Effects of Wastewater Disinfection on Waterborne Bacteria and Viruses

Wastewater disinfection is practiced with the goal of reducing risks of human exposure to pathogenic microorganisms. In most circumstances, the efficacy of a wastewater disinfection process is regulated and monitored based on measurements of the responses of indicator bacteria. However, inactivation...

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Veröffentlicht in:Water environment research 2007-01, Vol.79 (1), p.81-92
Hauptverfasser: Blatchley, Ernest R., Gong, Woei-Long, Alleman, James E., Rose, Joan B., Huffman, Debra E., Otaki, Masahiro, Lisle, John T.
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container_issue 1
container_start_page 81
container_title Water environment research
container_volume 79
creator Blatchley, Ernest R.
Gong, Woei-Long
Alleman, James E.
Rose, Joan B.
Huffman, Debra E.
Otaki, Masahiro
Lisle, John T.
description Wastewater disinfection is practiced with the goal of reducing risks of human exposure to pathogenic microorganisms. In most circumstances, the efficacy of a wastewater disinfection process is regulated and monitored based on measurements of the responses of indicator bacteria. However, inactivation of indicator bacteria does not guarantee an acceptable degree of inactivation among other waterborne microorganisms (e.g., microbial pathogens). Undisinfected effluent samples from several municipal wastewater treatment facilities were collected for analysis. Facilities were selected to provide a broad spectrum of effluent quality, particularly as related to nitrogenous compounds. Samples were subjected to bench-scale chlorination and dechlorination and UV irradiation under conditions that allowed compliance with relevant discharge regulations and such that disinfectant exposures could be accurately quantified. Disinfected samples were subjected to a battery of assays to assess the immediate and long-term effects of wastewater disinfection on waterborne bacteria and viruses. In general, (viable) bacterial populations showed an immediate decline as a result of disinfectant exposure; however, incubation of disinfected samples under conditions that were designed to mimic the conditions in a receiving stream resulted in substantial recovery of the total bacterial community. The bacterial groups that are commonly used as indicators do not provide an accurate representation of the response of the bacterial community to disinfectant exposure and subsequent recovery in the environment. UV irradiation and chlorination/dechlorination both accomplished measurable inactivation of indigenous phage; however, the extent of inactivation was fairly modest under the conditions of disinfection used in this study. UV irradiation was consistently more effective as a virucide than chlorination/dechlorination under the conditions of application, based on measurements of virus (phage) diversity and concentration. Taken together, and when considered in conjunction with previously published research, the results of these experiments illustrate several important limitations of common disinfection processes as applied in the treatment of municipal wastewaters. In general, it is not clear that conventional disinfection processes, as commonly implemented, are effective for control of the risks of disease transmission, particularly those associated with viral pathogens. Microbial quality in
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In most circumstances, the efficacy of a wastewater disinfection process is regulated and monitored based on measurements of the responses of indicator bacteria. However, inactivation of indicator bacteria does not guarantee an acceptable degree of inactivation among other waterborne microorganisms (e.g., microbial pathogens). Undisinfected effluent samples from several municipal wastewater treatment facilities were collected for analysis. Facilities were selected to provide a broad spectrum of effluent quality, particularly as related to nitrogenous compounds. Samples were subjected to bench-scale chlorination and dechlorination and UV irradiation under conditions that allowed compliance with relevant discharge regulations and such that disinfectant exposures could be accurately quantified. Disinfected samples were subjected to a battery of assays to assess the immediate and long-term effects of wastewater disinfection on waterborne bacteria and viruses. In general, (viable) bacterial populations showed an immediate decline as a result of disinfectant exposure; however, incubation of disinfected samples under conditions that were designed to mimic the conditions in a receiving stream resulted in substantial recovery of the total bacterial community. The bacterial groups that are commonly used as indicators do not provide an accurate representation of the response of the bacterial community to disinfectant exposure and subsequent recovery in the environment. UV irradiation and chlorination/dechlorination both accomplished measurable