电催化-生化法处理印染废水零排放工艺研究

以河北某印染企业的生产废水为研究对象，采用电催化-生化组合工艺探索了印染废水处理及回用技术。通过实验优化了电催化预处理工艺：槽电压3V，处理时长60min，有效电极工作面积与处理废水体积数值之比为1∶6时，废水的CODCr去除率达44.8%。以该工艺对印染废水预处理，可将BOD5与CODCr之比由0.27提高到0.48，使其生化性显著提高。再配合活性污泥（SBR）生化法进行深度降解后，出水水质可达循环冷却水水质要求，可直接作为循环冷却水回用，实现印染废水零排放。     

组合工艺处理印染废水研究

针对印染废水成分复杂、色度大、浓度高且生物难降解物质多等特点,本文作者采用了混凝沉淀法对印染废水进行预处理,而后以膜生物反应器与反渗透膜分离系统组合工艺处理,研究该工艺对印染废水COD及色度的去除特性.实验结果表明:采用混凝沉淀预处理,膜生物反应器与反渗透膜系统组合工艺处理印染废水具有很好的效果.当原水COD高达2 500 mg/L,色度高达10 000 倍,经该工艺处理后COD降到30 mg/L,NH3-N降到8 mg/L,色度为0,已经达到废水回用标准.     

含酚废水的太阳光/Fenton氧化预处理技术

研究了模拟含酚废水的太阳光/Fenton 氧化预处理技术.结果表明,含酚废水经过适当程度的太阳光/Fenton氧化预处理后,不仅可去除废水的部分COD,还可显著提高废水的混凝性能及可生化性.COD为710.4 mg/L的苯酚废水,直接进行混凝处理时,COD的去除率仅为14.3%,单纯采用太阳光/Fenton氧化处理(氧化剂H2O2的用量为150mg/L)时COD去除率为32%,而采用太阳光/Fenton氧化预处理— 混凝法联合工艺处理后,COD的去除率可达到62.1%,远大于单纯混凝与单纯太阳光/Fenton氧化处理效果之和.实验结果还表明适当程度的太阳光/Fenton 氧化预处理可明显提高苯酚废水的可生化性,使废水的 BOD5/CODCr比值由0.10提高到0.32.     

固定化微生物工艺处理印染废水

采用固定化微生物工艺,对混凝沉淀后退浆工序的印染废水进行了现场中试处理研究.试验结果表明,在水力停留时间(HRT)为20 h的条件下,对于进水化学需氧量(CODCr)为1.0-1.2 g/L的退浆废水,经过两级水解酸化、两级好氧处理后,其出水CODCr<100 mg/L,达到国家一级排放标准.其中,水解酸化阶段的HRT为10 h,CODCr负荷1.7 kg/(d·m3),去除率为44%;好氧阶段HRT为10 h,CODCr负荷1.9 kg/(d·m3),去除率为83%.在此基础上,建立了好氧反应器内大孔载体固定化微生物降解基质的动力学模型.     

物理化学法处理活塞环综合废水的试验研究

用隔油、破乳、混凝、沉淀4种物理化学处理方法,对活塞环金属加工、磨削、热处理、电镀清洗的混合废水处理进行试验研究．研究表明：活塞环综合废水经化学破乳一混凝沉淀处理后,CODCr的浓度可较大幅度地降低,平均去除率达62．1％,为后续生化处理创造条件．     

壳聚糖絮凝剂对焦化废水生化出水的COD去除研究

采用壳聚糖对经过A/O生物处理后的焦化废水进行深度处理,考察pH值和投药量对混凝作用的影响。焦化废水生化出水的CODCr为367 mg·L-1,浊度为44 NTU,色度为75。通过对不同pH值(4~10)的混凝实验可以看出,当pH值为6时相同投药量下焦化废水生化出水的色度、浊度以及CODCr去除率达到最佳。当絮凝剂的投药量达到10 mg·L-1时各项指标的去除率最高,其色度、浊度和CODCr去除率分别为66.67%、50%和68%。最终出水达到了国家排放标准。     

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。     

电镀中间体生产废水的预处理

电镀中间体废水呈强酸或强碱性,含盐量高,有机物浓度高且成分复杂,因此难处理.采用混凝-蒸发-臭氧双氧水协同氧化组合工艺对电镀中间体生产废水进行预处理研究,结果表明:混凝沉淀可去除部分CODCr并降低TDS,PAC+PAM混凝效果最佳;蒸发处理使各水样TDS均小于1 mg·L-1,CODCr在800～2000 mg·L-...     

微电解—UV/Fenton法组合预处理印染废水研究

以厦门某印染企业的生产废水为研究对象,采用微电解—UV/Fenton法进行了印染废水预处理的试验研究.通过正交实验得到了微电解反应的最佳条件:pH值为2,铁碳质量比为2,反应时间为90min,曝气量为32L/min.处理后色度去除率可达到90%以上,CODCr去除率在65%左右.向微电解反应的出水中投入双氧水进行UV/Fenton反应,双氧水(质量分数为30%)最佳投入量为20mL/L,处理后色度可降至10倍以内,CODCr可降至600mg/L左右.通过预处理的印染废水可生化性能得到大大提高,B/C由处理前的0.34提高到0.62.     

从蛇毒中提取神经生长因子的废水处理工艺研究

以提取蛇毒中神经生长因子过程中产生的废水为处理对象,经混凝-Fenton试剂催化氧化深度预处理后,改善了可生化性,CODCr降到2230 mg/L,BOD5/CODCr为0.26.随后结合加压SBR法进行生物处理,最佳组合工艺条件为:混凝处理的pH值为8,PAC浓度为150 mg/L;Fenton试剂催化氧化条件为:H2O2的用量为20 ml/L,pH值为4,反应时间为60 min;加压SBR法处理的停留时间为8 h,处理后出水CODCr小于100 mg/L,达到国家规定的一级排放标准.     

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