Stabilizing agents and stabilization methods for polluted soil in electroplating sites

A technology that pollutes soil and soil, applied in the field of soil treatment, can solve the problems of high treatment cost and destruction of natural components

Active Publication Date: 2021-04-13
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching technology mainly uses chemical agents to promote the dissolution of heavy metals in the soil, but these agents will also cause certain damage to some natural components in the soil (such as organic matter, nutrients), etc. At the same time, the dissolved heavy metal-containing waste liquid also needs to be reprocessed. Further treatment, especially the heavy metal sludge produced by treatment is often hazardous waste, and the treatment cost of this part of solid waste is relatively high

Method used

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  • Stabilizing agents and stabilization methods for polluted soil in electroplating sites
  • Stabilizing agents and stabilization methods for polluted soil in electroplating sites

Examples

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Effect test

Embodiment

[0038] Example: An electroplating factory pollutes the soil

[0039]After an electroplating plant stopped production, it was found that its soil was polluted by heavy metals copper, zinc, nickel, lead, and hexavalent chromium. The results of the distilled water experiment show that the soil will release high concentrations of copper and zinc pollutants, and the released concentrations far exceed the limit value of category V groundwater in my country's current "Groundwater Environmental Quality Standards" (GB / T-14848-2017). In the case of any treatment, the heavy metals in the soil will pollute the surrounding area (see Table 1 for details). The stabilizing agent designed according to Table 2 was put into the polluted soil, and the experimental group 6# was the agent and the way of delivery of this application.

[0040] Table 1 Basic situation of contaminated soil in electroplating plants

[0041] Pollutants Content in soil (mg / kg) Distilled water leaching conce...

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Abstract

The present application discloses a method for stabilizing polluted soil in an electroplating site, which includes: firstly adding roasted modified crab shell ash to the soil to be treated, and starting the first curing after mixing with the soil; Add two-step pyrolysis-modified crab powder biochar, and mix it with the soil for second curing; the preparation method of the two-step pyrolysis-modified crab powder biochar is as follows: crush crab shells to a particle size of 1mm and below, then put the crab shell powder in a closed container for the first step of pyrolysis treatment; the first step of pyrolysis process is to start from room temperature and heat at a heating rate of 4°C to 6°C / min until the pyrolysis temperature reaches 260 ℃, maintain at 260℃ for 20min~30min; after the first step of pyrolysis, proceed to the second step of pyrolysis, during the second step of pyrolysis, the temperature is raised to 400℃ at 4℃~6℃ / min, and maintained at 400℃ for 20min ~30min.

Description

technical field [0001] The present application relates to the technical field of soil treatment, in particular to a stabilization agent for polluted soil in an electroplating site and its preparation and application. Background technique [0002] Heavy metal pollutants are more likely to stay in the soil environment due to their potential, concealment, low mobility, persistence and non-biodegradability. Through the bioaccumulation and biomagnification of the food chain, it will eventually endanger human health. Heavy metal stabilization technology is to convert heavy metals into forms with low solubility, poor migration ability or low toxicity by adding chemical agents or using other means, reducing their bioavailability and reducing possible health risks. [0003] Stabilization technology can treat a variety of heavy metals at the same time. Typical heavy metal pollution stabilization agents include alkaline substances such as fly ash, slag, lime, asphalt, fly ash, and Por...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C09K17/06C09K17/02B09C1/08B09C1/00
CPCB09C1/00B09C1/08C09K17/02C09K17/06
Inventor冯一舰钟重张弛凌晓婷吴超李斐
OwnerENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE