Typical MultiPhase Biofilter System
Configuration to Treat VOC Contaminants
- The MultiPhase Biofilter treats VOC contaminants in the liquid phase and gas phase in
which the VOC would naturally reside as determined by its inherent physical properties.
- Highly volatile compounds that exhibit low water solubility are treated mainly in the
gas phase, using proven synthetic media design.
- Low volatility compounds that are water-soluble are treated mainly in the
water phase of the biofilter.
- Intermediate compounds are treated in both phases of the biofilter system.
A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air stream enters from the VOC source or multiple sources such as dryer and press.
The MultiPhase biofilter system can accept a very wide spectrum of VOC compounds
from a wide range of sources.
B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ductwork is sprayed by water recycled from the digester sump. This humidifies the air, puts the water-soluble VOCs into solution, removes bulk particulate, and keeps the ductwork clean.
C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water, water-soluble VOC, and bulk particulate are collected before and after
the fan and sent directly to the digester sump.
D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VOCs in the gas phase enter the central duct and flow downward into the vessel.
E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The gas phase VOC in the air is drawn upwards through the biofilter media bed, which consists
of proprietary randomly packed ceramic biomedia. Bacteria films thrive on the biofilter media
and consume the VOC. The biofilter media is continuously washed down by water recycled
from the digester sump. This provides additional food for the bacteria, especially during
shutdown, and keeps the bed free from excess build-up of biofilter mass that occurs as the
bacteria consume the VOC and multiply.
F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The water in the digester sump of the biofilter system is full of bacteria that consume
water-soluble VOC. Special neutrally-buoyant media provide extra surfaces for the
bacteria films, multiplying by severalfold the density of bacteria able to thrive in the digester.
Complex VOC are in the digester for several hours being decomposed and consumed.
G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ambient air is introduced into the bottom of the biofilter digester. This prevents settling of solids
in the vessel, cools the sump, and provides extra oxygen that “revs up” the bacteria.
H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A low volume stream of water from the digester is filtered. This prevents build-up in the
digester by removing particulate, fibers, and other non-digestible debris. Recycled water
is also used to spray the ducts, keep the biofilter media clean, and provide bacteria
food and water.
I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clean, non-hazardous solids are removed from the biofilter system. These can be landfilled,
burned for their fuel value, or otherwise disposed of.
J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
If any stripping of gas-phase VOC occurs in the digester sump of the biofilter system,
this air also flows upward through the ceramic biomedia and is exposed to the bacteria films.
Treated air exits the stacks.
Interested in a cost-saving alternative to a traditional biofilter
to treat VOC contaminants?
Tell us about it . . . we can help you with some guidelines. Download MultiPhase Biofilter brochure For more information contact:
Kevin Moss (801) 294-5422
kevin.moss@tri-mer.com PRD Tech, Inc.
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