Abstract: Oxygen transfer is an important part of wastewater treatment and accounts for as much as 60% of energy consumption in the activated sludge process. Prior to 1984, no standard method for quantifying oxygen transfer existed, ...

Abstract: Recent advances in estimating mass transfer coefficients are largely restricted to clean water conditions, and engineers must still rely upon empirical methods such as α factors to correct results for process conditions. ...

Abstract: A predictive model for storm-water runoff was implemented on a GIS platform based on the unit area loading method and Browne’s empirical relation for soil characteristics for the Upper Ballona Creek Watershed in Los Angeles. ...

Abstract: Runoff from 15 watersheds in the San Francisco Bay area are sampled over a 2‐yr period and analyzed for hydrocarbons. Both gravimetric analyses and high‐resolution gas capillary chromatography are performed. It is found ...

Abstract: The high purity oxygen activated sludge process requires more advanced controls as compared to the conventional activated sludge process. Feedback controllers have difficulty controlling process disturbances due to process ...

Abstract: Knowledge‐based system technology has recently been introduced in activated sludge plant operations. A knowledge‐based expert system (KBES) called ASPX (Activated Sludge Process Expert) is developed for nitrification process ...

Abstract: Powdered activated carbon (PAC) has been added to activated sludge processes over the past 10 years to improve process performance in a variety of ways, including ammonia removal. Improved ammonia removal is a surprising ...

Abstract: Although street sweeping is commonly regarded as a cost-effective storm-water best management practice, there is little quantitative evidence that street sweeping directly improves runoff water quality. In this paper, ...

Abstract: An event mean concentration (EMC), usually collected with an automatic, flow-weighted composite sampler, is often used to characterize stormwater pollutants. Automatic samplers are not recommended for collecting oil and ...

Abstract: A dynamic mathematical model for the high purity oxygen activated sludge process, which incorporates structured biomass, gas–liquid interactions and control systems, was developed. The model was calibrated using pilot plant ...