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Structural carbohydrate availability with electrochemical ozonation and ammonia pressurization / depressurization pre-treatment technologies
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Experiments were conducted to determine the quantity and conditions of electrochemical ozonation (O₃) that maximize the dissolution of the lignin-cellulose complex. Combination treatments of anhydrous ammonia (NH₃) and O₃ were also assessed for possible additive affects. In experiment 1, samples of rice straw (RS) were hydrated to between 13 and 75% H₂O. Samples were then subjected to O₃ for 80 min at 2 L of O₃/min. Neutral detergent fiber (NDF), hemicellulose (HC) and lignin (LG) content were reduced (p < .05) to the greatest extent at H₂O concentrations of between 34.7 and 19.9%. In experiment 2, samples of RS were processed with O₃ at 20 min intervals yielding final O₃ concentrations of 5.2, 10.4, 15.6, 20.8 and 26.0 L of O₃/g of substrate. NDF and HC contents decreased linearly with increasing O₃ concentration. Effects on lignin content however were not observed until the 10.4 L O₃ treatment point. In situ dry matter digestibility (ISDMD) was increased (p < .05) with the 10.4 - 26.0 L O₃ treatments at all in situ times. In experiment 3, samples of triticale straw (TS), rice straw (RS), wheat straw (WS) and rice hulls (RH) were processed with O₃ using treatment conditions established in experiments 1 and 2. NDF, HC and LG contents were significantly decreased (p < .01) in O₃ treated samples. ISDMD for all substrates was significantly increased (p < .05) at all in situ times. In experiment 4, samples of RS were processed with both O₃ and NH₃ in alternate combination treatments. NDF, LG and HC contents were reduced (p < .05) to the greatest extent with the O₃ / NH₃ (ONH) combination treatment. ISDMD for ONH treated RS was increased (p < .05) over both O₃ and NH₃ treatments alone at all in situ times. Results of this study suggest the following. Moisture concentrations of between 20 and 35% are most effective in catalyzing ozonation processes. The quantity of O₃ required to significantly affect LG content and enhance ISDMD was shown to be greater than 15.6 L/g. Treatment with O₃ in combination with NH₃ proved to be more effective in increasing substrate quality over either treatment alone.
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Includes bibliographical references (leaves 83-88).
Issued also on microfiche from Lange Micrographics.
Williams, James Jason (1999). Structural carbohydrate availability with electrochemical ozonation and ammonia pressurization / depressurization pre-treatment technologies. Master's thesis, Texas A&M University. Available electronically from
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