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Waste Management & Research, Vol. 19, No. 6, 573-578 (2001)

Study for reclamation of land occupied by solar evaporation pond at UCIL, Bhopal, India

K.V. George

Scientist, National Environmental Engineering Research Institute (NEERI), Nehru Marg, Nagpur, India, 440 020

M.P. Patil

Scientist, National Environmental Engineering Research Institute (NEERI), Nehru Marg, Nagpur, India, 440 020

R. Swaminathan

Environment Management Consultant, UNIDO Expert, 66, Third Street, Anjugam Nagar, Jefferkhanpet, Chennai, India, 600 083

Solar Evaporation Ponds (SEP) were used by Union Carbide India Limited (UCIL), Bhopal for storage of wastewater containing high concentrations of inorganic chemicals especially chlorides. Area occupied by the SEPs had to be recovered due to closure of the plant. A prerequisite to the reclamation of the SEP area is a study of adjoining soil and groundwater, which may be contaminated due to possible leakage in the pond. Surface soil, subsurface soil and groundwater samples were collected and analysed. The electrical conductivity method was employed inside the pond to test for leak in the geo-membrane liner. This was further confirmed by physically checking the liners. Based on the wet period, total rainfall and evaporation rate of the region, drying of remaining wastewater by spreading in dry ponds followed by pond dismantling was scheduled.

Key Words: solar evaporation pond • electrical conductivity • geo-membrane liner • secured landfill • groundwater • soil sampling


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