Water Environment & Technology (WE&T) is the premier magazine for the water quality field. WE&T provides information on what professionals demand: cutting-edge technologies, innovative solutions, operations and maintenance, regulatory and legislative impacts, and professional development.
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Denitrification Takes a BAF
The Water Pollution Control Plant in Cheshire, Conn., was facing significant expenditures to purchase nitrogen removal credits under Connecticut’s nitrogen credit trading program. After evaluating various approaches to nitrogen removal, the town selected the separate-stage
biological anoxic filter (BAF) process with methanol feed. This installation, the first in Connecticut and the second in the New England region, is also the first application to add a separate denitrifying BAF to an existing nitrifying plant in the United States.
The Rock Box
Large quantities of grit, silt, rock, and other debris from an inceptor sewer that collects flow from both separate and combined sewer systems overwhelmed the headworks and grit removal processes at a large wastewater treatment plant. To correct the problem, the utility that operates the plant worked with consultants to evaluate available in-line and off-line technologies. When nothing they saw seemed to
be a good fit, they devised their own solution: the Rock Box.
New Water Supply Makes Its Way to Tap in Southern California
Reclaimed wastewater is giving 2.5 million Orange County, Calif., residents a new, reliable, locally controlled, droughtproof source of drinking water. After 4 years of construction, the Groundwater Replenishment System — the world’s largest advanced water purification plant of its kind —
began taking secondary treated effluent in January from the Orange County Sanitation District and putting it through a state-of-the-art three-step purification process that includes microfiltration, reverse osmosis, and ultraviolet light with hydrogen peroxide.
Coming in the next issue:
The Power of Digester Gas. As this California utility demonstrates, biogas-derived electricity can reduce our dependence on foreign fuel supplies.
• The Future Looks Bright. Ultraviolet irradiation systems are rapidly gaining traction in the water treatment, wastewater treatment, and water reuse markets.
• Advanced Treatment to Remove Microconstituents. Studies indicate several technologies show potential to remove endocrine disrupting compounds and pharmaceutical and personal care products.
• Collaborate to Educate. Involving all staff in startup and training led to the successful launch of a new anaerobic digester system in Brooklyn, N.Y.
• Rooting Out SSOs. Pilot-scale tests evaluate how well mechanical and chemical processes remove roots from laterals.
• Operational ‘Cents.’ O&M managers must consider all costs during the development stages of SSO and CSO long-term control plans.