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。     

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.     

Fenton降解活性黑5的褪色动力学研究

利用在线分光光度法对Fenton试剂降解活性黑5模拟废水进行褪色行为研究,考察了FeSO4初始浓度、H2O2初始浓度、pH值、反应温度等因素对活性黑5褪色过程的影响规律.结果表明,Fenton氧化过程分为两个拟一级动力学过程,反应前期褪色速率常数(k1)和反应后期褪色速率常数(k2)相差约5倍.增大Fe2+的初始浓度和体系温度能够增加k1和去除率,且k1与Fe2+初始浓度线性相关,反应活化能为3.451 kJ/mol;H2O2初始浓度和pH值存在最佳值,分别为2.118 mmol/L和3.     

UV/Fenton试剂处理阴离子表面活性剂废水性能研究

采用UV/Fenton试剂降解SDBS阴离子表面活性剂废水,在初始p H为3.0,Fe2+浓度为0.033 mol·L-1,H2O2分2次投加,总投加浓度为0.89 mol·L-1时,室温下紫外辐射反应30min,SDBS降解率可达89.01%.将UV、Fenton、UV/Fenton 3种体系处理SDBS废水的效果进行比较,发现UV对Fe2+催化H2O2氧化降解有机废水存在协同作用.     

Fenton试剂对含锰矿井废水处理实验

为了解决矿井水中锰去除难度较大的问题,使用Fenton试剂对含锰矿井水进行处理。考察了H2O2:Fe2+、反应温度、H2O2的投加量、pH、反应时间对Fenton试剂氧化除锰的影响,并讨论了Fenton试剂高级氧化除锰的机理。研究结果表明:Fenton试剂对含锰矿井水的处理效果很好,原水中Mn2+的初始浓度为2 mg/L,当H2O2:Fe2+摩尔比为3:1,反应温度为25°C,H2O2的投加量为8 mmol/L,pH值为5,反应时间为10 min的时候,Mn2+的去除效率可以达到84%。Fenton试剂生成的具有强氧化性的.OH能有效处理矿井水中的Mn2+。     

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.     

超声空化与Fenton试剂联合降解结晶紫染料废水

研究采用超声—Fenton试剂联合作用降解结晶紫染料模拟废水,将超声—Fenton试剂联合作用与两种方法单独作用对废水的处理效果进行了对比,考察了超声功率、初始pH、Fe2＋和H2O2投加量对结晶紫模拟废水的处理效果。结果表明,超声与Fenton试剂对结晶紫溶液的脱色有协同作用,降解率远远大于两种方法单独作用。增大超声功率有利于模拟结晶紫废水的降解。实验最适pH值为6.0。对于浓度为50mg/L的模拟结晶紫废水,最佳Fe2＋浓度为2.8mg/L、最佳H2O2浓度为4.5mg/L。     

芬顿氧化法修复敌百虫污染土壤的研究

采用高级氧化法修复敌百虫污染的土壤,考察了pH值、Fe2+、H2O2、敌百虫初始浓度等因素对土壤中敌百虫去除效率的影响。结果表明,芬顿高级氧化法能有效地降解土壤中的敌百虫,最佳条件为水土比2∶1,初始pH值3.0,H2O2/Fe2+的物质的量比25∶1。采用间歇式加入过氧化氢的操作方法,在污染土壤中加入Fenton试剂,敌百虫的降解率达到可达99.3%,并且其降解速率符合一级反应动力学规律。     

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.     

Fenton法去除垃圾渗滤液TOC的动力学研究

采用修正后一级反应动力学模型拟合Fenton法处理垃圾渗滤液结果,研究初始pH值、试剂比、H2 O2用量、初始浓度和温度等因素对动力学常数的影响并优化反应参数.结果表明：在考虑运行成本情况下,Fenton法处理渗滤液的最佳去除率为70.3%,此时反应条件初始pH值为3,[H2O2]/[TOC0]为4,[H2O2]/[Fe2+]为5,反应温度为室温.     

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.     

A computer generator for randomly layered structures

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

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.