Simultaneous nitrification-denitrification process in extended aeration plants: pilot and real scale experiences

Bertanza, Giorgio

doi:10.2166/wst.1997.0243

Cited by 41 publications

(37 citation statements)

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“…Simultaneous nitrification and denitrification (SND) potentially offers a solution to the first problem as it prevents accumulation of NO mass transfer limitation of oxygen (Bertanza, 1997;Fuerhacker et al, 2000;Keller et al, 1997;Munch et al, 1996). The NO À x formed in the outer aerobic layer of the aggregates due to nitrification can be reduced in the central anoxic zone.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous nitrification, denitrification, and phosphorus removal from nutrient‐rich industrial wastewater using granular sludge

Yılmaz

Lemaire

Keller

et al. 2007

Biotech & Bioengineering

232

108

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The biological removal of nitrogen and phosphorus from nutrient-rich abattoir wastewater using granular sludge has been investigated. A lab-scale sequencing batch reactor, seeded with granular sludge developed using synthetic wastewater, was operated for 13 months under alternating anaerobic and aerobic conditions. It is demonstrated that the granules could be sustained and indeed further developed with the use of abattoir wastewater. The organic, nitrogen, and phosphorus loading rates applied were 2.7 gCOD L(-1) day(-1), 0.43 gN L(-1) day(-1), and 0.06 gP L(-1) day(-1), respectively. The removal efficiency of soluble COD, soluble nitrogen and soluble phosphorus were 85%, 93%, and 89%, respectively. However, the high suspended solids in the effluent limited the overall removal efficiency to 68%, 86%, and 74% for total COD, TN, and TP, respectively. This good nutrient removal was achieved through the process known as simultaneous nitrification, denitrification, and phosphorus removal, likely facilitated by the presence of large anoxic zones in the center of the granules. The removal of nitrogen was likely via nitrite optimizing the use of the limited COD available in the wastewater. Accumulibacter spp. were found to be responsible for most of the denitrification, further reducing the COD requirement for nitrogen and phosphorus removal. Mineral precipitation was evaluated and was not found to significantly contribute to the overall nutrient removal. It is also shown that the minimum HRT in a granular sludge system is not governed by the sludge settleability, as is the case with floccular sludge systems, but likely by the limitations associated with the transfer of substrates in granules.

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Section: Introductionmentioning

confidence: 99%

Simultaneous nitrification, denitrification, and phosphorus removal from nutrient‐rich industrial wastewater using granular sludge

Yılmaz

Lemaire

Keller

et al. 2007

Biotech & Bioengineering

232

108

View full text Add to dashboard Cite

show abstract

“…Some alterations were made in the cycle, which included altering the oxygen concentration and adding one anoxic phase. In extended aeration activated sludge plants, Bertanza (1997) achieved high total N removal efficiencies (up to 90%) with low DO concentration. This was due to simultaneous nitrification and denitrification.…”

Section: Ideal Cyclementioning

confidence: 99%

Simulation and calibration of a full-scale sequencing batch reactor for wastewater treatment

Oselame

Fernandes

Costa

2014

Braz. J. Chem. Eng.

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-The aim of this study is to apply the main mathematical models used in activated sludge reactors, the Activated Sludge Model No. 1 (ASM1) and its variations (ASM2d and ASM3), to predict the behavior of a full-scale sequencing batch reactor (SBR) used for the treatment of domestic wastewater employing the software ASIM®. Two cycles were studied, the step-feed cycle and conventional filling. Samples were taken from the raw influent, from the reactor and from the treated wastewater, and these data were used to calibrate the models. The ASM1 model was the best model to represent the cycle with only an input, while model ASM3 was the best for simulating the scaled filling cycle. This work presents calibrated parameters for the two kinds of filling. The results of these simulations indicate that the calibration process succeeded and can be used as a model for future studies.

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“…Some experimental results [7,14,15] showed that it was necessary to control the DO concentration less than 2 mg/L for SND in the activated sludge system or less than 3 mg/L in the biofilter. Low DO concentration could cause low nitrification rate and affect the TN removal.…”

Section: Effect and Choice Of Do For Sndmentioning

confidence: 99%

Factors affecting simultaneous nitrification and denitrification in an SBBR treating domestic wastewater

Peng

et al. 2007

Front.Environ.Sci.Eng.China

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Recently, researchers have become increasingly interested in the practical application of SND. The reasons are as follows: (1) the products of nitrification including nitrite and nitrate are reactants for nitrification; and (2) the nitrification produces acid and the denitrification produces alkaline. The efficient SND can save money for the construction and operation of wastewater treatment facilities and meet the requirement of carbon resource and alkalinity. Simultaneous nitrification and denitrification in a microbial reactor needs an anoxic condition and a source of carbon. The main control factors for SND are oxygen concentration, carbon and microbial condition [8][9][10].In most experiments, synthetic wastewater was used because the parameters could be controlled easily. Few reports have been found on the SND when real wastewater used in the SBBR.This work aims to determine the feasibility and the factors affecting the SND treatment of real domestic wastewater in an on-site SBBR. The variation of nitrogen, dissolved oxygen, the depth of the biofilm and influent concentration, and the mechanism of SND are evaluated. Finally, a suggestion for the SND operated in the SBBR is provided. Materials and methods Experimental systemThe SBBR for on-site domestic wastewater has been operated for about five years [11]. The sketch of the SBBR is shown in Fig. 1, and its working volume is 200 L, with a dimension of 80 cmx40 cmx110 cm. About 42 cm of the height is packed with Bauer rings with a specific surface area of 219 m 2 /m 3 to attach the biofilm. The filtrating nozzles on the bottom of the reactor are used to collect the effluent and distribute the backwash water. Aeration is performed by perforated pipe. A pump is used for water circulation during reaction and backwash.Abstract An aerobic sequencing batch biofilm reactor (SBBR) packed with Bauer rings was used to treat real domestic wastewater for simultaneous nitrification and denitrification. The SBBR is advantageous for creating an anoxic condition, and the biofilm can absorb and store carbon for good nitrification and denitrification. An average concentration of oxygen ranging from 0.8 to 4.0 mg/L was proved very efficient for nitrification and denitrification. Volumetric loads of TN dropped dramatically and effluent TN concentration increased quickly when the concentration of average dissolved oxygen was more than 4.0 mg/L. The efficiency of simultaneous nitrification and denitrification (SND) increased with increasing thickness of the biofilm. The influent concentration hardly affected the TN removal efficiency, but the effluent TN increased with increasing influent concentration. It is suggested that a subsequence for denitrification be added or influent amount be decreased to meet effluent quality requirements. At optimum operating parameters, the TN removal efficiency of 74%-82% could be achieved.

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Simultaneous nitrification-denitrification process in extended aeration plants: pilot and real scale experiences

Cited by 41 publications

References 0 publications

Simultaneous nitrification, denitrification, and phosphorus removal from nutrient‐rich industrial wastewater using granular sludge

Simultaneous nitrification, denitrification, and phosphorus removal from nutrient‐rich industrial wastewater using granular sludge

Simulation and calibration of a full-scale sequencing batch reactor for wastewater treatment

Factors affecting simultaneous nitrification and denitrification in an SBBR treating domestic wastewater

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