Removal of Humic Substances

Humic substances (including humic add, fulvic acid, and humin) make up about 80% of soil organic matters in dark soils. Their presence in surface and groxmd water may produce toxic chemicals during disinfection 

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N. Masque R. M. Marce and E. Boirull, Chemical removal of humic substances interfering with the on-line solid-phase exti action-liquid chi omatographic determination of polar water pollutants , Chromatographia 4 231-236 (1998). 

Two 25-mL portions of saturated HCl/methanol. Used for the removal of humic substances. 

Teermann 1 P, Jekel M R (1999) Adsorption of humic substances onto p-FeOOH and its chemical regeneration. Conference Proceedings of the International IAWQ-1WSA Joint Specialist Conference on Removal of humic substances from water , 0degaard, H. (Ed.), Trondheim, Norway, 24.-26. June 1999 (Water, Science Technology, in press). 

A short column packed with an amine bonded polymer (weak anion exchange material) connected prior to the anion separation column was found to be very effective for the selective removal of humic substances prior to anion separation by ion chromatography. About 500 sample injections could be performed before breakthrough of humic substances occurred as indicated by ultraviolet measurements made on the eluate at 225nm. 

FIG. 22 Effect of porosity on the removal of humic substances by a series of carbon adsorbents (a) humic substances fractionated al pH = 2.8 (b) humic substances fractionated at pH = 6.8. (Adapted from Ref. 546.)... 

Odegaard and Koottatep (1982) report that higher-molecular-weight fractions are excluded well at low concentrations, but movement across the membrane occurs at higher concentrations. These authors report 80-100% removal of humic substances, as determined by color removal. However, reverse osmosis is an expensive, equipment-intensive method. 

Odegaard, H. and Koottatep, S. (1982). Removal of humic substances from natural waters by reverse osmosis. Water Res. 16, 613-620. 

Moriguchi, T. et al.. Metal-modified silica adsorbents for removal of humic substances in water, 7. Colloid Intetf. Sci., 283, 300, 2005. 

Amy G., Cho J. (1999), Interactions between natural organic matter (NOM) and membranes rejection and fouling, in Odegaard H. (Ed), Removal of humic substances from water. Conference Proceedings, Trondheim, Norway, 141-148. 

Thorson T, Krogh T., Bergan E. (1993), Removal of humic substances with membranes system, use and experiences, Proc. of AVWA Membrane Technology Conf, Baltimore, Aug 93,131-143. 

Fettig J. Removal of humic substances by adsorption/ion exchange. Water Science and Technology 1999 40(9) 173-182. 

Rajesh S, Senthilkumar S, Jayalakshmi A, Nir-mala MT, Ismail AF, Mohan D. Preparation and performance evaluation of poly (amide-imide) and Ti02 nanoparticles impregnated polysul-fone nanofiltration membranes in the removal of humic substances. Colloids Surf A Physico-chem Eng Aspects 2013 418 92-104. 

Removal of humic substances Nitrate ion removal Sulphate ion removal Selenium ion removal... 

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