Vol. 1, Issue 4 (2016)
Bioremediation potential of Eisenia fetida and microbes for arsenic contaminated soil and water
Author(s): Anjali Verma, Ashok Ghosh, Mamta Kumari, Namita Dhusia, Nandkishor More
Abstract: Air with hazardous, toxic chemicals, contamination of soils, groundwater are the major problems facing the world today. Contaminated lands and water generally result from past industrial activities when awareness of the health and environmental effects connected with the production, use and disposal of hazardous substances. Heavy metals such as Pb, Cd and As are considered potentially environmental pollutants due to their trends to accumulate on vital organs of humans and animals. Arsenic (As) exists in several forms, which vary in toxicity and occurrence of which arsenate and arsenate. It is used in industry as a wood preservative, paints, dyes, metals, soaps, insecticides and semi-conductors etc. The toxicity and redistribution of arsenic in the environment make it evoking public concern. Earthworms can also tolerate high concentrations of heavy metals in the environment. Several technologies are existing for the remediation of As from contaminated soil and water. The study suggests about the behavior of Eisenia fetida and Microbes (strain 23A - unidentified microbes) in arsenic contaminated soil and water. Their bioremediation potential in arsenic rich media was determined with reference to tolerance. Higher tolerance capacity of Eisenia fetida and Microbes were observed. At 800 ppb concentration, earthworm shows resistance capacity against arsenic toxicity and then gradually decreases after from 900 ppb to 1400 ppb. After providing different concentration of arsenic to earthworm and microbes, the arsenic in earthworm decreases gradually as the microbes play an important role as arsenic munching.