Recovery and safer disposal of phosphate coating sludge by solidification/stabilization.
Recovery and safer disposal of phosphate coating sludge by solidification/stabilization.
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DOI：
10.1016/j.jenvman.2012.03.029
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发表时间：
2012-08
影响因子：
8.7
通讯作者：
Selnur Ucaroglu;I. Talinli
中科院分区：
文献类型：
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作者：
Selnur Ucaroglu;I. Talinli
研究了含重金属的汽车磷化污泥的固化/稳定化（S/S）特性。根据土耳其和美国环境保护署（EPA）关于危险固体废物的规定，对该废物的危险特性进行了评估。进行固化/稳定化产物的无侧限抗压强度（UCS）和浸出行为测试。使用波特兰水泥（PC）作为粘结剂进行固化研究。发现UCS随着废物含量的增加而降低。研究发现，当砂浆中的废物含量为20%及以下时，可以将废物回收用于建筑应用，但只有当添加更高的废物浓度时，才能实现安全处置的固化。Cu，Cr，Ni，Pb和Zn被发现是显着固定的固化/稳定化过程。镍和锌，这是目前在特别高的浓度（分别为2.281和135.318克/公斤）在PS，具有最高的保留水平（分别为94.87%和98.74%）在PC砂浆。根据BS 6920标准，通过S/S过程确定PS中存在的有机污染物和重金属被固定。因此，危险聚苯乙烯废物对人类健康和环境产生不利影响的可能性已通过S/S程序有效消除。我们的结论是S/S处理的PS是安全的垃圾填埋场处置，而S/S处理的PS成分的回收仍然是可能的。
Solidification/stabilization (S/S) of automotive phosphate coating sludge (PS) containing potentially toxic heavy metals was studied. The hazardous characteristics of this waste were assessed according to both Turkish and U.S. Environmental Protection Agency (EPA) regulations for hazardous solid waste. Unconfined compressive strength (UCS) and leaching behavior tests of the solidified/stabilized product were performed. Solidification studies were conducted using Portland cement (PC) as the binder. UCS was found to decrease with increasing waste content. It was found that recovery of the waste for construction applications was possible when the waste content of the mortar was 20% and below, but solidification for safe disposal was achieved only when higher waste concentrations were added. Cu, Cr, Ni, Pb and Zn were found to be significantly immobilized by the solidification/stabilization process. Ni and Zn, which were present at particularly high concentrations (2.281 and 135.318 g/kg respectively) in the PS, had highest the retention levels (94.87% and 98.74%, respectively) in the PC mortars. The organic contaminants and heavy metals present in PS were determined to be immobilized by the S/S process in accordance with the BS 6920 standard. Thus, the potential for hazardous PS waste to adversely impact human health and the environment was effectively eliminated by the S/S procedure. We conclude that S/S-treated PS is safe for disposal in landfills, while recovery of S/S-treated PS constituents remains possible.