DOI: 10.1016/j.watres.2018.10.085
Scopus记录号: 2-s2.0-85056175903
论文题名: Using upstream oxidants to minimize surface biofouling and improve hydraulic performance in GAC biofilters
作者: de Vera G.A. ; Lauderdale C. ; Alito C.L. ; Hooper J. ; Wert E.C.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 526
结束页码: 534
语种: 英语
英文关键词: Biofiltration
; Biological Filtration
; Filter clogging
; Granular Activated Carbon (GAC)
; Head loss
; Oxidants
Scopus关键词: Activated carbon
; Adenosinetriphosphate
; Air pollution control
; Biofilters
; Biofiltration
; Biomass
; Chlorine compounds
; Granular materials
; Organic carbon
; Potable water
; Surface reactions
; Assimilable organic carbon
; Biological filtration
; Filter clogging
; Granular activated carbons
; Head loss
; Hydraulic performance
; Residual concentrations
; Surface mediated reaction
; Oxidants
; activated carbon
; adenosine triphosphate
; chlorine
; drinking water
; hydrogen peroxide
; monochloramine
; organic carbon
; oxidizing agent
; activated carbon
; biodegradation
; biofilm
; biofiltration
; biofouling
; biomass
; chemical compound
; chemical reaction
; filter
; growth
; oxidant
; performance assessment
; Article
; biodegradation
; biofouling
; biomass production
; comparative study
; controlled study
; dechlorination
; limit of detection
; measurement
; oxidation
; priority journal
; surface property
; total organic carbon
; turbidity
; water treatment
英文摘要: The combination of biological growth and particle loading can adversely affect hydraulic performance in drinking water biofilters. In this study, upstream oxidant addition was used to distribute biologically-derived filter clogging in granular activated carbon (GAC) biofilters. Oxidant penetration was assessed during pilot-scale operation and backwashing of dual media (GAC/sand) and multimedia (GAC/anthracite/sand) biofilters. Influent chlorine (HOCl), monochloramine (NH2Cl), and hydrogen peroxide (H2O2) residuals were optimized to react with the GAC surface in the upper portion of the filter media bed (depth < 0.5 m) to attenuate biomass development. As the oxidant residual was quenched by surface-mediated reaction with the filter media, biomass growth was promoted deeper in the filter bed (depth > 0.5 m). The oxidant-induced effects on biomass and hydraulic performance were monitored through measurements of adenosine triphosphate (ATP) and head loss accumulation at different media depths. Addition of oxidants (e.g., 0.6 mg Cl2/L HOCl) could decrease terminal head loss by 20% in dual media filters and 40% in multimedia filters. These hydraulic benefits were achieved without significantly affecting removal of assimilable organic carbon (AOC), total organic carbon (TOC), turbidity, and particle counts. Oxidant type, residual concentration, media type, media age, and media depth influenced the passage of oxidant residuals and distribution of filter biomass. When oxidants were added during backwashing, oxidant residual was quenched through the bed depth from a combination of reactions with GAC media and biofilm degradation. This attenuation of residual oxidant may prevent the oxidant residual from penetrating the entire bed depth, potentially compromising backwashing objectives. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122183
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; HDR Engineering Inc., 5426 Bay Center Drive, Suite 400, Tampa, FL 33609-3444, United States; HDR Engineering Inc., 2650 Park Tower Drive, Suite 400, Vienna, VA 22180, United States; CDM Smith, 14432 SE Eastgate Way 100, Bellevue, WA 98007, United States
Recommended Citation:
de Vera G.A.,Lauderdale C.,Alito C.L.,et al. Using upstream oxidants to minimize surface biofouling and improve hydraulic performance in GAC biofilters[J]. Water Research,2019-01-01