To study the influence of separated two-phase anaerobic fermentation leachate recirculation on anaerobic process, the equipment was developed to simulate the leachate recirculation between the two phases. The gas production performance with leachate recirculation under two reflux modes of spray and immersion was comparative analyzed, including leachate pH, VFA (volatile fatty acids) and changes in composition and their influences on gas production. And the TS gas production per unit material under the two reflux modes was calculated. The, test results showed that in the separated two-phase anaerobic fermentation process, the system had better gas production performance and stability under immersion mode of leachate recirculation, its cumulative gas production was two times than that with spray mode, the TS gas production per unit material mass was up to 217.88 mL/g.%为研究分离式两相厌氧发酵工艺中渗滤液同流对其发酵过程的影响,在试验室对分离式两相工艺流程进行模拟,实现两相间渗滤液相互回流.比较分析渗滤液在喷淋和浸泡两种回流方式下的产气性能,重点分析两种同流方式下渗滤液pH值、挥发性脂肪酸总量及成分的变化以及其与产气量之间的关系,并计算出两种回流方式下的单位物料TS产气量,试验结果表明:分离式两相厌氧发酵工艺中,系统在渗滤液浸泡回流方式下稳定性更好,产气性能更佳,累计产气量是喷淋同流方式的2倍,其物料单位质量TS产气量可达217.88 mL/g.
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