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A comparative pilot-scale study of the performance of conventional activated sludge and membrane bioreactors under limiting operating conditions
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ABSTRACT: The behavior of the conventional activated-sludge (CAS) process was compared to that of the membrane bioreactor (MBR) process under limiting operating conditions; that is, at a low solids retention time (SRT) and hydraulic residence time (HRT). The SRT was varied from 2 to 7 days, and the HRT ranged from 5 to 18 hours. The comparison was carried out in terms of nitrification and denitrification kinetics and in terms of the carbon and nitrogen removal performance of these processes. The study involved two pilot-scale units: a CAS unit with a 9-m3 aeration tank and a 225-L MBR. Both ...
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Long-term effect of total cycle time and aerobic/anoxic phase ratio on nitrogen removal in a sequencing batch reactor
; ...sequencing batch reactor was used to study nitrogen removal from a synthetic wastewater with an...the reactor operation. In terms of nitrogen removal efficiency, the set of 8 hours of...nitrate-nitrogen) and exhibited a percentage nitrogen removal rate of 77 +/- 2.5%. In terms of ...
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Immobilized Cell Augmented Activated Sludge Process for Enhanced Nitrogen Removal from Wastewater
; ...performances. In this study, enhanced nitrogen removal using ICAAS was investigated. Laboratory-sca...20% by volume gained 24 5% higher nitrogen removal than a control CMAS, which provided nitrogen removal of 28 7%. The ICAAS scheme is a viable...
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Maximum Nitrogen Removal in the Step-Feed Activated Sludge Process
; ...sludge process that result in maximum nitrogen removal. The model indicates that nitrogen removal efficiency in a step-feed activated...Modified Ludzack-Ettinger process for nitrogen removal, when the flow to each step is optimally...
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Optimization of the Intermittent Aeration in a Full-Scale Wastewater Treatment Plant Biological Reactor for Nitrogen Removal
; ...Celoni (Barcelona, Spain), where a nitrogen removal based on a nitrification-denitrification...number of similar systems, in which a nitrogen removal, based on a nitrification-denitrification...biological reactor, nitrification, nitrogen removal. Introduction Removal of nitrogen...
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Nitrogen removal in a partial nitrification/complete denitrification process
; ...denitrification (PN/CD) to achieve nitrogen removal equivalent to that obtained with the...required by the LE process for equivalent nitrogen removal. The benchscale PN/CD process was...denitrification, activated sludge, nitrogen removal, models. As the demand for water reuse...
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Investigation of Nitrification and Nitrogen Removal from Centrate in a Submerged Attached-Growth Bioreactor
; ...investigate the nitrification and nitrogen removal from centrate produced in the dewatering...with methanol). The average total nitrogen removal was 85%. Inhibition of nitrite oxidation...222 (2008). KEYWORDS: nitrification, nitrogen removal, recycle stream, side stream treatment...
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Characterization of denitrification and nitrification in a step-feed alternating anoxic-oxic sequencing batch reactor
; ...periods, resulting in an average total nitrogen removal efficiency up to approximately 90...step-feed, sequencing batch reactor, nitrogen removal, alkalinity. Introduction Biological...essential in process design for biological nitrogen removal systems. On the other hand, ...
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EPA to Help Reduce Patuxent Nitrogen Level
; ...to help the state pay for a major nitrogen removal project on the Patuxent River, Gov...represent the most cost-effective means of nitrogen removal. Since then, the state Department...justification can be made to pay for nitrogen removal," said Brooks Bowen, a special assistant...
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Plan to Fight Pollution at Blue Plains May Be Near After Two Years of Talks
; ...world's largest pilot program for nitrogen removal. "It would be the single most cost-effecti...population and sewage levels are growing. Nitrogen removal is a relatively low-technology process...Maryland plans to install advanced nitrogen removal at 52 plants at a cost of $250 ...
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Sequencing batch membrane reactor treatment: Nitrogen removal and membrane fouling evaluation
; ...chemical oxygen demand (COD) removal, nitrogen removal, and membrane permeability during...more than 98% COD removal occurred. Nitrogen removal efficiency ranged from 87 to 93% through...membrane reactor, membrane fouling, nitrogen removal, simultaneous ...
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