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371.
Dai Qili Li Liwei Yang Jiamei Liu Baoshuang Bi Xiaohui Wu Jianhui Zhang YuFen Yao Lin Feng Yinchang 《Environmental science and pollution research international》2016,23(17):17191-17199
Environmental Science and Pollution Research - Improved understanding of the fractionation and geochemical characteristic of rare earth elements (REEs) from steel plant emissions is important due... 相似文献
372.
张杨 《中国环境管理干部学院学报》2016,(4):80-84
以Fenton试剂氧化结合混凝法对焦化厂熄焦循环水COD进行快速去除实验,结果证明:当[Fe2+]/[H2O2]为1∶15,初始p H为3,30%H2O24.5 ml/100 ml废水时,反应90 min,COD去除率可达到90%,满足回用标准。但是,此时水的颜色较深,继续调节p H至7,加入Fe C13140 mg/L,PAM(聚丙烯酰胺)5 mg/L,搅拌5 min,静置30 min,COD去除率可达95.4%。Fenton-混凝对低浓度NH3-N几乎没有去除作用,CN-的去除率接近30%。整个处理过程中,有机物的种类和数量发生较大变化,Fenton氧化120 min后,混凝,污水基本接近无色,但仍含有单环芳香族化合物。 相似文献
373.
Yi-Tang Chang Jiunn-Fwu Lee Keng-Hua Liu Yi-Fen Liao Vivian Yang 《Environmental science and pollution research international》2016,23(5):4024-4035
Nonionic surfactant-modified clay is a useful absorbent material that effectively removes hydrophobic organic compounds from soil/groundwater. We developed a novel material by applying an immobilized fungal laccase onto nonionic surfactant-modified clay. Low-water-solubility polycyclic aromatic hydrocarbons (PAHs) (naphthalene/phenanthrene) were degraded in the presence of this bioactive material. PAH degradation by free laccase was higher than degradation by immobilized laccase when the surfactant concentration was allowed to form micelles. PAH degradation by immobilized laccase on TX-100-modified clay was higher than on Brij35-modified clay. Strong laccase degradation of PAH can be maintained by adding surfactant monomers or micelles. The physical adsorption of nonionic surfactants onto clay plays an important role in PAH degradation by laccase, which can be explained by the structure and molecular interactions of the surfactant with the clay and enzyme. A system where laccase is immobilized onto TX-100-monomer-modified clay is a good candidate bioactive material for in situ PAHs bioremediation. 相似文献
374.
Shaonan Hao Xuyong Li Yan Jiang Hongtao Zhao Lei Yang 《Environmental science and pollution research international》2016,23(18):17953-17968
The rapid growth of urbanization and industrialization, along with dramatic climate change, has strongly influenced hydrochemical characteristics in recent decades in China and thus could cause the variation of pH and general total hardness of a river. To explore such variations and their potential influencing factors in a river of the monsoon climate region, we analyzed a long-term monitoring dataset of pH, SO4 2?, NOx, general total hardness (GH), Mg2+, Ca2+, and Cl? in surface water and groundwater in the Luan River basin from 1985 to 2009. The nonparametric Seasonal Kendall trend test was used to test the long-term trends of pH and GH. Relationship between the affecting factors, pH and GH were discussed. Results showed that pH showed a decreasing trend and that GH had an increasing trend in the long-term. Seasonal variation of pH and GH was mainly due to the typical monsoon climate. Results of correlation analysis showed that the unit area usage amounts of chemical fertilizer, NO3 ?, and SO4 2? were negatively correlated with pH in groundwater. In addition, mining activity affected GH spatial variation. Acid deposition, drought, and increasing the use of chemical fertilizers would contribute to the acidification trend, and mining activities would affect the spatial variation of GH. Variations of precipitation and runoff in semi-arid monsoon climate areas had significant influences on the pH and GH. Our findings implied that human activities played a critical role in river acidification in the semi-arid monsoon climate region of northern China. 相似文献
375.
Dian Yu Jing Yang Ting Li Jianfang Feng Qiming Xian Jiping Zhu 《Environmental science and pollution research international》2015,22(9):6601-6609
The occurrence and spatial distribution of dechloranes including mirex, dechlorane plus (DP), dechlorane (Dec) 602, Dec 603, and Dec 604 in surficial sediments of Lake Taihu were investigated in this study. The concentrations of mirex and DP ranged from below detection limit (BDL) to 1.29 ng g?1 dw and 0.051 to 2.10 ng g?1 dw, respectively. Dec 602, Dec 603, and Dec 604 on the other hand, were BDL in any of the samples. The contamination levels of DP were higher than that of Mirex at 21 of all 22 sampling sites. Levels of mirex and DP in the lake sediments were correlated when an extremely high mirex value was removed. Both mirex and DP levels were correlated with the amount of organic matters in the sediment samples. Spatial distribution of mirex and DP suggested that these two chemicals in the lake had similar input sources except for one site. Comparison to previously reported flame retardants’ levels in the sediments shows that DP levels were similar with the levels of tetrabromobisphenol A, hexabromocyclododecane but lower than PBDEs and organophosphates levels in Lake Taihu. The higher levels in the north-east part of Lake Taihu adjacent to two major cities: Wuxi and Suzhou, indicated that city effluent might be a major source for DP contamination in the lake. 相似文献
376.
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378.
从自然环境中分离到2株对染料活性红M-3BE具有明显脱色效果的真菌,经形态学和26S rDNA序列分析,将其鉴定为Fusarium oxysporum和Geosmithia viridis.采用初始浓度50 mg/L M-3BE的液体培养基同步脱色培养,F.oxysporum在24 h内对M-3BE的脱色率为96%,G.viridis在36 h内的脱色率为82%.对脱色酶系的检测结果表明,脱色过程中F.oxysporum能产生LiP和MnP,G.viridis则仅产生LiP.此外,F.oxysporu和G.viridis对另外7种染料的脱色率也可分别达到16%~100%和83.3%~100%. 相似文献
379.
氧化沟反应器流体力学特性的数值模拟与实验研究 总被引:5,自引:1,他引:4
采用CFD数值计算和体视PIV测试相结合的方法研究卡鲁塞尔氧化沟反应器流场特性。探索复杂边界条件下反应器流场的模拟方法,采用体视PIV技术分别测量了反应器直道、弯道处三维全场流速;研究不同位置处纵、横、垂三向的流动结构和沿程分布特点。结果表明,模拟与实验结果较吻合;纵、垂两向的流动分布是决定沟内水力特性的主要因素;横、垂两向的流动是决定污泥沉积位置的主要因数;外沟靠近曝气叶轮直道段的流速分布上大下小,在低速区底部易发生污泥沉积;外沟远离曝气叶轮直道段流速分布上小下大,利于防止泥水分离;弯道段受横比降和横向环流的影响,内侧容易形成低速区或停滞区而发生污泥沉积。 相似文献
380.