Removal of natural organic matter using iron oxide-coated membrane systems

2004 ◽  
Vol 4 (5-6) ◽  
pp. 207-213 ◽  
Author(s):  
K.-H. Choo ◽  
I.-H. Park ◽  
S.-J. Choi
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Close Association ◽  
Membrane Surface ◽  
Oxide Particle ◽  
Drinking Water Treatment ◽  
Iron Oxide Particle ◽  
Membrane Performance

Natural organic matter (NOM) removal and membrane fouling were investigated using iron oxide-coated microfiltration (MF) systems for drinking water treatment. Addition of iron oxide particle (IOP) adsorbents into MF always improved NOM removal and reduced fouling, but IOP dosing methods did affect the membrane performance. The IOP coating layer formed on the membrane surface played a major role in preventing membrane fouling by residual NOM in water. Pre-mixing of IOP with raw water followed by continuous injection into the MF system controlled membrane fouling better than pre- and intermittent loadings of IOP. This could be in close association with the distribution of IOPs across the hollow fiber MF surfaces and the effectiveness of contact of IOP with feedwater. The turbidity of water influenced the MF system with intermittent IOP loads more greatly than that with IOP in suspension. There existed an optimal IOP dose where membrane fouling can be minimized achieving maximal NOM removal.

Development of an integrated iron oxide adsorption/membrane separation system for water treatment

2002 ◽  
Vol 2 (5-6) ◽  
pp. 293-300 ◽  
Author(s):  
K.-W. Lee ◽  
K.-H. Choo ◽  
S.-J. Choi ◽  
K. Yamamoto
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Natural Organic Matter ◽  
Oxide Particle ◽  
Iron Oxide Particle ◽  
Drinking Water Source ◽  
Raw Water ◽  
Permeate Flux ◽  
Flux Decline ◽  
Dissolved Matter

The performance of an integrated iron oxide particle (IOPs) adsorption and ultrafiltration (UF) process was investigated in terms of natural organic matter removal and membrane permeability during treatment of a drinking water source. Throughout the fractionation of raw water and subsequent UF of fractioned portions, the significance of each component in raw water affecting flux decline during IOP-UF was evaluated. Natural organic matter (NOM) removal efficiencies for the IOP-UF system increased markedly as a substantial amount of IOPs was added into suspension, without any negative effect on permeate flux. During IOP-UF testings, there was no difference in NOM removal regardless of the locations of IOPs whether they were either in suspension or deposited on the UF membrane, but significant initial flux reduction occurred with the formation of a precoat (attached) layer. However, all IOPs in suspension and in the cake were effective in both removing NOM and preventing irreversible fouling as long as they were removed by backwashing. Dissolved matter obtained from filtration through a 0.45 μm filter was more responsible for flux decline in UF than larger colloids. Particularly, IOP-adsorbable dissolved matter accounted for 60% of total flux decline, confirming the attractiveness of IOP addition to UF.

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.

scholarly journals Influential Mechanism of Natural Organic Matters with Calcium Ion on the Anion Exchange Membrane Fouling Behavior via xDLVO Theory

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 968
Author(s):  
Zhun Ma ◽  
Lu Zhang ◽  
Ying Liu ◽  
Xiaosheng Ji ◽  
Yuting Xu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Interaction Energy ◽  
Anion Exchange ◽  
Natural Organic Matter ◽  
Calcium Ions ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Anion Exchange Membrane ◽  
Anion Exchange Membranes ◽  
Exchange Membrane

The fouling mechanism of the anion exchange membrane (AEM) induced by natural organic matter (NOM) in the absence and presence of calcium ions was systematically investigated via the extended Derjaguin–Landau–Verwey–Overbeek (xDLVO) approach. Sodium alginate (SA), humic acid (HA), and bovine serum albumin (BSA) were utilized as model NOM fractions. The results indicated that the presence of calcium ions tremendously aggravated the NOM fouling on the anion exchange membrane because of Ca-NOM complex formation. Furthermore, analysis of the interaction energy between the membrane surface and foulants via xDLVO revealed that short-range acid–base (AB) interaction energy played a significant role in the compositions of interaction energy during the electrodialysis (ED) process. The influence of NOM fractions in the presence of calcium ions on membrane fouling followed the order: SA > BSA > HA. This study demonstrated that the interaction energy was a dominating indicator for evaluating the tendency of anion exchange membranes fouling by natural organic matter.

