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.

Removal of natural organic matter using surfactant-modified iron oxide-coated sand

2010 ◽  
Vol 174 (1-3) ◽  
pp. 567-572 ◽  
Author(s):  
Chunli Ding ◽  
Xin Yang ◽  
Wei Liu ◽  
Yujung Chang ◽  
Chii Shang
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Natural Organic Matter ◽  
Coated Sand

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.

AGGREGATION AND SURFACE PROPERTIES OF IRON OXIDE NANOPARTICLES: INFLUENCE OF pH AND NATURAL ORGANIC MATTER

2008 ◽  
Vol 27 (9) ◽  
pp. 1875 ◽  
Author(s):  
Mohammed Baalousha ◽  
Adriana Manciulea ◽  
Susan Cumberland ◽  
Kevin Kendall ◽  
Jamie R. Lead
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Surface Properties ◽  
Iron Oxide Nanoparticles ◽  
Natural Organic Matter ◽  
Oxide Nanoparticles ◽  
Influence Of Ph

scholarly journals Natural organic matter removal by ion exchange at different positions in the drinking water treatment lane

2013 ◽  
Vol 6 (1) ◽  
pp. 1-10 ◽  
Author(s):  
A. Grefte ◽  
M. Dignum ◽  
E. R. Cornelissen ◽  
L. C. Rietveld
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Biological Stability ◽  
Sand Filtration ◽  
Slow Sand Filtration

Abstract. To guarantee a good water quality at the customers tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research was to improve the biological stability of the produced water by incorporating anion exchange (IEX) for NOM removal. Different placement positions of IEX in the treatment lane (IEX positioned before coagulation, before ozonation or after slow sand filtration) and two IEX configurations (MIEX® and fluidized IEX (FIX)) were compared on water quality as well as costs. For this purpose the pre-treatment plant at Loenderveen and production plant Weesperkarspel of Waternet were used as a case study. Both, MIEX® and FIX were able to remove NOM (mainly the HS fraction) to a high extent. NOM removal can be done efficiently before ozonation and after slow sand filtration. The biological stability, in terms of assimilable organic carbon, biofilm formation rate and dissolved organic carbon, was improved by incorporating IEX for NOM removal. The operational costs were assumed to be directly dependent of the NOM removal rate and determined the difference between the IEX positions. The total costs for IEX for the three positions were approximately equal (0.0631 € m−3), however the savings on following treatment processes caused a cost reduction for the IEX positions before coagulation and before ozonation compared to IEX positioned after slow sand filtration. IEX positioned before ozonation was most cost effective and improved the biological stability of the treated water.

scholarly journals Self forming dynamic membrane filtration for drinking water treatment

2021 ◽  
Author(s):  
Suna Ozden Celik ◽  
Nese Tufekci ◽  
Ismail Koyuncu
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Natural Water ◽  
Membrane Filtration ◽  
Drinking Water Treatment ◽  
Limit Values ◽  
Remarkable Effect ◽  
Alternative Treatment Option ◽  
Dynamic Membranes ◽  
Synthetic Water

Abstract Lab-scale continuous operation of self forming MF and UF dynamic membranes were investigated simultaneously by applying iron oxide as an alternative treatment option in those waters having natural organic matter (NOM), iron and manganese. Both dynamic membranes gave high removal rates and effluent concentrations of pollutants were below the limit values in synthetic water. 60–62% of DOC and 75–78% of UV254 were removed in low DOC synthetic water (LS) by MF and UF dynamic membranes, respectively. Although only 42–49% of DOC and 48–53% of UV254 could be removed by MF and UF dynamic membranes, remarkable effect on fouling alleviation was observed in high DOC synthetic water (HS). Iron oxide did not enhance the removal of organic matter in low DOC natural water (LN) as much as it did in synthetic water. Iron oxide led to the removal of high molecular weight organics, thus reversible fouling reduced almost 2 orders of magnitude through both types of dynamic membranes in high DOC natural water (HN). Reversible and ireversibe resistances were reduced by iron oxide to some extent in LN. Nevertheless the effect of iron oxide on fouling alleviation was much higher in HN than LN.

Adsorptive Removal of Natural Organic Matter during Drinking Water Treatment

1999 ◽  
Vol 40 (9) ◽  
pp. 183-190 ◽  
Author(s):  
S. G. J. Heijman ◽  
A. M. van Paassen ◽  
W. G. J. van der Meer ◽  
R. Hopman
Keyword(s):  
Organic Matter ◽  
Ion Exchange ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Drinking Water Treatment ◽  
Ion Exchange Resin ◽  
Batch Experiments ◽  
Colour Removal ◽  
Adsorptive Removal ◽  
First Choice

For the removal of DOC (and colour) several treatment steps are suggested. If it is also necessary to remove hardness nanofiltration is probably the first choice. For colour removal without softening a number of adsorbents are suggested in the literature. In order to estimate the costs of these treatment steps a dynamic column model based on batch experiments was used to predict the service time of the columns filled with different adsorbents. Also the (on site) regeneration of the different adsorbents was investigated in batch experiments. Especially the ion exchange resin was very promising. The costs of the treatment of one m3 water with a column filled with an ion exchange resin was estimated for the investigated case at 0.05 Euro.

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