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Utilization Of Biodegradable Organic Matter By Biofilms In Drinking Water Distribution Systems Microform
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Author :Graham Alan Gagnon Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612306103 Total Pages :394 pages Book Rating :4.3/5 (61 download)
Book Synopsis Utilization of Biodegradable Organic Matter by Biofilms in Drinking Water Distribution Systems [microform] by : Graham Alan Gagnon
Download or read book Utilization of Biodegradable Organic Matter by Biofilms in Drinking Water Distribution Systems [microform] written by Graham Alan Gagnon and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1997 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Utilization of Biodegradable Organic Matter by Biofilms in Drinking Water Distribution Systems by :
Download or read book Utilization of Biodegradable Organic Matter by Biofilms in Drinking Water Distribution Systems written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biodegradable Organic Matter in Drinking Water Treatment and Distribution by : Michèle Prévost
Download or read book Biodegradable Organic Matter in Drinking Water Treatment and Distribution written by Michèle Prévost and published by . This book was released on 2005 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This compilation covers all aspects of biodegradable organic matter in drinking water by addressing the improvement made to water treatment and quality during the last 20 years. This book is a must for researchers and a valuable reference and guidance tool for all water producers.
Book Synopsis Control of Biofilm Growth in Drinking Water Distribution Systems by :
Download or read book Control of Biofilm Growth in Drinking Water Distribution Systems written by and published by . This book was released on 1992 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Biofilm Growth in Drinking Water Distribution Systems by : DIANE Publishing Company
Download or read book Control of Biofilm Growth in Drinking Water Distribution Systems written by DIANE Publishing Company and published by DIANE Publishing. This book was released on 1994-05 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the types of organisms often present in drinking water distribution system biofilms, how biofilms are established and grow, the public health problems associated with having biofilms in the distribution system, and tools that water treatment personnel can use to help control biofilm growth. Glossary of terms, and list of additional resources. Charts, tables and photos.
Book Synopsis Understanding the Impacts of Organic Matter on Microbial Biofilms in Engineered Drinking Water Systems by : Lei Li
Download or read book Understanding the Impacts of Organic Matter on Microbial Biofilms in Engineered Drinking Water Systems written by Lei Li and published by . This book was released on 2020 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing occurrence and severity of cyanobacterial harmful algal blooms (HABs) in freshwater have continuously challenged the safe drinking water supply. During HAB, public attention mainly focuses on the cyanotoxins, which associated with health issues, while HAB also generated massive amounts of algal cells, increasing the loading of algal organic matter (AOM) in the drinking water treatment plants (DWTPs). AOM is an algae-derived autochthonous natural organic matter (NOM), which contains high fraction of hydrophilic and nitrogenous compounds. Conventional treatment processes, comprised of coagulation, sedimentation, and granular media filtration, are known to be ineffective in completely removing NOM, including AOM [1, 2]. Although ozone has been widely adopted by water utilities to break down complex organic compounds and reduce DBP formation, ozonation practices can adversely increase concentrations of assimilable organic carbon (AOC), which in turn can be rapidly utilized and support biofilm growth in downstream filters and drinking water distribution systems [3, 4]. Currently, remain largely unknown for the growth of biofilms under the impacts of different NOM, including AOM in the filters and drinking water distribution systems (DWDSs). Therefore, the main research goal of this study is to investigate the impacts of organic matter on microbial biofilms in engineered drinking water systems (EDWSs). Specifically, the first objective of this study aimed to examine how the assembly processes and their associated factors (e.g., influent characteristics, biological interactions) drive the temporal dynamics of bacterial communities in full-scale BAC filters, which underwent ozone implementation to better handle the adverse effects of HABs. The obtained results revealed that along with the increase of bacterial taxonomic richness and evenness, stochastic processes became more crucial to determine the bacterial community assembly in the summer and autumn after ozone