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91.
Bioaccumulation and physiological effects of excess lead in a roadside pioneer species Sonchus oleraceus L 总被引:2,自引:0,他引:2
Xiong ZT 《Environmental pollution (Barking, Essex : 1987)》1997,97(3):275-279
Seedlings of Sonchus oleraceus L. were transplanted to soil supplied with lead acetate at dosages of 0, 800, 1600 and 3200 mg kg(-1) DW. Measures of chlorophyll content, peroxidase (POD) activity, shoot length, biomass and Pb content in the plant tissues were obtained from the experimental plants. With increasing amounts of Pb in the soil, the chlorophyll content, shoot length and biomass decreased, while POD activity and Pb content in the plant tissues increased. At 3200 mg kg(-1) Pb treatment, Pb content in the plant leaf, stem and root were 65.67, 149.82 and 1113.24 mg kg(-1), respectively. Only at 3200 mg kg(-1) Pb treatment did chlorophyll content, shoot length and biomass significantly increase by 18, 15 and 44%, respectively, while POD decreased by 39% over the control. The potential of applying this species in phytoremediation of Pb contaminated roadside soils and thus restoration of the roadside vegetation are discussed. 相似文献
92.
Determination of polycyclic musks in sewage sludge from Guangdong, China using GC-EI-MS 总被引:12,自引:0,他引:12
Polycyclic musks [Cashmeran (DPMI), Celestolide (ADBI), Phantolide (AHMI), Traseolide (ATII), Tonalide (AHTN) and Galaxolide (HHCB)] were Soxhlet extracted, separated and analyzed in sewage sludge from six different wastewater treatment plants from Guangdong, China, using GC and GC-EI-MS. DPMI, ADBI, HHCB, AHTN were found in all samples, and ATII was not found in any sample. AHMI was detected in five out of six samples. HHCB and AHTN were the two major polycyclic musks found in highest concentrations in sludge. The sludge from municipal wastewater treatment plants contained HHCB, AHTN and DPMI at concentrations between 5.416 and 21.214, 0.715 and 6.195 and 0.599 and 2.870 mg/kg (dry), respectively. The highest concentration was found in sludge from one cosmetic plant at 703.681 mg HHCB/kg (dry). The results indicate that there are two sources of polycyclic musks: domestic sewage and industrial wastewater. 相似文献
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印刷线路板废弃物的热解与动力学实验研究 总被引:2,自引:0,他引:2
分别应用管式炉反应器和热重分析手段对印刷线路板废弃物的热解行为和热解动力学进行了实验研究。在管式炉中,研究不同的热解温度:700~950℃,对产物分布和气体成分分布的影响。实验结果表明:PCB热解气体的主要成分是H2和CO2,气体的热值较低,仅为2.09~5.41MJ/m^3,PCB不适合以气体产物为目标的能源利用方式。应用Friedman方法对PCB的热解动力学进行了研究,求得PCB的热解动力学参数分别是:表观活化能190.92kJ/mol,反应级数5.97,指前因子lnA47.14min^-1。 相似文献
95.
Zhao Chenxu Lin Xiaojuan Ji Feng Xiong Ping Liu Yao Wang Suting Chen Peng Xu Qing Zhang Li Tao Zexin Xu Aiqiang 《Food and environmental virology》2020,12(4):321-332
Food and Environmental Virology - We present the results of environmental surveillance for poliovirus (PV) and non-poliovirus (NPEV) around the switch from trivalent to bivalent oral polio-vaccine... 相似文献
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利用“生物接触氧化+植物”一体化装置处理城镇污水,试验最终选用悬浮多面球作填料,采用射流曝气,控制进水流量为0.45 m3/h,进水浓度为COD 63~467 mg/L、NH3-N 11.21~52.7 mg/L、TN 28.6 ~63.5mg/L和TP 1.1~6.42 mg/L时,COD、NH3-N、TN和TP的去除率分别达到88%、86%、70%、60%以上,出水COD≤30 mg/L,NH3-N≤5 mg/L、TN≤13 mg/L、TP≤0.5 mg/L.水质优于《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准,具有较好的工程应用前景. 相似文献
99.
TianTian Xiong Annabelle Austruy Antoine Pierart Muhammad Shahi Eva Schreck Stéphane Mombo Camille Dumat 《环境科学学报(英文版)》2016,28(8):16-27
At the global scale, foliar metal transfer occurs for consumed vegetables cultivated in numerous urban or industrial areas with a polluted atmosphere. However, the kinetics of metal uptake, translocation and involved phytotoxicity was never jointly studied with vegetables exposed to micronic and sub-micronic particles (PM). Different leafy vegetables (lettuces and cabbages) cultivated in RHIZOtest® devices were, therefore, exposed in a greenhouse for 5, 10 and 15 days to various PbO PM doses. The kinetics of transfer and phytotoxicity was assessed in relation to lead concentration and exposure duration. A significant Pb accumulation in leaves (up to 7392 mg/kg dry weight (DW) in lettuce) with translocation to roots was observed. Lead foliar exposure resulted in significant phytotoxicity, lipid composition change, a decrease of plant shoot growth (up to 68.2% in lettuce) and net photosynthesis (up to 58% in lettuce). The phytotoxicity results indicated plant adaptation to Pb and a higher sensitivity of lettuce in comparison with cabbage. Air quality needs, therefore, to be considered for the health and quality of vegetables grown in polluted areas, such as certain megacities (in China, Pakistan, Europe, etc.) and furthermore, to assess the health risks associated with their consumption. 相似文献
100.
Tonggang Shen Hanchang Shi Huiming Shi He Jing Huilei Xiong 《Frontiers of Environmental Science & Engineering in China》2011,5(1):130-139
To improve the efficiency of nitrogen removal with lower energy consumption, the study of feedforward control was carried
out on a pilot-scale anaerobic-anoxicoxic (AAO) plant for the treatment of municipal wastewater. The effluent qualities of
the pilot plant under different control strategies were investigated. The results indicated that the change of external recycle
was not a suitable approach to regulate the sludge concentration of plug-flow reactors; adjusting the aeration valve and dissolved
oxygen set-point according to ammonia load could overcome the impact of influent fluctuation; and the denitrification potential
could be estimated based on the transit time of anoxic zone and the relative content of carbon resource entering the anoxic
zone. Simple feedforward control strategies for aeration and internal recycle were subsequently proposed and validated. The
nitrogen removal was successfully improved in the pilot plant. The effluent total nitrogen had decreased by 29.9% and was
steadily controlled below 15 mg·L−1. Furthermore, approximately 38% of the energy for aeration had been saved. 相似文献