Septic tank effluent ste quality in pnrs ii biofilter performance evaluation the two highly important input factors are the composition of septic tank effluent ste and the system flowrates.
Quality of septic tank effluent.
However insufficient nutrient data is presently available to assess nutrient loads.
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Septic tank additives have been promoted by some manufacturers with the aim to improve the effluent quality from septic tanks reduce sludge build up and to reduce odors.
These additives which are commonly based on effective microorganisms are usually costly in the longer term and fail to live up to expectations.
Results from studies of septic tank effluent quality indicated that the effluent is of poorer quality than currently suggested by guidelines.
Quality of the discharged effluent.
Residential septic tank waste strength septic tank effluent will vary in quality according to the characteristics of the wastewater and condition of the tank.
Aerated wastewater treatment systems were found to perform to accreditation guidelines.
Effluent leaving a conventional septic tank one not equipped with an effluent filter typically has concentration of 150 to 250 mg l for bod 5 40 to 140 mg l for tss and 20 50 mg l for.
It has been verified in sample events 1 and 2 that target flow rates have been successfully achieved.