Abstract

STABILITY ENRICHMENT OF HEAVY METAL CHROMIUM DURING VERMI-FILTERATION OF INDUSTRIAL EFFLUENT

Jayapriya D.* and K. K. Kavitha

ABSTRACT

This paper illustrated the potential effect of earthworms on heavy metal reduction in vermifiltration for liquid-state industrial effluent from four different station Bharath Heavy Electrical in Trichy. However, the analysis of heavy metal chemical speciation indicated earthworms made stabilisation heavy metals. Present investigation using principal component analysis revealed that transformations of heavy metal fractions were mainly due to the changes in effluent physico-chemical properties like pH, Biochemical oxygen demand, and Chemical Oxygen Demand etc., The results indicated that earthworms in vermifilter had a positive role in reducing heavy metal (Chromium (III)) containing Steel Industry effluent. The perusal of the results showed that BOD, COD, Chromium (III) was removed effectively. The maximum reduction of BOD by 87% COD by 86.45% and Chromium Bdl (below detection limit)was found in the effluent after vermifiltration processes with Bacillus sp and bio-vermifiltration treatment.

Keywords: vermifilter, heavy metal, bio-vermifiltration.