Disposal of sewage could make the sewage reach the water quality requirement of a certain water body or re-used water, and then carry out the decontamination process.

According to the quality requirement for the recycle water a treatment scheme combining the purification of circulating wastewater and the desulfurization process of stack gas treatment is proposed.

Water quality of Lancangjiang River at leave-boundary section was good and basically meet the requirement of water environmental function.