Kinetics and mechanisms of hydrogen sulfide adsorption by biochars

Shang, Guofeng; Shen, Guoqing; Liu, Liang; Chen, Qin; Xu, Zhiwei

doi:10.1016/j.biortech.2013.01.114

Cited by 93 publications

(28 citation statements)

References 25 publications

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“…The green waste-derived biochar recorded the second highest breakthrough capacity (6.5 g S/kg medium). While this value was within the wide range measured by Shang et al (2012) (1.1-114 g S/kg medium) for camphor derived biochar, it was considerably lower than the capacities reported by Shang et al (2013) which ranged from 109 to 383 g S/kg medium for biochars derived from agricultural/forestry wastes products such as camphor, rice hulls and bamboo. Others have reported on engineered GAC which has been impregnated with caustic compounds (Siefers, 2010;Abatzoglou and Boivin, 2009) such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), sodium bicarbonate (NaHCO 3 ) and sodium carbonate (Na 2 CO 3 ) or strong oxidising agents such as potassium permanganate (KMnO 4 ).…”

Section: 2supporting

confidence: 37%

Low-cost filter media for removal of hydrogen sulphide from piggery biogas

Skerman¹,

Heubeck

Batstone

et al. 2017

Process Safety and Environmental Protection

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Section: 2supporting

confidence: 37%

Low-cost filter media for removal of hydrogen sulphide from piggery biogas

Skerman¹,

Heubeck

Batstone

et al. 2017

Process Safety and Environmental Protection

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“…Shang et al [18] stated that the H 2 S breakthrough capacity is also governed by the local pH within the pore system.…”

Section: Breakthrough Capacitymentioning

confidence: 99%

Biochars as Potential Adsorbers of CH4, CO2 and H2S

et al. 2017

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Methane gas, as one of the major biogases, is a potential source of renewable energy for power production. Biochar can be readily used to purify biogas contaminants such as H 2 S and CO 2 . This study assessed the adsorption of CH 4 , H 2 S, and CO 2 onto four different types of biochars. The adsorption dynamics of biochars were investigated in a fixed-bed column, by determining the breakthrough curves and adsorption capacities of biochars. The physicochemical properties of biochars were considered to justify the adsorption performance. The results showed that CH 4 was not adsorbed well by the subjected biochars whereas CO 2 and H 2 S were successfully captured. The H 2 S and CO 2 breakthrough capacity were related to both the surface adsorption and chemical reaction. The adsorption capacity was in the following order: perilla > soybean stover > Korean oak > Japanese oak biochars. The simultaneous adsorption also leads to a competition of sorption sites. Biochars are a promising material for the biogas purification industry.

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“…The green waste-derived biochar showed the second highest breakthrough capacity (6.5 g S/kg medium, Table 3.2). While this value was within a wide range of values reported by Shang et al (2012) (1.1 to 114 g S/kg medium) for camphor-derived biochar, it was considerably lower than the capacities reported elsewhere by Shang et al (2013) (109 to 383 g S/kg medium) for biochars derived from agricultural/forestry waste products, such as camphor, rice hulls and bamboo. Others have reported on engineered GAC which has been impregnated with caustic compounds (Siefers, 2010;Abatzoglou and Boivin, 2009) such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), sodium bicarbonate (NaHCO3) and sodium carbonate (Na2CO3), or strong oxidising agents such as potassium permanganate (KMnO4).…”

Section: Media Propertiessupporting

confidence: 47%

Practical options for cleaning biogas prior to on-farm use at piggeries

Skerman¹

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Interest in the use of biogas from anaerobic digestion has been increasing within the Australian pork industry in recent years, driven by a significant potential for biogas use to buffer rising energy costs and to reduce carbon emissions from individual piggeries and across the whole pork industry. A recent life cycle assessment study suggested that a 64% reduction in piggery GHG emissions could be achieved by installing biogas capture and use systems. Further Government incentives have also contributed to the growing interest in on-farm biogas.One of the major obstacles to adoption of on-farm biogas technology in the Australian pork sector is the presence of relatively high concentrations of hydrogen sulphide (H2S) in raw piggery biogas, commonly in the range of 500 to 3000 ppm. Smelling like rotten eggs, H2S is highly toxic and corrosive. Exposure to H2S, even at relatively low concentrations, can result in severe human health impacts, while corrosion and increased maintenance of biogas use equipment necessitates some form of biogas treatment to remove H2S to suitable levels.Many of the existing biogas treatment technologies used in other industries are not ideally suited for on-farm application in the Australian pork industry, because on-farm systems must be relatively simple, low-cost, safe, robust and scalable, producing minimal hazardous waste products. However, a literature review, which examined various existing biogas purification technologies, identified biological oxidation of H2S and chemisorption with iron-based solid media as potential options for piggeries, provided that some key research and development gaps could be addressed. A particular issue with regard to chemisorption was the high cost of replacing commercial chemisorption medium (accounting for up to 5% of the savings derived from biogas use). Of further interest was the observation that the active components in commercial chemisorption media were also relatively common in natural materials such as soils, and even in some agricultural and industrial waste and by-products. However, such alternative chemisorption media required targeted laboratory and on-farm testing. With regard to biological oxidation, there was a need to determine whether the treated effluent outflow from a covered anaerobic lagoon could be used as a viable nutrient source in an external packed column system. This concept required testing on-farm.(ii)To assess chemisorption options, a detailed and carefully designed laboratory study tested and compared the H2S removal capacity of a commercial iron-based medium (cg5) with that of a range of low-cost alternative media. The results of these trials indicated a far superior performance of a commercial cg5 medium, probably due to its engineered high porosity and high iron content (the active ingredient). However, a locally sourced red soil was a potentially feasible alternative medium, with reasonable chemisorption capacity and likely low cost and ready availability, depending on the piggery locality. While the pressur...

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Kinetics and mechanisms of hydrogen sulfide adsorption by biochars

Cited by 93 publications

References 25 publications

Low-cost filter media for removal of hydrogen sulphide from piggery biogas

Low-cost filter media for removal of hydrogen sulphide from piggery biogas

Biochars as Potential Adsorbers of CH4, CO2 and H2S

Practical options for cleaning biogas prior to on-farm use at piggeries

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