A study carried out by H C Agarwal, P K Mittal, K B Menon and M K K Pillai of the department of zoology, University of Delhi, published in August 1985, traced DDT residues in water, bottom sediments
An audit of the earth addresses the growing concern that the costs of environmental degradation are actually becoming a serious threat to sustained welfare
uasb is a combination of physical and biological processes; the main feature of the former process is the separation of solids and gases from the liquid and that of the latter, degradation of
Low space requirement Low sludge production with quick dewatering characteristics Lesser and simpler electromechanical parts used, leading to low operation and maintenance costs