松辽盆地浅层含水层中含铁矿物对萘的吸附特征研究
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摘要
为了研究我国寒区普遍存在的地下水有机污染物-多环芳烃萘在浅层地下水中的降解过程,本次以松辽盆地某石油污染场地为研究区,采用分析纯的石英砂和典型含铁矿物磁铁矿、菱铁矿及绿泥石模拟含水层中的矿物,通过室内静态吸附批次实验,模拟污染场地低温地下水环境,探究萘在下不同类型含铁矿物上的吸附行为。研究结果表明:磁铁矿、菱铁矿和绿泥石对萘的吸附量由大到小依次为磁铁矿>菱铁矿>绿泥石,平衡吸附量分别为1.503、1.049和0.756 mg/g。含铁矿物对萘的吸附等温曲线符合Langmuir方程,属于表面分子吸附。在含铁矿物质量分数为20%时,溶液中二价铁离子浓度变化明显,表明铁离子参与矿物吸附过程。本次研究以含铁矿物的吸附为出发点,通过实验模拟低温浅层含水层中含铁矿物对萘的吸附,探究不同含铁矿物在低温条件下对萘的吸附性能,可以为我国北方其他温度相对较低的地区提供借鉴。
In order to study the degradation process of polycyclic aromatic hydrocarbon naphthalene(PAH-naphthalene) in shallow groundwater, a petroleum-contaminated site in Songliao Basin is selected as the study area. The pure quartz sand and typical iron-containing minerals magnetite, siderite and chlorite are used to simulate the minerals in aquifers. The adsorption behavior of naphthalene on different types of iron ore is studied by simulating the low-temperature groundwater environment in contaminated sites through batch experiments. The results show that the adsorption capacity of magnetite, siderite and chlorite to naphthalene is magnetite > siderite > chlorite from large to small, and the equilibrium adsorption capacity is 1.503, 1.049 and 0.756 mg/g, respectively. The adsorption isotherm of naphthalene accords with Langmuir equation and belongs to surface molecular adsorption. When the mass fraction of iron-containing minerals is 20%, the concentration of divalent iron ions in the solution changes obviously, indicating that iron ions participate in the mineral adsorption process. Based on the adsorption of iron-containing minerals, this study simulates the adsorption of naphthalene by iron-containing minerals in shallow aquifer at low temperature, and explores the adsorption performance of naphthalene by different iron minerals at low temperature, which serves as a reference for other areas with relatively low temperature in North China.
In order to study the degradation process of polycyclic aromatic hydrocarbon naphthalene(PAH-naphthalene) in shallow groundwater, a petroleum-contaminated site in Songliao Basin is selected as the study area. The pure quartz sand and typical iron-containing minerals magnetite, siderite and chlorite are used to simulate the minerals in aquifers. The adsorption behavior of naphthalene on different types of iron ore is studied by simulating the low-temperature groundwater environment in contaminated sites through batch experiments. The results show that the adsorption capacity of magnetite, siderite and chlorite to naphthalene is magnetite > siderite > chlorite from large to small, and the equilibrium adsorption capacity is 1.503, 1.049 and 0.756 mg/g, respectively. The adsorption isotherm of naphthalene accords with Langmuir equation and belongs to surface molecular adsorption. When the mass fraction of iron-containing minerals is 20%, the concentration of divalent iron ions in the solution changes obviously, indicating that iron ions participate in the mineral adsorption process. Based on the adsorption of iron-containing minerals, this study simulates the adsorption of naphthalene by iron-containing minerals in shallow aquifer at low temperature, and explores the adsorption performance of naphthalene by different iron minerals at low temperature, which serves as a reference for other areas with relatively low temperature in North China.
引文
[1] 秦雨.浅层地下水中萘的迁移转化机理及模拟预测研究[D].长春: 吉林大学,2010.
[2] 吕航.地下水石油烃污染物的微生物降解过程及其原位强化修复研究[D].长春:吉林大学,2014.
[3] 吴庭雯.四环素与含水层中常见铁氧化物矿物的相互作用机理研究[D].北京:中国地质大学,2017.
[4] 张晶,何江涛,曲雪妍,等.包气带土壤组成对三氯乙烯的吸附影响研究[J]. 岩石矿物学杂志,2010,(4) :439-444.
[5] 王云中,王天玉,杨成建,等.Tween-80 对萘在3 种金属氧化物上吸附的影响[J]. 环境工程学报,2017,(4) :2 132-2 136.
[6] Liu D,Dong H,Zhao L,et al.Smectite reduction by Shewanella species as facilitated by cysteine and cysteine[J].Geomicrobiology Journal,2014,31;53-63.
[7] Wu H H, Lu Y L, Du J, et al. The effects of mineral sur-faces in red soils upon the sorption of naphthalene by humics[J]. Acta Petrologica et Mineralogica, 2007,26(6):539-543.
[2] 吕航.地下水石油烃污染物的微生物降解过程及其原位强化修复研究[D].长春:吉林大学,2014.
[3] 吴庭雯.四环素与含水层中常见铁氧化物矿物的相互作用机理研究[D].北京:中国地质大学,2017.
[4] 张晶,何江涛,曲雪妍,等.包气带土壤组成对三氯乙烯的吸附影响研究[J]. 岩石矿物学杂志,2010,(4) :439-444.
[5] 王云中,王天玉,杨成建,等.Tween-80 对萘在3 种金属氧化物上吸附的影响[J]. 环境工程学报,2017,(4) :2 132-2 136.
[6] Liu D,Dong H,Zhao L,et al.Smectite reduction by Shewanella species as facilitated by cysteine and cysteine[J].Geomicrobiology Journal,2014,31;53-63.
[7] Wu H H, Lu Y L, Du J, et al. The effects of mineral sur-faces in red soils upon the sorption of naphthalene by humics[J]. Acta Petrologica et Mineralogica, 2007,26(6):539-543.