Journal
BIORESOURCE TECHNOLOGY
Volume 320, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124436
Keywords
Anoxygenic photosynthetic; Biological nitrogen removal; Resource recovery; Rhodopseudomonas sp.; Wastewater treatment
Funding
- Bill and Melinda Gates Foundation under the `Reinvent the Toilet Challenge' program [OPP1155615]
- Bill and Melinda Gates Foundation [OPP1155615] Funding Source: Bill and Melinda Gates Foundation
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The study characterized a community of purple phototrophic bacteria (PPB) enriched from municipal wastewater to assess their growth, tolerance, composition, and potential for resource recovery from NH4+-rich medium. The results showed that PPBs demonstrated remarkable tolerance to high concentrations of NH4+-N and acetate, with the potential for growth and protein accumulation even at elevated levels of these compounds. This suggests that PPBs have promising applications for resource recovery from NH4+-rich wastewater.
Purple phototrophic bacteria (PPB) community, enriched from municipal wastewater, was characterized to assess their growth, tolerance, composition and potential for resource recovery from NH4+-rich medium. Batch experiments were conducted in tissue culture flasks and glass bottles under anaerobic conditions with infra-red lights. PPBs showed remarkable tolerance to high concentrations of NH4+-N and acetate. Below 1.5 g/L, growth was unaffected by NH4+-N with optical density at 590 nm (OD590) reaching 2.6-2.9, while they could tolerate 4.5 g/L NH4+-N. Similarly, PPB growth was unaffected at acetate concentrations below 4 g/L and they could tolerate >20 g/L acetate. Taxonomic characterization showed that the community comprised of 37-52% PPBs (with 15-20% proteins) under different conditions, with Rhodobacter sp. over Rhodopseudomonas sp. dominating at higher NH4+-N concentrations. PPBs showed growth and removal rates in anaerobic digestate and accumulated 26% proteins. These results indicated the potential of PPBs in resource recovery from NH4+-rich wastewater.
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