This study designed a PPWS to control low-concentration acid
gases using a MPPM in which the parallel plates are made of polypropylene
coated with nano-TiO2 particles to enhance hydrophilicity
for scrubbing liquid to form uniform liquid film. The gap
between the plates was maintained at 3 mm, providing channels
through which soluble gas pollutants in the upward gas stream
were absorbed by the downward scrubbing liquid film on the surfaces.
HCl, HNO3, and CH3COOH were tested for the gas removal
efficiency at different retention times and liquid-to-gas ratios.
The experimental removal efficiencies of the MPPM were further
compared with the theoretical values.