Chang M B, Wu H T, Huang C K
Graduate Institute of Environmental Engineering, National Central University, Chungli, Taiwan, PR China.
Sci Total Environ. 2000 Feb 10;246(2-3):165-73. doi: 10.1016/s0048-9697(99)00456-8.
Two large-scale municipal solid waste incinerators (MWIs) located in Taiwan were selected for conducting flue gas sampling to determine the chemical speciation of mercury by both USEPA Method 29 and Ontario Hydro Method (OHM). In addition, the emission characteristics and removal efficiencies of mercury were evaluated via isokinetic sampling of flue gas upstream and downstream of APCDs. Results indicated that the average removal efficiencies of Hg for MWI-A and MWI-B were 29.56 and 44.70%, respectively. In terms of mercury speciation by USEPA Method 29 and Ontario Hydro Method (OHM), oxidized mercury (Hg2+), in the flue gas was predominant at the inlet of APCD for both incinerators. Less than 30% of mercury in the flue gas existed in the elemental form (Hg0) at APCD inlet. Mercury emitted from the stack also predominated as a form of Hg2+ in MWI-A. Approximately 90% of total mercury emission from the stack existed in the form of Hg2+ for MWI-A. Due to the higher removal efficiency of soluble mercury (Hg2+) in wet scrubber, less total Hg was actually emitted from MWI-B than MWI-A. Regarding the removal efficiency of Hg0 in the flue gas, the APCDs of MWI-A (DSI + FF) had a higher removal efficiency than that of MWI-B (ESP + WS) possibly due to the reduction of Hg2+ which occurred in the wet scrubber.
选取了台湾的两座大型城市固体废弃物焚烧炉（MWIs）进行烟气采样，以采用美国环保署方法29和安大略水电法（OHM）测定汞的化学形态。此外，通过对空气污染控制装置（APCDs）上下游烟气的等速采样，评估了汞的排放特征和去除效率。结果表明，MWI-A和MWI-B对汞的平均去除效率分别为29.56%和44.70%。就采用美国环保署方法29和安大略水电法（OHM）的汞形态而言，两座焚烧炉APCD入口处烟气中的氧化汞（Hg2+）占主导。在APCD入口处，烟气中以元素形态（Hg0）存在的汞不到30%。MWI-A烟囱排放的汞也以Hg2+为主。MWI-A烟囱排放的总汞中约90%以Hg2+形式存在。由于湿式洗涤器对可溶性汞（Hg2+）的去除效率较高，MWI-B实际排放的总汞比MWI-A少。关于烟气中Hg0的去除效率，MWI-A的APCDs（DSI + FF）比MWI-B的（ESP + WS）具有更高的去除效率，这可能是由于湿式洗涤器中发生了Hg2+的还原。
