全文获取类型
收费全文 | 252篇 |
免费 | 5篇 |
国内免费 | 53篇 |
专业分类
安全科学 | 11篇 |
环保管理 | 45篇 |
综合类 | 113篇 |
基础理论 | 26篇 |
污染及防治 | 33篇 |
评价与监测 | 73篇 |
社会与环境 | 9篇 |
出版年
2023年 | 5篇 |
2022年 | 9篇 |
2021年 | 11篇 |
2020年 | 12篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 14篇 |
2016年 | 10篇 |
2015年 | 17篇 |
2014年 | 18篇 |
2013年 | 19篇 |
2012年 | 12篇 |
2011年 | 26篇 |
2010年 | 13篇 |
2009年 | 30篇 |
2008年 | 11篇 |
2007年 | 13篇 |
2006年 | 11篇 |
2005年 | 6篇 |
2004年 | 9篇 |
2003年 | 8篇 |
2002年 | 8篇 |
2001年 | 4篇 |
2000年 | 8篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1984年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有310条查询结果,搜索用时 15 毫秒
1.
This study profiled the bacterial community variations of water from four water treatment systems, including coagulation, sedimentation, sand filtration, ozonation-biological activated carbon filtration (O3-BAC), disinfection, and the tap water after the distribution process in eastern China. The results showed that different water treatment processes affected the bacterial community structure in different ways. The traditional treatment processes, including coagulation, sedimentation and sand filtration, reduced the total bacterial count, while they had little effect on the bacterial community structure in the treated water (before disinfection). Compared to the traditional treatment process, O3-BAC reduced the relative abundance of Sphingomonas in the finished water. In addition, ozonation may play a role in reducing the relative abundance of Mycobacterium. NaClO and ClO2 had different effects on the bacterial community in the finished water. The relative abundance of some bacteria (e.g. Flavobacterium, Phreatobacter and Porphyrobacter) increased in the finished water after ClO2 disinfection. The relative abundance of Mycobacterium and Legionella, which have been widely reported as waterborne opportunistic pathogens, increased after NaClO disinfection. In addition, some microorganisms proliferated and grew in the distribution system, which could lead to turbidity increases in the tap water. Compared to those in the finished water, the relative abundance of Sphingomonas, Hyphomicrobium, Phreatobacter, Rheinheimera, Pseudomonas and Acinetobacter increased in the tap water disinfected with NaClO, while the relative abundance of Mycobacterium increased in the tap water disinfected with ClO2. Overall, this study provided the detailed variation in the bacterial community in the drinking water system. 相似文献
2.
Yi Shi Akintunde Babatunde Bettina Bockelmann-Evans Qijie Li Liang Zhang 《环境科学学报(英文版)》2020,32(10):151-162
Within the drinking water distribution system (DWDS) using chloramine as disinfectant, nitrification caused by nitrifying bacteria is increasingly becoming a concern as it poses a great challenge for maintaining water quality. To investigate efficient control strategies, operational conditions including hydraulic regimes and disinfectant scenarios were controlled within a flow cell experimental facility. Two test phases were conducted to investigate the effects on the extent of nitrification of three flow rates (Q = 2, 6, and 10 L/min) and four disinfection scenarios (total Cl2=1 mg/L, Cl2/NH3-N=3:1; total Cl2=1 mg/L, Cl2/NH3-N=5:1; total Cl2=5 mg/L, Cl2/NH3-N=3:1; and total Cl2=5 mg/L, Cl2/NH3-N=5:1). Physico-chemical parameters and nitrification indicators were monitored during the tests. The characteristics of biofilm extracellular polymetric substance (EPS) were evaluated after the experiment. The main results from the study indicate that nitrification is affected by hydraulic conditions and the process tends to be severe when the fluid flow transforms from laminar to turbulent (2300<Re<4000). Increasing disinfectant concentration and optimizing Cl2/NH3-N mass ratio were found to inhibit nitrification to some extend when the system was running at turbulent condition (Q = 10 L/min, Re = 5535). EPS extracted from biofilm that was established at the flow rate of 6 L/min had greater carbohydrate/protein ratio. Furthermore, several nitrification indicators were evaluated for their prediction efficiency and the results suggest that the change of nitrite, together with total organic carbon (TOC) and turbidity can indicate nitrification potential efficiently. 相似文献
3.
4.
5.
国内外饮用水水质标准的综合评价 总被引:2,自引:0,他引:2
在参考国内外饮用水水质标准的基础上,建立了饮用水水质综合评价体系,通过专家咨询法获得判断矩阵,利用层次分析法计算各水质指标的权重,结合国内外饮用水水质标准的指标进行层次总排序,根据总排序结果对国内外饮用水水质标准的特点进行了综合评价。 相似文献
6.
7.
以东圳水库为例论述了饮用水源保护与库区果园实行农业清洁生产的关系,并对饮用水源的保护提出一些对策措施。 相似文献
8.
9.
随着生活水平的不断提高,人们对饮用水质量提出了更高的要求,而水环境质量的普通恶化又使人们不得不考虑饮用水的安全性。在简介了我国水资源现状的基础上,文中阐述了水质问题的重要性和我国水体环境质量的严峻性,指出了水质问题不仅制约着社会经济的发展,更直接地丰人们饮用水的安全性,已成为进入21世纪我国水资源问题的主要矛盾;在分析了我国水资源水质管理存在问题的基础上,从法律、法规、政策、经济等方面,着重探讨了加强水质管理与解决水资源供需矛盾和保证饮用水安全的关系。 相似文献
10.