光合产氢-膜曝气生物膜反应器耦合系统产氢与底物降解特性

Improving hydrogen production and substrate degradation in a photobioreactor coupling with a membrane-aerated biofilm reactor

为提高光合产氢反应器性能,构建了一种采用沼泽红假单胞菌CQK01接种的光生物产氢-膜曝气生物膜反应器(PBR-MABR)耦合系统。实验表明,在序批培养条件下,由于产氢过程中有机酸和氢离子不断积累,使得PBR系统的产氢速率远低于PBR-MABR系统,其产氢速率为0.49 mmol·(L·h)-1;而PBR-MABR、PBR-2MABRs和PBR-3MABRs的产氢速率则分别可达到0.61、0.76和0.85 mmol·(L·h)-1。这主要是由于有机酸被MABR中的透气膜上生长的生物膜不断降解所致。有机酸的降解不仅提高了耦合系统内pH值并在一定程度上缓解了体系中的产物抑制。

To enhance hydrogen production from glucose,membrane-aerated biofilm reactors（ MABRs） were coupled with a photobioreactor（ PBR） in this study. During a typical fed-batch cycle,the PBR inoculated with Rhodopseudomonas palustris CQK01 exhibited a hydrogen production rate of 0. 49 mmol·（ L·h）- 1. Upon coupling with one,two,or three MABRs,the hydrogen production rate was increased to 0. 61,0. 76,and 0. 85mmol·（ L·h）- 1,respectively. This increase was mainly due to the consumption of large amounts of the accumulated inhibitory byproduct and H＋from the PBR effluent by the biofilms attached to the membrane of the MABRs.