scholarly journals Effects of various chemical cleaning conditions for pressured MF process

2016 ◽  
Vol 75 (5) ◽  
pp. 1063-1070
Author(s):  
Chang-Kyu Lee ◽  
Chansoo Park ◽  
June-Seok Choi ◽  
Jong-Oh Kim
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Pilot Scale ◽  
Second Step ◽  
Fiber Membrane ◽  
Bag Filter ◽  
Chemical Cleaning ◽  
Pilot Plant Process ◽  
The Impact ◽  
Plant Process

A pilot-scale pressured hollow-fiber microfiltration (MF) process as pretreatment for the reverse osmosis process was studied and operated under various conditions to assess the relative influence of backwashing, chemical enhanced backwashing (CEB), and bag filter application. The pilot plant process consisted of backwashing but without the CEB or the bag filter as the first step of the research. As the second step of the research, the impact of the backwashing on permeability recovery was assessed at different intervals followed by the influence of CEB on flowrate recovery. Results from operating the pilot-scale hollow-fiber membrane modules for more than 1 year have demonstrated that the appropriate pore size of bag filters was 25–50 μm and the optimized backwashing process was every 30 minutes with 25 mg/L of NaOCl, and CEB with an interval of 10 cycles with the use of 100 mg/L NaOCl.

Membrane biofouling behaviors at cold temperatures in pilot-scale hollow fiber membrane bioreactors with quorum quenching

Biofouling ◽  
2018 ◽  
Vol 34 (8) ◽  
pp. 912-924 ◽  
Author(s):  
Kibaek Lee ◽  
Jun-Seong Park ◽  
Tahir Iqbal ◽  
Chang Hyun Nahm ◽  
Pyung-Kyu Park ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Quorum Quenching ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Fiber Membrane ◽  
Cold Temperatures ◽  
Membrane Biofouling

A study on pilot-scale degassing by polypropylene (PP) hollow fiber membrane contactors

Desalination ◽  
2008 ◽  
Vol 234 (1-3) ◽  
pp. 316-322 ◽  
Author(s):  
Zan-Guo Peng ◽  
Swin-Hui Lee ◽  
Tong Zhou ◽  
Jyh-Jeng Shieh ◽  
Tai-Shung Chung
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Pilot Scale ◽  
Fiber Membrane ◽  
Membrane Contactors

Fouling in hollow fiber membrane microfilters used for household water treatment

2015 ◽  
Vol 5 (2) ◽  
pp. 220-228 ◽  
Author(s):  
Anna Murray ◽  
Mario Goeb ◽  
Barbara Stewart ◽  
Catherine Hopper ◽  
Jamin Peck ◽  
...  
Keyword(s):  
Water Treatment ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Hollow Fiber Membrane ◽  
Sterile Water ◽  
Fiber Membrane ◽  
Chemical Cleaning ◽  
Household Water Treatment ◽  
Household Water

The Sawyer PointOne hollow fiber membrane microfilter is promoted for household water treatment in developing countries. Critical limitations of membrane filtration are reversible and irreversible membrane fouling, managed by backwashing and chemical cleaning, respectively. The PointOne advertised lifespan is 10 years; users are instructed to backwash as maintenance. Owing to reduced turbidity and bacterial removal efficiencies, six PointOnes were removed from Honduran homes after 23 months of use. In the laboratory, we tested sterile water filtrate for turbidity and bacterial presence before and after backwashing and chemical cleaning. Sterile water filtrate from uncleaned filters had turbidity of 144–200 NTU and bacteria counts of 13–200 CFU. Cleaned filter effluent was positive for total coliforms. On one new and one used, cleaned filter, we imaged membranes with scanning electron microscopy and characterized surface elemental compositions with spectroscopy. Images and spectroscopy of the used, cleaned membrane revealed a dense, cake fouling layer consisting of inorganic metal oxides, organic material, and biofouling. Burst fibers were visually observed. This PointOne was thus irreversibly fouled and non-functional after <2 years of use. Further research is recommended to determine: impacts of source water quality on PointOne performance, a cleaning regimen to manage fouling, and an appropriate filter lifespan.

scholarly journals Numerical and experimental investigation for cleaning process of submerged outside-in hollow fiber membrane

2017 ◽  
Vol 76 (6) ◽  
pp. 1283-1299 ◽  
Author(s):  
Xingfei Guo ◽  
Yaowu Wang ◽  
Hongwei Zhang ◽  
Pengfei Li ◽  
Cong Ma
Keyword(s):  
Shear Stress ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Cfd Simulation ◽  
Hollow Fiber Membrane ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Membrane System ◽  
Fiber Membrane ◽  
The Impact

Membrane fouling has limited extensive applications for hollow fiber membranes in water treatment. Backwashing and air scouring can effectively solve this problem in the submerged outside-in hollow fiber membrane system. In this study, variation of the fouling layer on the membrane surface during backwashing and the impact of shear stress caused by air scouring on fouling removal were investigated through computational fluid dynamics (CFD) simulation. The backwashing and air scouring process were simulated using CFD and the results were verified by experimental studies. The results of experimental studies are in accordance with the simulation results. During the backwashing process, the velocity profile inside the reactor was presented, and visualization of the particle movement to illustrate the dynamic peeling process of the fouling layer on the membrane surface was also shown. The formation of uneven cleaning reveals that the upper region of the fibers has an excellent cleaning effect during backwashing. After that, the supporting role of air scouring was investigated in the study. It is concluded that the lower part and the middle region of the fibers suffer greater shear stress by analyzing the velocity contours and vectors, and the analysis results indicated that air scouring can further remove membrane fouling.

scholarly journals Gas-Liquid Hollow Fiber Membrane Contactors for Different Applications

Fibers ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 76 ◽  
Author(s):  
Stepan D. Bazhenov ◽  
Alexandr V. Bildyukevich ◽  
Alexey V. Volkov
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Pilot Scale ◽  
Fiber Membrane ◽  
Separation Processes ◽  
Research Activities ◽  
Wide Range ◽  
Hybrid Separation Processes ◽  
Separation Equipment ◽  
Membrane Contactors

Gas-liquid membrane contactors that were based on hollow fiber membranes are the example of highly effective hybrid separation processes in the field of membrane technology. Membranes provide a fixed and well-determined interface for gas/liquid mass transfer without dispensing one phase into another while their structure (hollow fiber) offers very large surface area per apparatus volume resulted in the compactness and modularity of separation equipment. In many cases, stated benefits are complemented with high separation selectivity typical for absorption technology. Since hollow fiber membrane contactors are agreed to be one of the most perspective methods for CO2 capture technologies, the major reviews are devoted to research activities within this field. This review is focused on the research works carried out so far on the applications of membrane contactors for other gas-liquid separation tasks, such as water deoxygenation/ozonation, air humidity control, ethylene/ethane separation, etc. A wide range of materials, membranes, and liquid solvents for membrane contactor processes are considered. Special attention is given to current studies on the capture of acid gases (H2S, SO2) from different mixtures. The examples of pilot-scale and semi-industrial implementation of membrane contactors are given.

A Pilot-Scale System for Carbon Molecular Sieve Hollow Fiber Membrane Manufacturing

2012 ◽  
Vol 36 (1) ◽  
pp. 53-61 ◽  
Author(s):  
O. Karvan ◽  
J. R. Johnson ◽  
P. J. Williams ◽  
W. J. Koros
Keyword(s):  
Hollow Fiber ◽  
Molecular Sieve ◽  
Hollow Fiber Membrane ◽  
Pilot Scale ◽  
Fiber Membrane ◽  
Carbon Molecular Sieve
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