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Septic waste has been usually treated with night soil, but the condition of the night soil treatment goes bad by degrees when a large quantity of the septic waste is added to night soil. Therefore exclusive operating facilities for the septic waste have come into construction in recent years, however, facilities have been constructed, are not many up to now so far as we know.<BR>There are some effectsof the studies on the treatment of septic waste we have carried out by use of recirculating aeration and contact aeration processes with Alum coagulation process.<BR>As to the characteristics of effluents from the facility we have operated, BOD values ranged from 4.4 to 1.6 mg/l and suspended solids values ranged from 4.4 to 2.9 mg/l
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