高有机负荷下的稻草两级/单级CSTR厌氧消化工艺性能研究

文章以稻草为原料,采用两级和单级厌氧消化工艺,在较高有机负荷(100,120,140 g/L)下对稻草的消化性能进行了研究。研究结果表明:当有机负荷分别为100,120,140 g/L时,两级厌氧消化系统的产甲烷效率分别比单级厌氧消化系统提高了8.8%,11.5%,11.8%;两级厌氧消化系统的产甲烷量主要集中在第一级,随着有机负荷的提高,第二级的产甲烷量占比逐渐增加;两级厌氧消化系统的物质转化率比单级厌氧消化系统更高,并且两级厌氧消化系统中的大部分物质在第一级去除,与产气效率的结果相一致;两级和单级厌氧消化系统在3个高有机负荷条件下均可以稳定运行。

A comparative study on anaerobic digestion performance of single system and serial CSTR system under high organic loading conditions with rice straw as feedstock

Using rice straw as raw material,serial and single anaerobic digestion processes were used to compare the digestion performance under high organic load(100,120,140 g/L).The results showed that under the three organic loads of 100,120,140 g/L,the biomethane production of serial system increased by 8.8%,11.5%and 11.8%respectively compared with single system.The biogas production of the serial system was mainly concentrated in the first stage.As the organic load increased,the proportion of the second-stage biogas production increased gradually.The substrate conversion rates of the serial system was higher than the single system,and most of the substances were removed in the first stage of the serial system,which was consistent with the biogas production efficiency results.The serial system and the single system can operate stably under three high organic load conditions.