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
黄建洪 1张亘 2赵世民 3朱彬 2程明豪 2谢鑫 2田森林 1宁平1
作者信息
- 1. 昆明理工大学 环境科学与工程学院,云南 昆明 650500;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
- 2. 昆明理工大学 环境科学与工程学院,云南 昆明 650500
- 3. 云南省生态环境科学研究院,云南 昆明 650034;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
- 折叠
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/cm2、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%,UV254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.
Abstract
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 sys-tem 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/cm2,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%,UV254 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 microelectrolys-is,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 refracto-ry 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Key words
coffee processing wastewater/three-dimensional electro-Fenton/hydroxyl radical/organic pollu-tants/biodegradability引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据