Use low direct current electric field to augment nitrification and structural stability of aerobic granular sludge when treating low COD/NH4-N wastewater

Huang, Wenli; Wang, Wenlong; Shi, Wansheng; Lei, Zhongfang; Zhang, Zhenya; Chen, Rongzhi; Zhou, Beibei

doi:10.1016/j.biortech.2014.08.043

Cited by 39 publications

(9 citation statements)

References 31 publications

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“…Indeed, these results agree with many studies conducted at low voltages using electrophoretic forces [6], [7].…”

Section: B Effect Of Dep On the Medium Parameterssupporting

confidence: 82%

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Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Larbi¹,

Ltaief²,

Hawari³

et al. 2017

IJESD

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Abstract-Effective application of dielectrophoretic forces in membrane bioreactor (MBR) systems has the potential to suppress membrane fouling. Nevertheless, minimizing the impact of the electric field on biomass suspension is essential to maintain the efficiency of the wastewater treatment process. In this study, interdigitated cylindrical electrodes (IDE), placed inside the membrane module, were used to generate dielectrophoresis (DEP) in an MBR system. The viability of the biomass was determined at different voltages (5-150 V) after 1-hour exposure to a pulsed alternating current (AC) electric field. The results of the behavioral response of the microorganisms revealed that at low voltage applications, the bacteria exhibited good performance and no major impact was found on their viability/metabolism. Whereas at high voltage applications (beyond 100 V), the current intensity and medium temperature increased due to the joule heating effect and caused a significant decline in the bacterial activity and pollutant removal efficiency as a result of bacterial lysis.

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“…Indeed, these results agree with many studies conducted at low voltages using electrophoretic forces [6], [7].…”

Section: B Effect Of Dep On the Medium Parameterssupporting

confidence: 82%

“…It was demonstrated that the applied electric field of high voltages inside the bioreactor has the potential to repel particles away from the membrane [1]- [3]. Yet, it has been reported that different voltage strengths will have different effects on the microorganisms [4]- [7].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Larbi¹,

Ltaief²,

Hawari³

et al. 2017

IJESD

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“…Aerobic granulation is a highly complex process involving biological, chemical, and physical factors . A static magnetic field, low direct current electric field, and zero‐valent iron enhanced aerobic granulation, the diversity of the microbial community and nitrification. A static magnetic field enhanced the aerobic nitrifying granulation in which the AOB in aerobic nitrifying granules exhibited similar abundance compared to the control, but it was found to be beneficial to the growth and activity of nitrite‐oxidizing bacteria (NOB) .…”

Section: Introductionmentioning

confidence: 99%

Effects of ferrous iron on the performance and microbial community in aerobic granular sludge in relation to nutrient removal

Yılmaz

Çetin

Bozkurt

et al. 2017

Biotechnology Progress

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Lab-scale experiments were conducted to investigate the effects of ferrous iron on nutrient removal performance and variations in the microbial community inside aerobic granular sludge for 408 days. Two reactors were simultaneously operated, one without added ferrous iron (SBR1), and one with 10 mg Fe L of added ferrous iron (SBR2). A total of 1 mg Fe L of added ferrous iron was applied to SBR1 starting from the 191st day to observe the resulting variations in the nutrient removal performance and the microbial community. The results show that ammonia-oxidizing bacteria (AOB) could not oxidize ammonia due to a lack of iron compounds, but they could survive in the aerobic granular sludge. Limited ferrous iron addition encouraged nitrification. Enhanced biological phosphorus removal (EBPR) from both reactors could not be maintained regardless of the amount of ferrous iron that was applied. EBPR was established in both reactors when the concentration of mixed liquor suspended solid (MLSS) and the percentage of Accumulibacteria increased. A total of 10 mg Fe L of added ferrous iron had a relatively adverse effect on the growth of AOB species compared to 1 mg Fe L of added ferrous iron, but it encouraged the growth of Nitrospira sp. and Accumulibacteria, which requires further study. It could be said that the compact and stable structure of aerobic granular sludge preserved AOB and NOB from Fe-deficient conditions, and wash-out during the disintegration period. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:716-725, 2017.

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“…Twenty years ago aerobic granular sludge was first reported by Mishima and Nakamura (1991) in a continuous upflow aerobic sludge blanket bioreactor. Up to now much effort has been put on this promising biotechnology which possesses many incomparable advantages like excellent settleability, high biomass and ability to withstand toxicity and organic loading (Adav et al, 2008a;Huang et al, 2014) in comparison to conventional activated sludge processes. So far, research works on aerobic granular sludge are mainly focused on pollutants removal efficiency and granulation mechanism in lab-scale sequencing batch reactors (SBRs), from which the results can be utilized as guidance for its practical engineering applications (Lee et al, 2010;Maszenan et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of algae growth on aerobic granulation and nutrients removal from synthetic wastewater by using sequencing batch reactors

Huang

Zhang

et al. 2015

Bioresource Technology

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215

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The effect of algae growth on aerobic granulation and nutrients removal was studied in two identical sequencing batch reactors (SBRs). Sunlight exposure promoted the growth of algae in the SBR (Rs), forming an algal-bacterial symbiosis in aerobic granules. Compared to the control SBR (Rc), Rs had a slower granulation process with granules of loose structure and smaller particle size. Moreover, the specific oxygen uptake rate was significantly decreased for the granules from Rs with secretion of 25.7% and 22.5% less proteins and polysaccharides respectively in the extracellular polymeric substances. Although little impact was observed on chemical oxygen demand (COD) removal, algal-bacterial symbiosis deteriorated N and P removals, about 40.7-45.4% of total N and 44% of total P in Rs in contrast to 52.9-58.3% of TN and 90% of TP in Rc, respectively. In addition, the growth of algae altered the microbial community in Rs, especially unfavorable for Nitrospiraceae and Nitrosomonadaceae.

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Use low direct current electric field to augment nitrification and structural stability of aerobic granular sludge when treating low COD/NH4-N wastewater

Cited by 39 publications

References 31 publications

Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Effects of ferrous iron on the performance and microbial community in aerobic granular sludge in relation to nutrient removal

Effect of algae growth on aerobic granulation and nutrients removal from synthetic wastewater by using sequencing batch reactors

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