上流式曝气生物滤池深度处理炼油厂外排污水   总被引：4，自引：0，他引：4  

崔康平  钟佐燊  沈照理 《地学前缘》2005,12(Z1):55-60

炼油厂外排污水水质复杂,可生化性已较差,但上流式曝气生物滤池对其有较好的处理效果.研究结果表明曝气生物滤池处理炼油厂外排污水在有机负荷(COD)为 4.39 kg·m-3·d-1、水力负荷为3 m3· m-2·h-1、气水比为31下,COD、NH3-N的去除率达到81.9%、73.2%;曝气生物滤池的主要影响因素依次是水力负荷、气水比、有机负荷;得到的经验速度方程与Monod方程基本吻合.该实验为炼油厂外排污水再生回用提供了一种工艺方法.  相似文献   

流速对D403型树脂从盐湖卤水中提取硼酸的影响研究          下载免费PDF全文

孔亚杰  李海民  韩丽娟 《盐湖研究》2006,14(1):46-48

针对流速对D403型苯乙烯系多羟基类弱碱性硼特效离子交换树脂从盐湖卤水中提取硼酸的影响进行了研究,讨论了这种树脂对硼的吸附量与卤水流速的关系。  相似文献   

Palaeolimnological Development of Lake Njargajavri, Northern Finnish Lapland, in a Changing Holocene Climate and Environment   总被引：1，自引：2，他引：1  

Kaarina Sarmaja-Korjonen  Marjut Nyman  Seija Kultti  Minna Väliranta 《Journal of Paleolimnology》2006,35(1):65-81

This study used palaeolimnological approaches to determine how Holocene climatic and environmental changes affected aquatic assemblages in a subarctic lake. Sediments of the small Lake Njargajavri, in northern Finnish Lapland above the present treeline, were studied using multi-proxy methods. The palaeolimnological development of the lake was assessed by analyses of chironomids, Cladocera and diatoms. The lake was formed in the early Holocene and was characterized by prominent erosion and leaching from poorly developed soils before the establishment of birch forests, resulting in a high pH and trophic state. The lake level started to lower as early as ca. 10,200 cal. BP. In the resulting shallow basin, rich in aquatic mosses, pH decreased and a diverse cladoceran and chironomid assemblage developed. It is likely that there was a slight rise in the water level ca. 8000 cal. BP. Later, during the mid-Holocene characterized by low effective moisture detected elsewhere in Fennoscandia, the lake probably completely dried out; this is manifest as a hiatus in the stratigraphy. The sediment record continues from ca. 5000 cal. BP onwards as the lake formed again due to increased effective moisture. The new lake was characterized by very low pH. The possible spread of pine to the catchment and the development of heath community may have contributed to the unusually steep (for northern Fennoscandia) decline in pH via change in soils, together with the natural decrease in leaching of base cations. Furthermore, the change in pH may have been driven by cooling climate, affecting the balance of dissolved inorganic carbon in the lake.  相似文献   

Linear pressurization method for determining hydraulic permeability and specific storage of a rock sample   总被引：1，自引：0，他引：1  

I. Song  J. Renner 《Geophysical Journal International》2006,164(3):685-696

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Geographic Perspectives of Air Transportation   总被引：1，自引：1，他引：1  

Timothy M. Vowles 《The Professional geographer》2006,58(1):12-19

Past, present, and future research directions and advances in this highly dynamic research area of air transportation are reviewed with an eye toward geographers' contributions to the air transportation industry. The study of air transportation within the field of transportation geography and the larger discipline of geography is important as geographers use air transportation to help describe concepts such as connectivity and linkages, development patterns at various scales, and the global economy. This article takes three approaches in exploring geographers' contributions to research in the field: historical, publication outlets, and topic focus. The goal of the article is to commemorate the contributions of pioneer and current researchers in the field, and open to discussion future research paths in air transportation.  相似文献   

Calculated and measured values of liquid water content in clean and polluted environments     

