title: Experimental study on the disinfection efficiencies of a continuous-flow ultrasound/ultraviolet baffled reactor.
abstract: A self-designed continuous-flow ultrasound/ultraviolet (US/UV) baffled reactor was tested in this work, and the disinfection efficiency of secondary effluent from a wastewater treatment plant (WWTP) was investigated in terms of the different locations of ultrasonic transducers inside the reactor under similar input power densities and specific energy consumptions. Results demonstrated that the two-stage simultaneous US/UV irradiation in both chambers 2 and 3 at a flow rate of 1200 L/h performed excellent disinfection efficiency. It achieved an average feacal coliforms concentration of 201±78 colony forming unit (CFU)/L in the effluent and an average of (4.24±0.26) log10 reduction. Thereafter, 8 days of continuous operation was performed under such a condition. A total of 31 samples were taken, and all the samples were analyzed in triplicate for feacal coliforms analysis. Experimental results showed that feacal coliforms concentrations remained at about 347±174 CFU/L under the selected optimum disinfection condition, even if the influent concentrations fluctuated from 3.97×10(5) to 3.57×10(6) CFU/L. This finding implied that all effluents of continuous-flow-baffled-reactor with simultaneous US/UV disinfection could meet the requirements of the discharge standard of pollutants for municipal WWTP (GB 18918-2002) Class 1-A (1000 CFU/L) with a specific energy consumption of 0.219 kWh/m(3). Therefore, the US/UV disinfection process has great potential for practical applications.
authors.affiliation: School of Civil and Environmental Engineering, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Zhou
authors.affiliation: School of Civil and Environmental Engineering, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Guo
authors.affiliation: School of Civil and Environmental Engineering, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China. Electronic address: zifulee@aliyun.com.
authors.forename: Zifu
authors.initials: Z
authors.lastname: Li
authors.affiliation: School of Civil and Environmental Engineering, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Junyuan
authors.initials: J
authors.lastname: Zhao
authors.affiliation: School of Civil and Environmental Engineering, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Yupan
authors.initials: Y
authors.lastname: Yun
mesh_terms: D004203:Disinfection / Q000295:instrumentation / Q000379:methods*; D013010:Sonication; D014466:Ultraviolet Rays; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D062065:Wastewater
keywords: Continuous operation; Continuous-flow ultrasound/ultraviolet baffled reactor; Feacal coliforms; Simultaneous ultrasound/ultraviolet disinfection; Wastewater disinfection