Removal of THM precursors by GAC: Ankara case study

Capar, G
Yetiş, Ülkü
The effectiveness of granular activated carbon (GAC) adsorption for the removal of natural organic matter and trihalomethanes from Ivedik Water Treatment Plant of Ankara City is investigated. Freundlich Isotherm constants K and n were determined as 17.61 and 1.66, respectively. Bench-scale GAC columns were run with empty bed contact times (EBCT) varying from 0.40 to 2.67 min to evaluate adsorption performance. 50% exhaustion values were used for comparison. The treated volumes of water increased with EBCT, showing a linear increase in GAC service life. Correspondingly, the carbon usage rate decreased. The capacities calculated by the isotherm equation and achieved by columns were also compared. The column capacities were within 43-65% of the isotherm capacities at complete breakthrough. However, they were only within 8-17% of the isotherm capacities at 50% breakthrough.


Removal of trihalomethane precursors by granular activated carbon treatment
CAPAR, Goksen; Demirer, Göksel Niyazi; Dilek, Filiz Bengü; Yetiş, Ülkü (2001-02-01)
This research covers the determination of the existing situation of trihalomethane (THM) levels in the distribution system of Ankara City and also focuses on the investigation of effectiveness of granular activated carbon (GAC) adsorption for the removal of natural organic matter (NOM) that are THM precursors and also THMs. For this purpose, a survey was carried out at 14 selected points in the city and the THMs were observed to be present in the Ivedik Water Treatment Plant (IWTP) filter effluent and in th...
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Biochar (BC), a low-cost, porous and carbon-rich material, exhibits excellent potential as an adsorbent in the immobilization and removal of environmental contaminants from water and soil. To enhance the surface area, functionalities and adsorption efficiency of BC, various clay and clay mineral-based physical and chemical modification methods have been adopted. Although extensive studies have been conducted to evaluate the removal efficiencies of BC-clays and clay minerals composites, insight into synthesi...
Citation Formats
G. Capar and Ü. Yetiş, “Removal of THM precursors by GAC: Ankara case study,” WATER RESEARCH, pp. 1379–1384, 2002, Accessed: 00, 2020. [Online]. Available: