James Welp, William Fernandes, William Angoli, Biju George, Michael Heitz, and James Rowan
New approaches to solids processing
Restrictions on land application, increased transportation costs, and concerns about greenhouse gas emissions have sparked wastewater utilities’ interest in alternative solids processing technologies. At the same time, incineration facilities have become more fuel-efficient and environmentally
friendly. But can incinerators be considered “green” alternatives for solids processing? The answer is yes. Read full article (login required)
One Mile Under
Ben Attai, Omar Moghaddam, Mike Bruno, and Jean Young
Los Angeles breaks new ground with deep-well biosolids injection project
Seeking an alternative to land application, the City of Los Angeles is evaluating the viability of injecting biosolids deep into the ground, the first project of its kind in the United States. Surmounting regulatory and environmental issues, public skepticism, and doubts from some of the city’s own management, the city secured permits for a 5-year demonstration project at the Terminal Island Treatment Plant. Construction began in June 2007, and operation is
expected to commence in May. If this project proves successful, other wastewater agencies will have an alternative way to manage their biosolids. Read full article (login required)
Talk to Me
Joseph L. Fiegl
Realizing the pitfalls of operating ‘out of sight, out of mind,’ a New York utility raises its profile through a comprehensive public communications program
In the view of many Erie County, N.Y., residents, the Great Lakes are one of the state’s great assets. But until recently, most were unaware of one wastewater service provider — the Department of Environment and Planning Division of Water Quality Management (DWQM) — that helps protect this national
treasure. In fact, many county residents were uninformed about the wastewater services and benefits provided by DWQM, which is why the division recently launched a formal public outreach program. The ultimate goal of the program is disseminate DWQM’s message so the residents grasp what their wastewater bill funds;, recognize, understand, and appreciate the services they receive; and comprehend how proper wastewater collection, conveyance, and treatment affects the quality of their lives and the environment. Read full article (login required)
Operations Forum Features
No Space? No Problem!
Rony Joel, Bruce Weinstein, Jeff Poteet, Solomon J. Abel, Stefan Haecker, and Jenn Watt
Florida plant expands its capacity while maintaining its footprint
What do you do when a growing community is replacing aging septic systems with new, centralized wastewater infrastructure, but space constraints at the existing treatment plant limit expansion? Marco Island, Fla., replaced its contact stabilization process with modified Ludzack–Ettinger
(MLE) and membrane bioreactor (MBR) processes. The upgrades not only increase treatment capacity from 3.5 to about 5.0 mgd (13,200 to 18,900 m³/d) but also provide high-quality reuse water suitable for irrigating condominium landscapes and golf courses. Read full article (login required)
Bruce Munn, Randy Ott, Nicholas Hatala, and Gerald Hook
Lessons learned from startup of the largest tertiary ballasted settling system in the United States
In spring 2005, construction of a major upgrade was completed to the Metropolitan Syracuse (N.Y.) Wastewater Treatment Plant (Metro) which included a 130-mgd (492,000-m³/d) peak-flow tertiary ballasted settling system for high-rate phosphorus removal. Following the completion of a
successful 30-day performance test period, effluent total phosphorus (TP) concentrations began to increase above effluent permit requirements.
The settling system was designed to reduce TP concentration in the biological aerated filter effluent from 0.75 mg/L to 0.12 mg/L. This performance was to be achieved at a ferric chloride dosage not to exceed 25 mg/L (as FeCl3) and an active polymer dosage not to exceed 0.6 mg/L.
When the TP concentrations began increasing, the project team immediately began seeking answers to ensure that the process could continue to perform up to its design capabilities. Read full article (login required)
UV Disinfection for a Real-Word Effluent
Calvin Youngberg and Kathryne Marko
Making sure UV will work for you
After the City of Longmont, Colo., installed a new ultraviolet (UV) disinfection system at its recently expanded wastewater treatment plant in 2002, the system was unable to meet the disinfection levels required by the discharge permit. Several
factors were identified that contributed to the performance problems, including an inadequately sized system, project specifications that did not reflect actual conditions, and variations in effluent quality that were larger than originally thought.
The city decided to find a replacement UV system, but in order to be sure that the replacement would be sized properly and be able to meet permit limits, the city decided to complete its own study. The tests performed addressed several of the city’s concerns about UV disinfection, including the daily variability of UV transmittance in the wastewater plant effluent, possible UV inhibition in the wastewater, the effect of suspended solids and particle size on UV effectiveness, and the actual dose–response curves for the effluent. Read full article (login required)