Sturbridge, Mass., has historically suffered from periodic blooms of filamentous bacteria that have caused bulking in the secondary clarifiers of their three activated sludge package plants. The elevated clarifier solids loadings during high flow events have often caused excessive backwash cycle times of their sand filter, and occasional diversion of excess flow to a neighboring publicly owned treatment works.
Founded in 1989, the Long Trail Brewing Co. quickly outgrew the capacity of its basement location at a Bridgewater Woolen Mill along the Ottauquechee River in the Green Mountains of Vermont. In 1995, the brewery relocated to a larger facility nearby with a wastewater treatment plant designed to treat high strength wastewater with a BOD5 concentration of approximately 10,000 mg/L.
A medical device manufacturer in the United States wanted to expand production capacity without exceeding discharge limits that could result in crippling financial penalties. A city mandate of 10% reduction in water consumption for industrial users challenged the plant’s desire to expand, as water discharged from its operations was already rapidly approaching discharge limits. Additionally, it wished to drastically reduce its raw water requirements and waste disposal cost of operation.
The Duckwall Pooley Fruit Co. is one of the largest fruit packagers in the Hood River Valley in Oregon, packing approximately 1.8 million bushels of pears annually. To improve its operations and lower its costs, the company implemented new measures to optimize the rinse water usage in the pear packaging line. After packaging the fruit, collected water is chlorinated for disinfection and treated with coconut shell based activated carbon for residual chlorine removal.
Facing aging infrastructure and more stringent drinking water regulations, the city of Pauls Valley, Okla. undertook a rigorous pilot testing program to establish design parameters for a new water treatment plant which would achieve compliance for turbidity, pathogen and organic removal.
The Concord Department of Public Works serves the needs of approximately 16,000 residents and local businesses. Prior to 2007, the town of Concord, Mass., operated under a National Pollutant Discharge Elimination System (NPDES) permit that allowed an interim seasonal phosphorus limit of 0.75 mg/L. But after the Massachusetts Department of Environmental Protection and the U.S.
A U.S. medical device manufacturer wanted to expand production capacity without exceeding discharge limits that could result in crippling financial penalties. It also wanted to drastically reduce raw water requirements and waste disposal costs. The plant was producing a 375-gal-per-minute (gpm) waste stream containing organic and inorganic manufacturing byproducts.
The town of Grand Junction, Iowa, uses a groundwater source to provide water to 850 people. The water quality from a 365-ft-deep well is generally good, with iron concentrations of about 0.3 mg/L and hardness of about 273 mg/L. In the early 1930s, the town installed a vertical pressure filtration system with a softener to treat the water. The filter media, however, eventually became completely clogged and stopped operating properly. Water quality became poor, and there were issues with maintenance of the distribution system.
The city of Elkton, Md., located near the head of the Chesapeake Bay, was recently required to meet new stringent wastewater effluent discharge regulations to protect aquatic life in the bay. The city’s wastewater treatment plant was using fine bubble air diffusers, which did not provide consistent nitrification and sufficient denitrification to meet the new requirements.
Dutch wastewater plant cuts biosolids production and generates phosphates for reuse
A new treatment system increased water production while keeping village under budget
Water treatment plant continues to produce high-quality water for residents