Performance of ultrafiltration membrane process combined with coagulation/sedimentation

2005 ◽  
Vol 51 (6-7) ◽  
pp. 209-219 ◽  
Author(s):  
N.-Y. Jang ◽  
Y. Watanabe ◽  
S. Minegishi
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Removal Efficiency ◽  
Membrane Fouling ◽  
Pilot Plant ◽  
Membrane Filtration ◽  
Operating Pressure ◽  
Membrane Process ◽  
Bench Scale ◽  
Jar Test

Effects of coagulation/sedimentation as a pre-treatment on the dead-end ultrafiltration (UF) membrane process were studied in terms of membrane fouling and removal efficiency of natural dissolved organic matter, using Chitose River water. Two types of experiment were carried out. One was a bench scale membrane filtration with jar-test and the other was membrane filtration pilot plant combined with the Jet Mixed Separator (JMS) as a pre-coagulation/sedimentation unit. In the bench scale experiment, the effects of coagulant dosage, pH and membrane operating pressure on the membrane fouling and removal efficiency of natural dissolved organic matter were investigated. In the pilot plant experiment, we also investigated the effect of pre-coagulation/sedimentation on the membrane fouling and the removal efficiency of natural dissolved organic matter. Coagulation/sedimentation prior to membrane filtration process controlled the membrane fouling and increased the removal efficiency of natural dissolved organic matter.

Application of MIEX® pre-treatment for ultrafiltration membrane process for NOM removal and fouling reduction

2005 ◽  
Vol 5 (5) ◽  
pp. 15-24 ◽  
Author(s):  
H.J. Son ◽  
Y.D. Hwang ◽  
J.S. Roh ◽  
K.W. Ji ◽  
P.S. Sin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Removal Efficiency ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Reduction Rate ◽  
Chemical Characteristics ◽  
Permeate Flux ◽  
Physical Chemical ◽  
Sample Water ◽  
Original Water

In this study, pretreatment of organic matters with MIEX® was evaluated using bench-scale experimental procedures on three organic matters to determine its effect on subsequent UF or MF membrane filtration. For comparison, a coagulation process was also used as a pretreatment of UF or MF membrane filtration. Moreover, the membrane fouling potential was identified using different fractions and molecular weights (MW) of organic matter. From the removal property of MW organic matter by the coagulation process for the sample water NOM and AOM, the removal efficiencies of high MW organic matter were much higher than those of low MW organic matter. It was shown that the removal efficiency of high MW organic matter (more than 10 kDa) was lower than that of low MW organic matter for the MIEX® process. For the change of permeate flux by the pretreatment process, the MIEX®-UF process showed high removal efficiency of organic matter compared with the coagulation-UF processes, but a high reduction rate of permeate flux was presented through the reduction of removal efficiency of high MW organic matter. From sequential filtration test results to examine the effect of MW of organic matter on membrane fouling, we found that the membrane fouling occurred with high MW organic matter, and the DOC of organic matter less than 0.5 mg/L was acting as the membrane foulant. In sample water composed of low MW organic matter (less than 10 kDa), because the low MW organic matter of less than 10 kDa has a high removal efficiency by MIEX®, a low reduction rate of permeate flux is obtained compared with the coagulation-UF processes. In summary, research on the physical/chemical characteristics of original water is needed before a membrane pretreatment process is selected, and a pertinent pretreatment process should be used based on the physical/chemical characteristics of the original water.

Coagulation/flocculation/ultrafiltration for natural organic matter removal in drinking water production

2004 ◽  
Vol 4 (5-6) ◽  
pp. 215-222 ◽  
Author(s):  
A.R. Costa ◽  
M.N. de Pinho
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Water Production ◽  
Cellulose Acetate Membranes ◽  
Wide Range ◽  
Drinking Water Production

Membrane fouling by natural organic matter (NOM), namely by humic substances (HS), is a major problem in water treatment for drinking water production using membrane processes. Membrane fouling is dependent on membrane morphology like pore size and on water characteristics namely NOM nature. This work addresses the evaluation of the efficiency of ultrafiltration (UF) and Coagulation/Flocculation/UF performance in terms of permeation fluxes and HS removal, of the water from Tagus River (Valada). The operation of coagulation with chitosan was evaluated as a pretreatment for minimization of membrane fouling. UF experiments were carried out in flat cells of 13.2×10−4 m2 of membrane surface area and at transmembrane pressures from 1 to 4 bar. Five cellulose acetate membranes were laboratory made to cover a wide range of molecular weight cut-off (MWCO): 2,300, 11,000, 28,000, 60,000 and 75,000 Da. Severe fouling is observed for the membranes with the highest cut-off. In the permeation experiments of raw water, coagulation prior to membrane filtration led to a significant improvement of the permeation performance of the membranes with the highest MWCO due to the particles and colloidal matter removal.

