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.
Out of Nose, Out of Mind
Odor control was a major concern when building the award-winning, state-of-the-art Pine Creek Wastewater Treatment Plant. The new 100,000-m3/d biological nutrient removal plant, which serves the southern areas of Calgary, Alberta, is located in the Bow River Valley near new residential developments and a golf course — plus, the site has ultimate capacity to treat 700,000 m3/d. Therefore, the City of Calgary made commitments to the residents of surrounding areas to incorporate odor control within the plant and adopted stringent odor-emission standards.
Minor Changes, Major Improvements
When Bozeman, Mont., received its new Montana Pollutant Discharge Elimination System permit in 2008, the city found it had a new total nitrogen limit. Wastewater treatment plant effluent now had to contain less than 355 kg/d (782 lb/d) of total nitrogen, while the effluent ammonia limit was still 1.52 mg/L (30-day average) and 3.15 mg/L (daily maximum). So, plant staff had to figure out how to get the existing activated sludge system to cut effluent total nitrogen without sacrificing ammonia removal.
A New Standard To Bear?
U.S. EPA’s plans to revise wastewater discharge standards for coal-fired power plants could mean stricter selenium discharge limits
Coming in the next issue:
Aiming for Smaller Targets. A recent feasibility study shows that contrary to conventional wisdom, combined heat and power systems can provide operational and financial benefits for plants smaller than 38,000 m3/d (10 mgd).
The Triple Bottom Line for Wine. In Sonoma, Calif., water and wastewater agencies used a triple-bottom-line approach to consider the financial, social, and environmental benefits of using recycled water as an alternative source for vineyard irrigation.
An Approach to the Limit. To meet effluent phosphorus limits approaching the limits of technology, designers of the Spokane, Wash., County Regional Water Reclamation Facility had to balance the inputs and outputs for each process to create any effective membrane treatment system.
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