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Performance of integrated treatment system of photofentonudand membrane bioreactor for synthetic spentudcaustic wastewater

机译:光芬顿综合处理系统的性能和膜生物反应器用于合成废液苛性废水

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摘要

The potential of a combined integrated treatment system using photo-Fenton process and membrane bioreactor (MBR) was studied in the treatment of spent caustic wastewater with initial COD and sulfide of 1990-2740 mg/L and 82-165 mg/L, respectively and at biodegradability level (BOD5/COD) of 0.39-0.52. Photo- Fenton process was carried out to reduce influent toxicity that can destroy living microorganism in the MBR. Molar ratio of hydrogen peroxide to COD values ([H2O2/COD]), ferrous ion to hydrogen peroxide [Fe2+/H2O2], and reaction time were studied on degradation of chemicals contained in the wastewater within the range of 1.5-2.5, 0.05-0.15 and 0-60 minutes. A statistical experimental design using central composite design (CCD) was employed to describe the relationship of individual and combined parameters towards the degradation. The optimum conditions were selected based on the highest percentage of COD and sulfide removal as well as acceptable BOD5/COD with minimum value of molar ratio [H2O2/COD] and [Fe2+/H2O2] within reaction time range. Optimum conditions for molar ratio [H2O2/COD] and [Fe2+/H2O2] at pH of 3 were 1.5 and 0.05 with reaction time of 47.84 minutes. The optimum condition for MBR was evaluated based on critical flux value. It was observed that critical flux was achieved at flux of 6 and 9.5 L m-2 h-2. The achievement of optimal conditions for both processes led to the assessment of the integrated treatment. It was found that the overall percentage removal of COD and sulfide were 99.27–99.92% and 100% leading to final effluent with COD and sulfide concentrations of 20 mg/L and 0.001 mg/L, respectively. It can be concluded that the integrated treatment system combining photo-Fenton and MBR could be an efficient alternative method for spent caustic wastewater.
机译:研究了使用光芬顿工艺和膜生物反应器(MBR)的组合式综合处理系统在处理废苛性碱废水中的潜力,其初始COD和硫化物分别为1990-2740 mg / L和82-165 mg / L,生物降解水平(BOD5 / COD)为0.39-0.52。进行光芬顿法以减少可破坏MBR中活微生物的进水毒性。研究了过氧化氢与COD值的摩尔比([H2O2 / COD]),亚铁离子与过氧化氢的摩尔比[Fe2 + / H2O2],以及反应时间对1.5-2.5、0.05- 0.15和0-60分钟。采用采用中央复合设计(CCD)的统计实验设计来描述各个参数和组合参数与降解之间的关系。根据反应时间范围内最高的COD和硫化物去除率以及可接受的BOD5 / COD和摩尔比[H2O2 / COD]和[Fe2 + / H2O2]的最小值选择最佳条件。 pH为3时,[H2O2 / COD]和[Fe2 + / H2O2]摩尔比的最佳条件为1.5和0.05,反应时间为47.84分钟。基于临界通量值评估了MBR的最佳条件。观察到在通量为6和9.5 L m-2 h-2时达到了临界通量。两种工艺均达到最佳条件导致对综合处理的评估。结果发现,COD和硫化物的总去除率分别为99.27–99.92%和100%,最终废水的COD和硫化物浓度分别为20 mg / L和0.001 mg / L。可以得出结论,结合了光芬顿和MBR的综合处理系统可能是废碱废水的一种有效替代方法。

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    Zulhaimi Hanna Ilyani;

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  • 年度 2014
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  • 正文语种 en
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