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71.
72.
73.
2种改良土壤渗滤系统对降雨径流中氮的去除 总被引:1,自引:0,他引:1
为研究改良土壤渗滤系统对降雨径流中不同形态氮(NH+4-N,NO-3-N,NO-2-N,TN)的去除效果及径流中氮负荷对氮去除率的影响,实验分别以聚氨酯泡沫和人工草皮为改良材料,以降雨径流中的氮为处理对象进行室内模拟研究。结果表明,聚氨酯泡沫土壤渗滤系统及草皮土壤渗滤系统对TN,NH+4-N均具有较好的净化效果,并表现出良好的耐冲击负荷能力。TN平均去除率分别为72.65%和71.07%,NH+4-N平均去除率分别为98.10%和99.09%。2种渗滤系统对NO-3-N去除效果均较差,表现为-420.07%和-171.66%的负去除率。聚氨酯泡沫土壤渗滤系统对NO-2-N的平均去除率为87.29%,高于草皮土壤渗滤系统53.77%的平均去除率。总体上,聚氨酯泡沫土壤渗滤系统对径流中氮的去除效果优于草皮土壤渗滤系统,具有较好的应用前景。 相似文献
74.
Dou Zhang Zhiwei Li Jiguo Qiu Shanshan Zhou 《Journal of environmental science and health. Part. B》2016,51(10):688-694
A new species of Rhodococcus, designated strain MZ-3, which could degrade acetochlor efficiently were isolated and identified. The isolate could degrade and utilize acetochlor as the sole source of carbon, nitrogen, and energy for growth. The optimal conditions for the degradation and growth of MZ-3 were pH 7.0 and 30°C. Under these conditions, this strain could completely degrade 200 mg/L of acetochlor within 12 h of incubation. During the biodegradation process, the enantioselectivity of the strain was investigated using a chiral high-performance liquid chromatography (HPLC) system. However, no obvious enantioselectivities were found. 2-chloro-N-(2-methyl-6-ethylphenyl) acetamide (CMEPA) was detected as the intermediate using liquid chromatography-mass spectrometry (LC-MS) analyses. Our results suggest that strain MZ-3 might be a promising microorganism for the bioremediation of acetochlor-contaminated environments because of its acetochlor-degrading performance. 相似文献
75.
研究以SBBR为对象,考察碳源种类对原位生物解偶联污泥减量系统污泥产率和污水处理效能的影响。研究结果表明,在水温为25℃,挂膜密度为45%,负荷为4.0 kg COD/(m3填料·d),供气量为150 L/h,采用间歇曝气30 min/停曝30 min的方波供氧条件下,碳源种类对原位生物解偶联污泥减量系统效能影响显著。当进水有机质为葡萄糖时,系统污泥产率最小,为0.0292 kg MLSS/kg COD,分别比进水碳源为粪水、乙酸钠、淀粉时减少19.4%、64.8%和99.9%。碳源为葡萄糖时,系统出水COD、NH+4-N、TN分别为41、6.4和17.3 mg/L,可达标排放。 相似文献
76.
Ming Dou Qiting Zuo Jinping Zhang Congying Li Guiqiu Li 《Environmental monitoring and assessment》2013,185(9):7501-7516
With rapid economic development, the Pearl River Delta (PRD) of China has experienced a series of serious heavy metal pollution events. Considering complex hydrodynamic and pollutants transport process, one-dimensional hydrodynamic model and heavy metal transport model were developed for tidal river network of the PRD. Then, several pollution emergency scenarios were designed by combining with the upper inflow, water quality and the lower tide level boundary conditions. Using this set of models, the temporal and spatial change process of cadmium (Cd) concentration was simulated. The influence of change in hydrodynamic conditions on Cd transport in tidal river network was assessed, and its transport laws were summarized. The result showed the following: Flow changes in the tidal river network were influenced remarkably by tidal backwater action, which further influenced the transport process of heavy metals; Cd concentrations in most sections while encountering high tide were far greater than those while encountering middle or low tides; and increased inflows from upper reaches could intensify water pollution in the West River (while encountering high tide) or the North River (while encountering middle or low tides). 相似文献
77.
仪征市可持续发展指标体系研究 总被引:16,自引:0,他引:16
本文采用了隶属度函数及可持续发展的阶段连续性方程,建立了评价可持续发展的复合指标体系,给出了持续发展的水平及揭示了不同时态持续发展的类型,并以此为基础分析了仪征市近,无期的可持续发展状况,提出了调控的措施。 相似文献
78.
随着北京城市建设的发展,为了保护环境,北京市的新建生活区均采用集中供热系统。燃烧后的有害气体通过烟排向大气,经过高空稀释后的烟气可以降低污染负荷,但是在某此气象条件下仍然造成了地面局部污染,本文在北京市丰台区一个生活小区的供热系统污染源环境影响评价的基础上,讨论了熏烟污染的发生及危害。 相似文献
79.
根据我国大气环境质量标准,参照美国,日本等国对居住区的污染物容许浓度,提出了佛山市南海狮中垃圾卫生填埋卫生防护距离标准的建议值。 相似文献
80.
Dou Junfeng Luo Guyuan Liu Xiang 《Frontiers of Environmental Science & Engineering in China》2007,1(2):233-239
Enhanced biological phosphorus removal (EBPR) is a commonly used and sustainable method for phosphorus removal from wastewater.
Poly-β-hydroxybutyrate (PHB), polyphosphate, and glycogen are three kinds of intracellular storage polymers in phosphorus accumulation
organisms. The variation of these polymers under different conditions has an apparent influence on anaerobic phosphorus release,
which is very important for controlling the performance of EBPR. To obtain the mechanism and kinetic character of anaerobic
phosphorus release, a series of batch experiments were performed using the excessively aerated sludge from the aerobic unit
of the biological phosphorus removal system in this study. The results showed that the volatile suspended solid (VSS) had
an increasing trend, while the mixed liquid suspended sludge (MLSS) and ashes were reduced during the anaerobic phosphorus
release process. The interruption of anaerobic HAc-uptake and phosphorus-release occurs when the glycogen in the phosphorus-accumulating-organisms
is exhausted. Under the condition of lower initial HAc-COD, HAc became the limiting factor after some time for anaerobic HAc
uptake. Under the condition of higher initial HAc-COD, HAc uptake was stopped because of the depletion of glycogen in the
microorganisms. The mean ratio of Δρ
P/Δρ
PHB, Δρ
GLY/Δρ
PHB, Δρ
P/ΔCOD, was 0.48, 0.50, 0.44, and 0.92, respectively, which was nearly the same as the theoretical value. The calibrated kinetic
parameters of the HAc-uptake and phosphorus-release model were evaluated as follows: Q
HAc,max was 164 mg/(g · h), Q
P,max was 69.9 mg/(g · h), K
gly was 0.005, and KCOD was 3 mg/L. An apparently linear correlation was observed between the ratio of Δρ
P/ΔCOD and pH of the solution, and the equation between them was obtained in this study.
Translated from Acta Scientiae Circumstantiae, 2005, 25(9), 1164–1169 [译自: 环境科学学报] 相似文献