期刊
SUSTAINABILITY
卷 14, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/su141912770
关键词
waste management; contact angle; hydrophobic; capillary barrier; zero-waste approach
资金
- Costa Rica Ministry of Science, Technology, and Telecommunications (MICITT) [CONICIT FI-044B-19]
- Vice-presidency of Research and Outreach at the Instituto Tecnologico de Costa Rica [1360045]
This study investigates the application of hydrophobic-coated sand as a hydrophobic capillary barrier. Synthetic sand was coated with fatty acids extracted from palm oil sludge, and various methods were used to evaluate its contact angle, water holding capacity, hydraulic conductivity, and effectiveness as a capillary barrier.
Hydrophobic-coated sand causes a reduction in infiltration, making it suitable for hydrophobic capillary barriers. Borosilicate glass waste was crushed into a synthetic sand 180 mu m average, and fatty acids (PFA) were extracted from palm oil sludge. The synthetic sand was coated with PFA using mixing (POS-M) and solvent-assisted (POS-S) methods with stearic-acid-coated sand (SA) as a standard at concentrations varying from 1 to 16 g/kg. Contact angle measurements were undertaken by applying the sessile drop method. The water holding capacity of POS-M and SA were determined, and hydraulic conductivity curves were estimated with the van Genuchten model. Finally, a qualitative assessment of POS-M's effectiveness as a capillary barrier was performed using a set of micro-tensiometers. Maximum contact angles for POS-M, POS-S, and SA were 119.73 degrees, 118.83 degrees, and 107.48 degrees, respectively, and the saturated hydraulic conductivity of hydrophobized sands showed an exponential change of minus 2. Saturated conditions above the capillary barrier and unsaturated underneath were observed. In conclusion, the results indicate that the zero-waste approach applied through the reuse of solid waste from glass and palm oil production can be a waste management alternative in the production of hydrophobic sands that can be used in hydrophobic capillary barrier applications.
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