نتایج جستجو برای: sewerage
تعداد نتایج: 724 فیلتر نتایج به سال:
1997
Karim Alibhai
Arthur Boon
Alison Vincent
Jenny Williams
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 an...
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