Yan J H, Peng Z, Lu S Y, Li X D, Ni M J, Cen K F, Dai H F
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China.
J Hazard Mater. 2007 Aug 17;147(1-2):652-7. doi: 10.1016/j.jhazmat.2007.02.073. Epub 2007 Mar 4.
The potential of mechanochemical treatment (MC) to degrade PCDD/Fs contained in fly ash was tested via grounding with and without calcium oxide (CaO) under atmospheric pressure. Three types of fly ash collected from medical waste incineration were compared, originating either from rotary kiln fluidized bed multi-stage incinerator using activated carbon spray (FA1, FA2), or a simple stoker incinerator without activated carbon spray (FA3). In test I: CaO to FA1 mixed at ratio of 6-60% was milled at rotational speed of 350 rpm; in test II: FA2 and FA3 without CaO were milled at rotational speed of 400 rpm. The duration of the tests was 2h. The results from the present study indicate that (1) under two test conditions of with and without CaO, PCDD/Fs contained in real fly ash both can be degraded by mechanochemical treatment, (2) under condition of blending with CaO, the degradation efficiency of PCDD/Fs increased with increasing ratio of CaO, (3) the degradation efficiency of PCDD/Fs may increase with rotational speed increasing and (4) the destruction and dechlorination are major mechanism for PCDD/Fs degradation. These results show that mechanochemical treatment is a high potential technology for PCDD/Fs degradation in fly ash.
通过在大气压下添加和不添加氧化钙（CaO）进行研磨，测试了机械化学处理（MC）降解飞灰中所含多氯二苯并对二噁英/多氯二苯并呋喃（PCDD/Fs）的潜力。比较了从医疗废物焚烧中收集的三种飞灰，分别来自使用活性炭喷雾的回转窑流化床多级焚烧炉（FA1、FA2）或不使用活性炭喷雾的简单层燃炉（FA3）。在试验I中：将CaO与FA1按6-60%的比例混合，以350转/分钟的转速研磨；在试验II中：将不含CaO的FA2和FA3以400转/分钟的转速研磨。试验持续时间为2小时。本研究结果表明：（1）在添加和不添加CaO的两种试验条件下，实际飞灰中所含的PCDD/Fs均可通过机械化学处理降解；（2）在与CaO混合的条件下，PCDD/Fs的降解效率随CaO比例的增加而提高；（3）PCDD/Fs的降解效率可能随转速的增加而提高；（4）破坏和脱氯是PCDD/Fs降解的主要机制。这些结果表明，机械化学处理是一种降解飞灰中PCDD/Fs的极具潜力的技术。
