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排序方式: 共有55条查询结果,搜索用时 31 毫秒
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Suarez-Ojeda ME Guisasola A Baeza JA Fabregat A Stüber F Fortuny A Font J Carrera J 《Chemosphere》2007,66(11):2096-2105
This study examines the feasibility of coupling a Catalytic Wet Air Oxidation (CWAO), with activated carbon (AC) as catalyst, and an aerobic biological treatment to treat a high-strength o-cresol wastewater. Two goals are pursued: (a) To determine the effect of the main AC/CWAO intermediates on the activated sludge of a municipal WasteWater Treatment Plant (WWTP) and (b) To demonstrate the feasibility of coupling the AC/CWAO effluent as a part of the influent of a municipal WWTP. In a previous study, a high-strength o-cresol wastewater was treated by AC/CWAO aiming to establish the distribution of intermediates and the biodegradability enhancement. In this work, the biodegradability, toxicity and inhibition of the most relevant intermediates detected in the AC/CWAO effluent were determined by respirometry. Also, the results of a pilot scale municipal WWTP study for an integrated AC/CWAO-aerobic biological treatment of this effluent are presented. The biodegradation parameters (i.e. maximum oxygen uptake rate and oxygen consumption) of main AC/CWAO intermediates allowed the classification of the intermediates into readily biodegradable, inert or toxic/inhibitory compounds. This detailed study, allowed to understand the biodegradability enhancement exhibited by an AC/CWAO effluent and to achieve a successful strategy for coupling the AC/CWAO step with an aerobic biological treatment for a high-strength o-cresol wastewater. Using 30%, as COD, of AC/CWAO effluent in the inlet to the pilot scale WWTP, the integrated AC/CWAO-biological treatment achieved a 98% of total COD removal and, particularly, a 91% of AC/CWAO effluent COD removal without any undesirable effect on the biomass. 相似文献
3.
J.N. Louvet 《Environmental pollution (Barking, Essex : 1987)》2010,158(3):688-693
This study examines the effects of erythromycin on activated sludge from two French urban wastewater treatment plants (WWTPs). Wastewater spiked with 10 mg/L erythromycin inhibited the specific evolution rate of chemical oxygen demand (COD) by 79% (standard deviation 34%) and the specific N-NH4+ evolution rate by 41% (standard deviation 25%). A temporary increase in COD and tryptophan-like fluorescence, as well as a decrease in suspended solids, were observed in reactors with wastewater containing erythromycin. The destruction of activated sludge flocs was monitored by automated image analysis. The effect of erythromycin on nitrification was variable depending on the sludge origin. Erythromycin inhibited the specific nitrification rate in sludge from one WWTP, but increased the nitrification rate at the other facility. 相似文献
4.
In this work, vinyltriethoxysilane (A151) and 3-aminopropyltriethoxysilane (KH550) were used to modify ammonium polyphosphate (APP), showing that the dispersibility of APP could be improved remarkably by A151 and KH550. The maximum explosion pressure of aluminum dust explosion decreased with the addition of APP, A151-APP (APP-A) and KH550-APP (APP-B), with the exception of the case where the inerting ratio (α) of APP-A was less than 0.4. After the addition of APP-B, there was little difference in flame propagation behavior and explosion pressure compared with that of adding APP, indicating that APP-B could retain the inhibition performance of APP compared with APP-A. When the inerting ratios of APP, APP-A and APP-B were 1.2, 1.4 and 1.4, respectively, the aluminum dust explosion could be completely inhibited. The explosion residues of aluminum dust/APP mainly consisted of Al2O3, P-containing and N-containing compounds. It could be analyzed that APP exerted the inhibition effect through both chemical and physical effects. 相似文献
5.
Cell biosensors are currently emerging as novel, sensitive techniques to monitor the toxicity of environmental pollutants.
Here, we have developed electric cell-substrate impedance sensing (ECIS) for on-line monitoring of the behavior of insect
cells. Cells were cultured on a microarray of eight small gold electrodes, deposited on the bottom of tissue culture wells.
Upon inoculation, cells showed a tendency to drift downward and attached to the gold surface precoated with the protein Concanavalin
A to accelerate the cell attachment. The impedance increased because the cells acted as insulating particles to restrict the
current flow. The resulting impedance, a coordination of many biological reactions within the cell, was continuously monitored
in real-time to reveal information about cell spreading and micromotion. As the cell behavior was sensitive to external chemicals,
the applicability of ECIS for inhibition assays was demonstrated with HgCl2, 2,4,6-trinitrotoluene (TNT), 2-amino 4,6-dinitrotoluene (2-ADNT) and 1,3,5-trinitrobenzene (TNB).
Electronic Publication 相似文献
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Tao Liu Yudong Song Zhiqiang Shen Yuexi Zhou 《Frontiers of Environmental Science & Engineering》2021,15(6):119
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通惠河水质毒性监测与评价 总被引:3,自引:0,他引:3
采用分析水质理化指标,大型溲运动及生存抑制试验和蚕豆在微核试验,对通惠河水进行监测,并结合现场调查,评价通惠河水污染状况。表明,通惠河水污染较重,并具有一定遗传毒性。 相似文献
10.
Two inhibitors, triethanolamine (TEA) and monoethanolamine (MEA), were tested for their ability to prevent the de novo formation
of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) on sinter plant fly ash. The amounts of both PCDDs and PCDFs, formed
by thermal treatment of the fly ash, decreased when inhibitors were added. Up to 90% reduction of the PCDD/Fs formation was
reached when 2 wt % monoethanolamine was mixed with fly ash. The temperatures tested, 325 and 400 °C, did not affect the inhibition
activity. However, a longer reaction time, 4 h instead of 2 h, gave higher percentages of PCDD/Fs reduction. The laboratory
results show that ethanolamines reduce the dioxins formation on sinter plant fly ash under various conditions of temperature
and reaction time. Moreover, factory tests performed in parallel at a sinter plant are in good agreement with the laboratory
experiments, thus confirming that the use of ethanolamine inhibitors is an appropriate technique for the prevention of dioxins
emissions from sintering processes.
Electronic Publication 相似文献