Assessing the transition effects in a drinking water distribution system caused by changing supply water quality: an indirect approach by characterizing suspended solids

WATER RESEARCH

卷:168

Article

Chen, Lihua^1,2  Ling, Fangqiong³  Bakker, Geo⁴  Liu, Wen-Tso⁵  Medema, Gertjan^1,6  van der Meer, Walter^7,8  Liu, Gang^1,2 

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China

[2] Delft Univ Technol, Fac Civil Engn & Geosci, Dept Water Management, Sanit Engn, POB 5048, NL-2600 GA Delft, Netherlands

[3] Washington Univ, Sch Engn & Appl Sci, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA

[4] Vitens NV, POB 1205, NL-8001 BE Zwolle, Netherlands

[5] Univ Illinois, Dept Civil & Environm Engn, 205 N Mathews Ave, Urbana, IL 61801 USA

[6] KWR Watercycle Res Inst, POB 1072, NL-3430 BB Nieuwegein, Netherlands

[7] Oasen Water Co, POB 122, NL-2800 AC Gouda, Netherlands

[8] Univ Twente, Sci & Technol, POB 217, NL-7500 AE Enschede, Netherlands

关键词: Upgrading treatments;    Drinking water distribution system;    Transition effects;    Suspended solids;    Water quality deterioration risks;   

DOI  :  10.1016/j.watres.2019.115159

来源: Elsevier

【 摘 要 】

Worldwide, it is common that the drinking water distribution systems (DWDSs) may be subjected to changes of supply water quality due to the needs of upgrading the treatment processes or switching the source water. However, the potential impacts of quality changed supply water on the stabilized ecological niches within DWDSs and the associated water quality deterioration risks were poorly documented. In the present study, such transition effects caused by changing the supply water quality that resulted from destabilization of biofilm and loose deposits in DWDS were investigated by analyzing the physiochemical and microbiological characteristics of suspended particles before (T-0), during (T3-weeks) and after upgrading the treatments (T6-months) in an unchlorinated DWDS in the Netherlands. Our results demonstrated that after 6 months' time the upgraded treatments significantly improved the water quality. Remarkably, water quality deterioration was observed at the initial stage when the quality-improved treated water distributed into the network at T3-weeks. observed as a spike of total suspended solids (TSS, 50-260%), active biomass (ATP, 95-230%) and inorganic elements (e.g. Mn, 130-250%). Furthermore, pyrosequencing results revealed sharp differences in microbial community composition and structure for the bacteria associated with suspended particles between To and T3-weeks, which re-stabilized after 6-months at To-months. The successful capture of transition effects was especially confirmed by the domination of Nitrospira spp. and Polaromonas spp. in the distribution system at T3-weeks, which were detected at rather low relative abundance at treatment plant. Though the transitional effects were captured, this study shows that the introduction of softening and additional filtration did not have an effect on the water quality for the consumer which improved considerably after 6-months' period. The methodology of monitoring suspended particles with MuPFiSs and additional analysis is capable of detecting transitional effects by monitoring the dynamics of suspended particles and its physiochemical and microbiological composition. (C) 2019 The Authors. Published by Elsevier Ltd.

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