Comprehensive treatment process and system for preparing gas fertilizer by cooperation of biological drying and gasification of sludge

Abstract

A comprehensive treatment process for preparing a gas fertilizer by cooperation of biological drying and gasification of sludge comprises the following steps: dehydrating excess sludge with water content of 80% by using mechanical filter pressing until the water content is reduced to 55-65%; carrying out biological drying and further dehydration treatment on the wet sludge subjected to conditioning and filter pressing by adopting cheap and easily available biomass powder to reduce the water content to 30-40%; and the addition of the biomass powder gives consideration to the advantages of conditioning the characteristics of the sludge, improving the heat value of the sludge and the like, the sludge subjected to secondary dehydration is fed into a low-temperature gasification furnace to finally obtain the carbon fertilizer, and high-temperature tar gas generated in the treatment process is subjected to photocatalytic cracking and adsorption purification to obtain high-quality synthetic gas. The invention further provides a comprehensive treatment system for preparing the gas fertilizer through cooperation of biological drying and gasification of the sludge. The comprehensive treatment process and system for preparing the gas fertilizer through cooperation of biological drying and gasification of the sludge are stable and reliable in operation, easy to operate, environment-friendly and energy-saving.

Description

technical field [0001] The invention relates to a process and system for synergistic preparation and treatment of sludge energy-saving deep drying and gasification to produce synthetic gas and carbon fertilizer, and the invention belongs to the technical field of sludge energy treatment. Background technique [0002] Since the reform and opening up, with the development of my country's social economy and the rapid development of urbanization, the population has grown day by day, the level of urbanization has continued to improve, the number and scale of urban sewage plants have continued to increase, and the discharge and treatment of urban sewage have increased sharply. , followed by a significant increase in the production of sludge, a by-product of sewage. As of the end of December 2017, a total of 5,027 sewage treatment plants have been built in cities and counties across the country, with a sewage treatment capacity of 188 million cubic meters per day, and an annual outp...

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Problems solved by technology

However, considering whether the heavy metals in the sludge will cause secondary pollution of soil and crops and enter the human body through the food chain, whether the parasite eggs and virus pathogens in the sludge will affect the public environment and sanitation, and whether they will pollute the groundwater, etc. issues, the land use of sludge, especially the agricultural use of sludge, is controversial

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