摘要
隧道施工废水中,化学需氧量(COD)、氨氮(NH_(4)^(+)-N)、总氮(TN)、总磷(TP)、石油类等指标为非主要污染因子,悬浮物(SS)、pH值为主要污染因子,SS浓度极高且波动范围大,pH值>9(呈碱性或强碱性),由于低温地区气候恶劣区域条件多变,隧道施工废水直接排放势必会造成周边水土环境的影响。结合施工特殊环境,选取2种混凝剂PAC和PAFC,设计单因素实验,研究了混凝剂投加量、助凝剂投加量、沉淀时间等因素对SS去除效果的影响。实验数据及研究结果表明,在悬浮物浓度一定的情况下,PAFC的混凝效果要优于PAC。
Tunnel construction is generally given priority to with drilling and blasting method,TBM method,shield method,in tunnel construction wastewater,such as chemical oxygen demand(COD),ammonia nitrogen(NH_(4)^(+)-N),total nitrogen(TN),total phosphorus(TP),petroleum and other indicators for non-main pollutants,suspended solids(SS),pH as the main pollution factor,SS concentration extremely high fluctuation range is large,and pH>9 is alkaline or strong alkaline.Due to the changeable climate conditions in low temperature areas,the direct discharge of tunnel construction wastewater is bound to affect the surrounding soil and water environment.Combined with the special construction environment,this paper selected two coagulants PAC and PAC,designed single-factor experiments,and studied the influence of coagulant dosage,coagulant dosage,precipitation time and other factors on the removal effect of SS.The experimental results show that when the PAC was 38 mg/L,the amount of coagulant CPAM was 2.4 mg/L,the precipitation time was 17.5 min,most the SS removal rate was 94.66%,when the PAFC was 32 mg/L,the coagulant CPAM was 2.2 mg/L,the precipitation time was 12.5 min,the SS removal rate was 93.15%,the remaining SS concentration was 68 mg/L,the precipitation time was 12.5~20.0 min,the SS concentration was basically unchanged,around 66 mg/L.It could be seen that the coagulation effect of PAFC was better than that of PAC at a certain concentration of suspended matter.
作者
蔺宏铭
LIN Hongming(Xinjiang Water Resources and Hydropower Survey,Design and Research Institute Co.,Ltd.,Urumqi 830000,China)
出处
《广东水利水电》
2025年第4期80-86,共7页
Guangdong Water Resources and Hydropower
关键词
低温高浊
隧道施工废水
悬浮物
混凝
low temperature and high turbidity
tunnel construction wastewater
suspended solids
coagulation
