引用本文:孟海玲,刘庭蕾,刘再亮,朱丽莎,等.电-Fenton法降解低含盐量反渗透浓缩液中腐植酸[J].环境科学研究,2018,31(1):154-160.
MENG Hailing,LIU Tinglei,LIU Zailiang,ZHU Lisha,et al.Highly Efficient Degradation of Humic Acid in Low Salinity Reverse Osmosis Concentrate by Electro-Fenton Process[J].Reserrch of Environmental Science,2018,31(1):154-160.]
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电-Fenton法降解低含盐量反渗透浓缩液中腐植酸
孟海玲, 刘庭蕾, 刘再亮, 朱丽莎
安徽工业大学能源与环境学院, "生物膜法水质净化及利用技术"教育部工程研究中心, 安徽 马鞍山 243000
摘要:
为研究采用碳毡-Pt电-Fenton体系处理模拟低含盐量反渗透浓缩液中的腐植酸的影响因素和降解机制,通过单因素试验,以CODCr去除率为评价指标,以Fe2+添加量、通氧量、电流密度、pH为考察因素,探讨了不同条件对电-Fenton体系ρ(H2O2)和CODCr去除率的影响.结果表明:采用电-Fenton法降解模拟反渗透浓缩液,较低的含盐量有助于CODCr的去除,与高含盐量(1 000~2 000 mg/L)相比,在低含盐量(500~1 000 mg/L)条件下CODCr去除率提高10%~20%;并且最佳条件下实际电流效率(GCE)达到15.6%,电化学能耗为32 kW·h/kg.最佳反应条件:通氧量为0.3 m3/L,Fe2+添加量为0.1 mmol/L,电流密度为3.5 mA/cm2,pH=3,在该条件下反应180 min时,电-Fenton体系产生的ρ(H2O2)为105 mg/L,可使ρ(CODCr)由150 mg/L降至16 mg/L,CODCr去除率达到90%.研究显示,较宽的pH范围(3~7)内碳毡-Pt电-Fenton体系对腐植酸的降解表现稳定,CODCr去除率均达到60%以上.
关键词:  反渗透浓缩液  电-Fenton  H2O2  CODCr  腐植酸
DOI:10.13198/j.issn.1001-6929.2017.03.40
分类号:X703.1
基金项目:安徽省科技攻关计划项目(11010401010);安徽工业大学研究生创新基金(2013037)
Highly Efficient Degradation of Humic Acid in Low Salinity Reverse Osmosis Concentrate by Electro-Fenton Process
MENG Hailing, LIU Tinglei, LIU Zailiang, ZHU Lisha
School of Energy and Environment School, ‘Water Purification and Utilization Technology of Biofilm Process’ Engineering Research Center of Ministry of Education, Anhui University of Technology, Maanshan 243032, China
Abstract:
The influencing factors and mechanism of the degradation of humic acid in simulated low salinity reverse osmosis concentrate was studied by the electro-Fenton process with carbon felt-Pt as electrode. The factors influencing the production of H2O2 and CODCr removal were investigated and the results showed that the electro-Fenton process effectively degraded contaminants, and that higher CODCr removal rate obtained with lower salinity within reverse osmosis concentrate. When the salt content in the solution was lower (500-1000 mg/L), the removal rate of CODCr increased by 10% to 20% compared with the high salinity (1000-2000 mg/L). The general current efficiency (GCE) and electrochemical energy cost (EEC) reached about 15.6% and 32 kW·h/kg CODCr, respectively under optimum conditions with oxygen uptake of 0.3 m3/L, Fe2+ dosage of 0.1 mmol/L, current density of 3.5 mA/cm2, and pH 3. The concentration of H2O2 produced by the electro-Fenton process reached 105 mg/L within 180 min, resulting in the concentration of CODCr reduced from 150 mg/L to 16 mg/L, corresponding to 90% CODCr removal. Moreover, the process showed a stable performance in a wide pH range from 3 to 7 and the CODCr removal percentage reached higher than 60%.
Key words:  reverse osmosis concentrate  electro-Fenton  H2O2  CODCr  humic acid