Analysis and Evaluation of Wastewater Quality During Tunnel Construction Based on Drilling and Blasting Method

During the construction of tunnel based on drilling and blasting method, a large amount wastewater will be produced, in which types concentrations main pollutants change regularly with continuous circulation process. In this paper, Hengwu drilling, post blasting, slag discharge initial support stages is sampled detected, pollutant laws each stage are analyzed, set pair analysis method used to evaluate quality determine degree pollution different stages. The research shows that after concentration ammonia nitrogen first reaches peak, then other begin rise. Different have effects quality. generated most polluted, least polluted. results paper can provide reference for selection treatment process similar projects.