implementation. Moreover, their corresponding networks possessed simple network structures with lower modularity than other seasons, which implied lesser biological interactions among bacterial populations. Among the monitored physiochemical properties of filter influents, temperature and nutrient bioavailability (i.e., AOC concentrations) as well as biological interactions can be crucial drivers that impact the balance between these two processes and the taxonomic diversity of bacterial communities in BAC filters. The second objective of this study was to examine the effects of two widely present NOM, treated AOM and humic substances (HS), on biofilm development under unchlorinated DWDS conditions. Although great efforts have been made to remove NOM in DWTPs, remaining NOM still exists in the filter effluent and subsequently enter DWDSs. This unremoved NOM can support the growth of microbial biofilms in DWDS. Thus, the impact of AOM and HS on the formation, chemical composition, and microbial community structures of biofilms was evaluated. The 16S rRNA gene sequencing analyses revealed that the bacterial communities in biofilms were clustered with the organic matter types in bulk water, where Family Comamonadaceae was the most dominant but showed different temporal dynamics depending on the organic matter characteristics in bulk water. Higher diversity was observed in the biofilms grown in AOM-impacted bulk water (BFAOM) than biofilms grown in HS-impacted (BFHS) and R2A-impacted bulk water (BFR2A) as the biofilms matured. In addition, some taxa (e.g., Rhodobacteraceae, and Sphingomonadaceae) were enriched in BFAOM compared to BFHS and BFR2A. The biofilm image analysis results indicated that compared to BFHS, BFAOM and BFR2A had relatively thinner and heterogeneous physical structures with lower amounts of cell biomass, extracellular polymeric substances (EPS), and higher EPS protein/polysaccharide ratios. The third objective of this study was to elucidate how different types of organic matter, including AOM and HS, affect biomolecular compositions of biofilms and subsequent DBP formation. In order to control biofilm formation in DWDS, water utilities apply disinfectants such as chlorine or monochloramines. However, these applied disinfectants can lead to the formation of toxic DBPs due to the presence of organic-rich substances within biofilms. Therefore, the impact of organic matter composition on biomulecular composition of biofilms and their correlations with DBP formation were explored. The obtained results indicated that all biofilm samples comprised mostly of protein-like components (~90%), and to a lesser extent, humic-like components (~10%). Strong correlations were generally found between tryptophan-like substances and the studied DBP formation (R2min ≥ 0.76, P
Book Synopsis Innovative Biofilm Prevention Strategies by : Alex M. Bargmeyer
Download or read book Innovative Biofilm Prevention Strategies written by Alex M. Bargmeyer and published by International Water Assn. This book was released on 2005 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biofilms are ubiquitous in drinking water distribution systems, regardless of the type of treatment or disinfection employed by a utility. In general these biofilms pose no direct health threat unless their growth becomes excessive or pathogens that are inadvertently introduced into a distribution system become part of the biofilm microbial community. While biofilm can cause problems associated with taste and odor or corrosion, the possible presence and persistence of opportunistic pathogens within the biofilm may be the most important concern. Current methods employed to minimize biofilm include the use of residual disinfectants, reduction of organic matter or inorganic electron donors (e.g. ammonia) in the water, use of pipe materials and coatings that reduce the amount of biofilm accumulation, frequent flushing of pipelines, and the practice of corrosion control treatment when corroded iron pipes are present. New strategies for the control of biofilm are being discovered and tested in a wide variety of settings, but generally not within the context of drinking water distribution systems. It is therefore important to investigate the most promising new biofilm control strategies to determine their applicability to the very complex drinking water distribution system environment. The goal of this research was to investigate novel biofilm control strategies and technologies that could possibly be applied to drinking water systems. The intent of the research was to serve as an exploratory look at new control options and determine if any could warrant. Specific objectives of the work included: .Perform laboratory scale investigation of three control technologies using rotating annular reactors to simulate a drinking water distribution pipeline. .Select the most promising technology and test that technology in actual field settings under a variety of water quality and disinfectant conditions.
