Residual phosphorus supply for methanotrophic cultivation and microbial protein production

E. M. Goonesekera, P. Tsapekos, I. Angelidaki, B. Valverde Pérez*

*Corresponding author for this work

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

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Abstract

Microbial protein (MP) is a promising alternative protein source with several economic and environmental advantages. Currently, there is a research trend investigating the use of residual sources for the inputs of the production process, so it becomes more circular and efficient. In this study, the residual phosphorus (P) sources struvite and precipitated calcium phosphate (PCP), recovered from wastewater, were evaluated as P sources for the production of MP using methane oxidising bacteria (MOB). The study aims to understand the P requirements of bacteria in order to optimise P dosing in the culture medium. Since phosphate is provided in excess as a buffer, its optimal supply for assimilation will have an impact on pH control. Thus, pH and buffer capacity are also monitored. Both nitrate and ammonium were used as nitrogen sources, as they have different impacts on pH. Additionally, strategies for the dissolution of struvite and PCP were assessed, as were their implications on process design. MOB were capable of growing with both PCP and struvite as a phosphorus source. However, PCP shows lower growth rates and is more difficult to dissolve efficiently. Struvite was thus the best candidate for P recovery via MP from MOB.
Original languageEnglish
Publication date2022
Number of pages3
Publication statusPublished - 2022
Event IWA Wastewater, Water and Resource Recovery (WWRR) - Online, Poznan, Poland
Duration: 10 Apr 202213 Apr 2022

Conference

Conference IWA Wastewater, Water and Resource Recovery (WWRR)
LocationOnline
Country/TerritoryPoland
CityPoznan
Period10/04/202213/04/2022

Keywords

  • Nutrient recovery
  • Microbial protein
  • Methanotrophs

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