Abstract

In this study, sulfide removal was carried out in the Electrocoagulation process under controlled and uncontrolled pH conditions. Under optimum conditions, electrocoagulation took place in less than 40 minutes at uncontrolled pH and less than 30 minutes at controlled pH to reduce the sulfite concentration of the effluent below 0.5 mg/L. The reaction rate constant and iron-sulfide molar ratio for sulfide removal were 14.09 × 10^–2 min^–1 and 0.97 mol/mol, respectively; under uncontrolled pH conditions, they were 22.88 × 10^–2 and 0.97 mol/mol at controlled pH. The mg sulfide removed per g Fe was calculated as 654.0 mg S^2–/g Fe at uncontrolled pH and 508.46 mg S^2–/g Fe at controlled pH. The operating costs for uncontrolled and controlled pH conditions were also calculated as 2.063 $/m³ (0.747 $/kg S) and 0.842 $/m³ (0.628 $/kg S), respectively. Controlled pH conditions were important in sulfide removal by the Electrocoagulation process.

中文翻译：

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使用铁阳极在受控和不受控 pH 值下进行电化学除硫

摘要

在本研究中，在受控和非受控 pH 条件下，在电凝过程中去除硫化物。在最佳条件下，在不受控制的 pH 值下，电凝聚在 40 分钟内发生，在受控 pH 值下，电凝聚在 30 分钟内发生，将出水亚硫酸盐浓度降低到 0.5 mg/L 以下。去除硫化物的反应速率常数和铁-硫化物摩尔比分别为14.09 × 10 ^–2 min ^–1和0.97 mol/mol；在不受控制的 pH 条件下，它们为 22.88 × 10 ^–2；在受控 pH 条件下，它们为 0.97 mol/mol。每克 Fe 去除的硫化物毫克数计算为，在不受控制的 pH 值下为 654.0 mg S ^2– /g Fe，在受控 pH 值下为 508.46 mg S ^2– /g Fe。不受控和受控 pH 条件的运行成本也分别计算为 2.063 $/m ³ (0.747 $/kg S) 和 0.842 $/m ³ (0.628 $/kg S)。控制 pH 条件对于电凝工艺去除硫化物非常重要。