城镇污水处理过程中的通风除臭方法和设计

城镇污水在处理的过程产生的臭气,影响了操作人员健康和周边环境。通过对污泥脱水间以及粗细格栅进行通风和生物滤床联合工艺法处理排放的臭气,获得良好效果,并提供了有关的工艺设计参数。经某厂应用,硫化氢与氨气的去除效率分别为95.29%和88.68%。     

污水除臭技术的比较及探讨

本文介绍了污水恶臭污染的来源，臭气的基本成分和几种除臭方法，并通过比较，表明生物除臭法比较经济实用。     

浅谈城市污水处理厂除臭工艺

随着社会进步．经济发展、人们环境意识增强和生活质量的不断提高，污水处理厂恶臭气体控制与处理问题已越来越受到重视。本文就污水处理厂运行过程中产生的臭气，重点介绍了土壤脱臭化学反应除臭．生物／活性嶷脱臭和高能离子脱臭的作用原理、工艺流程及设计参数，并给出了具体的工程实例。     

浅析城市污水处理厂生物除臭法

本文介绍了在污水处理厂中应用的生物除臭3种方法：生物滤池法、洗涤式活性污泥法以及曝气式活性污泥法并结合案例进行分析，总结出活性污泥法是目前处理城市和工业污水普遍采用的好氧生化处理技术．其工艺流程较为简单，处理成本低,而处理效果好，BOD/COD去除率高。     

实验动物设施废气处理设备工艺选择

摘要:目的 废气处理设备工艺对环境的影响。 方法 通过对水喷淋吸收法、光氧化、低温等离子分解法和水喷淋加药法吸收分解的实验与分析,找出实验动物设施废气处理的设备最佳方案,通过检测进入和排出设备气体中氨、硫化氢、臭气浓度对比,筛选出最有效的除臭方法。 结果 通过测试表明,除臭喷淋水投加次氯酸钠或采用光氧化等离子除臭,排放的气体中氨、硫化氢、臭气浓度均优于《 恶臭污染物排放标准》 ( GB 14554—93) ,且经济可行。结论 采用喷淋水中投入次氯酸钠方法或采用光氧化等离子除臭与水喷淋除臭组合,均可满足动物设施排风除臭的需求,从经济和技术角度可行。 可减少实验动物设施排风中臭气的含量,有效地解决设施周边臭气的问题,高效、节能,可以在实验动物设施中推广应用。     

三次采油污水生化处理研究

实验采用生化法对三次采油污水进行处理。生化处理实验过程中应用了高效降解聚丙烯酰胺菌和烃类氧化菌,有效降低了三次采油污水的聚合物含量、含油量、悬浮物和COD等污染控制指标,处理后的污水达到了油田回注水处理要求和国家污水综合排放标准中的一级排放标准。     

生物除臭技术在南方某污水处理厂的应用研究

南方某污水处理厂位于该市中心,污水处理厂的臭气问题严重影响周边居民的日常生活.为治理恶臭气体污染,本文根据老污水处理厂的具体情况,将格栅、沉砂池等处的臭气集中起来,采用生物滤池法进行处理,达到了较理想的技术、经济目标.     

油田高温采出水生化处理研究

针对胜利油田乐安油田56～60℃高温含油采出水,筛选出高效降解石油污染物的高温功能菌,采用生物接触氧化工艺实现该油田采出水生化处理,处理后污水达到国家污水综合排放标准中的一级排放标准。     

SBR工艺处理腈纶混合废水试验研究

本文研究了SBR法处理腈纶混合废水工艺条件,考察了腈纶混合废水先经超声波处理,再经SBR处理的效果。试验结果表明:COD去除率为73.3%,BOD去除率为46.4%。采用超声波对腈纶混合废水作预处理,可有效降低腈纶混合废水的COD,NH+4-N,增加腈纶混合废水的可生化性。再经间歇式活性污泥法(SBR)处理后,各项水质指标均符合GB8978-88《污水综合排放标准》中的一级标准。     

辽化第四污水处理场生化工艺设计分析

通过对辽化二期第四污水处理场工艺路线确定、生化处理系统主要设计内容及特点、 设计上存在问题与解决措施以及运行效果等方面进行阐述和分析，充分论证了普通适性污泥法作为第四污水处理场生化处理工艺的合理性与实用性。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

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