改性湿熄焦焦粉联合臭氧法处理污水的研究

本文的主题是探索用活化后的湿熄焦焦粉联合臭氧对生活污水进行处理,主要研究熄焦粉对生活污水的处理效果、熄焦粉活性炭的制备、熄焦粉活性炭对污水的处理效果以及用熄焦粉活性炭联合臭氧处理生活污水的方法。     

美国十大臭氧处理水厂概况(下)

<正> 6.T.L.阿米斯(T.L.Amiss)水厂 这是路易斯安那州红河(Red River)沿岸的发达都市什里夫波特(Shreveport)市的水厂,以克罗斯(Cross)湖水为原水。该厂于1988年开始实施臭氧处理,有供水人口20万。10多年前,湖水中发生异臭味,因而乘机引进臭氧处理技术。     

晴空下的臭氧污染

臭氧并非一种直接污染物,而是氧气、氮氧化物等在阳光作用下发生光化学反应形成的二次污染。城市中最主要的臭氧污染源是汽车尾气。臭氧对人体的危害主要作用于呼吸道,污染高发期一般在夏季,尤其是下午1点至5点交通高峰与高温的叠加。晴澈,臭氧却不知不觉超标热高温的长夏季节,天空湛蓝如洗,北京、上海、南京、天津、宁波等地却爆出不同程度的臭氧超标报道,空气     

臭氧-气浮联用新工艺处理含藻水

介绍臭氧—气浮法在除藻中的联合应用、其除藻工艺和主要优点。     

臭氧处理在日本净水中的动向

在日本,臭氧用于水的深度处理,以去除异臭味、色度及THM前体。     

饮用水预氧化技术工艺进展和功效评价

该文对当前预氧化工艺的研究热点和成果进行了总结,认为:对于预氯化,在合理控制加氯量和反应时间的前提下,可以取得较好的投加效果;高锰酸钾和臭氧复合预氧化技术,由于其在去除消毒副产物前体和AOC物质上的优越性,有很好的应用前景;对预氧化的功效进行评价应根据预氧化工艺对后续工艺的影响,综合考虑出水的浊度、有机物、消毒副产物前体等指标予以评定。     

浅析臭氧在饮用纯净水生产中的功效

臭氧在低浓度时具有特殊的草腥味,高浓度时呈淡蓝色,具有一种特殊的刺激性味道.臭氧O3为氧的同素异构体,也是一种非常活跃的分子,在常温侣18℃～30℃是时,即迅速分解为氧分子(O2)和氧原子(O).     

我国首次“实时公开发布”七大水系水质

7月1日中午12:30,太湖中的氨氮成份从北向南呈现为:0.36mg/L (水质Ⅱ)、0.15mg/L(水质Ⅰ)、0.24mg/L(水质Ⅱ)、1.96mg/L (水质Ⅴ)、0.92mg/L(水质Ⅲ)、2.05 mg/L(水质劣Ⅴ)。这些数据来自于围绕太湖的6个监测点,即江苏无锡沙渚、江苏宜兴兰山嘴、江苏苏州西山、上海青浦急水港、浙江嘉兴王江泾水和浙江嘉兴斜路港水质自动监测站。     

桶(瓶)装饮用纯净水微生物的控制

该文分析了桶(瓶)装饮用纯净水微生物孳生的成因,以及臭氧灭菌的利弊,并介绍了控制微生物的方法。     

工业废水中重金属离子的处理方法

对化学沉淀法、絮凝—浮选法、浮选法、离子交换法和膜过滤法处理含重金属离子废水的不同物理化学方法进行了回顾,并对这几种方法的优缺点与操作条件进行了比较离子交换法与膜过滤法是应用最广泛的两种方法。当废水中重金属离子如Cd(Ⅱ)、Cr(Ⅲ)、Cu(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)等的初始浓度为100mg/L时,离子交换法消除离子效率将近100%;这与反渗透法处理含Cd(Ⅱ)离子(初始浓度200 mg/L)废水效果接近。重金属离子的初始浓度大于为1000mg/L时,石灰沉淀法效果最好。     

Assessing dust exposure in an integrated iron and steel manufacturing plant in South India

A study to monitor and estimate respirable particulate matter (RPM), toxic trace metal concentrations in the work environment was carried out in different sections of an integrated steel manufacturing industry. The average RPM concentration observed varied according to the section blast furnace was 2.41 mg/m;{3}; energy optimization furnace, 1.87 mg/m;{3}; sintering plant, 0.98 mg/m;{3}; continuous casting machine, 1.93 mg/m;{3}. The average trace metal concentration estimated from the RPM samples like iron, manganese, lead and chromium did not exceed ACGIH prescribed levels.     

净水器用活性炭的选择与评价

活性炭是净水器的主要的材料之一,活性炭的选型对净水器的使用效果会产生显著的影响。通过对活性炭的吸附指标碘吸附值、亚甲基蓝吸附值与有机物去除效果的相关性研究,得出碘吸附值、亚甲基蓝值只能作为活性炭选型的参考指标,与净水效率没有相关性,应进行活性炭的耗氧量(CODMn)去除率评价来选择活性炭;并对净水器用粒状活性炭的理化指标提出了建议。     

生物活性炭柱(池)净水效果的影响因素

影响生物活性炭柱净水效果的主要因素有:滤速(停留时间)、炭层高度、水温和溶解氧等。     

Some Consequences of the Meadian Self*

Mead's conception of the self is analyzed as an internal interaction process, with the “I” viewed as taking perspectives rather than being simply a biologic response. Conceptualizing the self as an intrapersonal process of interaction from differentiated perspectives permits a better understanding of false fronting, autonomy, and creativity. Emergence theory allows us to take a Phenomenological view of the self. Several levels of consciousness in Mead's theory are analyzed, and connections with Berger and Luckmann's conceptions of objectivation and the symbolic universe are suggested.     

