全文获取类型
收费全文 | 168篇 |
免费 | 11篇 |
国内免费 | 38篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 4篇 |
环保管理 | 33篇 |
综合类 | 87篇 |
基础理论 | 21篇 |
污染及防治 | 41篇 |
评价与监测 | 9篇 |
社会与环境 | 4篇 |
灾害及防治 | 2篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 2篇 |
2020年 | 3篇 |
2019年 | 12篇 |
2018年 | 2篇 |
2017年 | 6篇 |
2016年 | 2篇 |
2015年 | 5篇 |
2014年 | 14篇 |
2013年 | 25篇 |
2012年 | 28篇 |
2011年 | 21篇 |
2010年 | 15篇 |
2009年 | 15篇 |
2008年 | 14篇 |
2007年 | 5篇 |
2006年 | 1篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 5篇 |
2000年 | 6篇 |
1999年 | 3篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1985年 | 2篇 |
排序方式: 共有217条查询结果,搜索用时 15 毫秒
81.
F/M对ASBR中基质的吸收、储存和利用影响 总被引:1,自引:0,他引:1
研究了不同F/M(COD/VSS)下以葡萄糖为基质时厌氧序批式反应器(ASBR)中的微生物代谢规律.结果表明,在序批操作条件下,水解产酸菌对葡萄糖的代谢存在2条并列的途径,即直接代谢为VFA和首先转化为胞内储存物糖原,然后糖原再被转化为VFA.前者约占进水COD的34%~38%,而后者则高达41%~46%.F/M越高,糖原的储存量越大,当F/M分别为0.27、 0.20和0.14时,单位质量污泥糖原的最大储存量分别为116.8、 81.1和62.4 mg/g.糖原的储存减缓了VFA的积累,为ASBR反应器的高效和正常运行创造了条件. 相似文献
82.
生物絮凝剂产生菌的分离鉴定及其在饮用水除浊上的作用 总被引:1,自引:0,他引:1
从活性污泥中筛选分离到一株高效生物絮凝荆产生菌F1,鉴定为克雷伯氏菌属(Klebsiella sp.).对其所产生物絮凝剂MBF1进行初步提取,考察了MBF1对长江原水浊度的去除效果.结果表明,在对长江原水处理中絮凝荆MBF1用量为40mg·L-1时,长江原水浊度和CODCr从处理前的56.2NTU和42.67mg·L-1下降到0.6NTU和13.47mg·L-1,去除率可达到99.0%和68.4%,处理后水的两指标达到饮用水标准.同时,比较了生物絮凝剂MBF1与聚合氯化铝、聚丙烯酰胺等化学絮凝剂对长江原水浊度的处理效果,结果发现MBF1具有用量更少(40mg·L-1),适应性广(pH 1~10,温度0~45℃条件下都有较好处理效果,且对搅拌程序无特殊要求)及处理效果好的特点.动物急毒性试验表明,该絮凝剂无急毒性反应,在给水处理中具有良好的应用前景. 相似文献
83.
Assessment of polychlorinated dibenzo-p-dioxins and dibenzofurans in sludges according to the European environmental policy 总被引:1,自引:0,他引:1
The amount of sewage sludge generated in Europe is expected to surpass the 10 million tons/year in 2006 as a result of the waste water treatment process according to the Water Policy in European Union. Sewage sludge is what is left behind after water is cleaned in waste treatment plants and is characterized for this high content in nitrogen and phosphorous that could be of great importance in agriculture as fertilizer or soil conditioner. On the other hand, pollutants like metals and organic contaminants are usually removed from water and are accumulated in the sewage sludge, reaching the food chain if their concentrations are not below the safe limits established by the European legislation. The latter issue is of great concern nowadays and in this sense, different works alert against the use of the sewage sludge in agriculture arguing that serious illnesses, even resulting in death as well as adverse environmental impacts are associated to the application of sewage sludge. This work is a continuation of a former comprehensive survey on of priority organic pollutant in sludges for agricultural purposes carried out by our group in Catalonia and this time is focused on the polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F), one of the most toxic group of organic compounds listed in the Work Document on Sludge which is the reference tool in this field in Europe and is also included in the Stockholm Convention. Eighty eight samples were collected from the end of 2003 to April 2006 and the concentrations detected were lower than the 100 ng/kg I-TEQ limit recommended by the European legislation (EC, 2000). Thus, sewage sludges generated in Catalonia do not represent a threat to human health if they are used as fertilizers in agriculture. 相似文献
84.
