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Method for treating heavy metal sludge of sewage treatment plant by using earthworm

A sewage treatment plant, heavy metal sludge technology, applied in water/sludge/sewage treatment, biological sludge treatment, chemical instruments and methods, etc., can solve complex procedures, increase the cost of heavy metal sludge, and can no longer continuously add heavy metals Sludge and other problems, to achieve the effect of simple process

Active Publication Date: 2012-09-05
张丽 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing method of treating sludge containing heavy metals uses chemical products as a fixative, and the amount of heavy metal sludge that needs to be treated increases sharply every day, and the corresponding chemical products required also increase sharply every day. Not only the purchase of chemical products increases the cost of heavy metal pollution The cost of sludge, and it is necessary to accurately grasp the type and content of heavy metals contained in the sludge in order to adjust the formula and dosage when dealing with heavy metal sludge. The process is relatively complicated, and it is difficult for ordinary technicians to master
In addition, heavy metal sludge that needs to be treated cannot be added continuously during the production process, which is not conducive to large-scale continuous treatment of heavy metal sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: in the present embodiment, the method for processing the heavy metal sludge of sewage treatment plant with earthworms is characterized in that it is carried out according to the following steps:

[0018]a. Choose an open space close to the water source, convenient for drainage, no water accumulation, good ventilation performance, and far away from noise interference to prepare the earthworm bed; the earthworm bed is 50 meters long, 1.5 meters wide, and 80 mm thick. The base layer of the earthworm bed adopts anti-seepage treatment Drainage ditches are set around the earthworm bed, with a drainage slope of 8‰, which is naturally drained by gravity; the drainage across the machine-cultivated road is crossed by reinforced concrete pipes to ensure the safety and smoothness of the drainage system; the upper part of the earthworm bed adopts a scaffolding structure and a plastic roof Rainproof, heat preservation, and sunshade; the middle part of the earthworm bed i...

Embodiment 2

[0023] Embodiment 2: in the present embodiment, the method for processing the heavy metal sludge of sewage treatment plant with earthworms is characterized in that it is carried out according to the following steps:

[0024] a. Choose an open space close to the water source, convenient for drainage, no water accumulation, good ventilation performance, and far away from noise interference to prepare the earthworm bed; the earthworm bed is 50 meters long, 1.5 meters wide, and 150 mm thick. The base layer of the earthworm bed adopts anti-seepage treatment Drainage ditches are set around the earthworm bed, with a drainage slope of 8‰, which is naturally drained by gravity; the drainage across the machine-cultivated road is crossed by reinforced concrete pipes to ensure the safety and smoothness of the drainage system; the upper part of the earthworm bed adopts a scaffolding structure and a plastic roof Rainproof, heat preservation, and sunshade; the middle part of the earthworm bed...

Embodiment 3

[0029] Embodiment 3: in the present embodiment, the method for processing heavy metal sludge in sewage treatment plants with earthworms is characterized in that it is carried out according to the following steps:

[0030] a. Choose an open space close to the water source, convenient for drainage, no water accumulation, good ventilation performance, and far away from noise interference to prepare the earthworm bed; the earthworm bed is 50 meters long, 1.5 meters wide, and 100 mm thick. The base layer of the earthworm bed adopts anti-seepage treatment Drainage ditches are set around the earthworm bed, with a drainage slope of 8‰, which is naturally drained by gravity; the drainage across the machine-cultivated road is crossed by reinforced concrete pipes to ensure the safety and smoothness of the drainage system; the upper part of the earthworm bed adopts a scaffolding structure and a plastic roof Rainproof, heat preservation, and sunshade; the middle part of the earthworm bed is...

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Abstract

The invention relates to a method for treating heavy metal sludge of a sewage treatment plant by using earthworms, comprising the following steps of: a, making an earthworm bed, wherein a basic layer of the earthworm bed adopts anti-seepage treatment; b, inoculating larval earthworms on the earthworm bed; c, feeding feed on the inoculated earthworm bed to form a feed seizing layer, wherein a feedfeeding mode comprises the following steps of: firstly feeding fresh sludge of the sewage treatment plant, feeding organic matters which occupy one ten of the total amount of the fresh sludge after the fresh sludge is consumed by the earthworms in about 1-2 months, and repeatedly feeding the feed when the organic matters are consumed; and d, collecting adult earthworms and worm-cast after about 50 days. The method has simple processes and can continuously treat heavy metal sludge in a large scale.

Description

technical field [0001] The invention relates to a method for treating heavy metal sludge in a sewage treatment plant with earthworms. Background technique [0002] Now the sewage treatment plant produces a large amount of sludge every day. The sludge of the sewage treatment plant is the sedimentary material and the scum on the surface of the sewage produced during the purification process of urban domestic sewage and industrial wastewater. It is a solid-liquid mixture. There is no external force. Under the action, its solid-liquid ratio is relatively stable. According to the process of sewage treatment, sludge can be divided into primary sedimentation sludge, humic sludge, remaining activated sludge and digested sludge. With the acceleration of urbanization in my country, the rate of urban sewage treatment has increased year by year, and the sludge output of urban sewage treatment plants has also increased sharply. Untreated sludge entering the environment will directly ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F101/20
Inventor 张丽申健赵修杰
Owner 张丽