Underground metal mine air quality measurements to determine the control efficiencies of combined catalyzed diesel particulate filter and oxidation catalytic converter systems.
Johnson JH; Carlson DH; Bagley ST; Gratz LD
Appl Occup Environ Hyg 1996 Jul; 11(7):728-741
Efforts were made to determine the concentration of diesel particulate matter (DPM), carbon-monoxide (630080), carbon-dioxide (124389), nitric-oxide (10102439), nitrogen-dioxide (10102440), and sulfur-dioxide (7446095), the air quality index (AQI) and exhaust quality index (EQI) in two metal mines using diesel powered haulage vehicles. At the same time efforts were made to determine the control efficiencies of the properly working catalyzed diesel particulate filter (CDPF) and the CDPF combined with an oxidation catalytic converter (OCC) and compare the effects on DPM and other pollutants from mine ambient air and tailpipe measurement. The chemical and biological characteristics of the DPM with the control devices off and on were evaluated by quantifying levels of selected key PAH compounds and mutagenic activity. Replacing the OCC normally used with the combined CDPF and OCC reduced DPM concentrations by 61% at the LDH location in one mine and by 82% in a second. Replacement of the OCC with the combined CDPF and OCC reduced DPM concentrations by 95% in a test using EMA parked vehicle tailpipe measurements on a LDH vehicle with the engine loaded at the torque converter stall load and speed condition. Use of the combined system reduced by 63% the DPM concentrations generated by an EMA parked vehicle tailpipe measurements on the mine-T bolter with the engine operated at the high idle condition used during bolting. Concentrations of gaseous pollutants were not significantly affected by replacing the OCC with the CDPF plus the OCC or by the CDPF alone. EQI was reduced by 85% and AQI by 32% calculated from the mine-Q LHD vehicle tail pipe measurements. Replacement of an OCC with the combined CDPF and OCC increased DPM associated mutagenic activity by at least 100% in mine-Q, while replacement with the CDPF alone decreased mutagenic activity by 99% in mine-T.
NIOSH-Publication; NIOSH-Grant; Control-technology; Airborne-particles; Coal-dust; Mining-equipment; Diesel-exhausts; Air-quality-monitoring; Air-sampling-equipment
Biological Sciences Michigan Technological Univ. Dept. Biological Sciences Houghton, MI 49931
630-08-0; 124-38-9; 10102-43-9; 10102-44-0; 7446-09-5
Applied Occupational and Environmental Hygiene
Michigan Technological University, Houghton, Michigan