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首页> 外文期刊>Waste Management & Research >Optimization of the humic acid separation and coagulation with natural starch by RSM for the removal of COD and colour from stabilized leachate
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Optimization of the humic acid separation and coagulation with natural starch by RSM for the removal of COD and colour from stabilized leachate

机译：RSM优化腐植酸与天然淀粉的分离和混凝，以去除稳定渗滤液中的COD和颜色

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摘要

The removal of concentrated colour (around 5039 Pt-Co) and chemical oxygen demand (COD; around 4142mgL~(-1)) from matured landfill leachate through a novel combination of humic acid extraction and coagulation with natural oil palm trunk starch (OPTS) was investigated in this study. Central composite design from response surface methodology of Design Expert-10 software executed the experimental design to correlate experimental factors with desired responses. Analysis of variance developed the quadratic model for four factors (e.g. coagulant dosage, slow mixing speed and time and centrifugation duration) and two responses (% removal of colour, COD). The model confirmed the highest colour (84.96%) and COD (48.84%) removal with a desirability function of 0.836 at the optimum condition of 1.68gL~(-1) coagulant dose, 19.11 rpm slow mixing speed, 16.43 minutes for mixing time and 35.75 minutes for centrifugation duration. Better results of correlation coefficient (R~2 = 0.9& and 0.96) and predicted R~2 (0.94 and 0.84) indicates the model significance. Electron microscopic images display the amalgamation of floes through bridging. Fourier transforms infrared spectra confirmed the existence of selected organic groups in OPTS, which eventually signifies the applied method.
机译：本研究采用腐植酸提取与天然油棕树干淀粉（OPTS）混凝的新型组合，研究了成熟垃圾渗滤液中浓缩色素（约5039 Pt-Co）和化学需氧量（COD;约4142mgL~（-1））的去除。Design Expert-10 软件的响应面方法的中央复合材料设计执行了实验设计，以将实验因素与期望的响应相关联。方差分析开发了四个因素（例如混凝剂用量、缓慢的混合速度和时间以及离心持续时间）和两个响应（去除颜色百分比、COD）的二次模型。在混凝剂量为1.68gL~（-1）rpm、混合速度慢速19.11 rpm、混合时间为16.43 min、离心时间35.75 min的最佳条件下，该模型的色度和COD（48.84%）去除率最高，合意函数为0.836。相关系数（R~2 = 0.9& 和 0.96）和预测 R~2（0.94 和 0.84）的更好结果表明模型显著性。电子显微镜图像显示浮冰通过桥接合并。傅里叶变换红外光谱证实了OPTS中选定有机基团的存在，这最终表明了所应用的方法。

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