Chemical stabilization of medical waste fly ash using chelating agent and phosphates: Heavy metals and ecotoxicity evaluation.
Chemical stabilization of medical waste fly ash using chelating agent and phosphates: Heavy metals and ecotoxicity evaluation.
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DOI：
10.1016/j.wasman.2009.03.005
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发表时间：
2009-07
期刊：
影响因子：
8.1
通讯作者：
Sukandar;Tri Padmi;Masaru Tanaka;I. Aoyama
中科院分区：
文献类型：
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作者：
Sukandar;Tri Padmi;Masaru Tanaka;I. Aoyama
采用螯合剂（Ashnite S803）、酸性磷酸溶液（Ashnite R303）和碱性磷酸溶液（Ashnite R201）对医疗废物飞灰中的重金属进行了化学稳定化处理。为了预测重金属的可吸收性，将日本浸出试验（JLT-13）程序应用于稳定化粉煤灰制品。采用莴苣根伸长抑制、大型蚤死亡率和费氏弧菌光抑制等生物测定方法，对稳定化粉煤灰制品渗滤液和未稳定化粉煤灰制品渗滤液进行生态毒性评价。结果表明，3种稳定剂均能显著降低渗滤液中重金属的浓度（ANOVA，P<0.05）。虽然稳定化和未稳定化的粉煤灰的浸出液对莴苣和水蚤都具有很强的毒性，但这些稳定剂的掺入显著降低了浸出液对三种测试生物的毒性（ANOVA，P<0.05）。采用Pearson相关分析法分析了渗滤液中化学元素浓度与生物测定结果之间的相关性。渗滤液中大部分重金属含量与生物测定值呈显著正相关（ANOVA，P<0.05）。然而，溶解性有机碳（DOC）的浓度与渗滤液对受试生物的毒性效应之间没有相关性。
Chemical stabilization of heavy metals in medical waste fly ash has been carried out using the following compounds: a chelating agent (Ashnite S803), a commercial acidic phosphoric acid solution (Ashnite R303) as well as basic one (Ashnite R201). In order to predict the leachability of heavy metals, Japanese Leaching Test (JLT-13) procedure was applied to the stabilized fly ash products. An ecotoxicity assessment of the stabilized fly ash products leachate and the unstabilized fly ash leachate was conducted using a battery of bioassays based on lettuce root elongation inhibition, Daphnia magna mortality and Vibrio fischeri photoinhibition. The results showed that the three stabilizing agents were able to significantly decrease (ANOVA, P<0.05) the concentration of heavy metals in the leachates. Although the leachate from both stabilized and unstabilized fly ash were very toxic to lettuce and daphnids, the incorporation of these stabilizing agents diminished significantly (ANOVA, P<0.05) the toxicity of the leachates towards the three tested organisms. Pearson correlation analysis was used to analyze the strength of the relationship between chemical elements concentration in the leachate and bioassays results. Most of the heavy metals in the leachate were significantly correlated (ANOVA, P<0.05) with the toxicity values of the bioassays. However, the correlation was not found between the concentration of dissolved organic carbon (DOC) and the toxicity effect of the leachate to the tested organisms.