scholarly journals The Correction of the Dimensionless Equation for the Mass Transfer Coefficient Estimation during the Membrane Modules Regeneration

2020 ◽  
Vol 7 (2) ◽  
pp. F24-F29
Author(s):  
S.V. Huliienko ◽  
Y.M. Korniienko ◽  
M.S. Metlina ◽  
I.Y. Tereshenko ◽  
V.S. Kaminskyi
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Membrane Separation ◽  
Permeate Flux ◽  
Dimensionless Equation ◽  
Number Variation ◽  
Process Operation ◽  
Membrane Modules ◽  
Spiral Wound

The cleaning or regeneration of fouled membrane modules is an essential procedure in the membrane equipment operation. Despite the development of some successful cleaning techniques, the predictions of the membrane separation process operation parameters after regeneration is still an unsolved problem. In our previous works, the attempt to develop the methodology of estimating the membrane productivity after the regeneration of the fouled spiral wound membrane modules by cleaning the subatmospheric pressure has been made. However, this methodology requires some improvement, including the correction of the dimensionless equation to calculate the mass transfer coefficient. In this work, a set of additional experiments was carried out, and the corrections of the mass transfer correlation were done using both new and previously obtained experimental data. As a result, the improved dimensionless equation was contained as Sh = 0.00045Re0.8Sc0.33(de/l). This equation is valid in the range of Reynolds number variation of 0.4–60.0 for the case of the regeneration of spiral wound modules and can be used for the prediction of the permeate flux after the regeneration procedure.

Effect of feed temperature on permeate flux and mass transfer coefficient in spiral-wound reverse osmosis systems

Desalination ◽  
2002 ◽  
Vol 144 (1-3) ◽  
pp. 367-372 ◽  
Author(s):  
Mattheus F.A. Goosen ◽  
Shyam S. Sablani ◽  
Salha S. Al-Maskari ◽  
Rashid H. Al-Belushi ◽  
Mark Wilf
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Reverse Osmosis ◽  
Permeate Flux ◽  
Feed Temperature ◽  
Spiral Wound

scholarly journals PENENTUAN KOEFISIEN TRANSFER MASSA EKSTRAKSI KALIUM DARI ABU BATANG PISANG

Konversi ◽  
2012 ◽  
Vol 1 (1) ◽  
pp. 39
Author(s):  
Primata Mardina ◽  
Ajang Gunawan ◽  
Muhammad Imam Nugraha
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Extraction Process ◽  
Effect Of Temperature ◽  
Average Error ◽  
Time Interval ◽  
Dimensionless Equation ◽  
The One ◽  
Increasing Temperature

 Abstrak-Kalium sebagai mineral alam bisa didapatkan dari batang pisang dengan cara ekstraksi padat-cair pada abu batang pisang menggunakan pelarut methanol. Penelitian ini bertujuan untuk mengetahui pengaruh suhu pada proses ekstraksi kalium dari abu batang pisang koefisien transfer massa proses tersebut. Proses ekstraksi ini dilakukan secara batch pada labu leher tiga yang dilengkapi dengan motor pengaduk, pendingin balik, termometer dan media pemanas. Abu batang pisang sebanyak 25 gram dan metanol 250 mL dimasukkan ke dalam labu leher tiga sebagai sampel. Ekstraksi dimulai dengan memanaskan sampel sampai suhu yang diinginkan, yaitu 30oC, 45 oC dan 60 oC, kemudian motor pengaduk dijalankan pada kecepatan yang telah ditentukan. Sampel diambil dalam selang waktu tertentu 0, 15, 30, 60, 120 180 dan 240 menit. Dari proses ekstraksi kalium dapat diketahui koefisien transfer massa. Hasil penelitian menunjukkan bahwa koefisien transfer massa semakin besar dengan semakin tinggi suhu operasi. Nilai koefisien transfer massa terbesar adalah 0,0235/menit pada suhu 60oC. Hubungan antara koefisien transfer massa dengan variabel-variabel yang mempengaruhinya dapat dinyatakan dengan persamaan dalam bentuk kelompok tak berdimensi sebagai berikut: Dengan ralat rata-rata 6,56 % Keywords: Ekstraksi, kalium, abu batang pisang,  Abstract-Potassium is the one of chemical compounds which can be extracted from ash of pseudo stem of banana by methanol solid-liquid extraction method. The experiment investigated the effect of temperature on mass transfer coefficient of potassium extraction process from ash of banana’s pseudo stem. This experiment conducted in a three necks flask which equipped with mechanical stirrer, condenser, thermometer and heating mantle. The sample was heated to desired temperature, 30oC, 45 oC and 60 oC. and maintained constant while reaction time. The reaction was timed as soon as the mechanical stirrer was turned on. Samples were drawn at specified time interval 0, 15, 30, 60, 120, 180 and 240 minutes. The result showed increasing temperature increased mass-transfer coefficient. The highest value of mass-transfer coefficient was 0,0235 /minute at 60oC.The correlation between mass transfer coefficient and investigated variables is shown in the dimensionless equation below: The average error is 6.56 % Keywords: Extraction, potassium, ash of banana’s pseudo stem.

