Hexavalent chromium salts occur as pollutants in industrial effluents from leather, aluminum anodizing, and metal plating. Chemical plant effluents contain these from extensive use of chromium salts as corrosion inhibitors in cooling systems.

In industrial effluents, chromium wastes are treated by reduction and precipitation, removing the pollutant, or by ion exchange in which chromate salt is recovered and the deionized water is reused. The latter treatment recovers the pollutant chromium for economical reuse.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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