Method for co-treatment and resource utilization of urban pipe gallery sludge and polluted soil

Abstract

The invention discloses a method for co-treatment and resource utilization of urban pipe gallery sludge and polluted soil. The method comprises the following steps: pretreating the urban pipe gallery sludge; stirring the pretreated urban pipe gallery sludge and polluted soil so as to obtain mixed sludge; drying and sieving the mixed sludge to obtain dried sludge powder; uniformly mixing the sludge powder, an inorganic additive and a binder to obtain a raw material; adding water into the raw material and carrying out stirring to obtain a porous building block raw material; and preparing a porous building block from the porous building block raw material. By mixing the dried polluted soil in the urban pipe gallery sludge, water content is reduced, and drying efficiency is improved; the porous building block has more pores, is beneficial to attachment of microorganisms and can be laid at the bottom of a river channel to prevent endogenous pollution of river channel bottom mud to water quality; and after the porous building block is put into use for a period of time, the porous building block can be taken out to be dried, crushed and fired again, so recycling of resources is achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method for co-processing and resource utilization of urban utility gallery sludge and polluted soil. Background technique [0002] With the acceleration of my country's urbanization process and the improvement of sewage treatment rate, the accompanying problem of sludge harmlessness is becoming more and more serious, and the sludge environmental protection industry is about to emerge. Sludge is a product of urban development, and its treatment and disposal is an important part of regional ecological balance. Urban pipe gallery sludge generally refers to the sludge discharged from sewage treatment plants and the sludge deposited in urban drainage pipes. The sediment dredged up during the maintenance of drainage pipes is called pipe gallery sludge. Compared with sewage plant sludge, the amount of sludge in pipe gallery is small, but it has not been paid att...

AI Technical Summary

Problems solved by technology

When anaerobic digestion is used to treat sludge, a large amount of biogas will be produced, but the current domestic technology is not very mature, and the efficiency of converting organic matter in sludge into biogas is low, less than 50%, and more efficient treatment technologies still need to be developed

[0007] Contaminated soil is the waste produced by modern industrial production, which is very harmful to the environment and human health. The traditional treatment process is landfill, but it occupies too much land area and wastes resources. At present, it is necessary to seek multi-method resource utilization

[0008] The above-mentioned urban pipe gallery sludge treatment methods all have certain disadvantages. In order to meet the three principles of "harmless", "reduction", and "recycling", simultaneously treat urban pipe gallery sludge and solid waste, and realize urban Resource Utilization of Pipe Gallery Sludge and Solid Waste

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