HR: 15:25h
AN: B12D-08    [PDF]
TI: Studies On The Influence Of Soil Components On Adsorption-Desorption Of Hazardous Organics And Their Insitu Biodegradation
AU: * Khan, Z
EM: zareenkhan123@yahoo.co.in
AF: Y.Anjaneyulu, Head, Center for Environment, Jawaharlal Nehru Technological University, Masabtank, Hyderabad, A.P 500028 India
AB: Currently approximately 155 cubic yards of soil is contaminated with hazardous organics at Patancheru Industrial area (Hyderabad, India). These hazardous organic contaminants are frequently part of hazardous waste disposed on land and the study of waste site interaction is the key to assess the potential for offsite and onsite contamination. In the present study the authors report the results on the adsorption, soil leaching potential and persistence of phenol, p-nitrophenol,2,4-dichlorophenol and 4,chloro-2,nitrophenol which are the common constituents of the hazardous waste generated. The role of soil components like organic matter, clay, iron and aluminium oxides in the adsorption capacity has been studied. Desorption isotherms of soil adsorbed hazardous organics exhibited hysterisis at high initial concentration indicating the degree of irreversibility of adsorption-deesorption process. Leaching potential of the hazardous organics decreases with their increasing hydrophobicity and soil organic matter content while their persistence in terms of half life time (DT50) increases. Insitu biodegradation has been carried out by developing mixed culture systems which can degrade the phenols to complete mineralisation by utilizing them as the sole source of carbon and their corresponding biodegradation kinetic constants were evaluated. Based on the above data generated preparation of hazardous waste dumpsites with suitable soil surface having high holding capacity for organics and their insitu biodegradation by mixing with specific bacterial cultures enriched from different soils can be exploited as a cost effective technology for reclamation of contaminated sites.
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2003 Fall Meeting