Method for treating municipal sewage plant surplus sludge with earthworms

A technology for excess sludge and urban sewage, applied in energy wastewater treatment, biological sludge treatment, application and other directions, can solve the problems of earthworm suffocation and death, high water content, poor air permeability, etc., achieving significant economic benefits, low production cost, The effect of reducing the cost of feed

Inactive Publication Date: 2013-05-08
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, although there have been many experimental research results on the use of earthworms to treat excess sludge in sewage plants, the excess sludge in urban sewage plants has a large water content, dense sludge, and poor air permeability. Earthworms, easy to cause earthworms to suffocate and die

Method used

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  • Method for treating municipal sewage plant surplus sludge with earthworms
  • Method for treating municipal sewage plant surplus sludge with earthworms
  • Method for treating municipal sewage plant surplus sludge with earthworms

Examples

Experimental program
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Embodiment

[0017] (1) Make a simple earthworm breeding bed such as figure 1 As shown, the bed body is a plastic basket with length × width × height = 50 × 35 × 30 (cm); the four walls and the bottom have dense and uniform ventilation holes with a diameter of 0.6 cm, and the bottom is overhead, 6 cm above the ground The earthworm breeding bed is divided into four layers from bottom to top: dry straw layer, lower layer of filter mud, cow dung or pig manure layer and upper layer of filter mud. There are 5 plans to configure each bed layer, and the ratio of each layer of the bed layer See Table 1 for the distribution of earthworms.

[0018]

[0019] (2) Throw earthworms into the breeding bed. Earthworms live in the earthworm breeding bed composed of dry rice straw, sludge, cow dung or pig manure for earthworms to eat. The temperature in the earthworm breeding bed is controlled at 25°C, and the earthworms enter the breeding In the first week of the bed, water once every 2 days, after the ...

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Abstract

The invention discloses a method for treating municipal sewage plant surplus sludge with earthworms, which comprises the following steps: (1) making a simple earthworm cultivation bed of which the four walls and bottom are provided with vent holes, wherein the earthworm cultivation bed is divided into a dry straw layer, a lime sludge lower layer, a cattle manure or pig manure layer and a lime sludge upper layer from bottom to top; (2) putting earthworms into the cultivation bed, and standing for 21 days while controlling the temperature in the earthworm cultivation bed at 15-30 DEG C, thereby converting dry straws, sludge and cattle manure or pig manure into earthworm manure; and (3) after the sludge is completely decomposed by the earthworms, pouring all the material in the cultivation bed onto a screen, and separating the earthworms, earthworm manure and undecomposed straws, wherein the little earthworms are recycled, and the earthworm manure is dried under the sun or with a drying apparatus. The invention has the advantages of energy saving, environmental protection and low manufacturing cost, is simple to operate, and has obvious economic benefits. The sludge can be used as a fertilizer required by production in agriculture and forestry after being converted into the earthworm manure.

Description

technical field [0001] The invention relates to a method for treating excess sludge in sewage plants, in particular to a method for treating excess activated sludge in urban sewage plants by using earthworms. Background technique [0002] With the continuous increase in the number and scale of urban (town) sewage treatment plants in our country, the surplus activated sludge output of sewage treatment plants is increasing. At present, the operation process of concentration-filtration-transportation (hereinafter referred to as "filter sludge") is used to dispose of the remaining activated sludge in sewage plants. The era of using filter sludge as fertilizer has become history due to heavy metal pollution. Although disposal methods such as burial and incineration are also very effective, they also impose a great burden on sludge disposal because they need to occupy a large amount of land or consume energy. With the increasing popularity of sewage treatment plants in small town...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02A01K67/033C05F3/00
CPCY02A40/20Y02W10/37
Inventor 刘康怀龙飞李艳红
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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