Department of Chemistry, Aristotle University of Thessaloniki, GR 54124, Greece.
Department of Chemistry, Aristotle University of Thessaloniki, GR 54124, Greece.
J Environ Manage. 2018 Jun 15;216:257-262. doi: 10.1016/j.jenvman.2017.03.077. Epub 2017 Mar 31.
In this study, the stabilization of tannery sludge, which produced during the physico-chemical treatment of tannery wastewaters, was examined by the addition of ladle furnace slag. Moreover, the simultaneous addition of organoclay and ladle furnace slag for the stabilization of tannery sludge was also examined. Chromium and dissolved organic carbon in the leachate of raw tannery sludge, using the EN 12457-2 standard leaching test, were found to exceed the limit values for disposal in non-hazardous and even in hazardous waste landfills, according to the EU Decision 2003/33/EC. Tannery waste (air-dried sludge) was mixed with ladle furnace slag and water or ladle furnace slag, organoclay and water at different ratios, in order to study the stabilization of chromium and organic compounds. The mixtures were left for one week aging and then they were subjected to the standard leaching test EN 12457-2. The leachate of tannery waste stabilized with ladle furnace slag showed Cr concentrations below the respective regulation limit value for disposal in non-hazardous waste landfills; however, the dissolved organic carbon cannot meet the respective limit value. On the other hand, the leachate of tannery waste stabilized with a mixture of ladle furnace slag and organoclay, using 30:50:20 mass ratio, presented both Cr and dissolved organic carbon concentrations below the regulation limit values for disposal in non-hazardous waste landfills. Moreover, this leachate was further subjected to ecotoxicity test, using the Vibrio fischeri photo-bacterium. The leachate of stabilized tannery waste showed reduced ecotoxicity, in comparison with the toxicity effect of the leachate of the untreated tannery waste.
本研究通过添加钢包炉渣来稳定制革污泥，该污泥是在制革废水的物理化学处理过程中产生的。此外，还研究了同时添加有机粘土和钢包炉渣来稳定制革污泥。采用欧盟 2003/33/EC 号决议中规定的 EN 12457-2 标准浸出试验，发现原制革污泥浸出液中的铬和溶解有机碳超过了在非危险废物甚至危险废物填埋场处置的限值。制革废物（风干污泥）与钢包炉渣和水或钢包炉渣、有机粘土和水按不同比例混合，以研究铬和有机化合物的稳定化。将混合物放置一周老化，然后进行标准浸出试验 EN 12457-2。用钢包炉渣稳定化的制革废物浸出液中 Cr 浓度低于在非危险废物填埋场处置的相应规定限值；然而，溶解有机碳不能满足相应的限值。另一方面，用 30:50:20 的质量比混合钢包炉渣和有机粘土稳定化的制革废物浸出液，Cr 和溶解有机碳浓度均低于在非危险废物填埋场处置的规定限值。此外，该浸出液还进一步进行了利用发光菌的生态毒性试验。与未经处理的制革废物浸出液的毒性效应相比，稳定化制革废物的浸出液显示出较低的生态毒性。
