Development of an integrated ultrasonic biofilm detachment model for biofilm thickness control in membrane aerated bioreactors

2021 ◽  
Author(s):  
Maryam Ghasemi ◽  
Sheng Chang ◽  
Sivabal Sivaloganathan
Keyword(s):  
Thickness Control ◽  
Biofilm Thickness ◽  
Biofilm Detachment

scholarly journals Kinetics of Biofilm Detachment

1992 ◽  
Vol 26 (9-11) ◽  
pp. 1995-1998 ◽  
Author(s):  
B. M. Peyton ◽  
W. G. Characklis
Keyword(s):  
Steady State ◽  
Utilization Rate ◽  
Carbon Utilization ◽  
Biofilm Thickness ◽  
First Order ◽  
Detachment Rate ◽  
Biofilm Detachment ◽  
Biofilm Modeling ◽  
Kinetics Of ◽  
Sensitive Variable

In predictive biofilm modeling, the detachment rate coefficient may be the most sensitive variable affecting both the predicted rate and the extent of biofilm accumulation. At steady state the detachment rate must be equal to the net growth rate in the biofilm. In systems where organic carbon is growth-limiting, the substrate carbon utilization rate determines the net biomass production rate and, therefore, the steady state biomass detachment rate. Detachment rates, first order with biofilm thickness, fit the experimental data well, but are not predictive since the coefficients must be determined experimentally.

scholarly journals Temporal Quorum-Sensing Induction Regulates Vibrio cholerae Biofilm Architecture

2006 ◽  
Vol 75 (1) ◽  
pp. 122-126 ◽  
Author(s):  
Zhi Liu ◽  
Fiona R. Stirling ◽  
Jun Zhu
Keyword(s):  
Quorum Sensing ◽  
Vibrio Cholerae ◽  
Biofilm Formation ◽  
High Cell Density ◽  
Intestinal Colonization ◽  
Signal Molecule ◽  
Biofilm Thickness ◽  
Sensing Systems ◽  
Biofilm Detachment ◽  
Biofilm Architecture

ABSTRACT Vibrio cholerae, the pathogen that causes cholera, also survives in aqueous reservoirs, probably in the form of biofilms. Quorum sensing negatively regulates V. cholerae biofilm formation through HapR, whose expression is induced at a high cell density. In this study, we show that the concentration of the quorum-sensing signal molecule CAI-1 is higher in biofilms than in planktonic cultures. By measuring hapR expression and activity, we found that the induction of quorum sensing in biofilm-associated cells occurs earlier. We further demonstrate that the timing of hapR expression is crucial for biofilm thickness, biofilm detachment rates, and intestinal colonization efficiency. These results suggest that V. cholerae is able to regulate its biofilm architecture by temporal induction of quorum-sensing systems.

Membrane Aerated Biofilm Reactors for Thermomechanical Pulping Pressate Treatment

2016 ◽  
Vol 14 (5) ◽  
pp. 1017-1024 ◽  
Author(s):  
M. R. Zheng ◽  
B. Q. Liao
Keyword(s):  
Oxygen Demand ◽  
Cod Removal ◽  
Biofilm Thickness ◽  
Biofilm Reactors ◽  
Membrane Surfaces ◽  
Treated Effluent ◽  
Biofilm Detachment ◽  
Thermomechanical Pulping ◽  
Cycle Lengths ◽  
Soluble Chemical Oxygen Demand

Abstract A comparative study on the treatment of thermomechanical pulping (TMP) pressate between thermophilic (55 °C) and mesophilic (30 °C) membrane aerated biofilm reactors (MABRs) was conducted under different cycle lengths (CLs) for over 114 days. The performance of the MABRs was evaluated in terms of soluble chemical oxygen demand (COD) removal and biofilm detachment. With a total influent COD of 3,700–4,100 mg/L, the soluble COD removal efficiency of thermophilic MABR (40–65 %) was slightly lower than that of mesophilic MABR (50–80 %) under different CLs. The level of effluent suspended solids (ESS) in treated effluent of the thermophilic MABR was generally higher than that of the mesophilic MABR, suggesting a more significant biofilm detachment from membrane surfaces in the thermophilic MABR. The performance of COD removal improved at the time five to ten days after each significant biofilm detachment. The results suggest that MABR is a promising technology for TMP pressate treatment and biofilm thickness control is important for achieving better performance.

