During the construction period of tunnel engineering,various types of wastewater will be generated,if discharged directly,it will cause serious harm to the surrounding ecological environment.Taking a certain tunnel project as an example,combined with the design scale and water quality requirements,this paper analyzes the wastewater treatment process,main structure design,and treatment effects of each treatment unit.The results show that using the treatment process of oil separation sedimentation tank+integrated air flotation filtration+Gaia-biological aerated filter(G-BAF tank),the effluent quality meets the B-level discharge standard of the"Comprehensive Water Pollutant Discharge Standard"(DB 11/307-2013).The treated wastewater can be recycled and partially reused for tunnel construction.
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