Mechanical deep dehydration, biological desiccation and reclamation combined treatment process for sewage sludge

Abstract

The invention relates to a treatment technology for combination of mechanical deep dehydration of sludge, biological drying and resource utilization, which consists of three parts of mechanical deep dehydration of the sludge, biological drying and resource utilization. The treatment technology comprises the following steps: firstly, dirty and wet sludge is subjected to dehydration by the mechanical method through a diaphragm high-pressure plate and frame filter press, and the water content is reduced to less than 65 percent; secondly, the sludge which is subjected to mechanical dehydration is dried by using biological energy, and the water content of the sludge is reduced to between 30 and 35 percent again; and finally, dried sludge after dehydration is used for producing fertilizer and building materials, wherein the production of the fertilizer adopts the compound fertilizer producing technique, that is, the dried sludge is subjected to nutrition adaptation, granulation, drying and bagging; and the production of the building materials adopts the sintering technique, that is, the dried sludge is subjected to mixture, green brick briquetting, drying and sintering. High-temperature flue gas generated during brick baking is utilized by a waste heat boiler, and tail gas is treated and exhausted after reaching the standards. The three working procedures of the technology are organically combined and conditional mutually, and the technology realizes reduction, innoxiousness and stability of the sludge, and simultaneously creates economic benefit.

Description

technical field [0001] The invention belongs to a sludge treatment process in the field of environmental protection, in particular to a treatment process combining sludge mechanical deep dehydration, biological drying and resource utilization. The English abbreviation of the Chinese name of the present invention is 3M (Mechanical-dewatering Microbial-drying Multi-utilization) Background technique [0002] In recent years, with the continuous improvement of my country's urban sewage treatment rate, the sludge production has also increased significantly. In 2004, the total domestic sludge production (water content 80%) reached 12.2 million tons, and by 2015 the sludge production will reach 35.6 million tons. How to scientifically and rationally dispose of such a large amount of sludge has become a major problem facing our country. [0003] Activated sludge in urban sewage treatment plants is an aggregate composed of bacterial micelles formed by various microorganisms and orga...

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Problems solved by technology

[0007] At present, the sludge drying technology mainly adopts the thermal drying method, but the thermal drying method consumes too much energy and is extremely uneconomical, so it is difficult to adopt in actual projects

Biological drying is the most economical sludge drying method, but the operating conditions of t

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