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...

Examples

Embodiment Construction

[0028] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0029] The current national standards for the discharge of pollutants from urban sewage treatment plants stipulate that the sludge discharged from urban sewage treatment plants must be dehydrated, and the moisture content of the dehydrated urban sludge should be less than 80%. The dehydrated urban sewage involved in this application Sludge refers to urban sludge discharged from urban sewage treatment plants that meets the above standards.

[0030] like figure 1 Shown, the present invention handles the method for dewatered municipal sludge as figure 1 shown.

[0031] A method of utilizing earthworms to dispose of urban sludge of the present invention comprises the following steps:

[0032] Step 1: Select suitable earthworm species according to the composition characteristics of the dehydrated urban sludge after natural oxidation; put the eggs of the e...

[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...

Examples

Embodiment Construction

[0028] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0029] The current national standards for the discharge of pollutants from urban sewage treatment plants stipulate that the sludge discharged from urban sewage treatment plants must be dehydrated, and the moisture content of the dehydrated urban sludge should be less than 80%. The dehydrated urban sewage involved in this application Sludge refers to urban sludge discharged from urban sewage treatment plants that meets the above standards.

[0030] like figure 1 Shown, the present invention handles the method for dewatered municipal sludge as figure 1 shown.

[0031] A method of utilizing earthworms to dispose of urban sludge of the present invention comprises the following steps:

[0032] Step 1: Select suitable earthworm species according to the composition characteristics of the dehydrated urban sludge after natural oxidation; put the eggs of the e...

Images