Three-stage packed-bed anaerobic reactor system has been used to study
the removal of sulphate contents of an industrial effluent by way of
their reduction to sulphides. It has been found that maximum sulphate
removal occurs in the lower part of the reactors and thereafter it bec
omes constant. Moreover the sulphide formation has found to be of the
level which does not cause sulphide inhibition of the reactor system.