Sludge treatment method

Abstract

The invention discloses a method for coupling sludge drying and carbonizing based on organisms. The method comprises the steps of S1, adding original sludge from a sewage plant into a flocculating agent which accounts for 1-3%o of the oven-dry weight of the sludge for concentration, and using a belt filter press to filter-press the concentrated sludge to obtain filter cake and a filtrate; S2, adding pulverized straw of which the moisture content is 10-35% into the filter-cake sludge obtained in S1, fully mixing the materials to obtain a mixture, and draining the obtained filtrate to the sewageplant for treatment, wherein the mixing ratio of biomass of the sludge to biomass of the pulverized straw is (2-4):1; S3, adding a microbial agent which accounts for 3-6%o of the oven-dry weight of the mixture into the mixture obtained in S2 for mixing, and fermenting and drying a to-be-dried material pile obtained after mixing to obtain biological dried sludge; S4, placing the biological dried sludge obtained in S3 into a carbonizing furnace for carbonization for 20-40 min to obtain carbonized sludge, and conducting pyrolysis to obtain gas and distilled oil; activating the obtained carbonized sludge, afterwards, mixing the carbonized sludge back into a sludge biological drying and fermenting bin for mixed fermenting, introducing the obtained pyrolysis gas and oil into an incinerator or asecondary combustion chamber of an incinerator system for combustion, and then introducing combusted exhaust gas into the carbonizing furnace.

Description

technical field [0001] The invention relates to the field of sludge treatment and disposal, in particular to a technology based on sludge biological drying coupled with pyrolysis and carbonization. Background technique [0002] Municipal sludge contains high moisture content and rich organic matter, and at the same time, sludge contains a certain amount of heavy metals, pathogenic bacteria, parasite eggs, etc. If it is not disposed of properly, it will inevitably cause secondary pollution and seriously affect the surrounding ecological environment. Under the "new normal" of the environmental protection industry, my country has successively promulgated a series of national policies and industry standards. Among them, the "Water Ten Rules" promulgated in 2015 clarified that the existing sludge treatment and disposal facilities should be basically completed before the end of 2017. The rate of harmless treatment and disposal of municipal sludge at and above the national level sho...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the main technical problem to be solved by the present invention is to provide a sludge treatment and disposal method, which utilizes the energy generated by microbial aerobic fermentation to drive the water transfer and evaporation of the sludge matrix, and then the biological After the sludge is pyrolyzed and carbonized, the carbon-based sludge after acidification is mixed back into the sludge fermentation tank for fermentation and drying, which can solve the high cost, high energy consumption, and easy generation of sludge treatment and disposal in the prior art. Technical problems such as secondary pollution and complicated process routes

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