Stripping plant TS-ST series

EQUIPMENT TYPE
Stripping plant is composed with a stripping tower and a chemical
scrubber.

APPLICATION
The stripping plants TS-ST series are used for the treatment and
removal of a contaminant from ground or surface waters, from
landfill leachate or from liquid digestate from biogas plant. The
contaminant is transferred from the liquid phase to the gas phase (air
or steam), if required the air is treated in a second scrubber before his
expulsion into the atmosphere.

OPERATING PRINCIPLE
We build and sell columns for stripping gases dissolved in water, such as
carbon dioxide, ammonia and VOCs in general. The most common
application is using air to remove ammonia dissolved in water. Ammonia
air stripping is a process where the ammonia nitrogen is removed from
wastewater stream by an air stream in countercurrent flows.
The wastewater to be purified contains primarily dissolved ammonia
(NH3)L and ammonium ions (NH4+)L in a chemical equilibrium:
(NH3)aq + H2O <=> (NH4+)aq + OH- (1)
Another equilibrium present is that of ammonia gas solubility in water:
(NH3)g <=> (NH3)aq (2)
To reduce the concentration of (NH4+)L (to move the equilibrium (1) to
the left) we have several options:
– raising the operating temperature (heating the wastewater to
be treated and the air stripping);
– raising the pH of the wastewater to be treated (by adding a
basic solution to the wastewater);
– reducing the concentration (NH3)G (by mass transfer in the
column)
Our stripping Plants exploit all the possible options mentioned above: The
optimal air flow rate is calculated, the optimal operating temperature in
the stripping column and the optimal pH of the effluent to be treated are
determined. Then the diameter and the height of the column are
calculated in order to create all the necessary conditions for the transfer
of ammonia from the effluent liquid to the air during their contact along
the stripping column.
The air exiting from the stripping column is polluted by ammonia in the
gaseous phase, it will be treated in a second column with a chemical
washing, using the sulphuric acid H2SO4 to get a salt (solution of
ammonium sulphate (NH4)2SO4) which has a commercial value in the
production of fertilizer industries.
MAIN ADVANTAGES
Stripping plant TS-ST series is applied both for low and for high
concentrations of pollutants (from 2 to 5000 ppm)
He hasn’t problems of clogging
He hasn’t problems of discharges management
Low energy consumption
Low investment cost