The presence of micro-nutrients can be stimulatory for the anaerobic digestion (AD) of hardly degradable wastes and thus, improve process performance. Among the essential trace elements, nickel is involved in multiple important enzymes necessary for efficient AD. The present study investigates the effect of nickel spiked sewage sludge on batch and continuous mode operation. Metal spiking was conducted in the form of nanoparticles (Ni-NPs) and salt (NiCl₂·6H₂O). Results from batch assays showed that 5 mgNi-Salt/kgVS in the presence of Nitrilotriacetic acid (NTA) enhanced the methane yield by ∼10% compared to the untreated sample. The impact of Ni-NPs in the AD process was also positive, but slightly lower compared to the effect of NiCl₂·6H₂O. The stimulatory impact of Ni was also revealed in continuously fed digester boosting the methane yield by ∼8%. Overall, the improved methane production indicated that methanogenic archaea were favoured by the simultaneous supplementation of Ni and NTA.

微量营养素的存在可以促进难降解废物的厌氧消化（AD），从而提高工艺性能。在必需的微量元素中，镍参与有效AD必需的多种重要酶。本研究调查了镍加标污水污泥对分批和连续模式运行的影响。以纳米颗粒（Ni-NPs）和盐（NiCl ₂ ·6H ₂ O）的形式进行金属加标。批次分析的结果表明，与未处理的样品相比，在亚硝酸三乙酸（NTA）存在下5 mgNi-Salt / kgVS可将甲烷产率提高约10％。Ni-NPs在AD过程中的影响也是积极的，但比NiCl ₂ ·6H ₂的影响要低O.在连续进料的蒸煮器中还显示出Ni的刺激作用，将甲烷产率提高了约8％。总体而言，甲烷产量的提高表明，同时添加Ni和NTA有利于产甲烷的古细菌。