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941.
This paper summarizes the results of a degradation test of bromopyrogallol red (BPR) and textile dye wastewater (TDW) with a conventional three-electrode potentiostatic system in the presence of cobalt ions (electro Co(2+)-H2O2 system). H2O2, produced by the two-electron reduction of O2 at the cathode, would react with Co2+ ions, leading to the generation of hydroxyl radicals (*OH), which caused the degradation of the organic pollutants. With BPR degradation process as the reference point, the optimal conditions (pH=4.0 and the concentration of Co2+ is 0.1 mM) and the treating capacity of the system were both studied and compared with electro-Fenton's reagent. Many benefits were shown by the electro Co(2+)-H2O2 system, such as less metal ions consumption, more moderate conditions and faster reaction process. Treated with the system for 0.5 h, chemical oxygen demand and biological oxygen demand of TDW (pH=5.2), without pH adjustment, were reduced by 95.7% and 92.7%, respectively. These characteristics make the method another appropriate solution for wastewater treatment, especially for those contaminated by organic pollutants. 相似文献
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943.
我国正在研制专用于销毁高浓度多氯联苯(PCBs)的焚烧炉,主要处理废旧的含(PCBs)的电力电容器和变压器,应用可靠准确的监测方法测定了试验性焚烧炉渣、烟灰排气和废水中的二口恶口英(dioxins),类二口恶口英多氯联苯(dioxinlikePCBs)和PCBs含量,结果表明该炉试烧高浓度PCBs时,焚毁率可以达到99.9999%,炉渣中的2,3,7,8TCDD毒性当量为87.86pgTEQ/g,烟灰中残留二口恶口英和类二口恶口英的总2,3,7,8TCDD毒性当量为47.23ngTEQ/g. 相似文献
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945.
Quantitative tolerance values for common stream benthic macroinvertebrates in the Yangtze River Delta,Eastern China 总被引:5,自引:0,他引:5
Chun-Yan Qin Jin Zhou Yong Cao Yong Zhang Robert M. Hughes Bei-Xin Wang 《Environmental monitoring and assessment》2014,186(9):5883-5895
Aquatic organisms’ tolerance to water pollution is widely used to monitor and assess freshwater ecosystem health. Tolerance values (TVs) estimated based on statistical analyses of species-environment relationships are more objective than those assigned by expert opinion. Region-specific TVs are the basis for developing accurate bioassessment metrics particularly in developing countries, where both aquatic biota and their responses to human disturbances have been poorly documented. We used principal component analysis to derive a synthetic gradient for four stressor variables (total nitrogen, total phosphorus, dissolved oxygen, and % silt) based on 286 sampling sites in the Taihu Lake and Qiantang River basins (Yangtze River Delta), China. We used the scores of taxa on the first principal component (PC1), which explained 49.8 % of the variance, to estimate the tolerance values (TVr) of 163 macroinvertebrates taxa that were collected from at least 20 sites, 81 of which were not included in the Hilsenhoff TV lists (TVh) of 1987. All estimates were scaled into the range of 1–10 as in TVh. Of all the taxa with different TVs, 46.3 % of TVr were lower and 52.4 % were higher than TVh. TVr were significantly (p?<?0.01, Fig. 2), but weakly (r 2?=?0.34), correlated with TVh. Seven biotic metrics based on TVr were more strongly correlated with the main stressors and were more effective at discriminating references sites from impacted sites than those based on TVh. Our results highlight the importance of developing region-specific TVs for macroinvertebrate-based bioassessment and to facilitate assessment of streams in China, particularly in the Yangtze River Delta. 相似文献
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Jinjin Fu Quan Zhang Baocheng Huang Niansi Fan Rencun Jin 《Frontiers of Environmental Science & Engineering》2021,15(1):17
950.
Hydrophobic organic contaminants (HOCs)—pyrene, and natural organic matters (NOM) from different sources were taken as the test compounds to investigate the impact of physicochemical characteristics of NOM on HOCs’ partition to the NOM in this study. The effects of solution property, NOM characteristics, and modification by ozone preoxidation on pyrene partition to NOM were systematically evaluated. According to the fluorescence quenching method, the partition coefficient K oc of pyrene to NOM was calculated, which was found to have a great relationship with the aromatic structures and hydrophobic functional groups of the NOM. The NOM characteristic modification corresponding to solution property could influence the interactions between the NOM and pyrene. Preozonation could destroy the aromatic or hydrophobic structures of the NOM and decrease K oc of pyrene. 相似文献