Methods and Apparatuses for Removal of Hydrogen Sulfide and Carbon Dioxide from Biogas
a technology of biogas and hydrogen sulfide, which is applied in the field of methods and apparatuses for removing hydrogen sulfide and carbon dioxide from biogas, can solve the problems of adversely affecting human health, affecting human health, and affecting human health, so as to reduce capital and maintenance costs, reduce maintenance costs, and simple
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example 1
[0327]The aim of these experiments was to determine the selectivity of H2S over CO2 from biogas as well as the H2S removal efficiency of an alkaline effluent, produced as a by-product of anaerobic digestion and nutrient recovery, as a function of sparger design, effluent height in the reactor and superficial gas velocity.
[0328]Materials and Methods
[0329]A. Nutrient Recovery Process
[0330]Anaerobically digested dairy effluent was obtained from a dairy processing manure from 5,000 cows via a mesophilic complete mixed plug flow digester (DVO Inc., Chilton Wis.), with a hydraulic retention time of around 21 days. Fiber was separated from the effluent with a slope screen, 0.5 cm mesh (US Farms, Tulene, Calif., USA). The effluent was stored in plastic buckets at 15-20° C. in a temperature controlled room.
[0331]The pretreatment of the effluent, depicting a NH3 stripping process (Zhao et al., 2012), involved extended physical aeration (˜46 L·min−1) of post AD / fiber-separated dairy manure at ...
example 2
[0347]This experiment was designed to investigate the effects the height of the bubble column would have on H2S removal.
[0348]The G / L ratio at 95% H2S removal was further enhanced by decreasing the effluent height in the reactor. The effluent heights tested were 0.072, 0.13, 0.27, 0.42, and 0.48 m. The superficial gas velocity was held constant at 0.0073 m·s−1. Since a significant increase in the selectivity resulted from the use of the inlet orifice in the previous sparger experiment, the same diameter inlet orifice was used as the gas injector in the remainder of experiments.
[0349]FIG. 11 graphically illustrates how the effluent height affects the H2S removal efficiency as function of G / L ratio. At a height of 0.072 m the G / L ratio achieved roughly 21:1, while at an effluent height of 0.48 m the G / L ratio dropped to roughly 12:1. An increase of 43% on the G / L ratio, at a removal efficiency of 95%, resulted by decreasing the effluent height.
example 3
[0350]This experiment was designed to investigate the effects gas velocity would have on H2S removal.
[0351]The G / L ratio at 95% H2S removal was also enhanced by increasing the superficial gas velocity. The superficial gas velocity was altered while the effluent height was kept constant at 0.27 m. The superficial gas velocities tested were 0.0022, 0.0037, 0.0073, 0.011, 0.015 m·s−1.
[0352]FIG. 12 graphically illustrates how the superficial gas velocity affects the H2S removal efficiency as function of G / L ratio. An increase in the G / L ratio at 95% H2S removal resulted from 0.002 to 0.015 m·s−1. The G / L ratio at 95% removal increased from around 12:1 to 17:1, which is equivalent to a 29% increase in the amount of biogas that can be purified per effluent.
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