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On-farm trials of practical options for hydrogen sulphide removal from piggery biogas

Skerman, A. G., Heubeck, S., Batstone, D. J. and Tait, S. (2018) On-farm trials of practical options for hydrogen sulphide removal from piggery biogas. Process Safety and Environmental Protection, 117 . pp. 675-683. ISSN 0957-5820

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Article Link(s): https://doi.org/10.1016/j.psep.2018.06.014

Publisher URL: http://www.sciencedirect.com/science/article/pii/S095758201830332X

Abstract

Manure-derived biogas is increasingly used at Australian piggeries to produce heat and generate electricity. However, high concentrations of hydrogen sulphide (H2S) in piggery biogas is discouraging further use, because of a lack of practical, cost-effective H2S removal options. To address this issue, on-farm trials were conducted at two piggeries. One trial tested H2S oxidation; adding small amounts of air to biogas, upstream of a low-cost enhanced surface treatment vessel which was fabricated on-farm with intrinsic safety measures. Covered anaerobic pond (CAP) effluent provided a convenient, low-cost nutrient source for the biofilm of naturally-occurring microorganisms in the packed column. This treatment was effective, removing over 90% of the H2S in a single pass and reducing H2S concentrations from 4000ppm to <400ppm. Another trial tested chemisorption performance of natural, iron-rich red soil, mixed with a ground sugar cane mulch bulking agent, in comparison with cg5 commercial media (iron-oxide pellets). The red soil removed H2S, but had a substantially lower capacity (∼2gS/kg red soil) than the cg5 (∼200gS/kg media). Accordingly, red soil is unlikely to be feasible as a primary treatment medium, but may be useful for final polishing after an oxidation step has removed most of the H2S.

Item Type:Article
Business groups:Animal Science
Keywords:Biogas Hydrogen sulphide Iron oxide Micro-aeration Pig Manure
Subjects:Agriculture > Agriculture (General) > Agriculture and the environment
Agriculture > Agriculture (General) > Agricultural structures. Farm buildings
Animal culture > Housing and environmental control
Deposited On:14 Aug 2018 02:45
Last Modified:14 Aug 2018 02:45

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