Yeraltı Suyu Kirliliğini Önlemeye Dönük Bariyer Tasarımı

In this research, study, a novel liner design was p roposed for waste repository sites, constructed wetla nd basins and manure management lagoons to prevent the groundwater contamination by seepages from the bott om of these facilities. For this purpose, sand-bentonite and pumice-bentonite mixtures with pre-defined grain size range (1.00-0.50 mm) and bentonite content (30%) was used in experiments. Various concentrations of nitrate, phosphorus (25, 50, 100, 150 and 200 ppm) and heavy metals (Cd, Ni, Pb, Cr and Cu) solutions (10, 20, 30, 40 and 50 ppm) were used to saturate the permeability test samples. Extracts of permeability test were used to investigate the adsorption and desorption characteristics of pr posed mixtures for liner design. With regard to he avy metal adsorption, bentonite had the best performance. San d and pumice exhibited similar performances in lead an cadmium adsorption, but pumice had much better perf ormance than sand in chrome, copper and nickel adso rption. Although sand-bentonite and pumice-bentonite mixture s exhibited similar performance in nitrate adsorpti n, again pumice-bentonite mixtures had much better performan ce than sand-bentonite mixtures in phosphorus adsor ption. Current results revealed that pumice with macro-micr o pore structure and resultant adsorption surface characteristics could be used as an alternative of sand in liner design.