Sludge treatment method

Abstract

The invention provides a sludge treatment method which specifically comprises the following steps: (1), anaerobic fermentation and sterilization of the sludge, namely storing the sludge with moisture content of 80% into a sludge storage tank to carry out anaerobic fermentation, stabilizing the sludge by virtue of metabolic activities of microorganisms under an anaerobic condition, and producing methane and CO2 at the same time; (2), chemical conditioning, and sterilization and disinfection of the sludge, namely adding a 4# additive into the sludge subjected to the anaerobic fermentation and sterilization treatment in the step (1) to carry out chemical conditioning of dehydration pretreatment onto the sludge, 3-6 minutes later, adding a 2# additive to kill bacteria and viruses in the sludge, and passivating heavy metals in the sludge to continuously break a colloid structure of the sludge; (3), mixing, stirring and concentrating, namely mixing, stirring and concentrating the sludge treated in the step (2); and (4), mechanical dehydration, namely carrying out mechanical dehydration onto the sludge which is mixed, stirred and concentrated in the step (3), so that the moisture content of the sludge reaches 50%-60%.

Description

Technical field [0001] The invention belongs to the field of sludge treatment, and specifically relates to a sludge treatment method. Background technique [0002] With the continuous improvement of my country's urbanization level, the construction of sewage treatment facilities has developed rapidly. According to the "2013-2017 China's sludge treatment and disposal in-depth investigation and investment strategic planning analysis report" statistics in 2010 my country's urban sewage treatment plants have built 2500 Many cities have a sewage treatment capacity of 122 million tons per day, making great contributions to achieving the national emission reduction targets and improving the water environment. However, the construction and operation of sewage treatment plants have accompanied a large amount of surplus sludge. With a moisture content of 80%, the total annual sludge water production in the country will soon exceed 30 million tons, and the sludge treatment situation is very ...

AI Technical Summary

Problems solved by technology

[0004] There are many factors restricting the construction of sludge treatment and disposal facilities, but one of the important restrictive factors is that the overall technical route of national sludge treatment and disposal is not clear enough

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