Patent ID: 7510649
Filing Date: 2009-03-31
Classification: C02F,Y02W,Y10T

Abstract:
1. Apparatus for treating wastewater comprising: (a) a wastewater supply source; (b) at least one treatment bed comprising: (c) an inflow control device operatively connecting said wastewater supply source to said distribution pipes so that said wastewater percolates through said particulate material to said collections pipes; and (d) an outflow control device operatively connected to said collection pipes for conveying percolated wastewater from said collection pipes out of said treatment bed, wherein said outflow control device includes a vertical flow control pipe operatively connected to said collection pipes, said vertical flow control pipe having a plurality of vertically spaced outlets that can be selectively opened and closed for controlling the level of wastewater in the treatment bed and thereby selectively controlling the treatment time of the wastewater passing through the treatment bed.