Sewage treatment sludge recycling device and method

Abstract

The invention provides a sewage treatment sludge recycling device and method. The device comprises a supporting frame and an earthworm breeding cabin, wherein the earthworm breeding cabin is fixed above the supporting frame; the earthworm breeding cabin comprises a cabin body, a cabin cover, a lighting assembly and a discharging assembly; the discharging assembly comprises a metal screen, a vibrating motor used for driving the metal screen to swing and a discharging bottom plate; nail-shaped protrusions are evenly distributed on the upper surface of the metal screen, cylinders are evenly distributed on the lower surface of the metal screen, round holes for the cylinders to be inserted into are evenly distributed on the discharging bottom plate, a steam channel is arranged in the discharging bottom plate, and a stirring device is arranged below the earthworm breeding cabin. According to the sewage treatment sludge recycling device disclosed by the invention, the characteristics of photophoby and heat intolerance of earthworms are utilized, and the earthworms are utilized to treat sludge and heavy metal in the sludge; furthermore, heating of the discharging bottom plate is utilized to kill germs and eliminate peculiar smell; after the sludge is treated by the earthworms, the sludge is mixed with other useable waste to be applied to agricultural fertilizers; thus, sludge resourcesare recycled, environmental protection is achieved, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of sludge utilization, in particular to a device and method for recycling sludge after sewage treatment. Background technique [0002] With the development of my country's social economy and the improvement of urbanization level, the sludge output of urban sewage plants in my country has increased rapidly. It is estimated that the sludge output (80% moisture content) in my country in 2011 exceeded 30 million tons, and the disposal of sludge should follow the " According to the four principles of reduction, harmlessness, stabilization, and resource utilization, the main methods of sludge disposal at home and abroad include landfill, incineration, composting, and resource utilization, etc. Landfill technology has low treatment costs, but It occupies a large area, and the landfill gas and leachate are large and difficult to deal with. The incineration technology has a significant capacity reduction effect, and t...

AI Technical Summary

Problems solved by technology

[0002] With the development of my country's social economy and the improvement of urbanization level, the sludge output of urban sewage plants in my country has increased rapidly. It is estimated that the sludge output (80% moisture content) in my country in 2011 exceeded 30 million tons, and the disposal of sludge should follow the " According to the four principles of reduction, harmlessness, stabilization, and resource utilization, the main methods of sludge disposal at home and abroad include landfill, incineration, composting, and resource utilization, etc. Landfill technology has low treatment costs, but It occupies a large area, and the landfill gas and leachate are large and difficult to deal with

The incineration technology has a significant capacity reduction effect, and the calorific value of the sludge can be utilized, but the operating cost is high, and there is a problem of secondary air pollution

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