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Complete Secondary
Treatment
MARPAK MXF Series fixed film
biological reactors used in
conjunction with primary and
secondary clarification (Fig. 8-1)
can reduce BOD
5
and suspended
solids to above 90%.
Trickling Filter/
Solids Contact
(TF/SC)
The TF/SC process utilizes the trickling
filter followed by short term aeration
(Fig. 8-2). The recirculation of sludge to
the aerated contact basin enhances the
agglomeration of fine particles and
improves settling characteristics. At the
same time the aeration continues to
remove soluble organics. The aerated
contact basin, combined with a center-well
final clarifier can readily achieve a 95-plus
percentage reduction in BOD
5
and total
suspended solids.
Roughing or Pretreatment
MARPAK MXF and MCR Series fixed film
biological reactors (Fig. 8-3) are an effective
method of pretreating difficult wastes and
reducing the organic load on subsequent
biological treatment steps.
Secondary
Clarifier
MARPAK
Reactor
BOD –20
SS –20
8-1
Complete Secondary Treatment
Primary
Clarifier
Aerated
Contact
Basin
Aerated
Contact
Basin
Secondary
Clarifier
MARPAK
Reactor
BOD – 10
SS – 10
8-2
TF/SC Process
Primary
Clarifier
Circulated
Sludge
Waste
Sludge
Aeration
Basin
Aeration
Basin
Secondary
Clarifier
MARPAK
®
Reactor
BOD – 20
SS – 20
8-3
Primary
Clarifier
Marpak Plus Activated Sludge