Low H2S content biogas biodesulfurization from high solid sludge anaerobic digestion using limited external aeration biotrickling filter: Effect of gas-liquid pattern on oxygen utilization performance
2022
Zhuo, Yang | Yang, Peizhen | Zhou, Mengyu | Peng, Dangcong | Han, Yun
An efficient and precise method is needed for low H₂S content biogas biodesulfurization, produced during high solid sludge anaerobic digestion. Continuous experiments were conducted to evaluate the performance of a lab-scale biotrickling filter (BTF) in H₂S removal and oxygen utilization. The results show that the sulfur loading rate decreased by 66% compared to conventional H₂S content, thus achieving a sufficient removal efficiency (>0.9). With a limited external aeration (0.5–2.0 molO₂·molS⁻¹), the oxygen consumption (O/Sᵣₑ) to its supplement (O/Sᵢₙ) ratios increased from 50–71% (conventional H₂S) to 83–92% (low H₂S), indicating that low H₂S flux promotes a sufficient oxygen utilization. Furthermore, the difference in oxygen utilization between co-current and counter-current flow patterns decreased under limited external aeration as the H₂S content sharply decreased. These results indicate that a dynamic oxygen-sulfur (O–S) balanced multistage BTF is expected to achieve a more precise vertical O–S distribution for sulfur resource recovery.
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