Critical flux determination by the flux-step method in a submerged membrane bioreactor

2003 ◽  
Vol 227 (1-2) ◽  
pp. 81-93 ◽  
Author(s):  
Pierre Le Clech ◽  
Bruce Jefferson ◽  
In Soung Chang ◽  
Simon J. Judd
Keyword(s):  
Membrane Bioreactor ◽  
Step Method ◽  
Critical Flux ◽  
Submerged Membrane Bioreactor ◽  
Flux Determination

Impact of chemical cleaning and air-sparging on the critical and sustainable flux in a flat sheet membrane bioreactor for municipal wastewater treatment

2008 ◽  
Vol 57 (12) ◽  
pp. 1873-1879 ◽  
Author(s):  
G. Guglielmi ◽  
D. Chiarani ◽  
D. P. Saroj ◽  
G. Andreottola
Keyword(s):  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Membrane Surface ◽  
Municipal Wastewater Treatment ◽  
Chemical Cleaning ◽  
Critical Flux ◽  
Submerged Membrane Bioreactor ◽  
Flat Sheet ◽  
Exponential Trend ◽  
Flat Sheet Membrane

The paper discusses the experimental optimisation of both chemical and mechanical cleaning procedures for a flat-sheet submerged membrane bioreactor fed with municipal wastewater. Fouling was evaluated by means of the critical flux concept, which was experimentally measured by short-term flux-stepping tests. By keeping constant most important parameters of the biological process (MLSS, sludge age), two different chemical cleaning protocols (2,000 mg L−1 NaOCl and 200 mg L−1 NaOCl) were applied with different frequency and, after approximately 9 months of operation, the criticality threshold was determined under different values of SADm (specific aeration demand per unit of membrane surface area). The weaker and more frequent chemical cleaning regime (200 mg L−1, monthly) proved much more effective than the stronger and less frequent strategy (2,000 mg L−1, once every three months). The improvement of performances was quantified by two TMP-based parameters, the fouling rate and the ΔTMP (difference between TMP values during the increasing and decreasing phase of hysteresis). The best performing configuration was then checked over a longer period by running four long-term trials showing an exponential trend of the sub-critical fouling rate with the imposed flux.

Performance and fouling characterization of a five-bore hollow fiber membrane in a membrane bioreactor for the treatment of printing and dyeing wastewater

2016 ◽  
Vol 87 (1) ◽  
pp. 102-109 ◽  
Author(s):  
Chunyan Ma ◽  
Xiaoqian Wu ◽  
Zhenhong Liu
Keyword(s):  
Hollow Fiber ◽  
Membrane Bioreactor ◽  
Hollow Fiber Membrane ◽  
Oxygen Demand ◽  
Dyeing Wastewater ◽  
Fiber Membrane ◽  
Step Method ◽  
Critical Flux ◽  
Printing And Dyeing Wastewater ◽  
Cake Layer

Filtration performance and fouling behavior of a five-bore hollow fiber membrane was investigated in a membrane bioreactor (MBR) treating printing and dyeing wastewater. A normal single-bore hollow fiber membrane module was used in the same bioreactor for comparison. During an operation over 30 days, the results of chemical oxygen demand (COD) and color removals demonstrated that the five-bore membrane was favorable for this wastewater treatment. The critical flux ( Jc) of the five-bore membrane and the single-bore membrane was determined at 21 and 15 L/(m2·h), respectively, using a flux-step method. During a steady running at sub-critical flux of 10 L/(m2·h) without cleaning for 50 days, the average increasing rates of trans-membrane pressure (TMP) for five-bore and single-bore membranes were 0.356 kPa/d and 0.444 kPa/d, respectively, indicating that the five-bore membrane had better fouling resistance. The total resistance values of five-bore membrane and single-bore membrane were 8.68 and 14.1 m−1, respectively. Scanning electron microscope (SEM) and atomic force microscope (AFM) results confirmed the cake layer resistance for five-bore membrane was much lower than single-bore membrane. It was expected that the membrane structure, especially the membrane diameter, influenced the anti-fouling property of five-bore membrane.

