Abstract: Ao mountain total tailings of Maanshan Steel Nanshan Mining Industry Company is upstream tailing pond of in middle and later period of service, due to short clarification distance of return water, return water always mudflow. A kind of water sewage treatment plant of return water of tailing pond was developed on-site, effectively increased dry beach length and flood regulation height of tailing pond, quality return water had been improved, created conditions to ensure the safety and standard run of tailing pond.

Key words: Upstream tailing pond, Quality of return water, Water sewage treatment plant