Problem 1
Estimate the amount of influent nitrogen which will end up being
consumed by the `organotrophic' (i.e., CBOD consuming) fraction
of the MLVSS in this initial reactor system. You should assume
that there is 'NO' nitrification taking place in this first
activated sludge reactor.
Problem 2
Develop a preliminary design for a subsequent (following
the aforementioned reactor in series) fixed-film nitrification
reactor (two each in parrallel), based on an ammonium-nitrogen
loading of 1 pound N per 12,000 sq.ft. media surface area per day
(i.e., determine the necessary reactor diameters assuming
a tank media of 20 feet). You should also assume that the
media to be used will have a specific surface area of 45 sq.ft.
per cu.ft. of media volume (a somewhat conservative figure,
as compared to media values which can be obtained as high
as 60, but less apt to clog and foul due to unexpected
excessive biofilm growth).
Problem 3
Would this system likely have enough aeration horsepower
Develop a second preliminary design for an optional 'IDI Biofor'
system assuming an ammonium-nitrogen loading of 2.0 kg N per
cu.meter (of tank volume) per day. In this case, you
should estimate the width and length (at a respective 2:1 ratio) dimensions
(in meters) for the single 'Biofor' reactor with a media depth
of 3.5 meters.