Deep sludge dewatering process

Abstract

The invention belongs to the field of sludge treatment, in particular to a deep sludge dewatering process. The process comprises the following steps of: performing flocculation reaction on sludge with water content of over 96 percent which is produced after sewage treatment; overflowing the sludge subjected to the flocculation reaction to a concentrator for concentration and dewatering; pulping and conditioning in a pulping machine after the concentration and dewatering; conveying to a deep dewatering machine by a high-pressure sludge pump to perform deep dewatering; and finally conveying to a crusher to crush the sludge into powdery or blocky sludge and conveying the crushed sludge to a boiler for burning or recycling. In the process, processing is performed at normal temperature, noise, odor, secondary pollution and pollution mode transfer are avoided, the process does not depend on any boundary condition or consume a primary energy source, the sludge with the water content of 80 to 90 percent can be dehydrated to be sludge with the water content of below 45 percent, the dehydrated sludge cakes cannot be restored when contacting water, and sludge cakes can be crushed into small blocky or powdery sludge in order to make the resource utilization convenient and moisture can continuously evaporate in a natural state.

Description

technical field [0001] The invention belongs to the field of sludge treatment, in particular to a sludge deep dewatering process. Background technique [0002] As of June 5, 2008, China had built and operated 1,408 sewage treatment plants with a treatment capacity of 83.16 million m3 / d, and 1,004 sewage treatment plants were under construction (completed before the end of 2010), with an estimated scale of at least 37.36 million m3 / d. d, that is, by the end of this year, the treatment capacity of urban sewage treatment plants in China will reach 120 million m3 / d. Based on 7.5 tons of dewatered sludge with a moisture content of about 80% per 10,000 m3 of sewage, the country will produce 90,000 tons of dewatered sludge every day. Due to factors such as economic development, the phenomenon of "heavy water and light mud" is very serious. At present, most sewage treatment plants have only completed sludge concentration and dewatering and outbound transportation to landfill. Due t...

AI Technical Summary

Problems solved by technology

This kind of water is adsorbed or wrapped inside the particles by solid particles. Since it is firmly held by the very strong negative charge on the periphery and is in balance with the positive charge in the water core, the traditional dehydration process has certain limitations. Part of the free water generally has a moisture content of 70-80%, which is not conducive to the treatment of sludge and the utilization of resources after treatment.

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