Andersson Jonatan, Björnsson Lovisa
Department of Biotechnology, Lund University, Sweden.
Bioresour Technol. 2002 Oct;85(1):51-6. doi: 10.1016/s0960-8524(02)00071-8.
Straw was evaluated as a biofilm carrier in the methanogenic stage of the two-stage anaerobic digestion of crop residues. Three reactor configurations were studied, a straw-packed-bed reactor, a glass packed-bed reactor and a reactor containing suspended plastic carriers. The reactor with the packed straw bed showed the best results. It had the highest methane production, 5.4 11(-1) d(-1), and the chemical oxygen demand (COD) removal ranged from 73-50% at organic loading rates from 2.4-25 g COD l(-1) d(-1). The degradation pattern of volatile fatty acids showed that the degradation of propionate and longer-chain fatty acids was limiting at higher organic loading rates. A stable effluent pH showed that the packed-bed reactors had good ability to withstand the variations in load and volatile fatty acid concentrations that can occur in the two-stage process. The conclusion is that straw would work very well in the intended application. A further benefit is that straw is a common agricultural waste product and requires only limited resources concerning handling and cost.
在农作物秸秆两段式厌氧消化的产甲烷阶段，对秸秆作为生物膜载体进行了评估。研究了三种反应器配置，即秸秆填充床反应器、玻璃填充床反应器和装有悬浮塑料载体的反应器。装有秸秆填充床的反应器表现出最佳效果。其甲烷产量最高，为5.4 l(-1) d(-1)，在2.4 - 25 g COD l(-1) d(-1)的有机负荷率下，化学需氧量（COD）去除率在73 - 50%之间。挥发性脂肪酸的降解模式表明，在较高的有机负荷率下，丙酸盐和长链脂肪酸的降解受到限制。稳定的出水pH值表明，填充床反应器具有良好的能力来承受两段式工艺中可能出现的负荷和挥发性脂肪酸浓度的变化。结论是，秸秆在预期应用中效果良好。另一个好处是，秸秆是一种常见的农业废弃物，在处理和成本方面只需要有限的资源。
