Municipal sludge two-stage deep dehydration method combining chemical regulation strengthening preliminary mechanical dehydration and electroosmosis

Abstract

The invention relates to a municipal sludge deep dehydration composite conditioner and a dehydration method, the composite conditioner accounting for 3-30% by dry basis weight of sludge is added for conditioning modification of domestic sewage treatment plant concentrated sludge with the moisture content of about 97% to improve sludge preliminary mechanical dehydration and subsequent electroosmosis dehydration ability; the moisture content of the preliminarily dehydrated conditioned modified sludge is reduced to 70-85%; the preliminarily dehydrated sludge directly enters into electroosmosis dehydration equipment for deep dehydration, the moisture content of the sludge is reduced to 40 to 60%, landfill disposal, thermal conversion, use as building materials and other treatment, dispose and resource utilization can be directly carried out. The method can realize the continuous operation of sludge dehydration, is high in treatment efficiency, can effectively reduce the bound water content of the sludge, is good in dehydration effect, and low in moisture content of deeply dehydrated sludge cake, and is suitable for a newly-constructed sewage treatment plant and design requirements of reconstruction, expansion and contingency plans of sludge dehydration treatment of a sewage treatment plant in the prior art.

Description

technical field [0001] The invention relates to a new method of municipal sludge chemical conditioning strengthening preliminary mechanical dehydration-electric osmosis two-stage deep dehydration, which belongs to the technical field of urban sewage discharge sludge treatment and disposal, and is a new method for the treatment and disposal of excess sludge in urban sewage treatment plants. The process meets the requirements of sludge reduction, stabilization and harmlessness. Background technique [0002] The technology of my country's urban sewage treatment facilities is still dominated by biological methods, and a large amount of excess sludge will be produced in the process of wastewater treatment. According to relevant statistics of the "China Urban Drainage and Sewage Treatment Bulletin 2006-2010" issued by the Ministry of Housing and Urban-Rural Development, the total output of dewatered sludge (with a moisture content of 80%) in China in 2010 was close to 22 million t...

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Problems solved by technology

[0007] The Chinese patent document "An Inorganic Composite Sludge Dehydration Conditioner and Its Application" (publication number CN101851053A) discloses a sludge dehydration conditioner and a conditioning method, specifically adding sludge accounting for 10-100% of the dry weight of the sludge Conditioning agent (sodium dodecylbenzene sulfonate and sodium hydroxide) conditions the sludge, and uses a plate and frame filter press to dehydrate the conditioned sludge, but only dewatered sludge with a moisture content of 70-75% can be obtained

At present, the dewatered sludge of the sewage treatment plant with a water content of 80% is mainly used as the research and experimental object for electroosmotic dehydration. Since the dewatered sludge of the sewage treatment plant is only added with a polymer flocculant to condition the sludge, there is no electroosmotic treatment. The dehydration process modifies the sludge, so the effect of electroosmotic deep dehydration directly on the dewatered sludge is not ideal

At the same time, in the relevant patented technology of sludge dewatering, there is basically no introduction of a new process that combines the electro-osmosis deep dewatering process with the original preliminary mechanical dewatering technology of the sewage plant, and there is no introduction to improve the initial mechanical dehydration of sludge and the follow-up Introduction of patents on electro-osmotic dehydration capacity sludge composite conditioning method and deep dehydration process

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