Removal of copper and nickel from municipal sludge using an improved electrokinetic process
Removal of copper and nickel from municipal sludge using an improved electrokinetic process
复制标题
使用改进的电动工艺去除城市污泥中的铜和镍
DOI：
10.1016/j.cej.2016.08.133
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发表时间：
2017-01-01
影响因子：
15.1
通讯作者：
Sun, Miaomiao
中科院分区：
文献类型：
--
作者：
Liu, Yaoxing;Chen, Jiahui;Sun, Miaomiao
利用定制的实验装置，研究了一种改进的电动(EK)工艺去除城市污泥中的铜和镍。确定的最佳工艺参数为：阳极室硝酸浓度为0.200摩尔/L，重金属和阴极室硝酸钠浓度为0.800摩尔/L，电流密度为2.0 mA/cm(2)。在处理前将污泥pH调节到3.8，可明显提高电流效率(CE)，降低比能耗(SEC)。在最佳条件下，采用两个和三个污泥室的EK系统，132h后对铜和镍的去除效率分别为51.5~82.9%和46.6~75.1%。能耗计算表明，当EK系统配置3个污泥室时，CE提高到137.8%，Sec降低到2.39kWh/kg金属去除。对现有方法的机理分析表明，该方法是一种从城市污泥中去除金属的有效技术。(C)2016爱思唯尔B.V.保留所有权利。
An improved electrokinetic (EK) process for the removal of copper and nickel from municipal sludge was investigated using a custom-made experimental setup. Optimal parameters were identified as an HNO3 electrolyte concentration of 0.200 mol/L in the anode chamber; NaNO3 electrolyte concentrations of 0.800 mol/L in the heavy-metals and cathode chambers; and a current density of 2.0 mA/cm(2). Adjustment of the sludge pH to 3.8 before treatment clearly increased the current efficiency (CE) and decreased the specific energy consumption (SEC) of the process. Under the optimal conditions in EK systems equipped with two and three sludge chambers, the removal efficiencies for copper and nickel were 51.5-82.9% and 46.6-75.1%, respectively, after 132 h. The results of a sequential extraction procedure revealed that the binding states of the metals in the sludge were changed from difficult-to-extract to more easily extractable states after the EK process. Energy consumption calculations showed that the CE increased to 137.8% and the SEC decreased to 2.39 kWh/kg of metals removed when three sludge chambers were equipped in the EK system. A mechanistic analysis of the current method demonstrated that it can be regarded as an effective technique for removing metals from municipal sludge. (C) 2016 Elsevier B.V. All rights reserved.