电絮凝-煤基粉末活性炭工艺处理渗滤液：效率、机理、动力学和成本。

Leachate treatment via electrocoagulation-coal-based powdered activated carbon process: Efficiencies, mechanisms, kinetics, and costs.

机构信息

Civil Engineering Department, Munzur University, Tunceli, Turkey.

Environmental Engineering Department, Atatürk University, Erzurum, Turkey.

出版信息

Water Environ Res. 2024 Jun;96(6):e11060. doi: 10.1002/wer.11060.

DOI:10.1002/wer.11060

PMID:38847129

Abstract

This study aims to improve COD, NH-N, and turbidity removal from Bingöl's leachate using a single-reactor integrated electrocoagulation (EC)-coal-based powdered activated carbon (CBPAC) process under various experimental conditions. In the EC-CBPAC process, three stainless-steel cathodes and three aluminum electrodes were connected to the negative and positive terminals of the power supply, respectively. The initial concentrations in the leachate were 1044 mg O/L for COD, 204 mg/L for NH-N, and 57 NTU (or 71.25-mg (NH)2HSO/L) for turbidity, respectively. After a 40-min EC-CBPAC process, with a CBPAC dosage of 5 g/L and pH of 5 for COD and turbidity, and 9.5 for NH-N, the optimum removal efficiencies for COD, NH-N, and turbidity were achieved at 92%, 40%, and 91%, respectively. When the EC process was applied without CBPAC under the same experimental conditions, the removal efficiencies of COD, NH-N, and turbidity were 87%, 28%, and 54%, respectively. Before and after the EC-CBPAC process, the Brunauer-Emmett-Teller (BET) surface area, pore volume, and mean pore diameter of the CBPAC were found to be (888 m/g, 0.498 cm/g, and 22.28 Å) and (173 m/g, 0.18 cm/g, and 42.8 Å), respectively. The optimum pseudo-first-order (PFO) rate constants for COD, turbidity, and NH-N were determined to be 3.15 × 10, 4.77 × 10, and 8.8 × 10 min, respectively. With the current density increasing from 15 to 25 mA/cm, energy consumption, unit energy consumption, and total cost increased from 68.7 to 122.4 kWh/m, 6.948 to 15.226 kWh/kg COD, and 0.85 to 1.838 $/kg COD, respectively. PRACTITIONER POINTS: EC-CBPAC process has greater COD, NH-N, and turbidity removal efficiency than EC process. COD and turbidity achieved their optimum disposal efficiencies at 92% and 91%, respectively, at pH 5 The most efficient disposal efficiency for NH-N was observed to be 40% at pH 9.5. EC-CBPAC process increased removal efficiencies for COD, NH-N, and turbidity by 20%, 19%, and 38%, respectively, compared with EC alone. The turbidity, NH-N, and COD disposal fitted PSO model due to high correlation values (R 0.94-0.99).

摘要

本研究旨在通过单反应器集成电凝聚（EC）-煤基粉末活性炭（CBPAC）工艺，在各种实验条件下提高比格尔浸出液的 COD、NH-N 和浊度去除率。在 EC-CBPAC 工艺中，三个不锈钢阴极和三个铝电极分别连接到电源的负极和正极。浸出液的初始浓度分别为 COD 为 1044mg O/L、NH-N 为 204mg/L 和浊度为 57NTU（或 71.25mg(NH)2HSO/L）。经过 40 分钟的 EC-CBPAC 处理，在 CBPAC 用量为 5g/L、pH 值为 5（用于 COD 和浊度）和 9.5（用于 NH-N）的条件下，COD、NH-N 和浊度的最佳去除效率分别达到 92%、40%和 91%。在相同的实验条件下，当 EC 过程没有 CBPAC 时，COD、NH-N 和浊度的去除效率分别为 87%、28%和 54%。在 EC-CBPAC 工艺前后，CBPAC 的 Brunauer-Emmett-Teller（BET）表面积、孔体积和平均孔径分别为（888m/g、0.498cm/g 和 22.28Å）和（173m/g、0.18cm/g 和 42.8Å）。COD、浊度和 NH-N 的最佳拟一级（PFO）速率常数分别确定为 3.15×10、4.77×10 和 8.8×10min。随着电流密度从 15mA/cm 增加到 25mA/cm，能量消耗、单位能耗和总成本分别从 68.7kWh/m 增加到 122.4kWh/m、6.948kWh/kg COD 增加到 15.226kWh/kg COD 和 0.85 美元/kg COD 增加到 1.838 美元/kg COD。

从业者要点

EC-CBPAC 工艺比 EC 工艺具有更高的 COD、NH-N 和浊度去除效率。在 pH 值为 5 时，COD 和浊度的最佳处理效率分别达到 92%和 91%。在 pH 值为 9.5 时，NH-N 的最高去除效率为 40%。与单独的 EC 相比，EC-CBPAC 工艺使 COD、NH-N 和浊度的去除效率分别提高了 20%、19%和 38%。由于高相关值（R 0.94-0.99），浊度、NH-N 和 COD 的处理拟合 PSO 模型。