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Yongpeng Ma,Dongli Yuan,Xiaojing Zhang,Zan Qu,Wenjun Huang 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.2
In this work, we investigated the absorption characteristics of SO₂ and the effect of inhibitors on the desulfurization performances of Na₂SO₃. The results showed that the NO₂ had a competitive effect with SO₂ on SO₃<SUP>2-</SUP> which resulted in a significant decrease in the absorption capacity of SO₂. O₂ in the flue gas could decrease the absorption capacity of SO₂ due to the oxidation of Na₂SO₃. Besides, Na₂S₂O₃ had more excellent inhibiting effect on the oxidation of SO₃<SUP>2-</SUP>; the inhibition mechanism is understood on the basis of the free radical chain reaction, whereby S₂O₃<SUP>2-</SUP> combined with the sulfite free radical to form an inert substance, thus, quenching the reaction of free radical with the dissolved oxygen and invariably inhibiting the oxidation of SO₃<SUP>2-</SUP>. Furthermore, the intrinsic and the apparent oxidation kinetics of Na₂SO₃ oxidation process with Na₂S₂O₃ were investigated to explain the relationships between consumption rates of SO₃<SUP>2-</SUP> and the absorption capacities of SO₂ under different components in flue gas and absorption solution.
Xiaojing Zhang,Nan Zhang,Yue Zhou,Robert Delatolla,Yali Song,Yongpeng Ma,Hongzhong Zhang 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.6
In this study, the effect of CuO nanoparticles (NPs) on partial nitrification (PN) process was investigated at various pH values. The short- and long-term experiments were carried out in six identical reactors, with or without CuO NPs, at pH values of 6.5, 8.0 and 10.0. The ammonia oxidation, reaction rates, copper content, and the microbial community were investigated. The results of this work suggested that CuO NPs inhibited the ammonia oxidation by aerobic ammonia-oxidizing bacteria (AOB), under both the acid and alkali conditions. AOB could resist the acid condition but was significantly suppressed when CuO NPs was fed, and the low pH did not aggravate the inhibition level. Almost all the bacteria lost bioactivity under the pH as 10.0, while anaerobic ammonia-oxidizing bacteria survived. The acid condition increased the Nitrosomonas relative abundance while the alkali condition lowered it. More than 60% of the supplied CuO NPs was discharged via effluent.