AI Article Synopsis
- A study evaluated photosynthetic biogas upgrading in a high rate algal pond connected to an absorption column on a semi-industrial scale.
- Researchers tested different biogas flowrates, liquid-to-biogas ratios, types of wastewater, and hydraulic retention times to assess their impact on biomethane quality.
- The results showed that a higher liquid-to-biogas ratio improved the removal of carbon monoxide and hydrogen sulfide, with the best performances observed with centrate wastewater, but the maximum methane content was limited by nitrogen and oxygen release.
Article Abstract
The performance of photosynthetic biogas upgrading coupled to wastewater treatment was evaluated in an outdoors high rate algal pond (HRAP) interconnected to an absorption column at semi-industrial scale. The influence of biogas flowrate (274, 370 and 459 L h), liquid to biogas ratio (L/G = 1.2, 2.1 and 3.5), type of wastewater (domestic versus centrate) and hydraulic retention time in the HRAP (HRT) on the quality of the biomethane produced was assessed. The highest CO and HS removal efficiencies (REs) were recorded at the largest L/G due to the higher biogas-liquid mass transfer at increasing liquid flowrates. No significant influence of the biogas flowrate on process performance was observed, while the type of wastewater was identified as a key operational parameter. CO and HS-REs of 99% and 100% at a L/G = 3.5 were recorded using centrate. The maximum CH content in the biomethane (90%) was limited by N and O desorption.
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| http://dx.doi.org/10.1016/j.biortech.2019.01.110 | DOI Listing |
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