Long-term Odor and VOC Performance Tests on Biofilters
This paper presents results and observations from a long-term pilot test of bulk media biofilters to assess their reduction of…
Development of a Document Management System for Plant Drawings
This paper discusses a document management system developed for the City of Medford, Oregon, Water Quality Control Plant. The computerized…
The Effects of Wastewater Characteristics on Metals Partitioning in Activated Sludge Mixed Liquor
Batch experiments were performed using mixed liquors from an activated sludge process receiving mainly residential wastewater and another activated sludge…
Low SRT Anaerobic Selector Pilot Plant Operation for SVI Control
A 75.6 liter per minute (lpm, 20 gallons per minute) anaerobic selector pilot plant was operated at the King County…
Using Simulations to Enhance Process Understanding
This paper discusses the use of simulations for training wastewater treatment plant operators. The simulations combine common laboratory tests with…
Al West Meets W. Edwards Deming: A Statistical Approach to the Control of the Activated Sludge Process
Shewhart control charts are used extensively in manufacturing to statistically monitor product quality, a key element in the total quality…
Should You Be Partnering?
Partnering on public works projects involving owners, construction contractors, and engineering firms is beginning to occur more often. The American…
Chemical Modeling to Solve Struvite Scaling Problems at the Sacramento Regional Wastewater Treatment Plant: A Progress Report
The precipitation of struvite (MgNH4PO4.6H2O) is a recurring problem in anaerobic sludge digestion systems. Soluble magnesium, ammonia, and phosphorus (P)…
Two Feet Per Second Ain’t Even Close
Wastewater velocities required to eliminate deposits in large sewers are greater than typically recognized. Work in recent years has centered…
WERF: A Field Scale Evaluation of the Airstripping of Volatile Organic Compounds by Mechanical Aerators
The stripping of volatile organic compounds (VOCs) by surface aerators was evaluated in experiments performed at field scale. Each experiment…
Process Modeling of Biological Excess Phosphorus Removal: A Basis for Detailed Design
Computer simulation of activated sludge systems can be an invaluable tool for the design and optimization of single sludge biological…
Evaluating Activated Sludge Secondary Clarifier Performance Using the CRTC Protocol: Four Case Studies
The American Society of Civil Engineers Clarifier Research Technical Committee (CRTC) has developed a protocol for evaluating activated sludge secondary…