Method for disposing sludge generated in sewage treatment plant by using earthworms

Abstract

The invention provides a method for disposing sludge generated in a sewage treatment plant by using earthworms. The method comprises the following steps: finishing the sludge into a sludge basement layer material bed ridge for culturing earthworms; putting a layer of additives on the surface of the sludge basement layer material bed ridge; putting the earthworms in the additives; covering a layer of herbaceous and woody plant waste materials on the additives with the earthworms so as to form an earthworm-edible stacking layer consisting of the sludge, the additives and the herbaceous and woody plant waste materials; treating the herbaceous and woody plant waste materials by using the earthworms so that the herbaceous and woody plant waste materials are converted into wormcast; after separating the earthworms from the wormcast, recycling the earthworms; and putting the wormcast in a sun shed for drying. In the invention, the earthworm is utilized to treat the sludge so as not to generate secondary pollution, thus the method has obvious economic benefits; and the wormcast can be used as a base material for producing an organic fertilizer and used for forest product production or as a garden fertilizer after the sludge is converted into the wormcast.

Description

technical field [0001] The invention relates to a treatment method for sludge produced by urban sewage treatment plants, in particular to a method for earthworms to dispose of sludge produced by urban sewage treatment plants. Background technique [0002] Sludge produced by global urban sewage treatment plants has become a worldwide problem. Now, China is also building a large number of urban sewage treatment plants, and with the large amount of sludge produced by sewage treatment plants, because the sludge contains various pollutants and heavy metals, it is extremely difficult to treat, which will cause environmental pollution. secondary pollution. However, the technical solutions for sludge treatment and disposal are not perfect at present, and no industry standards have been established. Local governments have to invest a lot of manpower and material resources in sludge treatment and disposal. [0003] At present, there are mainly four methods for sludge treatment and d...

AI Technical Summary

Problems solved by technology

[0004] 1. Landfill, although this method is low in cost, it will cause great pollution to the surrounding ecological environment and groundwater sources, which has been prohibited by law

[0005] 2. Incineration, because the dioxins produced in the incineration process are easily leaked from the incineration equipment, dioxins are extremely carcinogenic substances, which have a great impact on human health, and require high equipment investment and daily maintenance. maintainance fee

[0006] 3. Dry conversion, this method also requires high equipment investment and daily maintenance costs

Moreover, a large amount of sludge needs to be stacked in the open air, and the stench emitted by the sludge will seriously affect the ecological environment of the surrounding areas.

[0007] 4. Composting, this method has stricter requirements on sludge standards, usually needs to go through several processes, and also needs to build a large sludge dump, and this method is not suitable for urban sewage containing various pollutants and heavy metals. Mud, its effect is often unable to meet the national environmental protection requirements