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Hydrogen sulphide gas production from spent mushroom compost under field and laboratory conditions
Velusami, Balasubramanian; Adjeh, Bolanle; Curran, Thomas P.; Grogan, Helen
7th International Conference on Mushroom Biology and Mushroom Products (ICMBMP7) 2011, Arcachon, France, October 4-7, 2011 Hydrogen sulphide (H2S) gas production was monitored during the disturbance of four heaps of Spent Mushroom Compost (SMC) that were stored for up to 12 months either outdoors or under cover (indoors). QRAE (www.raesystems.eu) and ITX (www.indsci.com) gas monitors with data logging facilities were used to measure the 10-second average concentration of H2S released into the air above the heaps of SMC as they were being disturbed. The highest concentrations of up to 2083 ppm were detected for the outdoor stored material in comparison to concentrations of up to 687 ppm detected for indoor stored material. Outdoor stored SMC had higher moisture contents (66-72%) compared to indoor stored material (53-65%). Laboratory studies were conducted to study the effects of moisture content (69 – 85%) and temperature (35ºC or 45ºC) on H2S production from fresh un-steamed and steamed samples of SMC. The H2S gas concentration in the head space of the incubation vessels was measured every 24 hours for 3 days. Un-steamed SMC produced higher levels of H2S than steamed SMC and in general the higher the moisture content the higher the H2S concentration. Higher concentrations of H2S were also produced with the higher incubation temperature of 45 ºC. These results suggest that the high levels of H2S detected during disturbance of stored SMC are heavily influenced by moisture content. The higher rates of H2S production at 45 ºC also suggest that thermophilic microorganisms are involved in the process. Health and Safety aspects of H2S production from stored SMC are discussed AD 08/01/2014
Keyword(s): Hydrogen sulphide; Spent mushroom compost; Health and safety
Publication Date:
2014
Type: Other
Peer-Reviewed: Unknown
Language(s): English
Institution: University College Dublin
Publisher(s): INRA
First Indexed: 2014-01-10 05:16:19 Last Updated: 2018-10-11 15:21:35