Abstract: A mathematical model was developed for the biological‐nitrification process. The model assumed two consecutive oxidation steps occurring under a substrate‐inhibiting condition. The mathematical model was calibrated using ...

Abstract: Comprehensive models of wastewater treatment systems are evolving and offer potential as tools for aiding engineers in developing cost‐effective designs. These tools can be used for examining tradeoffs among unit processes, ...

Abstract: The use of a rule‐based approximate reasoning modeling technique is illustrated in the context of wastewater treatment plant design. Sludge bulking is a poorly understood problem in activated sludge wastewater treatment ...

Abstract: One important problem with using mathematical optimization models for design of wastewater treatment systems is that parameter values, and thus, model results, are often uncertain. A general approach, called robust optimal ...

Abstract: Biological‐nitrification experiments using chemostats were performed with three different nitrogenous substrates: ammonia, nitrate, and various mixtures of ammonia and nitrite. The study focused on the interrelationship ...

Abstract: A general approach, called robust optimal design, is developed in a companion paper and applied here to a comprehensive, nonlinear, activated sludge treatment system. The treatment system robustness is related to the ...

Abstract: An equilibrium model was developed to study the physical and chemical aspects of anaerobic fixed-bed biofilm reactors. Development of the equilibrium model was based on the fact that the total carbon dioxide production ...

Abstract: Although mathematical programming techniques can be applied to solve certain (type A) problems, they cannot be used to solve complex (type B) problems directly. Instead they can be used to generate alternative solutions ...

Abstract: An expanded‐bed anaerobic biological GAC reactor was connected to a GAC adsorber to form a hybrid reactor design for the treatment of inhibitory wastes that separates biological transformation from physical removal mechanisms. ...