[1]刘宁,赵欣,王灿,等.电过滤氧化技术在煤化工纳滤浓水处理中的应用[J].中国给水排水,2025,41(9):109-115.
　LIUNing,ZHAOXin,WANGCan,et al.Application of Electrofiltration Oxidation Technology for Treating Nanofiltration Concentrated Water in Coal Chemical Industry[J].China Water & Wastewater,2025,41(9):109-115.
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电过滤氧化技术在煤化工纳滤浓水处理中的应用

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第41卷 期数: 2025年第9期 页码: 109-115 栏目: 出版日期: 2025-05-01
Title:
Application of Electrofiltration Oxidation Technology for Treating Nanofiltration Concentrated Water in Coal Chemical Industry
作者:
刘宁1， 赵欣1， 王灿1， 黄威齐1， 孔韡2， 汪炎2
（1.天津大学 环境科学与工程学院，天津 300350；2.东华工程科技股份有限公司，安徽 合肥 230024）
Author(s):
LIU　Ning1， ZHAO　Xin1， WANG　Can1， HUANG　Wei-qi1， KONG　Wei2， WANG　Yan2
（1. School of Environmental Science & Engineering， Tianjin University， Tianjin 300350， China； 2. East China Engineering Science and Technology Co. Ltd.， Hefei 230024， China）
关键词:
纳滤浓水;  电过滤氧化技术;  煤化工;  高盐度废水;  废水零排放;  能耗
Keywords:
nanofiltration concentrated water;  electrofiltration oxidation technology;  coal chemical industry;  high salinity wastewater;  wastewater zero discharge;  energy consumption
摘要:
煤化工废水回用系统选用“纳滤分盐+蒸发结晶”工艺处理反渗透浓水来实现“废水零排放”，但纳滤分盐产生的浓水COD过高，直接蒸发结晶会导致液沫夹带等问题，工程上常采用臭氧催化氧化技术在结晶前对纳滤浓水进行氧化处理，但该技术运行不稳定、处理效果较差，故采用电过滤氧化技术对浓水处理工艺进行改造。结果表明，电过滤氧化系统对有机物的去除效果明显，以7.64 mA/cm2的电流密度运行2 h，COD去除率可达50%左右，去除单位COD消耗的能量（EC）为0.128 kW·h/g，去除单位数量级污染物的能量消耗值（EE/O）为9.15 kW·h/m3；以25.48 mA/cm2的电流密度运行2 h，COD去除率可达93%左右。电过滤氧化系统具有良好的稳定性，多次重复实验的处理效果大致相同，色度去除率达90%以上。余氯产生量在0.1~1 mg/L，有一定杀菌作用，不会氧化侵蚀反渗透膜。处理过程中废水理化性质保持稳定，规避了可能出现的工程安全隐患，可以为工业上膜过滤浓水的深度处理提供参考。
Abstract:
The recycling system for coal chemical wastewater usually employs the “nanofiltration salt separation and evaporation crystallization” process to treat reverse osmosis concentrated water, thereby achieving “wastewater zero discharge”. However, COD in the concentrated water produced by nanofiltration is excessively high, and direct evaporation and crystallization may result in issues such as liquid entrainment. In engineering applications, catalytic ozonation is commonly utilized to oxidize nanofiltration concentrated water prior to crystallization. Nevertheless, this technology exhibits operational instability and poor treatment efficiency. Therefore, the electrofiltration oxidation technology was introduced to reform the concentrated water treatment process. The electrofiltration oxidation system demonstrated a significant efficacy in the removal of organic matters. When operated at a current density of 7.64 mA/cm2 for 2 hours, the COD removal rate reached approximately 50%. The energy consumption for removing COD was 0.128 kW·h/g, while the energy consumption value for the removal of one unit order of pollutants was 9.15 kW·h/m3. When the current density was maintained at 25.48 mA/cm2 for a duration of 2 hours, the COD removal rate could achieve up to approximately 93%. The electrofiltration oxidation system exhibited excellent stability, with repeated experimental results demonstrating consistent treatment efficacy. Notably, the chroma removal rate exceeded 90%. The residual chlorine generated was within the range of 0.1 mg/L to 1 mg/L, which exhibited a certain level of bactericidal efficacy while ensuring no oxidation or corrosion of the reverse osmosis membrane. Additionally, physicochemical properties of the wastewater remained stable during the treatment process, thereby preventing potential engineering safety risks. This study can serve as a valuable reference for the advanced treatment of concentrated water in industrial membrane filtration processes.
更新日期/Last Update: 2025-05-01