Influence of dissolved oxygen and oxidation-reduction potential on phosphate release and uptake by activated sludge from sewage plants with enhanced biological phosphorus removal

Schön, G.; Geywitz, Susanne; Mertens, Frank

doi:10.1016/0043-1354(93)90033-e

Cited by 25 publications

(10 citation statements)

References 4 publications

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“…When nitrate is used as an electron acceptor in the uptake of Pi, a more efficient use is made of the available organic carbon, which is often rate-limiting in conventional treatment systems for nitrogen and phosphorus removal (Kuba et al, 1995). The presence of two bacterial populations capable of accumulating poly-P, one with oxygen as a terminal electron acceptor and one that also can use nitrate as electron acceptor, can elegantly explain why in some sludges phosphorus release is reduced under anaerobic (nonaerated) conditions by nitrate (SchOn et al, 1993).…”

Section: The Process and The Effect Of Nitratementioning

confidence: 98%

Ecological Aspects of Biological Phosphorus Removal in Activated Sludge Systems

Kortstee

Appeldoorn

Bonting

et al. 2000

Advances in Microbial Ecology

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Section: The Process and The Effect Of Nitratementioning

confidence: 98%

Ecological Aspects of Biological Phosphorus Removal in Activated Sludge Systems

Kortstee

Appeldoorn

Bonting

et al. 2000

Advances in Microbial Ecology

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“…Literature indicates that most ORP control research has been conducted only at lab-or pilot-scale (Bertanza, 1997;Charpentier and Florentz, 1987;Heduit and Thevenot, 1989;Koch and Oldham, 1984;Peddie et al, 1990;Schon and Geywitz, 1993;Zhao, 1998). Most of this research has concentrated on the simultaneous nitrification-denitrification process.…”

Section: Introductionmentioning

confidence: 99%

Oxidation–Reduction Potential Changes in Aeration Tanks and Microprofiles of Activated Sludge Floc in Medium‐ and Low‐Strength Wastewaters

Li¹,

Bishop²

2004

Water Environment Research

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Real-time control of aeration tank operation is key to highefficiency pollutant removal and energy savings. One of the aims of this study was to examine the potential for using redox potential (oxidation-reduction potential [ORP]) to indicate wastewater quality online in aeration tanks treating medium (chemical oxygen demand [COD] of 70 to 150 mg/L) and low (COD of 15 to 30 mg/L) pollutant-concentration wastewaters. The fieldscale data provide a good relationship between ORP values and nutrient removal along the length of the aeration tanks. The ORP values increased dramatically as organic matter was removed along the aeration tanks, indicating the improvement of the bulk liquor redox status. Dissolved oxygen higher than 1.0 mg/L was necessary for good biodegradation and improvement of the liquid redox status. Nitrification occurred at higher ORP values (380 to 420 mV) than was the case for organic substrate oxidation (250 to 300 mV). The microprofiles obtained from microelectrode measurements substantiate the heterogeneity of the microbial processes inside activated sludge flocs. Because of microbial oxygen utilization, the aerobic region in the activated sludge floc was limited to the top layer (0.1 to 0.2 mm) of the activated sludge aggregate present in medium-strength wastewater, with an anoxic zone dominating inside the flocs. When dissolved oxygen in the bulk water was higher than 4.0 mg/L, the anoxic zone inside the floc disappeared. At low wastewater pollutant concentrations, the ORP and dissolved oxygen inside the activated sludge aggregates were higher than those from medium-strength wastewater. The prospect of using ORP as an online control approach for aeration tank operation and the potential reasons for activated sludge floc size varying with pollutant strengths are also discussed. Water Environ. Res., 76, 394 (2004).

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“…0.05), the difference in P content between the sludge taken from the anaerobic zone and aerobic zone of the reverse A 2 /O system was higher than that of A 2 /O system (p ¼ 0.037). This may be attributed to the lower ORP in the anaerobic chamber of the reverse A 2 /O system that can result in more PO 3À 4 -P release (Schön et al, 1993). While the P content per cell dry weight in the EBPR process can be higher (e.g., 12%) (Hauduc et al, 2013), an average sludge P content of 6% indicated the growth and enrichment of PAOs in the activated sludge for the A 2 /O and reverse A 2 /O systems because P content in regular activated sludge is between 1 and 3% .…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Anaerobic/Anoxic/Oxic (A²/O) and Reverse A²/O Processes in Biological Nutrient Removal

Bernards

2014

Water Environment Research

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A performance comparison between the conventional anaerobic/anoxic/oxic (A 2 /O) process and the anoxic/anaerobic/oxic (reverse A 2 /O) process was conducted in lab-scale at the hydraulic retention time of 0.75 d and solids retention time of 10 d for more than 200 days. Both processes demonstrated excellent removal efficiency for organic matter (. 96%) and total nitrogen (. 85%), with no significant difference in microbial activities, sludge phosphorus (P) content, sludge settling property, and nitrifying community (dominated by Nitrosomonas and Nitrospira). However, there was significant difference in P removal, with the total P removal efficiencies in the reverse A 2 /O and A 2 /O systems of 76 6 6% and 70 6 6%, respectively. Placing an anoxic stage before the anaerobic stage in the reverse A 2 /O process resulted in a lower oxidation-reduction potential (ORP ¼À 268 6 45 mV) of the anaerobic zone, which contributed to higher P uptake by bacteria under subsequent aerobic respiration. Water Environ. Res., 86, 2186Res., 86, (2014.

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Influence of dissolved oxygen and oxidation-reduction potential on phosphate release and uptake by activated sludge from sewage plants with enhanced biological phosphorus removal

Cited by 25 publications

References 4 publications

Ecological Aspects of Biological Phosphorus Removal in Activated Sludge Systems

Ecological Aspects of Biological Phosphorus Removal in Activated Sludge Systems

Oxidation–Reduction Potential Changes in Aeration Tanks and Microprofiles of Activated Sludge Floc in Medium‐ and Low‐Strength Wastewaters

Evaluation of Anaerobic/Anoxic/Oxic (A²/O) and Reverse A²/O Processes in Biological Nutrient Removal

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Influence of dissolved oxygen and oxidation-reduction potential on phosphate release and uptake by activated sludge from sewage plants with enhanced biological phosphorus removal

Cited by 25 publications

References 4 publications

Ecological Aspects of Biological Phosphorus Removal in Activated Sludge Systems

Ecological Aspects of Biological Phosphorus Removal in Activated Sludge Systems

Oxidation–Reduction Potential Changes in Aeration Tanks and Microprofiles of Activated Sludge Floc in Medium‐ and Low‐Strength Wastewaters

Evaluation of Anaerobic/Anoxic/Oxic (A2/O) and Reverse A2/O Processes in Biological Nutrient Removal

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Evaluation of Anaerobic/Anoxic/Oxic (A²/O) and Reverse A²/O Processes in Biological Nutrient Removal