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Li D.,CAS Chengdu Institute of Biology | Liu S.,Chengdu Zhongke Energy and Environmental Protection Co. | Mi L.,Chengdu Zhongke Energy and Environmental Protection Co. | Li Z.,CAS Chengdu Institute of Biology | And 3 more authors.
Bioresource Technology | Year: 2015

In order to investigate the effects of feedstock ratio and organic loading rate (OLR) on the anaerobic mesophilic co-digestion of rice straw (RS) and cow manure (CM), batch tests (2.5L) were carried out at volatile solid (VS) ratios of 0:1, 1:2, 1:1, 2:1, and 1:0 (RS/CM), and continuous bench experiments (40L) were carried out at OLRs of 3.0, 3.6, 4.2, 4.8, 6.0, 8.0, and 12.0kgVS/(m3d) with optimal VS ratio. The optimal VS ratio was found to be 1:1. Stable and efficient co-digestion with average specific biogas production of 383.5L/kgVS and volumetric biogas production rate of 2.30m3/(m3d) was obtained at an OLR of 6kgVS/(m3d). Anaerobic co-digestion was severely inhibited by the accumulation of volatile fatty acids instead of ammonia when the OLR was 12kgVS/(m3d). Further, significant foaming was observed at OLR≥8kgVS/(m3d). © 2015 Elsevier Ltd.


Li D.,CAS Chengdu Institute of Biology | Liu S.,Chengdu Zhongke Energy and Environmental Protection Co. | Mi L.,Chengdu Zhongke Energy and Environmental Protection Co. | Li Z.,CAS Chengdu Institute of Biology | And 3 more authors.
Bioresource Technology | Year: 2015

In order to investigate the effects of feedstock ratio and organic loading rate (OLR) on the anaerobic mesophilic co-digestion of rice straw (RS) and pig manure (PM), batch bottle tests (2.5L) were carried out at volatile solid (VS) ratios of 0:1, 1:2, 1:1, 2:1, and 1:0 (RS/PM), and continuous bench experiments (40L) were carried out at OLRs of 3.0, 3.6, 4.2, 4.8, 6.0, 8.0, and 12.0kg VS/(m3d) with optimal VS ratio. The results showed that the optimal ratio was 1:1 in terms of biogas yield. Stable biogas production with an average specific biogas production of 413L/kg VS was obtained at an OLR of 3-8kg VS/(m3d). Anaerobic co-digestion was severely inhibited by the accumulation of volatile fatty acids when the OLR was 12kg VS/(m3d). Further, light and serious foaming were observed at OLR of 8 and 12kg VS/(m3d), respectively. © 2015 Elsevier Ltd.

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