Indicator organism levels in effluent from Queensland coastal STPs


The microbiological quality of the effluent from 33 sewage treatment plants (STPs) along the Queensland coast was investigated as part of a project to develop a quantitative model to assess the health risks associated with irrigating sugar cane with treated effluent. Initially a single sample, from each of the 33 STPs was tested to provide an indication of the microbiological quality of effluent available for irrigation use. Ten of these STPs, selected to give a range of effluent quality and treatment types, were then tested 4 to 6 times over a 12 month period to investigate in-plant variation. Microbial counts varied widely between and within STPs. Ranges for all 92 samples (with geometric means in brackets) were : thermo tolerant coliforms, 0 to 24,000,000(388) /100mL; Clostridium perfringens, 0 to 15,000 (90) /100mL; coliphages, 0 to 6,370 (4) /100mL; Cryptosporidium, 0 to 600

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University of Queensland eSpace

Last time updated on 30/08/2013

This paper was published in University of Queensland eSpace.

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