Comparison of UV/Persulfate and UV/H2O2 for the removal of naphthenic acids and acute toxicity towards Vibrio fischeri from petroleum production process water
Comparison of UV/Persulfate and UV/H2O2 for the removal of naphthenic acids and acute toxicity towards Vibrio fischeri from petroleum production process water
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DOI：
10.1016/j.scitotenv.2019.133686
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发表时间：
2019-12-01
影响因子：
9.8
通讯作者：
El-Din, Mohamed Gamal
中科院分区：
文献类型：
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作者：
Fang, Zhi;Huang, Rongfu;El-Din, Mohamed Gamal
紫外光活化过硫酸盐法（UV/ persulfate）作为一种新型的高级氧化法处理城市和工业废水，近年来受到了广泛的关注。在环境pH条件下，采用中压汞灯（发射波长在200 ~ 530 nm之间），研究了UV/过硫酸盐和UV/H2O2工艺处理实际油砂工艺水（OSPW）。采用同步荧光光谱法和超高效液相色谱-飞行时间质谱法分别评价了OSPW对荧光基团有机物和环烷酸（NAs）的降解性能。与UV/H2O2工艺相比，UV/过硫酸盐工艺对na和荧光基团有机化合物的去除效率更高。在紫外线照射40分钟，入射辐照度为3.50 mW cm（-2）的条件下，紫外线/过硫酸盐（2 mM）对荧光团有机化合物进行了大量降解，二环和三环融合有机物被完全去除。过硫酸盐投加量为0.5、2和4 mM时，OSPW中O-2-NAs去除率分别为59.4%、83.8%和92.2%。当过硫酸盐浓度为2 mM时，由于在相同的过程中形成了氧化的NAs，随着na中氧原子数的增加，去除效率降低（O-2-、O-3-和O-4-NAs的氧原子数分别为83.8%、49.3%和46.8%）。O-2-NA化合物的结构反应性符合准一级动力学，速率常数为0.0156 min(-1) ~ 0.1511 min（-1）。高碳数和双键等价的NAs在UV/过硫酸盐氧化过程中反应性更强。经UV/过硫酸盐和UV/H2O2处理后，OSPW对费氏弧菌的急性毒性显著降低。综上所述，UV/过硫酸盐氧化法是OSPW回收的有效替代方法。(C) 2019 Elsevier B.V.版权所有
The ultraviolet light-activated persulfate process (UV/Persulfate) has received much attention in recent years as a novel advanced oxidation method for the treatment of municipal and industrial wastewater. This work investigated the UV/Persulfate and UV/H2O2 processes for the treatment of real oil sands process water (OSPW) at ambient pH condition using a medium pressure mercury lamp (emission between 200 and 530 nm). The degradation performances towards fluorophore organic compounds and naphthenic acids (NAs) in OSPW were evaluated using synchronous fluorescence spectrometry and ultra performance liquid chromatography time-of-flight mass spectrometry, respectively. Compared to the UV/H2O2 process, the UV/Persulfate process exhibited higher efficiency to remove both NAs and fluorophore organic compounds. Under 40 min of UV exposure and incident irradiance of 3.50 mW cm(-2), fluorophore organic compounds were greatly degraded by UV/Persulfate (2 mM) and two- and three-ring fused organics were completely removed. 59.4%, 83.8% and 92.2% of O-2-NAs in OSPW were removed with persulfate dosages of 0.5, 2, and 4 mM, respectively. The removal efficiency decreased along with the number of oxygen atoms in NAs (83.8%, 49.3%, and 46.8% for O-2-, O-3-, and O-4-NAs, respectively) with 2 mM of persulfate, because of the formation of oxidized NAs in the same process. The structure-reactivity of O-2-NA compounds fitted pseudo-first order kinetics in UV/Persulfate process with the rate constants ranging from 0.0156 min(-1) to 0.1511 min(-1). NAs with higher carbon numbers and double bond equivalence were more reactive in the UV/Persulfate oxidation process. The acute toxicity of OSPW to Vibrio fischeri was significantly reduced after the UV/Persulfate and UV/H2O2 treatments. Overall results demonstrated that the UV/Persulfate oxidation can be an effective alternative for future reclamation of OSPW. (C) 2019 Elsevier B.V. All rights reserved.