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KMID : 1025520090510010075
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Journal of Animal Science and Technology
2009 Volume.51 No. 1 p.75 ~ p.80
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Effects of Microwave Irradiation on the Composition of Swine Manure and Crystallization of MAP
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Cho Joon-Hee
Ra Chang-Six
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Abstract
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Composition changes of swine manure and the effects on MAP(MgNH4PO46H2O) crystallization by microwave irradiation were examined. The concentration of PO43－ was increased within a fixed period of time and then decreased, but NH4-N was reduced continuously during microwave irradiation. Concentration of PO43－ was started to reduce just from the point of foam formation during microwave irradiation, and the temperature at that time was always 49℃ irrespectively to microwave irradiation rate. Inorganic carbon was reduced with microwave irradiation, but soluble organic carbon(TOCs) was increased proportionally. Crystallization rate under conditions of non-microwave irradiation, irradiation up to 93℃ and 48℃ was 87.8%, 87.3% and 98.5%, respectively, showing 10% enhancement when irradiated up to 48℃. However, removal efficiency of ammonia nitrogen was proportional to the microwave irradiation rate or duration, obtaining 2.5%, 4.5% and 10.2%, respectively. Based on these results, it would be a useful strategy to irradiate microwave up to 49℃ to enhance MAP crystallization rate by changing the ionic pattern of nutrients in the manure. Meanwhile, provision of enough microwave irradiation rate might be needed to achieve high NH4-N removal.
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KEYWORD
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Microwave, Swine manure, MAP(MgNH(4)PO(4)6H(2)O), Struvite
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