电絮凝-微滤去除饮用水中的氟

饮用水中的氟离子对人体具有重要意义。该文采用电絮凝-微滤组合工艺技术,去除饮用水中超量的氟离子,并探讨电流密度、极板间距、pH值对除氟效果的影响。实验表明:电絮凝-微滤组合技术除氟效果明显;水中氟离子浓度的对数值与反应时间呈线性关系。所研究的电絮凝反应器的最佳工作参数为:电流密度σ=15.8 A/m2,极板间距d=1.0 cm,pH值在5.7～7.0范围内。水中SO42-和PO43-离子的存在会影响除氟效率,而阳离子Fe3 、Mg2 、Ca2 在一定程度上促进除氟反应的进行。     

电絮凝-微滤法去除水中腐殖酸的实验研究

采用电絮凝-微滤组合工艺技术去除水中过量的腐殖酸,探讨了电流密度、极板间距和pH值对去除腐殖酸效果的影响.结果表明,电絮凝-微滤组合技术去除腐殖酸效果明显,电絮凝反应器的最佳工作参数为电流密度=3.17 A.m-2,极板间距=1.0 cm,pH值在酸性范围内.     

电絮凝法处理电镀废水中Crn+、Cu2+、Zn2+的试验

针对电镀废水对生态环境的严重污染问题,提出了铝板作为极板的电絮凝设备处理电镀废水中的重金属离子Crn+、Cu2+、Zn2+,研究了初始pH值、电流密度、电极间距等因素对处理效果的影响.试验结果表明,在电絮凝过程中,初始pH值在4-8之间时,金属离子的去除率最好,但当初始pH值超过8时,铬的去除率有所下降;并且随着电流密...     

电絮凝法处理含聚采油污水的研究

研究采用电絮凝法处理含聚采油污水,优化了电极材料、极板间距、电流密度、pH和电解时间等对污水COD和聚合物去除率有影响的因素.研究确定的电絮凝法处理含聚采油污水的最优工艺条件为:电流密度为7mA/cm2,电解时间40min,极板间距2 cm,pH 9.1.于最优条件下处理后COD和聚合物的去除率分别为68.5%和49.7%.     

农村生活污水除磷技术研究

磷是水体富营养化的主要限制因素,因此控制磷的浓度尤为重要。针对农村生活污水的除磷技术,该文考究了电絮凝实验方法对除磷的效果,结果表明,在经过考察水力停留时间、电流密度、电极间距等因素对除磷的影响,除磷效果很显著;HRT=15min、7.68mA/cm~2、极板间距为18mm时,出水水质的TP均在0.5mg/L以下。使其设备的出水水质达到GB18918-2002一级A标准。     

电絮凝法深度处理垃圾渗滤液的效能和工艺强化

采用电絮凝法处理生化处理后的垃圾渗滤液,考察铁铝电极的组合方式、极板间距、电流密度对渗滤液中COD、UV254、色度和磷去除效果的影响.研究发现,在最佳反应条件下,即铁电极、极板间距4 mm、电流密度为5.487 A/m2、反应1 h,对磷、COD、UV254和色度的去除率分别达到99.4％、61.2％、37.0％、7...     

强化混凝去除饮用水源水中的氟

以硫酸铝和氯化铁作混凝剂,通过强化混凝对模拟地下水中的氟化物的去除进行了研究,对比了铝铁盐的混凝沉淀除氟效果,考察了硫酸铝混凝剂投加量、水的pH值、浊度、水中共存离子和原水中氟化物初试质量浓度等因素对硫酸铝除氟效果的影响.结果表明,硫酸铝的除氟效果优于氯化铁,混凝剂的投加量和水的pH值是影响硫酸铝混凝沉淀除氟的重要因素,当水的pH≈5.8时,硫酸铝混凝除氟效果最好;高岭土增浊对硫酸铝除氟的效果影响不明显;水中共存离子HCO3-的引入使得除氟效果变差,而SO24-和Cl-的干扰则较小.此外,对硫酸铝混凝沉淀除氟的机理进行了初探.     

麦草制浆中段废水电凝聚气浮预处理研究

本文采用电凝聚气浮法对麦草制浆中段废水进行净化试验研究,考察了pH、水力停留时间、电流密度及极板间距对处理效果的影响。试验结果表明,当pH维持5～10,水力停留时间30min,电流密度0．3～0．4A／dm2,极板间距为10mm时,水质净化效果较好。     

电絮凝技术处理油田污水的影响因素实验研究

针对油田乳化液的水质特性,用电絮凝方法对配制的含油污水进行实验研究.首先分析极板间距、溶液初始pH值及NaCl含量对除油率的影响,确定实验参数.继而,实验研究电絮凝装置中竖直方向上典型的三层溶液,考察不同电流密度下除油率随时间的变化规律,比较三层除油率的特性曲线.发现A层去除效果最快最好,B层比C层处理效果差.在电解前4min,电流密度为150A/m~2时,A层除油率占其总效率的96.05%.从平均成本和三层除油率综合判定,电解16min,电流密度在100A/m~2时,电絮凝装置中整体处理效果最好.     

电絮凝法处理印染废水研究

用电絮凝法处理印染废水,考查了反应时间、极板电压、废水pH值和电极间距对印染废水CODcf去除率的影响．通过正交试验,确定了电絮凝法印染废水处理过程的优化条件为：反应时间40min,极板电压35V,废水pH值8,电极间距3cm,CODcr去除率可迭89．65％．     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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