Abstract:
This thesis represents an attempt to evaluate the polluting
effect of tannery waste and to develop suitable treatment
method for the inoffensive disposal of this waste.
Characteri3tics of the tannery effluents were determined
from extensive laboratory analysis. The high inorganic, organic
and toxic pollutants present in tannery waste require treatment
before final disposal into natural source of water. It has been
observed that low concentration of chromium present in the
tannery effluent has no effect on biological treatment process.
The suitability of different processes including primary
sedimentation, aeration, chemical coagulation, aeration with
activated sludge and aeration of tannery waste mixed with
domestic sewage, for the treatment of tannery effluent has
been evaluated. In this context the optimum detention period
for primary sedimentation, the most effective range T pH for
alum coagulation of aerateD effluent and the chemical dose
required for the desired degree of treatment have been determined.
ConclusionE are drawn and recommendations are made for
further study.
