Nitrogen removal from synthetic wastewater by simultaneous nitrification and denitrification (SND) via nitrite in an intermittently-aerated reactor

Yoo, Hyungseok; Ahn, Kyu‐Hong; Lee, Hyung-Jib; Lee, Kwanghwan; Kwak, Youn-Jung; Song, Kyung Guen

doi:10.1016/s0043-1354(98)00159-6

Cited by 322 publications

(152 citation statements)

References 15 publications

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“…After 7 days of denitrification in SW, biomass flocks were formed. In similar denitrification tests, Yoo et al [25] showed a relatively rapid fall of the original MLSS concentration in the intermittently aerated reactor at HRT of 25 h. Nevertheless, their results and the results obtained in the present study show that such a fall did not affect COD and nitrate removal. The numbers of bacterial colonies (CFU), grown on the standard nutrient agar and on the hardened feed solution, were compared in order to determine the presence of true denitrifiers.…”

Section: The Denitrification Process In the Continuous-flow Stirred Rcontrasting

confidence: 50%

Wastewater denitrification process—the influence of methanol and kinetic analysis

Foglar

Briški

2003

Process Biochemistry

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The aim of this work was to achieve rapid nitrate removal from synthetic wastewater (SW) without nitrite accumulation and to improve the economic effectiveness of the process. For that purpose, experiments were carried out to determine the influence of methanol on denitrification rate in batch assays and in the continuous-flow stirred cultures. Nitrate Á/N (200 mgNO 3 ( Á/N/l) was reduced under anoxic conditions during approximately 4 Á/6 h for the MeOH/NO 3 ( Á/N ratio above 2.5. Nitrite concentration was elevated to the maximum of 1.2 mgNO 2 ( Á/N/l and at the end of the tests nitrite concentrations were 0.06 Á/0.1 mgNO 2 ( Á/N/l. At lower MeOH/NO 3 ( Á/N ratios the denitrification process stopped after exhaustion of methanol. The analysis of experimental results showed that denitrification was a zero-order reaction with respect to nitrate and a first-order reaction with respect to the biomass concentration (the first-order overall reaction). In the continuous denitrification process during 45 days the hydraulic retention time (HRT) was decreased from 62 to 28 h. Dissolved oxygen concentration fell from 5.50 to 0.40 mgO 2 /l during the first 4 h, but over 3 days of continuous flow it increased to 2.5 mgO 2 /l and remained at that level. Accumulation of nitrite ions in SW was similar to that in batch tests, but at an HRT of 28 h the nitrite concentration increased to 6 mgNO 2 ( Á/N/l. Complete denitrification at 25 8C was achieved at nitrate and methanol loading rates of 4.35 mgNO 3 ( Á/N/l h and 23 mgO 2 /l h, respectively.

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Section: The Denitrification Process In the Continuous-flow Stirred Rcontrasting

confidence: 50%

Wastewater denitrification process—the influence of methanol and kinetic analysis

Foglar

Briški

2003

Process Biochemistry

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“…The author suggests it is enough to keep the temperature at 25°C when reactor system's temperature is the sole parameter. The experimental results of Yoo et al (1999) also held out this suggestion.…”

Section: Methods and Strategies For Achieving And Maintaining Partialmentioning

confidence: 57%

“…So raising temperature cannot only promote the growth rates of AOB, but can also expand the differences of specific growth rates between AOB and NOB, which was verified by some researchers (Yoo et al 1999). Tonkovic (1998) noted that nitrite accumulated in an activated sludge plant especially over the summer period.…”

Section: Methods and Strategies For Achieving And Maintaining Partialmentioning

confidence: 85%

“…Using of intermittent aeration was in favor of implementation of nitrite accumulation (Pollice et al 2002a,b). Also, the continuous feeding of the influent wastewater from the bottom of the reactor was critical for effective nitrification and denitrification via nitrite (Yoo et al 1999). As the induction of the different denitrification enzymes proceeds sequentially, the different intermediates of denitrification accumulate temporarily after the switch from aerobic to anoxic conditions.…”

Section: Operational and Aeration Patternmentioning

confidence: 99%

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Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Peng

Zhu

2006

Appl Microbiol Biotechnol

525

230

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Presently, the wastewater treatment practices can be significantly improved through the introduction of new microbial treatment technologies. To meet increasingly stringent discharge standards, new applications and control strategies for the sustainable removal of ammonium from wastewater have to be implemented. Partial nitrification to nitrite was reported to be technically feasible and economically favorable, especially when wastewater with high ammonium concentrations or low C/N ratios is treated. For successful implementation of the technology, the critical point is how to maintain partial nitrification of ammonium to nitrite. Partial nitrification can be obtained by selectively inhibiting nitrite oxidizing bacteria through appropriate regulation of the system's DO concentration, microbial SRT, pH, temperature, substrate concentration and load, operational and aeration pattern, and inhibitor. The review addressed the microbiology, its consequences for their application, the current status regarding application, and the future developments.

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“…In order to monitor the nitrification process According to literatures and a study by Yoo et al, 1999, the optimum pH condition for nitrifying bacteria is 7.5 to 8.6. For this study, the value of pH was maintained between the ranges of 7.7 to 8.2 indicating satisfactory condition of the reactor.…”

Section: Nh 4 + -N and No 3 --N Removalmentioning

confidence: 99%

Nitrogen Removal from an Aerobically Digested Domestic Wastewater using Anoxic/Oxic (A/O) Reactor Packed with Non-woven Filter Materials

Ladu¹,

Wei²,

Lü³

et al. 2013

Orientjchem.

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Nitrogen removal from synthetic wastewater by simultaneous nitrification and denitrification (SND) via nitrite in an intermittently-aerated reactor

Cited by 322 publications

References 15 publications

Wastewater denitrification process—the influence of methanol and kinetic analysis

Wastewater denitrification process—the influence of methanol and kinetic analysis

Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Nitrogen Removal from an Aerobically Digested Domestic Wastewater using Anoxic/Oxic (A/O) Reactor Packed with Non-woven Filter Materials

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