The mathematical model used for computing the composition and production of activated sludge is derived from the method of material balance. This model is a refinement of the earlier Chudoba–Tucek steady-state model, and it is applicable to single-sludge systems with or without
primary clarification. Solids composition and production are expressed explicitly as a function of solids retention time. The new model contains two variable parameters that are characteristic of the influent and can be easily determined using laboratory data. Applications to the sizing of
solids processing facilities and computation of the true food-to-microorganism ratio introduced by the author are illustrated.
Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year. Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.