Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Biological leaching-biological stabilization combined treatment method for heavy metal polluted soil

A technology for biological leaching and polluted soil, applied in the field of soil remediation, can solve problems such as residual chemical reagents, and achieve the effects of good treatment effect, less secondary pollution and low operating cost

Inactive Publication Date: 2019-02-01
湖南新九方科技有限公司
View PDF8 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that in the prior art, simply using sulfate-reducing bacteria to remediate heavy metal soil, there is a need to continuously add carbon sources, and the combination of chemical leaching and bioremediation easily leaves chemical reagents in the soil. The present invention provides a biological Combined method of leaching and biostabilization for treating heavy metal polluted soil

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for the combined treatment of heavy metal contaminated soil by biological leaching and biological stabilization. The steps include:

[0038] (1) Add water to heavy metal contaminated soil to obtain a mud-water mixture;

[0039] (2) After adding ferrous salt to the muddy water mixture of step (1), inoculate Thiobacillus acidophilus bacterial solution for biological leaching;

[0040] (3) Separate the mud-water mixture treated in step (2) to obtain leaching liquid and sludge, respectively inoculate the leaching liquid and sludge with sulfate-reducing bacteria liquid and perform constant temperature water bath shaking treatment.

[0041] The solid content of the mud-water mixture in step (1) is 1-10%.

[0042] The ferrous salt in step (2) is ferrous sulfate or ferrous nitrate, the addition amount of the ferrous salt is 1-15%, and the inoculation amount of the acidophilus thiobacillus broth is 5 of the mass of the muddy water mixture. ~15%, the time of the biological leachi...

Embodiment 2

[0046] Using the method provided by the present invention, a heavy metal contaminated soil sample was processed. The sample was taken from a channel 0-20cm surface sludge in Qingshuitang Industrial Zone, Zhuzhou City, Hunan Province. Cu, Cr, and Pb in the sludge were all made of HF-HNO 3 -HClO 4 Digestion, the concentration of Cu, Cr, Pb in the digestion liquid was measured by inductively coupled plasma emission spectrometry, and the results are shown in Table 1.

[0047] Table 1 Cu, Cr, Pb concentration

[0048] element

Content (mg / kg)

Cu

69.4

Cr

74.6

Pb

128.4

[0049] The specific processing steps for heavy metal contaminated soil samples are:

[0050] (1) Break up the large sample in the sludge, place it in a cool, dry condition and air dry naturally, remove the rocks, rhizomes and other debris, and pass through a 2mm sieve for use;

[0051] (2) After sterilizing the test sludge by radiation, use sterile distilled water to prepare a mud-water mixture with a solid content of 2%;...

Embodiment 3

[0057] The preparation of the test sludge sample and the inoculum of Thiobacillus ferrooxidans and ferrous sulfate reducing bacteria is the same as in Example 2.

[0058] After sterilizing the test sludge by radiation, use sterile distilled water to prepare a sludge solution with a solid content of 5%: add FeSO 4 ·7H 2 O as a substrate to the soil solution, Fe 2+ The content reaches 6g / L, the inoculation quality is 8% of the mass of the soil solution, and the inoculum of Thiobacillus ferrooxidans is shaken cultured at 150rpm and 30°C. Take it out after 48h, detect the content of Cu, Cr, Pb in the supernatant, the removal rate is greater than 45%, and then inoculate 12% sulfate-reducing bacteria solution into the treated sludge, and keep the temperature at 30℃ and 180rpm. The water bath was shaken for 40 hours and taken out after biological stabilization treatment. The conversion rate of heavy metals in the supernatant was detected to be greater than 90%. The continuous extraction ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a biological leaching-biological stabilization combined treatment method for heavy metal polluted soil. The method comprises the following steps of firstly adding water into theheavy metal contaminated soil to obtain a mud-water mixture, then adding ferrous salt into the mud-water mixture, inoculating an acidophilic thiobacillus bacterium solution for biological leaching, then separating the mud-water mixture subjected to biological forest filtration treatment so as to obtain a leaching solution and sludge; and inoculating a sulfate reducing bacterium solution into theleaching solution and the sludge respectively, and carrying out constant-temperature water bath treatment. The biological leaching-biological stabilization can effectively remove heavy metals Cu, Cr,Pb and the like in the soil, the treatment effect and the environmental benefit are obviously higher than that of a chemical leaching treatment mode, compared with by utilizing the separate biologicalleaching technology and the biological characteristics of the sulfate reducing bacteria, heavy metal polluted bottom mud is treated by utilizing the biological characteristics of the biological leaching combined sulfate reducing bacteria, and low in operation cost, small in secondary pollution and better in treatment effect.

Description

Technical field [0001] The invention belongs to the technical field of soil restoration, and specifically relates to a method for combined treatment of heavy metal contaminated soil by biological leaching and biological stabilization. Background technique [0002] The remediation techniques of heavy metal contaminated soil mainly include traditional methods and bioremediation methods. The traditional methods mainly include: foreign soil method, chemical cleaning method, chemical reduction method and electric repair method, etc. These methods are expensive and easy to cause secondary pollution. Bioremediation methods mainly include phytoremediation and microbial remediation. Phytoremediation is currently an emerging technology to repair heavy metal contaminated soil, but the plant growth is slow, the biomass is small, the repair time is long, and it is difficult to perform mechanical operations. Most microbial remediation technologies are still limited to the laboratory level. T...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/02
CPCB09C1/02B09C1/10
Inventor 杨添奇纪智慧成一知
Owner 湖南新九方科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com