Physical properties and Extracellular Polymeric Substances pattern of aerobic granular sludge treating hypersaline wastewater

2017 ◽  
Vol 229 ◽  
pp. 152-159 ◽  
Author(s):  
Santo Fabio Corsino ◽  
Marco Capodici ◽  
Michele Torregrossa ◽  
Gaspare Viviani
Keyword(s):  
Physical Properties ◽  
Extracellular Polymeric Substances ◽  
Granular Sludge ◽  
Aerobic Granular Sludge

Dewaterability of Aerobic Granular Sludge

2011 ◽  
Vol 90-93 ◽  
pp. 2944-2948 ◽  
Author(s):  
Yan Nian Zhou ◽  
Jun Li ◽  
Jing Li ◽  
Su Wei
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Specific Resistance ◽  
Structural Characteristics ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Sludge Treatment ◽  
Distribution Features ◽  
Water Ratio

Dewatering characteristics of aerobic granular sludge, activated sludge and sludge which mixed flocculant was studied. It was shown that the specific resistance of aerobic granular sludge is lower than activated sludge and sludge with mixed flocculant was in the range of 1.07~1.80×109 S2/g, and it increased with the increase of diameters of the granules. The water ratio of aerobic granular sludge by pressure filtrate dehydration was decreased to 83.5~86.1%, activated sludge and sludge which mixed flocculant were 94.2% and 91.4%, respectively. The structural characteristics, distribution features of extracellular polymeric substances and PN/PS values of aerobic granular sludge were important factors of its excellent dewaterability. Aerobic granular sludge technology was regarded as one of the promising biotechnologies in sludge treatment.

scholarly journals Effect of Increased Influent COD on Relieving the Toxicity of CeO2 NPs on Aerobic Granular Sludge

2019 ◽  
Vol 16 (19) ◽  
pp. 3609 ◽  
Author(s):  
Xiaoying Zheng ◽  
Yuan Zhang ◽  
Wei Chen ◽  
Weihong Wang ◽  
Hang Xu ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Oxygen Demand ◽  
Granular Sludge ◽  
Inhibitory Effect ◽  
Environmental Risks ◽  
Pollutant Removal ◽  
Aerobic Granular Sludge ◽  
Long Term Effects ◽  
Negative Effects

Due to the increased use of cerium oxide nanoparticles (CeO2 NPs), their potential environmental risks have caused concern. However, their effects on the aerobic granular sludge (AGS) process and the later recovery of AGS are still unclear. In this study, we comprehensively determined the changes in pollutant removal and the levels of extracellular polymeric substances (EPS) in AGS that were exposed to CeO2 NP treatments (0 (the control, R0), 1 (R1), and 5 (R5) mg/L), following an increase in the influent chemical oxygen demand (COD). An increase in the CeO2 NP concentration enhanced their inhibitory effect on the removal of total nitrogen (TN) and total phosphorus (TP), and promoted the production of polysaccharides (PS) and proteins (PN) in loosely bound EPS (LB-EPS) or tightly bound EPS (TB-EPS), as well as the dissolved organic carbon (DOC) components in EPS, but had no long-term effects on the removal of organic matter. When the addition of CeO2 NPs was stopped and the concentration of influent COD increased, the TN and TP removal efficiencies in R1 and R5 slowly increased and recovered. In R1, they were only 4.55 ± 0.55% and 2.71 ± 0.58% lower than in R0, respectively, while the corresponding values for R5 were 5.06 ± 0.46% and 6.20 ± 0.63%. Despite the LB-EPS and TB-EPS concentrations in the R1 and R5 treatments recovering and being similar to the levels in the control when no CeO2 NPs were added, they were still slightly higher than in the R0, which indicating that the negative effects of CeO2 NPs could not be completely eliminated due to the residual CeO2 NP levels in AGS.

scholarly journals Storage of aerobic granular sludge embedded in agar and its reactivation by real wastewater

2018 ◽  
Vol 16 (6) ◽  
pp. 958-969 ◽  
Author(s):  
Yuanyuan Cheng ◽  
Xinpeng Xuan ◽  
Linan Zhang ◽  
Jue Zhao ◽  
Bei Long
Keyword(s):  
Suspended Solids ◽  
Extracellular Polymeric Substances ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Utilization Rate ◽  
Oxygen Utilization ◽  
Mixed Liquor ◽  
Offensive Odour ◽  
Real Wastewater ◽  
Oxygen Utilization Rate

Abstract Aerobic granular sludge (AGS) was preserved using an agar embedding method to maintain its stability. No obvious damage was imposed on the granular appearance during 30 days of cold and dry storage, but the granular microstructure had an uneven surface with a large number of holes. The results were consistent with the extinction of microbial communities and the monitored consumption of extracellular polymeric substances, in which granular specific oxygen utilization rate and mixed liquor volatile suspended solids/mixed liquor suspended solids ratio, respectively, decreased by 72.4% and 62.5% during storage. A mass conversation calculation indicated that the loss of granular mass was 1.6393 g. An offensive odour was smelled during storage, and the results indicated that a material transformation and mitigation were involved between AGS and the gas phase. Although the granular structure was destroyed to a certain extent, no obvious damage was imposed on the granular skeleton during storage. After it was aerated again after a feeding with real wastewater, the residual skeleton served as a carrier for the rapid proliferation of microorganisms, and good granular properties were obtained after 11 days of reactivation.

Aerobic granular sludge membrane bioreactor (AGMBR): Extracellular polymeric substances (EPS) analysis

2019 ◽  
Vol 156 ◽  
pp. 305-314 ◽  
Author(s):  
Oliver Terna Iorhemen ◽  
Rania Ahmed Hamza ◽  
Mohamed Sherif Zaghloul ◽  
Joo Hwa Tay
Keyword(s):  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Granular Sludge ◽  
Aerobic Granular Sludge
Sign in / Sign up

Export Citation Format

Share Document