H_2O_2/Fe~(2+)和H_2O_2/Fe~(2+)/UV对废水焦糖色去除

为去除废水中的焦糖色素,采用H2O2/Fe2+和H2O2/Fe2+/UV对焦糖色素去除进行研究.实验考察了H2O2和Fe2+投加量、pH值、反应时间对焦糖色素去除率的影响,在此基础上进一步考察了H2O2/Fe2+/UV对焦糖色素去除效果.结果表明,对于芬顿试剂,H2O2与Fe2+反应的化学计量数为8;pH值为3,反应时间30 m in时,焦糖色的去除效果较好,去除率达到83%.采用H2O2/Fe2+/UV可进一步提高焦糖色的去除效果,去除率可提高到90%.因此采用H2O2/Fe2+或H2O2/Fe2+/UV法获得良好的焦糖色去除效果.     

硫酸盐还原菌处理镍磁黄铁矿硫酸浸出废水

从高碑店污水处理厂的活性污泥中分离纯化得到硫酸盐还原菌(sulfate-reducing bacteria,SRB),并以稻壳作为吸附载体将其固定在连续上升流厌氧填充床反应器中,处理镍磁黄铁矿硫酸浸出废水中的金属离子,同时研究不同进样速率下SRB对Ni2+和Fe2+的去除率及出水pH的变化.实验结果表明:当废水中Ni2+和Fe2+初始质量浓度分别为190mg/L和110mg/L、进样速率为2 200 mL/(d.L)(水力停留时间630min)、pH为5.6时,出水中Ni2+和Fe2+质量浓度分别为0.4～1.0 mg/L和0.3 mg/L,去除率(质量分数)在99％以上;单位反应器容积对Ni2+和Fe2+的去除率分别可达418～684 mg/(d·L)和242～396mg/(d·L),且处理效率稳定;出水pH达到7.2,且稳定运行.随着进水速率的增加,Ni2+和Fe2+去除率逐渐降低,当进样速率增大到9 000 mL/(d·L)(水力停留时间130min)时,SRB对Fe2+的去除率在90％左右,而Ni2+的去除效率仅为75％;出水pH仅能达到6.4.     

NaClO/Fe2+氧化法深度处理草浆造纸废水实验研究

采用NaClO/Fe2+氧化法深度处理经厌氧、好氧处理后的草浆造纸废水,通过正交实验和单因素试验,研究了各主要因素对废水COD去除效果的影响,确定了最佳工艺条件.结果表明:NaClO/Fe2+法对COD去除率影响的顺序为:NaClO用量＞Fe2+用量＞反应时间;在进水COD浓度为340 mg/L,pH值为7～8.3、1...     

铁锰氧化菌的筛选及其生物学特性研究

利用选择性培养基对所得样品进行平板初筛和摇瓶复筛,进一步研究所得菌株生物学特性及生长曲线和氧化曲线,设置不同的pH梯度和温度梯度考察对菌种生长的影响.成功地从12个样品中分离得到2株高效铁锰氧化细菌,在含铁离子和锰离子分别为160 mg/L和65 mg/L的培养液中,对Fe2+去除率接近100%,对Mn2+去除率达85%以上,表明2株菌均为革兰氏阴性菌.铁的去除时间与菌体对数生长期相对应,而锰的去除稍迟,表明25～28 ℃,pH6.8～7.5为菌体最佳生长条件.     

β-环糊精交联聚合物对两种重金属处理研究

采用经改性的β-环糊精对重金属废水进行处理,分析了其对Fe2+、Cu2+、两种重金属离子的去除效果,并研究了β-环糊精交联聚合物投加量、温度、反应时间、p H值等因素对实验效果的影响.实验结果表明,β-环糊精的交联聚合物对Fe2+的去除率可以达到95.8%,对Cu2+的去除率为25.9%.     

铁铝酸四钙对矿井水中SO_4~(2-)的去除研究

针对山西省煤矿矿井水的水质特性,研究通过混凝吸附作用对矿井水中SO42-的去除效果,通过实验,发现在pH=7～9时,采用Ca(OH)2+铁铝酸四钙(4CaO·Al2O3·Fe2O3)+少量PAM的药剂投加方式,对矿井水中降低SO42-效果较好.     

UV/Fenton试剂处理高浓度含酚废水的实验研究

研究UV/Fenton试剂中各个因素对降解高浓度含酚废水的影响,确定UV/Fenton法处理高浓度含酚废水的最佳工艺条件.保持UV/Fenton体系的基准条件不变,通过改变pH值、H2O2浓度、Fe2+浓度、反应时间等实验条件,考察这些因素对UV/Fenton法处理高浓度含酚废水效果的影响.结果表明,UV/Fenton试剂对高浓度舍酚废水有较好的去除效果和较高的反应速率.当苯酚初始浓度为1 000 mg/L时,紫外光波长为253.7 nm,反应时间为25～40 min,pH值为6～7,H2O2浓度为40～50 mmol/L,Fe2+浓度为28～30 mg/L时,苯酚去除率可迭90%以上,满足后续生物降解要求.     

Fenton试剂氧化法深度处理青霉素废水

采用Fenton氧化技术深度处理青霉素废水,通过单因素试验,研究了pH、H2O2/Fe2+的摩尔比值、H2O2的投加量和反应时间T,4个因素对COD的去除效果及各因素间影响.结果表明:处理废水的最佳条件为废水初始pH为3,H2O2/Fe2+的摩尔比值为1∶1,H2O2的投加量为300 mg/L,反应时间为60 min,此时COD的去除率高达59%左右.在单因素基础上,使用Design Expert软件设计,通过二次回归得到COD去除率与废水的初始pH,H2O2/Fe2+的摩尔比,H2O2的投加量关系的回归模型,该模型能够较好地预测COD的去除率.同时,3个因素对COD去除效果的影响排序为H2O2投加量>H2O2/Fe2+的摩尔比>溶液初始pH,最后得到的优化参数为:pH为2.98,H2O2/Fe2+的摩尔比为0.76∶1,H2O2的浓度为295.10 mg/L,此时COD的去除率为57.415 5%.     

改性膨润土协同H_2O_2去除电镀废水次磷酸盐研究

本研究通过模拟电镀酸洗溶液改性膨润土,提高膨润土表面Fe2+含量,然后通过H_2O_2协同类Fenton氧化作用将某企业电镀废水中的次磷酸盐氧化为磷酸盐,再通过铁离子络合沉淀作用将磷酸盐吸附到膨润土上.实验结果表明:300 mg改性膨润土+10 mL 3. 0%H_2O_2协同氧化去除电镀废水中的磷酸盐(108. 6 mg/L)30 min,去除率为95. 6%.     

锰细菌氧化锰的影响因素研究

研究了锰细菌Arthrobacter sp. MN1405的生长、氧化曲线及影响其氧化锰的各种理化因素.结果表明:接种量、装液量、温度、pH、Mn2+质量浓度、Fe2+质量浓度、摇床转速等因素对锰氧化率有不同程度的影响.在培养基装液量为250mL的三角瓶装80mL,初始Mn2+质量浓度65mg/L,温度25℃,pH6.8,接种量6%,120r/min的条件下培养6d后,锰的总氧化率可达80%以上.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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