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OPTIMIZATION OF CHELATION CONDITIONS FOR FLY ASH BY CHELATING AGENTS AND STABILITY EVALUATION
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摘要: 研究了垃圾焚烧飞灰螯合稳定化处理过程中螯合剂的加药量、体系的含水率以及搅拌时间对飞灰中各种重金属浸出浓度的影响；随后研究了飞灰螯合产物在自然环境下、紫外线光照下和35℃下重金属的浸出行为，同时对比了大分子DTC和小分子SDD的螯合性能。结果表明：当螯合剂的加药量达到3%时，飞灰中常见的6种重金属的浸出浓度都低于GB 16889—2008《生活垃圾填埋场污染控制标准》的限值；提高含水率有利于螯合反应的进行，对Pb、Zn和Cd，加大螯合时的含水率都可以降低浸出液中的重金属浓度；当搅拌时间超过2 min后，飞灰中重金属的浸出基本稳定。随着时间推移，不同放置条件下螯合飞灰中重金属的浸出浓度均满足填埋场入场控制标准，同时发现大分子DTC较小分子SDD具有更好的螯合效果。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.
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