亚硫酸氢盐预处理对黄贮玉米秸秆产甲烷潜力机理研究

Effect of Bisulfite on Methane Production Potential of Dry Corn Straw with Pretreatment by Yellow Silage

为了更好地解决东北寒区农作物秸秆环境污染、资源浪费、转化利用率低的问题,开展了亚硫酸氢盐与黄贮法联用处理玉米秸秆对其产气潜力影响的研究。结果表明:当预处理液中亚硫酸氢钠浓度为6.0%时,预处理后的玉米秸秆酶解糖化率达83.0%左右,甲烷日产量达131.3 mL·g^(-1)TS,甲烷累积产气量达1462.2 mL·g^(-1)TS。相对于单一黄贮预处理法,采用联合法预处理后玉米秸秆组分中木质素被大量降解,纤维素保留率,结构疏散,纤维素、半纤维素可生化性提高,产气效果较好,有利于后续资源化的利用,且在一定范围内较低的亚硫酸氢钠用量好于较高的亚硫酸氢钠用量,所以亚硫酸氢钠用量在4.0%~5.0%为宜。适用于寒区秸秆资源化处理与利用的工程前预处理,且能节约成本,具有较好的经济效益、环境效益、社会效益。

For better solution the problems of environmental pollution,resource waste and low conversion and utilization rate of crop straw in the cold region of northeast China,In this paper,the effects of sodium bisulfite combined with dry corn straw(CS)with pretreatment by yellow silage(DCSYS)on the gas production potential of corn straw were studied.The results showed that:When the concentration of sodium bisulfite in the pretreatment solution was 6.0%,the enzymolysis rate of corn straw after pretreatment was about 83.0%,the daily production of methane reached 131.3 mL·g^(-1)TS,the cumulative production of methan reached reached 1462.2 mL·g^(-1)TS.Compared with the single pretreatment method of(DCSYS),the lignin in the corn straw pretreated by the combined method is greatly degraded,and the retention rate of cellulose is improved,the structure is more evacuated,the biodegradability of cellulose and hemicellulose is improved,and the gas production effect is better,which is conducive to the subsequent resource utilization.Moreover,the lower sodium bisulfite dosage is better than the higher sodium bisulfite dosage in a certain range,so the sodium bisulfite dosage is suitable for 4.0%~5.0%.This pretreatment process is suitable for the pre-engineering pretreatment of straw resource treatment and utilization in cold areas,and can save cost,and has good economic benefits,environmental benefits and social benefits.