草酸和醋酸作为电动淋洗液对污泥中重金属去除效果的对比  

Comparison of the Effects of Oxalic Acid and Acetic Acid as Electrokinetic Remediation Additive on the Removal of Heavy Metals in Sludge

作　　者：吕航[1] 邢思奇 李佳旭 熊巧 吴旭[1,2] Lv Hang;Xing Siqi;Li Jiaxu;Xiong Qiao;Wu Xu(Huazhong Unviersity of Science and Technology,Wuhan 430074;Hubei Huadelai Energy Saving and Emission Reduction Technology Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]华中科技大学,湖北武汉430074 [2]湖北华德莱节能减排科技有限公司,湖北武汉430074

出　　处：《广东化工》2021年第7期81-84,80,共5页Guangdong Chemical Industry

基　　金：国家重点研发计划(2020YFC1908704)。

摘　　要：对于污泥中重金属难以去除的问题,本文开展了电动淋洗单因素实验,采用草酸和醋酸作为电动淋洗液调控阴极pH的方法对污泥电动淋洗去除重金属效果进行了探究。阐明了电动淋洗前后重金属形态转化的规律,Cd、Cu的形态由较稳定的残渣态转变为迁移性较高的可交换态、铁锰氧化物结合态等,重金属形态的转变有利于其与污泥的解吸。添加草酸调控阴极pH后Cd、Cu的去除率由11.90 wt.%、12.3 wt.%提高到了33.17 wt.%和28.82 wt.%,使用柠檬酸作为添加剂后Cd、Cu的去除率分别达到了75.50 wt.%、63.23 wt.%。Heavy metals in sludge are difficult to remove. This research carried out single-factor experiment of electrokinetic remediation to remove heavy metal from sludge. Oxalic acid and Acetic acid were added to control the pH of the cathode side, and the effect of electrokinetic remediation removal heavy metals was investigated. The mechanism of heavy metal distribution and transformation before and after electrokinetic remediation were clarified. The results indicated that the state of Cd and Cu changed from a relatively stable residual to exchangeable and oxidizable state with higher mobility. The state transformation of heavy metals was beneficial to desorption from sludge. After adding oxalic acid to adjust the cathode pH, the removal rate of Cd and Cu increased from 11.90 % and 12.3 wt.% to33.17 wt.% and 28.82 wt.%. And the removal rate of Cd and Cu reached 75.50 wt.% and 63.23 wt.% after using citric acid as an additive.

关 键 词：污泥 重金属 电动淋洗 PH 添加剂 

分 类 号：TQ[化学工程]