Chromium is a hazardous metal available in both Trivalent (Cr +3)and Hexavalent (Cr+6) forms. Cr+6 is evidently toxic whereas Cr+3 is relatively less hazardous than Cr+6. Cr+6 and Cr+3are extensively used in many industrial ...

Industries such as mining and industrial minerals, metallurgical, photo processing, textile, leather and chemical produce wastewater containing heavy metals that are hazardous to man and the environment. Photo processing ...