Understanding the dependence of start-up and stability of aerobic granule on pH from the perspective of adhesion behavior and properties of extracellular polymeric substances

2021 ◽  
pp. 111311
Author(s):  
Zhengwen Li ◽  
Huiqi Li ◽  
Rui Tang ◽  
Chunli Wan ◽  
Chen Zhang ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Aerobic Granule ◽  
Adhesion Behavior ◽  
Start Up

Effects of extracellular polymeric substances on granulation of anoxic sludge in sequencing batch reactor

2012 ◽  
Vol 66 (3) ◽  
pp. 543-548
Author(s):  
Binbin Wang ◽  
Shunlian Liu ◽  
Hongmei Zhao ◽  
Xinyan Zhang ◽  
Dangcong Peng
Keyword(s):  
Extracellular Polymeric Substances ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Cation Exchange Resin ◽  
Granular Sludge ◽  
Extracellular Proteins ◽  
Extracellular Polysaccharides ◽  
Positive Role ◽  
Start Up ◽  
Sludge Granulation

Variations of extracellular polymeric substances (EPS) and its components with sludge granulation were examined in a lab-scale sequencing batch reactor (SBR) which was fed with sodium nitrate and sodium acetate. Ultrasonication plus cation exchange resin (CER) were used as the EPS extraction method. Results showed that after approximately 90 d cultivation, the sludge in the reactor was almost granulated. The content of extracellular polysaccharides increased from 10.36 mg/g-VSS (volatile suspended solids) at start-up with flocculent sludge to 23.18 mg/g-VSS at 91 d with matured granular sludge, while the content of extracellular proteins were almost unchanged. Polysaccharides were the major components of EPS in anoxic granular sludge, accounting for about 70.6–79.0%, while proteins and DNA accounted for about 16.5–18.9% and 4.6–9.9%, respectively. It is proposed that EPS play a positive role in anoxic sludge granulation and polysaccharides might be strongly involved in aggregation of flocs into granules.

Role and significance of extracellular polymeric substances on the property of aerobic granule

2012 ◽  
Vol 107 ◽  
pp. 46-54 ◽  
Author(s):  
Liang Zhu ◽  
Mei-le Lv ◽  
Xin Dai ◽  
Yan-wen Yu ◽  
Han-ying Qi ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Aerobic Granule

Start-up of two moving bed membrane bioreactors treating saline wastewater contaminated by hydrocarbons

2015 ◽  
Vol 73 (4) ◽  
pp. 716-724 ◽  
Author(s):  
R. Campo ◽  
N. Di Prima ◽  
G. Freni ◽  
M. G. Giustra ◽  
G. Di Bella
Keyword(s):  
Extracellular Polymeric Substances ◽  
Membrane Surface ◽  
Membrane Bioreactors ◽  
Moving Bed ◽  
Biological Removal ◽  
Start Up ◽  
Suspended Biomass ◽  
Polyurethane Sponge ◽  
Microbial Products ◽  
The One

This work aims to assess the acclimation of microorganisms to a gradual increase of salinity and hydrocarbons, during the start-up of two moving bed membrane bioreactors (MB-MBRs) fed with saline oily wastewater. In both systems an ultrafiltration membrane was used and two types of carriers were employed: polyurethane sponge cubes (MB-MBRI) and polyethylene cylindrical carriers (MB-MBRII). A decreasing dilution factor of slops has been adopted in order to allow biomass acclimation. The simultaneous effect of salinity and hydrocarbons played an inhibitory role in biomass growth and this resulted in a decrease of the biological removal efficiencies. A reduction of bound extracellular polymeric substances and a simultaneous release of soluble microbial products (SMPs) were observed, particularly in the MB-MBRII system, probably due to the occurrence of a greater suspended biomass stress as response to the recalcitrance of substrate. On the one hand, a clear attachment of biomass occurred only in MB-MBRI and this affected the fouling deposition on the membrane surface. The processes of detachment and entrapment of biomass, from and into the carriers, significantly influenced the superficial cake deposition and its reversibility. On the other hand, in MB-MBRII, the higher production of SMPs implied a predominance of the pore blocking.

scholarly journals Morphological study of biomass during the start-up period of a fixed-bed anaerobic reactor treating domestic sewage

2005 ◽  
Vol 48 (5) ◽  
pp. 841-849 ◽  
Author(s):  
Cláudio Antonio Andrade Lima ◽  
Rogers Ribeiro ◽  
Eugenio Foresti ◽  
Marcelo Zaiat
Keyword(s):  
Polyurethane Foam ◽  
Morphological Study ◽  
Extracellular Polymeric Substances ◽  
Fixed Bed ◽  
Morphological Characteristics ◽  
Morphological Diversity ◽  
Domestic Sewage ◽  
Fixed Bed Reactor ◽  
Start Up ◽  
Colonization Process

This work focused on a morphological study of the microorganisms attached to polyurethane foam matrices in a horizontal-flow anaerobic immobilized biomass (HAIB) reactor treating domestic sewage. The experiments consisted of monitoring the biomass colonization process of foam matrices in terms of the amount of retained biomass and the morphological characteristics of the cells attached to the support during the start-up period. Non-fluorescent rods and cocci were found to predominate in the process of attachment to the polyurethane foam surface. From the 10th week of operation onwards, an increase was observed in the morphological diversity, mainly due to rods, cocci, and Methanosaeta-like archaeal cells. Hydrodynamic problems, such as bed clogging and channeling occurred in the fixed-bed reactor, mainly due to the production of extracellular polymeric substances and their accumulation in the interstices of the bed causing a gradual deterioration of its performance, which eventually led to the system's collapse. These results demonstrated the importance and usefulness of monitoring the dynamics of the formation of biofilm during the start-up period of HAIB reactors, since it allowed the identification of operational problems.

scholarly journals Extracellular polymeric substances and structural stability of aerobic granule

2008 ◽  
Vol 42 (6-7) ◽  
pp. 1644-1650 ◽  
Author(s):  
Sunil S. Adav ◽  
Duu-Jong Lee ◽  
Joo-Hwa Tay
Keyword(s):  
Structural Stability ◽  
Extracellular Polymeric Substances ◽  
Aerobic Granule
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