超声-Fenton法处理甲硝唑制药废水的研究

实验采用超声-Fenton法处理甲硝唑废水.通过测定COD值的变化得到处理的效果,通过静态实验研究Fe~(2+)投加量、H_2O_2投加量、pH值和超声反应时间对COD去除率的影响.正交实验结果表明,各因素影响显著性的先后顺序为H_2O_2投加量Fe~(2+)投加量pH值超声反应时间.研究结果表明,对于COD为1 010.5 mg/L的甲硝唑制药废水,在Fe~(2+)的投加量为0.06 mol/L,H_2O_2投加量0.25 mol/L,pH值为3,超声时间为60 min的条件下,COD去除率可达到95%,处理后COD质量浓度为50.5 mg/L,达到国家一级排放标准.说明超声-Fenton法对甲硝唑制药废水有良好的处理效果.     

Fenton法处理DMF废水及无机阴离子对反应的影响

N,N-二甲基甲酰胺(DMF)作为一种万能溶剂在工业中被广泛应用,但它有毒性、难以生物降解。本文采用Fenton法处理DMF模拟废水,考察了pH、反应时间、氧化剂投加量等条件对处理效果的影响,同时探讨了Cl-和SO2-4对反应的影响。研究结果表明:处理1g/L的DMF模拟废水,最佳反应条件为:w=30%H_2O_2的投加量为40mL/L,pH=2.0,n(H_2O_2)∶n(Fe2+)=3∶1,反应时间2.5h,在该条件下出水化学需氧量(COD)小于100 mg/L;Cl-对Fenton法处理DMF废水有着十分强的抑制作用,1g/L就会使出水COD由90mg/L上升到250mg/L;而SO2-4对Fenton反应的处理效果影响很小,当ρSO2-410g/L时有一定的促进作用。     

超声波-Fenton氧化法处理米诺环素制药废水研究

米诺环素制药废水难以被常规的生物法氧化降解,用超声波-Fenton组合高级氧化法对其进行处理,进行了单因素和正交实验.以COD值变化为测定指标,在超声波28 k Hz频率、15 min反应时间下,研究了H_2O_2的投加量、超声波功率、Fe~(2+)/H_2O_2物质的量的比和反应初始值pH对处理米诺环素废水效果的影响.结果表明,当H_2O_2的投加量为8 m L/L,超声波功率为300 W,Fe~(2+)∶H_2O_2物质的量的比为1∶20,反应初始pH值为3.0的条件下,COD的去除率达到最大,为86.15%.说明超声波-Fenton氧化法对于这种四环素类难降解抗生素制药废水的降解效果很好.     

非均相UV/Fe-Cu-Y/H_2O_2体系处理含酚废水的试验

目的研究非均相UV/Fe-Cu-Y/H_2O_2体系对废水中酚的去除效果,确定该体系处理含酚废水的工艺条件.方法蒸馏水加入分析纯的苯酚晶体配制成水样,通过单因素试验分析各反应条件对废水中COD和苯酚去除率的影响,以确定最佳反应条件.结果非均相UV/Fe-Cu-Y/H_2O_2体系处理苯酚废水,H_2O_2(3%)的投加量为1.0 mL/L,催化剂的投加量为0.8g/L,调节pH值为5,最终苯酚的去除率为95%,COD的去除率为90.25%.结论非均相UV/Fe-Cu-Y/H_2O_2体系的氧化效果很大程度上受H_2O_2和催化剂投加量的影响,加入铜离子可以提高去除率.     

微波辅助类Fenton体系处理印染废水的试验

目的研究微波辅助类Fenton体系降解活性艳红X-3B染料废水的处理效果及p H值、催化剂投加量、H_2O_2投加量、微波辐照时间、功率等因素对废水色度和COD去除率的影响.方法制备催化剂,在微波辅助的条件下,控制pH值、H_2O_2投加量、微波功率及辐照时间、催化剂投加量,比对活性艳红X-3B的处理效果.结果初始色度为1 897倍的活性艳红X-3B废水,在催化剂投加质量浓度为10 g/L、初始pH值为3、H_2O_2投加浓度为17.5 mmol/L、微波功率为400 W,辐照时间为8 min的最优条件下,色度去除率最高可以达到99.08%,COD最大去除率达到89.12%.结论微波辅助类Fenton体系能有效处理活性艳红X-3B废水,提高废水的色度去除率和COD去除率,且该类Fenton体系投药量低,适用的pH范围也更广.     

