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首页> 外文期刊>Journal of environmental science and health, Part A. Toxic/hazardous substances & environmental engineering >Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process
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Solidified structure and leaching properties of metallurgical wastewater treatment sludge after solidification/stabilization process

机译：固化/稳定化工艺后冶金废水处理污泥的固化组织及浸出性能

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The presented study investigates solidification/stabilization process of hazardous heavy metals/arsenic sludge, generated after the treatment of the wastewater from a primary copper smelter. Fly ash and fly ash with addition of hydrated lime and Portland composite cement were studied as potential binders. The effectiveness of the process was evaluated by unconfined compressive strength (UCS) testing, leaching tests (EN 12457-4 and TCLP) and acid neutralization capacity (ANC) test. It was found that introduction of cement into the systems increased the UCS, led to reduced leaching of Cu, Ni and Zn, but had a negative effect on the ANC. Gradual addition of lime resulted in decreased UCS, significant reduction of metals leaching and high ANC, due to the excess of lime that remained unreacted in pozzolanic reaction. Stabilization of more than 99 of heavy metals and 90 of arsenic has been achieved. All the samples had UCS above required value for safe disposal. In addition to standard leaching tests, solidificates were exposed to atmospheric conditions during one year in order to determine the actual leaching level of metals in real environment. It can be concluded that the EN 12457-4 test is more similar to the real environmental conditions, while the TCLP test highly exaggerates the leaching of metals. The paper also presents results of differential acid neutralization (d-AN) analysis compared with mineralogical study done by scanning electron microscopy and X-ray diffraction analysis. The d-AN coupled with Eh-pH (Pourbaix) diagrams were proven to be a new effective method for analysis of amorphous solidified structure.
机译：本研究调查了一家初级铜冶炼厂废水处理后产生的有害重金属/砷污泥的固化/稳定过程。研究了粉煤灰和粉煤灰添加熟石灰和波特兰复合水泥作为潜在的粘合剂。通过无侧限抗压强度（UCS）测试、浸出测试（EN 12457-4和TCLP）和酸中和能力（ANC）测试评估了该工艺的有效性。结果发现，在系统中引入水泥会增加UCS，导致Cu，Ni和Zn的浸出减少，但对ANC有负面影响。 逐渐添加石灰导致UCS降低，金属浸出显着减少和高ANC，这是由于在火山灰反应中未反应的石灰过量。实现了99%以上重金属和90%砷的稳定。所有样品的UCS均高于安全处置所需的值。除了标准的浸出测试外，还将固化物暴露在大气条件下一年，以确定金属在真实环境中的实际浸出水平。可以得出结论，EN 12457-4测试更类似于真实的环境条件，而TCLP测试则高度夸大了金属的浸出。本文还介绍了差分酸中和（d-AN）分析的结果，并与通过扫描电子显微镜和X射线衍射分析进行的矿物学研究进行了比较。d-AN与Eh-pH（Pourbaix）图相结合，被证明是一种分析非晶态凝固结构的新型有效方法。

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