絮凝预处理养牛场废水研究

通过对CODC r(化学需氧量,Chem ical Oxygen Dem and)、絮凝固相物、色度及透光率等指标的分析,研究了Fe3 和A l3 对养牛场废水的絮凝预处理效果。结果显示:Fe3 、A l3 絮凝处理能有效降低污水中的有机负荷,实现固液分离。随着絮凝剂浓度的增大,水中CODC r和色度均逐步降低,絮凝固相物质量逐步升高。当Fe3 和A l3 浓度为11.25 mmol.L-1时,CODC r去除率分别达到89.13%和82.61%;A l3 作为絮凝剂时,色度(稀释倍数)从1000降低到75,透光率从2.5%增加到73.8%。;当Fe3 和A l3 浓度从2.50 mmol.L-1增加到11.25 mmol.L-1时,絮凝固相物质量分别增加到原来的2.66倍和2.86倍。实验证明:Fe3 、A l3 絮凝预处理养牛场废水效果显著,将其用于养牛场废水的预处理,可缩短处理周期、缩小构筑物容积、减少占地面积,从而降低处理成本,为实现养牛场废水以及类似水质废水的快速处理提供理论依据。     

Fenton试剂预处理聚酯树脂废水的研究

运用Fenton试剂处理工业废水（起始CODC r=60220 mg/L）,通过改变H2O2投加量、Fe2＋投加量及废水初始pH值等参数,对某聚酯树脂废水进行Fenton试剂氧化正交试验。并在正交试验的基础上进行单因素试验,确定Fenton氧化的最优工艺参数。试验结果表明,在正交试验因素所选的水平中,三个影响因素的大小顺序为：H2O2投加量〉废水初始pH值〉Fe2＋投加量。在室温条件下,H2O2/CODC r=2（质量比）,[Fe2＋]/[H2O2]=1/10（质量比）,pH=2.9,反应2h后,废水的CODC r去除率可达74.23%。废水的BOD5/COD值由起使0.352提高至0.582（预处理后）,可生化性得到较大提高,有利于后续的生化处理。     

微电解-Fenton氧化法预处理Fischer-Tropsch合成废水试验研究

用微电解-Fenton试剂催化氧化组合工艺对Fischer-Tropsch合成废水进行预处理,研究探讨该处理过程中各种反应条件和工艺参数对处理效果的影响.结果表明:在微电解铁炭体积比1:1 ,进水pH为3.0,反应时间120 min的条件下,对F-T合成废水中CODCr的去除率达到39.2%;微电解后出水经Fenton试剂进一步氧化,在pH为3,H2O2的投加量为 30 mL/L,反应时间为 90 min时,其CODCr的去除率可达69.4%.ρ(BOD5)/ρ(CODCr)可从0.06提高到0.32,有效地提高了废水的可生化性.     

铁炭微电解-Fenton试剂法处理含硝基苯废水的研究

采用微电解-Fenton试剂法对吉林市某双苯厂含硝基苯等化工废水预处理进行了试验,摸索和探讨了预处理反应条件、影响因素,建立了最佳工艺路线和工艺条件.并在最佳条件下进行了连续中试放大试验.现场中试试验结果表明,废水的CODcr去除率为87%左右.BOD5/CODcr值由原来的0.3以下上升到0.5左右,提高了废水的生化性能.通过气相色谱对处理前后废水中硝基苯等有机物含量进行了比较,说明硝基苯等物质基本被去除.同时对废水处理药剂费用进行了分析,处理每立方米废水的药剂费用不高于5元.     

碳纳米管修饰石墨电极处理硝基苯废水

对石墨电极预处理,然后运用多壁碳纳米管对其进行修饰。利用该修饰电极对硝基苯模拟废水及实际硝基苯废水进行电解,与未修饰的预处理石墨电极的处理效果进行对比。对苯酚模拟废水和实际水样分别进行交流电电解。多壁碳纳米管修饰的石墨电极对硝基苯模拟废水中硝基苯浓度的处理效率由80.4%提高到96.8%,COD去除率由79.8%提高到96.4%;对实际废水的硝基苯浓度去除率由74.2%提高到87.6%,COD去除率由86.9%提高到93.2%,处理效果明显提高。     

用Fe2+/O3对垃圾填埋场后期渗滤液的预处理

用自制微孔扩散式接触反应器对Fe2 催化臭氧化预处理垃圾填埋场后期渗滤液进行了实验分析.结果表明,添加一定量的Fe2 ,对臭氧氧化渗滤液中的化学需氧量(CODC r)具有明显的催化作用.当臭氧流量为8.89 mg/m in、Fe2 添加量为10 mg/L,经90 m in处理后,模拟废水的生化需氧量/化学需氧量(BOD5/CODC r)可由初始的0.17提高至0.35,改善了废水的可生化性;同时,渗滤液的色度、浊度、腐殖酸和悬浮物(SS)也有较高的去除率.     

福州市某酚醛树脂生产废水预处理研究

采集福州市某化工厂酚醛树脂生产废水,用微电解-Fenton试剂氧化-混凝沉淀工艺预处理,考察各影响因素对预处理效果的影响,并确定了工艺优化条件。结果表明:在进水CODcr浓度为56920 mg/L,pH为2.30,挥发酚浓度为1279 mg/L,甲醛浓度为12951 mg/L的条件下,Fe/C质量比4∶1,微电解反应时间1 h,H2O2投加量4 g/L,Fenton试剂氧化反应时间为1 h,混凝剂PAM的投加量为800 mg/L,pH为8.5的条件下,废水的CODcr总去除率为89.6%,挥发酚去除率为84.3%,甲醛去除率为98.5%,经过预处理后,酚醛树脂废水达到生化处理的要求。     

微电解-Fenton法预处理制革废水

采用静态实验,考察微电解-Fenton法预处理制革废水中各种工艺参数对处理效果的影响.确定最优条件:微电解进水pH值为3,反应时间为1 h,Fe和C的体积比为1∶1,铁屑的投加量为200 g;Fenton反应的H2O2的投加量为3 mL,反应时间为50 min.在此条件下,制革废水经微电解-Fenton法预处理,化学需氧量去除率能达到80%左右,出水水质得到较大改善,为后继生物处理提供必要的条件.     

微电解-芬顿法预处理吡虫啉农药生产废水

吡虫啉农药生产废水是一种典型的高浓度难降解有机废水,可生化性差,需采用物化法进行预处理.采用微电解芬顿法作为吡虫啉农药生产废水的主要预处理工艺,有效地降低了废水中有机物浓度,提高了废水预处理出水的可生化性.实验结果表明,微电解最佳条件:pH 3~4,停留时间90min;芬顿法的最佳条件:微电解出水调pH 4~5,控制停留时间1h,30% H2O2按140mg/L的比例投加.最终预处理出水的COD去除率为81%,色度的去除率达90%,BOD5/COD提高到0.25以上,废水可生化性大大提高.     

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.     

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).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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.