Metal nanoparticle elements such as Fe, Ni, and Co are promising in improving the performance and stability of anaerobic digestion. However, the impact of nanoparticle mixtures of Fe, Ni, and Co on biogas production from anaerobic digestion of cattle manure still needs further studies. Therefore, this study investigated the effect of the most effective concentrations of nanoparticle additives on biogas and CH₄ production and H₂S mitigation during anaerobic digestion of cattle manure. The nanoparticle additive concentrations were selected from the findings of previous studies and were 30 mg/L Fe, 2 mg/L Ni, and 1 mg/L Co at four combinations. Biogas production increased by 14.61% upon the use of nanoparticle mixtures of 30 mg/L Fe and 2 mg/L Ni compared with control (cattle manure-only). Furthermore, the addition of nanoparticle mixtures of 30 mg/L Fe, 2 mg/L, and 1 mg/L Co increased CH₄ production by 19.30% compared with control. Moreover, H₂S production decreased by 35.10% in the presence of nanoparticles mixture of 30 mg/L Fe, 2 mg/L, and 1 mg/L Co in comparison with control. Modified Gompertz and logistic function models were used to determine the kinetic constant of the reaction. The modified Gompertz model has the better predicting ability for cattle manure anaerobic digestion.

Fe，Ni和Co等金属纳米颗粒元素有望改善厌氧消化的性能和稳定性。然而，Fe，Ni和Co的纳米颗粒混合物对牛粪厌氧消化产生沼气的影响仍需进一步研究。因此，本研究调查了最有效浓度的纳米颗粒添加剂对沼气，CH ₄产生和H _{2的影响。}牛粪厌氧消化过程中的缓解。纳米颗粒添加剂的浓度选自先前的研究结果，四种组合分别为30 mg / L Fe，2 mg / L Ni和1 mg / LCo。与对照（仅牛粪）相比，使用30 mg / L Fe和2 mg / L Ni的纳米颗粒混合物，沼气产量增加了14.61％。此外，与对照相比，添加30 mg / L Fe，2 mg / L和1 mg / L Co的纳米颗粒混合物可将CH _4的产生增加19.30％。而且，H ₂与对照相比，在30 mg / L Fe，2 mg / L和1 mg / L Co的纳米颗粒混合物存在下，S产量降低了35.10％。修改后的Gompertz模型和逻辑函数模型用于确定反应的动力学常数。改进的Gompertz模型对牛粪厌氧消化具有更好的预测能力。