Elucidating the intensifying effect of introducing influent to an anaerobic side-stream reactor on sludge reduction of the coupled membrane bioreactors

2021 ◽  
pp. 125931
Author(s):  
Mengyu Wang ◽  
Ying An ◽  
Jing Huang ◽  
Xiao Sun ◽  
Aming Yang ◽  
...  
Keyword(s):  
Membrane Bioreactors ◽  
Sludge Reduction ◽  
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

Effects of bioporous carriers on the performance and microbial community structure in side-stream anaerobic membrane bioreactors

2020 ◽  
Vol 66 (8) ◽  
pp. 475-489 ◽  
Author(s):  
Bin Zhang ◽  
Jiao Yue ◽  
Yu Guo ◽  
Taixin Liu ◽  
Min Zhou ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Oxygen Demand ◽  
Illumina Miseq ◽  
Membrane Bioreactors ◽  
Pollutant Removal ◽  
Sludge Reduction ◽  
Porous Carrier ◽  
Side Stream

The aim of this study was to investigate the effects of a volcanic rock porous carrier (VRPC) on sludge reduction, pollutant removal, and microbial community structure in an anaerobic side-stream reactor (ASSR). Three lab-scale membrane bioreactors (MBRs), including an anoxic–oxic MBR, which served as the control (C-MBR), an ASSR-coupled MBR (A-MBR), and an A-MBR filled with VRPC (FA-MBR) were stably and simultaneously operated for 120 days. The effect of the three reactors on the removal of chemical oxygen demand (COD) was almost negligible (all greater than 95%), but the average removal efficiency of ammonium nitrogen, total nitrogen, and total phosphorus was significantly improved by the insertion of an ASSR, especially when the ASSR was filled with VRPC. Finally, A-MBR and FA-MBR achieved 16.2% and 26.4% sludge reduction rates, with observed sludge yields of 0.124 and 0.109 g mixed liquid suspended solids/g COD, respectively. Illumina MiSeq sequencing revealed that microbial diversity and richness were highest in the VRPC, indicating that a large number of microorganisms formed on the carrier surface in the form of a biofilm. Abundant denitrifying bacteria (Azospira, Comamonadaceae_unclassified, and Flavobacterium) were immobilized on the carrier biofilm, which contributed to increased nitrogen removal. The addition of a VRPC to the ASSR successfully immobilized abundant hydrolytic, fermentative, and slow-growing microorganisms, which all contributed to reductions in sludge yield.

Sludge reduction potential of metazoa in membrane bioreactors

2001 ◽  
Vol 44 (10) ◽  
pp. 197-202 ◽  
Author(s):  
B.S. Luxmy ◽  
T. Kubo ◽  
K. Yamamoto
Keyword(s):  
Treatment Plant ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Transmembrane Pressure ◽  
Sludge Reduction ◽  
Fouling Control ◽  
Steady Level ◽  
Effective Role ◽  
Real Wastewater ◽  
Reduction Capacity

In order to check the sludge reduction capacity of metazoa in a membrane bioreactor (MBR), pilot-scale studies were conducted. Three MBRs had been set in a wastewater treatment plant at Tokyo, Japan and they were receiving real wastewater. Initially pH inside the three MBRs was controlled as pH 7, 6 and 5 respectively. Then metazoa population was monitored along with MLSS change. It was found that the presence or absence of the metazoa population did not have any significant effect on the increasing pattern of MLSS. In the MBR with pH 6 highest accumulation of sludge was observed though a high and steady level of metazoa (1,000-2,000 per ml) was present there. But in this MBR a lot of metazoa attached in the membrane was also observed and here the increase in transmembrane pressure was less than in the other two. So, metazoa population especially the attached one in the membrane plays an effective role in fouling control of the membrane. Presence of attached media may provide a suitable niche for metazoa in the process. So, attached media known as DB lace was also inserted in MBRs for testing its capacity along with inoculum of oligochaete worms. Accumulation of sludge was not satisfactory in the attached string and it seems that inoculated worm could not adjust to the environment as they were not sludge originated. So, in the next experimental stage, attached media was inserted in the form of a bundle and this time no inoculation of worm was used. A steady metazoa population was observed in the system but the accumulation of sludge in the attached media was the same as before.

scholarly journals The effects of a full-scale anaerobic side-stream reactor on sludge decay and biomass activity

2019 ◽  
Vol 79 (6) ◽  
pp. 1081-1091 ◽  
Author(s):  
V. F. Velho ◽  
G. Andreottola ◽  
P. Foladori ◽  
R. H. R. Costa
Keyword(s):  
Activated Sludge ◽  
Mass Balance ◽  
Oxygen Demand ◽  
Full Scale ◽  
Sludge Reduction ◽  
Solid Mass ◽  
Anaerobic Conditions ◽  
Side Stream ◽  
Biomass Activity ◽  
Heterotrophic Biomass

Abstract A full-scale anaerobic side-stream reactor (ASSR) for sludge reduction was monitored in terms of sludge production and compared with the previous conventional activated sludge configuration (CAS). A detailed solid mass balance was calculated on the whole full-scale plant to estimate the sludge reduction associated with the ASSR. The activity of the biomass, which undergoes alternation of aerobic and anaerobic conditions, was investigated by the respirometric test. The ASSR promoted a reduction of heterotrophic biomass activity and the substrate consumption rate in the activated sludge implemented with ASSR (AS + ASSR) was 36% smaller than in the CAS period. The solid mass balance indicated a sludge reduction of 28%. During the 270-day operation, the observed sludge yield passed from 0.438 kgTSS/kgCOD in the CAS to 0.315 in the AS + ASSR configuration. The solubilization of chemical oxygen demand (COD), NH4+-N and orthophosphate were verified under anaerobic conditions. The results suggest that the possible mechanisms of sludge reduction were the increase of the system sludge retention time (SRT) by ASSR addition, and the reduction in heterotrophic biomass activity added to the organic compounds' hydrolysis.

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