硫酸铵和尿素对活性炭中 PCDD/F 形成的影响及抑制作用的可能机制。
Effect of ammonium sulfate and urea on PCDD/F formation from active carbon and possible mechanism of inhibition.
机构信息
Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, China; State Key laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
出版信息
J Environ Sci (China). 2014 Nov 1;26(11):2277-82. doi: 10.1016/j.jes.2014.09.012. Epub 2014 Sep 23.
The effect of ammonium sulfate ((NH4)2SO4) and urea (CO(NH2)2) on polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) formation from active carbon was investigated in this study. Both additives could significantly inhibit PCDD/F formation, and PCDD/F (TEQ) generation was reduced to 98.5% (98%) or 64.5% (77.2%) after 5% (NH4)2SO4 or CO(NH2)2 was added into model ash, respectively. The inhibition efficiency of PCDDs was higher than the value of PCDFs, however, the reduction of PCDD/F yield was mainly from PCDFs decreasing. In addition, the solid-phase products were reduced more than the gas-phase compounds by inhibitors. By the measurement of chlorine emission in the phase of ion (Cl[Cl(-)]) and molecule gas (Cl[Cl2]), it was observed that both Cl[Cl(-)] and Cl[Cl2] were reduced after inhibitors were added into ash. Cl[Cl2] was reduced to 51.0% by urea addition, which was supposed as one possible mechanism of PCDD/F inhibition.
本研究考察了硫酸铵((NH4)2SO4)和尿素(CO(NH2)2)对活性炭中多氯二苯并对二恶英和呋喃(PCDD/F)形成的影响。这两种添加剂都能显著抑制 PCDD/F 的形成，在添加 5%((NH4)2SO4)或 CO(NH2)2 到模型灰分后，PCDD/F(TEQ)的生成量分别减少到 98.5%(98%)或 64.5%(77.2%)。PCDDs 的抑制效率高于 PCDFs 的值，但 PCDD/F 产率的降低主要是由于 PCDFs 的减少。此外，抑制剂使固相产物的减少量大于气相化合物。通过测量离子(Cl[Cl(-)])和分子气体(Cl[Cl2])相中氯的排放，观察到添加抑制剂后，Cl[Cl(-)]和 Cl[Cl2]都减少了。尿素的添加将 Cl[Cl2]减少到 51.0%，这被认为是 PCDD/F 抑制的一种可能机制。
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