The Importance of Aerobic Mixing, Biofilm Thickness Control and Modeling on the Success or Failure of IFAS Systems for Biological Nutrient Removal

2007 ◽  
Vol 1 (5) ◽  
pp. 1-18 ◽  
Author(s):  
Dipankar Sen ◽  
Clifford W. Randall ◽  
Rhodes R. Copithorn ◽  
Markku Huhtamäki ◽  
Greg Farren ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Biological Nutrient Removal ◽  
Thickness Control ◽  
Biofilm Thickness

Simultaneous Diameter and Thickness Control in Tube Extrusion

1991 ◽  
Vol 6 (3) ◽  
pp. 188-194 ◽  
Author(s):  
G. Defaye ◽  
L. Caralp ◽  
B. Delfanne ◽  
J. J. Labaig
Keyword(s):  
Thickness Control ◽  
Tube Extrusion

TEM Sample Prep Tool Matching—DualBeam FIB Cut Look and Measure Monitoring for Process Control and Development in a 300 mm IC Fab

2016 ◽  
Author(s):  
Jangbae Jeon
Keyword(s):  
Process Control ◽  
Sample Preparation ◽  
Continuous Improvement ◽  
Process Time ◽  
Operational Monitoring ◽  
Thickness Control ◽  
Running Time ◽  
End Products ◽  
Novel Method

Abstract This work presents a novel method of continuous improvement for faster, better and cheaper TEM sample preparation using Cut Look and Measure (CLM). The improvement of the process is executed by operational monitoring of daily beam conditions, end products, bulk thickness control, recipe usage and tool running time. This process produces a consequent decrease in rework rate and process time. In addition, it also increases throughput with better quality TEM samples.

Heating up trickling filters to tackle cold weather conditions

2000 ◽  
Vol 41 (1) ◽  
pp. 163-166 ◽  
Author(s):  
W. Gebert ◽  
P.A. Wilderer
Keyword(s):  
Waste Heat ◽  
Treatment Plant ◽  
Weather Conditions ◽  
Pilot Scale ◽  
Cold Weather ◽  
Filling Material ◽  
Trickling Filter ◽  
Biofilm Thickness ◽  
Trickling Filters ◽  
Biofilm Support

The investigated effects of heating the filling material in trickling filters were carried out at the Ingolstadt wastewater treatment plant, Germany. Two pilot scale trickling filters were set up. Heat exchanger pipings were embedded in the filter media of one of these trickling filters, and the temperature in the trickling filter was raised. The other trickling filter was operated under normal temperature conditions, and was used as a control. The results clearly demonstrate that the performance of trickling filters cannot be constantly improved by heating the biofilm support media. A sustained increase of the metabolic rates did not occur. The decrease of the solubility of oxgen in water and mass transfer limitations caused by an increase of the biofilm thickness are the main reasons for that. Thus, the heating of trickling filters (e.g. by waste heat utilization) in order to increase the capacity of trickling filters under cold weather conditions cannot be recommended.

Response modulation of PdNi nano-film hydrogen sensors by thickness control

2021 ◽  
pp. 150064
Author(s):  
Jiawei Tian ◽  
Hongchuan Jiang ◽  
Xinwu Deng ◽  
Xiaohui Zhao ◽  
Jiayue Tian ◽  
...  
Keyword(s):  
Response Modulation ◽  
Hydrogen Sensors ◽  
Thickness Control
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