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EMISSIONS FROM GREEN FIR COMBUSTION    Tested by OMNI Environmental Laboratories for Bonneville Power Administration & USDOE, as reported in the BPA report, Environmental Impacts of Advanced Biomass Combustion Systems, 1988.    Tests were performed using green fir sawdust @44% moisture in a prototype cookstove model named "Helen" designed by Larry Dobson.    Due to very low draft caused by extremely hot summer test conditions, the maximum burn-rate of 50,000 Btu/hr (14.7Kw) was not achieved during these tests       Likewise, the low-burn of estimated 8,000Btu/hr was forced to be prematurely terminated when flue gases became cooler than the outside temperature (95°F), creating a negative draft.

 @14,000 Btu/hr            @ 21,000 Btu/hr

                                                             (4Kw) Output                (6Kw) Output

PARTICULATE EMISSIONS

        g/hr                                                            0.28                             0.23

        ng/Joule                                                   20                                  9

        Grains/DSCF                                             0.018                           0.008

CARBON MONOXIDE EMISSIONS

        g/hr                                                            0.61                             0.07

        g/Kg                                                           0.65                             0.04

        ppm                                                       160                                  4

NOx EMISSIONS

        ppm (actual)                                                                                50

        ppm @3%O2                                                                               81

SO2 EMISSIONS were not detectable

VOC EMISSIONS (mg/cu. meter)

        Methane                                                     1                              ND

        Benzene                                                     1                                  9

        Total HC                                                  25                                15

PAH EMISSIONS (mg/hr)                        98.9                             99.1

ACIDITY of Condensed Emissions

        effective pH                                               4.8                               4.4

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