scholarly journals Deciphering the evolution of the functional genes and microbial community of the combined partial nitritation-anammox process with nitrate build-up and its in situ restoration

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 111702-111712 ◽  
Author(s):  
Yuanyue Wang ◽  
Hongyan Wang ◽  
Junya Zhang ◽  
Li Yao ◽  
Yuansong Wei
Keyword(s):  
Microbial Community ◽  
Retention Time ◽  
Functional Genes ◽  
Partial Nitritation ◽  
Sludge Retention Time ◽  
Anammox Process

The operation of a combined partial nitritation-anammox (CPNA) process was hampered by the overgrowth of NOB, which was then successfullyin siturestored by the combination of hydroxylamine (NH2OH) dosing and sludge retention time (SRT) control.

Impact of sludge retention time on sludge characteristics and microbial community in MBR

2011 ◽  
Vol 63 (10) ◽  
pp. 2250-2254 ◽  
Author(s):  
Yuchun Su ◽  
Jill Ruhsing Pan ◽  
Chihpin Huang ◽  
Chialing Chang
Keyword(s):  
Microbial Community ◽  
Retention Time ◽  
Membrane Fouling ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Membrane Surface ◽  
Sludge Characteristics ◽  
Sludge Retention Time ◽  
Gradient Gel Electrophoresis ◽  
Microbial Products ◽  
The Impact

In this study, the impact of sludge retention time (SRT) on sludge characteristics and microbial community and the effect on membrane fouling in membrane bioreactor (MBR) was investigated. The results show that MBR with longer SRT has less fouling propensity, in agreement with other studies, despite the fact that the MBR with longer SRT contained higher MLSS and smaller particle size. However, much more soluble microbial products (SMPs) were released in MBR with shorter SRT. More slime on the membrane surface was observed in MBR with shorter SRT while sludge cakes formed on the membrane surface in MBR with longer SRT. The results show that SMP contributes to the severe fouling observed in MBR with shorter SRT, which is in agreement with other studies showing that SMPs were the major foulants in MBR. Under different SRTs of operation, the bacterial community structures of the sludge obtained by use of polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) were almost identical, but those on the membrane surface differed substantially. It suggests that, although SRT has impact on sludge characteristics, it doesn't affect the microbial community in the suspension.

Nitrogen removal from food waste digestate using partial nitritation-anammox process: Effect of different aeration strategies on performance and microbial community dynamics

2019 ◽  
Vol 251 ◽  
pp. 109562 ◽  
Author(s):  
Alyne Duarte Pereira ◽  
Luyara de Almeida Fernandes ◽  
Helena Maria Campos Castro ◽  
Cíntia Dutra Leal ◽  
Brenda Gonçalves Piteira Carvalho ◽  
...  
Keyword(s):  
Microbial Community ◽  
Nitrogen Removal ◽  
Food Waste ◽  
Community Dynamics ◽  
Partial Nitritation ◽  
Microbial Community Dynamics ◽  
Anammox Process

scholarly journals Effect of hydraulic retention time on nitrogen removal in domestic wastewater by partial nitritation and Anammox processes

2020 ◽  
Vol 14 (2) ◽  
pp. 127-136
Author(s):  
Nguyen Thi My Hanh ◽  
Tran Thi Hien Hoa
Keyword(s):  
Nitrogen Removal ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Domestic Wastewater ◽  
Treatment Efficiency ◽  
Treatment Technology ◽  
Partial Nitritation ◽  
Conventional Technology ◽  
Nitrogen Treatment ◽  
Anammox Process

The nitrogen treatment technology using the Anammox process is known to have advantages over conventional technology of nitrification - denitrification. For the purpose of evaluating the effect of hydraulic retention time to nitrogen removal in domestic wastewater by Anammox process, the authors conducted the study on partial nitritation and Anammox reactors, separately. Partial nitritation (PN) reactor used Felibendy plate material with Nitrosomonas bacteria while Anammox (AX) reactor used Felibendy cubes carrier material with strain Candidatus Brocadia anammoxidans. This study was implemented during 210 days. The nitrogen treatment efficiency of the system was evaluated with different hydraulic retention times (HRTs). The short HRT of 4.5 hours in the AX reactor affected to the total nitrogen treatment efficiency is low of 52.76 ± 1.29%. With the hydraulic retention times in PN + AX reactors of 9 and 6 hours, the effluent quality met the requirements of B-column according to QCVN 14:2008/BTNMT or QCVN 40:2011/BTNMT. Keywords: Nitrosomonas; Candidatus Brocadia anammoxidans; partial nitritation process; Anammox process; nitrogen treatment.

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