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A heavy metal sludge soil remediation agent, preparation method and application in sludge digestion

A technology of soil remediation agent and heavy metal sludge, which is applied in the restoration, application, and biological sludge treatment of polluted soil. It can solve the problems of sludge digestion difficulties, eliminate potential threats to human health, and reduce water and soil pollution sources. , to avoid the effect of secondary pollution

Active Publication Date: 2020-07-24
北京绿安创华环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the difficulty of existing sludge consumption, the sludge heavy metal soil remediation agent provided by the present invention not only solves the problem of sludge disposal, but also turns waste into treasure, turning sludge into a soil remediation agent, which can repair land polluted by heavy metals

Method used

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  • A heavy metal sludge soil remediation agent, preparation method and application in sludge digestion
  • A heavy metal sludge soil remediation agent, preparation method and application in sludge digestion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation of embodiment 1 heavy metal soil remediation agent

[0051] 1. Sludge pretreatment

[0052] The domestic sludge produced by the urban domestic sewage treatment plant is piled up in the drying yard and dried for 10 to 15 days, and a biological deodorant can be added appropriately. Preliminary reduction of odor, machine dehydration and reduce the moisture content from about 75% to below 40%.

[0053] Add auxiliary materials and heavy metal deactivators to the above dried sludge, mix the above components evenly, crush them with a pulverizer or a crusher, pass through a sieve, and make sludge particles with a particle size of less than 10mm for future use.

[0054] The auxiliary material is straw: bean dregs: shale: peat: sawdust = 1: 1: 1: 1: 1, and the mass-number ratio of the auxiliary material to the sludge is auxiliary material: sludge = 1: 20;

[0055] The heavy metal deactivator is a mixture of coal ash, quicklime and perlite, and the ratio of the w...

Embodiment 2

[0073] Embodiment 2 soil remediation, only add heavy metal soil remediation agent in polluted soil

[0074] The heavy metal soil remediation agent prepared in Example 1 is applied to heavy metal contaminated land, and the application amount of the heavy metal soil remediation agent per mu is 500kg;

[0075] Pass the heavy metal soil remediation agent through a 5mm mesh sieve, use a compost turner to mix it evenly, and then evenly sprinkle it into the heavy metal-contaminated land to be repaired, use a rotary tiller to mix it with 40cm of soil on the surface of the land, and then water to adjust the soil The humidity is 60% of the saturated water holding capacity of the field, and the concentration values ​​of Zn, Pb and Cd in the bioavailable, moderately available and refractory forms in the soil are measured after natural stacking at room temperature for 60 days.

[0076] The results showed that: the soil pH value increased to 6.1; the concentrations of Zn, Pb and Cd in the bio...

Embodiment 3

[0077] Embodiment 3 Soil remediation, adding heavy metal soil remediation agent+fertilizer in polluted soil

[0078] The heavy metal soil remediation agent prepared in Example 1 is applied to heavy metal contaminated land, and the application amount of the heavy metal soil remediation agent per mu is 500kg;

[0079] The heavy metal soil remediation agent is passed through a 5mm mesh sieve, mixed evenly with the fertilizer, the weight ratio of the fertilizer and the heavy metal soil remediation agent is 1:10, and the composition of the fertilizer is: 20 parts of organic animal manure, 5 parts of humic acid, 0.4 parts of water-retaining agent, 2 parts of succinic acid, wherein the water-retaining agent is polyacrylamide.

[0080] Use a compost turner to make it evenly mixed and sprinkle it evenly into the heavy metal-contaminated land to be repaired. Use a rotary tiller to mix it with 40cm of soil on the surface of the land, and then water to adjust the soil humidity to 60% of t...

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Abstract

The invention provides a heavy metal sludge soil restorer, a preparation method and an application thereof in sludge elimination. The adopted technical scheme comprises: municipal sludge is subjected to pretreatment, thermophiles are used for decomposing organic substances, and a heavy metal is added to treat microorganisms. After the sludge restorer is used in a test, the effective removal rate of various pollutants in soil reaches 95% or above, in line with national standards. At the same time, sulfate can be used to repair heavy metal land in situ, and is also a very good organic fertilizer, and is beneficial to reduction in the use of chemical reagents and chemical fertilizers in agricultural production, thereby eliminating pollution sources and secondary pollution from the source.

Description

technical field [0001] The invention relates to a heavy metal sludge soil remediation agent, a preparation method and its application in sludge digestion, specifically a method for preparing a soil remediation agent for heavy metal pollution by using microorganisms to treat sludge, and the obtained heavy metal sludge Soil remediation agent, and its application in sludge digestion. Background technique [0002] At present, due to the long-term use of chemical fertilizers and various pesticides in the soil of agricultural land, coupled with water pollution, the content of heavy metals in the soil is complicated, which affects the agricultural performance and quality of the soil. For a long time, the search for an in-situ passivation technology for repairing soil has attracted more and more attention from relevant departments and experts. Improvement of soil quality and agricultural development in our country. [0003] Biotransformation of heavy metals by microorganisms Micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/10C02F11/12C02F11/04
CPCB09C1/10B09C2101/00C02F11/04C02F11/12C09K17/40
Inventor 王锋梁琳琳谢英轩
Owner 北京绿安创华环保科技有限公司
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