inactivation of indigenous phage; however, the extent of inactivation was fairly modest under the conditions of disinfection used in this study. UV irradiation was consistently more effective as a virucide than chlorination/dechlorination under the conditions of application, based on measurements of virus (phage) diversity and concentration. Taken together, and when considered in conjunction with previously published research, the results of these experiments illustrate several important limitations of common disinfection processes as applied in the treatment of municipal wastewaters. In general, it is not clear that conventional disinfection processes, as commonly implemented, are effective for control of the risks of disease transmission, particularly those associated with viral pathogens. Microbial quality in receiving streams may not be substantially improved by the application of these disinfection processes; under some circumstances, an argument can be made that disinfection may actually yield a decrease in effluent and receiving water quality. Decisions regarding the need for effluent disinfection must account for site-specific characteristics, but it is not clear that disinfection of municipal wastewater effluents is necessary or beneficial for all facilities. When direct human contact or ingestion of municipal wastewater effluents is likely, disinfection may be necessary. Under these circumstances, UV irradiation appears to be superior to chlorination in terms of microbial quality and chemistry and toxicology. 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Desalination ; Effluents ; Exact sciences and technology ; Fecal coliforms ; General purification processes ; Irradiation ; Oxygen - metabolism ; Pollution ; RESEARCH PAPERS ; Ultraviolet Rays ; United States ; virus ; Viruses - drug effects ; Viruses - growth &amp; development ; Viruses - radiation effects ; Wastewater ; Wastewater treatment ; Wastewaters ; Water Microbiology ; Water pollution ; Water Purification - methods ; Water Purification - standards ; Water treatment ; Water treatment and pollution</subject><ispartof>Water environment research, 2007-01, Vol.79 (1), p.81-92</ispartof><rights>2007 WATER ENVIRONMENT FEDERATION (WEF)</rights><rights>2007 Water Environment Federation</rights><rights>2008 INIST-CNRS</rights><rights>Copyright Water Environment Federation Jan 2007</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5601-e49d146bd7c24d31f219b77796847581db728c54b5317e811489db82f2e660b23</citedby><cites>FETCH-LOGICAL-c5601-e49d146bd7c24d31f219b77796847581db728c54b5317e811489db82f2e660b23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/23805205$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/23805205$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,780,784,803,1417,4024,27923,27924,27925,45574,45575,58017,58250</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&amp;idt=18751926$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17290975$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Blatchley, Ernest R.</creatorcontrib><creatorcontrib>Gong, Woei-Long</creatorcontrib><creatorcontrib>Alleman, James E.</creatorcontrib><creatorcontrib>Rose, Joan B.</creatorcontrib><creatorcontrib>Huffman, Debra E.</creatorcontrib><creatorcontrib>Otaki, Masahiro</creatorcontrib><creatorcontrib>Lisle, John T.</creatorcontrib><title>Effects of Wastewater Disinfection on Waterborne Bacteria and Viruses</title><title>Water environment research</title><addtitle>Water Environ Res</addtitle><description>Wastewater disinfection is practiced with the goal of reducing risks of human exposure to pathogenic microorganisms. In most circumstances, the efficacy of a wastewater disinfection process is regulated and monitored based on measurements of the responses of indicator bacteria. However, inactivation of indicator bacteria does not guarantee an acceptable degree of inactivation among other waterborne microorganisms (e.g., microbial pathogens). Undisinfected effluent samples from several municipal wastewater treatment facilities were collected for analysis. Facilities were selected to provide a broad spectrum of effluent quality, particularly as related to nitrogenous compounds. Samples were subjected to bench-scale chlorination and dechlorination and UV irradiation under conditions that allowed compliance with relevant discharge regulations and such that disinfectant exposures could be accurately quantified. Disinfected samples were subjected to a battery of assays to assess the immediate and long-term effects of wastewater disinfection on waterborne bacteria and viruses. 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When direct human contact or ingestion of municipal wastewater effluents is likely, disinfection may be necessary. Under these circumstances, UV irradiation appears to be superior to chlorination in terms of microbial quality and chemistry and toxicology. This advantage is particularly evident in effluents that contain appreciable quantities of ammonia-nitrogen or organic nitrogen.