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2. Treatment of wastes from fertilizer plants;Alagarsamy;Indian J. Envir. Hlth,1973
3. Process Design Manual for Nitrogen Control,1975
4. Standard Methods for the Examination of Water and Wastewater;APHA,1980
5. Synergism and antagonism of arsenic, chromium and fluoride on nitrification process;Atiqullah,1980