Influence of toxic metals on the repression of carbonaceous oxygen demand

Toxic metals like lead, bismuth, mercury and zinc-aranyl have been found to repress the carbonaceous oxygen demand. The biological seed was developed from trade waste of Glaxo Laboratories. Three concentrations: 5, 10 and 15 mg 1 −1 of the metals were used to observe repression of carbonaceous oxygen demand of amino acid, methionine, used as substrate. Rate constants, ratios of ( t / y ) 1.3 and COD: BOD were computed.