J. Fišák  D. Řezáčová  J. Mattanen 《Studia Geophysica et Geodaetica》2006,50(1):121-130

The relationship between liquid water content (LWC) and visibility (VIS) in a fog was examined by a field measurement of LWC values at a clean location of the meteorological observatory Sodankylä (Finland) and in a polluted region at the meteorological observatory Mile?ovka (Czech Republic). Furthermore, the use of a simple regression fog model to determine LWC from VIS is examined by comparing well-known relationships with the measurement results. The results show that the verbal characterization of environment (clean, mild polluted, polluted) is insufficient to calculate the LWC values from visibility. It is necessary to establish an additional criterion based on quantitative fog characteristics or to determine the site-related equation from the previous LWC and VIS measurement.  相似文献   

石家庄市污染日特征及其天气背景分析   总被引：8，自引：3，他引：8  

李国翠连志鸾  郭卫红陈静 《气象科技》2006,34(6):674-678

对石家庄市2002年1月到2004年12月空气质量达到中度及以上典型污染日进行了统计分析,得出典型污染日的分布特点、对应的气象要素特征及3种天气型。结果表明:典型污染日多出现在采暖季节,出现时间具有相对连续性;污染日分为沙尘和非沙尘两类,气象要素特征前者表现为风速大、湿度小、多正变压等锋后特征;后者则表现为地面风小、湿度高、多逆温层、大里查逊数等稳定大气层结,这些均为锋前特征;还侧重指出由于石家庄的特殊地形作用,高压前部型是石家庄重污染出现几率最多的天气类型。并由此提炼出中度以上污染日的预报要点,可供空气质量预报业务参考。  相似文献   

南岭山地高速公路路面温度变化特征分析   总被引：5，自引：1，他引：5  

吴晟 吴兑邓雪娇  谭浩波 《气象科技》2006,34(6):783-787

使用2003年3月至2005年8月南岭山地京珠高速公路粤境北段云岩路段3套自动气象站的逐分钟路面温度、地温、气温、湿度、风向、风速等气象资料,分析研究了南岭山地高速公路的路面温度特征及其与天气状况、气温、风速等气象条件的关系,并讨论了地形对南岭山地高速公路路面温度的影响。研究结果表明,南岭山地高速公路晴天和多云时的路面温度日变化明显,与辐射过程密切相关。路温与气温、地温的差异在晴天午后最为明显。晴天时路温、地温、气温的年变化趋势比较一致,路温与地温之间保持着明显的温差;多云天气时路温与地温的差值明显缩小,阴天时路温与地温的差值非常小。地形对路面温度有明显影响,高海拔地区路面温度相对较低,南岭北坡路面温度明显高于南坡,与局地小地形有关。高温过程时路面温度最高接近60℃,地温也超过50℃,持续高温对行车安全、路面和路基结构均有很大威胁。  相似文献   

以风场和湿度的显著季节变化确定全球季风的分布     

郑彬 《气象科学》2006,26(5):473-477

利用1958~2003年对流层相对湿度和风场(NCEP/NCAR再分析资料)的季节变化来定义盛行风的季节变化引起的天气气候明显变化的区域———季风区。通过分析表明,对流层低层的风场季节变率可以描述传统的季风区,但是在传统季风区以外,也有风场季节变率大的区域。利用中高层相对湿度的显著季节变化(热带地区季节变化大于20%,副热带地区大于10%,赤道地区以风向的季节变化大于90°)可以弥补风场季节变率的不足。由它们二者确定的季风区物理意义明确,有较大的合理性。  相似文献   

和田市能见度变化趋势及其与空气质量的关系     

玉苏甫·阿布都拉  热依汗古丽  买买提阿布都拉  米吉提·依明  Yusup·ABDULLA  Reyhanguli  Maimaitiabudula  Mijit·IMIN 《沙漠与绿洲气象(新疆气象)》2006,29(1):24-25,29

对1963～2004年和田市各级别大气能见度进行统计分析,揭示了大气能见度的年际变化和季节变化特征。近20a来和田市大气环境质量趋于好转,造成能见度恶化的重要原因是大气中悬浮颗粒的增多,因此大气能见度是评价大气环境质量的重要指标。  相似文献