Investigation of membrane fouling by synthetic and natural particles

2004 ◽  
Vol 50 (12) ◽  
pp. 279-285 ◽  
Author(s):  
J.H. Kweon ◽  
D.F. Lawler
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Research Articles ◽  
Clay Material ◽  
Dramatic Effect ◽  
Flux Decline ◽  
Scanning Electron

The biggest impediment for applying membrane processes is fouling that comes from mass flux (such as particle and organic matter) to the membrane surface and its pores. Numerous research articles have indicated that either particles or natural organic matter (NOM) has been the most detrimental foulant. Therefore, the role of particles in membrane fouling was investigated with two synthetic waters (having either particles alone or particles with simple organic matter) and a natural water. Membrane fouling was evaluated with flux decline behavior and direct images from scanning electron microscopy. The results showed that the combined fouling by kaolin and dextran (a simple organic compound selected as a surrogate for NOM) showed no difference from the fouling with only the organic matter. The similarity might stem from the fact that dextran (i.e., polysaccharide) has no ability to be adsorbed on the clay material, so that the polysaccharide behaves the same with respect to the membrane with or without clay material being present. In contrast to kaolin, the natural particles showed a dramatic effect on membrane fouling.

scholarly journals The Combination of Coagulation and Adsorption for Controlling Ultra-Filtration Membrane Fouling in Water Treatment

Water ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 90 ◽  
Author(s):  
Fan Bu ◽  
Baoyu Gao ◽  
Qinyan Yue ◽  
Caiyu Liu ◽  
Wenyu Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Filtration Membrane ◽  
Cake Layer ◽  
Ultra Filtration ◽  
The Impact ◽  
Filtration Technology

Ultra-filtration technology has been increasingly used in drinking water treatment due to improvements in membrane performance and lowering of costs. However, membrane fouling is the main limitation in the application of ultra-filtration technology. In this study, we investigated the impact of four different pre-treatments: Coagulation, adsorption, coagulation followed by adsorption (C-A), and simultaneous coagulation and adsorption (C+A), on membrane fouling and natural organic matter removal efficiency. The results showed that adsorption process required a large amount of adsorbent and formed a dense cake layer on the membrane surface leading to severe membrane fouling. Compared to adsorption alone, the coagulation and C-A processes decreased the transmembrane pressure by 4.9 kPa. It was due to less accumulation of particles on the membrane surface. As for water quality, the C-A ultra-filtration process achieved the highest removal efficiencies of natural organic matter and disinfection by-product precursors. Therefore, the addition of adsorbent after coagulation is a potentially important approach for alleviating ultra-filtration membrane fouling and enhancing treatment performance.

Aqueous natural organic matter removal by quaternary-ammonium-compound-modified iron-oxide-coated sand

2008 ◽  
Vol 8 (5) ◽  
pp. 565-571
Author(s):  
Chunli Ding ◽  
Chii Shang ◽  
Yujung Chang
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Natural Organic Matter ◽  
Quaternary Ammonium ◽  
Drinking Water Treatment ◽  
Hexadecyltrimethylammonium Bromide ◽  
Ammonium Compound ◽  
Coated Sand ◽  
Positive Effect ◽  
Long Chain

In this study, modification of iron-oxide-coated sand (IOCS) with three quaternary ammonium compounds (QACs) was tested as a means to improve the removal of aqueous natural organic matter (NOM) by IOCS. The assessment was conducted in batch, isotherm setup with changes in types and concentrations of QACs, modification pH, additions of H2O2 during modification, and adsorption pH. IOCS modification with long chain QACs, including hexadecyltrimethylammonium bromide (HDTMA) and hexadecylbenzyldimethylammonium chloride (HDBDMA) significantly increased the adsorption of NOM, while coating IOCS with short chain QAC, tetrapropylammonium chloride (TPA) had no positive effect. The enhancement increased with increasing pH and increasing QAC concentration used during modification. Co-additions of long chain QACs with H2O2 during modification could further improve NOM adsorption. Modification of IOCS with 10.0 mM HDTMA at pH 9.9 with the 0.2% H2O2 addition doubled NOM adsorption capacity on IOCS at pH 9.1. The results presented here suggest that the modification of IOCS using long chain QACs can enhance NOM removal by IOCS during drinking water treatment.

scholarly journals Effects of a Novel Adsorbent on Membrane Fouling by Natural Organic Matter in Drinking Water Treatment

Membranes ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 151 ◽  
Author(s):  
Lelum Manamperuma ◽  
Eilen Vik ◽  
Mark Benjamin ◽  
Zhenxiao Cai ◽  
Jostein Skjefstad
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Water Source ◽  
Packed Bed ◽  
Transmembrane Pressure

Irreversible fouling of water filtration membranes reduces filter longevity and results in higher costs associated with membrane maintenance and premature replacement. The search for effective pretreatment methods to remove foulants that tend to irreversibly foul membranes is ongoing. In this study, a novel adsorbent (Heated Aluminum Oxide Particles (HAOPs)) was deployed in a fully automated pilot system to remove natural organic matter (NOM) from the surface water source used at the UniVann water treatment plant (WTP) in Ullensaker County, Norway. The pilot plant treatment process consists of passing the water through a thin layer of HAOPs that has been deposited on a mesh support. The HAOPs layer acts as an active packed bed which removes NOM from the water. Fluxes around 120 L/m2/h (LMH) at transmembrane pressure (TMP) below 10.7 psi (0.7 bar) were achieved over production cycles excessing 12 h. Treatment achieved always >85% colour removal and effluent colour <5 mg Pt/L (the target of treatment), and always <0.01 NTU turbidity and non-detectable suspended solids in the permeate. The HAOPs mixture after saturated with NOM is easy to remove by disruption of the HAOPs by rinsing the mesh surface, and the sludge is easily dewatered to higher of dry solids content.

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