Journal Article10.1002/CEAT.200600076
Effects of Operational Variables on Nitrogen Removal Performances and Its Control in a Pre‐Denitrification Plant
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TL;DR: In this article, the effects of six operational variables, i.e., dissolved oxygen (DO), nitrate recirculation flow, sludge recycle flow, waste wastage flow, external carbon dosage, and anoxic volume fraction, on the performance of nitrogen removal and its control in a pre-denitrification plant were studied.
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Abstract: The aim of this work is to study the effects of six operational variables, i.e., dissolved oxygen (DO), nitrate recirculation flow, sludge recycle flow, sludge wastage flow, external carbon dosage, and anoxic volume fraction, on the performance of nitrogen removal and its control in a pre-denitrification plant. The results obtained show that the six operational variables have a significant influence on nitrogen removal in such a system, while the utilization of the control strategies can improve the situation to a significant extent. The control of DO concentration should be correlated with the influent ammonia load, the effluent requirement and nitrification type. The anoxic effluent nitrate concentration should be controlled at ca. 2 mg/L or the ORP value at the end of the anoxic zone should be controlled at ca. -90 mV. The control of the sludge recycling flow by online monitoring of the sludge blanket height (SBH), is an alternative to the conventional control of the constant sludge recycle flow. It may be possible to achieve the automatic control of sludge wastage flow by online measuring of the ammonia concentration and the nitrification capacity of the sludge. The recirculation of nitrate and external carbon dosage should be simultaneously controlled to optimize nitrogen removal. The anoxic volume fraction should also be optimized, to ensure a good balance between nitrification and denitrification.
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Citations
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•Dissertation
Implementació d'eines avançades de control per a l'eliminació de nitrogen i optimització dels costos energètics a l'EDAR de la Vall del Ges
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References
Strategies for Optimized Nitrate Reduction with Primary Denitrification
TL;DR: In a situation in which advanced, process-stable primary denitrification has to be carried out in a restricted space, especially in large treatment plants, controlled nitrate recirculation oriented on the requirement for biodegradables is a feasible method.
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Adaptive control of external carbon flow rate in an activated sludge process
TL;DR: In this article, an adaptive carbon flow rate controller is applied to a pre-denitrifying pilot-scale plant to maintain a low nitrate concentration in the anoxic zone by controlling the external flow rate of the carbon source.
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Control of the aeration volume in an activated sludge process for nitrogen removal
Pär Samuelsson,Bengt Carlsson +1 more
TL;DR: An automatic control strategy for adjusting the aerated volume so that the effluent ammonium level can be kept close to a desired value despite major changes in the influent load is developed.
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An approach to controlling sludge age in the activated sludge process
Avni Cakici,M. Bayramoǧlu +1 more
TL;DR: In this article, a different approach to the control systems in the activated sludge wastewater treatment process is presented, based on the control of the sludge age and the microorganism concentration (MLSS) in the aerator, by adjusting sludge recycle and wastage flow rates, respectively.
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Nutrient sensor based real-time on-line process control of a wastewater treatment plant using recirculation
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.
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