Method for disposing urban sludge by using earthworms

Abstract

The invention discloses a method for disposing urban sludge by using earthworms. The method comprises the steps: incubating and feeding earthworm eggs in dehydrated urban sludge till sexual maturity; continuously feeding the robust sexual-mature earthworms in the dehydrated urban sludge; and laying eggs, continuously incubating and feeding in the sludge, domesticating circularly till the loss rate of the earthworms fed with the naturally oxidized dehydrated urban sludge is stably lower than 1%, treating the dehydrated urban sludge by using the domesticated earthworms, and converting into earthworm cast. According to the method for disposing the urban sludge by using the earthworms, the dehydrated urban sludge can gradually form microbes, enzymes and fish manure with high fused inorganic matters by using the earthworms, strong stench of the urban sludge is eliminated, the content of heavy metals is reduced, and harmlessness and recycle of the urban sludge are furthest realized. The environment-friendly requirement of human beings for sustainable utilization of the urban sludge is met.

Description

[0001] technical field [0002] The invention relates to a method for recycling sludge, in particular to a method for using earthworms to dispose of urban sludge. [0003] Background technique [0004] With the increasing attention of relevant administrative departments on water environmental pollution and treatment, and the increasingly stringent sewage discharge standards, my country's sewage treatment industry has developed rapidly in recent years. With the popularization of urban sewage treatment facilities in our country, the improvement of treatment rate and the deepening of treatment degree, the amount of sludge produced in the process of sewage treatment is also increasing day by day. The cost of sludge treatment and disposal in sewage treatment plants accounts for about 24-45% or higher of project investment and operation costs. The high investment and operating costs of sludge treatment and disposal in sewage treatment plants, on the one hand, make most of the do...

AI Technical Summary

Problems solved by technology

The traditional urban sludge treatment methods in my country mainly use sludge for agriculture, composting and landfilling. However, urban sludge contains a large number of harmful substances such as various pathogenic bacteria, insect eggs, and heavy metals, and emits strong stench. As farmland fertilizer, urban sludge will directly cause serious environmental pollution. Even if urban sludge is treated by composting, although it can reduce the hazards of various pathogenic bacteria, insect eggs and other biological substances, it still cannot eliminate heavy metals and other pollutants. the harm of

Landfilling urban sludge only delays the time of urban sludge pollution. Harmful substances and strong stench in urban sludge will eventually enter the cycle of air and water resources, causing serious environmental pollution. endanger human beings

In order to make municipal sludge harm the environment as little as possible, the alternative method of treating municipal sludge is mainly incineration, but the calorific value of combustibles in municipal sludge is low, and incineration is used to treat municipal sludge It will consume a lot of energy, and the incineration process will inevitably produce highly stable and highly toxic substances such as dioxins, which will cause secondary pollution to the environment

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