Available online at www.sciencedirect.com
Energy Procedia 5 (2011) 985–990
IACEED2010
Comparison of three sorbents for organic pollutant removal in drinking water Liu Hanchao, Feng Suping*, Du Xiaolin, Zhang Nannan, Liu Yongli Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science a nd Engineering, Shandong University, Jinan, 250100, China
Abstract Removal effects of organic pollutants in drinking water by activated carbon, haydite and quartz sand were studied with the method of solid-phase extraction (SPE) and GC-M S analyzing in this study. There were 42 species organic pollutants in 11 categories detected in drinking water. The removal rates of total peak area of organic pollutants by activated carbon, haydite and quartz were 70.35%, 29.68% and 37.36%. Among all, activated carbon showed the best removal effect to most organic pollutants contents, and quartz sand to species. So if activated carbon - quartz sand combined processes were adopted, organic pollutants species and total peak area could be reduced simultaneously.
© 2011 Published by Elsevier Ltd. Open access under CC BY-NC-ND license. Selection and peer-review under responsibility of RIUDS Keywords: Dringking water, Organic pollutant, GC-MS, Adsorption
1. Introducti on The potential danger of o rganic pollutants to human body has caused a world-wide concern recently [13]. Contents and kinds of trace organic pollutants in drinking water are increasing which will threaten safety of drinking water [4]. POPs, wh ich is a pollutant in water brought by human, especially causes serious harms due to its poor biodegradability [5-6]. At present in the developed countries, drinking water is treated mainly by flocculat ion and chlorination disinfection [7]. But unfortunately, these processes have no effect on natural organic matter wh ich has low mo lecular weight or lo w content [8-10]. In addit ion, disinfection by-products after chlorination disinfection will cause a series of new problems [11-13]. Adsorption is widely used in contamination control in recent years due to its characteristics of low costs and easy to operate [14-16]. It is also suitable for drin king water safety field because it has unique advantages in trace organic pollutants removal with no secondary pollution [17]. In this study, XAD-4,
*Corresponding author. T el.: +86 0531 88362819; fax: +86 0531 88362819 E-mail address:
[email protected].
1876–6102 © 2011 Published by Elsevier Ltd. Open access under CC BY-NC-ND license. doi:10.1016/j.egypro.2011.03.174
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Liu Hanchao et al. / Energy Procedia 5 (2011) 985–990
XAD-7 accu mulat ion and GC/MS analy zing were used as method, and methanol – acetone mixed liquor instead of single solvent as extract solution. Co mposition and hazard of organic pollutants in drinking water were studied. Meanwhile, the organic pollutants absorption effects of three adsorbents, activated carbon, haydite and quartz sand, were compared and discussed. At last, some useful advices were raised. 2. Materials and methods 2.1. Equipment and materials Resin XAD-4 and XAD-7 A mberlite were supplied by Rohm and Haas of Gessate (MI). It is designed for organic co mpound removal fro m wastewaters. Methanol and acetone were distilled to treat resin and extract organic compounds accumulated by resin column. Other regents such as hydrochloric acid (HCl) and sodium sulphate (Na2 SO4 ) were AR grade. Activated carbon, haydite and quartz sand were washed by ultra pure water for several times, and then dried at 500ć 2.2. Experiment 2.2.1. Water sample collection Tap water was collected fro m Jinan in China. A barrel made of polyethylene with volu me of 25L was used to collect the water. Three adsorption column filled with activated carbon, haydite and quartz sand were p repared to remove organic pollutants in tap water. A ll of co lu mn had a filler volu me o f 2L. 20L collected tap water was pumped into colu mn by a peristaltic pump and the contact time was controlled in 1h [18]. In this experiment, we used sample 1, samp le 2 and sample 3 to represent water samples treated by activated carbon, haydite and quartz sand column respectively, corresponding to their raw water sample a, b and c. All water samples were adjust to pH
