Development of Thermophilic Oxic Process for High Rate Degradation of Livestock Organic Waste and Recovery of Nitrogen and Phosphorus Resources

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In this study, bench scale and pilot plant experiment using a swine waste were carried out in order to develop thermophilic oxic fermentation process for high rate degradation of livestock organic waste and recovery of nitrogen and phosphorus resources. The results obtained by this study are summarized as follows.1) In bench scale experiment, it was possible to remove carbon of about 86% and moisture of 98% under the conditions of BOD loading of 3 kg m^<-3> day^<-1>, air flow of 100 L m^<-3> min^<-1> and adding edible oil of 120 mL.2) 55% was optimum as average water content, and ATP concentration and thermophile number became highest under this condition.3) As a result of the long-term operation in bench scale experiment, it was able to treat swine waste efficiently during first 60 days and the treatment efficiency lowered after that. The treatment efficiency was recovered by changing cedar chip of 50% on day 86.4) In the pilot plant experiment, 64℃ of fermentation temperature and weight loss rate of 91% were achieved. In the water, which accumulated in the cooler, high concentrated T-N was detected, though TOC and T-P were not detected. It was cleared nitrogen was removed as an ammonia gas.5) By shortening input interval of organic waste from 24 hours to 8 hours, treatment volume increased over the double. It was shown that the optimization of input condition of organic waste enabled the high rate degradation.