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Method for quickly using urban sludge as backfill soil for construction

A technology for building land and backfilling soil, applied in filling, sludge treatment, chemical instruments and methods, etc., can solve the problem of low efficiency of sludge resource utilization, and achieve the effect of avoiding the release of heavy metal elements and improving the pore structure.

Inactive Publication Date: 2020-08-11
广东泉兴生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of comprehensive utilization efficiency, the resource utilization efficiency of the above-mentioned sludge is generally low; it is of great significance to seek a technology that can quickly dispose of sludge and utilize it as a resource

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The urban sludge used in this implementation case comes from a sludge disposal plant in Guangdong Province. The moisture content of the sludge is 77.51%. 3 Add 0.6 tons of polyferric chloride conditioner to the sludge to be treated and stir evenly, and use a plate and frame filter press to filter the sludge to obtain a filter cake with a water content of 56.65%. After the mud cake is crushed, add 3.76 tons of soft soil curing agent to the obtained broken mud cake, use an excavator to evenly mix the broken mud cake and soft soil curing agent, and spread it on the cement floor with a thickness of about 40cm. The rotary tiller turned the sludge twice to dry. After 48 hours, the moisture content of the sludge was 41.21%. The treated sludge was obtained. After the treated sludge was mixed with the natural soil at a mass ratio of 1:1, the obtained Backfill with soil.

[0025] After sampling and testing, the moisture content of the mixed soil is 24.26%. The sampling is presse...

Embodiment 2

[0031] The urban sludge used in this implementation case comes from a sludge disposal plant in Guangdong Province. The moisture content of the sludge is 82.65%. 3 Add 2 tons of polyferric chloride to the sludge to be treated and stir evenly. Use a plate and frame filter press to filter the sludge to obtain a filter cake with a moisture content of 52.84%. Use a crusher to crush the cake , add 1.8 tons of soft soil curing agent to the obtained broken mud cake, stir evenly, spread the obtained mixed material on the cement floor, with a thickness of about 50 cm, turn it over and dry it twice with a rotary tiller, and after 48 hours, the sludge moisture content It was 39.13% to obtain dried sludge. After mixing the treated sludge and natural soil at a mass ratio of 1:1, the backfill soil for construction land was obtained.

[0032] After testing, the water content of the backfill soil for the construction land obtained is 20.48%, and the sampling is pressed into a φ5x5 cylindrical ...

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Abstract

The invention relates to the technical field of sludge environment-friendly treatment, and discloses a method for rapidly using urban sludge as backfill soil for construction. The method comprises thefollowing steps: S1, adding a hardening and tempering agent into the urban sludge, and uniformly stirring to obtain hardened and tempered sludge; S2, carrying out plate-and-frame filter pressing on the hardened and tempered sludge to obtain a sludge cake; S3, crushing the filter pressing mud cake by using a crusher to obtain a crushed mud cake; S4, adding a soft soil curing agent into the crushedmud cake, and uniformly mixing to obtain cured sludge; S5, paving the cured sludge on a cement floor, and turning and airing until dried sludge is obtained; and S6, mixing the dried sludge with natural soil in proportion to obtain the backfill soil for the construction land. According to the method, heavy metal elements in the sludge can be effectively solidified while the water content of the urban sludge is reduced, the leaching concentration of heavy metal and the risk of the heavy metal to the environment are reduced, the urban sludge is effectively applied to construction land backfill soil, and the resource attribute of the urban sludge is achieved.

Description

technical field [0001] The invention relates to the technical field of sludge environmental protection treatment, in particular to a method for quickly using urban sludge as backfill soil for construction land. Background technique [0002] With the continuous improvement of my country's urbanization level and the rapid development of sewage treatment facilities, a large amount of urban sludge has also been produced. It is predicted that in 2020, the annual output of sludge with 80% water content in my country will exceed 60 million tons. Facing such a huge number, coupled with its high moisture content, sludge containing organic pollutants and heavy metal pollutants, etc., the rapid growth of sludge Effective disposal and recycling have become the focus of attention of enterprises and all walks of life. Moreover, due to the high water content of urban sludge in my country, the main energy is focused on effectively reducing the water content of urban sludge during resource t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/122C02F11/00C02F11/12E02D17/18C02F101/20
CPCC02F11/143C02F11/122C02F11/008C02F11/12E02D17/18C02F2101/20
Inventor 汪韦兴张鹏举张炎张凯李维邓钧豪雷杰妮戴薇
Owner 广东泉兴生态科技有限公司
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