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The aim of this study is the reduction of Zinc from the cyanide-free alkaline zinc-plating effluent. Various methods utilized for removing or recovering the heavy metals are adsorption, chemical precipitation, sedimentation filtration, reverse osmosis etc. We are interested in using oxalis plant as a potential chelating/settling agent for the treatment of electroplating effluent collected from a local industrial unit. Oxalis pes-capae has an exceptionally high content of oxalic acid which is known as moderate and week chelating agent. The efficiency of the performance oxalis powder (KITININ) was estimated and the optimum dose was determined using conductivity, volumetric, atomic absorption spectroscopy and pH measurements. The results show the performance of oxalis in treating Zn plating effluent effectively. In effect, a white crystalline precipitate of zinc oxalate is easily extracted (98,52 % elimination of Zn) and a high settling rate is observed. The maximum zinc uptake by Oxalis in batch systems is estimated to 6,44 mg/g.

Preliminary Study of Zinc Removal from Cyanide-free Alkaline Electroplating Effluent by Precipitation using Oxalis Plants