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WEFTEC, the largest event of its kind in North America, offers water quality professionals the best in water quality education and training. With almost 200 technical sessions, workshops, mobile sessions, local facility tours and 1,000+ exhibitors, it is the premier water conference! The WEFTEC technical program is selected through a rigorous, peer-review process, ensuring that attendees experience the highest-quality education. WEFTEC speakers are experts and innovators, leading the way in water quality. The following paper was presented at WEFTEC 2019.

This paper reviews the use of ozone as a disinfectant for wastewater over the last 30 years. A historical usage profile of ozone disinfection by Publicly Owned Treatment Works (POTWs) is presented along with some insights focused on the evolution of ozone generation equipment and ozone transfer and contactor design.The historical usage profile was developed from the literature and work performed...

Since the mid 1970’s the wastewater industry has been busy conducting sanitary sewer evaluation studies (SSES) to identify the most cost effective way of reducing wet weather flows. These studies, over the last 30 years, have involved from very rudimentary flow measurement efforts and limited field investigations to extremely sophisticated condition assessment databases with extensive...

It has been 30 years since the 100th Congress passed the Water Quality Act (WQA) of 1987, establishing todays framework of storm water regulation within the United States. Today, over 80 percent of the population of the United States lives in a political jurisdiction subject to storm water permitting. This paper recounts 30 years of storm water permitting experience, offering the regulated...

 

Lake Mead was formed by the construction of Hoover Dam. It is the largest man made reservoir in the United States. In 1956 both the City of Las Vegas (197.2 L/s) (4.5mgd) and Clark County (52.6 L/s) (1.2mgd) began discharging wastewater into the Las Vegas Wash, which flows into Lake Mead. In 1965 the Bureau of Reclamation (BOR) began filling Lake Powell. As a result the level of Lake Mead dropped...

The Florida Department of Transportation (FDOT) proposed improvements to Interstate 275 within the City of Tampa. The Interstate improvements necessitated the adjustment of numerous City of Tampa wastewater collection facilities including the Clark Avenue Interceptor; a 42-inch diameter, plastic sheet lined, reinforced concrete pipe (RCP), gravity flow sanitary sewer with approximately 15 MGD...

In 2012, Miami-Dade Water and Sewer Department (MDWASD) selected the Poole & Kent/Brown and Caldwell (PK/BC) design-build team to update its existing cogeneration system at the South District Water Reclamation Facility (WRF). The existing system consisted of three 900-kilowatt (kW) Superior engine generators with high-pressure gas storage and minimal digester gas treatment. The goals for the...

In collaboration with more than 40 partners, Clean Water Services’ integrated watershed practices achieve impressive results in improving the Tualatin River Watershed in Oregon, United States.

Patterned after the TV news show “60 Minutes”, four participants trade off in making “one minute ideas” on community outreach, public image, how to work with the media and working with elected officials. In round robin-fashion, the panel covers 15 ideas for each topic for a total of 60 ideas. This fast-paced and entertaining panel delivers user-friendly communications and...

Currently in commissioning and testing and planned for operation in late 2007, the Groundwater Replenishment (GWR) System in Fountain Valley, California is jointly sponsored by Orange County Water District (OCWD) and the Orange County Sanitation District (OCSD). It is an indirect potable reuse project that will initially produce 70 million gallons per day (mgd) of highly treated recycled water for...

In Sweet Home, Oregon, flow monitoring and hydrologic modeling evaluations predict a 20:1 ratio of peak hour 5-year recurrence flows to average summer flows. These, and lower peaks overwhelm the capacity of the collection system and the wastewater treatment plant (WWTP), causing sanitary sewer overflows (SSOs) into the South Santiam River, a salmonbearing water body that also serves as a drinking...