A Novel Liner Desing to Prevent Groundwater Pollution


Gökalp Z. , Taş İ., Uzun O. , Şahan S. , Kaplan S. , Başaran M.

Journal of Agriculture Faculty of Gaziosmanpasa University, cilt.34, ss.122-131, 2017 (Hakemli Üniversite Dergisi)

  • Cilt numarası: 34
  • Basım Tarihi: 2017
  • Doi Numarası: 10.13002/jafag4414
  • Dergi Adı: Journal of Agriculture Faculty of Gaziosmanpasa University
  • Sayfa Sayıları: ss.122-131

Özet

In this research, study, a novel liner design was proposed for waste repository sites, constructed wetland basins and manure management lagoons to prevent the groundwater contamination by seepages from the bottom 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 proposed mixtures for liner design. With regard to heavy metal adsorption, bentonite had the best performance. Sand and pumice exhibited similar performances in lead and cadmium adsorption, but pumice had much better performance than sand in chrome, copper and nickel adsorption. Although sand-bentonite and pumice-bentonite mixtures exhibited similar performance in nitrate adsorption, again pumice-bentonite mixtures had much better performance than sand-bentonite mixtures in phosphorus adsorption. Current results revealed that pumice with macro-micro pore structure and resultant adsorption surface characteristics could be used as an alternative of sand in liner design.