Method for remediation of lead pollution on beach soil

A lead-contaminated, soil technology, applied in the field of remediation of heavy metal-contaminated soil, can solve the problems of high energy consumption and cost, and achieve the effect of reducing cost and energy consumption

Active Publication Date: 2012-11-07
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this method uses a centrifuge to separate dissolved heavy metals from the soil, which consumes a lot of energy and costs, and is not suitable for large-scale implementation in tidal flats.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The remediation soil is mudflat soil in the Pearl River Estuary. The average lead content in the 0-20cm topsoil was 77 mg / kg. The purpose of restoration is to reduce the average lead content of surface soil as much as possible. Combined with the tidal flat reclamation project, the tidal flat has been reclamated to isolate the tidal flat soil from seawater. The soil of reclamation beach should be sun-dried and crushed for 10 days after being drained at low tide, and then soaked in seawater intermittently, with a maximum water depth of 5cm. After each soaking, the soaking water has completely leaked and then put into seawater. The soaking treatment time 5 days. Adjust the soaking water depth to 20cm, continue soaking for 20 days, and then drain. After restoration, the average lead content in the 0-20cm topsoil was 64.4 mg / kg, and the removal rate of lead was 16.3%.

Embodiment 2

[0032] The remediation soil is mudflat soil in the Pearl River Estuary. The average lead content in the 0-20cm topsoil was 77 mg / kg. The purpose of restoration is to reduce the average lead content of surface soil as much as possible. Combined with the tidal flat reclamation project, the tidal flat has been reclamated to isolate the tidal flat soil from seawater. The soil of reclamation beach should be sun-dried and crushed for 30 days after being drained at low tide, and then soaked in seawater intermittently, with a maximum water depth of 5cm. After each soaking, the soaking water has completely leaked and then put into seawater. The soaking treatment time 10 days. Adjust the soaking water depth to 20cm, continue soaking for 30 days, and then drain. After restoration, the average lead content in the 0-20cm topsoil was 55.7 mg / kg, and the removal rate of lead was 27.7%.

Embodiment 3

[0034] The remediation soil is mudflat soil in the Pearl River Estuary. The average lead content in the 0-20cm topsoil was 77 mg / kg. The purpose of restoration is to reduce the average lead content of surface soil as much as possible. Combined with the tidal flat reclamation project, the tidal flat has been reclamated to isolate the tidal flat soil from seawater. The soil of reclamation beach should be sun-dried and crushed for 10 days after being drained at low tide, and then soaked in seawater intermittently, with a maximum water depth of 5cm. After each soaking, the soaking water has completely leaked and then put into seawater. The soaking treatment time 5 days. Adjust the soaking water depth to 20cm, continue soaking for 20 days, and then drain. Repeat the above process once. After restoration, the average lead content in the 0-20cm topsoil was 52.7 mg / kg, and the removal rate of lead was 31.5%.

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PUM

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Abstract

The invention discloses a method for remediation of lead pollution on beach soil. The method disclosed by the invention comprises the following steps of: carrying out alternate drying and wetting treatment on the beach soil, regulating and controlling soil oxidation-reduction potential, thus oxidizable and reducible lead in the beach soil is released and is changed into soluble or exchangeable lead; and carrying out complexing, strengthening and analyzing on the released lead by utilizing chloride ion in sea water, soaking and washing the soil, and washing the lead away from soil body at a surface layer, thus the lead pollution on the soil at the surface layer is remediated. The method disclosed by the invention has the advantages that removal rate of pollutant is high, no chemical agent is required to be added and no secondary harm can be caused to the soil and also has the advantage that beach inning and pollution remediation can be carried out at the same time.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a method for remediating lead pollution in tidal flat soil. Background technique [0002] the term [0003] (1) lead [0004] Lead is a non-essential element for humans and plants, and rarely exists in nature in a free state. Lead mainly damages the human nervous system, digestive system, hematopoietic system and kidneys. Lead in the soil can enter the human body through the food chain. [0005] (2) Chemical forms of lead in soil [0006] The chemical form classification of soil heavy metals is usually divided into exchangeable state, carbonate bound state, reducible state (also known as iron manganese oxide bound state), oxidizable state (also known as organic bound state) and residual state. [0007] The remediation of heavy metal pollution in soil mainly includes two approaches: ① Passivation and stabilization. Passivation means red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 李取生李贤刘针玲崔志红
Owner JINAN UNIVERSITY
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