Book Synopsis Biofilm Dynamics in Drinking Water Biofiltration & Downstream Nanofiltration Biofouling by : Paul Markin
Download or read book Biofilm Dynamics in Drinking Water Biofiltration & Downstream Nanofiltration Biofouling written by Paul Markin and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural organic matter (NOM) is a concern in many surface waters and must be removed by water treatment processes for cost-effective production of safe and aesthetically pleasing drinking water. Biological filtration is an appealing NOM removal method due to its simplicity and low maintenance requirements. Biofiltration is not traditionally used in water treatment headworks, however biofiltration without pretreatment (BFwp) breaks with common practice to function as both particle and biodegradable NOM removal as a 1st stage process. BFwp makes use of indigenous microbial populations embedded in a biofilm matrix to remove biodegradable organic matter (BOM) from raw source water. This configuration is a viable pretreatment strategy for both low and high pressure membrane filtration due to its ability to remove both particulate and soluble BOM, thereby mitigating biofouling on the membrane surface. Biofouling has been described as the "Achille's heel" of membrane filtration (Flemming et al., 1997) due to its effects of increased operational cost and shortened membrane life-span. Therefore, a targeted effort is needed to understand how biofilter ecology affects performance both in the biofilter and downstream in membrane filtration units. Two parallel pilot scale BFwp units with dual-media were used in the current study for a seasonal characterisation of biofilter microbial dynamics and performance. Refurbishment of the biofilter pilot plant was performed by Dr. Ahmed Elhadidy and Brad Wilson, former students of the NSERC chair in water treatment. The current seasonal characterization spanned 14 months and made use of both new sample material as well as archived samples from Dr. Elhadidy. Biofilter media biomass was assessed using both adenosine tri-phosphate (ATP) and flow cytometric methods. Total protein, carbohydrate and free DNA of the media biofilm extracellular polymeric substances (EPS) were determined. Polymerase Chain Reaction - Denaturing Gradient Gel Electrophoresis (PCR-DGGE) was used to create microbial community fingerprint profiles of the biofilter feed and media. It was found that source water quality played a significant role in shaping BFwp microbial communities. Multivariate analysis of the PCR-DGGE fingerprints showed a media biofilm community shift occurred in response to high ammonia, high low molecular weight acids (LMW-acids) concentrations in the raw feed during January-February 2015. This low temperature, high ammonia and LMW-acids induced shift was accompanied by a rise in media biomass and EPS. Lower DOC and biopolymer removals were observed during the January-February 2015 community shift, however this was attributed largely to the effects which lower feed temperatures have on microbial biodegradation kinetics. No differences were found in community structures between media types, depths, or biofilter columns, however source water exhibited lower diversities and markedly different community structure than those of media biofilms. It was determined that media diversity and richness were high and did not exhibit seasonal fluctuations. As such these parameters could not be reliably related to biofilter DOC and biopolymer removal performance. In his investigation of biofiltration as a pretreatment for nanofiltration (NF), Dr. Elhadidy archived samples for molecular analysis that were used in the current study. PCR-DGGE was performed on extracted DNA from source water, media, and fouled membrane samples for bacteria, archaea, and fungi. Archaea were present in all samples, however their abundance was roughly 1000 fold less than bacteria, which made it difficult to assess their significance in the biofiltration and NF processes. Fungi were only screened for in one media and one source water sample during method development; both samples were positive. Archaeal community organisation was similar to that of bacteria during the autumn BF-NF experiment, however no community organisation was discernible during the winter experiment. Bacterial community structures from the autumn experiment showed that fouled NF membranes fed raw water clustered together with biofilter media, indicating feed water rather than substrate material influences bacterial community organisation. Comparatively, NF membranes fed with biofilter effluent produced a cluster of drastically dissimilar bacterial communities, which corresponded with improved flux and reduced biofoulant biomass. The microbial communities of biofiltration exhibited dynamic responses to feed water quality in both the seasonal and the nanofiltration studies. Biomass and EPS were highly correlated and their levels changed in response to community shifts, which in the seasonal and nanofiltration studies, were precipitated by changes in feed ammonia and BOM.
