破胶絮凝-预氧化-深度氧化处理压裂返排液

以四川德阳某气田作业现场的压裂返排液为研究对象,通过对其水质特征、治理现状进行分析,提出了破胶絮凝-预氧化-深度氧化的处理工艺。通过实验研究,确定了性能优良的破胶絮凝剂、预氧化剂及Fenton氧化体系;并得出最佳实验条件:CaO、Al2(SO4)3及FeSO4的投加量均为5 000 mg/L;在不调节出水pH、加入预氧化剂高锰酸钾500 mg/L、反应时间15 min的条件下,CODCr去除率达到58%;调节废水pH至3.0~4.0,再采用Fenton氧化处理,其投加量为H2O2(30%)6 mL/L、及FeSO4·7H2O 5 000 mg/L,反应时长2 h。采用上述处理工艺,处理后废液的主要污染指标CODCr降低了79%,从而为达标处理创造了条件。     

Fenton试剂氧化法处理焦化废水SBR出水的研究

介绍了采用Fenton试剂氧化法对焦化废水经SBR处理后的出水进行了进一步处理,考察了试剂投加量、pH值及静置氧化时间对处理效果的影响。结果表明,当H2O2投加量为1.67mL/L,FeSO4·7H2O投加量为1.67g/L,pH为6.5,静置氧化时间为4h时,Fenton氧化达到最佳处理效果,CODCr从481.152mg/L降至246.758mg/L,去除率为48.72%。     

不同化学方法对印染、造纸废水的深度处理研究

采用Fenton试剂氧化法、NaClO氧化法、KAl(SO4)2混凝沉淀法分别对新乡市某印染厂和某造纸厂的二级生化出水进行深度处理.考察了废水初始pH,3种试剂投加量对废水COD和色度的影响.研究结果表明:室温下,反应时间30min,3种方法对印染废水、造纸废水的深度处理均具有明显效果.Fenton试剂氧化法对两种废水的处理效果明显优于另外两种方法,其对印染废水深度处理的最适条件为:pH 4,H2O20.8mg·L-1、FeSO4150mg·L-1,COD、色度去除率分别达到81.5%、75.0%,COD和色度分别从243mg·L-1、128降至45mg·L-1、32;其对造纸废水深度处理的最适条件为pH 4,H2O20.6mL·L-1、FeSO4200mg·L-1,COD、色度去除率分别达到73.8%、75.0%,COD和色度分别从351mg·L-1、128降至92mg·L-1、32.两种废水经过Fenton试剂氧化法处理后完全可以达到地方工业行业废水排放标准.     

Fenton试剂和UV-Fenton试剂深度处理垃圾渗滤液

研究了Fenton试剂和紫外光(UV)＿Fenton试剂联合深度处理垃圾渗滤液的最佳工艺条件,并对它们的处理效果进行比较,结果表明,最佳工艺条件是:H2O2量相当于COD耗氧值的1.5倍(即H2O2为0.96g/L)、pH值为3、FeSO4·7H2O的浓度为3.6×10-4mol/L(即100mg/L)、反应时间120min。在最佳工艺条件下,UV＿Fenton试剂联合处理渗滤液COD去除率达71.5%,比Fenton试剂单独处理时COD去除率提高了13%。     

Fenton化学氧化法深度处理造纸废水的试验研究

采用Fenton化学氧化法对造纸废水进行深度处理,考察了H2O2和Fe2+浓度、pH、反应时间等因素对COD去除率的影响。在H2O2(3%)投加量为13.33mL/L,FeSO4.7H2O投量为0.9g/L,pH为5,反应15min后静置5min的条件下,初始COD为290mg/L,色度为50倍的造纸生化出水的COD去除率可达到72%。结果表明,Fenton化学氧化法深度处理该废水可以取到很好的效果。     

