| 甘信宏,郭书海,徐文迪,李刚,李凤梅.电芬顿泥浆反应器中羟基自由基生成影响因素分析[J].农业环境科学学报,2015,34(1):44-49. |
| 电芬顿泥浆反应器中羟基自由基生成影响因素分析 |
| Analysis of Factors Influencing Hydroxyl Radical Formation in Electro-Fenton Slurry Reactor |
| 投稿时间：2014-08-25 |
| DOI：10.11654/jaes.2015.01.007 |
| 中文关键词: 电芬顿泥浆反应器 羟基自由基 影响因素 水杨酸 2,5-二羟基苯甲酸 |
| 英文关键词: Electro-Fenton slurry reactor hydroxyl radical influencing factor salicylic acid 2,5-Dihydroxybenzoic acid |
| 基金项目:国家863课题(2013AA06A210);国家水体污染控制与治理科技重大专项(2013ZX07202-007);国家自然科学基金(21207138) |
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| 中文摘要: |
| 泥浆化是有机污染土壤修复中一种高效、快速的处理方法.将泥浆化与电芬顿联合,可对有机污染土壤进行氧化修复处理.采用高效液相色谱法,以水杨酸为羟基自由基(·OH)捕获剂,探讨电芬顿泥浆反应器中影响·OH生成量和检出准确度的关键因素.结果表明,向反应器内加入适量电解质(无水硫酸钠),浓度控制在5 g·L-1左右,可增加·OH生成量,且可在较长时间内使·OH瞬时浓度维持在较高水平;反应器内泥浆初始pH为3时,生成·OH的量大于初始pH为5和11时的生成量;装置中电极间距为5 cm时,生成·OH的量最高;加入适量水杨酸溶液,控制初始浓度在400 μmoI·L-1,可以较准确地间接表征瞬时·OH生成量.芘污染供试土壤的削减实验证明,加入适量的有机物可以减少·OH的自身淬灭.采用电芬顿泥浆化技术,在适当的条件下可生成大量的·OH,从而快速有效地削减有机污染物. |
| 英文摘要: |
| Slurrying has been proven to be an effective and efficient pretreatment method for remediating organic contaminated soils. Combined slurrying and Electro-Fenton treatment procedures may be used to remediate these soils via oxidation. This study investigated key factors influencing ·OH generation and detection accuracy in Electro-Fenton based slurry bioreactor. Salicylic acid was adopted as ·OH trapping reagent. The rate of ·OH generation was increased and maintained at a high level when electrolyte (anhydrous sodium sulfate) was maintained at 5 g·L-1. Higher concentrations of ·OH was found in the samples with initial pH at 3 than at 5 and 11. Also, the highest amount of ·OH was obtained at 5 cm of electrode spacing. The instantaneous generation rate of ·OH could be calculated accurately when the concentration of salicylic acid was kept at 400 μmoI·L-1. Remediation experiments on pyrene-contaminated soil showed that adding certain amount of organic matter could reduce ·OH quenching. The results indicate that Electro-Fenton process could produce large amounts of ·OH under appropriately controlled environment, and thereby degrade organic pollutants rapidly |
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