Our experience in reducing air emissions--in particular, odorous compounds and airborne particulates--includes process studies, detailed design, installation and troubleshooting.
Airborne particulates
Recent particulate emission assignments have ranged from the provision of design and installation services for single- and dual-chamber electrostatic precipitators at a number of mills, to a turnkey cogeneration project (see Woodwaste Cogeneration) spurred in part by new regulations phasing out beehive burners. The project addressed the mill's needs for increased power and reduced airborne particulate emissions by providing for woodwaste incineration using a bubbling fluidized bed boiler.
Odor reduction
In the field of odor reduction, a $16 million assignment for a mill in western Canada was successful in significantly reducing odor. The project included foul condensate segregation and stripping, collection and scrubbing of non-condensible gases, and collection of digester chip bin gases, with incineration in the power boiler, lime kiln and recovery boiler.
Another odor reduction project involved revamping a concentrated non-condensible gas system and installing a new NCG scrubber designed to improve on the normal TRS capture efficiency.
Useful innovations
Our involvement in air emission reduction has produced some small but useful innovations. We have developed a program to quantify, reliably and quickly, the fossil fuel requirements in dedicated incinerators for odorous gases; and our addition of an oxidant to a scrubber for odorous gases increases the proportion of captured TRS compounds.
