基于三维电芬顿法的咖啡初加工废水有机物去除特性分析  

Analysis of Organic Properties of Coffee Processing Wastewater Based on Three-Dimensional Electro-Fenton Method

作　　者：黄建洪[1,2] 张亘 赵世民 朱彬 程明豪 谢鑫 田森林 宁平[1,2] HUANG Jianhong;ZHANG Gen;ZHAO Shimin;ZHU Bin;CHENG Minghao;XIE Xin;TIAN Senlin;NING Ping(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;National Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries,Kunming 650500,China;Yunnan Research Academy of Eco-environmental Sciences,Kunming 650034,China;Yunnan Key Laboratory for Pollution Processes and Control of Plateau Lake-Watersheds,Kunming 650034,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500 [2]冶金与化工行业废气资源化国家地方联合工程研究中心,云南昆明650500 [3]云南省生态环境科学研究院,云南昆明650034 [4]云南省高原湖泊流域污染过程与管理重点实验室,云南昆明650034

出　　处：《昆明理工大学学报（自然科学版）》2024年第3期239-249,共11页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：长江生态环境保护修复城市驻点跟踪项目(2022-LHYJ-02-0511);国家重点研发计划课题(2023YFC3709105).

摘　　要：针对咖啡初加工废水有机物浓度高、难降解、可生化性差等问题,构建了钛基镀钌铱电极为阳极板、泡沫镍为阴极板、铁碳粒子为粒子电极的三维电芬顿体系,对咖啡初加工废水进行预处理.通过单因素实验发现,当板间距为4 cm、初始pH为4.0、电流密度为32 mA/cm^(2)、粒子电极投加量为20 g/L、曝气强度为4 L/min、反应时间为90 min的条件下,咖啡初加工废水COD去除率可达69.29%,UV 254去除率可达72.92%,色度去除率可达96.69%,B/C从0.28提升至0.43.通过对比铁碳微电解、传统电芬顿和三维电芬顿对咖啡初加工废水COD去除效果发现,三维电芬顿体系物质传递速率以及传质效果都有大幅提升.通过自由基淬灭实验、三维荧光光谱、傅里叶红外光谱和GC-MS分析,发现羟基自由基在咖啡初加工废水的降解过程中起主导作用,原水中90种有机污染物降至39种,难降解腐殖酸类大分子有机物已经得到了较为彻底地去除,大部分被降解为小分子有机物,可生化性得到大幅提高.The study established a three-dimensional electro-Fenton system for coffee processing wastewater,aimed at the issues of high concentration of organic matter,difficult degradation and poor biochemistry.The system utilized titanium-based ruthenium-iridium electrode as the anode plate,nickel foam as the cathode plate,and iron-carbon particles as the particle electrodes.Through single-factor experiments,it was found that under the conditions of plate spacing of 4 cm,initial pH of 4.0,current density of 32 mA/cm^(2),particle electrode dosage of 20 g/L,aeration intensity of 4 L/min,and reaction time of 90 min,the COD removal rate of coffee processing wastewater can reach to 69.29%,UV 254 removal rate can reach to72.92%,color removal rate can reach to 96.69%,and B/C ratio was improved from 0.28 to 0.43.Comparing the effects of iron-carbon microelectrolysis,traditional electro-Fenton and three-dimensional electro-Fenton on removing COD from coffee processing wastewater,it was observed that the three-dimensional electro-Fenton system significantly improved material transfer rate and mass transfer effect.The varieties of organic pollutants were reduced from 90 to 39,and refractory humic acid macromolecular organic compounds were almost completely removed,mainly degraded into small molecular organic compounds,greatly improving biodegradability.

关 键 词：咖啡初加工废水 三维电芬顿 羟基自由基 有机污染物 可生化性 

分 类 号：X821[环境科学与工程—环境工程] X792