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MET-PRO

BULLETIN DAS

DUALL

Environmental Air Solutions
A Met-Pro Product Recovery/Pollution Control Technologies Business

Degasification and
Air Stripping Systems
FOR

M U N I C I PA L WAT E R , I N D U S T R I A L WA S T E WAT E R ,
L E A C H AT E

AND

G R O U N D WAT E R T R E AT M E N T

Efficient and cost effective
answers to VOC removal,
degasification and odor
elimination
• Removes most VOC’s, ammonia, and
dissolved sulfides
• Capacities from 5 gpm to 5,000 gpm in
single column applications
• NSF-61 certified construction
• Options for exhaust air purification: BioPro
bioscrubbers, carbon adsorbers, and
chemical scrubbers
• Optional features include self-cleaning and
automatic monitoring for safer unattended
operation

Principles of Operation
Water containing volatile organic components (VOC’s), ammonia, hydrogen sulfide,
carbon dioxide, and/or radon is introduced
at the top of the degasifier. For example, dissolved sulfides in groundwater, consisting of
hydrogen sulfide gas, bisulfide, and sulfide
ions, are cost effectively removed by degasification. Spray nozzles or specially designed
weir troughs uniformly distribute the contaminated liquid. Packing and/or sieve trays
provide a large, turbulent surface area.
Ambient air is blown into the bottom of the
degasifier and, as it rises toward the outlet,
the hydrogen sulfide diffuses from the water
to the air because of the concentration differential. In this way, the hydrogen sulfide will
continue to transfer to the air stream in accordance with various chemical and mechanical
principles until equilibrium is approached. If
necessary, the hydrogen sulfide in the air can
be oxidized in an BioPro biological scrubber
or a Duall chemical scrubber to non-odorous,
non-toxic, and non-hazardous by products.