OPTIMIZATION OF CHELATION CONDITIONS FOR FLY ASH BY CHELATING AGENTS AND STABILITY EVALUATION

SONG Qian-nan; WANG Feng; TANG Yi; TONG Li-zhi; HU Bin; YANG Xiao-jin; HU Qing

doi:10.13205/j.hjgc.202010030

Volume 38 Issue 10

Nov. 2020

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SONG Qian-nan, WANG Feng, TANG Yi, TONG Li-zhi, HU Bin, YANG Xiao-jin, HU Qing. OPTIMIZATION OF CHELATION CONDITIONS FOR FLY ASH BY CHELATING AGENTS AND STABILITY EVALUATION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 190-195,215. doi: 10.13205/j.hjgc.202010030

Citation:

SONG Qian-nan, WANG Feng, TANG Yi, TONG Li-zhi, HU Bin, YANG Xiao-jin, HU Qing. OPTIMIZATION OF CHELATION CONDITIONS FOR FLY ASH BY CHELATING AGENTS AND STABILITY EVALUATION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 190-195,215. doi: 10.13205/j.hjgc.202010030

Citation:

SONG Qian-nan, WANG Feng, TANG Yi, TONG Li-zhi, HU Bin, YANG Xiao-jin, HU Qing. OPTIMIZATION OF CHELATION CONDITIONS FOR FLY ASH BY CHELATING AGENTS AND STABILITY EVALUATION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 190-195,215. doi: 10.13205/j.hjgc.202010030

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OPTIMIZATION OF CHELATION CONDITIONS FOR FLY ASH BY CHELATING AGENTS AND STABILITY EVALUATION

doi: 10.13205/j.hjgc.202010030

1. School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. School of Environmental Science & Engineering, South University of Science and Technology of China, Shenzhen 510085, China;
3. Engineering Innovation Center(Beijing), South University of Science and Technology of China, Beijing 100083, China;
4. School of Environment, Harbin Institute of Technology, Harbin 150090, China

Received Date: 2019-09-09

Abstract

Abstract

In this paper, the effects of the amount of chelating agent, the addition of water and the mixing time on the leaching concentration of various heavy metals from waste incineration fly ash during the stabilization process were studied. And the leaching behaviors of heavy metals in different conditions including natural environment, with ultraviolet light and at 35 ℃ was investigated, to compare the chelation properties of macro molecular DTC and small molecule SDD. The results showed that when the dosage of chelating agent reached 3%, the leaching concentration of six heavy metals commonly found in fly ash was lower than the specified limit given in GB 16889—2008; for Pb, Zn and Cd, increasing the water content during chelation could reduce the concentration of heavy metals in the leachate; when the mixing time exceeded two minutes, the leaching of heavy metals from the fly ash was basically stable. The leaching concentration of heavy metals in the chelated fly ash under different conditions all met the landfill admission control standard, and it was found that DTC had better chelation effect, compared with SDD.
- incineration fly ash,
- heavy metals,
- chemical stabilization,
- heavy metal chelating agent

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