Shuanghuan River;  stabilizing ponds;  Total volume control;  engineering design;  Paper sewage

The necessity and feasibility of using ecological technology to control the pollution of the Shuanghu River were studied, and an ecological treatment project suitable for use in economically underdeveloped areas in China was designed. Experiments show that the removal rate of CODcr can reach 24 when staying for 58 h. 8%, more than 24 h, the increase is not obvious; The removal rate of SS reached 24.50% when staying for 7 h, but the increase was not obvious after 36 h. The design technology of water conservancy engineering and sewage treatment plant is applied to the design of stable pond, so that the water flow in the pond is effectively improved and the purification efficiency is significantly improved. Actual monitoring shows that ecological treatment works do not affect groundwater. Compared with the original proposed sewage treatment plant plan, the project not only meets the current COD reduction target, but also has a small investment and a short construction period.