Biological treatment is an important and integral part of any
wastewater treatment plant that treats wastewater from either
municipality or industry having soluble organic impurities or
a mix of the two types of wastewater sources. The obvious
economic advantage, both in terms of capital investment and
operating costs, of biological treatment over other treatment
processes like chemical oxidation; thermal oxidation etc. has
cemented its place in any integrated wastewater treatment
plant.