Water treatment techniques
Pressure is mounting on Sukinda valley's mining industry and state authorities in the wake of rising hexavalent chromium levels in the region's water sources. But the search for solutions is yet to gather steam. Experts point out that chromium ore reserves are concentrated in developing countries such as South Africa, Zimbabwe and India, where mine operators have never made a concerted effort to invent effective techniques
Options currently available in Sukinda valley to cleanse water:
• All mine operators are treating water by dosing ferrous sulphate in effluent treatment plants. But some experts feel that ferrous sulphate can introduce other pollutants.
• An electrolytic method has been developed to treat contaminated water, which scientists claim to be cost-effective and ecofriendly. However, a pilot project plant stopped working after a few months.
• Biological treatment is the most modern method for treating water. Pollution-free and inexpensive bacterial strains are applied in industrial toxic water. The drawback: lack of expertise in this field hampers implementation.
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