超声吹脱处理氨氮废水工艺条件的试验研究

通过对高浓度氨氮废水的超声吹脱正交试验,确定了试验的最佳工艺条件:pH为11,吹脱时间为90 min,吹脱温度为40℃,超声波功率为80 W.在此最佳吹脱条件下,氨氮的去除率可以达到99%以上,吹脱后废水中的氨氮浓度小于100 mg/L.     

氨吹脱/投炭SBR处理垃圾渗滤液

以南京市某生活垃圾填埋场渗滤液为研究对象,采用氨吹脱/投炭SBR/混凝沉淀工艺处理小型生活垃圾填埋场渗滤液.试验中研究了氨吹脱单元中pH值、气液比对氨氮去除的影响,探讨了投炭SBR单元中粉末活性炭浓度对COD去除率,进水氨氮浓度对氨氮及COD去除率的影响.全流程试验结果表明:该工艺对COD、BOD5、氨氮的去除率分别为89.9%,94.0%,98.7%,出水水质达到了《生活垃圾填埋场污染控制标准》(GB 16889-1997)的Ⅱ级排放标准.两级氨吹脱与投炭SBR组合工艺处理低有机物浓度的小型生活垃圾填埋场渗滤液,在技术上是可行的.     

氨氮吹脱效率影响因素

为了研究不同因素对氨氮吹脱效率的影响程度以及最佳工艺运行参数,采用填料为排列规整的聚丙烯阶梯环的吹脱塔进行正交吹脱试验.试验结果表明,氨氮吹脱效率的影响因素顺序为：pH〉气液比〉水力负荷〉氨氮负荷;在水温为27-30℃、气温为25-27℃、进水氨氮负荷为24.46-80.38 kg/m2.m3,pH=11.0、气液比为3 300、水力负荷为2.25 m3/m2.h时,能得到较好的吹脱效果,出水氨氮浓度均低于20 mg/L,氨氮去除率均能达到98%以上.     

超声吹脱技术处理ADC发泡剂缩合废水中的氨氮

ADC发泡剂缩合废水属于高浓度氨氮废水,含有大量的生物难降解物质及生物毒性物质.采用吹脱法考察了pH值、温度、曝气量和曝气气体对氨氮去除率的影响,并在此基础上引入超声波技术处理废水,实验结果表明在pH为10,温度为30℃,超声功率为400W,曝气量1.0L.min-1条件下,超声吹脱处理180min后氨氮的去除率达到92%以上.     

吹脱法处理高浓度氨氮废水

运用吹脱法处理催化剂生产过程中产生的含(NH4)2SO4高浓度氨氮废水,考察了吹脱时间、废水pH、吹脱温度等因素对氨氮最大脱除率的影响.结果表明,当废水pH为11.5,吹脱温度为80℃,吹脱时间为120min,废水中氨氮脱除率可达99.2%.在此基础上探索了吹脱法脱除氨氮的工业装置操作的吹脱温度和气液比对废水氨氮脱除率的影响,适宜的操作工艺条件是:废水pH 11.5,吹脱温度为80℃,气液体积比300.     

SBR中好氧颗粒污泥的培养及特性研究

利用SBR反应器成功培养出好氧颗粒污泥,成熟颗粒污泥在进水pH值为7.22-8.82,温度20-30℃,COD为600-1500mg/L,氨氮不高于100mg/L情况下,对模拟生活污水有良好的处理效果,且C/N越高脱氮能力越强.将好氧颗粒污泥用于垃圾渗滤液生化出水深度处理中,能在6h内去除所有氨氮和亚硝氮,COD去除率可达30.30%,好氧颗粒污泥本身胞外多聚物明显增多,并出现直径4mm的绒球状颗粒污泥.     

曝气吹脱预处理渗滤液影响因素的中试研究

为保证垃圾渗滤液与城市污水合并处理时污水厂的生物处理工艺正常运行,采取预处理措施降低渗滤液的高氨氮浓度,以前期实验室小试为基础,针对曝气吹脱工艺,在重庆市涪陵区污水处理厂进行中试研究,考察pH、吹脱时间、气液比和温度对吹脱效率的影响,并通过经济分析确定各因素较佳的取值范围。研究结果表明:pH、吹脱时间、气液比和温度对曝气吹脱预处理垃圾渗滤液的吹脱效率影响显著;经综合考虑,取pH为10.25~11.75,曝气吹脱时间≤4 h,气液体积比为400~1 200,渗滤液水温为10~15℃。     

多面球填料塔的氨吹脱传质速率的影响因素

以钒冶炼厂高浓度氨氮废水为处理对象,设计由多面球填料吹脱塔、吸收塔(填科体积均为1 m3)和吹脱空气、废水、吸收液循环管道系统构成的氨吹脱系统,研究氨氮废水的循环流量、温度与pH,吸收液循环流量和pH以及吹脱空气循环流量等因素对氨氮吹脱速率的影响,得到不同条件下氨的总液相传质系数.研究结果表明:在最佳条件下,氨的总液相传质系数KL=7.2 mm/h.     

空气吹脱法在生活垃圾渗滤液氨氮脱除中的实验研究

采集生活垃圾填埋场渗滤液样品,用10%石灰乳和10%NaOH溶液调节pH值至8.0,9.0,10.0,11.0,12.0,13.0后,用鼓风空气吹脱法进行氨氮脱除实验。结果表明,在常温、曝气量为10L/min、曝气强度为30m3/(m2.h)条件下,将渗滤液的pH值提高至10.0~11.0后再进行吹脱,有利于氨从渗滤液中逸出,吹脱后pH值下降为9.0。当pH值为11.0,气液比为2000~2500,吹脱时间为150min时,渗滤液中的氨氮去除率大于90%。渗滤液中氨氮的去除与CODcr的去除无直接关系。     

吹脱法对垃圾渗滤液中的氨氮预处理研究

针对垃圾渗滤液中的氨氮对后续生物处理的严重抑制问题,利用渗滤液废水作为研究对象,采用吹脱法对氨氮进行前期去除。本研究主要通过实验研究生石灰施加量、吹脱时间和气液比对氨氮吹脱效率的影响,确定最佳生石灰投加量。结果表明,生石灰投加量在12.37g/L时,pH值达到11.5;并在吹脱过程中保持气液比为125倍和9h的吹脱时间作为最佳操作条件。     

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     

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