Solar enhanced sludge biological drying and gasified gas comprehensive treatment process and system

Abstract

The invention relates to a solar enhanced sludge biological drying and gasified gas comprehensive treatment process. The process comprises the following steps: dehydrating residual sludge with the water content of about 80% by using mechanical filter pressing until the water content is reduced to 55-65%; enabling a solar efficient condenser to provide a heat source to heat air and introduce hot air in order to enhance sludge biological drying through green energy; then, conditioning the wet sludge subjected to filter pressing by adopting cheap and easily available biomass powder, and biologically drying for further dehydration treatment to reduce the water content to 30-40%, wherein the addition of the biomass powder gives consideration to the advantages of conditioning the characteristicsof the sludge, improving the heat value of the sludge and the like; and carrying out secondary dehydration, feeding the dehydrated sludge into a high-temperature gasification furnace, and enabling high-temperature tar gas generated in the treatment process to be subjected to three-stage water cooling and adsorption filtration treatment to finally obtain high-quality synthetic gas. The invention further provides a solar enhanced sludge biological drying and gasified gas comprehensive treatment system. According to the invention, reduction, harmlessness, recycling and stabilization treatment ofsludge is realized.

Description

technical field [0001] The invention belongs to the technical field of sludge resource treatment, and relates to a comprehensive treatment process and system for solar-enhanced sludge biological drying and gasification gas. Background technique [0002] After the reform and opening up, with the rapid development of my country's social economy and the increasing level of urbanization, the number and scale of urban sewage plants have continued to expand, and the output of urban sewage and sludge has increased sharply. As a product of sewage treatment plants, sludge has a very complex composition. It is an aggregate composed of bacterial micelles formed by various microorganisms and their adsorbed organic and inorganic substances. Moreover, the water content of the sludge is relatively high, and the water content after preliminary dehydration is still above 80%. It also contains high organic matter, has poor stability, is easy to rot and emits a bad smell. [0003] Sludge is r...

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Problems solved by technology

According to the survey conducted by the China Environmental Engineering Research Center, in my country's sludge treatment and disposal methods, agricultural use accounts for about 44.8%, landfill accounts for about 31%, other disposal accounts for about 10.5%, and about 13.7% of urban sludge has not been used. Any treatment will return to the natural world, and the reduction, stabilization and resource utilization of sludge have not been realized.

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