近年来,随着环境监测技术规范化建设的不断发展,国家环保部相继出台了包括火力发电、水泥制造、汽车制造、造纸工业在内的12个不同行业类型的建设项目竣工验收技术规范。然而,造纸污泥综合利用热电项目验收监测尚未列入规范编制日程,其中工程调查、标准制定、点位布设和报告编制等环节仍存在一定误区和难点。文章例从上述薄弱环节入手,对常见难点问题提出了相应的解决办法.可供广大环境监测工作者参考和借鉴。 相似文献
85.
The effects of bisphenol A (BPA) were examined on sex hormones of F1 generation male rats during weaning period. Female rats were exposed to BPA from day 0 after pregnancy to the weaning period at doses of 50, 100, or 200 mg kg?1. The sex hormone levels of F1 generation male rats were determined. This study shows that F0 generation female rats fed with 200 mg kg?1 BPA had a significantly higher serum prolactin (PRL) levels at the end of weaning. Significantly higher levels of serum estradiol (E2) were also found in female rats fed 100 or 200 mg kg?1 BPA. Serum levels of E2 in F1 male generation rats were higher in treatment groups compared to control groups while serum testosterone (T) levels were lower. Follicle stimulating hormone (FSH) in F1 generation rats fed 200 mg kg?1 was markedly decreased. The relative testicular weights were significantly less in 100 and 200 mg kg?1 BPA groups. BPA was found to alter the sex hormone levels in F1 male rats during weaning period and thus disrupted endocrine functions. 相似文献
86.
Carbon leakage is of interest in both academic and policy debates about the effectiveness of unilateral climate policy, especially in Europe, where the EU Emissions Trading System (EU ETS) affects many traded sectors. We review how the literature identifies leakage and the pollution haven effect. We then evaluate whether EU ETS emission costs caused carbon leakage in European manufacturing, using trade flows in embodied carbon and value from the Global Trade Analysis Project (GTAP). We find no evidence that the EU ETS caused carbon leakage. 相似文献
87.
对流层臭氧(O3)主要由氮氧化物(NOx)和挥发性有机物(VOCs)经过一系列光化学反应生成,反应过程呈现复杂的非线性关系.为深入了解O3的光化学特征及生成机制,利用2018年夏季大气O3与VOCs的观测数据,结合大气零维框架模拟模型F0AM-MCM,研究O3超标日和非O3超标日的O3光化学特征之间的差异性.观测结果表明,O3超标日期间φ(O3)和φ(TVOCs)的平均值分别为47.8×10-9和49.0×10-9,为非O3超标日期间O3(26×10-9)和TVOCs(30×10-9)体积分数的1.8倍和1.6倍.使用F0AM模型,借助EKMA曲线和RIR分析等识别O3敏感性,发现南京市O3超标日和非O3超标日O3的形成均主要受VOCs和NOx的协同控制.F0AM-MCM模拟结果表明,在O3超标日,·OH和HO2的日平均混合比分别是非O3超标日的1.3倍和1.8倍,表明O3超标日期间具有更强的大气氧化能力,且·OH和HO2的形成和损失速率也有明显的增加,表明自由基循环的增强.此外,O3超标日的O3生成速率明显高于非O3超标日,从而导致了O3超标日的O3净生成速率明显高于非O3超标日.以上发现提高了对南京夏季O3超标日大气O3光化学特征的认识. 相似文献
88.
确定开采下限,对高突危险水体上煤层的安全开采具有十分重要的意义。本文基于肥城矿区地质条件,用FLAC3D软件,对开采煤层下伏岩层移动变形规律进行了深入研究,对煤层底板三带范围进行了初步确定;同时,从不同方面对煤层底板开采破坏深度进行了理论计算。根据突水系数、导水带深度、导升带高度和经验数据,确定出正常条件下带压开采的下限(-720m)以及安全措施条件下(底板预注浆处理等)的带压开采下限(-850m)。依据开采下限,对带压开采条件进行了分析,初步形成了高突危险水体上煤层带压开采的分区分类,划分了"开采相对安全区(安全开采区、次安全开采区、条件安全开采区)、深部突水危险区、构造突水危险区",为确定安全开采技术与工艺奠定了理论基础。 相似文献
89.
90.