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Sewage (Biosolids) Treatment Plants
Sewage (or biosolids as we prefer to call it) treatment plants are certainly one of the more odoriferous sources, and one which we have plenty of experience with. Our first introduction to the incineration process was with the multiple hearths which then spread into fluidized bed incineration. As a side note we have performed extensive emissions testing on biofilter exhausts, which have been used for odor control from various fugitive emissions generated from the transport of biosolids.
Two identical multiple hearth incinerators recently completed of a major scrubber control upgrade and installed flue gas recirculation. Compliance emissions testing was performed for hazardous air pollutants (SW846 Method 0030-VOST), PCDD/PCDF (EPA M23), PCB, sulfuric acid, HCl, multiple metals, mercury, NOx, CO, and THC. Compliance with Title 40, CFR, Part 503 regulations was also verified.
Looking to further reduce their mercury emissions a fluidized bed incinerator operator installed a carbon (pellets) filter. Quarterly mercury tests (EPA M29 & 101A) are being performed to characterize bed life, the effects of moisture and temperature.
A multi-disciplinary compliance test program was performed on emissions from two biofilters. These side by side biofilters contained different media; emissions to the biofilters were from a composting facility. Hazardous air pollutants (EPA TO-14), total reduced sulfur (EPA M16), ammonia, and THC were tested in quadruplicate.