混合水解对打捆麦秸水解产酸的影响

为研究混合水解对麦秸水解产酸的影响，以猪粪、厨余和蔬菜废物为原料，研究其分别与麦秸混合水解产酸的特性，分析了水解过程中pH值、COD、SCOD和VFAs的变化。结果表明，除麦秸＋蔬菜废物最佳出料时间为3～9d外，麦秸、麦秸＋厨余垃圾、麦秸＋猪粪水解液最佳出料时间均为3～7d，7d后水解液COD浓度下降；将蔬菜废物与麦秸混合水解，水解液pH值降低幅度最大，水解液中总有机酸浓度最高，pH值最低为5．31，有机酸浓度最高达6．46g／L，且水解液中SCOD浓度、SCOD／COD比值最大；添加猪粪明显促进了麦秸有机物的水解溶出，麦秸单位干物质水解率和产酸率较对照分别提高了43％～134％和50．53％，但对提高水解液SCOD浓度、SCOD／COD比、TVFA浓度、降低水解液pH值的效果不如蔬菜废物；添加厨余垃圾的效果介于猪粪和蔬菜废物之间。从促进麦秸水解产酸的角度，以添加猪粪的效果最好。

Effect of multi-component mixing on hydrolysis and acidification of baled wheat straw

Effect of muhi-component mixing on hydrolysis and acidification of baled wheat straw was stua- ied. The pH value, COD, SCOD and volatile fatty acids （VFAs） content of hydrolysis liquid were analyzed dur- ing the experiment process. The results showed that, either wheat straw hydrolyzed alone or hydrolyzed with other organic wastes, the appropriate output time was 3 -7 d. After that, COD content of hydrolysis liquid decreased slowly. The lowest pH value of 5.31 and the highest VFAs content of 6.46 g/L were obtained at treatment of vegetable waste ＋ wheat straw. Compared to wheat straw hydrolyzed alone, after pig manure addition, hydrolysis rate of wheat straw was improved and hydrolysis rate and organic acid production rate of wheat straw （based on dry matter） increased by 43% - 134% and 50.53% , respectively. However, the efficiency of improving SCOD content, rate of SCOD/COD, content of total volatile fatty acid and reducing pH value were not as good as treat- ment of vegetable waste ＋ wheat straw. The results of treatment of food waste ＋ wheat straw was between treat- ment of pig manure ＋ wheat straw and treatment of vegetable waste ＋ wheat straw. From the point of improving hydrolysis and acidification rate of wheat straw, adding pig manure was best for hydrolysis and acidification of wheat straw.