全文获取类型
收费全文 | 73篇 |
免费 | 11篇 |
国内免费 | 96篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 1篇 |
环保管理 | 13篇 |
综合类 | 120篇 |
基础理论 | 16篇 |
污染及防治 | 18篇 |
评价与监测 | 7篇 |
社会与环境 | 3篇 |
出版年
2023年 | 3篇 |
2022年 | 10篇 |
2021年 | 9篇 |
2020年 | 9篇 |
2019年 | 9篇 |
2018年 | 10篇 |
2017年 | 22篇 |
2016年 | 8篇 |
2015年 | 14篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 12篇 |
2011年 | 12篇 |
2010年 | 5篇 |
2009年 | 11篇 |
2008年 | 5篇 |
2007年 | 4篇 |
2006年 | 11篇 |
2005年 | 9篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2001年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有180条查询结果,搜索用时 31 毫秒
41.
臭氧-混凝交互作用对混凝效果的影响 总被引:1,自引:1,他引:0
采用臭氧-混凝联用(臭氧与混凝剂同时投加)和预臭氧混凝(预臭氧后待水中臭氧浓度为0后再投加混凝剂)两种方式处理水样,分析其氧化、混凝效果和消毒副产物生成势(DBPFP)等的差异,研究臭氧-混凝交互作用对处理效果的影响.结果表明,联用和预臭氧混凝效果之间存在明显差异.联用工艺中臭氧与混凝剂间发生交互作用,导致混凝剂水解形态分布发生改变是影响混凝效果的重要原因.联用处理后水样的浊度高于预臭氧混凝,主要原因之一在于臭氧降低了混凝剂水解形态分布中Alb的含量;Cl-DBPFP低于预臭氧混凝出水,是混凝剂Al Cl3及其某些水解形态对臭氧具有催化氧化的作用,促进了消毒副产物前驱物的氧化降解所致.联用对MCAA和CF生成势的去除效果显著强于预臭氧混凝,其中MCAAFP分别为5.6μg·L-1和16.9μg·L-1,CFFP分别为12.5μg·L-1和24.1μg·L-1.臭氧与混凝剂交互作用显著影响混凝效果及消毒副产物的生成,是臭氧和混凝配合使用安全性研究中需要重点关注的内容.因而,相关科研和实际水处理工艺中必须明确预臭氧及混凝剂投加位点和相对次序. 相似文献
42.
Seidel B Alm M Peters R Kördel W Schäffer A 《Environmental science and pollution research international》2006,13(2):125-130
Background Due to the bovine spongiform encephalopathy (BSE), specified risk material (SRM) as well as animal meat and bone meal (MBM)
are banned from the food and feed chain because of a possible infection with pathogenic prions (PrPSc). Nowadays, prions are
widely accepted to be responsible for TSE(transmissible spongiform encephalopathies)-caused illnesses like BSE and scrapie,
and especially for the occurrence of the new variant of CJD in humans. Presently, SRM and MBM are burnt under high temperatures
to avoid any hazards for humans, animals or the environment. The aim of this study was to evaluate a method using animal fat
separated from Category I material which includes SRM and the carcasses of TSE-infected animals, or animals suspected of being
infected with TSE, as a source for producing biodiesel by transesterification, analogous to the biodiesel process using vegetable
oil.
Methods For this purpose, animal fat was spiked with scrapie-infected hamster brain equivalents – as representative for a TSE-infected
animal – and the biodiesel manufacturing process was downscaled and performed under lab-scale conditions.
Results and Discussion The results analysed by Western blotting showed clearly that almost each single step of the process leads to a significant
reduction of the concentration of the pathogenic prion protein (PrPSc) in the main and side-products.
Conclusion The data revealed that the biodiesel production, even from material with a high concentration of pathogenic prions, can be
considered as safe.
Recommendations and Outlook The obtained results indicated that biodiesel produced from prion-contaminated fat was safe under the tested process conditions.
However, it has to be pointed out that the results cannot be generalized because a different process control using other conditions
may lead to different results and then has to be analysed independently. It is clear that the production of biodiesel from
high risk material represents a more economic usage than the combustion of such material. 相似文献
43.
Occurrence of halogenated disinfection by-products (DBPs) (trihalomethanes –THMs– and haloacetic acids –HAAs–) in the waters
of two utilities in Quebec City (Canada) was investigated using two approaches: experimental chlorination studies and full-scale
sampling within distribution systems. Experimental studies were designed to reproduce treatment plant and distribution system
conditions (chlorine dose, water temperature, pH and water residence time). Differences in halogenated DBPs in the two distribution
systems under study were significant and comparable to those observed in experimental laboratory studies. For the waters of
both utilities, chlorination studies better reproduced the occurrence of halogenated DBPs in points of the distribution system
located near the treatment plant (low residence time of water) than in other points. Multivariate regression models for THMs,
HAAs and their species were developed using the data from experimental studies in order to predict halogenated DBP levels
measured in the distribution system. Models were all statistically significant, but showed low ability to predict full-scale
halogenated DBPs, particularly in points located at distribution system extremities. Specifically, experimental chlorination-based
models are not able to simulate the decrease of HAA levels. Results of this research suggest that the use of experimental
data to predict halogenated DBP levels in full-scale distribution systems – for operational, regulatory and epidemiological
purposes – must be done with caution. 相似文献
44.
