Dosage and settling time course optimization of Moringa oleifera in municipal wastewater treatment using response surface methodology
Dosage and settling time course optimization of Moringa oleifera in municipal wastewater treatment using response surface methodology
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DOI：
10.5004/dwt.2019.24616
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发表时间：
2019-11-01
影响因子：
1.1
通讯作者：
Choid, Kyung-Sook
中科院分区：
文献类型：
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作者：
Adelodun, Bashir;Ajibade, Fidelis Odedishemi;Choid, Kyung-Sook
辣木(Moringa oleifera，MO)在废水处理中的功效已经得到了很好的研究和文献记载。然而，在探索优化废水处理工艺的运行条件方面还存在着很大的差距。采用响应曲面法中以面为中心的中心组合设计，考察并优化了在pH值(5~7)、MO投加量(50~200 mg/L)、沉淀时间(60~240min)等操作条件下对城市污水浊度、生化需氧量和化学需氧量的去除效果。FCCCD的实验结果被拟合到二阶二次模型中，以数学关系近似每个变量因素及其交互作用对感兴趣响应的影响，从而预测过程响应。结果表明，在最佳运行条件下，当pH值为6.01时，MO投加量为182.74 mg/L，沉淀时间为228.08 m in时，浊度、BOD和COD值的预测值分别为98.20%、92.96%和78.82%，均达到了1.000的要求。研究表明，FCCCD具有理想函数，可以优化混凝工艺条件(pH、MO投加量和沉淀时间)对浊度、BOD和COD的去除效果。
The efficacy of the Moringa oleifera (MO) in wastewater treatment has been well studied and documented. However, there exists a significant gap in exploring the operating conditions to optimize the wastewater treatment process. This study investigated and optimized the removal efficiency of turbidity, biochemical oxygen demand (BOD), and chemical oxygen demand (COD) from municipal wastewater under the operating conditions of pH (5-7), MO dosage (50-200 mg/L), and settling time courses (60-240 min) using face-centered central composite design (FCCCD) of response surface methodology. The experimental results of FCCCD were fitted to the second-order quadratic model to approximate the effects of each variable factor and their interactions on the responses of interest in a mathematical relationship and consequently, predict the process responses. The obtained results revealed that under the optimum operating conditions of pH, MO dosage, and settling time of 6.01, 182.74 mg/L, and 228.08 min, respectively, the predicted values of turbidity, BOD, and COD removal efficiencies were 98.20%, 92.96%, and 78.82%, respectively, with the desirability of 1.000. This study demonstrated the effectiveness of FCCCD with a desirability function to optimize the process conditions (pH, MO dosage, and settling time) of coagulation for the turbidity, BOD, and COD removal efficiencies.