages: the sludge residence time is long, which takes 20-30 days, so the facility occupies a large area, the infrastructure cost is high, and the removal rate of organic matter is low, only about 40%

[0008] Studies on calcium peroxide are mostly used in soil remediation, but there is no report on its use in sewage treatment plant sludge treatment

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