Method for preparing environmentally friendly material by sludge low-temperature carbonization

Abstract

The invention discloses a method for preparing an environmentally friendly material by sludge low-temperature carbonization. The method directly solves the problem of final treatment on sludge produced by an urban sewage treatment plant. The method utilizes ramie stick and through integrated sludge crushing, drying, stirring mixing with added ramie stick and carbonization, the environmentally friendly material is prepared. The environmentally friendly material has novel environmentally-friendly product purposes such as filtration and adsorption. The method has simple processes, a low investment cost and no secondary pollution, solves the problem that the sludge landfill land occupation area is large, the damage on the ecological environment and human health is produced and a burning cost is high, and realizes sludge quantitative reduction, stabilization, harmlessness and recycling.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, and more specifically relates to a method for preparing environmentally friendly materials by low-temperature carbonization of sludge produced in urban sewage treatment plants, which has simple process, low investment cost and no secondary pollution. Background technique [0002] With the rapid development of my country's socialism and the advancement of urbanization, the consumption of urban domestic water is increasing, and the amount of sewage that follows is increasing rapidly, which brings heavy pressure to the environment. For this reason, the country has built urban sewage treatment plants to improve the environment, and the efficiency of sewage treatment has increased rapidly. By the end of 2009, 1,993 sewage plants had been built nationwide, with a total treatment capacity of more than 100 million m 3 / d, 2,360 urban sewage plant projects are under construction, and the new sew...

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Problems solved by technology

[0004] At present, the harmless disposal rate of sludge from urban sewage treatment plants in my country is low, and the disposal methods are as follows: after dehydration, it is directly transported to landfill for landfill, which is difficult to operate, and the leachate will cause re-pollution to the environment; incineration , high heat source consumption, high investment and operation costs; agricultural compost, the disadvantage is that the harmlessness is not thorough enough, heavy metals are easy to accumulate, and it occupies a large area, and the cycle is long; as building materials, there are defects in the process, and the problem of odor nuisance, etc.

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