First Extended Anaerobic Phase Enhanced Nitrogen and Phosphorus Removal by Aerobic Granular Sludge Under Intermittent Gradient Aeration

被引：0

作者：

Zhang Y.-J. ^{[1
]}

Li D. ^{[1
]}

Wang X.-X. ^{[1
]}

Zhang F.-G. ^{[2
]}

Zhang J. ^{[1
,3
]}

机构：

[1] Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing

[2] China Northeast Municipal Engineering Design & Research Institute Co., Ltd., Changchun

[3] State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin

来源：

Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 07期

关键词：

Aerobic granular sludge(AGS); Delayed anaerobic; Denitrifying phosphorus-removing bacteria (DPAOs); Internal carbon source; Loosely bound extracellular polymeric substances (LB-EPS); Tightly bound extracellular polymeric substances (TB-EPS);

D O I：

10.13227/j.hjkx.202011124

中图分类号：

学科分类号：

摘要：

In this study, a SBR reactor was selected to explore the effect of nitrogen and phosphorus removal by aerobic granular sludge under different initial anaerobic time using intermittent gradient aeration (decreasing dissolved oxygen concentration in each aeration section) and actual domestic wastewater with low C/N ratio as the influent matrix. The results showed that the initial anaerobic stage of intermittent gradient aeration increased from 50 min to 90 min, which increased the carbon source reserves in granular sludge. This improved delayed anaerobic condition led to the improvement of nitrogen and phosphorus removal efficiency of granular sludge. When delayed to 70 and 90 min, the removal efficiency of COD, TN, and TP reached 84.74%, 70.05%, and 89.7% and 86.65%, 78.81%, and 85.5%, respectively. However, after the first anaerobic phase time was increased to 110 min, the sludge loss was more severe owing to the disintegration of some cells, leading to a decrease in internal carbon source reserves by about 13.6%. Owing to this, the pollutant removal efficiency decreased. In the process of prolonging the first anaerobic phase time from 50 min to 90 min, the content of PS in LB-EPS changed minimally; when it was delayed to 110 min, the content of PS increased to about 7.18 mg•g-1, and the PN content increased to about 5.56 mg•g-1. The contents of PN and PS in TB-EPS were stable, which indicated that the effect of internal carbon storage on LB-EPS was greater than that of TB-EPS, and the decrease in sludge settling performance was closely related to the increase in PS content in LB-EPS. The proportion of DPAOs in granular sludge increased as the first anaerobic phase time increased, and the proportion of DPAOs reached 51.5% when the first anaerobic phase time was 70 min. © 2021, Science Press. All right reserved.

引用

页码：3405 / 3412

页数：7

共 27 条

[1]

Franca R D G, Pinheiro H M, Van Loosdrecht M C M, Et al., Stability of aerobic granules during long-term bioreactor operation, Biotechnology Advances, 36, 1, pp. 228-246, (2018)

[2]

Li D, Zhang S R, Li S, Et al., The nitrogen removal of autotrophic and heterotrophic bacteria in aerobic granular reactors with different feast/famine ratio, Bioresource Technology, 272, pp. 370-378, (2019)

[3]

He Q L, Xie Z Y, Fu Z D, Et al., Interaction and removal of oxytetracycline with aerobic granular sludge, Bioresource Technology, (2021)

[4]

Long B., Rapid cultivation and application of aerobic granular sludge in SBR and continous flow reactor, (2015)

[5]

Kong Y H, Liu Y Q, Tay J H, Et al., Aerobic granulation in sequencing batch reactors with different reactor height/diameter ratios, Enzyme and Microbial Technology, 45, 5, pp. 379-383, (2009)

[6]

Lim B S, Choi B C, Yu S W, Et al., Effects of operational parameters on aeration on/off time in an intermittent aeration membrane bioreactor, Desalination, 202, 1, pp. 77-82, (2007)

[7]

Pronk M, Abbas B, Al-Zuhairy S H K, Et al., Effect and behaviour of different substrates in relation to the formation of aerobic granular sludge, Applied Microbiology and Biotechnology, 99, 12, pp. 5257-5268, (2015)

[8]

Li D, Liu B, Wang W Q, Et al., Simultaneous short-cut nitrification-denitrification phosphorus removal granules induced by phosphorus removal granules, Environmental Science, 41, 2, pp. 867-875, (2020)

[9]

Wang Y Y, Geng J J, Ren Z J, Et al., Effect of anaerobic reaction time on denitrifying phosphorus removal and N<sub>2</sub>O production, Bioresource Technology, 102, 10, pp. 5674-5684, (2011)

[10]

Dai X, Peng Y Z, Wang X X, Et al., Effect of different anaerobic time on the nutrient removal in simultaneous nitrification-denitrification and phosphorus removal (SNDPR) systems enriched with phosphorus accumulating organisms, China Environmental Science, 36, 1, pp. 92-99, (2016)

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