Results show that when the retention time was 0.5 s, the
removal efficiency of the PPWS for HCl, HNO3, and CH3COOH of
0.02–2 ppmv was greater than 91%, 95%, and 98%, respectively.
The MPPM significantly enhances the removal efficiency of the
PPWS, especially for low inlet concentration ranging from 0.02 to
1 ppmv. The removal efficiency of the PPWS greater than 95%
and close to 100% for HCl and HNO3 and 93% for CH3COOH was
achieved at Ql/Qg = 3.7 L/m3 when the inlet concentration is less
than 1 ppmv. The MPPM is shown to be able to effectively enhance
the absorption of acid gases in low concentration as compared to
the typical tower packing materials. The experimental removal
efficiencies of the MPPM are also in good agreement with theoretical
predictions.