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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Treatment of a wastewater from a galvanizing industry containing chromium(Ⅵ) and zinc(Ⅱ) by liquid surfactant membranes technique
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Treatment of a wastewater from a galvanizing industry containing chromium(Ⅵ) and zinc(Ⅱ) by liquid surfactant membranes technique

机译：液体表面活性剂膜技术处理含铬（Ⅵ）和锌（Ⅱ）的镀锌工业废水

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摘要

Galvanizing industries generate large amounts of effluents rich in toxic and carcinogenic chromium(VI) species. Effective and sustainable treatments are required to comply with environmental regulations. This work focused on the development of innovative treatments for Cr(VI) by its removal from a galvanizing industry wastewater (pH(initial) = 5.9) containing Cr (78 mg.L-1) and Zn (2178 mg.L-1) using the liquid surfactant membranes technique. The membrane phase carrier was Alamine (R) 336 in Escaid (TM) 110. For a synthetic solution (Cr(VI) = 353mg.L-1, pH(internal phase) = 1.5), 99.9% of Cr(VI) was extracted in three stages ([KOH](internal phase) = 0.27 mol.L-1). For the galvanizing wastewater, two selective extractions treatments were proposed: (1) 87% of Cr(VI) and 2% of Zn(II) were extracted in a single stage ([HCl](feed phase) = 0.03 mol.L-1, [KOH](internal phase) = 0.6 mol.L-1); (2) 95.6% of Cr(VI) and practically no zinc were extracted in a single stage ([HCl] (feed phase) = 10(-6)mol.L-1, [HCl] (internal phase) = 5mol.L-1). In another treatment condition ([HCl] (feed phase) = 2mol.L-1 and [KOH] (internal phase) = 1.2 mol.L-1), the simultaneous Cr(VI) and Zn(II) extractions (95% and 70%, respectively) were obtained in a single stage and more than 99% of both metals in three stages. This resulted in a depleted feed phase with 0.01 mg.L-1 of Cr(VI), that allows its discharge, according to the Brazilian legislation (= 0.1 mg/L).
机译：镀锌行业产生大量富含毒性和致癌铬（VI）物种的污水。需要有效和可持续的治疗方法来遵守环境法规。这项工作的重点是通过从含Cr（78mg.L-1）和Zn（2178mg.L-1）的镀锌工业废水（pH（初始）= 5.9）中去除Cr（vi）的创新治疗的创新治疗使用液体表面活性剂膜技术。膜相载体是ESCAID（TM）110中的醛胺（R）336.对于合成溶液（Cr（VI）= 353mg.L-1，pH（内相）= 1.5），99.9％Cr（VI）是在三个阶段（[KOH]（内相）= 0.27mol.L-1）中提取。对于镀锌废水，提出了两种选择性提取处理：（1）在单级（[HCl]（进料阶段）= 0.03mol.L- 1，[KOH]（内相）= 0.6mol.L-1）; （2）95.6％的Cr（VI）和实际上在单级（[HCl]（进料）（进料）= 10（-6）Moll.1，[HCl]（内相）= 5mol中没有提取锌。 L-1）。在另一种处理条件（[HCl]（进料相）= 2mol.L-1和[KOH]（内相）= 1.2mol.L-1）中，同时Cr（VI）和Zn（II）萃取（95％分别在单一阶段获得70％，在三个阶段中获得超过99％的金属。由巴西法规（＆ = 0.1mg / L）表示，这导致耗尽的饲料相，其允许其排放量。

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