Waste-Water Treatment by Infiltration-Percolation on Sand: Results in Ben Sergao, Morocco

Waste-water from Ben Sergao (Morocco) is treated by a process using infiltration on sand which includes an anaerobic lagoon (1500 m3) in which waste-water has a retention time of 1.4 days followed by 5 infiltration basins (1500 m2 each). Each basin comprises by a 2 meter thick sand dune layer. The b...

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Bibliographic Details
Published in:Water science and technology 1993-01, Vol.27 (9), p.91-95
Main Authors: Guessab, M, Bize, J, Schwartzbrod, J, Maul, A, Morlot, M, Nivault, N, Schwartzbrod, L
Format: Article
Language:English
Subjects:
Anaerobic lagoons
Anaerobic processes
Basins
Coliforms
Drains
Eggs
Faecal coliforms
Fecal coliforms
Gravel
Infiltration
Nitrogen dioxide
Parameters
Parasitology
Percolation
Physicochemical processes
Physicochemical properties
Raw wastewater
Retention time
Rural areas
Sand
Sewage
Sewage disposal
Sewage treatment
Suspended matter
Treated sewage
Treated water
Wastewater treatment
Water
Water treatment
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Summary:Waste-water from Ben Sergao (Morocco) is treated by a process using infiltration on sand which includes an anaerobic lagoon (1500 m3) in which waste-water has a retention time of 1.4 days followed by 5 infiltration basins (1500 m2 each). Each basin comprises by a 2 meter thick sand dune layer. The basins are drained at their base through a network of gravel-embedded drains. Three 350 m3 batches are performed daily. These are received in 3 separate basins. Each basin receives one batch a day during 3 days and is then left to rest for 2 days before carrying out a new cycle. It has been estimated that the treatment induced a decrease of 99.93 % for the fecal coliforms and 99.98 % for the fecal streptococci. Concerning the parasitology, neither nematode eggs nor cestode eggs were found in treated sewage even though their number in raw waste-water could be estimated respectively to be 139 and 75 per liter. As for physicochemical parameters, no significant difference appears between raw and treated sewage for K, P and conductivity, but there is a very significant increase of parameters NO2 and NO3 and a very important decrease of COD and total suspended matter after treatment. This treatment process seems to be very well adapted for the treatment of sewage and the reuse of treated water in rural areas.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.1993.0182