Biofouling Aspects and Critical Flux Evaluation in an Intermittently Aerated and Fed Submerged Membrane Bioreactor

2016 ◽  
Vol 3 (S1) ◽  
pp. 23-33 ◽  
Author(s):  
Paraschos Melidis ◽  
Spyridon Ntougias ◽  
Varvara Vasilatou ◽  
George Skouteris ◽  
Konstantinos Azis ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
Critical Flux ◽  
Submerged Membrane Bioreactor

Critical flux on a submerged membrane bioreactor for nitrification of source separated urine

2021 ◽  
Author(s):  
Jiaxi Jiang ◽  
Sherub Phuntsho ◽  
Nirenkumar Pathak ◽  
Qilin Wang ◽  
Jaeweon Cho ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
Critical Flux ◽  
Submerged Membrane Bioreactor

scholarly journals Effect of Mixed Liquor Volatile Suspended Solids on Membrane Fouling During Short and long-term Operation of Membrane Bioreactor

2015 ◽  
Vol 11 (21) ◽  
pp. 137-155 ◽  
Author(s):  
Edson Baltazar Estrada-Arriaga ◽  
Petia Mijaylova Nacheva ◽  
Liliana García-Sánchez
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Membrane Surface ◽  
Waste Water Treatment ◽  
Critical Flux ◽  
Term Operation ◽  
Mixed Liquor ◽  
Submerged Membrane Bioreactor ◽  
The Impact

The aim of this study was to examine the impact of different Mixed Liquor Volatile Suspended Solids (MLVSS) concentrations on membrane fouling,in a submerged Membrane Bioreactor (MBR) at short and longterm MBRoperation for waste water treatment. Three laboratory-scale in a submerged MBR system were operated under critical flux, subcritical flux,and an intermittent suction time and backwashing conditions. At short-term MBR operation with mixed liquors of 4,200 and 6,150 mg MLVSSL−1, the hydraulic resistance of membranes followed a same trajectory with averages of 5.0E+12m−1, whereas for 7,940 mg MLVSSL−1, a highresistance of up to 1.7E+13m−1was obtained. The result showed thathigh biomass concentrations decreased to permeability due to a bio-layer formed in the membrane surface and high Extracellular Polymeric Substance (EPS).

An improved flux-step method to determine the critical flux and the critical flux for irreversibility in a membrane bioreactor

2009 ◽  
Vol 332 (1-2) ◽  
pp. 24-29 ◽  
Author(s):  
Perry van der Marel ◽  
Arie Zwijnenburg ◽  
Antoine Kemperman ◽  
Matthias Wessling ◽  
Hardy Temmink ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
Step Method ◽  
Critical Flux

Pilot study on municipal wastewater treatment by a modified submerged membrane bioreactor

2006 ◽  
Vol 53 (9) ◽  
pp. 103-110 ◽  
Author(s):  
Chunhai Wei ◽  
Xia Huang ◽  
Xianghua Wen
Keyword(s):  
Flow Rate ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Air Flow ◽  
Air Flow Rate ◽  
Critical Flux ◽  
Submerged Membrane Bioreactor ◽  
Aeration Intensity ◽  
N Removal

A pilot-scale modified submerged membrane bioreactor (SMBR) with the capacity of 18.1 m3d−1 was developed on the basis of the principle of air-lift internal-loop reactor. Economical aeration intensity of the SMBR was determined as 96 m3m−2h−1 according to hydrodynamic investigation. Corresponding economical air-flow rate was selected as the working air-flow rate in the long-term run. Under economical aeration intensity, the critical flux zone of the modified SMBR was as high as 30–35 Lm−2h−1 when MLSS was less than 13 gL−1. Therefore, a sub-critical flux of 30 Lm−2h−1 was selected as the working membrane flux in the long-term run. Membrane fouling was effectively controlled by sub-critical flux operation and periodic on-line chemical cleaning in the long-term run. When the average influent CODCr, NH3-N and turbidity were 310 and 44.3 mgL−1 and 161 NTU, respectively, the average permeate were 38.5 and 19.5 mgL−1 and 0.96 NTU under hydraulic retention time (HRT) was only 2.8 h. Corresponding removal was 86, 58.2 and 99.4%. DO deficiency caused by high MLSS was demonstrated as the main reason for low NH3-N removal.

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