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Curbing toxic emissions from remediated substrate

一种基质、毒性金属的技术，应用在抑制修复基质中的毒性排放领域

Active Publication Date: 2019-06-14
ENVIT ENVIRONMENTAL TECH & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] None of these known methods use Fe and Fe-containing compounds to suppress toxic emissions from soil, sediment or other substrates washed with chelating agents

Method used

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  • Curbing toxic emissions from remediated substrate
  • Curbing toxic emissions from remediated substrate
  • Curbing toxic emissions from remediated substrate

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Embodiment Construction

[0017] From Austria (Austria) has 860mg·kg -1 Pb, 330mg·kg -1 Zn and 3mg·kg -1 Acidic (pH = 5.1) industrially contaminated soil (50 kg, dry weight) of Cd was treated with 60 mM EDTA kg in a mixing vessel -1 solution (w:V ratio=1:1). According to the method of the invention, 1% (w / w) of zero-valent Fe (<0.5mm particles) was added to the soil slurry phase. The soil solids phase was then separated from the slurry using a chamber filter press and rinsed in press with 3 volumes of wash rinse solution to remove large amounts of toxic chelates. The rinse solution is washed and recovered as described in the patent application "Soil and sediment remediation" EP 3153246A1.

[0018] The soil washed with EDTA removed 78%, 20% and 83% of Pb, Zn and Cd, respectively. Lower levels of soil Zn extraction are known to those skilled in the art.

[0019] The washed (remediated) soil contained 28% moisture and was stored at room temperature for 8 weeks. Periodically 30 g samples were collec...

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Abstract

The invention relates to curbing toxic emissions from a remediated substrate. Specifically, the invention discloses a process for curbing of emissions of toxic metals and chelating agent from remediated soils, sediments and other substrates contaminated with toxic metals, said process comprising: (a) remediation of contaminated soil, sediment and other substrate with washing solution, said washingsolution comprising EDTA or other chelating agent from the group of aminopolycarboxylic acids and their salts and mixtures thereof, creating a soil slurry phase (b) addition of 0.05 - 5% (w / w, dry weight) of zero-valent Fe or Fe compounds from the group of Fe-oxides and Fe-oxide-hydroxides into the soil slurry phase to create a Fe-amended slurry (c) mixing of Fe-amended slurry; (d) separation ofsolid phase of remediated and Fe-amended soil, sediment and other substrate from the Fe-amended slurry (e) ageing of remediated and Fe-amended soil, sediment and other substrate for 0.5 - 45 days.

Description

[0001] related application [0002] The methods described in this application include those described in patent application WO 2012173576A2 entitled "Washing of contaminated soils" and in patent application EP 3153 246A1 entitled "Soil and sediment remediation" by the same applicant. The entire contents of both applications are incorporated into this application by reference. technical field [0003] The present invention involves the addition of zero-valent Fe (elemental Fe, zero-valent Fe) and Fe compounds to the slurry phase of soil, sediment (sediment, sediment) and other substrates (substrate, substrate, substrate) to prevent toxic metals and chelating agents from soils, sediments, and other contaminated substrates remediated with EDTA and other aminopolycarboxylic acid chelating agents. Background technique [0004] Remediation of soils, sediments and other substrates (hereinafter referred to as "soil") by washing, extraction, leaching and flushing (hereinafter simply...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/02B09C1/08B09C1/00B09C2101/00
Inventor 多芒·莱斯坦
Owner ENVIT ENVIRONMENTAL TECH & ENG
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