Your search found 2 records
1 Silva Atapattu, Sithara. 2006. The transformation of the shallow water coral communities of Hikkaduwa, Sri Lanka following temperature anomalies in 1998. Pakistan Journal of Oceanography, 2(1):23-40.
(Location: IWMI-HQ Call no: IWMI 578.7789 G744 SIL Record No: H039752)
2 Soda, W.; Noble, Andrew D.; Suzuki, S.; Simmons, R.; Sindhusen, L.; Bhuthorndharaj, S. 2005. The co-composting of waste bentonites from the processing of vegetable oil and its affect on selected soil properties of a light textured sand. In International Union of Soil Sciences (IUSS); Institut de Recherche pour le Developpement (IRD); Thailand. Land Development Department (LDD); International Water Management Institute (IWMI); FAO. Regional Office for Asia and the Pacific (FAO RAP); Khon Kaen University. Faculty of Agriculture. Management of tropical sandy soils for sustainable agriculture: a holistic approach for sustainable development of problem soils in the tropics. Proceedings of the First Symposium on Management of Tropical Sandy Soils for Sustainable Ariculture, Khon Kaen, Thailand, 27 November – 2 December 2005. Bangkok, Thailand: FAO Regional Office for Asia and the Pacific (FAO RAP). pp.204-214.
Composting ; Bentonite ; Plant oils ; Waste treatment ; Bleaching ; Litter for animals ; Rice husks ; Soil properties ; Soil chemicophysical properties ; Acidity ; Porosity ; Pot experimentation / Thailand / Bangkok
(Location: IWMI HQ Call no: 630 G000 INT Record No: H047327)
(0.59 MB) (16.9 MB)
Waste acid bentonite is a byproduct from vegetable oil bleaching that is both acidic (pH <3.0) and water repellent (hydrophobic). These materials are currently disposed in landfills and are an environmental hazard due to the aforementioned properties. A study was undertaken using three different sources of waste oil bentonites collected from processing plants within the Bangkok metropolitan area. These wastes included soybean oil bentonite (SB), palm oil bentonite (PB) and rice bran oil bentonite (RB), each of which was co-composted with rice husk, rice husk ash, and chicken litter in order to eliminate their acid reactivity and hydrophobic nature. The chemical and physical characteristics of acid activated bentonites before and after bleaching and the co-composted materials after addition to a degraded light textured soil were assessed and are reported herein. The organic carbon (OC) content, pH, exchangeable cations and cation exchange capacity (CEC) of the waste oil bentonites increased significantly after the co-composting phase. In addition, the hydrophobic nature of these materials as measured using the Water Drop Penetration Test (WDPT) decreased from 10,800 seconds to 16-80 seconds after composting. Furthermore, when these composted materials were incorporated into a degraded light textured sandy soil positive impacts to soil physical attributes in terms of specific surface area, total porosity and available water content for crop growth were observed. The results from this study demonstrate the positive impact of the waste products when modified through composting on the physical and chemical properties of a light textured sandy soil.
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