April 2011, Vol. 23, No.4

Maximum benefits

Upgrade provides biological nutrient removal despite unusually high phosphorus loading 

middle basin feature art John Keller, John O’Neil, John Metzler, Ed Kobylinski, and Matt Bond

The recently completed expansion of the Johnson County Wastewater (JCW) Douglas L. Smith Middle Basin Treatment Plant in Overland Park, Kan., will improve water quality far beyond county boundaries. Completed last June, the Middle Basin expansion is among the first in the Kansas City metropolitan area to incorporate biological nutrient removal (BNR) to reduce phosphorus and nitrogen discharges. Not only will this improve local water quality, but it also will help reduce hypoxia problems in the Gulf of Mexico. Read full article (login required) 


Same plant, better results

Achieving enhanced nutrient removal without new construction 

swatara feature Art M. Casey Whittier, John Olson, Mark Pamperin, and Betty-Ann Curtis

How does a community meet changing requirements for biological nutrient removal in a cost-effective     manner? This question affects more communities across the United States as more stringent nutrient regulations are applied. To answer this question, designers must balance many factors, including capital costs between new construction and retrofits, footprint restrictions, energy use, ease of operation, process stability, and operations and maintenance costs. While each treatment plant and set of conditions is different, there is a process that can be applied to any upgrade evaluation to find the best and least costly solution. Read full article (login required) 


Operations Forum Features

Remote gate control maximizes interceptor storage and minimizes CSOs 

Lowell, Mass., uses real-time remote control to reduce combined sewer overflows

Lowell feature Art James S. Drake, Mark Young, and Michael Stuer

The Lowell Regional Wastewater Utility (LRWWU; Lowell, Mass.) operates a major combined sewer system (CSS) with average annual untreated combined sewer overflow (CSO) discharges in the billions of liters. In 2002, the utility began work to use remote data collection and equipment control to capture more flow.

Over the last 8 years, LRWWU constructed and installed a comprehensive supervisory control and data acquisition (SCADA) system to manage and remotely operate its nine CSO stations based on real-time flow conditions. Remote activation of these diversion structures provides significant opportunities to respond more quickly to changing storm conditions to reduce CSOs and to increase the operational flexibility of the CSS.

The SCADA control system also provides LRWWU with the opportunity to maximize the use of inline interceptor pipe storage by remotely and automatically operating CSO diversion and flow control gates to capture wet weather flow. Read full article (login required)


Introducing FOG to solids

A sticky proposition

FOG feature art Tom Johnson, Tim Shea, Dale Gabel, and Bob Forbes

Rising energy prices prompt interest in energy recovery, which in turn promotes innovations in handling fats, oils, and grease (FOG). To ensure that new systems are successful, it is essential that wastewater management professionals share their experiences with various approaches. Read full article (login required) 

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