微电解-臭氧化协同降解水杨酸的动力学及毒性研究
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摘要
用铁碳微电解-臭氧协同降解水杨酸(SA)模拟废水,考察了pH、SA初始质量浓度、臭氧质量浓度、温度对降解效果的影响,确定了适宜的操作参数。结果表明,当pH=8,SA初始质量浓度为400 mg/L,臭氧质量浓度为17.2mg/L,25℃下反应30 min时,SA降解率达到99.93%。SA的降解符合拟一级动力学,建立了幂指数表达的动力学模型。通过发光菌相对抑光率评估模拟废水降解过程中的毒性变化。结果表明,在最佳操作条件下,降解60 min后,COD去除率达到79.34%,相对抑光率由99.68%降到23.68%。
The iron-carbon micro-electrolysis-ozone process has been used for the synergetic degradation of simulated salicylic acid(SA) wastewater. The influences of pH,SA initial concentrations,O3 concentration,and temper-ature on the degradation effect have been investigated,and the optimal operation parameters ascertained. The results show that when pH=8,SA initial concentrations is 400 mg/L,O_3 concentration 17.2 mg/L,reaction temperature 25 ℃,and reaction time 30 min,the SA degration rate reaches 99.93%. The degradation of SA accords with pseudo-firstorder kinetics,and the kinetics model expressed by power exponent is established. The toxicity changes in the degradation process of simulated wastewater is assessed by the photogenic bacterium relative light inhibiting rate. The results show that the removing rate of COD is 79.34% under optimal conditions after degraded for 60 min,and the relative light inhibiting rate is lowered from 99.68% to 23.68%.
The iron-carbon micro-electrolysis-ozone process has been used for the synergetic degradation of simulated salicylic acid(SA) wastewater. The influences of pH,SA initial concentrations,O3 concentration,and temper-ature on the degradation effect have been investigated,and the optimal operation parameters ascertained. The results show that when pH=8,SA initial concentrations is 400 mg/L,O_3 concentration 17.2 mg/L,reaction temperature 25 ℃,and reaction time 30 min,the SA degration rate reaches 99.93%. The degradation of SA accords with pseudo-firstorder kinetics,and the kinetics model expressed by power exponent is established. The toxicity changes in the degradation process of simulated wastewater is assessed by the photogenic bacterium relative light inhibiting rate. The results show that the removing rate of COD is 79.34% under optimal conditions after degraded for 60 min,and the relative light inhibiting rate is lowered from 99.68% to 23.68%.
引文
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[5]董姣,董文艺,张先炳,等.臭氧/微电解工艺对8种染料单独及混合配水的处理效能[J].环境工程学报,2016,10(4):1835-1841.
[6] Pera-Titus M,GarciA-Molina V,Banos M A,et al. Degradation of chlorophenols by means of advanced oxidation processes:A general review[J]. Applied Catalysis B Environmental,2004,47(4):219-256.
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[8]张先炳.臭氧/微电解工艺处理活性偶氮染料废水的效能与作用机制[D].哈尔滨:哈尔滨工业大学,2015.
[9]张子间.微电解法在废水处理中的研究及应用[J].工业安全与环保,2004,30(4):8-10.
[10]裴旋,朱树华,赵华章.共价键型絮凝剂去除水中水杨酸的性能和机理[J].环境工程学报,2015,30(3):1166-1170.
[11] Wang Yan,Zhang Hui,Zhang Jianhua,et al. Degradation of tetracycline in aqueous media by ozonation in an internal loop-lift reactor[J]. Journal of Hazardous Materials,2011,192(1):35.
[12] Sevimli M F,Sarikaya H Z. Ozone treatment of textile effluents and dyes:Effect of applied ozone dose,pH and dye concentration[J].Journal of Chemical Technology&Biotechnology,2002,77(7):842-850.
[13] Zhao Qinghua,Ge Yanan,Zuo Peng,et al. Degradation of Thiamethoxam in aqueous solution by ozonation:Influencing factors,intermediates,degradation mechanism and toxicity assessment[J]. Chemosphere,2016,146:105-112.
[14] Ikhlaq A,Brown D R,Kasprzyk-Hordem B. Catalytic ozonation for the removal of organic contaminants in water on ZSM-5 zeolites[J].Applied Catalysis B:Environmental,2014,154/155(14):110-122.