title: An evaluation of microbial and chemical contamination sources related to the deterioration of tap water quality in the household water supply system.
abstract: The predominant microorganisms in samples taken from shower heads in residences in the Korean city "N" were Stenotrophomonas maltophilia, Sphingomonas paucimobilis, Acidovorax temperans, and Microbacterium lacticum. Legionella was not detected in this case. The volatile organic compounds (VOCs) vinylacetate, NN-DMA, cis-1,2-dichloroethylene, epichlorohydrin, and styrene were measured in five types of plastic pipes: PVC, PB, PP, PE, and cPVC. The rate of multiplication of the heterotrophic plate count (HPC) attached on the copper pipe in contact with hot tap water was higher than the rate for the copper pipe in contact with cold tap water. Biofilm accumulation on stainless steel pipes with added acetate (3 mg/L) was 2.56 times higher than the non-supplemented condition. Therefore, the growth of HPC in the pipe system was affected by the type and availability of nutrients and depended on variables such as heating during the hot water supply.
authors.affiliation: Department of General Education, Konyang University, 121 Daehakro, Nonsan, Chungnam 320-711, Korea. leeyj@konyang.ac.kr
authors.forename: Yoonjin
authors.initials: Y
authors.lastname: Lee
mesh_terms: D001419:Bacteria / Q000254:growth & development / Q000302:isolation & purification; D058491:Bacterial Load; D018441:Biofilms; D002713:Chlorine / Q000032:analysis; D004202:Disinfectants / Q000032:analysis; D004784:Environmental Monitoring; D006798:Housing; D019216:Metals, Heavy / Q000032:analysis; D010969:Plastics; D056910:Republic of Korea; D013193:Stainless Steel; D013696:Temperature; D055549:Volatile Organic Compounds / Q000032:analysis*; D014871:Water Microbiology; D014873:Water Pollutants / Q000032:analysis*; D060753:Water Quality; D014881:Water Supply / Q000032:analysis*
chemical_list: D004202:Disinfectants; D019216:Metals, Heavy; D010969:Plastics; D055549:Volatile Organic Compounds; D014873:Water Pollutants; D013193:Stainless Steel; D002713:Chlorine
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