Features

August 2014, Vol. 26, No.8

Put your energy inefficiency to work  

Energy savings performance contracts yield financial savings as utilities are learning there’s a lot to be gained from inefficiency 

Feature 1 - ESPC Pete Thomson, Michael Hanna, Chuck Boepple, and Jesse Moffett
How do you keep rates low while responding to increasingly demanding regulations, escalating operating costs, and aging infrastructure? If you’re interested in the solution, you’re undoubtedly a water or wastewater utility manager. If you’ve already found a solution, you’ve probably discovered an energy savings performance contract (ESPC). Read full article (login required) 

 

A process of elimination 

A new entrant in sewer evaluations removes unlikely I/I sources first, saving resources for priority areas 

Feature 5 - infiltration Rich McGillis, John M.H. Barton, and Joseph Kamalesh
Facing compliance with a 2007 consent decree to address combined sewer overflows and sanitary sewer overflows (SSOs), Kentucky’s Sanitation District 1 (SD1; Fort Wright, Ky.) turned to micromonitoring. The micromonitoring program quickly can identify sewer pipes high in inflow and infiltration (I/I) or, more importantly, pipes with zero I/I. Read full article (login required) 

 

It’s a small world after all 

A highly visible decentralized reuse facility in Anaheim, Calif., demonstrates innovative technological, as well as practical, approaches to water recycling and conservation 

Feature 6 - anaheim Zakir Hirani, John Ciccotelli, Michael Moore, and William Moorhead

With increasing population and uncertainty about the long-term sustainability of clean water sources, many cities are investigating water reuse to complement their water supplies. The City of Anaheim, the 10th largest city in California and home to Disneyland, is one such city. 

To increase public awareness for water conservation and recycling, the city hired MWH (Broomfield, Colo.) to design a 400,000-L/d (106,000-gal/d) decentralized water resource recovery facility (WRRF) that produces disinfected tertiary effluent on a Water Sustainability Campus. The WRRF demonstrates water conservation features for public education in a highly visible and beautiful setting near the city hall. Read full article (login required) 

 

Operations Forum Features

Divide and conquer ammonia to save energy 

Energy efficiency upgrades slash power bill, improve compliance and operability

Feature 2 - american canyon Edward C. Myers and Peter Lee

The City of American Canyon Wastewater Treatment Plant sits in Napa County, Calif., in the wine country of Northern California. The water resource recovery facility (WRRF) was commissioned in 2002 as one of the first to implement membrane bioreactor (MBR) technology in California. It is designed to handle an average dry weather flow of 9500 m3/d (2.5 mgd) and a peak wet weather flow of 19,000 m3/d (5 mgd). It currently serves approximately 20,000 residents, along with businesses that include large food processors and other industrial dischargers.   

In 2012, the WRRF completed a project to optimize its nitrogen removal as well as reduce its energy use. Read full article (login required)  

 

Sensor calibration, maintenance, and validation 

Lessons learned from operating advanced instrumentation to support nutrient removal 

Feature 3 - sensors Phill Yi, Wendell O. Khunjar, Katya Bilyk, Ron Latimer, Paul Pitt, Charles Bott, Maureen O’Shaughnessy, and Michael Rumke
Analytical devices are emerging as an integral component of water resource recovery facilities (WRRFs); these devices help automate data collection and can be used for controlling operations. To facilitate more widespread adoption of sensors for beneficial use at WRRFs, there is a need to increase knowledge transfer among utilities regarding best practices for selection of appropriate sensors, as well as appropriate methods of maintenance, calibration, and data validation. Standardizing approaches and identifying strategies for troubleshooting problematic sensors can help counteract any distrust in sensor data quality and accuracy in measurements. Read full article (login required) 

 

Mercury falling 

How a facility upgrade intended to reduce algae growth resulted in unintended (yet favorable) consequences 

Feature 4 - mercury Robert Brent, Ross Morland, David Berberich, Spencer Davis, Brandon Foltz, and Kurt Drummond

While most residents generally are concerned about the health of local rivers, lakes, and estuaries, often it is difficult for them to see the immediate benefits of costly facility upgrades, especially for a waterbody more than 480 km (300 mi) downstream. The City of Waynesboro, Va., faced this challenge when it upgraded the Waynesboro Wastewater Treatment Plant in 2010 to meet newly promulgated Virginia nutrient regulations for dischargers within the Chesapeake Bay watershed. 

To demonstrate that nutrient reductions aimed at reducing eutrophication in the bay also could improve local water quality, the city partnered with researchers from James Madison University (JMU; Harrisonburg, Va.) to study water quality improvements to the South River throughout the upgrades. While the main objective — to reduce algal growth — was not necessarily achieved, a surprising side benefit was the possible reduction in methylmercury accumulation within this mercury-impaired stream. Read full article (login required)