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.
Special Section: The Clean Water Act at 40
This special section reflects on the regulatory, technological, and financial advances spurred by the Clean Water Act as well as looks forward to what’s next for water quality and the sector.
Estimating nitrification capacity simply
To properly design, upgrade, or operate an activated sludge wastewater treatment plant (WWTP), designers or operators must understand its nitrification capacity.
For operators in particular, such an understanding is critical for optimizing a plant’s processes and achieving its maximum potential capacity.
Although maximum specific nitrifier growth rates are the key parameter for estimating WWTP nitrification capacity, various studies have reported a wide range of growth rates.
Creating an H2O economy
More citites see water in their future
The fashion-conscious crowd assembles every season along the runways in New York and Milan. Coffee drinkers have Brazil to thank for their morning latte, and investors look to Silicon Valley when they want to know what’s next in computing.
If Milwaukee and Cincinnati have their way, they, too, will soon have international reputations as industry leaders — only they will be the go-to experts for something slightly more ubiquitous: water.
Coming in the next issue:
Corroded crowns, eroded joints, cracked walls, leaky covers, and illegal connections are just some of the nightmares that keep collection system operators awake at night – sometimes literally, when dealing with emergency calls. But, by combining good planning, the proper products and technologies, and safe practices into rehabilitation and replacement plans, everyone can rest a little more soundly that the collection system will keep flowing freely.
Find out how an emergency repair on a tunnel that conveys an average of 4.7 million L/d (1.25 million gal/d) helped the utility not only stabilize a portion of the tunnel, but also conduct a small-scale test for a full rehabilitation project. Also, learn about the challenges of replacing and rehabilitating asbestos-containing pipe, and how pipe-bursting is emerging in some states as an affordable and permitted option. And, get a refresher course on the safety concerns for working on collection systems whether underground or not.
What used to require site visits and manual operation now can be monitored, measured, controlled, and resolved literally from the palm of one’s hand. But getting these new abilities requires putting in new efforts.
For example, a California utility installed the best available instrumentation — online, total suspended solids analyzers and solids retention time control software — to automate its activated sludge flow in real-time. But to get to that point, the study team had to test various types of equipment, troubleshoot problems, and create maintenance and check systems to ensure proper operation.
In another case, a Florida utility sought out how to remotely monitor and control its lift stations. The project would prolong the life of existing equipment and operate pumps more efficiently, but it raised the question of whether to create the network wirelessly or to trench in hardwires. Making that decision required learning about radio systems, choosing the right technology, understanding communications protocols and drivers, and considering cyber security.
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