Stabilization/solidification of lead in MSWI fly ash with mercapto functionalized dendrimer Chelator
Stabilization/solidification of lead in MSWI fly ash with mercapto functionalized dendrimer Chelator
复制标题
使用巯基官能化树枝状大分子螯合剂稳定/固化垃圾焚烧飞灰中的铅
DOI：
10.1016/j.wasman.2016.02.001
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发表时间：
2016
期刊：
影响因子：
8.1
通讯作者：
Wu Yinan
中科院分区：
文献类型：
--
作者：
Zhang Bingru;Zhou Weixiao;Zhao Huangpu;Tian Zhipeng;Li Fengting;Wu Yinan
本文比较了硫化钠（Na 2S）、磷酸钠（Na 3 PO 4）、硫脲等稳定铅的性能（H2 NCSNH 2）和巯基官能化树枝状聚合物研究了垃圾焚烧飞灰中四乙烯四胺钠（TEPA-SNa）的浸出毒性和浸出行为，结果表明，Na 2S，Na 3 PO 4，H_2NCSNH_2在投加量为10%时仍高于限值（0.25 mg/L）。然而，与TEPA-SNa相关的浸出值在3%的剂量下接近于零。有效浸出试验结果表明，TEPA-SNa稳定剂在3%用量下，Pb的浸出量比最大允许浸出量（5 mg/kg）低3.58mg/kg，而Na 2S、Na 3 PO 4、H2 NCSNH 2稳定剂对Pb的浸出量远高于5 mg/kg。pH值对铅浸出行为的影响表明，TEPA-SNa稳定剂在5%的用量下，无论pH值如何变化，铅的浸出浓度都接近于零。综上所述，TEPA-SNa在酸碱环境中能与Pb 2+发生相互作用，长期有效地吸附粉煤灰中的Pb 2+。
This work compares the performance of stabilizing Pb by Sodium sulfide (Na2S), Sodium phosphate (Na3PO4),thiourea (H2NCSNH2), and mercapto functionalized dendrimer (TEPA-SNa) in MSWI fly ash, including leaching toxicity analysis and leaching behavior analysis, as a function of pH. The leaching toxicity in fly ash indicated that leaching value of Pb stabilized by Na2S, Na3PO4, and H2NCSNH2has remained higher than the limit value (0.25 mg/L) with a dosage of 10%. However, the leaching value associated with TEPA-SNa approaches zero at a dosage of 3%. The effective leaching test results showed the leaching amount of Pb stabilized by TEPA-SNa with a dosage of 3% to be 3.58 mg/kg less than the maximum allowable amount of leaching (5 mg/kg), but the amount of Pb leached by Na2S, Na3PO4, and H2NCSNH2was much higher than 5 mg/kg. The leaching behavior of Pb as a function of pH showed that the leaching concentration of Pb stabilized by TEPA-SNa can approach zero at a dosage of 5% no matter how the pH changes. In summary, TEPA-SNa can interact with Pb2+in the acid–base environment and effectively immobilize Pb2+in fly ash in the long term.