Solving overflow pollution of sewage plant in Flood season -- a sewage treatment plant in Longmatan District, Luzhou, Sichuan Province

  Application background:  

The designed treatment scale of this sewage treatment plant is 50,000m ³/d, and the water volume reaches 70,000m ³/d in rainy season, resulting in overflow pollution.

  Solution:  

The original wastewater treatment process remained unchanged, and an appropriate amount of NFSSS nano-flocculant was added to the inlet end of secondary sedimentation tank after the increase of water volume in rainy season to realize the rapid separation of mud and water in secondary sedimentation tank and ensure the clarification of effluent. At the same time, the sludge is intercepted to the biochemical system to ensure the treatment effect of the biochemical system and achieve the standard discharge in the rainy season.

  Effect display:  

Through the above scheme, the maximum water volume in rainy season can reach 77,000 m³/d, increasing the treatment capacity by 1.54 times. The effluent from the secondary sedimentation tank is clarified, and the effluent continues to reach the standard.

             Change of daily treated water quantity before and after dosing in STP                         Water quality before and after dosing in STP