Nitrous oxide formation during simultaneous phosphorus and nitrogen removal in aerobic granular sludge treating different carbon substrates

2021 ◽  
pp. 126542
Author(s):  
Lennert Dockx ◽  
Michel Caluwé ◽  
Thomas Dobbeleers ◽  
Jan Dries
Keyword(s):  
Nitrous Oxide ◽  
Nitrogen Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Oxide Formation ◽  
Carbon Substrates

Nitrifier Augmentation for High Ammonia Nitrogen Removal by Aerobic Granular Sludge at Low Temperatures

2016 ◽  
Vol 44 (5) ◽  
pp. 525-531 ◽  
Author(s):  
Shuo Wang ◽  
Qianqian Yang ◽  
Wenxin Shi ◽  
Shuili Yu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Low Temperatures ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Aerobic Granular Sludge ◽  
High Ammonia

Strategies to improve aerobic granular sludge stability and nitrogen removal based on feeding mode and substrate

2019 ◽  
Vol 84 ◽  
pp. 144-154 ◽  
Author(s):  
Quan Yuan ◽  
Hui Gong ◽  
Hao Xi ◽  
Heng Xu ◽  
Zhengyu Jin ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Feeding Mode

Effect of chromium (VI) on the multiple nitrogen removal pathways and microbial community of aerobic granular sludge

2017 ◽  
Vol 39 (13) ◽  
pp. 1682-1696 ◽  
Author(s):  
Xiao-ying Zheng ◽  
Dan Lu ◽  
Ming-yang Wang ◽  
Wei Chen ◽  
Gan Zhou ◽  
...  
Keyword(s):  
Microbial Community ◽  
Nitrogen Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Chromium Vi

Effects of carbon source on N2O production in the process of simultaneous nitrification and denitrifica-tion via nitrite by aerobic granular sludge

2016 ◽  
Vol 1 (2) ◽  
pp. 10 ◽  
Author(s):  
Hong Liang ◽  
Xue Li ◽  
Shanshan Wang ◽  
Dawen Gao
Keyword(s):  
Nitrous Oxide ◽  
Carbon Source ◽  
Removal Efficiency ◽  
Release Rate ◽  
Sequencing Batch Reactor ◽  
Removal Rate ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
N Removal

A sequencing batch reactor (SBR) was used to study the effect of carbon source (C6H12O6 and CH3COONa) and C/N ratio (C/N=4:1 and C/N=7:1) on the production of nitrous oxide (N2O) in the process of simultaneous nitrifica-tion and denitrification via nitrite (short-cut SND) by aerobic granular sludge and the removal efficiency of nitrogen under low dissolved oxygen (DO). The results showed that short-cut SND occurred in this system, and the removal ef-ficiency of total nitrogen (TN) at C6H12O6 and CH3COONa were 28.93 % and 41.19 %, respectively. However, the production of N2O significantly increased when CH3COONa was used as a carbon source. In addition, the rate of N2O release when CH3COONa was a carbon source was 8.34 times the rate when C6H12O6 was the carbon source. With the increase of C/N, removal rate of TN and the efficiency of the short-cut SND were increased. The removal efficiency of TN at C/N=7:1 was 90.33%, which was 2.19 times at C/N=4:1. The percentage of short-cut SND at C/N=4:1 and C/N=7:1 were 87.47% and 95.97%, respectively. The release rate of N2O from the original 1.14 mg/(g • min) decreased to 0.10 mg/(g • min) after increased the C/N from 4:1 to 7:1.

Quick Cultivation of Micro-Aerobic Granular Sludge for Simultaneous Nitrogen Removal

2011 ◽  
Vol 415-417 ◽  
pp. 1239-1242
Author(s):  
Xiao Liu ◽  
Li Na Guo
Keyword(s):  
Nitrogen Removal ◽  
Settling Velocity ◽  
Average Particle Size ◽  
Sewage Treatment ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Average Particle ◽  
Excess Sludge ◽  
Effluent Recirculation ◽  
Oxygenation Rate

In order to accelerate the cultivation of micro-aerobic granular sludge for domestic sewage treatment, an expanded granular sludge bed (EGSB) reactor seeded with excess sludge was employed. It was found that micro-aerobic granules can form and grew compact within one month, and remained stable during the later operation, the mature cultivation had average particle size of 0.81mm, and 64% of the granules had settling velocity above 35m•h-1. Moreover, excellent COD and nitrogen removal were obtained. For hydraulic retention time (HRT) of 5h, as the recirculation ratio and oxygenation rate were set at 6.5 and 0.25g•L-1d-1respectively, COD removal ranged in 80%-91%, leaving effluent COD below 50mg•L-1. The removal efficiency of ammonium and total nitrogen (TN) were 72%-89% and 76%-87%, respectively with effluent concentration down to 3-12mg•L-1and 5-14mg•L-1. Results showed that the efficiency of simultaneous nitrogen removal was much influenced by effluent recirculation and oxygenation rate in micro-aerobic EGSB reactor.

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