Sha Hao-Lei, Yang Guo-Jing, Xia Jing-Fen
Huan Jing Ke Xue. 2013 Dec;34(12):4701-5.
Purification of styrene by ultraviolet (UV)-biofiltration was studied in this paper. The light source and the biofilm carrier were ozone producing lamp at 185 nm and the peat, palm fiber, porous acticarbon, respectively. Styrene inlet concentration was controlled between 320-583 mg x m(-3), and the removal efficiency remained above 95% after stabilization. The UV converted styrene into more soluble and biodegradable intermediates, such as alcohol, aldehyde and acid, thus the performance of biofilter can be improved. In the stable operation stage, the variation of inlet concentration did not affect the removal efficiency when the total residence time (TRT) was long, however, the inlet concentration obviously affected the removal efficiency when the TRT decreased. The removal load of coupling system increased linearly with increasing inlet load, and the removal efficiency was higher than 95% under a TRT of 102 s. When TRT was 68 s and the inlet load was low, the variation of removal load complied with the law described above, but it gradually deviated from the straight line and tended to stabilized at a certain value when the inlet load became higher than 30 g x (m3 x h)(-). If considering the fluctuation of styrene concentration only, the contribution rate of ultraviolet photolysis to styrene removal was greater than that of the biofilter, and the removal effect could be restored on the fourth day, after closing the system for ten days and restarting.
本文研究了通过紫外（UV）-生物过滤法净化苯乙烯。光源和生物膜载体分别是185nm的臭氧产生灯以及泥炭、棕榈纤维、多孔活性炭。苯乙烯入口浓度控制在320 - 583mg·m⁻³之间，稳定后去除效率保持在95%以上。紫外线将苯乙烯转化为更易溶解和生物降解的中间体，如醇、醛和酸，从而提高生物滤池的性能。在稳定运行阶段，当总停留时间（TRT）较长时，入口浓度的变化不影响去除效率；然而，当TRT降低时，入口浓度明显影响去除效率。耦合系统的去除负荷随入口负荷增加呈线性增加，在TRT为102s时去除效率高于95%。当TRT为68s且入口负荷较低时，去除负荷的变化符合上述规律，但当入口负荷高于30g·(m³·h)⁻¹时，它逐渐偏离直线并趋于稳定在某一值。仅考虑苯乙烯浓度的波动，紫外光解对苯乙烯去除的贡献率大于生物滤池，在系统关闭十天后重新启动，第四天去除效果即可恢复。
