title: Biofilm bacteria inactivation by citric acid and resuspension evaluations for drinking water production systems.
abstract: The study investigates the inactivation of biofilm bacteria colonized on the surface of polyvinyl chloride (PVC) pipes delivering either groundwater or treated wastewater. It does so using a citric acid (C6H8O7) solution. The results of the study showed that the optimal conditions of the biofilm bacteria inactivation were over 10,000 mg/L citric acid concentration and 60 minutes of contact time at least. Under these conditions, the removal efficiency could reach above 99.999% for heterotrophic plate count (HPC) bacteria and 99.95% for coliform bacteria. The study also showed that the biofilm bacteria were the major sources of planktonic bacteria resuspended into water purified by drinking water production systems (DWPS).
authors.affiliation: Dept. of Civil Engineering, National Chi Nan University, 1, University Rd., PuLi, Nantou 545, Taiwan. yptsai@ncnu.edu.tw
authors.forename: Y P
authors.initials: YP
authors.lastname: Tsai
authors.forename: T Y
authors.initials: TY
authors.lastname: Pai
authors.forename: J Y
authors.initials: JY
authors.lastname: Hsin
authors.forename: T J
authors.initials: TJ
authors.lastname: Wan
mesh_terms: D018441:Biofilms; D019343:Citric Acid / Q000494:pharmacology*; D011143:Polyvinyl Chloride; D011157:Population Dynamics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014871:Water Microbiology; D014881:Water Supply
chemical_list: D019343:Citric Acid; D011143:Polyvinyl Chloride