1.6 cm diameter. To enable a flow of 5 mL/min through the column the zeolite or zeolite composites were mixed with quartz sand at ratio of 1:18.3. Quartz sand was thoroughly washed in distilled water and dried at 105 °C for 24 h. Preliminary experiments showed no adsorp- tion of MTBE by the quartz sand and the glass columns. The MTBE solution was stored in and pumped from polypropylene sample bags of 10 L with Teflon tubing (SKC, USA) to avoid MTBE volatilization. The columns were filled with 44 g of sand mixed with 2.4 g of zeolite, zeo- lite composites, or with a layer of 2.4 g of GAC in the middle of the col- umn and the rest of the column filled with 44 g sand. The bottom of the columns was covered by 2 cm layer of quartz sand. Non woven polypropylene geo textile filters (Markham Culverts Ltd., Papua New Guinea) were placed on both ends of the column to prevent exit of the sand and the composites from the column. Prior to filtration the column was connected to a peristaltic pump and saturated by dis- tilled water from the bottom (2mL/min). A MTBE solution (1500 mL) was passed through the silicalite zeolite, zeolite compos- ites and GAC columns at a rate of 5 mL/min. The eluating water was collected for analysis. One pore volume was 10 or 14 mL for zeolite and zeolite composites, or GAC columns, respectively.
1.6 cm diameter. To enable a flow of 5 mL/min through the column the zeolite or zeolite composites were mixed with quartz sand at ratio of 1:18.3. Quartz sand was thoroughly washed in distilled water and dried at 105 °C for 24 h. Preliminary experiments showed no adsorp- tion of MTBE by the quartz sand and the glass columns. The MTBE solution was stored in and pumped from polypropylene sample bags of 10 L with Teflon tubing (SKC, USA) to avoid MTBE volatilization. The columns were filled with 44 g of sand mixed with 2.4 g of zeolite, zeo- lite composites, or with a layer of 2.4 g of GAC in the middle of the col- umn and the rest of the column filled with 44 g sand. The bottom of the columns was covered by 2 cm layer of quartz sand. Non woven polypropylene geo textile filters (Markham Culverts Ltd., Papua New Guinea) were placed on both ends of the column to prevent exit of the sand and the composites from the column. Prior to filtration the column was connected to a peristaltic pump and saturated by dis- tilled water from the bottom (2mL/min). A MTBE solution (1500 mL) was passed through the silicalite zeolite, zeolite compos- ites and GAC columns at a rate of 5 mL/min. The eluating water was collected for analysis. One pore volume was 10 or 14 mL for zeolite and zeolite composites, or GAC columns, respectively.
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