Research on emergency treatment of sewage in expressway service areas using sodium hypochlorite and magnetic coagulation
The sewage volume in the expressway service area fluctuates greatly,and excessive sewage can easily lead to poor treatment efficiency of conventional biochemical treatment processes or in-crease the risk of sewage overflow.Emergency treatment needs to be considered.The experiment used sodium hypochlorite and magnetic coagulation technology to treat emergency sewage in expressway service areas.When the influent COD was 186.37 mg/L,NH3-N was 24.8 mg/L,TP was 3.03 mg/L,TN was 27.1 mg/L,and the dosages of sodium hypochlorite,PAC,and PAM were 215 mg/L,100 mg/L,and 1 mg/L,respectively,the effluent COD,NH3-N,TP,and TN were 97.56 mg/L,1.43 mg/L,0.38mg/L,and 4.27 mg/L,respectively.The effluent NH3-N,TP,and TN met the first level A standard of the Urban Wastewater Treatment Plant Pollutant Discharge Standard(GB 18918-2002);the removal rate of COD by this process is 47.65%,and the effluent COD meets the first level standard in Table 4 of the Comprehensive Wastewater Discharge Standard(GB 8978-1996).To further reduce the effluent COD,activated carbon adsorption can be used.
expressway service sewageemergency treatmentsodium hypochloritemagnetic coagu-lation