Many coal-fired power plants have undergone a "heating transformation." This transformation measure significantly increases the boiler make-up water required by the power plant, and the make-up water source contains humic acid (HA) organic matter. HA will cause problems such as corrosion、scaling of thermal equipment and increaseing the difficulty of water treatment. The kinetics of electroflocculation were investigated in this study using an experimental device designed to treat HA from boiler make-up water, which is made of plexiglass and has a capacity of 1.2 L. The alloy plates are placed parallel to each other and perpendicular to the horizontal plane as the anode and cathode and are connected to the DC power supply through a wire. Three parameters were investigated: current density, initial pH, and electrode distance. The experimental results show that electroflocculation has a better removal effect on HA. The reaction rate constants of the three electrodes (Al–Zn–In, 6061 alloy, and Al) were 0.07994, 0.04282, and 0.03174 min. When the pH was 5, the current density was 100A·m, and the spacing between the electrodes was 3 cm, the highest rate constant of 0.10249 min was observed for Al–Zn–In, and the removal rate of HA was 93.3% in 30 min. The SEM and EDS analyses were performed on the electrode and precipitated before and after electroflocculation. The doping of Al–Zn–In with In and Zn helps maintain the electrode surface's activation state during electroflocculation. The electroflocculation effect and anti-passivation ability of the three metals are Al–Zn–In＞6061 alloy＞Al. Al–Zn–In is expected to replace aluminum plates due to its resistance to passivation and superior electroflocculation effect.

中文翻译：

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铝基电极电絮凝去除锅炉补给水中腐植酸的动力学

许多燃煤电厂都进行了“供热改造”。该改造措施大幅增加了电厂所需的锅炉补给水，补给水中含有腐殖酸（HA）有机物。 HA会造成热力设备腐蚀、结垢，增加水处理难度等问题。本研究使用设计用于处理锅炉补给水中 HA 的实验装置研究了电絮凝动力学，该装置由有机玻璃制成，容量为 1.2 L。合金板彼此平行放置并垂直于表面。水平面作为阳极和阴极，通过导线连接到直流电源。研究了三个参数：电流密度、初始 pH 值和电极距离。实验结果表明，电絮凝对HA有较好的去除效果。三种电极（Al-Zn-In、6061 合金和 Al）的反应速率常数分别为 0.07994、0.04282 和 0.03174 min。当pH为5、电流密度为100A·m、电极间距为3 cm时，Al-Zn-In的最高速率常数为0.10249 min，HA去除率为93.3%。 30分钟。对电絮凝前后的电极和沉淀进行SEM和EDS分析。 Al-Zn-In 中掺杂 In 和 Zn 有助于在电絮凝过程中保持电极表面的活化状态。三种金属的电絮凝效果和抗钝化能力为Al-Zn-In＞6061合金＞Al。 Al-Zn-In由于其耐钝化性和优越的电絮凝效果而有望取代铝板。