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The effects of Cr(VI) and Cr(III) species on the activated sludge growth rate have been assessed for a batch growth system, for a range of chromium concentration between 0 and 320mgl −1 . Cr(VI) was found to stimulate microbial growth for concentrations up to about 25mgl −1 , exhibiting maximum growth stimulation at 10mgl −1 , whilst the lethal dose was found to be between...