Case Studies

Michigan Facility Achieves Phosphorus Removal Goals

The Cass County, Mich., Lakes Area Sewer Authority (LASA) wastewater treatment plant is meeting its phosphorus removal needs by utilizing Schreiber’s Continuously Sequencing Reactor (CSR) biological process technology combined with the company’s compressible media filter, the Fuzzy Filter, for tertiary filtration.

Meeting Higher Standards

The Aquia Wastewater Treatment Facility (WWTF), located in Stafford County, Va., was originally built in 1980. In 1990, it underwent a major upgrade and expansion to its biological treatment system that included the installation of new 4.2-mgd countercurrent aeration basins, followed by a secondary clarifier, and a pump station for return activated sludge (RAS), nitrified recycle (NR) and waste activated sludge (WAS).

Protecting Carbon Columns

A chemical plant located in the southeast produces insecticide, herbicide and fungicide products packaged under various labels for major chemical companies. These products are marketed for sale in the U.S. and overseas. Due to the toxicity of these types of chemicals, the plant captures and treats all storm water that has the potential to contact any of the production areas where these chemicals are produced. These measures are required because some of these compounds can be toxic at part per trillion levels.

Energy-Efficient Digesters Help Offset Power Cost Increases

Plant A, a water reclamation plant, had experienced an 85% increase in its power rates and began evaluating the energy efficiency of every piece of equipment in its facility.

Fortunately, the plant operates in a very energy-efficient manner. In 2006, the city built and started up a new water reclamation plant, replacing a 40-year-old two-phased trickling filter facility. The process configuration of the new plant consists of two countercurrent aeration reactors, two rapid-removal helical scraper clarifiers and two countercurrent aeration digesters, all supplied by Schreiber.

Pennsylvania Power Plant Installs New Filters

Homer City Power Generation is a three-unit, coal-fired power plant producing 1.884 MW of power and capable of sustaining 2 million households. The facility is owned by Edison International and operated by its subsidiary, Midwest Generation. The 40-year-old plant is located in Indiana County in Western Pennsylvania and incorporates the tallest smokestack in the United States (1217 feet).