Method for quick pyrolysis treatment and in situ conversion product utilization of sludge

Abstract

The invention relates to a method for quick pyrolysis treatment and in situ conversion product utilization of sludge. The method comprises six steps of sludge dehydrating and drying, quick intermediate temperature sludge pyrolyzing, pyrolytic product separating, pyrolytic oil power generating and waste-heat utilizing, pyrolytic gas recycling and pyrolytic carbon activating and activated carbon absorbent refining of waste gases. The method is adopted to treat the sludge produced by urban sewage treatment plants and the industrial sludge produced by industries such as papermaking, leather, dyeing and finishing, the sludge can be obviously reduced, the pyrolytic conversion product of the sludge is utilized for the sludge reduction treatment and waste gas purification in situ, and links such as storage and transportation are dispensed; and the method is an intensive treatment mode and has the advantages of high energy recovery rate, small secondary sludge, high harmless degree, low operation cost, obvious environmental benefit and the like.

Description

technical field [0001] The invention relates to a treatment and utilization method of sludge produced in urban domestic sewage treatment plants and industrial sludge produced in industries such as papermaking, leather, printing and dyeing. Background technique [0002] With the development of urbanization and the emphasis and strengthening of water environment management, the scale and degree of urban sewage treatment are increasing day by day. By the end of 2010, the scale of my country's urban sewage treatment had reached 124.76 million cubic meters per day. Sludge from urban sewage treatment plants (abbreviated as sludge) is an unavoidable by-product in the sewage treatment process, mainly from primary sedimentation tanks, secondary sedimentation tanks and other process units. per ten thousand m 3 After the sewage is treated, 5-10 tons of sludge will be produced (according to the water content of 80%). It is estimated that the current annual sludge production in my coun...

AI Technical Summary

Problems solved by technology

However, since sludge incineration produces a large amount of toxic and harmful gases (including carcinogens such as dioxins), and the effective removal and purification of these gases requires a large amount of facility investment and capital investment, this sludge disposal method faces " High operating costs and poor public acceptability" are two major challenges

Therefore, although the technology is quite mature and has many advantages, the sludge incineration technology has not been able to achieve large-scale industrial application.