In 2004, a team of researchers from Washington state’s King County Wastewater Treatment Division took on the task of cleaning up problems with the discharged screenings at their two treatment plants. The screenings were filled with excessive water, fecal and other organic matter.
Hawaii typically conjures up images of azure seas, swaying palms and pristine beaches. But behind the romance of this tropical paradise is a reality that faces many wastewater treatment professionals—a rising population that places increased demands on treatment facilities and tougher regulatory requirements.
On any given day, operators at the village of Addison’s South Wastewater Plant have no idea what’s coming down the pipeline. With a combined storm and sanitary sewer system, the 20-in. inlet can go from a trickle to raging-water full with just a few hours of rain.
“We always get bigger than usual equipment because we have to be ready for bigger flows. (The plant) can go from 1.5 to 20 million gal per day in a heartbeat,” said Doug Armstrong, the plant’s chief operator. “I always tell manufacturers: I need something that’s little but big.”
A few years ago, the Hammonton Wastewater Treatment Plant in Hammonton, N.J., faced constant problems with rags, trash and plastics passing through a rusty, old bar screen at the wastewater treatment plant and into the oxidation ditch and final clarifier.
With a rapidly growing population and three lagoons nearly at capacity, managers of the Star Sewer and Water District in Star, Idaho, needed to increase their treatment capacity. Additionally, local regulators were encouraging the facility to improve the quality of plant effluent.
The city decided it was time for a major expansion and hired Keller Associates, a consulting engineer firm in nearby Meridian, to explore various technologies. The design team decided to install membrane bioreactors (MBR) as the secondary treatment process.
The city of Merritt, British Columbia, Canada, was in need of an upgrade for the town’s wastewater treatment plant. Luckily the upgrade happened, and it not only fixed the plant’s original problems, but also led to a 75% reduction in routine maintenance time for screening equipment.
Managers of a 1.2 mgd (189 m3/h) wastewater treatment plant in Star, Idaho, have reported the successful installation of a solids separation and removal system that protects membranes in its new, state-of-the-art membrane bioreactor (MBR) addition.
The plant has also seen immediate maintenance benefits from the elimination of aerator plugging in its three lagoons.
Antarctica Research Station Adds Sewage Treatment Plant, Installs Innovative Sewage Grinders in Head
Even in Antarctica, one of the coldest, most barren corners of the Earth, there is a wastewater treatment plant that is processing sewage. In January, the McMurdo Station, America’s research facility on Antarctica, completed construction of a new 121,000 gpd plant and is quickly bringing the facility up to speed. This is the station’s first treatment plant.
The Wakefield-Calder Vale treatment plant of Yorkshire Water, has undergone major overhauls and in September 2002 the plant’s headworks was significantly upgraded with three Finescreen Monsters® to reduce the amount of solids entering the system.
Scottish Water, the U.K.’s fourth largest water treatment organization, recently installed three Bandscreen Monsters® at their Hawick treatment plant to handle inorganic solids found in wastewater and stormwater.
Keeping Santa Barbara clean is a tall order, and the folks at the City’s El Estero Wastewater Treatment Plant take the job very seriously. With a growing population and strict California discharge requirements, managing the 8.5 million gallons per day (MGD) average flow takes a lot of resourcefulness.
Early Spanish settlers described Ventura County as the “land of everlasting summers” and named this region located northwest of Los Angeles County, California, “San Buenaventura”, which means “good fortune”.
Installation of a new system that grinds, washes, compacts, and dewaters bar screenings at the Meriden(CT) Water Pollution Control Facility has reduced organic content and overall volume, eliminating remote landfill disposal costs, while also significantly reducing handling needs and odor, according to the plant's manager.