全文获取类型
收费全文 | 168篇 |
免费 | 17篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 19篇 |
废物处理 | 11篇 |
环保管理 | 9篇 |
综合类 | 94篇 |
基础理论 | 30篇 |
污染及防治 | 41篇 |
评价与监测 | 4篇 |
社会与环境 | 6篇 |
灾害及防治 | 4篇 |
出版年
2022年 | 8篇 |
2021年 | 6篇 |
2020年 | 9篇 |
2019年 | 2篇 |
2018年 | 8篇 |
2017年 | 13篇 |
2016年 | 6篇 |
2015年 | 13篇 |
2014年 | 8篇 |
2013年 | 13篇 |
2012年 | 9篇 |
2011年 | 21篇 |
2010年 | 12篇 |
2009年 | 10篇 |
2008年 | 9篇 |
2007年 | 7篇 |
2006年 | 16篇 |
2005年 | 9篇 |
2004年 | 6篇 |
2003年 | 8篇 |
2002年 | 7篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 4篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1984年 | 1篇 |
排序方式: 共有218条查询结果,搜索用时 359 毫秒
131.
132.
污泥中不稳定Cr的存在严重威胁环境安全和人体健康。利用正交试验方法优化Ca(H2PO4)2与污泥的混合比、热解终温、升温速率和停留时间,分析其对残渣特性及Cr稳定性的影响。结果表明:热解使污泥中的CH2基团、脂肪族硝基-NO2和硫酸氢盐分解。在添加Ca(H2PO4)2后,残渣中出现了磷酸PO基团、磷酸二氢盐PO2基团和磷酸盐PO4基团。Ca(H2PO4)2在共热解过程中转化为Ca(PO3)2,同时Cr在残渣中会形成Cr2(SO4)3晶型化合物。当Ca(H2PO4)2与污泥的质量比为15%、热解终温为650℃、升温速率为15℃/min、停留时间为90 min时,Cr的残渣态(F4)比例最高。此外,添加15%或30%的Ca(H2PO4)2共热解后,残渣中Cr浸出浓度满足GB/T 14848-2017《地下水质量标准》中Ⅳ类水质要求,表明添加Ca(H2PO4)2共热解可促进污泥中Cr的稳定化。 相似文献
133.
为保证加油站油气回收系统的实施效果,专门研制了加油站油气回收在线监控系统,该系统可以实时采集油气回收系统的气液比、密闭性等参数,并通过电力载波技术将数据传输到室内的监控机中进行存储、分析、报警和远传。实际测试表明,该系统性能稳定、成本低廉、安装简单,无需专门铺设通讯电缆,可以很好地满足现场要求。 相似文献
134.
An overview of the spatial and temporal variations of the environmental accidents in China in recent years was presented in this paper using available data. The results showed that the frequency of pollution accidents was significantly decreased, from 3462 in 1990 to 462 in 2007. The water and air pollution accidents were found to be the dominant types, accounting for more than 80% of the total accidents. Considering the classification of environmental accidents at 4 scales, the general environmental accident, i.e., the least serious type, was the most frequent event, taking up 58.98% of the total pollution accidents. In addition, the distribution of environmental accidents was generally in accordance with the industrial layout in the country during the past decade. It is very important to note that the extraordinarily severe environmental accidents showed an increasing trend in underdeveloped regions, which was caused by the transfer and the development of heavy polluted industry in these areas. As to the losses of environmental accidents, the casualties presented an obvious reduction tendency, while the direct economic loss per accident tended to climb up. Furthermore, some key factors that affect the spatial and temporal tendencies of environmental accidents in China were discussed and some suggestions were put forward, hoping to shed light on environmental risk management and emergency plans making associated with environmental accidents in China. 相似文献
135.
Zhang Ziteng Gu Weihua Bai Jianfeng Zhuang Xuning Zhao Jing Zhang Chenglong Wang Jingwei 《Journal of Material Cycles and Waste Management》2022,24(6):2365-2374
Journal of Material Cycles and Waste Management - Monolithic ceramic capacitors (MLCCs) contain a high level of silver. This paper describes a method to recover silver from the waste MLCCs. First,... 相似文献
136.
