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Degradation of micropolluants in flow-through VUV/UV/h2o2 reactors: Effects of h2o2 dosage and reactor internal diameter

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Journal of Environmental Sciences 2021年第12期33卷 28-37页

作者： Lumeng Zhan Wentao Li Li Liu Tao han Mengkai Li Zhimin Qiang 无 Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Geosciences and Natural Resource Management University of CopenhagenFrederiksberg C 1985Denmark Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China School of Environmental Science and Engineering Qingdao UniversityQingdao 266071China

The degradation of atrazine (ATZ),sulfamethoxazole (SMX) and metoprolol (MET) in flowthrough VUV/UV/h2o2reactors was investigated with a focus on the effects of h2o2dosage and reactor internal diameter (ID).Results showed that the micropollutants were degraded efficiently in the flow-through VUV/UV/h2o2reactors following the pseudo first-order kinetics (R2>0.92).however,the steady-state assumption (SSA) kinetic model being vital in batch reactors was found invalid in flow-through reactors where fluid mixing was less *** the increase of h2o2dosage,the ATZ removal efficiency remained almost constant while the SMX and MET removal was enhanced to different extents,which could be explained by the different reactivities of the pollutants towards ho·.A larger reactor ID resulted in lower degradation rate constants for all the three pollutants on account of the lower average fluence rate,but the change in energy efficiency was much more *** reality,the electrical energy per order (EEo) of the investigated VUV/UV/h2o2treatments ranged between 0.14–0.20,0.07–0.14 and 0.09–0.26 k Wh/m3/order for ATZ,SMX and MET,respectively,with the lowest EEofor each pollutant obtained under varied h2o2dosages and reactor *** study has demonstrated the efficiency of VUV/UV/h2o2process for micropollutant removal and the inadequacy of the SSA model in flow-through reactors,and elaborated the influential mechanisms of h2o2dosage and reactor ID on the reactor performances.

关键词： VUV/UV/h2o2 Flow-through reactor Degradation h2o2 dosage Reactor internal diameter

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optimization of h_2o_2 dosage in microwave-h_2o_2 process for sludge pretreatment with uniform design method

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Journal of Environmental Sciences 2012年第12期24卷 2060-2067页

作者： Qingcong Xiao hong Yan Yuansong Wei Yawei Wang Fangang Zeng Xiang Zheng Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China School of Environment and Natural Resources Renmin University of ChinaBeijing 100872China CSD IDEA(Beijing)Institute of Environmental Innovation Co.Ltd. Beijing 100192China

A microwave-h202 process for sludge pretreatment exhibited high efticiencies of releasing organics, nitrogen, and phosphorus, but large quantifies of h202 residues were detected. A uniform design method was thus employed in this study to further optimize h202 dosage by investigating effects of ph and h202 dosage on the amount of 1-I202 residue and releases of organics, nitrogen, and phosphorus. A regression model was established with ph and h202 dosage as the independent variables, and h202 residue and releases of organics, nitrogen, and phosphorus as the dependent variables. In the optimized microwave-h202 process, the ph value of the sludge was firstly adjusted to 11.0, then the sludge was heated to 80~C and h202 was dosed at a h202 ：mixed liquor suspended solids （MLSS） ratio of 0.2, and the sludge was finally heated to 100~C by microwave irradiation. Compared to the microwave-h202 process without optimization, the h202 dosage and the utilization rate of h202 in the optimized microwave-h202 process were reduced by 80% and greatly improved by 3.87 times, respectively, when the h202：MLSS dosage ratio was decreased from 1.0 to 0.2, resulting in nearly the same release rate of soluble chemical oxygen demand in the microwave-h202 process without optimization at h202：MLSS ratio of 0.5.

关键词： h2o2 dosage uniform design method microwave optimization sludge pretreatment

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