Bioremediation of Hydrogen Sulphide
Sulphur is of some interest in aquaculture because of its importance in anoxic sediments. In aerobic conditions, organic sulphur decomposes to sulphide, which in turn get oxidised to sulphate. Sulphate is highly soluble in water and so gradually disperses from sediments. Sulphide oxidation is mediated by micro organisms in the sediment, though it can occur by purely chemical processes (Boyd
1995). Under anaerobic conditions, sulphate may be used in place of oxygen in microbial metabolism.
This process leads to the production of hydrogen sulphide gas (Midlen et al. 1998). The H2S is produced by a series of microbially mediated reductions (Boyd 1995).