Performance of combined organic precipitation, electrocoagulation, and electrooxidation in treating anaerobically treated palm oil mill effluents

IF 5.7 3区环境科学与生态学 Q1 WATER RESOURCES Applied Water Science Pub Date : 2024-09-16 DOI:10.1007/s13201-024-02288-y

Peerawat Khongkliang, Kaewmada Chalearmkul, Kettawan Boonloh, Nunthakan Kanjanasombun, Tipaporn Darnsawat, Jarungwit Boonnorat, Abudukeremu Kadier, Putu Teta Prihartini Aryanti, Chantaraporn Phalakornkule

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Abstract

Palm oil mill effluent (POME), wastewater generated from palm oil production, is known for its extremely high chemical oxygen demand and brownish color. Anaerobic digestion is the primary treatment method for POME in the palm oil industry; however, anaerobically treated POME has high concentrations of residual contaminants and color intensity. This study proposes an approach to treat anaerobically-treated POME in recycled water for industrial applications by integrating preliminary organic precipitation, electrocoagulation, and electrooxidation (EO). The EO process was optimized in terms of the current density, electrolysis time, electrode arrangement, and feed flow rate. At a current density of 60 mA/cm² and an electrolysis time of 9 min, the EO process with a graphite anode and stainless-steel cathode in the monopolar electrode configuration reduced the phenolic concentration and color in the preliminary-treated POME from 8.95 mg/L and 317.19 ADMI to 0.25 mg/L and 26.10 ADMI, respectively. Additionally, the EO process exhibited a 92.26% efficiency in lowering the ammonium-nitrogen content.

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有机沉淀、电凝和电氧化联合处理厌氧处理棕榈油厂污水的性能

棕榈油厂废水（POME）是棕榈油生产过程中产生的废水，以其极高的化学需氧量和棕褐色而闻名。厌氧消化是棕榈油行业处理 POME 的主要方法；然而，经厌氧处理的 POME 具有较高的残留污染物浓度和色度。本研究提出了一种方法，通过整合初步有机沉淀、电凝和电氧化（EO）来处理工业用循环水中经厌氧处理的 POME。EO 工艺在电流密度、电解时间、电极排列和进料流速等方面进行了优化。在电流密度为 60 mA/cm2 和电解时间为 9 分钟的条件下，采用石墨阳极和不锈钢阴极单极电极配置的 EO 工艺可将初步处理的 POME 中的酚浓度和色度分别从 8.95 mg/L 和 317.19 ADMI 降低到 0.25 mg/L 和 26.10 ADMI。此外，环氧乙烷工艺在降低铵态氮含量方面的效率为 92.26%。

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