Process instability with consecutive low methane production are common challenges of the anaerobic digestion (AD) of municipal wastes. In the present study, the co-digestion of sewage sludge and municipal biopulp was investigated at batch and continuously fed digesters. At batch tests, the highest methane yield for co-digestion (467 ± 17 mLCH₄/gVS) was achieved when biopulp contributed to 80% of organic matter content and sludge the remaining 20%. At continuous mode operation, co-digestion achieved 0.91 ± 0.11 L/(L·d) methane productivity, while mono-digestion of sludge achieved 0.62 ± 0.05 L/(L·d). Potassium inhibition was investigated at the most efficient co-digestion scenario and was found that the half maximal inhibitory concentration (IC₅₀) occurred at 8 g-K⁺/L. Subsequently, the effect of K⁺ was investigated at different scenarios at continuous operation. Simulations based on BioModel described the inhibitory effect of K⁺ by introducing non-competitive inhibition of methanogens. Simulation results confirmed the strongly inhibitory effect of potassium to the AD process.

连续产生低甲烷的过程不稳定是城市垃圾厌氧消化（AD）的普遍挑战。在本研究中，对分批和连续进料的消化池中污水污泥和市政生物浆的共消化进行了研究。在分批测试中，当生物浆占有机物含量的80％并剩余剩余的20％的污泥时，共消化的甲烷产量最高（467±17 mLCH ₄ / gVS）。在连续模式操作下，共消化达到0.91±0.11 L /（L·d）的甲烷生产率，而污泥的单消化达到0.62±0.05 L /（L·d）。在最有效的共消化方案中研究了钾的抑制作用，发现钾的半数最大抑制浓度（IC ₅₀）在8 gK ⁺/升 随后，在连续运行的不同场景下研究了K ⁺的影响。基于BioModel的模拟通过引入非竞争性抑制产甲烷菌来描述K ⁺的抑制作用。模拟结果证实了钾对AD过程的强烈抑制作用。