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Microbial dark repair after UV disinfection in municipal wastewater : A study of Waukesha, WI WWTP effluent potential dark repair after UV disinfection : a report submitted to the faculty of the Milwaukee School of Engineering in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering / by Lewis Blaszczyk.

by Blaszczyk, Lewis, author., Milwaukee School of Engineering

Water -- Purification

Sewage -- Purification

Ultraviolet radiation -- Industrial applications.

Wastewater -- Treatment and disposal

Sewage disposal plants

90 leaves : illustrations, some of which are in color ; 29 cm.

Introduction -- Background -- Literature review -- Materials and methods -- Results -- Conclusions and recommendations -- Appendix A: Sampling forms / test results log -- B: Complete data table and standard deviation graph versus incubation period -- C: MiniTab statistical analysis : Initial [FC]>5 total FCU/100mL -- D: MiniTab statistical analysis: Initial [FC]<100 total FCU/100mL, but >5 total FCU/100mL -- E: MiniTab statistical analysis: Initial [FC]>=100 total FCU/100mL -- F: Life cycle cost.

Ultraviolet radiation (UVR) is a popular water disinfection process that gained popularity and acceptance beginning in the 1970s. There are several factors that make UVR disinfection a robust selection for disinfection. This report explains why Waste Water Treatment Plants (WWTPs) are selecting UVR for final disinfection treatment. However, while UVR is capable of reliably reducing microbial levels below required discharge limits, there is a concern that the UVR process does not result in effective long-term disinfection. The idea of microbial reactivation after UVR is the research focus of this report. Through the use of a literature review, laboratory experimentation, and statistical analysis, microbial repair after UVR was investigated. Using bench-top scale experimentation, an analysis of actual municipal wastewater (WW) from the Waukesha, Wisconsin WWTP was undertaken to explore the possibility of microbial repair during pipe transport to final discharge. The Waukesha WWTP plant was the focus of this investigation, because the municipality is considering a proposal in which it would divert water from the Lake Michigan watershed. This would then result with then need to return the same water volume back to the Lake Michigan watershed, which would be accomplished by pipeline transport. If microbial repair were to occur at significant levels in the final discharge pipeline, this occurrence could result in the need to spend hundreds of thousands of capital to build second disinfection process at the point of final discharge. In this investigation, three pipe travel times for the UVR-treated water were investigated, including 5.9 hours, 14 hours, and 21 hours. The result of the investigation was that significant microbial repair was not observed. A Life Cycle Cost was then undertaken to compare two different UVR technologies. This aim of this project is to provide preliminary understanding of the potential for microbial activity during the proposed pipeline transport.

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