45.
46.
Quaternized agricultural by-products as anion exchange resins 总被引:3,自引:0,他引:3
The objectives of this study were the chemical modification of readily available, low-cost agricultural by-products to anion exchange resins and the selection of the best modified by-product for further use in anion removal. Resins were prepared through the quaternization of a series of 12 agricultural by-products with N-(3-chloro-2-hydroxypropyl) trimethylammonium chloride (CHMAC). Phosphate ion adsorption assays were conducted at pH 7 in order to compare adsorption properties among the by-products. Quaternized corn stover showed the highest phosphorus adsorption at 0.66 mmole/g. Since corn stover exhibited the best uptake of phosphate ion, it was compared to a commercially available, cellulose-based anion exchange resin. Additionally, adsorption capacities of quaternized corn stover for arsenate, chromate, and selenate were evaluated and adsorption efficiencies were determined in simulated wastewater samples. Our results indicate that modified corn stover demonstrates good adsorption uptake for arsenate and selenate and especially for chromate. 相似文献
47.
饮用水中内分泌干扰物双酚A的臭氧氧化降解研究 总被引:14,自引:1,他引:13
采用臭氧氧化工艺对饮用水中内分泌干扰物双酚A特性进行了研究.研究表明:在原水浓度为1.0mg/L左右,臭氧总投加量为1.0、1.5和2.0mg/L条件下,30min BPA去除率可达70%、82%和90%.通过考察不同臭氧投加量、不同本底条件、不同BPA初始浓度和不同臭氧投加时间对BPA臭氧氧化的影响,分析得出臭氧投加量对BPA的降解占主导地位,而臭氧接触时间对去除效果的影响很小;采用紫外波长扫描确定在臭氧降解BPA的同时生成了在UV254上有吸收的产物.通过考察臭氧氧化双酚A过程中UV254的变化,提出低臭氧投加量下BPA不能完全被氧化,而采用缩短臭氧投加时间、加大臭氧投加量以及提高水中余臭氧浓度等方法,有利于水中BPA的完全降解. 相似文献
48.
Because of increasing need to balance health risks for pathogen control and disinfection by-products (DBP) formation in drinking water supplies, water utilities are forced to closely examine and optimize their disinfection practices. This research was designed to investigate the effects of independent variables of dissolved organic carbon (DOC), ferric chloride dosage, chlorine dose, and reaction time on trihalomethanes (THMs) formation in Terkos Lake Water (TLW) of Istanbul City. A statistically-based empirical model was developed for predicting THM formation during enhanced coagulation. The R
2 and F value of model were 0.762 and 460, respectively. The model was found to be statistically significant for all four variables, and model predictions appear to be most accurate for this study. A multiple linear model exhibited the best fit of data. It was observed that THM formation depended primarily on DOC removal. Model calibration, testing and validation were accomplished by using independent data set. 相似文献
49.
Size and resin fractionations of dissolved organic matter and trihalomethane precursors from four typical source waters in China 总被引:3,自引:0,他引:3
Wei Q Wang D Wei Q Qiao C Shi B Tang H 《Environmental monitoring and assessment》2008,141(1-3):347-357
Dissolved organic matter (DOM) and its potential to form disinfection by-products (DBPs) during drinking water treatment raise
challenges to water quality control. Understanding both chemical and physical characteristics of DOM in source waters is key
to better water treatment. In this study, the DOM from four typical source waters in China was fractionated by XAD resin adsorption
(RA) and ultrafiltration (UF) techniques. The trihalomethane formation potential (THMFP) of all fractions in the DOM were
investigated to reveal the major THM precursors. The fraction distributions of DOM could be related to their geographical
origins in a certain extent. The dominant chemical fraction as THM precursors in the DOM from south waters (East-Lake reservoir
in Shenzhen and Peal rivers in Guangzhou) was hydrophobic acid (HoA). The size fraction with molecular weight (MW) <1 kDa
in both south waters had the highest THMFP. The results of cluster analysis showed that the parameters of fractions including
DOC percentage (DOC%), UV254%, SUVA254 (specific UV254 absorbance) and THMFP were better for representing the differences of DOM from the studied waters than specific THMFP (STHMFP).
The weak correlation between SUVA254 and STHMFP for either size or XAD fractions suggests that whether SUVA254 can be used as an indicator for the reactivity of THM formation is highly dependent on the nature of organic matter. 相似文献
50.
Raquel Melgar Emilio Benitez Rogelio Nogales 《Journal of environmental science and health. Part. B》2013,48(5):488-495
The present work evaluates the possible bioconversion of wet olive cake by low-cost biostabilization (vermicomposting process). Wet olive cake fresh (WOC), precomposted (WOCP), or mixed with biosolids (WOCB), were vermicomposted for 6 months to obtain organic amendments for agricultural and remediation purposes. The results showed initial differences depending on previous treatment. WOCP was initially more stable, presented a low C:N ratio, and showed more dehydrogenase and urease activity. By contrast, there was no dehydrogenase activity initially in WOC and WOCB, due to the presence of some different types of polyphenols. Finally, the end product showed relatively higher amounts of total nitrogen and humic acid and met the standard of quality for composts and vermicomposts for use both in conventional and organic agriculture and soil-restoration programs. 相似文献