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

Remediation method for heavy metal pollution of neutral soil

A remediation method and soil technology, applied in the restoration of polluted soil and other directions, can solve the problems of high cost, unsustainable remediation effect, and heavy remediation workload, and achieve the effects of low cost, reduced mobility and bioavailability

Active Publication Date: 2016-10-12
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It strips heavy metal ions from the surface of basic soil particles, enriches them, removes them or immobilizes them. However, on the whole, these methods have problems such as heavy repair work, high cost, and unsustainable repair effects.

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

[0031] Repair includes the following steps:

[0032] 1. Ethyl orthosilicate is dissolved in the nitric acid solution of ethanol and stirred for 30min to obtain repair reagent, wherein the mass ratio of ethyl orthosilicate to ethanol is 1:5, and the mass ratio of ethanol to nitric acid solution is 1: 5. The mass ratio of nitric acid to water is 1:20;

[0033] 2. Evenly mix the restoration reagent with neutral soil (the neutral soil is dispersed in ultrapure water at a solid-to-liquid ratio of 1:1, and the measured pH is 7.0), so that the restoration reagent can fully contact the basic particles of the soil, among which The mass ratio of restoration reagent to soil is 1:40;

[0034] 3. Mix the sodium hydroxide solution with a pH of 8.5 and the soil treated with the remediation reagent evenly, so that the sodium hydroxide solution can fully contact with the remediation reagent and complete the remediation of heavy metal pollution, wherein the mass ratio of the sodium hydroxide s...

Embodiment 2

[0039] 1. Dissolve tetramethoxysilane in the hydrochloric acid solution of ether and stir for 60 minutes to form a repair reagent. The mass ratio of tetramethoxysilane to ether is 1:5, and the mass ratio of ether to hydrochloric acid solution is 1:5. Hydrochloric acid The mass ratio with water is 1:20;

[0040] 2. Evenly mix the restoration reagent with neutral soil (the neutral soil is dispersed in ultrapure water at a solid-to-liquid ratio of 1:1, and the measured pH is 7.0), so that the restoration reagent can fully contact the basic particles of the soil, among which The mass ratio of restoration reagent to soil is 1:40;

[0041] 3. Evenly mix the potassium hydroxide solution with a pH of 8.5 and the soil treated with the remediation reagent, so that the potassium hydroxide solution can fully contact with the remediation reagent and complete the remediation of heavy metal pollution, wherein the mass ratio of potassium hydroxide solution to soil is 1 :50;

[0042] The res...

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 discloses a remediation method for heavy metal pollution of neutral soil. The remediation method comprises the steps of dissolving a siloxane substance of which the structural formula is Si(OR)4 into an acid solution of alcohol or ether as a remediation reagent; mixing the mixture of the siloxane substance and the acid solution of alcohol or ether with neutral soil for reaction; and then, adding an aqueous solution of inorganic strong base or inorganic weak base for further reaction, wherein the R refers to one or more of methyl, ethyl and propyl. The remediation method for heavy metal pollution of neutral soil is low in cost, and simple, convenient and efficient to implement, and restored heavy metals can be stably maintained in soil for a long time.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal pollution in soil, and in particular relates to a method for remediation of neutral soil heavy metal pollution. technical background [0002] On April 17, 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources jointly announced the "National Soil Pollution Survey Bulletin", which aroused widespread concern from all sectors of society on the state of soil pollution in my country. According to the survey bulletin, the total over-standard rate of soil in the country is 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2%, 2.3%, 1.5% and 1.1% respectively. Judging from the distribution of pollution, soil pollution in the south is heavier than that in the north, and the soil heavy metals in the southwestern and central southern regions exceed the standard in a large range. Generally speaking, the national soil env...

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
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 何曦贺长江
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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