Responses of microbial structures, functions and metabolic pathways for nitrogen removal to different hydraulic retention times in anaerobic side-stream reactor coupled membrane bioreactors

2021 ◽  
Vol 329 ◽  
pp. 124903
Author(s):  
Xiaodan Zhao ◽  
Jie Jiang ◽  
Zhen Zhou ◽  
Yue Zheng ◽  
Yanjun Shao ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Metabolic Pathways ◽  
Membrane Bioreactors ◽  
Microbial Structures ◽  
Side Stream

Sludge reduction and microbial structures of aerobic, micro-aerobic and anaerobic side-stream reactor coupled membrane bioreactors

2018 ◽  
Vol 268 ◽  
pp. 36-44 ◽  
Author(s):  
Hongjian Pang ◽  
Zhen Zhou ◽  
Tianhao Niu ◽  
Lu-Man Jiang ◽  
Guang Chen ◽  
...  
Keyword(s):  
Membrane Bioreactors ◽  
Sludge Reduction ◽  
Microbial Structures ◽  
Side Stream ◽  
Aerobic And Anaerobic

Effects of side-stream ratio on sludge reduction and microbial structures of anaerobic side-stream reactor coupled membrane bioreactors

2017 ◽  
Vol 234 ◽  
pp. 380-388 ◽  
Author(s):  
Cheng Cheng ◽  
Zhen Zhou ◽  
Tianhao Niu ◽  
Ying An ◽  
Xuelian Shen ◽  
...  
Keyword(s):  
Membrane Bioreactors ◽  
Sludge Reduction ◽  
Microbial Structures ◽  
Side Stream

scholarly journals Nitrogen removal in a shallow maturation pond with sludge accumulated during 10 years of operation in Brazil

2017 ◽  
Vol 76 (2) ◽  
pp. 268-278 ◽  
Author(s):  
V. A. J. Rodrigues ◽  
E. F. A. Mac Conell ◽  
D. F. C. Dias ◽  
M. von Sperling ◽  
J. C. de Araújo ◽  
...  
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Metabolic Pathways ◽  
Hydraulic Retention Time ◽  
Sediment Cores ◽  
Anammox Bacteria ◽  
Daily Cycles ◽  
Polymerase Chain ◽  
Nitrification And Denitrification

Accumulated sludge in polishing (maturation) ponds reduces the hydraulic retention time (smaller useful volume), and this could potentially lead to a decrease in performance. However, settled biomass, present in the sediments, can contribute to nitrogen removal by different mechanisms such as nitrification and denitrification. This study investigated the influence of the bottom sludge present in a shallow maturation pond treating the effluent from an anaerobic reactor on the nitrification and denitrification processes. Nitrification and denitrification rates were determined in sediment cores by applying ammonia pulses. Environmental conditions in the medium were measured and bacteria detected and quantified by real-time polymerase chain reaction (real-time PCR). The pond showed daily cycles of mixing and stratification and most of the bacteria involved in nitrogen removal decreased in concentration from the upper to the lower part of the sludge layer. The results indicate that denitrifiers, nitrifiers and anammox bacteria coexisted in the sludge, and thus different metabolic pathways were involved in ammonium removal in the system. Therefore, the sediment contributed to nitrogen removal, even with a decrease in the hydraulic retention time in the pond due to the volume occupied by the sludge.

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