globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2019.02.006
Scopus记录号: 2-s2.0-85062045094
论文题名:
Using discrete and online ATP measurements to evaluate regrowth potential following ozonation and (non)biological drinking water treatment
作者: de Vera G.A.; Wert E.C.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 154
起始页码: 377
结束页码: 386
语种: 英语
英文关键词: Adenosine Triphosphate (ATP) ; Biofiltration ; Biomass production potential ; Biostability ; Chlorine ; Regrowth
英文摘要: Water utilities must control microbial regrowth in the distribution system to protect public health. In this study, an adenosine triphosphate (ATP)-based biomass production potential test using indigenous bacterial communities were used to evaluate regrowth potential following ozonation with either biofiltration (BF) or sustained chlorination (SCl 2 ). Two full-scale water treatment plants with different upstream processes (i.e., WTP-BF: ozonation, coagulation/flocculation, biofiltration, UV irradiation, chlorination; and WTP-SCl 2 : ozonation, chlorination, coagulation/flocculation, filtration, chlorination) were compared. Characterization of indigenous bacteria using 16S rRNA gene sequencing, qPCR, and cellular ATP (cATP) showed microbial diversity changes across treatment, biomass sloughing from biofilters (effluent cATP = 30 ± 1 ng/L), and disinfection by chlorine (cATP < 1 ng/L). For both WTPs, 14-day cumulative biomass production (CBP t = ∑t=0tATP(t)×Δt) was highest for ozonated water samples (CBP 14 = 1.2 × 10 3 –3.0 × 10 3 d ngATP/L). CBP further increased with increasing ozone dose due to production of more biodegradable carbon. Growth promotion by carbon was confirmed from the consumption of ozonation byproducts (carboxylic acids, aldehydes) and the increase in CBP (9.5 × 10 2 –2.9 × 10 3 d ngATP/L) after addition of 50–300 μgC/L acetate. Ozone followed by sustained chlorination (WTP-SCl 2 ) effectively controlled biomass growth across the treatment process (CBP 14 <10 d ngATP/L). In contrast, ozone followed by biofiltration (WTP-BF) reduced regrowth potential by 30% (biofilter influent CBP 14 = 1.3 × 10 3 d ngATP/L; biofilter effluent CBP 14 = 9.3 × 10 2 d ngATP/L). After adding chlorine to the biofilter effluent, CBP 14 was reduced to <10 d ngATP/L. Lastly, online ATP measurements confirmed the discrete measurements and improved identification of the cATP peak and growth phases of indigenous bacteria. © 2019 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121926
Appears in Collections:气候变化事实与影响

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作者单位: Applied Research and Development Center, Southern Nevada Water Authority, P.O. Box 99954, Las Vegas, NV 89193, United States

Recommended Citation:
de Vera G.A.,Wert E.C.. Using discrete and online ATP measurements to evaluate regrowth potential following ozonation and (non)biological drinking water treatment[J]. Water Research,2019-01-01,154
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