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12

Emerging Air Pollution Control Technologies

Lawrence K. Wang, Jerry R. Taricska,
Yung-Tse Hung and Kathleen Hung Li

CONTENTS
INTRODUCTION
PROCESS MODIFICATION
VEHICLE AIR POLLUTION AND ITS CONTROL
MECHANICAL PARTICULATE COLLECTORS
ENTRAINMENT SEPARATION
INTERNAL COMBUSTION ENGINES
MEMBRANE PROCESS
ULTRAVIOLET PHOTOLYSIS
HIGH-EFFICIENCY PARTICULATE AIR FILTERS
TECHNICAL AND ECONOMICAL FEASIBILITY OF SELECTED EMERGING
TECHNOLOGIES FOR AIR POLLUTION CONTROL
NOMENCLATURE
REFERENCES

1. INTRODUCTION

The previous chapters discussed the principal technologies whereby the emissions of
gaseous and particulate air pollutants can be controlled. Other control technologies also
exist, and some of these are briefly presented in this chapter along with a discussion on
vehicle air pollution and its control.
These additional control technologies may serve as the principal means of pollutant
abatement or in a secondary role to augment the performance of other pollution control
technologies. This secondary role is usually played either in a pretreatment step (i.e.,
prior to the main control process or technologies, as in the case of gravity separators
being utilized to remove heavier particulates prior to a fabric filtration step) or in a post-
treatment step (i.e., after the main control process or technologies, as in the case of
entrainment separators being utilized to remove scrubbing liquid escaping with cleaned
gases from gas scrubbers). Such supportive control systems as used for pre-treatment
and post-treatment purposes should never be underestimated in their contribution to the

From: Handbook of Environmental Engineering, Volume 1: Air Pollution Control Engineering
Edited by: L. K. Wang, N. C. Pereira, and Y.-T. Hung © Humana Press Inc., Totowa, NJ
445