环境工程学报2025，Vol.19Issue(7)：1627-1640,14.DOI:10.12030/j.cjee.202408055
电Fenton-絮凝沉淀耦合工艺处理垃圾渗滤液纳滤浓缩液
Treatment of leachate nanofiltration concentrate using an electro-Fenton coagulation-precipitation coupled process
摘要
Abstract
To address the challenges posed by the high concentration of refractory organic pollutants in nanofiltration concentrate of leachate(NCL)and the general inefficacy of biological treatment processes in degrading these pollutants,this study employed an electro-Fenton coagulation-precipitation coupled process to treat NCL wastewater.The objective of this study was to rapidly remove refractory pollutants and mitigate the environmental risks associated with its discharge.The current density,electrolyte(Na2SO4)dosage,initial pH,hydrogen peroxide(H2O2)dosage,temperature,and electrode spacing in the electro-Fenton process,and the flocculation-precipitation process parameters including flocculation pH environment,flocculant(polyacrylamide,PAM)dosage,flocculation speed,and duration were optimized.Subsequently,the response surface methodology was used to determine the optimal operating parameters for the electro-Fenton coagulation-precipitation coupled process.The results indicated that under the conditions of a current density of 34.1 mA·cm-2,Na2SO4 dosage of 8.1 g,initial pH of 3.2,H2O2 dosage of 17.6 mL,temperature of 38.5℃,and electrode spacing of 4.6 cm in the electro-Fenton reactor with an effective volume of 1.2 L,the removal rate of COD from NCL reaches 90.4％in 120 min.Following this,an additional reduction of approximately 7.3％in COD was achieved from NCL wastewater through the coagulation-precipitation process at pH of 12.6,with a 1％mass concentration of PAM added(8.8 mL),a flocculation speed of 247.0 r·min-1,and a flocculation time of 60.0 min.In conclusion,the electro-Fenton coagulation-precipitation coupled process employed in this study achieved a removal rate for COD in NCL wastewater.This process effectively reduced the biological toxicity of the wastewater from high toxicity(luminescence inhibition rate of 87.2％)to low toxicity(luminescence inhibition rate of 87.2％),thereby significantly mitigating the environmental discharge risks associated with nanofiltration concentrate of leachate.关键词
垃圾渗滤液纳滤浓缩液/电Fenton/絮凝沉淀/响应面法Key words
nanofiltration concentrate of leachate/electro-Fenton/coagulation-precipitation/response surface methodology分类
资源环境引用本文复制引用
潘杨锐,梁慧宇,赵晴,陈奔,孙连鹏,叶从容,徐兴泉,廖嘉俊,吕慧..电Fenton-絮凝沉淀耦合工艺处理垃圾渗滤液纳滤浓缩液[J].环境工程学报,2025,19(7):1627-1640,14.基金项目
国家自然科学基金资助项目(42077155) （42077155）
广州市科技计划资助项目(2024A04J4372) （2024A04J4372）
2021年佛山市社会领域科技攻关专项(2120001008746) （2120001008746）
