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引用本文:章萍,相明雪,马若男,刘强,葛刚,钱光人.底泥就地稳定化中零价铁(Fe0)对有机污染物的作用及其对上覆水体水质的影响.湖泊科学,2018,30(5):1218-1224. DOI:10.18307/2018.0505
ZHANG Ping,XIANG Mingxue,MA Ruonan,LIU Qiang,GE Gang,QIAN Guangren.Effect of zero-valent iron on organic pollutants in sediment and the related overlying water during in-situ treatment. J. Lake Sci.2018,30(5):1218-1224. DOI:10.18307/2018.0505
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底泥就地稳定化中零价铁(Fe0)对有机污染物的作用及其对上覆水体水质的影响
章萍1, 相明雪1, 马若男1, 刘强1, 葛刚1, 钱光人2
1.南昌大学资源环境与化学工程学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031;2.上海大学环境与化学工程学院, 上海 200444
摘要:
在实验室模拟静态湖泊体系条件下,通过向实际底泥中投加零价铁(Fe0),考察反应前后底泥中有机物数量、种类、总有机质含量以及上覆水体溶解氧(DO)浓度、氧化还原电位(Eh)、pH和化学需氧量(CODCr)浓度等指标的变化,探讨Fe0对底泥有机物的降解效果以及对上覆水体水质的影响.结果表明,投加Fe0处理80 d后,①经GC-MS检测出底泥中易被降解的小分子有机物(分子量小于200)数量明显增多,底泥总有机去除率为44%.②上覆水体的DO浓度、Eh和pH都有不同程度的变化.DO浓度从6.6 mg/L迅速下降至0.2 mg/L,Eh从150 mV左右下降至74 mV,pH升高至8.4,此体系易形成厌氧环境;且上覆水体中CODCr低于纯底泥水体系,上覆水中DO浓度、Eh及pH与CODCr浓度具有一定相关性.综上,底泥中投加Fe0可有效降解有机物,且不会对上覆水体产生持久、较大的影响.
关键词:  就地稳定  零价铁(Fe0)  底泥  有机污染物  上覆水
DOI:10.18307/2018.0505
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07301002-05)和国家自然科学基金项目(21467014,21767018)联合资助.
Effect of zero-valent iron on organic pollutants in sediment and the related overlying water during in-situ treatment
ZHANG Ping1, XIANG Mingxue1, MA Ruonan1, LIU Qiang1, GE Gang1, QIAN Guangren2
1.Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, P. R. China;2.College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China
Abstract:
Based on the laboratory simulates a static lake system, the removal of organic pollutants in sediments using zero-valent iron (Fe0) for in-situ sediment treatment was studied. The effects of zero valent iron (Fe0) on the overlying water including DO, Eh, pH and CODCr were investigated and the effects on the sediments including the number and kinds of organic pollutants, total organic content were discussed. The results showed that with adding Fe0 for treating 80 days, ① the amount of low-molecular-weight organics (of below 200) were increasing apparently which could be easy to degrade detecting by GC-MS. The removal rate of organic content in sediments was around 44%. ② the value of pH was rising to 8.4, while the Eh was declining from 150 mV to 74 mV and the DO concentration of overlying water depleted dramatically from 6.6 mg/L to 0.2 mg/L. The system formed an anaerobic environment. CODCr concentration of overlying water was lower than that in pure bottom-water system. In addition, there were certain relations among DO, Eh, pH and CODCr in overlying water. In conclusion, the removal of organic pollutants was effective by adding Fe0 in the sediments, and this effect on overlying water quality was not permanent and seriously.
Key words:  In-situ sediment treatment  zero-valent iron (Fe0)  sediment  organic pollutants  overlying water
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