Increasing Backwash Efficiency

The North Columbus (Ga.) Resource Facility recently completed a $12-million replacement of its settled water filtration by removing the existing Wheeler filters and their three-part media, as well as the facility’s 10-in. poured-concrete underdrains, which were no longer efficient.

Scope

Colorado Clarification

Johnstown, Colo., is a rapidly growing community located between Denver and Fort Collins. With the town’s water treatment plant operating its circular clarifier systems at maximum capacity to meet summer peak demand rates, utility personnel began to explore options for expanding the plant to meet current and future demand requirements.

Scope

Attacking Algae

The city of Florence, Colo., Water Treatment Plant (WTP), located 75 miles south of Denver, uses blended surface water taken from the city’s southernmost water reservoir. All raw water sources entering the reservoirs flow into the northern reservoir and then into the southern reservoir to ensure that the water is thoroughly mixed before entering the pipeline to the plant. The source water, which comes primarily from snowmelt, is low in turbidity, alkalinity, minerals and color.

Acquiring the Taste

The Evitts Creek Water Treatment Plant—owned and operated by the city of Cumberland, Md.—is located just over the state border in Bedford, Pa. It provides potable water for Cumberland and surrounding communities in Maryland, West Virginia and Pennsylvania. The plant treats raw surface water taken from the Lake Gordon reservoir.

Scope

Freshening Up

Fresh Pond is a vital part of the drinking water supply system for the residents of the City of Cambridge, Mass. Fed by the 2.5-billion-gal Hobbs Brook Reservoir and the 255-million-gal Stoney Brook Reservoir via gravity, Fresh Pond provides a raw water source for the 24-mgd Cambridge Water Treatment Plant (WTP).

Scope

An Expanding Issue

In the last decade, the existing Freedom District Water Treatment Plant (WTP)—owned by the Carroll County, Md., Bureau of Utilities—had access to plenty of source water in the 3,100-acre Liberty Reservoir. But the service area’s steady growth squeezed the 3-mgd capacity of the water plant, with spikes in peak demand exceeding 70 percent of the plant’s capacity.

Scope

To address the potential shortfall, water conservation initiatives and limits on new building permits were put into play as the district began planning for an expansion project.

Milling About

NewPage operates eight paper mills in the United States. The Biron mill located in Wisconsin Rapids, Wis., produces approximately 370,000 tons of paper each year.

Bay Watch

The Little Patuxent Water Reclamation Plant (LPWRP) serves the heart of Howard County, Md. The sewage collection system recently underwent a $92 million upgrade to improve the quality of the plant’s effluent discharge and reduce the amount of harmful nutrients that reach Chesapeake Bay.

Project background

A Carolina Comparison

The Greenville Water System in Greenville, S.C., draws water from three sources—Table Rock Reservoir on the South Saluda River, Poinsett Reservoir on the North Saluda River and Lake Keowee. Table Rock and Poinsett Reservoirs are both located in the foothills of the Blue Ridge Mountains in northern Greenville County. The source waters from the mountain reservoirs were once so clear that they were unfiltered and only treated with chlorine for over 70 years.

Colorado City Tackles Turbidity Treatment

Dissolved Air Flotation (DAF) has been characterized as a clarification process that is limited to low-turbidity algae-laden waters. Pilot testing and actual plant operations at the 63rd Street Water Treatment Plant in Boulder, Colo., has proven that this is not the case.

Background

Addressing South Korean Water Issues in New Ways

The Korean Water Resources Corp. (K-Water) operates the Songjeon Water Treatment Plant in Wonju, South Korea. The plant obtains raw water from the Hoeng-Seong (HS) Lake. The lake water has algae blooms, high turbidity when rainfall events occur and the need for powdered activated carbon (PAC) to enhance organic removals and prevent chlorinated byproducts such as total trihalomethanes (TTHM), dichloroacetic and trichloroacetic acid (HAA2) and chloral hydrate (CH).

Preserving & Reusing

Hong Kong’s first tertiary WWTP protects a nature preserve at a tourist landmark

Background

The Ngong Ping Wastewater Treatment Plant (WWTP) treats and reuses the wastewater generated in the Ngong Ping tourist area in Hong Kong, China, situated in the watershed for the Shek Pik Reservoir. This area is considered environmentally sensitive due to the water supply catchment and the country parks surrounding the Lantau plateau.

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