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임성빈 ( Seong-been Im ),이윤희 ( Yunhee Lee ),어성욱 ( Seong-wook Oa ) 한국폐기물자원순환학회 2021 한국폐기물자원순환학회지 Vol.38 No.1
In this study, a nitrogen enrichment apparatus was designed as a way to recover nitrogen resources from livestock manure. The properties of the nitrogen concentrates were analyzed by varying operating parameters and conditions. The nitrogen enrichment apparatus was decompressed and heated based on the fundamental principle of conversion of dissolved ammonium ions into ammonia depending on the temperature. Converted to a gas, ammonia was recovered as nitrogen concentrates by an indirect cooling system. Samples were used in three types: raw livestock manure, solid-liquid separated wastewater, and dewatered effluent after thermohydrolysis. When operating based on a pressure of 0.3 bar, the solids concentration of the samples and the amount of livestock manure input were correlated with the operating time, final temperature, and recovery amount. The results were as follows: the lower the solids concentration and the higher the amount of input, the greater the amount of recovery was possible. When 60 L of livestock manure were added, a maximum of 35 L was recovered. In the case of a 40 L input, up to 19 L were recovered. The average concentration of the recovered nitrogen concentrate was 13,385 mg/L based on T-N, and was concentrated to a maximum of 18,915 mg/ L. As the nitrogen concentrate recovered, the concentration of the nitrogen decreased, and when large amounts were recovered, up to 93.6% of the nitrogen content in the livestock manure was recovered.