紫外辐照强化电解海水烟气脱硝性能实验

Experimental study on denitrification from seawater by ultraviolet irradiation

为提高电解海水的脱硝性能,将紫外光(UV)辐照与电解海水相结合进行脱硝实验,基于紫外-鼓泡光催化反应器,初步研究UV辐照对电解海水脱硝性能的影响规律,并探讨相关反应机理.首先,开展不同反应体系的脱硝性能对比实验,结果表明,在一定条件下,与无UV辐照情况相比,UV辐照与电解海水结合可以显著提高脱硝率.其次,研究了电解海水中有效氯浓度、溶液p H、UV辐照强度、NO入口浓度等因素对UV/电解海水脱硝性能的影响,结果表明,电解海水溶液中有效氯浓度与UV辐照强度的增加,可以提高UV/电解海水的脱硝性能;电解海水溶液的初始p H对UV/电解海水的脱硝性能影响较小;在NO入口质量浓度由306 mg/m3增加至1534 mg/m3的过程中,UV/电解海水的脱硝性能出现小幅下降.

For improving the denitrification performance of electrolyzed seawater, UV irradiation was introduced to com- bine with electrolyzed seawater for denitrification. The effect of UV irradiation on denitrification efficiency was investigated based on a UV-bubbling photochemical reactor, and the possible reaction mechanism was discussed preliminarily. Firstly, some contrast experiments for different reaction systems were conducted. Results show that the combination of UV irradiation and electrolyzed seawater can enhance denitrification efficiency significantly. Furthermore, the effects of active chlorine concentration, solution pH value, UV irradiation intensity, and NO inlet concentration on denitrification efficiency of UV irradiated electrolyzed seawater were studied. Results show that denitrification efficiency increases with the increasing of active chlorine concentration in electrolyzed seawater and UV irradiation intensity. The initial pH value of the electrolyzed seawater has little effect on the denitrification performance of the UV irradiated electrolyzed seawater. The denitrification efficiency of the UV irradiated electrolyzed seawater decreases slightly when the NO inlet concentration increasing from 306 mg/m3 to 1534 mg/m3.