Book Synopsis Biofilms in Drinking Water Distribution Systems by : Xiaoli Qin
Download or read book Biofilms in Drinking Water Distribution Systems written by Xiaoli Qin and published by . This book was released on 2009 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Biofilm on Disinfection Byproducts Formation and Decay in a Simulated Water Distribution System by : Zhikang Wang
Download or read book Influence of Biofilm on Disinfection Byproducts Formation and Decay in a Simulated Water Distribution System written by Zhikang Wang and published by . This book was released on 2013 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since biofilm has been implicated in the deterioration water quality and the increase of public health risks, various efforts have been made to minimize biofilm regrowth in drinking water distribution systems. Although traditional water treatment processes can greatly remove a large fraction of disinfection by-products (DBPs) precursors, a small portion of natural organic matter (NOM) may still enter water distribution systems. Untreated NOM can serve as nutrients for biofilm growth while also consuming maintained disinfection residuals, which can result in microbial contamination in drinking water. To suppress biofilm formation, water utilities maintain disinfectant residuals for the distribution system. However, upon disinfectant addition, toxic DBPs are inevitably produced. Biofilm and its secreted extracellular polymeric substances (EPS) produce toxic DBPs, due to the very similar chemical composition compared to traditional investigated DBP precursors. This research investigated the role of biofilm on DBP formation and decay in simulated drinking water distribution systems with four objectives. The first objective was to investigate the influence of chemical composition and quantity of bacterial EPS on the biosorption of NOM in drinking water. Results indicated that both protein and polysaccharide based EPS adsorbed existing NOM. Biosorption capacity was mainly determined by divalent ion (Ca2+ and Mg2+) concentrations. Mechanistically, the presence of a diffuse electrical double layer inhibited NOM biosorption by potential energy barriers, however, presence of divalent ions in the aquatic environment enhanced biosorption processes, permitting functional group interactions between EPS and NOM. In addition, hydrophobic interactions, EPS characteristics and quantity can also be used to explain biosorption results. Bridging between hydrophilic carboxyl groups on alginate EPS and NOM appeared to be the dominant form of biosorption, while hydrophobic interactions enhanced biosorption for protein-based EPS. The second and third objectives of this study were to investigate the role of biofilm EPS on the formation of both carbonaceous DBPs (C-DBPs) and nitrogenous DBPs (N-DBPs). DBP yield (formation potential) tests of both bacterial culture and extracted EPS indicated that the chemical composition and quality of EPS played a critical role for DBP formation. In general, protein based EPS possessed higher DBP yields compared to polysaccharide based EPS, especially for N-DBPs. To further determine the relative contribution of each biomolecule in EPS to DBP formation and speciation, detailed chemical compositions of biomolecules in EPS (amino acids, polysaccharide monomers, and fatty acids) from both pure culture and mixed species biofilm isolated from a water utility were analyzed. DBP yield results from both extracted EPS and EPS surrogates (amino acids and polysaccharide monomers) indicated that proteins in EPS have a greater impact on DBP formation, where amino acids containing unsaturated organic carbon or conjugated bonds in R-group produced higher amount of DBPs. However, DBP yields of polysaccharide monomers were lower than those of tested amino acids groups and the DBP yields were not significantly influenced by their chemical structures. The last objective of this study was to understand the influence of biofilm on DBP formation and decay in a simulated water distribution system using lab scale annular reactors. For Cl2 disinfection at 0.5 mg L-1 Cl2 residual concentration, no obvious DBP formation was observed. This was mainly due to the combination of low DBP formation, DBP volatilization, and biodegradation. However, when high Cl2 residuals were maintained, the formations of both C-DBPs and N-DBPs increased dramatically beyond the DBP formation potential of the feed solution. This suggests higher Cl2 residual not only reacted with humic acid (HA) in feed solution but also reacted with biofilm and produced extra DBPs, especially the high formation of N-DBPs (haloacetonitriles). For NH2Cl disinfection, the DBP levels were much lower than those of Cl2 disinfection and differences in DBP formation were not significant under different NH2Cl residual concentrations. Combined results suggested that biofilm can impact both C-DBP and N-DBP formation and decay in water distribution systems, where biomolecules in EPS affect DBP speciation.
