Biological treatment of high salinity organic wastewater is a significant challenge because many microorganisms involved in the anaerobic digestion process cannot survive high osmotic pressures. In order to alleviate some of the stresses associated with the treatment of high salinity wastewater, two lab-scale up-flow anaerobic sludge bed reactors with or without magnetite (100 g/L) were used to treat high salinity organic wastewater. This study showed that the bioreactor amended with magnetite had higher chemical oxygen demand removal efficiencies (90.2% ± 0.54% vs 73.1% ± 1.9%) and methane production rates (4082 ± 334 ml (standard temperature and atmospheric pressure, STP)/d vs 2640 ± 120 ml (STP)/d) than the non-amended control reactor. In addition, the consumption of volatile fatty acids (20.9 ± 3.4 mM vs 61.7 ± 2.0 mM) was accelerated. Microbial community analysis revealed that the addition of magnetite caused the enrichment of many bacterial genera known to form robust biofilms (i.e. Pseudomonas) that are also capable of extracellular electron transfer and methanogens from the genus Methanosarcina which have been shown to participate in direct interspecies electron transfer. These results show that magnetite addition could enhance the performance of anaerobic digesters treating high salinity wastewater.

高盐度有机废水的生物处理是一项重大挑战，因为厌氧消化过程中涉及的许多微生物无法在高渗透压下生存。为了减轻与高盐度废水处理相关的某些压力，两个实验室规模的上流式厌氧污泥床反应器（含或不含磁铁矿）（100 g / L）用于处理高盐度有机废水。这项研究表明，用磁铁矿修饰的生物反应器具有更高的化学需氧量去除效率（90.2％±0.54％vs 73.1％±1.9％）和甲烷产生速率（4082±334 ml（标准温度和大气压，STP）/ d vs比未修正的对照反应器高2640±120 ml（STP）/ d）。此外，加速了挥发性脂肪酸的消耗（20.9±3.4 mM对61.7±2.0 mM）。假单胞菌），其也能够从该属的细胞外电子传递和产甲烷的甲烷，其已经显示参与直接种间的电子转移。这些结果表明，磁铁矿的添加可以提高厌氧消化池处理高盐度废水的性能。