</description><subject>Antiseptics</subject><subject>Applied sciences</subject><subject>Bacteria</subject><subject>Bacteria - drug effects</subject><subject>Bacteria - growth &amp; development</subject><subject>Bacteria - radiation effects</subject><subject>Bacteriophages</subject><subject>Chlorination</subject><subject>Chlorine</subject><subject>Chlorine - pharmacology</subject><subject>Disinfectants - pharmacology</subject><subject>Disinfection</subject><subject>Disinfection - methods</subject><subject>Disinfection - standards</subject><subject>Drinking water and swimming-pool water. 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In most circumstances, the efficacy of a wastewater disinfection process is regulated and monitored based on measurements of the responses of indicator bacteria. However, inactivation of indicator bacteria does not guarantee an acceptable degree of inactivation among other waterborne microorganisms (e.g., microbial pathogens). Undisinfected effluent samples from several municipal wastewater treatment facilities were collected for analysis. Facilities were selected to provide a broad spectrum of effluent quality, particularly as related to nitrogenous compounds. Samples were subjected to bench-scale chlorination and dechlorination and UV irradiation under conditions that allowed compliance with relevant discharge regulations and such that disinfectant exposures could be accurately quantified. Disinfected samples were subjected to a battery of assays to assess the immediate and long-term effects of wastewater disinfection on waterborne bacteria and viruses. In general, (viable) bacterial populations showed an immediate decline as a result of disinfectant exposure; however, incubation of disinfected samples under conditions that were designed to mimic the conditions in a receiving stream resulted in substantial recovery of the total bacterial community. The bacterial groups that are commonly used as indicators do not provide an accurate representation of the response of the bacterial community to disinfectant exposure and subsequent recovery in the environment. UV irradiation and chlorination/dechlorination both accomplished measurable inactivation of indigenous phage; however, the extent of inactivation was fairly modest under the conditions of disinfection used in this study. UV irradiation was consistently more effective as a virucide than chlorination/dechlorination under the conditions of application, based on measurements of virus (phage) diversity and concentration. Taken together, and when considered in conjunction with previously published research, the results of these experiments illustrate several important limitations of common disinfection processes as applied in the treatment of municipal wastewaters. In general, it is not clear that conventional disinfection processes, as commonly implemented, are effective for control of the risks of disease transmission, particularly those associated with viral pathogens. Microbial quality in receiving streams may not be substantially improved by the application of these disinfection processes; under some circumstances, an argument can be made that disinfection may actually yield a decrease in effluent and receiving water quality. Decisions regarding the need for effluent disinfection must account for site-specific characteristics, but it is not clear that disinfection of municipal wastewater effluents is necessary or beneficial for all facilities. When direct human contact or ingestion of municipal wastewater effluents is likely, disinfection may be necessary. Under these circumstances, UV irradiation appears to be superior to chlorination in terms of microbial quality and chemistry and toxicology. This advantage is particularly evident in effluents that contain appreciable quantities of ammonia-nitrogen or organic nitrogen.</abstract><cop>Alexandria, VA</cop><pub>Water Environment Federation</pub><pmid>17290975</pmid><doi>10.2175/106143006x102024</doi><tpages>12</tpages></addata></record>
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subjects Antiseptics
Applied sciences
Bacteria
Bacteria - drug effects
Bacteria - growth & development
Bacteria - radiation effects
Bacteriophages
Chlorination
Chlorine
Chlorine - pharmacology
Disinfectants - pharmacology
Disinfection
Disinfection - methods
Disinfection - standards
Drinking water and swimming-pool water. Desalination
Effluents
Exact sciences and technology
Fecal coliforms
General purification processes
Irradiation
Oxygen - metabolism
Pollution
RESEARCH PAPERS
Ultraviolet Rays
United States
virus
Viruses - drug effects
Viruses - growth & development
Viruses - radiation effects
Wastewater
Wastewater treatment
Wastewaters
Water Microbiology
Water pollution
Water Purification - methods
Water Purification - standards
Water treatment
Water treatment and pollution
title Effects of Wastewater Disinfection on Waterborne Bacteria and Viruses
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