Showing papers on "Enhanced biological phosphorus removal published in 1996"
TL;DR: In this article, an anaerobic-anoxic (A2) sequencing batch reactor (SBR) coupled with a nitrification SBR was evaluated. And the technical feasibility for simultaneous phosphorus and nitrogen removal in the proposed two-sludge system was evaluated, and it was concluded that the separation of the nitrification step leads to an optimal process design for the application of denitrifying dephosphatation.
386 citations
TL;DR: The data provide an unequivocal demonstration of the involvement of glycogen in the biological phosphorus removal process and a biochemical model for the synthesis of polyhydroxyalkanoates from acetate and glycogen was elaborated in which the tricarboxylic acid cycle is proposed as an additional source of reduction equivalents.
181 citations
TL;DR: Results of substrate uptake suggested that the sludge preferred to utilize glucose instead of cellular glycogen as an energy source during acids uptake, suggesting that they could assimilate or possibly scavenge most of the dissolved substrate of the waste water and dominate in the deteriorated biological phosphorus removal processes.
162 citations
TL;DR: The results clearly showed that most part of the sink of carbon anaerobically taken up is explained by PHA (poly 3-hydroxyalkanoates), and that glycolysis is playing a significant role in the anaerobic uptake of acetate and propionate.
99 citations
ENEA1
TL;DR: In this article, a modified lab-scale nutrient removal activated sludge system (DEPHANOX) was used to find whether it can be technologically convenient to use the capability of poly-P bacteria of taking up phosphate under anoxic condition by utilizing nitrate as electron acceptor.
92 citations
TL;DR: An optimum pH 6.8±0.7 was proposed for anaerobic acetate metabolism, because that a relatively high AUR with less energy consumption can be maintained by the bacteria that respond for biological P removal.
90 citations
TL;DR: A preliminary metabolism model of denitrifying phosphorus removal bacteria was proposed, and found to be capable of adequately accounting for simultaneous phosphorus release and denitrification under anoxic conditions.
66 citations
TL;DR: In this article, the effect of oxygen on the activity of denitrifying phosphorus removing bacteria has been studied and it was concluded that oxygen has no detrimental effect on the dephosphatation activity.
64 citations
TL;DR: By simulating the conditions which may occur in practice, it was shown that potassium is an essential factor in biological phosphorus removal processes and the system achieved complete phosphorus removal when potassium was present in excess amounts.
62 citations
TL;DR: The possibility of joining biological phosphorus and nitrogen removal in a biofilm sequencing batch reactor was studied and optimal operation conditions were establish to obtain highest removal rates with a well established microbial community.
60 citations
TL;DR: PACT (Powdered activated activated carbon treatment) process was developed for the treatment of wastewater containing compounds which are difficult to oxidize as discussed by the authors, and it has been applied in lab plant for treatment of synthetic textile wastewater with an azodye used in the wool textile industry (Acid Orange 7, C.I. 15510).
TL;DR: In this paper, a greenhouse study was conducted to determine the number of microbial populations and activities in sewage sludge and phosphate fertilizer-amended dark red latosoil for cultivation of tomato plants.
TL;DR: In this article, the effect of organic loading and aeration time on EBPR recovery was investigated in a pilot-scale EBPR process and it was concluded that aeration should be carefully adjusted to the organic loading.
TL;DR: In this paper, a new nutrient removal system combining activated sludge with fixed biofilm was developed in a pilot-scale plant with different operating parameters (i.e., hydraulic retention time, return sludge ratio and mixed liquid recycle ratio) to evaluate its performance.
TL;DR: In this article, the performance of an SBR with nitrification, denitrification, carbon oxidation and phosphorus removal was evaluated using pre-settled domestic wastewater from Bennekom-Municipal Treatment Plant (The Netherlands).
TL;DR: Enhanced biological phosphorus removal (EBPR) has since 1992 been run as a full-scale UCT-process in a part of the waste water treatment plant in Helsingborg as discussed by the authors.
TL;DR: The acetate requirement for the sidestream process where P-removal in a stripper tank is applied is shown to be much lower than the requirements needed in a mainstream process.
TL;DR: The objective of this work was to demonstrate the feasibility and to quantify the maximum extent of enhanced biological phosphorus removal from a phosphorus-rich wastewater originating from a cheese factory and demonstrate without doubt that bio-P removal, and not just normal metabolic phosphorus accumulation, took place.
TL;DR: To better understand why activated sludge systems remove phosphate, different cell concentrations of Acinetobacter junii were used as inoculum in a mixed liquor medium containing sodium acetate.
TL;DR: This process employs 2 reactors connected in series, and is capable of controlling the duration of aerobic, anoxic and anaerobic conditions in both reactors by utilizing the ORP bending point, which corresponds to the termination of denitrification.
TL;DR: In this article, anaerobic digestion of excess sludge originating from enhanced biological phosphorus removal (EBPR) occurs, where a complete hydrolysis of polyphosphate occurs.
TL;DR: The phosphorus removal process was studied in a bench-scale plant for a period of 300 days and phosphorus removal occurred within a limited VFA uptake range.
TL;DR: In this paper, a pilot plant for enhanced biological phosphorus removal (EBPR), complemented by laboratory investigations of sludge samples from different large EBPR plants, was investigated with a waste activated sludge (WAS).
Abstract: Phosphate release and phosphate fixation during sludge treatment of waste activated sludge (WAS) was investigated with a pilot plant for enhanced biological phosphorus removal (EBPR), complemented by laboratory investigations of sludge samples from different large EBPR plants. The major part of the eliminated phosphorus in the pilot plant was due to the storage of polyphosphate (poly-P) in the WAS and was accompanied by an uptake of magnesium and potassium. Thickening and stabilizing WAS from the EBPR pilot plant results in a hydrolysis of poly-P which could be modeled with first-order kinetics and the Arrhenius relationship for the temperature dependence of the reaction constant. As a result of poly-P hydrolysis in stabilizing systems, phosphate, magnesium, and potassium are released, but only potassium remains in solution, whereas magnesium and a part of the released phosphate were precipitated as struvite. Another large fraction of the released phosphate was fixed by aluminium.
TL;DR: The best results regarding phosphate removal and nitrification were obtained when the mean organic load was 3 gCOD/m 2 ·d, and when the organic loading rate was higher than 5 gC OD/m2 ·d the activity of the phosphate accumulating bacteria andNitrification could not be observed.
TL;DR: In this article, three mechanisms for COD loss are suggested, based on results of COD balances for different types of activated sludge system, and model simulation results with and without the assumption of coder loss are discussed, as well as the influence of influent COD composition on predictions of volatile suspended solids concentration/production and oxygen consumption.
TL;DR: It has been shown that the supply of oxygen and recirculation of activated sludge to the denitrification tank can be controlled directly by a simple control routine using an on-line measurement of nitrate and ammonium in the aeration tank.
TL;DR: In this paper, an extended model based on the activated sludge model No. 1 was used to investigate the kinetics of nitrification in the case of phosphorus deficiency, the demand for phosphorus under dynamic conditions, as well as the effect of variations in the nitrogen load at low levels of phosphate.
TL;DR: In this paper, the overall role of the concentration of volatile fatty acids (VFA) in the influent wastewater on the EBPR process was investigated, and the effect of pH on phosphate release under anaerobic conditions was investigated.
TL;DR: In this article, the authors investigated the effects of three oxidants, namely, chlorine, ozone and hydrogen peroxide, on nutrient removal processes when used on a continuous basis for bulking control in a full scale biological nutrient removal activated sludge plant.