Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain.
Water Sci Technol. 2011;64(1):233-8. doi: 10.2166/wst.2011.648.
The treatment of H2S in the biogas produced during anaerobic digestion has to be carried out to ensure the efficient long-lasting use of its energetic potential. The microaerobic removal of H2S was studied to determine the treatment capacity at low and high H2S concentrations in the biogas (0.33 and 3.38% v/v) and to determine the optimal O2 rate that achieved a concentration of H2S of 150 mg/Nm3 or lower. Research was performed in pilot-plant scale digesters of sewage sludge, with 200 L of working volume, in mesophilic conditions with a hydraulic retention time of 20 d. O2 was supplied at different rates to the headspace of the digester to create the microaerobic conditions. The treatment successfully removed H2S from the biogas with efficacies of 97% for the low concentration and 99% for the highest, in both cases achieving a concentration below 150 mg/Nm3. An optimal O2 rate of 6.4 NLO2/Nm3 of biogas when treating the biogas was found with 0.33% (v/v) of H2S and 118 NLO2/ Nm3 of biogas for the 3.38% (v/v) concentration. This relation may be employed to control the H2S content in the biogas while optimising the O2 supply.
必须对厌氧消化过程中产生的沼气中的 H2S 进行处理，以确保其潜在能量的高效持久利用。研究了微需氧条件下 H2S 的去除，以确定在沼气中低（0.33%v/v）和高（3.38%v/v）H2S 浓度下的处理能力，并确定实现 H2S 浓度为 150mg/Nm3 或更低的最佳 O2 速率。在中温条件下，使用 200L 工作体积的污水污泥中试规模消化器进行了研究，水力停留时间为 20d。向消化器的顶部空间以不同的速率供应 O2，以创造微需氧条件。处理成功地从沼气中去除了 H2S，低浓度时的去除效率为 97%，最高浓度时为 99%，在这两种情况下，H2S 浓度均低于 150mg/Nm3。当处理 0.33%（v/v）H2S 的沼气时，发现最佳 O2 速率为 6.4NLO2/Nm3 的沼气，而当处理 3.38%（v/v）H2S 的沼气时，最佳 O2 速率为 118NLO2/Nm3 的沼气。该关系可用于控制沼气中的 H2S 含量，同时优化 O2 的供应。
