One of the usual parameters for emission monitoring of stationary sources is particulate matter (PM).
As based on the National Emission Standards for Source Specific Air Pollutants (NESSAP) which is incorporated in the Implementing Rules and Regulations (IRR) of the Philippine Clean Air Act (CAA), the maximum permissible limit of PM emission concentration for fuel burning equipment such as generator sets, boilers, fire pumps and the likes in an urban and industrial areas, cement plants and smelting furnaces is 150 mg/NCM. For other stationary sources and fuel burning equipment not located in urban and industrial areas, the maximum permissible limit is 200 mg/NCM.
PM emission concentration exceedance to the standard is a problem to some industries. One of the most practical and basic solution to this problem is regular cleaning and maintenance of the chimney or exhaust stack and the equipment itself. Soot and other particles accumulated in the exhaust can contribute to the particulate emission.
Another thing to check is the exhaust stack diameter and sampling porthole location. These equipment specifications contribute to the concentration of the particles collected during emission sampling. Exhaust stacks should conform to design standards so that an accurate and representative PM concentration will be generated from the emission sampling.
For fuel-burning equipment using coconut husks, wood chips or paper, PM emission concentrations can be normally high. If fuel substitution is not an option, gravity settling chambers, mechanical collectors, particulate wet scrubbers, electronic precipitators and fabric filters will be the solution.
These air pollution control equipment are usual fixtures in cement industries for and the same can be used by other industries to regulate their particle emissions. Technical evaluation and assessment will be needed to determine which air pollution control equipment will best suit the system.
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