Long-term effect of dissolved oxygen on partial nitrification performance and microbial community structure

Guo, Jianhua; Peng, Yongzhen; Zheng, Yanan; Huang, Huijun; Wang, Zhongwei

doi:10.1016/j.biortech.2008.12.036

Cited by 198 publications

(72 citation statements)

References 40 publications

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“…Even though SND has been studied by diverse authors, especially in the latest years (Guo et al 2013;Scaglione et al 2013;Zheng et al 2013), the application of this process has shortcomings that hinder achieving an adequate operational robustness: low growth rate of the microorganisms involved in the process, high sensitivity to moderate concentrations of sulfurs, nitrates and nitrites (Bernet et al 2001), high energy costs (Cecen 1996) and availability of organic matter (Guo et al 2009;Martins et al 2003). That is the reason why the search for improvements of the existing processes has led to the proposal of using zeolite as a microbial support and ammonium ion exchanger (Hedström 2001;Ho and Ho 2012;Mace and Mata-Alvarez 2002;Wei et al 2010;Wilderer et al 2000Wilderer et al , 2001.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

Guerrero

Montalvo

Huiliñir

et al. 2016

Int. J. Environ. Sci. Technol.

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One of the technologies used for wastewater nitrogen removal consists in simultaneous nitrificationdenitrification. The low microbial growth rate and the low availability of organic material for the denitrification stage make it necessary to study new operational conditions and the use of microbial supports. The aim of this study was to evaluate the operational behavior of a simultaneous nitrification-denitrification process in a sequential batch reactor utilizing zeolite as a biomass support and step-feed strategy. Two reactors of 2 L were used, one with zeolite and another without zeolite, both operated at constant temperature (31°C), varying nitrogen loading rate (NLR) from 0.041 to 0.113 kg total Kjeldahl nitrogen (TKN/m 3 /day). After 209 days, removals higher than 86 and 96 % in nitrogen compounds and organic matter were obtained, respectively. There was not accumulation of nitrate and nitrite in any case; this means that there was a simultaneous nitrification-denitrification in the reactors. The incorporation of zeolite in the system held higher concentration of biomass in the reactor; this led to reduce start-up to 21 days and to improve 11.31 % removal kinetic. The use of a stepfeed strategy prevents events of inhibition by substrate, even duplicating tolerance to higher NLR for the same operation time.

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Section: Introductionmentioning

confidence: 99%

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

Guerrero

Montalvo

Huiliñir

et al. 2016

Int. J. Environ. Sci. Technol.

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show abstract

“…These factors included higher free ammonia [4]- [6], hydraulic retention time (HRT) [7], [8], dissolve oxygen (DO) concentration and inhibitor [9]. However, the efficiency of biological nitrogen removal can be improved by maintaining and monitoring the ORP, pH and DO in the nitrification-denitrification process [10].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, studies of BNR process mainly used DO as a limiting factor to achieve the nitrification and MATEC Web of Conferences 147, 04008 (2018) https://doi.org/10.1051/matecconf/201814704008 SIBE 2017 denitrification [7], [11], [12]. Dissolved oxygen is also economically feasible control the parameters particularly at low concentration that can save the aeration consumption, while in some cases the efficiency of BNR can be achieved at high DO concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is no definitive explanation regarding an appropriate DO concentration to achieve complete nitrification. Guo et al [7] conducted the partial nitrification by comparing the high and low DO concentration (2.5 and 0.5 mg/L, respectively) on longterm aeration time. The complete nitrification was reached at both conditions, which corresponded increase nitrite concentration and kept constant or nearly negligible the nitrate concentration.…”

Section: Introductionmentioning

confidence: 99%

“…This indicates the appropriate application of DO for degrading organic matter and producing less sludge. In batch scale reactor, many researchers pointed that high efficiency of SND was achieved during low DO concentration [7], [15], [16], which remained organic compounds used by denitrifying bacteria. Contrary, Zhu et al [8] noted that the SND could be obtained even at high DO concentration under variances of alkalinity concentration.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Aeration Rates on Removals of Organic Carbon and Nitrogen in Small Onsite Wastewater Treatment System (Johkasou)

et al. 2018

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Abstract. Onsite application of oxygen supply in domestic wastewater system may be influenced by several factors that can inhibit the oxidation and nitrification processes. In this study, the influence of aeration rate on the Johkasou performance was focused using two Johkasou facilities serving up to five persons household. In the Johkasou A (JO-A) system, we increased the aeration rate from 30 to 63 L.min -1 whereas, in the Johkasou B (JO-B), it was decreased from 59 to 34 L.min -1 . Water and sludge samples were collected from the anaerobic-anoxic-oxic zones before and after adjustment of the aeration rate measured for organic matters and nitrogen parameters. Increasing the aeration rate in JO-A resulted in a high removal of organic matter (82.5%) and nitrogen (60.3%) compared to decreasing of aeration rate in JO-B (52.0% and 33.0%, respectively). Simultaneous nitrification and denitrification (SND) exhibited a maximum percentage when the aeration rate was increased compared to decreasing of aeration rate. These results indicate that application of a high aeration rate increases removal of organic matter and nitrogen and enhances ammonia transformation. It is therefore recommended to apply high aeration rates in Johkasou system.

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High‐Dissolved‐Oxygen Biological Process for Sludge Reduction

Wang

2012

Biological Sludge Minimization and Biomaterials/Bioenergy Recovery Technologies

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Long-term effect of dissolved oxygen on partial nitrification performance and microbial community structure

Cited by 198 publications

References 40 publications

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

Effect of Aeration Rates on Removals of Organic Carbon and Nitrogen in Small Onsite Wastewater Treatment System (Johkasou)

High‐Dissolved‐Oxygen Biological Process for Sludge Reduction

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