Treatment method of high calorific value excess sludge

Abstract

The invention provides a treatment method of high calorific value excess sludge. The method comprises the following steps of: feeding the excess sludge to be treated with moisture content of 80 to 90 percent into a plate-and-frame water filter press for dehydration to obtain a filter-pressing dehydrated sludge cake; feeding the obtained sludge cake into a sludge granulation device; crushing the sludge cake into coarse granules at normal temperature; further drying the sludge granules in a heat energy drying room; feeding the dried sludge granules into sludge powdering equipment for further treatment, wherein the grain diameter of the treated sludge powder is 150 to 300 meshes, and the water ratio is 5 to 15 percent; storing sludge dried powder into a sludge dried powder warehouse, and spraying the sludge powder having small grain diameter and having a calorific value of 2,000 to 4,000 kilocalories into a sludge burning furnace to completely burn with a small amount of fuels or without the fuels, wherein the interior temperature of the burning furnace is 800 to 1,000 DEG C, and secondary pollution is avoided; and then conducting high-temperature fume which is generated by burning into a waste heat drying device, and drying the sludge. By the process, the burning treatment of the sludge can be performed conveniently, the energy consumption of sludge drying is reduced, the excess sludge is treated properly, and the secondary environmental pollution is avoided.

Description

technical field [0001] The invention relates to the field of excess sludge treatment and disposal, in particular to the disposal method of excess sludge with relatively high calorific value. Background technique [0002] Residual sludge is the solid sediment produced in the process of sewage treatment, which contains a large amount of water, inorganic ash and organic volatiles. With the development of social economy and urbanization in our country, the generation and quantity of urban sewage are constantly increasing. At present, there are more than 500 urban sewage treatment plants in operation across the country, with an annual treatment capacity of 11.36 billion m 3 . According to relevant predictions, the amount of urban sewage in my country will increase significantly in the next two decades, and the amount of sewage discharged by the end of 2010 will reach 440×108 m 3 / d; in 2020, the sewage discharge volume will reach 536×108 m 3 / d. The improvement of sewage tre...

AI Technical Summary

Problems solved by technology

If the remaining sludge is not properly treated and disposed of, it will not only occupy a large amount of land, but also cause secondary pollution to the environment and become a major public hazard affecting urban environmental sanitation.

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