Secondary Clarifiers: The Mechanisms Behind the Myths
All biological wastewater treatment processes depend largely on the solids capture efficiency of their secondary clarifiers. Because solids escaping secondary…
Scenario-based Financial Planning: A New Tool for Utility Managers
The Goleta Sanitary District has developed a financial model of its operations that takes into account all important aspects of…
Saving the Chesapeake Bay — Planning for Less Than 3 mg/l Total N and 0.1 mg/l Total P — the Lynchburg Regional WWTP Story
This paper describes work carried out to evaluate alternatives to allow enhanced nutrient removal at the Lynchburg Regional WWTP, to…
Risk-Based Model/Decision Support Tool for Wastewater Asset Refurbishment and Replacement (R&R) Planning
Utility best management practice, as embodied in asset management terms, is delivering to customers defined levels of service at an…
Recent Improvements to Trench-Type, Self-Cleaning Wet Wells
In trench-type wet wells, pump intakes are in a deep, narrow trench, below and in line with the influent conduit….
Quantification of Dentrification Potential in Carbonaceous Trickling Filters
Biofilm samples from a carbonaceous trickling filter were evaluated in bench scale reactors to determine their maximum potential dentrification rates….
Planning and Funding Asset Replacement: One Agencies Experience
This paper will be of interest to any agency concerned with sound asset management and maintaining the quality and viability…
Pumping Station Modifications to Comply with Ansi/HI 9.8 Improve Performance While Lessening O&M Requirements — Two Case Studies.
Oversized wet wells in wastewater pumping stations lead to the accumulation of grit, sludge and floatable materials. Trench-type wet wells…
Pima County, Wastewater Management, Northwest Outfall Interceptor Emergency Rehabilitation Project
On September 7, 2002 two sinkholes opened on a busy arterial street in Tucson, Arizona. As a result of the…
Passive System Treats Industrial Stormwater for Class Vinjection Criteria
EPA has begun to more closely regulate Class V stormwater injection wells under the UIC permitting program. In cases where…
Operations and Maintenance Requirement of Vortex with Disinfection and Screening with Disinfection CS
Technologies such as screening, vortex and high-rate disinfection are successfully operating to meet CSO requirements at satellite locations through the…
Optimizing Nitrogen Removal in an MBR Under Abnormal Operating Conditions.
During startup and commissioning of a modified Ludzack-Ettinger (MLE) membrane bioreactor (MBR), Pima County Wastewater Management Division (PCWMD) staff were…