Removal efficiency of dissolved organic matter from secondary effluent by coagulation-flocculation processes

2020 ◽  
pp. 1-10
Author(s):  
Natália Rodrigues Guimarães ◽  
Fabiane Dörr ◽  
Rodrigo de Oliveira Marques ◽  
Ernani Pinto ◽  
Sidney Seckler Ferreira Filho
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Removal Efficiency ◽  
Secondary Effluent

Evaluating membrane fouling potentials of dissolved organic matter in brackish water

2019 ◽  
Vol 149 ◽  
pp. 65-73 ◽  
Author(s):  
Sanghun Park ◽  
Taewoo Nam ◽  
Jeongyeop You ◽  
Eun-Sik Kim ◽  
Ilhwan Choi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Brackish Water ◽  
Membrane Fouling

Effect of Two Stages Adsorption as Pre-Treatment of Natural Organic Matter Removal in Ultrafiltration Process for Peat Water Treatment

2020 ◽  
Vol 988 ◽  
pp. 114-121 ◽  
Author(s):  
Mahmud ◽  
Muthia Elma ◽  
Erdina Lulu Atika Rampun ◽  
Aulia Rahma ◽  
Amalia Enggar Pratiwi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Optimum Dose ◽  
Operating Pressure ◽  
Filtration Process ◽  
Dead End ◽  
Ultra Filtration ◽  
Pre Treatment ◽  
Two Stages

Natural Organic Matter (NOM) content in peat water is a major problem of membrane fouling in ultrafiltration (UF). For that, two stages adsorption as pre-treatment was employed to minimize the membrane fouling of NOM content. This research was carried out to investigate the effect of two stages adsorption on ultrafiltration performance for NOM removal that remains in peat water. This method was using powdered activated carbon (PAC) dosage of 80, 160, 240, 320, 400, 480, 560, 640, 720, 800, 880 dan 960 mg.L-1. Then, Polysulfone (Psf) material was employed for Ultra filtration process. Membrane was applied in a dead-end mode with various operating pressure (1; 1.5; 2; 2.5; 3 bar). As a results, the optimum dose of PAC was 800 mg L-1 with dosage ratio of 3/4:1/4. Two stages adsorption-UF PSf provided the range from 86.9 to 92.8% of KMnO4 and 74.1-88.1% of UV254. For the experimental condition of 3 bar, the highest flux was achieved up to 39.919 L h-1.m-2.

scholarly journals Effects of mass retention of dissolved organic matter and membrane pore size on membrane fouling and flux decline

2009 ◽  
Vol 43 (2) ◽  
pp. 389-394 ◽  
Author(s):  
Cheng-Fang Lin ◽  
Angela Yu-Chen Lin ◽  
Panchangam Sri Chandana ◽  
Chao-Yuan Tsai
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Pore Size ◽  
Membrane Fouling ◽  
Membrane Pore ◽  
Flux Decline ◽  
Membrane Pore Size

Characteristic of algogenic organic matter and its effect on UF membrane fouling

2011 ◽  
Vol 64 (8) ◽  
pp. 1685-1691 ◽  
Author(s):  
T. Li ◽  
B. Z. Dong ◽  
Z. Liu ◽  
W. H. Chu
Keyword(s):  
Organic Matter ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Size Exclusion ◽  
Fluorescence Excitation ◽  
Membrane Pore ◽  
Blue Green Algae ◽  
Flux Decline ◽  
Exclusion Chromatography ◽  
Hydrophilic Compound

Algogenic organic matter (AOM) was extracted from blue-green algae (cyanobacteria) and its characteristic was determined by various methods including high-pressure size-exclusion chromatography (HP-SEC), hydrophobic and hydrophilic fractionation, molecular weight (MW) fractionation and fluorescence excitation emission matrix (EEM). The results revealed that AOM was hydrophilic fractionation predominantly, accounting for 78%. The specific ultraviolet absorbance of AOM was 1.1 L/(mg m) only. The analysis for MW distribution demonstrated that organic matter greater than 30,000 MW accounted for over 40% and was composed of mostly neutral hydrophilic compound. EEM analyses revealed that protein-like and humic-substances existed in AOM. A test for membrane filtration exhibited that AOM could make ultrafiltration membrane substantial flux decline, which can be attributed to membrane pore clog caused by neutral hydrophilic compound with larger MW.

