Showing papers on "Enhanced biological phosphorus removal published in 1976"
TL;DR: Viruses seeded into a 50,000 gal day−1 three-stage activated sludge pilot plant were effectively reduced in the treatment process, and no direct relationship was evident between the numbers of coliphages and enteroviruses present in the primary effluent.
30 citations
TL;DR: In this paper, the effect of nitrogen limitation on metabolic activities of activated sludge has been studied by using a completely mixed continuous flow bench-scale unit, which was operated at various dilution rates with and without cellular recycle, and was maintained at a constant temperature 26 1°C and pH of 6.5.
Abstract: Study of the effect of nitrogen limitation on metabolic activities of activated sludge has been conducted by using a completely mixed continuous flow bench-scale activated sludge unit. The system was operated at various dilution rates with and without cellular recycle, and was maintained at a constant temperature 26—1°C and pH of 6.5. The results show that the concentration of nitrogen in the feed will significantly affect the contents of sludge phosphorus, sludge protein, and carbohydrate as well as the morphological configuration of sludge organisms. However, the results obtained from the system with cellular recycle show that the substrate utilization rate and sludge yield coefficient are independent of nitrogen concentration in the feed. The rate of oxygen utilization is higher in the nitrogen-rich activated sludge system than the nitrogen-deficient activated sludge system, but the endogenous respiration rate constant is identical in both systems.
4 citations
TL;DR: Results strongly suggest that initial removal of soluble phosphorus in a liquid stream, passing over a viable biological slime attached to a fixed surface, is primarily the result of a biochemical, rather than a physical adsorption, mechanism.
Abstract: Although much interest through the years has surrounded luxury uptake of phosphurus by activated sludge, critical attention has largely ignored this subject in favor of biological slimes of the type found in trickling filters. Relevant to the matter of phosphorus uptake by slimes is the question of the principal mechanism involved—physical or biochemical. A unique channel apparatus with provisions for exposure of the slime surface to UV radiation was constructed to study these questions. Results strongly suggest that initial removal of soluble phosphorus in a liquid stream, passing over a viable biological slime attached to a fixed surface, is primarily the result of a biochemical, rather than a physical adsorption, mechanism. No evidence was found that luxury uptake of phosphorus takes place by biological slimes under normal operating conditions.
3 citations