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采用Nano-TiO_2/O_3和Nano-TiO_2/UV/O_3进行小试实验。通过对DOC、UV254、BrO_3~-和甲醛进行检测分析,研究了不同体系去除腐殖酸(HA)并控制臭氧副产物生成的效果。结果表明,当HA浓度为10 mg·L~(-1)时,Nano-TiO_2/O_3体系对DOC的去除主要在反应进行20 min内完成,去除率仅达12.0%左右,对UV254的去除主要发生在2 min内,去除率仅达14.5%左右;而Nano-TiO_2/UV/O_3体系DOC和UV254的去除率分别达32.8%和53.3%。HA的存在显著减少了NanoTiO_2/O_3体系BrO_3~-的生成量,出水BrO_3~-浓度为29.00μg·L-1,而Nano-TiO_2/UV/O_3体系出水BrO_3~-浓度为5.00μg·L-1。研究表明,相比Nano-TiO_2/O_3体系,Nano-TiO_2/UV/O_3体系能更好地控制BrO_3~-生成,同时能提高对HA的去除效果,且无甲醛生成的风险。
Nano-TiO_2 / O_3 and Nano-TiO_2 / UV / O_3 were used for small-scale experiments. Through the detection and analysis of DOC, UV254, BrO_3 ~ - and formaldehyde, the effect of removing humic acid (HA) by different systems and controlling the formation of ozone by-products was studied. The results showed that when the concentration of HA was 10 mg · L -1, the removal of DOC by Nano-TiO 2 / O 3 system was completed within 20 min and the removal rate was only about 12.0%. The removal of UV 254 was mainly In 2 min, the removal rate was only about 14.5%. The removal rates of DOC and UV254 in Nano-TiO 2 / UV / O 3 system were 32.8% and 53.3% respectively. The production of BrO 3 - in the NanoTiO 2 / O 3 system was significantly reduced by the presence of HA, the concentration of BrO 3 - in the effluent was 29.00 μg · L -1, while the concentration of BrO 3 - in the effluent of Nano-TiO 2 / UV / O 3 system was 5.00 μg · L- 1. The results show that compared with Nano-TiO 2 / O 3 system, Nano-TiO 2 / UV / O 3 system can better control the formation of BrO 3 - and improve the removal of HA without the risk of formaldehyde formation.