厌氧条件下序批操作与连续操作对基质利用的影响(英文)

Comparison of Carbohydrate Utilization in Batch and Continuous Operation of Anaerobic System

研究了在厌氧条件下以葡萄糖为基质的序批操作与连续操作反应器中微生物利用基质的不同途径.结果表明,在连续操作中,反应器内的VFA及污泥中的糖原含量保持不变,葡萄糖被用于产生甲烷和微生物增殖,两者分别占进水COD的79.34%和20.62%,氢分压在298Pa左右.在序批操作中,当进水结束时,50.17%的葡萄糖被转化为糖原储存于细胞体内,反应器内的VFA、产生的甲烷及微生物增殖分别占进水COD的25.05%、11.56%和13.22%;当反应结束时,葡萄糖转化为甲烷和微生物细胞的部分分别占进水COD的78.13%和20.6%,积累的VFA及储存的糖原被微生物代谢,最高氢分压为14.29Pa.两种不同操作模式下葡萄糖的代谢途径不同,序批式反应器中由于糖原储存的存在,减缓了VFA的积累,为厌氧系统的高效、稳定运行提供了保证.

Substrate utilization in a glucose-fed anaerobic reactor in continuous and batch sys- tem was investigated. In continuous system, concentration of glycogen and VFA remained the same, the substrate transformed into methane （79.34%） and microbial cells （20.66%）, and hydrogen pressure was around 298 Pa. In batch system, 50%of the substrate fed was taken up rapidly as glycogen which accumulated in the cell, the rest was changed to VFA （25.05%）, methane （11.56%） and microbial cell （13.22%）. After the reaction, the per- centage of glycogen and VFA was exhausted completely, and the substrate mainly changed to methane （78.13%） and microbial cells （20.60%）. The maximum hydrogen pressure was 14.29 Pa. The utilization ways in two systems are different, but the results are similar. VFA accumulation slowed down due to glucose storage, which makes the system more sta- ble in batch system.