CAJ | 학술논문

利用农作物秸秆进行厌氧发酵生产沼气是解决我国农村能源紧张的重要途径，然而秸秆中难以降解的木质纤维结构导致在发酵过程中甲烷转化率较低。利用自行设计的可控性恒温发酵装置，以玉米秸秆为发酵原料，分析了在不同温度条件下氢氧化钠（NaOH）预处理对秸秆木质纤维结构以及厌氧发酵产气效率的影响。结果表明， NaOH预处理能够显著降低玉米秸秆的木质纤维素含量，与未预处理的秸秆相比，经NaOH处理后的秸秆纤维素含量降低了24.4%～33.2%，半纤维素含量降低了14.2%～52.4%，木质素含量降低了9.3%～29.3%。在6%、8%和10%浓度中，经8%NaOH处理的秸秆在55℃下的甲烷产量最高，达到188.7 ml CH4·(gVS)-1，较未处理的增加了84.2%，因此可作为提高秸秆厌氧发酵产气效率的预处理方法。
이용농작물갈간진행염양발효생산소기시해결아국농촌능원긴장적중요도경，연이갈간중난이강해적목질섬유결구도치재발효과정중갑완전화솔교저。이용자행설계적가공성항온발효장치，이옥미갈간위발효원료，분석료재불동온도조건하경양화납（NaOH）예처리대갈간목질섬유결구이급염양발효산기효솔적영향。결과표명， NaOH예처리능구현저강저옥미갈간적목질섬유소함량，여미예처리적갈간상비，경NaOH처리후적갈간섬유소함량강저료24.4%～33.2%，반섬유소함량강저료14.2%～52.4%，목질소함량강저료9.3%～29.3%。재6%、8%화10%농도중，경8%NaOH처리적갈간재55℃하적갑완산량최고，체도188.7 ml CH4·(gVS)-1，교미처리적증가료84.2%，인차가작위제고갈간염양발효산기효솔적예처리방법。
Methane production through anaerobic digestion (AD) using agricultural straw is an important way to resolve the energy shortage in rural China. However, the AD technology is limited by low conversion efficiency due to recalcitrant nature of lignocellulosic structure in the straw. In the present study, the effect of sodium hydroxide (NaOH) pretreatment at three temperatures on the biogasification performance of corn straw through AD was evaluated by using a laboratory-scale, continuous anaerobic biogas digester. NaOH pretreatment was effective in biodegradation of the lignocellulosic structure of corn straw. The cellulose content of pretreated straw was decreased by 24.4% to 33.2%, the hemicellulose content decreased by 14.2% to 52.4%, and the lignin content decreased by 9.3% to 29.3%, compared with those of untreated straw. The highest methane yield, 188.7 ml CH4·(gVS)-1, was achieved when the corn straw was pretreated with 8% NaOH at 55℃, which was 84.2% higher than that of untreated straw. Therefore, pretreatment of 8% NaOH at 55℃ is recommended to improve biodegradability and enhance anaerobic digestibility of straw.