稻草与牛粪混合连续厌氧消化制备生物燃气研究

Continuous Anaerobic Co-digestion of Rice Straw and Cow Manure for Biogas Production

摘要:

以挥发性固体比1∶1的稻草与牛粪为混合原料，采用40L有机玻璃反应器进行连续厌氧消化，考察不同有机负荷率（OLR）3~12kg/(m3?d)及温度对厌氧消化性能及稳定性的影响。结果表明，高温消化在整个OLR范围内，池容产气率逐渐增加，最高达到5.26m3/(m3?d)，平均挥发性固体产气率在OLR为3.6kg/(m3?d)时达到最大值489.6L/kg；中温消化在OLR为12kg/(m3?d)时出现严重的VFAs抑制，在无挥发性脂肪酸抑制的OLR范围（3~8kg/(m3?d)）内，池容产气率逐渐增加，最高达到2.57m3/(m3?d)，平均挥发性固体产气率在OLR为3.6kg/(m3?d)时达到最大值440.0L/kg；当OLR升高到8kg/(m3?d)时，中温和高温发酵系统均出现了严重的污泥膨胀。

关键词:稻草;牛粪;混合厌氧消化;生物燃气

Abstract:

Using rice straw and cow manure (volatile solid ration 1∶1) as materials, continuous anaerobic co-digestions were carried out to investigate the effects of organic loading rate (OLR) and temperature on stability and performance. The experimental results showed that, for thermophilic digestion, volumetric biogas production rate (VBPR) increased with increasing of OLR and the maximum VBPR was 5.26m3/(m3?d). The maximum average specific biogas production (SBP) of 489.6L/kg was obtained at OLR of 3.6kg/(m3?d).For mesophilic digestion, biogas production was seriously inhibited by volatile fatty acids (VFAs) at OLR of 12kg/(m3?d). During the OLR of 3~8kg/(m3?d),VBPR gradually increased with the maximum of 2.57m3/(m3?d). The maximum average SBP of 440.0L/kg was obtained at OLR of 3.6kg/(m3?d). When the OLR increased to 8kg/(m3?d), serious sludge expanding was observed both in thermophilic and mesophilic system.

Key words:Rice straw;Cow manure;Anaerobic co-digestion;Biogas