Municipal sludge solidification ecological treatment process

Abstract

The invention discloses a municipal sludge solidification ecological treatment process. The process comprises the following steps: preparation before construction, arrangement of a stirring tank, sludge digging, foreign matter separation, sludge solidification treatment, natural maintenance, sampling detection, backfilling and greening (direct greening / earthing greening); an adopted sludge curingagent is an inorganic material; the curing mechanism is that hydrate acicular crystals are generated through hydration, and are combined with soil to form stable particle groups, so that the effect ofchanging the properties of the sludge is achieved. The sludge solidification technology is adopted, so that excellent inhibition effect on heavy metal hexavalent chromium precipitation is achieved, at the same time, other harmful substances (heavy metal ions) in object soil are immobilized, harmful bacteria, BOD, COD, phosphorus and other components polluting water in the object soil are removed,underground water / surface water quality is protected effectively, and possibility of infectious pollution of other soil is eliminated.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a municipal sludge solidification and ecological disposal process. Background technique [0002] At present, the total annual output of municipal sludge in my country has exceeded 40 million tons, and it is expected that by 2020 this figure will reach 60 million to 90 million tons. With the increase of my country's sewage treatment capacity and the increasingly stringent treatment standards, the sludge output of domestic sewage treatment plants will continue to increase. The "Water Ten Measures" clearly stated that to further promote the treatment and disposal of urban sludge, the existing sludge treatment and disposal facilities should be basically completed by the end of 2017, and the rate of harmless treatment and disposal of urban sludge at the prefecture level and above should be completed by the end of 2020. reached above 90%. [0003] At present, there are many bottleneck...

AI Technical Summary

Problems solved by technology

First of all, most large, medium and small cities across the country have built sewage treatment plants and put them into use, but there are few corresponding sludge treatment equipment; secondly, at present, large, medium and small cities across the country have introduced sewage treatment fees, but few cities have introduced sludge treatment fees Third, due to the late start of sludge disposal, the construction of sludge disposal sites has not been included in the urban planning of many cities, and it is difficult for many cities to find suitable sludge disposal methods and sludge disposal sites, and sludge is often dehydrated to 60%. The outskirts of Sinotrans are stacked in public environments such as farmland and rivers, which not only offsets the environmental protection effect of sewage treatment, but also occupies a large amount of land, causing secondary pollution

my country has no mandatory requirements for sludge treatment at the legal level, and the development of sludge treatment and disposal standards lags behind, lacking a mature commercial sludge treatment industry model

Images