F SANITATION AND WASTE: ALIBHAI, BOON, VINCENT and WILLIAMS
نویسندگان
چکیده
SEPTICITY WITHIN A sewerage system occurs when microorganisms present in sewage and adhering to submerged surfaces have utilised all the dissolved oxygen and any nitrates that may be present in the sewage (derived from ground-water infiltration or present in the water supply). When anaerobic conditions have developed, bacteria in the sewage reduce the organic compounds of sulphur to sulphide and subsequently the sulphate-reducing bacteria utilise sulphates, as an alternative electron acceptor for the dissimilation of organic matter, and form sulphides. The consequences of sewage septicity are important for two critical reasons:
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