Department of Thematic Studies, Environmental Change, Linköping University, 581 83 Linköping, Sweden.
Scandinavian Biogas Fuels AB, Holländargatan 21A, 111 60 Stockholm, Sweden.
Waste Manag. 2016 Oct;56:166-72. doi: 10.1016/j.wasman.2016.06.034. Epub 2016 Jul 21.
Kraft fibre sludge from the pulp and paper industry constitutes a new, widely available substrate for the biogas production industry, with high methane potential. In this study, anaerobic digestion of kraft fibre sludge was examined by applying continuously stirred tank reactors (CSTR) with sludge recirculation. Two lab-scale reactors (4L) were run for 800days, one on fibre sludge (R1), and the other on fibre sludge and activated sludge (R2). Additions of Mg, K and S stabilized reactor performance. Furthermore, the Ca:Mg ratio was important, and a stable process was achieved at a ratio below 16:1. Foaming was abated by short but frequent mixing. Co-digestion of fibre sludge and activated sludge resulted in more robust conditions, and high-rate operation at stable conditions was achieved at an organic loading rate of 4g volatile solids (VS)L(-1)day(-1), a hydraulic retention time of 4days and a methane production of 230±10NmL per g VS.
制浆造纸工业的纤维污泥是沼气生产行业的一种新型、广泛可用的底物，具有较高的甲烷潜力。本研究采用带有污泥再循环的连续搅拌槽式反应器（CSTR）对纤维污泥的厌氧消化进行了考察。两个实验室规模的反应器（4L）运行了 800 天，一个用于纤维污泥（R1），另一个用于纤维污泥和活性污泥（R2）。添加镁、钾和硫稳定了反应器的性能。此外，钙：镁比很重要，在低于 16:1 的比值下可实现稳定的工艺。通过短时间但频繁的搅拌可以抑制泡沫的产生。纤维污泥和活性污泥的共消化导致了更稳定的条件，在有机负荷为 4g 挥发性固体（VS）L(-1)天(-1)、水力停留时间为 4 天和甲烷产率为 230±10NmL 每克 VS 的稳定条件下实现了高速率运行。
