돈분 슬러리 성상에 따른 최적 바이오가스 회수
Optimum Recovery of Biogas from Pig Slurry with Different Compositions
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초록
돈분 슬러리를 이용한 혐기성 소화과정에서 유기물 농도및 식종슬러지의 식종비율, 소화조의 혼합강도 등의 최적 실험조건을 도출하고, 돼지의 성장에 따른 사료 급여 특성과 분뇨의 성상이 바이오가스 발생에 미치는 영향을 관찰하였다. 식종슬러지 비율 50%와 TS 농도 1% 수준에서 메탄함량은45%이었고, 유기물 함량이 3~7 %로 증가할수록 메탄가스함량도 증가되었다. 반응조의 혼합강도에 따른 총 누적가스발생량은 식종슬러지의 식종비율에 따른 영향은 관찰되지 않았고, TS 농도 3%와 5%에서 혼합강도를 증가시켰을 때(80 → 160 rpm) 바이오가스 발생량도 증가되었다. 돈분폐수의혐기소화 실험시 바이오가스를 회수하고자 하는 최적의 운전조건은 투입되는 TS 농도 3~5% 정도의 유기물 농도와 50%수준의 식종슬러지의 식종비율 그리고 반응조의 적절한 교반강도(120 rpm) 따라 결정될 수 있다. 돈분뇨 종류에 따른 가스발생량은 분만돈 분뇨의 바이오가스 발생량이 높았고, gas 발생의 peak(20일)도 짧게 나타나 분해율이 가장 좋은 것으로 나타났다. 돼지의 사육 및 소비 형태에 따라 돼지의 사육 환경이 변화되며, 투입되는 사료의 급여 특성도 달라져 바이오가스 발생 특성도 차이가 있는것으로 나타났다.
Abstract
This study was conducted to investigate the optimum conditions for efficient methane production through anaerobic digestion of pig waste slurry. The examined parameters were organic matter content of the pig slurry, the ratio of seed sludge to pig slurry, and stirring intensity of the digestion reactor. The effects of types of slurry produced from different purpose-based pigs fed with different feeds were also tested. The methane concentration in the produced biogas was 45% when the ratio of seed sludge to pig slurry was 50% and total solid (TS) concentration was 1%, and it increased in proportional to TS concentration increases from 3 to 7%. At 3 and 5% of TS concentration, increasing mixing velocity from 80 to 160 rpm resulted in higher biogas production amount. However, mixing amount of seed sludge did not cause any significant effect on biogas production. Overall, the most efficient biogas production was achieved at 3-5% TS concentration in combination with 50% seed sludge inoculation and mixing velocity at 120 rpm. Among pig slurry types, gestating sow waste slurry showed the highest biogas production probably due to higher the degradation rate than other types of pig waste slurry being affected by the feeds components.
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