期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 50, 期 11, 页码 5849-5856出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b00133
关键词
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资金
- National Natural Science Foundation of China [51408592, 51525806, 51221892]
- National Geographic Air and Water Conservation Fund [GEFC23-15]
Vacuum ultraviolet (VUV) and ultraviolet (UV)/chlorine processes are regarded as two of many advanced oxidation processes (AOPs). Because of the similar cost of VUV/UV and UV lamps, a combination of VUV and UV/chlorine (i.e., VUV/UV/chlorine) may enhance the removal of organic pollutants in water but without any additional power input. In this paper, a mini-fluidic VUV/UV photoreaction system (MVPS) was developed for bench-scale experiments, which could emit both VUV (185 nm) and DV (254 nm) or solely DV beams with a nearly identical UV photon fluence. The photon fluence rates of UV and VUV output by the MVPS were determined to be 8.88 X 10(-4) and 4.93 x 10(-5) einstein m(-2) s(-1), respectively. The VUV/UV/chlorine process exhibited a strong enhancement concerning the degradation of methylene blue (MB, a model organic pollutant) as compared to the total performance of the VUV/UV and UV/chlorine processes, although the photon fluence of the VUV only accounted for 5.6% of that of the UV. An acidic pH favored MB degradation by the VUV/UV/chlorine process. The synergistic mechanism of the VUV/UV/chlorine process was mainly ascribed to the effective use of (OH)-O-center dot for pollutant removal through formation of longer-lived secondary radicals (e.g., (OCl)-O-center dot). This study demonstrates that the new VUV/UV/chlorine process, as an enhanced AOP, can be applied as a highly effective and energy-saving technology for small-scale water and wastewater treatment.
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