Energy Recovery and Emissions of PBDD/Fs and PBDEs from Co-combustion of Woodchip and Wastewater Sludge in an Industrial Boiler
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文摘
The emissions of polybrominated dibenzo-p-dioxins, dibenzofurans (PBDD/Fs), and polybrominated diphenyl ethers (PBDEs) from trial combustion of 10 wt % dried industrial-wastewater-treatment sludge (IWTS) and 90 wt % woodchip in an industrial boiler were investigated and compared to that from woodchip combustion. The PBDD/F toxic equivalent (TEQ) and PBDE emissions increased from 0.121 pg TEQ Nm鈥? and 2260 pg Nm鈥?, respectively, of the woodchip combustion to 0.211 pg TEQ Nm鈥? and 4200 pg Nm鈥?, respectively, of the trial combustion. PBDD/F and PBDE congener profiles of inputs and outputs of the same type of combustion were similar; they also show similarity between woodchip and trial combustions, revealing that the destruction pathway was little affected by the introduction of the IWTS. The fates of PBDD/Fs and PBDEs show that the indigenous pollutants in the feed were effectively depleted (>93.5%). The dominant releasing route of PBDD/F and PBDE shifted from the stack flue gas of woodchip combustion to the ashes of trial combustion. This study demonstrates that co-combustion not only handles the fast growing sludge stream but also yields a saving of 26.3% in the fuel cost and treatment fees of sludge and ashes.

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