Hydrosciences Laboratory, Université Montpellier II, 
34095 Montpellier Cedex 05
France						                            
                            
						
 Research Article
												Aerobic Granules Formation in Dual-Layer Percolating Filters 						
Author(s): Christian Drakides and Meiling Lay-SonChristian Drakides and Meiling Lay-Son             
						
												
				 Aerobic spherical granules were observed in zeolitic dual-layer intermittent percolating ï»¿filters ï»¿treating domestic septic tank effluent. The diameter of the granules ranged from 0.05 to 0.5 mm and when they predominate in the biofilms the mean SVI value was of 54 ml g-1 instead of 232 ml g-1 when they were absent. Flow behavior in these filters was characterized by the dimensionless Reynolds number. The values obtained (40
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												DOI:
												 10.4172/2165-784X.1000112 
																	  
Journal of Civil and Environmental Engineering received 1798 citations as per Google Scholar report