全文获取类型
收费全文 | 264篇 |
免费 | 24篇 |
国内免费 | 71篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 47篇 |
环保管理 | 20篇 |
综合类 | 152篇 |
基础理论 | 22篇 |
污染及防治 | 78篇 |
评价与监测 | 24篇 |
出版年
2023年 | 1篇 |
2021年 | 3篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 8篇 |
2014年 | 10篇 |
2013年 | 24篇 |
2012年 | 27篇 |
2011年 | 11篇 |
2010年 | 28篇 |
2009年 | 17篇 |
2008年 | 16篇 |
2007年 | 33篇 |
2006年 | 41篇 |
2005年 | 19篇 |
2004年 | 15篇 |
2003年 | 19篇 |
2002年 | 12篇 |
2001年 | 15篇 |
2000年 | 4篇 |
1999年 | 11篇 |
1998年 | 3篇 |
1997年 | 6篇 |
1996年 | 6篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1991年 | 1篇 |
排序方式: 共有359条查询结果,搜索用时 15 毫秒
61.
Selection of appropriate organic additives for enhancing Zn and Cd phytoextraction by hyperaccumulators 总被引:3,自引:0,他引:3
WU Qi-tang DENG Jin-chuan LONG Xin-xian MOREL Jean-louis SCHWARTZ Christophe 《环境科学学报(英文版)》2006,18(6):1113-1118
Chelant-enhanced phytoextraction is one of the most promising technologies to remove heavy metals from soil. The key of the technology is to choose suitable additives in combination with a suitable plant. In the present study, laboratory batch experiment of metal solubilization, cress seeds germination were undertaken to investigate the metal-mobilizing capability and the phytotoxicity of organic additives, including ethylene diamine triacetic acid (EDTA), citric acid, acetic acid, oxalic acid, glutamine and monosodium glutamate waste liquid (MGWL) from food industry. Experiments in pots were carried out to study the effects of the additives on Zn and Cd phytoextraction. Furthermore, a leaching experiment with lysimeter was performed to evaluate the environmental risks of additive-induced leaching to underground water. The results showed that EDTA had a strong mobilizing ability for Zn and Cd, followed by mixed reagent (MR) and MGWL. MGWL and acetic acid at 5 mmol equivalent per liter resulted in seed germination index less than 2%. Experiments in pots verified the phytotoxicity of acetic acid and MGWL. Addition of the mixed reagent at 6--10 mmol/kg significantly increased Zn phytoextraction by Thlaspi caerulescens. The same for EDTA and the mixed reagent at 10 mmol/kg by Sedum dfredii. But only mixed reagents could significantly increase Cd phytoextraction by the studied hyperaccumulators. This suggested that the strong chelant was not always the good agent to enhance phytoextraction. S. alfredii combined with 2--10 mmol/kg soil MR was preferred for phytoremediation of Cd/Zn contaminated soils in southern China, this could result in high phytoextraction of Cd/Zn and reduce the leaching risk to underground water than EDTA assisted phytoextration. 相似文献
62.
63.
Fenton试剂催化氧化降解微囊藻毒素的动力学研究 总被引:3,自引:0,他引:3
针对饮用水中藻毒素污染的问题,以微囊藻毒素作为研究对象,系统地研究了Fenton试剂催化氧化降解微囊藻毒素的效能,并对其催化氧化微囊藻毒素过程的反应动力学进行了探讨。实验结果表明,Fenton试剂对微囊藻毒素具有较好的催化氧化效果,当[H2O2]=8 g/L、[Fe2 ]/[H2O2]=1/12、pH=2时,反应在30 min内微囊藻毒素的去除率可达90%以上。同时通过实验得出了Fenton试剂催化氧化降解微囊藻毒素的动力学方程为:r=2.31×106exp[-23 300/(RT)]C0.H492O2C2.22M。 相似文献
64.
混凝-Fenton试剂氧化工艺处理机械厂洗涤废水 总被引:2,自引:0,他引:2
对某厂机械洗涤废水,采用混凝-Fenton试剂进行处理。结果表明,用聚铝(w(PAC)=5%)对废水进行絮凝沉淀,PAC最佳投加量为1.5 mL/L(废水),絮凝后的COD去除率为29.6%;芬顿试剂最佳操作条件为:n(H2O2)∶n(Fe2+)=5∶1,m(H2O2)∶m(COD)=2.5∶1,废水pH=5,温度为30℃,反应时间为2 h,经氧化后,COD的去除率为78.5%;经过混凝沉淀-芬顿氧化处理,COD的总去除率为84.9%,去除效果良好。 相似文献
65.
微电解-Fenton联合工艺预处理煤层气井压裂废水 总被引:1,自引:0,他引:1
利用Fenton强化微电解工艺对煤层气井压裂废水展开预处理研究,以COD去除率和可生化性(B/C)为考察指标,单独工艺正交实验结果表明pH为3、反应时间为90 min、铁碳体积比为1.5∶1和pH为4、反应时间为80 min、H2O2投加量为4 mL/L分别是微电解与Fenton反应的最优条件,各可获得48.1%和44.9%的COD去除率。在最优条件下进行微电解-Fenton联合运行实验,连续61 h内COD去除率均稳定在65%以上,B/C由0.158上升到0.3以上,有利于后续生化处理的运行。 相似文献
66.
采用Fenton试剂处理汽车油漆废渣。考察了FeSO_4用量、H_2O_2用量、反应温度、反应时间对处理效果的影响。实验结果表明,在FeSO_4用量为20.5 mg/g、H_2O_2用量为0.6 g/g、反应温度为80 ℃、反应时间为3 h的最优条件下,清漆渣、色漆渣、底漆渣3种漆渣的干基减量率均为20%左右,湿基减量率分别为67.9%、48.2%和64.2%,3种产物的脱水性能均有不同程度的提高,处理后废液的COD均为2 000 mg/L左右。采用Fenton试剂处理后的清漆渣产物粒径与原料相似,产物颗粒球形度高,表面粗糙,内部为多孔结构,产物作为固体燃料时燃烧更充分。Fenton试剂处理未对漆渣中的树脂主体产生较大的破坏。 相似文献
67.
68.
Sulfate removal from waste chemicals by precipitation 总被引:3,自引:0,他引:3
Chemical oxidation using Fenton's reagent has proven to be a viable alternative to the oxidative destruction of organic pollutants in mixed waste chemicals, but the sulfate concentration in the treated liquor was still above the acceptable limits for effluent discharge. In this paper, the feasibility of sulfate removal from complex laboratory wastewaters using barium and calcium precipitation was investigated. The process was applied to different wastewater cases (two composite samples generated in different periods) in order to study the effect of the wastewater composition on the sulfate precipitation. The experiments were performed with raw and oxidized wastewater samples, and carried out according to the following steps: (1) evaluate the pH effect upon sulfate precipitation on raw wastewaters at pH range of 2-8; (2) conduct sulfate precipitation experiments on raw and oxidized wastewaters; and (3) characterize the precipitate yielded. At a concentration of 80 g L(-1), barium precipitation achieved a sulfate removal up to 61.4% while calcium precipitation provided over 99% sulfate removal in raw and oxidized wastewaters and for both samples. Calcium precipitation was chosen to be performed after Fenton's oxidation; hence this process configuration favors the production of higher quality precipitates. The results showed that, when dried at 105 degrees C, the precipitate is composed of hemidrate and anhydrous calcium sulfate ( approximately 99.8%) and trace metals ( approximately 0.2%: Fe, Cr, Mn, Co, Ag, Mg, K, Na), what makes it suitable for reuse in innumerous processes. 相似文献
69.
70.