Book Synopsis Removal of Biodegradable Organic Matter in Drinking Water Biofilters by : Raymond M. Hozalski
Download or read book Removal of Biodegradable Organic Matter in Drinking Water Biofilters written by Raymond M. Hozalski and published by . This book was released on 1996 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biofilms in Drinking Water Distribution Systems by :
Download or read book Biofilms in Drinking Water Distribution Systems written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Biofilm Growth in Drinking Water Distribution Systems by :
Download or read book Control of Biofilm Growth in Drinking Water Distribution Systems written by and published by . This book was released on 1992 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monitoring Biostability and Biofilm Formation Potential in Drinking Water Distribution Systems by : Kowho Pearl Useh
Download or read book Monitoring Biostability and Biofilm Formation Potential in Drinking Water Distribution Systems written by Kowho Pearl Useh and published by . This book was released on 2017 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Role of Extracellular Polymeric Substances (EPS) on Biofilm Disinfection in a Model Drinking Water Distribution System by : Zheng Xue
Download or read book Role of Extracellular Polymeric Substances (EPS) on Biofilm Disinfection in a Model Drinking Water Distribution System written by Zheng Xue and published by . This book was released on 2012 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biofilms are undesirable but ubiquitous in drinking water systems. This study investigated the role of extracellular polymeric substances (EPS) in the biofilm life cycle, including planktonic cells, attached biofilm, detached biofilm clusters and redistributed biofilm, in a model distribution system with minimal disinfectant residuals. EPS contributed to bacterial surface properties, biofilm structural characteristics, disinfectant diffusion and reaction, organic matter retention and utilization, hence playing pivotal roles in bacterial resistance to disinfectants. Strains from an opportunistic pathogen, Pseudomonas aeruginosa with different EPS secretion capabilities were tested. Two major components in P. aeruginosa EPS, polysaccharides and proteins, both reacted rapidly with chlorine while monochloramine reacted specifically with proteins. The impact of biofilm EPS reactivity with disinfectants on disinfection efficacy was evaluated by monitoring planktonic bacteria viability, disinfectant decay, biofilm viability, biofilm structure, and detached biofilm viability as well as their redistribution, systematically during the disinfection process. The obtained results suggested that the presence of EPS increased the resistance of planktonic bacteria, biofilm and detached biofilm to both chlorine and monochloramine. The EPS reactivity led to different protection approaches for bacterial cells, acting either as a disinfectant consumer (for chlorine inactivation) or limiting access to reactive sites on a cell membrane (for monochloramine inactivation). The biofilm structure characterization using confocal laser scanning microscopy (CLSM) revealed that EPS production affected biofilm structure, specifically surface roughness, surface area to volume ratio and average diffusion distance. These structural characteristics were closely related to overall biofilm viability and the spatial distribution of viability within biofilms. Although the overall viable ratios were similar under the two disinfectants for each strain, monochloramine penetrated deeper into biofilm matrix than chlorine regardless the quantity of EPS content, showing a higher inactivation efficacy in the middle section of biofilms. However, chlorine was more efficient in controlling planktonic and detached cluster viability than monochloramine. The combined results suggested that different reactivity of biofilm EPS with disinfectants influenced the susceptibility of both biofilm and detached biofilm during the disinfection practices. This study provides valuable insight for both fundamental studies of biofilm life cycle and disinfection practices to optimize water quality maintenance in distribution systems.
Book Synopsis Biofilm Highlights by : Hans-Curt Flemming
Download or read book Biofilm Highlights written by Hans-Curt Flemming and published by Springer Science & Business Media. This book was released on 2011-08-02 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Living in biofilms is the common way of life of microorganisms, transiently immobilized in their matrix of extracellular polymeric substances (EPS), interacting in many ways and using the matrix as an external digestion and protection system. This is how they have organized their life in the environment, in the medical context and in technical systems – and has helped make them the oldest, most successful and ubiquitous form of life. In this book, hot spots in current biofilm research are presented in critical and sometimes provocative chapters. This serves a twofold purpose: to provide an overview and to inspire further discussions. Above all, the book seeks to stimulate lateral thinking.
Book Synopsis Organic Pollutants in the Water Cycle by : Thorsten Reemtsma
Download or read book Organic Pollutants in the Water Cycle written by Thorsten Reemtsma and published by John Wiley & Sons. This book was released on 2006-12-13 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first in-depth and comprehensive reference on the most pertinent polar contaminant classes and their behavior in the whole water cycle includes, among others, industrial chemicals, consumer products, polar herbicides and pharmaceuticals. All chapters are uniformly structured, covering properties, pollution sources, occurrence in wastewater, surface water, and groundwater as well as water treatment aspects, while ecotoxicological and assessment aspects are also covered. Among the authors are leading experts in their relevant fields, many of whom provide here groundbreaking research results. The result is an up-to-date information source for researchers and professionals working in water quality monitoring, water supply, or wastewater treatment, as well as environmental and water chemists, geochemists, ecologists, chemists and engineers.
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