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Undergraduate Theses

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14583/13

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    Decomposition of sugarcane bagasse by Trichoderma
    Bangilan, Ma. Irish P. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1994-04)
    Sugarcane bagasse, an end-product after extraction of the juice of the sugarcane, was composted with the aid of Trichoderma, a compost fungus activator which shortens the decomposition process of farm wastes. Decomposition process was observed through the changes in temperature and substrate consistency. An average of 94 days was noted for a complete decomposition of 900 kg bagasse. Analysis of bagasse compost gave 0.78% nitrogen, 4.94% phosphorus, in the form of P2O5 and 1.55% potassium, in the form of K 2O. It showed that composted bagasse is a good source of phosporus but poor in nitrogen and potassium. The compost, nevertheless, can also be a good soil conditioner.
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    Optimization of pH, sorbent dose, and contact time in biosorption of Cu, Cd and Pb in sugarcane bagasse in a tri-metal aqueous system
    Abetria, Pauline Grace R. (Department of Chemistry, College of Arts and Sciences, Univsersity of the Philippines Visayas, 2013-04)
    Adsorption is one of the physicochemical treatment processes found to be effective in removing heavy metals from aqueous solutions. The biosorption of Cu, Cd, and Pb in sugarcane bagasse in a tri-metal aqueous system was optimized for pH, sorbent dose, and contact time using Doehlert design and it was found that the optimal values are pH 5, a sorbent dose of 1.33g sorbent/mg metal, a contact time of 4 hours, and the available sites on the sorbent for metal binding were influenced by pH. Furthermore, the effect of initial metal concentration on the metal uptake of the sorbent was also studied and it was found that at increasing metal concentrations the metal uptake also increased at a fixed (optimum) sorbent dose. The sorbent affinity was observed to be increasing in favor of increasing ionic radius, Cu < Cd < Pb, at relatively low metal concentrations and Cd < Cu < Pb at relatively high metal concentrations. Each metal behaved differently on the sorbent. Copper obeyed the Langmuir isotherm whereas cadmium and lead both obeyed the Freundlich isotherm. Finally, the IR spectrum of the sorbent was elucidated and -OH and -COOH groups were present but complexation was absent. Hence, in a tri-metal aqueous system containing Cu, Cd and Pb, the biosorption process in bagasse is proposed to be by physical adsorption.