Organic treatment method of sludge

Abstract

The invention discloses an organic treatment method of sludge. Firstly, wet sludge is dewatered until the moisture content of the sludge is reduced to 60%-65%; then, dewatered sludge is transported to a digestive treatment tank to be crushed and sieved, and a deodorant is sprayed during crushing and sieving; a carbon source / nitrogen source proportion modifier, an oxygen slow-release agent and a material containing beneficial strains are added; the obtained material is uniformly mixed and conveyed to an aerobic digestion bin for an aerobic digestion composting reaction of the sludge, and organic soil is obtained. With the adoption of the organic treatment method of the sludge, a large amount of moisture contained in the sludge and odors can be removed, harmful substances can be killed, and a foundation is laid for sludge for agriculture or forestry or other resource application.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to the resource utilization of sludge, in particular to a sludge organic treatment method. Background technique [0002] In the process of sewage treatment in urban sewage plants, a large amount of sludge will be produced. The sludge contains many parasites, pathogenic bacteria and toxic metals, and will emit a large amount of toxic gases and foul odors. If the sludge is not properly treated, It is very easy to cause secondary pollution, and the rapid spread of pathogenic bacteria and parasites will destroy the surrounding ecological environment. [0003] At present, the methods of sludge treatment mainly include sludge incineration, sanitary landfill, and land utilization. Sludge incineration is to use the high organic content of sludge (accounting for about 70% to 80%), and has a certain calorific value to treat sludge; the advantage of sludge incineration technolog...

AI Technical Summary

Problems solved by technology

Sludge incineration is to use the high organic content of sludge (accounting for about 70% to 80%), and has a certain calorific value to treat sludge; the advantage of sludge incineration technology lies in its thoroughness of treatment, reduction rate It can reach about 95%, the treatment speed is fast, the organic matter in the sludge is completely oxidized, and the heavy metals (except mercury) are almost completely trapped in the ash; the problems of sludge incineration are: (1) The calorific value of sludge is low, At the same time, it is difficult to remove the inner moisture of the sludge, which affects the combustion stability. (2) The sludge incineration is easy to cause secondary pollution and produce harmful substances such as dioxins. (3) The cost of incineration is very high. From the perspective of foreign countries, incineration Investment, operation and maintenance costs are 2 to 4 times that of other processes

[0007] At present, the method of making sludge into organic fertilizer or soil conditioner is as follows: firstly, the wet sludge from the anhydrous treatment plant is mixed with straw fly ash, stalks, peanut shells or sawdust, etc., and the moisture content is adjusted to 60% %, and then transported to the fermentation field for fermentation. Although the purpose of reducing the moisture content in the sludge is achieved by adding auxiliary materials, the volume and weight of the sludge are greatly increased, which is not only inconvenient for transportation, but also dripping occurs during transportation. It also causes certain pollution to the environment, and greatly increases the fermentation volume and prolongs the fermentation time, which leads to the extension of the entire sludge treatment cycle and the increase of investment costs.

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