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Chlorine Disinfection of Blended Wastewater Effluents

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Flow to publicly owned treatment works (POTWs) increases during wet weather events, due to intrusion of storm water into sanitary collection systems and use of combined sewer systems. When such flows exceed the hydraulic capacity of a POTW alternate flow management techniques must be employed to ensure that the integrity of the POTWs unit processes are not compromised. One technique is to treat influent flows through primary clarification and limit the flow to the secondary treatment units to design limits. Excess flow from the primary clarifiers, which by-passes secondary treatment, is then recombined or "blended" with secondary effluents and disinfected. During the blending process particulate matter within primary effluent can reduce the effectiveness of disinfection. It is possible that the size of these particles may be related to the degree of protection observed for microbes during the disinfection step. In addition, ammonia and other related organic compounds in blended waste waters will react with chlorine producing chloramines, and other combined chlorine species which reduce the disinfectant's effectiveness for killing or inactivating pathogens. The objectives of this work are to determine the effectiveness of chlorine disinfection on a variety of microbial indicators within blended effluents, and to compare the disinfection results with specific water quality parameters for the purpose of developing a model for chlorine disinfection of blended effluents.
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Document Type: Research Article

Publication date: 2007-10-13

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