title: The impact of chlorine disinfection on biochemical oxygen demand levels in chemically enhanced primary treatment effluent.
abstract: The response trends of biochemical oxygen demand (BOD) and organic strength after the chlorination/dechlorination process were explored through a 2-year, 5-month chemically enhanced primary treatment (CEPT) effluent onsite monitoring program and a 2-month laboratory-scale study. The monitoring results showed that better instantaneous mixing at the chlorine injection point reduced the effect of chlorination/dechlorination on the 5-day BOD levels. The laboratory study results demonstrated that chlorination did not change the particle size distribution, dissolved organic carbon, or chemical oxygen demand of the organic content of the effluent. Nevertheless, chlorination/dechlorination strongly affected the BOD measurement when nitrification was inhibited by changing bioactivity/biodegradation rates.
authors.affiliation: Department of Civil and Environmental Engineering, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Ji
authors.initials: J
authors.lastname: Dai
authors.forename: Feng
authors.initials: F
authors.lastname: Jiang
authors.forename: Chii
authors.initials: C
authors.lastname: Shang
authors.forename: Kwok-ming
authors.initials: KM
authors.lastname: Chau
authors.forename: Yuet-kar
authors.initials: YK
authors.lastname: Tse
authors.forename: Chi-fai
authors.initials: CF
authors.lastname: Lee
authors.forename: Guang-Hao
authors.initials: GH
authors.lastname: Chen
authors.forename: Jingyun
authors.initials: J
authors.lastname: Fang
authors.forename: Liming
authors.initials: L
authors.lastname: Zhai
mesh_terms: D057919:Biological Oxygen Demand Analysis; D002244:Carbon / Q000032:analysis; D002713:Chlorine / Q000737:chemistry*; D004202:Disinfectants / Q000737:chemistry*; D004203:Disinfection / Q000379:methods; D009584:Nitrogen / Q000032:analysis; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis
chemical_list: D002244:Carbon; D002713:Chlorine; D004202:Disinfectants; D009584:Nitrogen; D062065:Wastewater; D014873:Water Pollutants