Maunolr S.,Eparco |
Lequlen F.,Eparco |
Bavaveas S.,Eparco |
Eau, l'INDUSTRIE, les Nuisances | Year: 2011
6 Eparco Septic Tanks of 5 m3 have been installed and put into service in March 2001 on the Eparco platform situated in Mèze (34) and observed during 10 years under conditions of heavy overload. The influents treated are provided from a cluster of houses close to the platform. The influents showed average concentration of 281 mg/l (TSS) and 720 mg/l (COD), typical of a domestic effluent. The average hydraulic and organic loads applied during the 10 years were respectively l,92m3/day and 1304 g COD, i.e around 11 EH per tank. The follow-up of the treated effluents shows that each tank eliminates an average of 74% of the suspended solids and 52% of the COD. The average outlet values are of 70 mg/l (TSS) and 281 mg/l (COD). Those results are not dependant of the flow or of the height of the sludge within accepted limits of usage, the sizing of the tank offering a significant security margin for the settling process. The sludge accumulation shows a rate of less than 0,1 Uday.EH after 3 years of functioning. This is due to the anaerobic digestion (50 ml of CH4 produced by litre of sludge per day) which compensates for the solid biodegradable matter coming in. Hence the pump-out intervals regulated by a sludge level indicator can reach 25 years for 3 persons.
Vedry B.,Res Naturalis |
Maunoir S.,Eparco |
Eau, l'Industrie, les Nuisances | Year: 2012
On an experimental non-collective sewage treatment site connected to a community, the authors investigate the daily emission of the three figured elements of fecal origin in raw water, protein platelets, spiral vessels and cellulose fiber from toilet paper. They propose an indicative emission value per equivalent inhabitant (EI) for these three figured elements. What these three elements will become in the sewage tank is investigated and discussed.