Exploration on the Practice of Wastewater Treatment during the Construction of Railway Tunnel Project
In order to realize the effective treatment of wastewater during the construction period of railway tunnel project,the main sources of wastewater from tunnel construction were analyzed as aggregate flushing,vehicle construction flushing wastewater,component processing,concrete mixing station and domestic sewage of construction personnel.Through the analysis of the impact of pollutants on the environment,it is shown that the wastewater has different degree of impact on the ecological environment and landscape during the construction period.According to the different categories of receiving water bodies,the discharge standards implemented are different.The main pollutants in the wastewater of tunnel construction are suspended solids,petroleum,ammonia nitrogen,COD,etc.The effluent quality of nearly 10 tunnels is summarized.Oil isolation measures can be adopted in the pre-settling tank to remove petroleum,large particles can be removed by swirling natural sedimentation,flocculant can be added,and suspended solids and turbidity can be effectively reduced by flocculation reaction and inclined tube precipitation treatment.That is,through pre-sedimentation+reaction+regulated precipitation+filtration,petroleum,SS,ammonia nitrogen and COD can be effectively removed at the same time to achieve wastewater discharge standards.
万方数据
维普
