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.
Reusing wastewater with papermaking quality in mind
A paper mill in the southwestern United States was considering expanding its production, which would double its freshwater requirements, as well as wastewater production. The mill had been treating its wastewater with a cloth disc filter to reduce the total suspended solids loading to the lift station of the local municipal water resource recovery facility. While considering several treatment options, the mill hired a consultant to look into reusing the wastewater to minimize discharge fees and the need for additional fresh water. The quality of the treated wastewater, however, had to meet the special requirements of paper manufacturing.
The right fit for granular medium filtration
Proper selection of granular medium filter properties is of crucial importance in meeting turbidity and disinfection requirements efficiently and cost-effectively. Optimized design of granular medium filtration systems results in significant capital and operational savings, while achieving the desired effluent quality. Filtration design criteria (e.g., granular medium depth, effective size, single or dual media, and filtration rate) are optimized utilizing a granular medium depth filtration model and results obtained from pilot studies or similar plants.
Wiser the second time around
Utilities draw on lessons learned, improved emergency plans to better respond to new challenges.
Coming in the next issue:
Putting water quality in the green
Green infrastructure has become one of those buzzwords that run the risk of becoming overused. However, when applied appropriately, green technologies and approaches can reap greater public health and water quality benefits than traditional control measures alone.
For example, the City of Lancaster, Pa., is integrating the use of green infrastructure with its core public works practices for its long-term control plan to reduce the frequency and volume of combined sewer overflows and address its stormwater discharges.
Likewise, Sanitation District No. 1 of Northern Kentucky is using a constructed wetland (pictured on the cover) to move the water quality needle in the right direction. The district’s 4.9-ha (12-ac) pilot project diverts water from Banklick Creek, treats the water using natural processes, and then returns the flow to the creek.
Also in this issue
- How low can you go? A South Florida facility examines several phosphorus and nitrogen removal alternatives for potable water reuse.
- Fiscal choices. Using the right economic analyses can help overcome the biggest barrier to biogas use.
- From bother to benefit. Extractive nutrient recovery emerges as a green option for managing phosphorus in sidestreams.
- Measuring microconstituents in treated biosolids. In a Canadian field study, a government-directed team tested the efficacy of seven biosolids treatment methods by measuring pharmaceutical and fragrance compounds.