Interactions Between Natural Organic Matter (NOM) and Membranes: Rejection and Fouling

1999 ◽  
Vol 40 (9) ◽  
pp. 131-139 ◽  
Author(s):  
Gary Amy ◽  
Jaeweon Cho
Keyword(s):  
Mass Transfer ◽  
Molecular Weight ◽  
Organic Matter ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Natural Organic Matter ◽  
Operating Conditions ◽  
Membrane Properties ◽  
Permeate Flux ◽  
Molecular Weight Cutoff

This work demonstrates that interactions between membranes and natural organic matter (NOM) include rejection by both steric and electrostatic exclusion, and fouling by adsorption. NOM rejection and fouling are influenced by both NOM characteristics (molecular weight, aromaticity/humic content, and charge) and membrane properties (molecular weight cutoff (MWCO), hydrophobicity, and charge) as well as hydrodynamic operating conditions represented by a f/k ratio (the ratio of permeate flux (f) to a diffusional back-transport mass transfer coefficient (k)).

Determination of mass transport characteristics for natural organic matter (NOM) in ultrafiltration (UF) and nanofiltration (NF) membranes

2002 ◽  
Vol 2 (2) ◽  
pp. 151-160 ◽  
Author(s):  
S. Lee ◽  
Y. Shim ◽  
In S. Kim ◽  
J. Sohn ◽  
S.K. Yim ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Organic Matter ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Natural Organic Matter ◽  
Membrane Surface ◽  
Operating Conditions ◽  
Permeate Flux ◽  
Solute Permeability ◽  
Cross Flow Filtration

This study is mainly concerned with establishing a reliable method of the quantitative analysis of natural organic matter (NOM) transport characteristics through ultrafiltration (UF) and nanofiltration (NF) membranes with molecular weight cutoffs of 8000 (GM) and 250 (ESNA), respectively. Filtrations were conducted with a cross-flow filtration unit and hydrodynamic operating conditions were controlled by a J0/k ratio (the ratio of initial permeate flux [J0] to a back diffusional mass transfer coefficient [k]). A four-parameter (the apparent mass transfer coefficient [ka], the solute concentration near the membrane surface [Cm], the solute permeability [Pm], and the reflection coefficient (σ) model based on concentration polarization and irreversible thermodynamics was used to manipulate experimental results quantitatively. With the values of the determined parameters, the transport characteristics of NOM due to different solution chemistries such as pH and ionic strength through UF/NF membrane pores were investigated. This model was also used to demonstrate the effects of NOM structure (hydrophobic/transphilic/hydrophilic) on transport through the membranes, with XAD-8/4 resins fractionation and isolation procedures. Four parameters estimated through the model were revealed to be relevant to elucidate the behaviors of NOM in membranes and corresponding transport-related results were in good agreement with the theoretical descriptions related to the interactions between NOM molecules and membrane surface/pores.

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