全文获取类型
收费全文 | 553篇 |
免费 | 5篇 |
国内免费 | 180篇 |
专业分类
安全科学 | 29篇 |
废物处理 | 17篇 |
环保管理 | 61篇 |
综合类 | 365篇 |
基础理论 | 65篇 |
污染及防治 | 174篇 |
评价与监测 | 18篇 |
社会与环境 | 9篇 |
出版年
2023年 | 13篇 |
2022年 | 21篇 |
2021年 | 26篇 |
2020年 | 29篇 |
2019年 | 33篇 |
2018年 | 25篇 |
2017年 | 29篇 |
2016年 | 27篇 |
2015年 | 46篇 |
2014年 | 25篇 |
2013年 | 45篇 |
2012年 | 20篇 |
2011年 | 52篇 |
2010年 | 21篇 |
2009年 | 43篇 |
2008年 | 31篇 |
2007年 | 40篇 |
2006年 | 29篇 |
2005年 | 21篇 |
2004年 | 19篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 23篇 |
2000年 | 24篇 |
1999年 | 12篇 |
1998年 | 11篇 |
1997年 | 11篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 10篇 |
1991年 | 1篇 |
排序方式: 共有738条查询结果,搜索用时 15 毫秒
151.
152.
厌氧-吹脱-好氧-吸附法处理酱油废水 总被引:5,自引:0,他引:5
针对酱油废水的高CODCr、高色度、高挥发酸以及含盐的特点,设计了用厌氧-吹脱-好氧-吸附法处理酱油废水的工艺。实验结果表明,该工艺对酱油废水的处理有较好的处理效果。当厌氧进水的CODCr分别为6000~8000和1500~2000mg/L,色度分别为5000和1800倍左右时,厌氧反应的水力停留时间(HRT)分别为3~4和2d,吹脱池的停留时间为16h,气水比为0.01m^3/L,好氧反应器和煤渣吸附池的停留时间分别为14~18和14~16h时,该流程对废水CODCr的总平均去除率分别达到90%和82.7%左右,对色度的总平均去除率分别为76.7%和86.5%。 相似文献
153.
154.
155.
156.
Microbial degradation of methyl tert-butyl ether and tert-butyl alcohol in the subsurface 总被引:16,自引:0,他引:16
The fate of fuel oxygenates such as methyl tert-butyl ether (MTBE) in the subsurface is governed by their degradability under various redox conditions. The key intermediate in degradation of MTBE and ethyl tert-butyl ether (ETBE) is tert-butyl alcohol (TBA) which was often found as accumulating intermediate or dead-end product in lab studies using microcosms or isolated cell suspensions. This review discusses in detail the thermodynamics of the degradation processes utilizing various terminal electron acceptors, and the aerobic degradation pathways of MTBE and TBA. It summarizes the present knowledge on MTBE and TBA degradation gained from either microcosm or pure culture studies and emphasizes the potential of compound-specific isotope analysis (CSIA) for identification and quantification of degradation processes of slowly biodegradable pollutants such as MTBE and TBA. Microcosm studies demonstrated that MTBE and TBA may be biodegradable under oxic and nearly all anoxic conditions, although results of various studies are often contradictory, which suggests that site-specific conditions are important parameters. So far, TBA degradation has not been shown under methanogenic conditions and it is currently widely accepted that TBA is a recalcitrant dead-end product of MTBE under these conditions. Reliable in situ degradation rates for MTBE and TBA under various geochemical conditions are not yet available. Furthermore, degradation pathways under anoxic conditions have not yet been elucidated. All pure cultures capable of MTBE or TBA degradation isolated so far use oxygen as terminal electron acceptor. In general, compared with hydrocarbons present in gasoline, fuel oxygenates biodegrade much slower, if at all. The presence of MTBE and related compounds in groundwater therefore frequently limits the use of in situ biodegradation as remediation option at gasoline-contaminated sites. Though degradation of MTBE and TBA in field studies has been reported under oxic conditions, there is hardly any evidence of substantial degradation in the absence of oxygen. The increasing availability of field data from CSIA will foster our understanding and may even allow the quantification of degradation of these recalcitrant compounds. Such information will help to elucidate the crucial factors of site-specific biogeochemical conditions that govern the capability of intrinsic oxygenate degradation. 相似文献
157.
几种湿式烟气脱硫吸收反应的热力学分析 总被引:4,自引:0,他引:4
计算了3种湿式烟气脱硫吸收反应达到平衡态时SO2的分压力。计算结果显示:对于3种湿式脱硫反应,平衡态SO2的分压力都随温度的升高而增大。所以从化学热力学角度看反应温度高不利于脱硫。综合考虑脱硫效率、运行费用、是否堵塞等因素,推荐采用双碱法进行烟气脱硫。 相似文献
158.
《环境科学学报(英文版)》2023,35(4):275-286
Preparing materials for simultaneous remediation of anionic and cationic heavy metals contamination has always been the focus of research. Herein a biochar supported FeMnMg layered double hydroxide (LDH) composites (LB) for simultaneous remediation of copper and arsenic contamination in water and soil has been assembled by a facile co-precipitation approach. Both adsorption isotherm and kinetics studies of heavy metals removal by LB were applied to look into the adsorption performance of adsorbents in water. Moreover, the adsorption mechanisms of Cu and As by LB were investigated, showing that Cu in aqueous solution was removed by the isomorphic substitution, precipitation and electrostatic adsorption while As was removed by complexation. In addition, the availability of Cu and As in the soil incubation experiments was reduced by 35.54%–63.00% and 8.39%–29.04%, respectively by using LB. Meanwhile, the addition of LB increased the activities of urease and sucrase by 93.78%–374.35% and 84.35%–520.04%, respectively, of which 1% of the dosage was the best. A phenomenon was found that the richness and structure of microbial community became vigorous within 1% dosage of LB, which indirectly enhanced the passivation and stabilization of heavy metals. These results indicated that the soil environment was significantly improved by LB. This research demonstrates that LB would be an imaginably forceful material for the remediation of anionic and cationic heavy metals in contaminated water and soil. 相似文献
159.
160.