Graduate Institute of Environmental Engineering, National Central University, Chungli, 320, Taiwan.
Chemosphere. 2019 Jun;225:35-42. doi: 10.1016/j.chemosphere.2019.03.013. Epub 2019 Mar 4.
Emissions of PCDD/Fs and dl-PCBs from the combustion of PCB-containing oil in a hazardous waste incinerator are characterized. Flue gas samples are simultaneously taken at three points, including the outlet of ultrasonic wet scrubber, the outlet of heat exchanger and stack. In addition, solid matter samples including incinerator bottom ash, wet scrubber sludge, heat exchanger ash and baghouse ash are also collected. The results indicate that TEQ concentration (PCDD/Fs + dl-PCBs) measured in stack from the combustion of PCB-containing oil is 0.51 ng WHO-TEQ/Nm. For the solid matter, PCDD/F and dl-PCB concentrations of baghouse ash and wet scrubber sludge are significantly higher than those measured in bottom and heat exchanger ashes. The total removal efficiencies of PCDD/Fs + dl-PCBs achieved with bag filtration (BF) + activated carbon injection (ACI) reaches 65.0%. The emission factors of PCDD/Fs and dl-PCBs from incinerating PCB-containing oil are 1.05 and 0.08 ng WHO-TEQ/L, respectively. The overall PCDD/Fs and dl-PCBs destruction efficiencies achieved with fluidized-bed incinerator reach 99.87% and 99.9998%, respectively, which demonstrates that incineration is an effective engineering practice for treating PCB-containing oil. Moreover, this is the first study suggesting the ratios of PCB-114/(PCB-126+ PCB-114) and PCB-157/(PCB-169+ PCB-157) as indicators to distinguish the emission source of dl-PCB from combustion process and technical mixture evaporation in diagnostic ratio analysis.
研究了含多氯联苯油在危险废物焚烧炉中燃烧时二恶英/呋喃（PCDD/Fs）和共面多氯联苯（dl-PCBs）的排放情况。在三个点同时采集烟道气样品，包括超声湿式洗涤器出口、热交换器出口和烟囱。此外，还收集了包括焚烧炉底灰、湿式洗涤器污泥、热交换器灰和袋式除尘器灰在内的固体物质样品。结果表明，含多氯联苯油燃烧时从烟囱中测量的总毒性当量（PCDD/Fs + dl-PCBs）浓度为 0.51ng WHO-TEQ/Nm。对于固体物质，袋式除尘器灰和湿式洗涤器污泥中的 PCDD/F 和 dl-PCB 浓度明显高于底灰和热交换器灰中测量的浓度。袋式过滤（BF）+活性炭注入（ACI）的总去除效率达到 65.0%。焚烧含多氯联苯油的 PCDD/Fs 和 dl-PCBs 的排放因子分别为 1.05 和 0.08ng WHO-TEQ/L。流化床焚烧炉达到的总 PCDD/Fs 和 dl-PCBs 破坏效率分别为 99.87%和 99.9998%，这表明焚烧是处理含多氯联苯油的有效工程实践。此外，这是首次提出使用 PCB-114/(PCB-126+ PCB-114) 和 PCB-157/(PCB-169+ PCB-157) 比值作为指标，通过比值分析来区分燃烧过程和技术混合物蒸发中二噁英/呋喃（PCDD/Fs）和共面多氯联苯（dl-PCBs）排放源的来源。