粉末活性炭-超滤膜工艺去除自来水中有机物的模型

该文介绍了以均质表面扩散模型和修正的Freundlich吸附等温线为基础建立的粉末活性炭-超滤膜（PAC—UF）系统对水中有机污染物的去除模型；分析了该模型能够有效预测PAC—UF系统对水中污染物去除的活性炭投量和使用周期，也为该系统反应器的设计提供了参考。     

复合式厌氧反应器处理含硫酸盐有机废水的研究

对复合式厌氧反应器处理含硫酸盐有机废水的工艺特性、动态特征进行了研究．试验结果表明在一定的有机负荷下,当进水SO42-浓度从1g／L提高到1．5g／L时,COD去除率约保持在67％,系统的稳定性增加;当继续提高硫酸盐浓度到2．5g／L时,反应体系发生深度恶化。此外,MPB受抑制的程度主要由H2S决定,SRB受抑制的程度主要由TS因素所决定。     

ACCOUNTING FOR THE OZONE HOLE:

In the early 1980s, accounts of ozone depletion in the popular press, Congressional hearings and scientific literature reported reduced projections of loss. This environmental problem did not seem as severe as many had predicted in the 1970s. However, in 1985 an unexplained Antarctic ozone hole was reported in the scientific literature. This paper looks at how earlier "incorrect" conclusions and the ozone hole itself were accounted for in the popular and semi-popular/scientific press and in Congressional hearings. It demonstrates an asymmetry in accounts. Scientists tended to be removed from accounts of earlier incorrect claims and blame was placed upon available models and nature itself. A form of an "empiricist repertoire" was drawn upon. However, scientists were brought back into and emphasized in accounts of actions on the ozone hole. I argue that scientists'and science writers'accounts effectively helped maintain the cognitive authority of science over a potentially serious environmental problem, but that they missed an opportunity for educating or reminding readers about important aspects of science, especially its processional nature and expected instability over time.     

Relationships among nutrients,chloride and biological indices in urban Maryland streams

Using a spatially extensive urban database constructed from the Maryland Biological Stream Survey (MBSS), we describe the relationships of nutrients in small-order streams to eight defined categories of percent catchment urbanization, correlations between chloride and conductivity in urban streams, and relationships between nutrients and chloride with two Maryland-specific indices of biotic integrity for benthic macroinvertebrates and fish assemblages. Stream nutrients become elevated with increasing percent catchment urbanization, followed by increases in all four measured nitrogen species and total phosphorus at catchment urbanization levels greater than 10%. There was a strong collinear relationship (r ² = 0.90) between chloride and conductivity (trimeans) across all eight urbanization classes, where Cl (mg/L) = −0.397 + 0.188*conductivity (μS/cm). Critical values for all water quality parameters with the two Maryland biological indices were derived using quantile regression, with significant regressions developed for 11 of 16 water quality parameters and the two biotic indices. For nitrate (NO₃-N), the critical thresholds between fair and poor stream quality for the two Maryland biological indices were 0.83 mg/L (benthic macroinvertebrate assemblages) and 0.86 mg/L (fish assemblages). Increasing stream nutrient and chloride levels, associated with widespread catchment urbanization intensity, now affect many small streams in Maryland, with implications for decreasing water quality in major tributaries and the Chesapeake Bay.     

Effects of oral testosterone undecanoate therapy on bone mineral density and body composition in 322 aging men with symptomatic testosterone deficiency: a 1-year,randomized, placebo-controlled,dose-ranging study

Abstract

Objective: We investigated the effects of oral testosterone undecanoate (TU) on bone mineral density (BMD), lean body mass (LBM) and body fat mass (BFM) in aging men with symptomatic testosterone deficiency (TD).

Methods: Three hundred twenty-two men ≥50 years with TD symptoms and calculated free testosterone <0.26?nmol/L participated in a multicenter, double-blind, placebo-controlled trial. Patients were randomized to placebo, oral TU 80?mg/d, oral TU 160?mg/d, or oral TU 240?mg/d, administered as divided doses with normal meals. BMD of the hip and lumbar spine were evaluated by dual energy X-ray absorptiometry (DEXA), and body composition (LBM and BFM) by whole body DEXA.

Results: Oral TU significantly increased BMD at Month 12 at the lumbar spine (240?mg/d), total hip (240?mg/d), and trochanter and intertrochanter (160 and 240?mg/d) compared with placebo. Oral TU significantly increased LBM at Months 6 and 12 for all oral TU groups compared with placebo. BFM significantly decreased at Month 6 (all oral TU groups) and Month 12 (160?mg/d) compared with placebo. The effects on BMD and body composition showed a clear dose response.

Conclusions: Treatment with oral TU led to improvement in BMD, LBM and BFM in aging men with symptomatic TD.     

Asthma Patients' Activities and Air Pollution: A Semiparametric Censored Regression Analysis

Asthma patients' health status may be especially sensitive to some types of air pollution, but the evidence on this is mixed. We explore the effects of ground-level ozone on asthma patient's activities, breaking apart the usual aggregated category of leisure into indoor and outdoor activities, and differentiating those by whether the activities were active or inactive. Applying the semiparametric censored estimation method we demonstrate that even though the period over which activities were observed was relatively low in ozone levels, there is a significant impact of ozone on a few activities. The (non-ozone) economic and demographic variables in the model play significant roles in explaining the allocation of time among seven activities, suggesting the suitability of the approach for other household decision-making contexts.