Department of Environmental Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, Kampar 31900, Perak, Malaysia.
Department of Civil Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Cheras, Kajang 43000, Selangor, Malaysia E-mail:
Water Sci Technol. 2022 Sep;86(5):1122-1134. doi: 10.2166/wst.2022.255.
Biological-based treatment as the conventional treatment for palm oil mill effluent (POME) in open-ponding system face a well known rate-limiting step which is hydrolysis. In this study, electrochemical oxidation (EO) by a ruthenium oxide-coated titanium (Ti/RuO) electrode was introduced as a pre-treatment for POME waste activated sludge (WAS). Surface morphology and elemental analysis were investigated using field emission scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. Response surface methodology type central composite design was used in this study to understand the relationship between the independent and dependent variables. Analysis of variance (ANOVA) was used to validate the model of the studied variables. The correlation coefficients (R) indicated a close agreement between the experimental results and the predicted values, with high R values of 0.9044-0.9773. Multiple response optimization suggested that the range of current density (17-27 mA/cm) and electrolysis time (55-75 min) at a fixed concentration of sodium chloride (10 g/L), resulted in mixed liquor volatile suspended solids (MLVSS) removal >20%, capillary suction timer (CST) reduction >43%, extracellular polymeric substances (EPS) increment <19% and soluble chemical oxygen demand (sCOD) increment >25%. EO appears to be an efficient pre-treatment as well as practical way to improve the POME WAS disintegration and dewaterability.
生物处理作为传统的露天池塘系统中棕榈油厂废水（POME）的处理方法，面临着众所周知的限速步骤，即水解。在本研究中，电化学氧化（EO）通过涂覆氧化钌的钛（Ti/RuO）电极被引入作为 POME 废活性污泥（WAS）的预处理。使用场发射扫描电子显微镜和能量色散 X 射线光谱法分别研究了表面形态和元素分析。本研究采用响应面法型中心复合设计来理解自变量和因变量之间的关系。方差分析（ANOVA）用于验证所研究变量的模型。相关系数（R）表明实验结果与预测值之间具有密切的一致性，R 值高达 0.9044-0.9773。多响应优化表明，在固定氯化钠浓度（10 g/L）下，电流密度（17-27 mA/cm）和电解时间（55-75 分钟）的范围导致混合液挥发性悬浮固体（MLVSS）去除率>20%，毛细吸时（CST）减少率>43%，胞外聚合物物质（EPS）增加率<19%，可溶性化学需氧量（sCOD）增加率>25%。EO 似乎是一种有效的预处理方法，也是提高 POME WAS 分解和脱水性能的实用方法。