镀铜铁屑--Fenton氧化反应的一种新催化剂

Fenton反应是一种高级液相氧化工艺,它利用H2O2分解产生的OH·自由基的高氧化反应活性,从水溶液中除去难处理有机物.传统的Fenton 氧化反应用FeSO4作为催化剂.作者研究发现,用镀铜铁屑作催化剂,形成Fe-Cu-H2O2体系,能强化H2O2对废水中的有机物的氧化降解能力,提高CODCr除去率及H2O2利用系数.对一种高CODCr的钻井污水相继进行两轮混凝处理,出水的CODCr值仍高达1 900 mg/L,后续微生物处理对该出水的降解效果差.使用Fe-Cu-H2O2体系氧化该出水,能将它的CODCr值降低至426 mg/L,所达到的H2O2利用系数为74 mg CODCr·cm-3H2O2,而使用FeSO4-H2O2的常规Fenton体系氧化时,滤液的CODCr=723 mg/L,H2O2利用系数为59 mg CODCr·cm-3H2O2.前者的H2O2利用系数比后者高出25%.试验结果表明,镀铜铁屑对Fenton氧化反应的催化活性优于硫酸亚铁,它是一种简单、有效的新Fenton反应催化剂.     

微波强化Fenton氧化法处理高浓度医药中间体废水

采用微波强化Fenton氧化法处理高浓度医药中间体废水,分别考察初始pH、双氧水(30%)投加量、FeSO4·7H2O投加量、微波功率和反应时间等因素对医药中间体废水处理效果的影响.结果表明:在初始pH为4、双氧水投加量为5mL/L、FeSO4·7H2O投加量为3g/L、微波功率为300W、反应7min的条件下,处理500mL医药中间体废水,其化学耗氧量(COD)去除率达89.7%.反应动力学研究表明,微波强化Fenton氧化法处理医药中间体废水符合一级反应动力学模型,反应半衰期为2.60min.     

Fenton试剂处理二硝基重氮酚工业废水的研究

二硝基重氮酚(简称DDNP)是一种性能优良的起爆药,但生产过程中产生大量的工业废水,一般工艺处理困难。Fenton法(Fe2+和H2O2组成的氧化体系)是对难降解有机物处理过程的一种高级氧化工艺。研究了Fenton试剂处理DDNP废水的工艺条件。实验结果表明:投加[PAC]=3g·L-1,[FeSO4]=0.5～0.8g·L-1,[30%H2O2]=5ml·L-1,pH=3.5;石灰为1g·L-1;在常温下可以使废水的CODcr去除90%以上,色度小于100。处理后的废水至少可以回用于冲洗设备、工具、地面等,以节约水资源。     

Fenton试剂处理印染废水最佳工艺条件研究

通过研究Fenton试剂处理印染废水的效果,确定最佳工艺条件。以1g/L的FeSO4和30%的H2O2处理印染废水,确定其最佳pH值,最佳H2O2和FeSO4投加量。结果表明,该法很适合作为成分复杂的印染废水的前处理,其最佳工艺条件是:最佳初始pH值为4;30%H2O2的最佳投入量是50mL/L;FeSO4的最佳投入量是20mg/L。最佳工艺条件下的CODcr及色度的去除率达到78.94%和98.50%,效果令人满意。     

UV-Fenton法预处理某制药厂废水的实验研究

制药废水是一种难生物降解的高浓度有机工业废水,处理困难.研究以某制药股份有限公司综合排放废水为对象,分别采用Fenton和UV-Fenton法对制药废水进行处理,分析试剂投加量、反应初始pH和反应时间等对反应的影响.结果表明,Fenton法处理制药废水的最佳条件为：FeSO4·7H2O投加0.036 mol/L,H2O2投加0.128 mol/L,初始pH为4.3,反应时间为2 h,CODCr去除率为43.9%. UV-Fenton法处理制药废水缩短反应时间,减少试剂投加量,最佳处理条件为：UV处理时间为7 min,FeSO4·7H2O投加0.029 mol/L,H2O2投加0.102 mol/L,初始pH为4.3,反应时间为75 min,最佳条件下CODCr去除率优于Fenton法,可达63.5%,且污水B/C增至0.39,提高可生化性.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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