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Chemical fixation-biomass improvement coupled repairing method of cadmium zinc combined polluted acidic soil

A technology for compound pollution and acid soil, applied in the restoration of polluted soil and other directions, can solve the problem of lack of research on the treatment of cadmium and zinc compound pollution, and achieve the effects of rapid restoration efficiency, large processing capacity and high restoration efficiency.

Active Publication Date: 2014-04-09
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many studies on the treatment of cadmium or zinc single polluted soil, but there is a lack of research on the treatment of combined pollution of cadmium and zinc.

Method used

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  • Chemical fixation-biomass improvement coupled repairing method of cadmium zinc combined polluted acidic soil
  • Chemical fixation-biomass improvement coupled repairing method of cadmium zinc combined polluted acidic soil
  • Chemical fixation-biomass improvement coupled repairing method of cadmium zinc combined polluted acidic soil

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Simulated cadmium-zinc compound polluted soil remediation test

[0035] The soil near Changsha Xianghe Chemical Plant in Zhentou Town, Liuyang City, Hunan Province was collected and passed through a 2mm sieve. Weigh 2000g of sieved soil, add 0.23g of 3CdSO 4 .8H 2 O and 43.98 g of ZnSO 4 .7H 2 O, mix evenly, spray deionized water according to the moisture content of 60% of the field water holding capacity of the soil, mix evenly and air-dry, and pass through a 2mm sieve again. Weigh 100g of the above soil into a 250mL plastic bottle, add 0.801g CaCO 3 Mix with the test soil. Take 23.5g / L of Na 2 S·9H 2 Spray 20.5mL of O solution into the mixed soil, so that the soil water content is maintained at about 60-75wt% of the field water holding capacity of the soil, vibrate horizontally on an oscillator with a speed of 180 rpm for 2h, let it stand, and measure it after 1d. Water-soluble and available Cd and Zn contents in soil. Then add 2g of dry pig manure...

Embodiment 2

[0036] Example 2: Liuyang cadmium-zinc compound polluted soil remediation test

[0037] The collected soil in Changsha Xianghe Chemical Plant, Zhentou Town, Liuyang City, Hunan Province was air-dried, ground, and passed through a 2mm aperture sieve. Weigh 100g of the above soil into a 250mL plastic bottle, add 0.801g CaCO 3 Mix with the test soil. Take 23.5g / L of Na 2 S·9H 2 Spray 20.5mL of O solution into the mixed soil, so that the soil water content is maintained at about 60-75wt% of the field water holding capacity of the soil, vibrate horizontally on an oscillator with a speed of 180 rpm for 2h, let it stand, and measure it after 1d. Water-soluble and available Cd and Zn contents in soil. Then add 2g of dry pig manure, mix well, place it for 2 months, and measure the content of soil organic matter, available nitrogen and phosphorus. After testing, the removal rate of soil water-soluble Cd is 100%, the removal rate of water-soluble Zn is 95.6%; the removal rate of soi...

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Abstract

The invention discloses a chemical fixation-biomass improvement coupled repairing method of cadmium zinc combined polluted acidic soil, comprising the following steps of: crushing the cadmium zinc combined pollutant acidic soil and sieving through a sieve with the aperture being 2mm, adding a CaCO3 powder, uniformly mixing the CaCO3 powder with the polluted soil, spraying a Na2S solution until the water content in the soil reaches 60-75 wt% of field moisture capacity, horizontally shaking for 2h, standing for 1 day until heavy metal cadmium and zinc in the soil are fixed and repaired, adding 2-5 wt% of pig manure into the soil, uniformly mixing, and standing for 1-2 months. By the adoption of the method to repair the cadmium zinc polluted acidic soil, the clearance of waste-soluble Cd in the soil reaches 100%, the clearance of available Cd reaches more than 88%, and the clearance of water-soluble Zn reaches more than 95%. Soil organic matter and available nutrients all reach medium fertility level and are beneficial to vegetation recovery. In the meantime, the invention has advantages of simple technology, low cost, fast effectiveness and long-term stability of heavy metal.

Description

technical field [0001] The invention relates to the field of remediation of soil polluted by heavy metals, in particular to an acidic soil chemical-biomass improvement compound treatment method for compound pollution of cadmium and zinc. Background technique [0002] Cadmium has been widely used in mining, smelting, electroplating, automobiles and aviation, pigments, paints, printing, plastic stabilizers, pesticides and fertilizers and other industries. At the same time, environmental pollution caused by cadmium also appeared, and sewage irrigation also caused a large area of ​​cultivated land to be polluted by cadmium. Especially since the discovery of "Itai-Itai Disease" in the Jinzugawa River Basin, Toyama Prefecture, Japan in the 1960s, which confirmed that cadmium in the soil can pass through the food chain into the human body and cause harm to human health, the problem of cadmium pollution and toxicity has aroused worldwide attention. of high attention. According to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 杨志辉柴立元王庆伟闵小波李倩张淑娟吴宝麟
Owner CENT SOUTH UNIV
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