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941.
Use of multi-objective dredging for remediation of contaminated sediments: a case study of a typical heavily polluted confluence area in China 总被引:3,自引:0,他引:3
942.
Jingjing Fang Fan Lü Hua Zhang Liming Shao 《Journal of the Air & Waste Management Association (1995)》2013,63(12):1446-1455
An integrated approach was applied to identify the key odorants comprising emissions from different zones in two adjacent waste treatment facilities (an aerobic biological treatment plant and an anaerobic landfill site), identify their precise sources, and distinguish the interactive influences between them. Seven odor families were investigated, including alcohols, terpenes, carbonyls, aromatics, volatile fatty acids (VFAs), sulfur compounds, and ammonia. Principal components analysis, characteristic molecular ratios, and ternary diagrams were used to differentiate the interactive influence of the odor sources. Among typical biotic compounds, terpenes were found to be more suitable as odor markers for their better fingerprinting character than sulfur compounds and VFAs. Ratios of p-cymene at sampling locations related to the biological treatment plant (aerobic status) were between 0.00 and 0.25, whereas those at landfill-related sampling points (anaerobic status) were between 0.25 and 1.0. The molecular ratio of terpenes was also found to be an appropriate means to differentiate between homologous and similar odor sources such as an aerobic biological treatment plant and anaerobic landfill.Implications:?The aim of this work is to identify the key odorants comprising emissions from different zones in two adjacent waste treatment facilities, identify their precise sources, and distinguish the interactive influences between them. The emission of gaseous pollutants greatly affects the living quality of nearby residents, and odor complaints are becoming a major problem. In this study we utilized various pretreatment and analytical methods to obtain integrated emission information of gaseous pollutants. The results showed terpenes were found to be more suitable as odor markers for their better fingerprinting character than sulfur compounds and VFAs. 相似文献
943.
在水源污染越来越严重、水质标准日益严格的背景下,超滤(UF)已逐渐成为替代饮用水常规处理技术的最佳选择之一。本研究中采用相转化法,将聚偏氟乙烯(PVDF)、聚乙二醇(PEG)和二氧化钛(TiO2)共混制得光催化复合分离膜并对其进行扫描电子显微镜(SEM)、原子力显微镜(AFM)和X射线能谱仪(EDS)等相应的表征。比较了有无光照条件下,PVDF-PEG和PVDF-PEG-TiO2膜对腐殖酸(HA)的截留和超滤过程中的膜污染情况。研究结果表明,TiO2光催化复合分离膜能提高对水中天然有机物的去除并同时降低膜污染。紫外光照强度越强,PVDF-PEG-TiO2膜的抗污染性能越好。另外,光催化能更有效地减少超滤初始浓度较低的腐殖酸溶液过程中的膜通量衰减。 相似文献
944.
餐厨废弃物的不当处理,不但直接影响城市容貌、污染地下水、食品安全及人们身体健康,同时造成巨大的资源浪费.餐厨废弃物的处理已经成为政府及社会广为关注的重大问题.介绍了餐厨废弃物处置管理的意义,分析了目前几种生物处理技术的现状,提出了利用环境昆虫进行餐厨废弃物资源化利用的有关建议. 相似文献
945.
将碳纳米管固定化制成多孔疏水性导电薄膜构建电化学阴极还原体系,实现过氧化氢在阴极的原位产生。电极特性研究表明,电极在较宽的电压范围内均具有较好的活性。考察了阴极电位、电极成分、氧气流量和电解质浓度对过氧化氢原位产生的影响,在优化条件下经过120min后过氧化氢达到66.17mg/L,并探讨过氧化氢原位产生的机理。在此基础上考察原位过氧化氢氧化工艺下对亚甲基蓝的脱色效果,并分析其脱色机理。 相似文献
946.
以旋转填充床(RPB)作为反应装置,研究了Fenton工艺与Fenton+O3工艺处理模拟阿莫西林废水的效果,考察了FeSO4·7H2O的投加量、温度、旋转床转速、液体流量及pH对COD去除率的影响。实验表明,Fenton+O3工艺的COD脱除率及BOD5/COD相对于Fenton工艺分别提升26.7%和140%。该工艺在pH为3、温度为25℃、液体流量30 L/h、气体流量2.5 L/h、转速800 r/min、H2O2的投加量为1 mmol/L及Fe2+投加量为0.4 mmol/L的条件下,100 mg/L的模拟阿莫西林废水中COD的去除率达到57.9%,BOD5/COD从0增加到0.36,满足后续生化处理要求。 相似文献
947.
以模拟啤酒废水为底物在IC反应器中进行厌氧污泥颗粒化培养,并对污泥颗粒化过程中胞外多聚物(EPS)的主要成分变化及其与细胞表面疏水性和Zeta电位之间的相互关系进行分析,以此来阐述EPS对污泥颗粒化成核的作用。研究结果表明,好氧剩余污泥在经过56 d的培养后,平均粒径由接种时的54.72μm增长到103.46μm,实现了厌氧污泥颗粒化成核过程;EPS蛋白质含量(PN)在颗粒化过程中逐渐由接种时的18.1 mg/g增至54.3 mg/g,而EPS多糖含量(PS)则无明显变化;此外,PN/PS与污泥平均粒径、细胞表面疏水性(RH)以及Zeta电位之间呈正相关关系,相关系数分别为0.9727、0.9593和0.9274。由此可推测:厌氧污泥颗粒化成核过程的主要作用成分为胞外蛋白质,其可以改变污泥细胞表面疏水性和Zeta电位,从而在厌氧污泥颗粒化过程中有着重要的促进作用。 相似文献
948.
Nutrient retention in plant biomass and sediments from the salt marsh in Hangzhou Bay estuary, China 总被引:1,自引:0,他引:1
Xuexin Shao Ming Wu Binhe Gu Yinxu Chen Xinqiang Liang 《Environmental science and pollution research international》2013,20(9):6382-6391
Nutrient load into the ocean can be retained during the process of plant uptake and sedimentation in marshes along the bay zone. Seasonal variations of biomass and nutrient concentration in three dominated plant assemblages and associated sediments were monitored in this study area to determine effects of salt marsh on nutrient retention. Results showed that plant aboveground biomass displayed a unimodal curve with nutrient concentration generally decreased from spring to winter. Belowground biomass was relatively low during the rapid growth period with nutrient concentration tending to decrease and then increase during this period. Plant total nitrogen (TN) pools are higher than total phosphorus (TP) pools, and both pools showed significant seasonal variations. Water purification coefficients (WPC) of nutrients by plant assimilation were 34.4/17.3, 19.3/24.0, and 5.14/6.04 t/(m2 year) (TN/TP) for Phragmites australis, Spartina alterniflora, and Scirpus mariqueter, respectively. Overall, these results suggest that higher annual plant biomass and nutrient assimilation contribute to greater nutrient retention capacity and accumulation in sediments, thereby enabling reduced eutrophication in transitional waters. 相似文献
949.
950.