Biogas conditioning and digestate recycling by microalgae: Acclimation of Chlorella vulgaris to H 2 S-containing biogas and high NH 4 -N digestate and effect of biogas: Digestate ratio
Chemical Engineering Journal, ISSN: 1385-8947, Vol: 453, Page: 139788
2023
- 20Citations
- 56Captures
- 1Mentions
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Investigators at University of Southern Alabama Discuss Findings in Chemicals and Chemistry (Biogas Conditioning and Digestate Recycling By Microalgae: Acclimation of Chlorella Vulgaris To H2s-containing Biogas and High Nh4-n Digestate and ...)
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Article Description
Microalgae have the potential for biogas upgrading and digestate management as a downstream technology of anaerobic digestion. Through the acclimation to typical swine manure digestate with 1630 mg/L NH 4 -N, semi-continuous microalgae treatment was operated for biogas treatment with up to 4000 ppm H 2 S. Control of pH was necessary at high biogas to digestate liquid (G/L) ratios above 1 mol/L or 25:1 v / v (1 atm, 25 °C). Biogas decarbonation and desulfurization were achieved simultaneously with G/L ratios from 0.04 to 1.63 mol/L (1:1 to 40:1 v / v, at 1 atm, 25 °C), and nearly all methane remained in the upgraded biogas. Ammonia nitrogen as high as 930 mg NH 4 -N/L/d was removed at higher G/L ratios. The removed carbon and nitrogen were captured and assimilated into biomass at rates up to 13 g CO 2 /L/d and 540 mg NH 4 -N/L/d, respectively. The optimal phosphorus assimilation rate was 49 mg PO 4 -P/L/d obtained at the G/L ratio of 1.02 mol/L. These findings demonstrate that microalgal can treat high-H 2 S biogas and high-NH 4 -N digestate within a broad range of G/L ratios, including ratios that are similar to biogas and digestate generation ratios from swine manure digesters.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1385894722052676; http://dx.doi.org/10.1016/j.cej.2022.139788; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85140340202&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1385894722052676; https://dx.doi.org/10.1016/j.cej.2022.139788
Elsevier BV
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