铁碳微电解处理废水中的镉/锌/铅

以电解锌厂生产废水为研究对象,用铸铁屑和活性炭的混合材料组成铁碳微电解反应器,考察了处理时间、pH值、溶解氧浓度、铁碳加入量对废水中镉、锌、铅3种重金属离子去除率的影响.结果表明,在进水pH值3~5、废水停留时间30min、溶解氧5mg/L、铁碳添加量为50g/L条件下,废水中镉、锌、铅3种重金属离子的去除率分别为96.5%,9 1.1%,72.6%.     

双氧水法处理FPC重金属废水的研究

化学法——即双氧水法处理柔性线路板(FPC)生产中所产生的含重金属离子的废水。以柔性线路板生产湿部的电镀废水为研究对象,考察了双氧水、聚合硫酸铁用量、pH值对废水中Cu~(2 )、Ni~(2 )等重金属离子的络合物破络效果及COD含量的影响。结果表明,双氧水用量2.5mL·L~(-1),聚合硫酸铁用量80mg·L~(-1),聚丙烯酰胺用量40mg·L~(-1),pH为6～9,效果好、操作简便、费用低廉。     

糖精生产废水的混凝-生化处理方法研究

运用化学混凝法和生化处理糖精废水，考察了无机高分子混凝剂聚合硫酸铁（PFS）的用量、pH值和羟乙基田菁胶等对混凝处理糖精废水的影响，并探讨了其作用机理。结果表明，在pH=3.7左右，PFS用量为930mg/L，羟乙基田菁胶为10mg/L，处理效果较好。用CaO MgO为中和剂和助凝剂可以加快沉降速度，缩小沉降比，并能有效控制体系的pH值和降低Cu^2＋浓度。经混凝－中和处理后的糖精废水，CODCr去除率达91.5%，脱色率达73.0%，Cu^2 去除率达100%，再经过生化处理可实现达标排放。     

不同混凝剂处理印染废水试验研究

选取了市售的聚合氯化铝铁（PAFC）、聚合硫酸铁（PFS）、聚合氯化铝（PAC）和自制聚合硫酸铁铝（PAFS）4种常用混凝剂对重庆某印染废水进行试验,探讨了混凝剂种类、废水pH值对印染废水脱色、COD去除效果的影响;考察了自制PAFS投加量、助凝剂投加量对印染废水的脱色、COD去除效果的影响;结果表明：4种混凝剂的混凝效果排序为：PAFS＞PAFC＞PFS＞PAC;在不调节原水pH的条件下,PAFS投机量为0.3 g/L时,印染废水的COD和色度分别达到最高为82.8％和86.6％;在此基础上再加入助凝剂的用量为4 mg/L时,印染废水的COD和色度最高分别达到95.8％和96.6％.     

混凝-氧化法对印染废水的降解、脱色研究

利用混凝法、氧化法对印染废水进行了以达标排放为目的的实验研究。结果表明,对色度为125倍、CODCr为804.4mg/L的印染废水,当絮凝剂用量为3.000g/L,次氯酸用量为10mL/L,在反应时间为1 min,pH为6的反应条件下,可使处理后水的色度达到2倍,CODCr降为118.5mg/L,能够达到国家二级排放标准。     

聚合硫酸铁净化厌氧发酵废水的研究

通过对用液体聚合硫酸铁处理城市生活垃圾厌氧发酵废水的,结果表明:最佳条件为聚铁投加量4.7～5.3 g/L、pH=5～9沉降时间2 h左右,经处理后COD去除率可达92.5%左右.     

芬顿-粉煤灰协同处理有机实验废水

利用芬顿试剂的强氧化性和改性粉煤灰良好的吸附性,协同处理有机实验废水.主要考察了过氧化氢、硫酸亚铁、改性剂用量及吸附条件对处理效果的影响.结果表明:当过氧化氢用量为25 g/L、硫酸亚铁用量为4.5 g/L、改性剂氧化钙浓度为30 g/L、吸附温度为35℃、pH值为5、振荡时间为35 min时,有机废水CODCr去除率可达90.5%.     

鸡蛋壳对酸性废水中的铅、铜、铬的吸附研究

研究了鸡蛋壳对废水中重金属铜、铅、铬去除效能,并初步探讨了鸡蛋壳煅烧温度、用量和pH值对去除效率的影响,并观察其在最佳条件下对金属的去除率.结果表明,用400 ℃下煅烧2 h,质量浓度为30 g/L的鸡蛋壳(pH值3.0),其除铜率能达到最佳值99.56%;用500 ℃下煅烧2 h,质量浓度25 g/L的鸡蛋壳(pH值...     

大孔树脂吸附法处理印染废水的研究

研究了大孔树脂吸附法处理直接红印染废水.考察了废水pH值、废水浓度、吸附时间和吸附剂用量对色度和浓度去除率的影响.结果表明:在pH值为8,废水浓度为9mg/L,反应时间为2小时,100ml废水中吸附剂用量为3g时,废水的色度去除率为93.9%,浓度去除率为97.9%.大孔树脂的重复使用性能良好.     

技改工程环境影响评价中的水污染防治措施案例分析

以天津市某电机公司技改工程环境影响评价为例,分析公司各生产工艺排放的废水中各种水污染物的成分以及它们的排放量与排放浓度,评价该公司内原有的生产废水处理站接纳拟建技改工程废水的能力与稳定达标排放的可行性,找出电镀车间污水处理设施排放口处一类污染物Ni超过GB 8978 -1996《污水综合排放标准》的原因,提出合理的污水处理方案,使公司生产废水处理站的排水实现稳定达标排放,由此阐述出环境影响评价对技改工程环境保护治理的技术指导的作用.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has