混凝法联合Fenton或O3氧化法深度处理焦化废水生化尾水

采用混凝法分别联合芬顿(Fenton)和O_3氧化法深度处理焦化废水的生化尾水。通过单因素实验分析,分别研究聚合硫酸铝铁(PAFC)、H_2O_2以及O_3的投加量对化学耗氧量(COD)、总氮(TN)以及苯酚处理效果的影响,并通过紫外-可见光吸收光谱(UV-Vis)分析废水中有机污染物的降解机制。结果表明:当PAFC投加量为2 000 mg/L时,混凝法对COD、TN以及苯酚的去除率分别为10.19%、2.36%以及2.13%;当H_2O_2投加量为0.07%时,Fenton强化混凝法对COD、TN以及苯酚的去除率分别为81.08%、22.49%以及95.84%;当O_3投加量为1 000 mg/L时,O_3强化混凝法对COD、TN以及苯酚的去除率分别达到82.63%、30.29%以及100%,对废水起到了良好的净化效果。     

Fenton氧化处理杨木活性染料染色废水工艺研究

为解决杨木活性染料染色废水达标排放的问题,采用Fenton法对杨木活性染料染色废水进行氧化处理。通过正交实验考察了30%H_2O_2投加量、FeSO_4·7H_2O浓度、反应温度、反应时间以及初始pH值对废水COD和色度去除率的影响。结果表明:Fenton氧化处理方法对该废水处理效果显著,优化工艺条件为30%H_2O_2投加量7.5 ml/L、FeSO_4·7H_2O浓度0.9 g/L、pH值2.5、反应温度50℃、反应时间80 min,处理后废水的COD和色度去除率分别达到92.27%和99.99%。Fenton法处理染色废水时对反应初始pH值要求较高,但具有处理时间短、污染物去除率高等优点。     

芬顿氧化法对抗生素废水深度处理的实验研究

研究了芬顿氧化法对抗生素废水SBR出水的深度处理效果,考察了pH值、H_2O_2投加量、FeSO_4·7H_2O投加量及H_2O_2和Fe SO_4·7H_2O的投加比对废水中COD去除率的影响。结果表明:在pH值为3.0、0.6 g FeSO_4·7H_2O、1.4 mL H_2O_2,反应时间为3h、室温条件下,芬顿氧化法对抗生素废水SBR出水的COD去除率达77.8%,为今后难处理有机废水的深度处理提供了新思路。     

钽铌矿冶炼铁泥制备聚硅酸硫酸铁及其应用

以Fenton法处理钽铌冶炼废水产生的铁泥为原料,制备了聚硅酸硫酸铁(PFSS)絮凝剂.研究了PFSS的制备工艺条件、PFSS投加量、废水的 pH值和搅拌时间对PFSS絮凝性能的影响.结果表明,当制备工艺条件中的SiO2质量分数w(SiO2)为1.00%,A,B混合液pH值为3.00,n(Fe)∶n(Si)为1∶1,活化温度为40 ℃,活化时间为2 h时,得到的PFSS具有最好的絮凝性能.用PFSS絮凝剂处理钨铋选矿废水,PFSS投加量为废水体积分数0.10%,废水pH值为7.00,搅拌2 min后,废水浊度去除率达99.9%,COD去除率达77.8%;废水中Pb和As去除率分别达99.0%和97.4%,Be去除率几乎达100%.处理后废水浊度为0.32 NTU,COD含量降至72.2 mg/L,废水中Pb和As质量浓度分别降至0.08和0.03 mg/L,Be未检出.处理后废水达到GB 8979-1996一级排放标准.     

Fenton试剂和活性炭复配对印染废水的深度处理研究

以印染废水为对象进行Fenton与活性炭颗粒复配深度处理试验,考察活性炭颗粒、pH值、FeSO_4·7H_2O和H_2O_2投加量及反应时间对Fenton体系氧化性能的影响.结果表明:活性炭颗粒投加量为25g·L~(-1),pH=4.0,FeSO_4·7H_2O投加量为0.6g·L~(-1),H_2O_2的投加量为3mL·L~(-1),反应30min后色度的去除率达88.1%,COD_(Cr)去除率达67.4%,其浓度可降至50mg/L以下.因此,认为Fenton试剂与活性炭的复配可实现对印染废水的深度处理.     

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

正~~     

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