Method for adjusting and treating municipal residual sludge by using salinferous brine or seawater

Abstract

The invention relates to a method for adjusting and treating municipal residual sludge by using salinferous brine or seawater, belonging to the technical field of environment engineering. The essential of the method is that a certain amount of salinferous brine or high-salinity seawater is added into the sludge with the moisture content of 99 percent; the volume ratio of the sludge and the high-salinity brine or seawater as a conditioner is 1:1-1:2; the moisture content of the sludge is reduced in free water and in the form changing process of the sludge floc, thereby the pretreatment requirement before the sludge is treated is met, and the requirement that the moisture content of the municipal sludge after pretreatment is 80 percent is satisfied; and then the pretreated sludge can be treated in other approaches such as landfill, burning or agricultural use and the like. The invention has simple process as well as convenient and feasible operation.

Description

technical field [0001] The invention relates to a method for regulating and treating municipal surplus sludge with salt-producing brine or seawater, and belongs to the technical field of environmental engineering. Background technique [0002] With the development and progress of the society, people's awareness of the protection and improvement of the living environment has been continuously enhanced, and the national environmental protection laws and regulations have been continuously improved, and the sewage treatment volume and treatment rate have been greatly improved nationwide. However, as a by-product of sewage treatment, the generation of sludge accounts for about 0.3% to 0.5% of the sewage treatment volume. If the sludge is further treated, the sludge production will continue to increase by 0.5 to 1 times. At present, the annual output of sludge from urban sewage plants in my country is about 800,000 to 1,400,000 tons (calculated with a moisture content of about 97%...

AI Technical Summary

Problems solved by technology

From the perspective of the cost of sludge disposal, the infrastructure cost of sludge treatment and disposal accounts for about 24% to 35% of the total infrastructure cost of the sewage plant, and the disposal cost accounts for about 20% to 50% of the operation cost of the whole plant, which is expensive.

[0003] However, in terms of sludge dehydration treatment, PAM (polyacrylamide) flocculant is generally used in China to treat sludge, so that the water content is reduced to about 80% before treatment. Due to the high price of PAM, sludge The treatment makes some small sewage plants unbearable

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