College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China.
Environ Technol. 2020 Nov;41(27):3573-3583. doi: 10.1080/09593330.2019.1615134. Epub 2019 May 14.
A novel environment-friendly process was proposed to conduct the simultaneous removal of NO and SO. In this process, a micro-bubble generator was utilized to generate the micro-bubble gas-liquid dispersion system (MBGLS) by inhaling mixed gas (NO, SO and/or air) and absorption liquid. The MBGLS was then sprayed into an oxidation absorption column reactor, in which NO and SO were oxidized and absorbed. As the additives, air, HO and/or NaSO were brought into the MBGLS to investigate their effects on the simultaneous removal of NO and SO. In addition, the effects of initial pH and temperature of the absorption liquid on the simultaneous removal of NO and SO were also explored. The performance of the MBGLS in removing NO and SO was excellent. Even if the MBGLS was composed of tap water, NO and SO, the removal efficiencies of NO and SO respectively reached 78% and 94.4%. The additives significantly improved the removal performance of the MBGLS. Under the conditions of pH = 8 and room temperature and the addition of air, SO was removed completely and the NO removal efficiency reached 99.5% when NaSO to HO molar ratio was 0.005/0.05. The effect of the absorbent temperature on the removal of NO and SO was insignificant. With the increase in pH, the removal of NO in both HO aqueous solution and NaSO aqueous solution firstly increased and then decreased, but pH had no effect on the removal of SO.
提出了一种新型环保工艺，用于同时去除 NO 和 SO。在该工艺中，采用微孔气体发生器将混合气体（NO、SO 和/或空气）和吸收液吸入生成微孔气液分散体系（MBGLS）。然后将 MBGLS 喷射到氧化吸收柱反应器中，在其中将 NO 和 SO 氧化和吸收。作为添加剂，将空气、HO 和/或 NaSO 引入 MBGLS 中，考察它们对同时去除 NO 和 SO 的影响。此外，还探讨了吸收液初始 pH 值和温度对同时去除 NO 和 SO 的影响。MBGLS 对去除 NO 和 SO 的性能优异。即使 MBGLS 由自来水、NO 和 SO 组成，NO 和 SO 的去除效率分别达到 78%和 94.4%。添加剂显著提高了 MBGLS 的去除性能。在 pH=8、室温条件下，添加空气，当 NaSO 与 HO 的摩尔比为 0.005/0.05 时，SO 被完全去除，NO 的去除效率达到 99.5%。吸收剂温度对去除 NO 和 SO 的影响不显著。随着 pH 值的升高，HO 水溶液和 NaSO 水溶液中 NO 的去除率先升高后降低，但 pH 值对 SO 的去除率没有影响。
