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

A technology of compound pollution and restoration method, applied in the field of acid soil chemical-biomass improvement compound treatment, can solve the problem of lack of cadmium and zinc compound pollution treatment research and other problems, and achieve the effects of rapid restoration efficiency, easy operation and low restoration cost

Active Publication Date: 2012-06-27
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

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Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Simulated cadmium-zinc compound contaminated 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 and add 0.23g of 3CdSO 4 .8H 2 O and 43.98 g of ZnSO 4 .7H 2 O, mix well, spray deionized water according to the moisture content of 60% of the soil field water holding capacity, mix well and air-dry, and re-pass through a 2mm sieve. Weigh 100g of the above soil in a 250mL plastic bottle, add 0.801g CaCO 3 Mix well with the test soil. Take 23.5g / L of Na 2 S·9H 2 Spray 20.5 mL of O solution into the mixed soil so that the soil moisture content is maintained at about 60-75wt% of the soil field water holding capacity. Vibrate horizontally on a shaker with a speed of 180 rpm for 2 hours, stand still, and measure after 1 day The content of water-soluble and available Cd and Zn in the soil. Then add 2g of dry pig manure to the so...

Embodiment 2

[0036] Example 2: Liuyang Cd-Zn composite contaminated soil remediation test

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

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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 heavy metal contaminated soil, in particular to a compound treatment method of cadmium-zinc compound pollution acid soil chemical-biomass improvement. Background technique [0002] Cadmium has been widely used in mining, smelting, electroplating, automotive and aviation, pigments, paints, printing, plastic stabilizers, pesticides and fertilizers and other industries. At the same time, environmental pollution caused by cadmium has also appeared, and sewage irrigation has also caused a large area of ​​arable land to be polluted by cadmium. In particular, since the discovery of "Tai-Tai disease" in the Jinzugawa River Basin in Toyama Prefecture in Japan in the 1960s, it was confirmed that cadmium in the soil can be passed through the food chain into the human body and cause harm to human health. The problem of cadmium pollution and toxicity has caused the world High attention. According to statistics from ...

Claims

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Application Information

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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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