UV/Fenton试剂处理高浓度含酚废水的实验研究

研究UV/Fenton试剂中各个因素对降解高浓度含酚废水的影响,确定UV/Fenton法处理高浓度含酚废水的最佳工艺条件.保持UV/Fenton体系的基准条件不变,通过改变pH值、H2O2浓度、Fe2+浓度、反应时间等实验条件,考察这些因素对UV/Fenton法处理高浓度含酚废水效果的影响.结果表明,UV/Fenton试剂对高浓度舍酚废水有较好的去除效果和较高的反应速率.当苯酚初始浓度为1 000 mg/L时,紫外光波长为253.7 nm,反应时间为25～40 min,pH值为6～7,H2O2浓度为40～50 mmol/L,Fe2+浓度为28～30 mg/L时,苯酚去除率可迭90%以上,满足后续生物降解要求.     

空化水射流-双氧水处理苯酚废水的机理分析

用双氧水联合空化水射流氧化法,以苯酚模拟废水为研究对象,考察多种因素对苯酚去除率的影响,并通过高效液相色谱分析反应中间产物,揭示其降解机理.实验结果表明,当苯酚初始质量浓度为100 mg/L,溶液pH值为3.0,双氧水质量浓度为300 mg/L,泵压及围压分别是20、0.5 MPa时,苯酚的去除率达到了99.85%.高效液相色谱分析表明,苯酚降解的中间产物主要是对苯二酚、邻苯二酚、苯醌及其他有机小分子物质,最终产物为顺丁烯二酸、乙酸.     

photo-Fenton试剂法降解硝基苯废水

应用photo-Fenton过氧化过程研究对硝基苯水溶液的降解.测定反应物质量质量浓度、温度和pH对硝基苯降解的影响.使photo-Fenton法更加有效的降解水溶液中的硝基苯.在pH等于3、初始质量质量浓度H2O2为200 mg/L、Fe2+为30 mg/ L条件下仅在30min内应用photo-Fenton 法可将硝基苯降解50 %左右(硝基苯初始质量浓度为200 mg/ L)完全降解.     

三维电极-电Fenton耦合法降解硝基苯废水

采用三维电极-电Fenton耦合法处理硝基苯废水,考察了废水中有机物降解的影响因素及废水处理效果,并与三维电极法、普通电Fenton法去除硝基苯的效果进行了对比.结果表明:随电解时间的延长和初始pH值、极板间距、槽电压、Fe2+投加量、曝气量的增加,硝基苯废水中的化学需氧量(COD)和硝基苯的去除率均呈先增后降或趋于平缓的态势;最佳试验参数为电解时间2.0h、初始pH值为3.0、极板间距6 cm、槽电压30 V、Fe2+投加量1.0g/L、曝气量0.8m3/h;在此条件下,COD及硝基苯的去除率分别为93.1%和96.5%.文中还通过对中间产物进行气相色谱/质谱联用分析,探讨了硝基苯的降解机理,并进一步证明了三维电极-电Fenton耦合法较三维电极法、普通电Fenton法具有更好的硝基苯类物质去除效果.     

硝基苯类制药废水催化氧化降解的研究

采用超声波/Fenton试剂降解硝基苯类制药废水,研究了有关的工艺条件和硝基苯降解率的关系,并对其降解动力学规律进行了初步探讨。结果表明,降解反应的最佳工艺条件为：在常温常压下,反应时间为40 min,pH值为3,H2O2浓度和Fe2＋浓度分别为200 mmol和20 mmol/L,超声功率为400 W,硝基苯降解效率可达94%。超声/Fenton对废水的处理符合一级动力学规律,超声/Fenton缩短了反应时间,提高了降解效率,体现了协同作用的优点。     

气液流化床内氧化法处理含酚废水

研究在流化床内使用Fenton试剂氧化处理模拟含酚废水,探讨H2O2和Fe2+的初始浓度、H2O2与Fe2+的摩尔比(n(H2O2)/n(Fe2+))、pH、反应温度、反应时间和通气量等因素对苯酚去除率的影响.确定最佳处理条件为:c(H2O2)=12 mmol/L,n(H2O2)/n(Fe2+)=4:1,pH=4,温度为60℃,反应时间为30 min,通气量为0.12 m3/h,在此最佳实验条件下苯酚的去除率可达96％,此时的苯酚质量浓度为100mg/L.     