南太湖地区湖州市大气PM_(2.5)中多环芳烃的研究——污染现状和人体暴露健康风险评价 总被引:1,自引:0,他引:1
运用智能综合大气采样仪采集了南太湖地区湖州市大气PM 10和PM 2.5样品,采用高效液相色谱检测了该样品中16种多环芳烃化合物,通过苯并(a)芘(Ba P)致癌等效浓度、人群终身超额致癌风险和预期寿命损失等指标,评价湖州市大气PM2.5中多环芳烃的人群健康风险。结果表明:全市大气PM 2.5中多环芳烃全年总平均浓度为11.59 ng/m 3,季平均浓度范围在4.775~23.98 ng/m3之间,季节之间呈现一定的变化,冬季秋季春季夏季;全市大气PM 2.5中多环芳烃的苯并(a)芘总致癌等效浓度(TEQ)年均值为1.138 ng/m3,污染所致的成人和儿童的终身超额致癌风险分别为8.7×10-6和6.0×10-6,成人的预期寿命损失为44.5 min。 相似文献
137.
138.
纳米技术在环境污染防治中的应用 总被引:7,自引:1,他引:6
从大气污染控制与水污染控制等方面综述了纳米技术的研究及应用进展,并展望了纳米技术的发展前景。 相似文献
139.
Weihua Zhao Meixiang Wang Jianwei Li Yu Huang Baikun Li Cong Pan Xiyao Li Yongzhen Peng 《Frontiers of Environmental Science & Engineering》2018,12(5):8
Because the efficiency of biological nutrient removal is always limited by the deficient carbon source for the low carbon/nitrogen (C/N) ratio in real domestic sewage, the denitrifying phosphorus removal (DNPR) was developed as a simple and efficient method to remove nitrogen and phosphorous. In addition, this method has the advantage of saving aeration energy while reducing the sludge production. In this context, a pre-denitrification anaerobic/anoxic/post-aeration + nitrification sequence batch reactor (pre-A2NSBR) system, which could also reduce high ammonia effluent concentration in the traditional two-sludge DNPR process, is proposed in this work. The pre-A2NSBR process was mainly composed of a DNPR SBR and a nitrifying SBR, operating as alternating anaerobic/anoxic/post-aeration + nitrification sequence. Herein, the long-term performance of different nitrate recycling ratios (0–300%) and C/N ratios (2.5–8.8), carbon source type, and functional microbial community were studied. The results showed that the removal efficiency of total inorganic nitrogen (TIN, including NH4+-N, NO2– -N, and NO3– -N) gradually increased with the nitrate recycling ratios, and the system reached the highest DNPR efficiency of 94.45% at the nitrate recycling ratio of 300%. The optimum C/N ratio was around 3.9–7.3 with a nitrogen and phosphorus removal efficiency of 80.15% and 93.57%, respectively. The acetate was proved to be a high-quality carbon source for DNPR process. The results of fluorescence in situ hybridization (FISH) analysis indicated that nitrifiers and phosphorus accumulating organisms (PAOs) were accumulated with a proportion of 19.41% and 26.48%, respectively. 相似文献
140.
活性炭生物转盘法处理化工废水 总被引:1,自引:0,他引:1
使用固定剂将颗粒状活性炭固定在盘片上,制成了一种新型生物转盘盘片——活性炭生物转盘盘片。采用一级微型生物转盘法处理模拟化工废水,对比了活性炭、石英砂、聚丙烯3种生物转盘的处理效果。实验结果表明,活性炭生物转盘对COD的去除效果好于其他两种转盘。在进水COD为600mg/L、水力停留时间为6h、盘片转速为4r/min的条件下,活性炭生物转盘对COD的去除率可达71.3%。此外,活性炭生物转盘还有较强的耐有机负荷冲击能力。在废水处理过程中,活性炭仅在挂膜的前7天起吸附作用,挂膜成功后生物降解起主导作用。 相似文献