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Bacterial strain and process for improving humus soil of refuse landfill into greening planting soil

A technology for landfill and humus, applied in planting substrates, soil conditioning materials, applications, etc., can solve the problems of narrow soil range, long treatment cycle, long cycle, etc., to avoid biological hazards and reduce leaching concentration. , the effect of fast growth

Active Publication Date: 2022-02-25
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of using a curing agent to stabilize heavy metals is applicable to a narrow range of soil and is expensive
Moreover, the commonly used curing agent cement will have the problem of increasing the volume ratio, and the use of curing agent fly ash will easily cause secondary pollution, and the long-term curing effect of the curing agent is unstable
[0007] The above-mentioned stabilization methods for heavy metal soils are not suitable for the stabilization treatment of greening planting soil due to high cost, long treatment cycle, or damage to the nutrient composition of humus soil.
Some researchers have used microorganism-plant joint restoration method to stabilize heavy metals in humus soil. The microorganisms are microbial strains commonly used in MICP technology, and the stabilization effect is not ideal. Plants have selective absorption of heavy metals in humus soil, and the cycle is relatively short. Long, there is a risk of heavy metal leaching and migration during the treatment process to pollute the environment

Method used

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  • Bacterial strain and process for improving humus soil of refuse landfill into greening planting soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Sampling, heavy metal testing and pretreatment of humus soil

[0051] The test humus was excavated and screened from Woqishan Landfill in Wenzhou City, Zhejiang Province. The humus has been buried for more than 25 years, with a particle size of ≤15mm. It is stable in degradation. Yellow-black. Through relevant tests, the total amount of heavy metals in the humus soil is as follows: Cd is 69.240mg / kg, Cr is 291.252, Pb is 350.640mg / kg, Cu is 375.282mg / kg, Zn is 1489.743mg / kg, Ni is 57.750 mg / kg; the leaching concentration of each heavy metal (<2mm particle size) is: Cd is 0.3240mg / L, Cr is 0.3420mg / L, Pb is 0.3574mg / L, Cu is 2.6480mg / L, Zn is 2.5210mg / L , Ni is 0.4312mg / L. The leaching concentration of heavy metals is much higher than the water quality level IV standard of the "Environmental Quality Standards for Surface Water" (GB 3838-2002), and direct resource utilization will cause secondary pollution.

[0052] The humus soil is pretreated according to the meth...

Embodiment 2

[0068] 1. Sampling, heavy metal testing and pretreatment of humus soil

[0069] The test humus was excavated and screened from Woqishan Landfill in Wenzhou City, Zhejiang Province. The humus has been buried for more than 25 years, with a particle size of ≤15mm. It is stable in degradation. Yellow-black. Through relevant tests, the total amount of heavy metals in the humus soil is as follows: Cd is 69.240mg / kg, Cr is 291.252, Pb is 350.640mg / kg, Cu is 375.282mg / kg, Zn is 1489.743mg / kg, Ni is 57.750 mg / kg; the leaching concentration of each heavy metal (<2mm particle size) is: Cd is 0.3240mg / L, Cr is 0.3420mg / L, Pb is 0.3574mg / L, Cu is 2.6480mg / L, Zn is 2.5210mg / L , Ni is 0.4312mg / L. The leaching concentration of heavy metals is much higher than the water quality level IV standard of the "Environmental Quality Standards for Surface Water" (GB 3838-2002), and direct resource utilization will cause secondary pollution.

[0070] The humus soil is pretreated according to the meth...

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Abstract

The invention discloses a bacterial strain and a process for improving humus soil of a refuse landfill into greening planting soil. According to the invention, the high-efficiency urease-producing strain is separated and preferably obtained from humus soil which is stably degraded and is excavated and screened in a domestic waste landfill, heavy metals in the humus soil are stabilized by using the strain, and the humus soil is improved into green planting soil. The microorganism of the strain has congenital environmental adaptability, is higher in growth, reproduction and urease activity compared with other foreign strains, reduces the threat of foreign organisms, and is environment-friendly; the leaching toxicity of the treated humus soil reaches the water quality standard, and the humus soil can be used as greening planting soil; and a technical process is simple, low in cost and wide in application.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of urban solid waste, and in particular relates to a method for stably treating heavy metals in the humus with the urease-producing bacteria Brucella oryzae 2-9 separated and screened from the humus of stale garbage in domestic waste landfills craft. Background technique [0002] With the continuous development of the times, the capacity of many sanitary landfills built in the 1990s in my country (such as Shenzhen Xiaping, Hangzhou Tianziling, Shanghai Laogang, etc.) is close to saturation, and it is difficult to find suitable new landfill sites. We are facing the need to excavate and increase the capacity of the stale garbage that was landfilled in the early stage to prolong its service life, and to cover and restore the ecological restoration of the landfill in the later stage. About 40-70% of the fine-grained humus soil after the excavation of stale waste has the characteristics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C12N1/02C09K17/14A01G24/20A01G24/28C12R1/01
CPCC12N1/02C09K17/14A01G24/20A01G24/28
Inventor 陈萍邱鈺峰詹良通郭淇萌郑康琪徐辉
Owner ZHEJIANG SCI-TECH UNIV
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