Membrane fouling propensity after adsorption as pretreatment in rainwater: a detailed organic characterisation

2008 ◽  
Vol 58 (8) ◽  
pp. 1535-1539 ◽  
Author(s):  
L. Sabina ◽  
B. Kus ◽  
H.-K. Shon ◽  
J. Kandasamy
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Building Blocks ◽  
Fulvic Acids ◽  
Humic And Fulvic Acids ◽  
Removal Efficiencies ◽  
Hydrophilic Compounds ◽  
Hydrophobic Fraction

Organic characterisation in rainwater was investigated in terms of dissolved organic carbon (DOC) and molecular weight distribution (MWD) after powdered activated carbon (PAC) adsorption. PAC adsorption was used as pretreatment to membrane filtration to reduce membrane fouling. The MW of organic matter in rainwater used in this study was in the range of 43,000 Da to 30 Da. Each peak of organic matter consisted of biopolymers (polysaccharides and proteins), humic and fulvic acids, building blocks, low MW acids (hydrolysates of humic substances), low MW neutrals and amphiphilics. Rainwater contained the majority of hydrophilic compounds up to 72%. PAC adsorption removed 33% of total DOC. The removal efficiencies of the hydrophobic and hydrophilic fractions after PAC adsorption were 50% and 27%, respectively. PAC adsorption was found to preferentially remove the hydrophobic fraction. The majority of the smaller MW of 1,100 Da, 820 Da, 550 Da, 90 Da and 30 Da was removed after PAC adsorption. The MFI values decreased from 1,436 s/L2 to 147 s/L2 after PAC adsorption. It was concluded that PAC adsorption can be used as a pretreatment to membrane filtration with rainwater.

scholarly journals PENGARUH PROSES HIBRID KOAGULASI DUA TAHAP DAN MEMBRAN ULTRAFILTRASI POLISULFON TERHADAP PENYISIHAN BAHAN ORGANIK ALAMI AIR GAMBUT

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Raissa Rosadi ◽  
Mahmud Mahmud ◽  
Chairul Abdi
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Ultrafiltration Membrane ◽  
Hybrid Process ◽  
Optimum Dose ◽  
Two Stage ◽  
Optimum Pressure ◽  
Jar Test ◽  
Dead End

ABSTRAK Penyisihan kandungan bahan organik alami (BOA) pada air gambut dengan menggunakan membran ultrafiltrasi polisulfon mempunyai kendala berupa terjadinya fouling membran. Proses hibrid koagulasi satu tahap dan ultrafiltrasi diketahui hanya mampu menyisihkan kandungan BOA yang bersifat hidrofobik dan sebagian kandungan hidrofilik. Penggunaan koagulasi dua tahap diduga mampu mengurangi potensi fouling pada membran, serta lebih baik dalam menyisihkan kandungan BOA hidrofobik dan hidrofilik. Penelitian ini bertujuan untuk mendapatkan dosis dan tekanan optimum pada proses hibrid koagulasi dua tahap dan UF-PSf dalam menyisihkan kandungan BOA air gambut, serta mengetahui pengaruh praperlakuan koagulasi dua tahap terhadap perubahan nilai fluks pada membran UF-PSf. Proses koagulasi menggunakan alat jar test dengan koagulan Al2(SO4)3. Sistem filtrasi pada membran UF-PSf menggunakan sistem aliran dead-end. Kondisi operasi optimum pada proses hibrid koagulasi dua tahap dan UF-PSf didapatkan pada dosis 175 mg/L dan tekanan filtrasi 3 bar dengan besar penyisihan BOA zat organik KMnO4 dan UV254 berturut-turut sebesar 97,32% dan 96,02%%. Praperlakuan koagulasi dua tahap memberikan pengaruh terhadap nilai fluks yang semakin besar pada proses hibrid koagulasi dua tahap dan UF-PSf. Nilai fluks pada tekanan optimum 3 bar yaitu sebesar 154,84 L/m2.jam. Kata kunci:   Air gambut, bahan organik alami,  fouling membran, koagulasi dua tahap, membran ultrafiltrasi polisulfon. ABSTRACT  Removal of natural organic matter (NOM) on peat water by Polysulfone ultrafiltration membrane (UF-PSf) have some of promblem, namely membrane fouling. Hybrid process of one-stage coagulation and UF-PSf can remove hydrophobic and some hydrophilic content of NOM. Two stage coagulation was allegedly able to decrease membrane fouling, and better to remove hydrophobic and hydrophilic content of NOM. The purpose of this reseach is to find the optimum dose and pressure on two stage coagulation and UF-PSf hybrid process to remove NOM in peat water, and to known the effect of two stage coagulation pretreatment towards flux value changes on UF-PSf membranes. The coagulation process using jar test instrument with Al2(SO4)3 coagulant. The filtration system on the UF-PSf membrane using dead-end flow system. The optimum dose and pressure on hybrid process of two stage coagulation and UF-PSf is 175 mg/L and 3 bar with BOA removal of organic subtances KMnO4 and UV254 respectively amounted to 97,32% and 96,02%. Two stage coagulation pretreatment giving icreasing the flux value on two stage coagulation and UF-PSf hybrid process. The flux value of optimum pressure at 3 bar is 154,84L/m2.hours.  Keywords:    peat water, natural organic matter (NOM), fouling membrane, two stage coagulation,           polysulfone ultrafiltration membrane.

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