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. 2020 Sep 28;6(9):e05036. doi: 10.1016/j.heliyon.2020.e05036

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© 2020 The Author(s)

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

PMC Copyright notice

Carbon to nitrogen (C/N) ratio of different biological hydrolysis-pretreated (BH-P) mixtures (w/w) of rice straw (RS) and Ulva spp. (U), and the hydrogen sulfide (H₂S) content (n = 3, error bar = s.d.) of the biogas after their anaerobic co-digestion (ACD) using thalassic (TH) condition. The relationship between C/N () and actual methane yield could not be established due to the utilization of batch digester, which allowed longer retention time for the limited N to be recycled in the system. The decreasing amount of U coincided with the decreasing H₂S content (), which was dictated by the amount of sulfate from the seawater in 100% RS along with the sulfate released from the hydrolysis of sulfated polysaccharides of U in 100% U, 75U:25RS, 50U:50RS, and 25U:75RS.

Carbon to nitrogen (C/N) ratio of different biological hydrolysis-pretreated (BH-P) mixtures (w/w) of rice straw (RS) and Ulva spp. (U), and the hydrogen sulfide (H₂S) content (n = 3, error bar = s.d.) of the biogas after their anaerobic co-digestion (ACD) using thalassic (TH) condition. The relationship between C/N () and actual methane yield could not be established due to the utilization of batch digester, which allowed longer retention time for the limited N to be recycled in the system. The decreasing amount of U coincided with the decreasing H₂S content (), which was dictated by the amount of sulfate from the seawater in 100% RS along with the sulfate released from the hydrolysis of sulfated polysaccharides of U in 100% U, 75U:25RS, 50U:50RS, and 25U:75RS.