铁络合羧基碳纳米管非均相Fenton降解对硝基酚

针对Fenton氧化体系中酚类化合物降解中间产物易于与铁离子络合导致催化剂失活的问题,提出了将活性组分以羧基络合的方式合成非均相Fenton催化剂的方法.利用FTIR、XRD和XPS技术对铁络合羧基碳纳米管的结构和组成进行了表征,并通过真空抽滤的方式将铁络合羧基碳纳米管沉积在聚四氟乙烯滤膜上,用于非均相Fenton降解对硝基酚的过程和还原再生性能研究.结果表明:当铁络合羧基碳纳米管膜沉积量为30 mg、溶液初始pH值为5.0时,30 mg·L~(-1 )H_2O_2溶液流经膜层后的转化率随反应时间的延长而逐渐下降,2,30 min时H_2O_2的转化率分别为90.23%,19.54%;通过自由基捕获试验证实体系中主要氧化基团为羟基自由基,初始质量浓度为10 mg·L~(-1)的对硝基酚在该非均相Fenton体系中的降解非常迅速,2 min对硝基酚的去除率接近100%,TOC去除率可达80%;铁络合羧基碳纳米管膜层的催化活性可在阴极电位-1.0 V vs. Ag/AgCl下电还原再生,体系TOC去除率仍可达80%左右.     

Fe 改性活性炭对水中对硝基苯酚的吸附性能研究

通过Fe改性活性炭制得Fe2O3-AC吸附剂,用于对硝基苯酚废水处理,探讨吸附温度、吸附时间、吸附剂用量、初始质量浓度等因素对Fe2O3-AC吸附性能的影响.结果表明:吸附温度为25℃、吸附时间为90min、吸附剂Fe2O3-AC用量为60mg、对硝基苯酚溶液体积及初始质量浓度分别为50mL,100mg/L时,废水中酚去除率可达98.55%.     

Fenton氧化法降解洛美沙星的研究

针对水体中普遍存在的喹诺酮类抗生素,选择洛美沙星(Lomefloxacin,LOM)作为研究对象,采用Fenton氧化法对其进行降解,并深入研究了以下4个因素:Fe2+初始浓度、H2O2初始浓度、初始pH值、LOM初始浓度对降解行为的影响。通过单因素实验并综合考虑成本效益筛选出最适宜的反应条件,即选取pH=6.5,Fe2+初始浓度、H2O2初始浓度分别为0.1 mmol/L,0.5 mmol/L,处理初始浓度为50μmol/L的LOM水溶液,反应5 min后LOM的去除率达到89%。umu试验结果显示在Fenton氧化降解LOM过程中,体系的遗传毒性在反应初期迅速降低,之后降低速度减缓,同时体系的抗菌活性也随着反应进行逐渐降低。     

内电解-芬顿氧化-絮凝组合工艺处理硝基苯废水

硝基苯作为一种典型硝基芳香族化合物（NACs）,其对人类健康和生态环境具有极大的危害,因此探究硝基苯的高效降解方法具有重要意义。采用内电解-芬顿氧化-絮凝组合工艺处理硝基苯废水,探究镀铜率、反应时间、曝气量、pH及n(H2O2)/n(Fe2+)等参数对该组合工艺处理废水效果的影响,完成相关工艺参数条件优化,并揭示相关耦合机理。实验结果表明：在镀铜率为0.5%、曝气量为0.5 L/h、反应时间为6 h的条件下,初始质量浓度为50 mg/L的硝基苯可被铁铜内电解转化成苯胺,转化率为99.8% (±0.2%);芬顿氧化反应在n(H2O2)∶n(Fe2+)=10∶1、pH=3.0、ρ(Fe2+) = 60 mg/L的条件下,苯胺的去除率达到99.8% (± 0.3%);絮凝沉淀反应中阴离子PAM的絮凝效果更好,当加入2 mL质量浓度为10 mg/L的阴离子PAM时,废水的色度为20倍,达到了国家规定的一级排放标准。综上所述,该组合工艺在处理含硝基苯废水中具有较好的可行性,可为实现大规模化处理含高浓度NACs废水奠定基础。     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.