Nickel spiking to improve the methane yield of sewage sludge

Panagiotis Tsapekos, Merlin Alvarado-Morales, Juan Tong, Irini Angelidaki*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

15 Downloads (Pure)


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.
Original languageEnglish
JournalBioresource Technology
Pages (from-to)732-737
Publication statusPublished - 2018


  • Anerobic digestion
  • Sludge
  • Trance elements
  • Nickel
  • Nitrilotriacetic acid (NTA)

Fingerprint Dive into the research topics of 'Nickel spiking to improve the methane yield of sewage sludge'. Together they form a unique fingerprint.

Cite this