Treatment method for solidifying sludge of sewage plant in city

Abstract

This invention relates to a method for solidification treatment of sludge discharged from urban sewage treatment plant. The method utilizes solidification and stabilization techniques to treat sludge discharged from urban sewage treatment plant, and improve its landfill physicochemical properties, thus can solve the problems related to sludge landfill. The method adopts cement as the solidification agent, and one or more of lime, aluminum salt, aluminum oxide and cinder as the coagulant aid. The method comprises: adding 3-8% solidification agent and 1-8% coagulant aid into sludge, mechanically stirring uniformly, spreading onto a landfill site, covering with a waterproof film, dry-maintaining for 3-15 days, and performing following landfill. The method has such advantages as low cost, easy operation and good effect. The treated sludge has such advantages as high compressive strength, high soaking resistance and low leaching toxicity.

Description

technical field [0001] The invention relates to a solidification treatment method for urban sewage plant sludge. The treated sludge can improve the physical and chemical properties of sludge landfill and facilitate sludge landfill treatment, and belongs to the technical field of environmental engineering. Background technique [0002] At present, the main means of sludge disposal in urban sewage treatment plants include landfill, land utilization, incineration and utilization of building materials. Among them, the cost of landfill disposal is relatively low, and the operation is relatively simple, so it is widely used. However, there are many problems in the sanitary landfill process of sludge. For example, the physical properties of dewatered sludge are often difficult to meet the soil mechanics requirements of the landfill; In some areas, especially in the rainy south of my country, the sludge in the sludge landfill even becomes a liquid concentration pool; The filtrate fl...

AI Technical Summary

Problems solved by technology

However, there are many problems in the sanitary landfill process of sludge. For example, the physical properties of dewatered sludge are often difficult to meet the soil mechanics requirements of the landfill; In some areas, especially in the rainy south of my country, the sludge in the sludge landfill even becomes a liquid concentration pool; The filtrate flows out, thus, the sludge landfill greatly affects the environmental quality of the landfill

For this reason, sludge landfills at home and abroad often need to add a large amount of filler materials such as sand and soil to the sludge during the sludge landfill process, but this not only greatly increases the cost of sludge landfill, but also Also reduces the utilization of the effective volume of the landfill

[0003] In the solidification of sludge, there have been references to the treatment methods of river bottom mud, etc., to solidify the urban sludge, but because the organic matter content in the sludge of the urban sewage plant is often as high as 52% (mass ratio), the pollution is greatly increased. It is difficult to solidify the sludge, so it is difficult to make the transverse shear strength of the sludge reach 25kN / m 2 The above practical application requirements