沉积物粒度对重金属吸附的影响

本文报道了渭河沉积物对重金属的吸附特性.结果表明,渭河沉积物吸附重金属的粒度效应决定于不同粒度沉积物的物质构成和颗粒表面特性,该效应是由沉积物对重金属的吸附速率的差别来体现的.不同粒度所决定的颗粒比表面积的差异不是影响重金属吸附粒度效应的主要因素.     

克拉玛依油田百重七联合站污水处理自动控制方法研究

主要介绍了克拉玛依油田污水处理的一般工艺流程，阐述污水处理自动控制系统的硬件结构，并针对百重七联合站污水的特定工艺流程，详细论述了根据不同的调储罐液位和处理污水的总来液量给定不同的反应罐入口污水流量值的联锁控制算法。     

SDS改性沸石吸附结晶紫简

以表面活性剂十二烷基硫酸钠（SDS）对沸石进行改性，改性后的沸石对结晶紫溶液进行吸附，以紫外可见分光光度计分析最佳吸附条件。实验结果表明，在30℃，SDS改性沸石投入量为0.25 g；吸附平衡时间为1 h；pH为8的条件下，对含50 mg/L结晶紫染料的去除率可达到92.6%，吸附量达到4.63 mg/g。SDS改性沸石吸附结晶紫的等温吸附曲线与Henry型和Freundlich型均拟合较好。热力学参数计算结果表明，吸附符合自发吸热过程。     

Cadmium and mercury accumulation in European hare (Lepus europaeus): age-dependent relationships in renal and hepatic tissue

A total of 63 European hares have been collected from five Serbian agricultural regions. The hares assayed were divided into four age groups (3–6 months, 12 months, 12–24 months, and 24–36 months) and investigated upon presence at cadmium (Cd) and mercury (Hg) in the kidney and liver. The positive significant correlation (Ps—Pearson’s coefficient) between Cd concentrations in the kidney and liver within age group the 3–6 months was found (Ps?=?0.81, p?p?p?>?0.05). Statistically significant differences were registered between Hg content in the liver of the hares aged 24–36 and 12 months (p?p?>?0.05). The strong statistically significant associations were registered between Cd and Hg content in the liver (Cd L/Hg L) in the age group 3–6 and 12–24 months (Cd L/Hg L, Ps?=?0.94; p?Ps?=?0.91; p?相似文献   

探究性教学在大学语文课程中的运用——以讲授苏轼《水调歌头》一课为例

《大学语文》作为高职高专的一门公共基础课,因其丰富的人文内蕴、情感价值和审美趣味而承担了进一步提高大学生人文素质、增进文化修养的功能,从而培养大学生具有深厚人文精神的理想人格。在《大学语文》教学活动中开展探究性教学,既是教育改革全面实施素质教育的客观要求,也是大学生自我提升的内在需要。以讲授苏轼的《水调歌头·明月几时有》一课为例,阐述如何在高职高专《大学语文》课程的教学活动中引导和组织学生开展探究性教学。     

Seasonal variations in the relationship between landscape pattern and land surface temperature in Indianapolis, USA

This paper intended to examine the seasonal variations in the relationship between landscape pattern and land surface temperature based on a case study of Indianapolis, United States. The integration of remote sensing, GIS, and landscape ecology methods was used in this study. Four Terra's ASTER images were used to derive the landscape patterns and land surface temperatures (LST) in four seasons in the study area. The spatial and ecological characteristics of landscape patterns and LSTs were examined by the use of landscape metrics. The impact of each land use and land cover type on LST was analyzed based on the measurements of landscape metrics. The results show that the landscape and LST patterns in the winter were unique. The rest of three seasons apparently had more agreeable landscape and LST patterns. The spatial configuration of each LST zone conformed to that of each land use and land cover type with more than 50% of overlap in area for all seasons. This paper may provide useful information for urban planers and environmental managers for assessing and monitoring urban thermal environments as result of urbanization.     

雷电灾害对储罐影响的定量风险评估方法研究

基于定量化风险评估方法,研究雷电灾害对金属储罐的一种破坏方式———雷电流高温造成储罐的金属壳熔融破损,进而造成储罐失效事故。以某储罐区的装有石油的金属储罐为研究对象,对雷击储罐后,造成储罐破裂,引发池火这一事件链进行了分析,验证了该方法的可行性。     

A review of bioretention components and nutrient removal under different climates—future directions for tropics

Bioretention systems have been implemented as stormwater best management practices (BMPs) worldwide to treat non-point sources pollution. Due to insufficient research, the design guidelines for bioretention systems in tropical countries are modeled after those of temperate countries. However, climatic factors and stormwater runoff characteristics are the two key factors affecting the capacity of bioretention system. This paper reviews and compares the stormwater runoff characteristics, bioretention components, pollutant removal requirements, and applications of bioretention systems in temperate and tropical countries. Suggestions are given for bioretention components in the tropics, including elimination of mulch layer and submerged zone. More research is required to identify suitable additives for filter media, study tropical shrubs application while avoiding using grass and sedges, explore function of soil faunas, and adopt final discharged pollutants concentration (mg/L) on top of percentage removal (%) in bioretention design guidelines.

     

生物质材料预处理餐饮废水

采用4种廉价的生物质材料（水葫芦、柚子皮、木屑、核桃壳）用于餐饮废水的预处理。通过静态烧杯实验，研究了各生物质材料预处理废水的效果及最佳处理条件。结果表明，生物质材料对废水中COD的去除率均在45％以上，油脂吸附量为4～16mg／g，最优吸附材料为水葫芦，COD去除率达65％，油脂吸附量为16mg／g；水葫芦和柚子皮的最佳处理条件为：粒径〈0．2mm，投加量为20g／L，废水pH为4，处理时间为2h，温度为20℃；木屑和核桃壳的最佳实验条件为：粒径〈0．2mm，投加量为28g／L，pH为2，处理时间为2．5h，温度为20℃。生物质对餐饮废水的预处理，为废水中大量有机物和废弃油脂的去除提供了新思路和途径。     

Performance of the supported copper oxide catalysts for the catalytic incineration of aromatic hydrocarbons

A fixed bed reactor was used to assess the catalytic incineration of toluene by various transition-metal oxide species supported on gamma-Al(2)O(3). CuO/gamma-Al(2)O(3) was found to be the most active of seven catalysts investigated. The CuO species, with a Cu content of 5% (wt), was hence used with four different supports (CeO(2), gamma-Al(2)O(3), TiO(2) and V(2)O(5)) in order to define the optimal combination. Results of the catalytic incineration of toluene, X-ray diffraction (XRD) analysis, oxygen-temperature programmed desorption (O(2)-TPD), toluene-temperature programmed desorption (toluene-TPD) and hydrogen-temperature programmed reduction (H(2)-TPR) showed that CuO/CeO(2) was the most active catalyst, followed by CuO/gamma-Al(2)O(3). The activity of CuO/CeO(2) with respect to the VOC molecule was observed to follow this sequence: toluen>p-xylene>benzene. The addition of water vapor or CO(2) significantly inhibited the activity of the CuO/CeO(2) and CuO/gamma-Al(2)O(3) catalysts. The inhibiting effect of both was reversible for CuO/gamma-Al(2)O(3). For CuO/CeO(2), the inhibiting effect of CO(2) was reversible and even insignificant at a higher temperature (220 degrees C), but the effect of H(2)O vapor was somewhat irreversible at lower incineration temperatures (220 degrees C). For complete oxidation of toluene, the required reaction temperature increased with gas hourly space velocity (GHSV) and toluene inlet concentration.