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991.
Weilong Ouyang Yi Zhou Xiaoqi Fei Yarong Bai Haiqiang Wang Zhongbiao Wu 《环境科学学报(英文版)》2022,34(1):175-184
Herein, a series of niobium oxide supported cerium nanotubes(Ce NTs) catalysts with different loading amount of Nb2O5(0–10 wt.%) were prepared and used for selective catalytic reduction of NOxwith NH3(NH3-SCR) in the presence of CH2Cl2. Commercial V2O5-WO3-TiO2 catalyst was also prepared for comparison. The physcial properties and chemical properties of the Nb2O5 lo... 相似文献
992.
993.
Jing Bai Huijun Yao Maosheng Lin Lina Zhang Fuan Lei Xiaofei Li Junsheng Guo 《Journal of environmental radioactivity》2010,101(11):969-973
The present paper reports the biosorption of uranium onto chemically modified yeast cells, Rhodotorula glutinis, in order to study the role played by various functional groups in the cell wall. Esterification of the carboxyl groups and methylation of the amino groups present in the cells were carried out by methanol and formaldehyde treatment, respectively. The uranium sorption capacity increased 31% for the methanol-treated biomass and 11% for the formaldehyde-treated biomass at an initial uranium concentration of 140 mg/L. The enhancement of uranium sorption capacity was investigated by Fourier transform infrared (FTIR) spectroscopy analysis, with amino and carboxyl groups were determined to be the important functional groups involved in uranium binding. The biosorption isotherms of uranium onto the raw and chemically modified biomass were also investigated with varying uranium concentrations. Langmuir and Freundlich models were well able to explain the sorption equilibrium data with satisfactory correlation coefficients higher than 0.9. 相似文献
994.
995.
Pre-oxidation is widely used to reduce ultrafiltration membrane fouling.However,the variation in the composition of microbial communities and extracellular polymeric substances(EPSs) accompanying pre-oxidation in drinking water treatment has received little attention.In this study,hydrogen peroxide(H_2O_2) was used in a coagulationultrafiltration process with Al_2(SO_4)_3·18H_2O.A long-term reactor experiment(60 d) showed that pre-oxidation alleviated membrane fouling,mainly due to its inhibition of microbial growth,as observed by flow cytometry measurements of the membrane tank water.Further analysis of the formed cake layer demonstrated that the corresponding levels of EPS released from the microbes were lower with than without H_2O_2 treatment.In comparison to polysaccharides,proteins dominated the EPS.2 D-electrophoresis showed little difference(p 0.05,Student's t-test) in the composition of proteins in the cake layer between the treatments with and without H_2O_2.The molecular weights of proteins ranged from approximately 30–50 kDa and the majority of isoelectric points ranged from 6 to 8.Highthroughput sequencing showed that the predominant bacteria were Proteobacteria,Bacteroidetes,and Verrucomicrobia in both cake layers.However,the relative abundance of Planctomycetes was higher in the cake layer with H_2O_2 pre-oxidation,which was likely probably due to the strong oxidative resistance of its cell wall.Overall,our findings clarify the fundamental molecular mechanism in H_2O_2 pre-oxidation for ultrafiltration membrane bio-fouling alleviation in drinking water treatment. 相似文献
996.
Haonan Fan Shanghua Wu John Woodley Guoqiang Zhuang Zhihui Bai Shengjun Xu Xuan Wang Xuliang Zhuang 《环境科学学报(英文版)》2020,32(3):277-286
As a major reservoir of antibiotics, animal manure contributes a lot to the augmented environmental pressure of antibiotic resistance genes (ARGs). This might be the first study to explore the effects of different ventilation types on the control of ARGs and to identify the relationships between archaeal communities and ARGs during the composting of dairy manure. Several ARGs were quantified via Real-time qPCR and microbial communities including bacteria and archaea were analyzed by High-throughput sequencing during vacuum-type composting (VTC) and positive-pressure composting (PPC). The total detected ARGs and class I integrase gene (intI1) under VTC were significantly lower than that under PPC during each stage of the composting (p < 0.001). The relative abundance of potential human pathogenic bacteria (HPB) which were identified based on sequencing information and correlation analysis decreased by 74.6% and 91.4% at the end of PPC and VTC, respectively. The composition of archaeal communities indicated that methane-producing archaea including Methanobrevibacter, Methanocorpusculum and Methanosphaera were dominant throughout the composting. Redundancy analysis suggested that Methanobrevibacter and Methanocorpusculum were positively correlated with all of the detected ARGs. Network analysis determined that the possible hosts of ARGs were different under VTC and PPC, and provided new sights about potential links between archaea and ARGs. Our results showed better performance of VTC in reducing ARGs and potential HPB and demonstrated that some archaea could also be influential hosts of ARGs, and caution the risks of archaea carrying ARGs. 相似文献
997.
Lanhe Zhang Jing Zheng Shulei Tian Haifeng Zhang Xiaohui Guan Suiyi Zhu Xiaoyu Zhang Yuxuan Bai Ping Xu Jian Zhang Zheng Li 《环境科学学报(英文版)》2020,32(5):212-221
The aluminum ions generated from mining aluminum,electrolytic aluminum and the industrial production of aluminum-based coagulants(such as AlCl_3 and Al_2(SO_4)_3) enter sewage treatment plants and interact with activated sludges.An anaerobic/anoxic/oxic(A~2 O) process was used to reveal the effects of Al~(3+) on the pollutant removal efficiencies,bioflocculation and the micro structure of sludge.The results showed that a low concentration of Al~(3+) improved the pollutant removal efficiencies and increased the sludge particle size.However,a high concentration of Al~(3+) hindered microbial flocculation and reduced the pollutant removal efficiencies.With a 10 mg/L Al~(3+) addition,the chemical oxygen demand(COD),total nitrogen(TN) and NH_4~+-N increased by 3%,16% and 27%,and reached as high as 68%,60% and 87%,respectively.At the same time,the dehydrogenase activity,flocculation ability(FA) and contact angle of the sludge reached their maximum levels at 41.3 mg/L/hr,45% and 79.63°,respectively.The specific surface area of the sludge decreased to 7.084 m2/g and the sludge pore size distribution shifted to concentrate in the me soporous range.Most of Al~(3+) was adsorbed on the surface of sludge,changing the physicochemical properties and physical structure of the sludge. 相似文献
998.
999.
废水中微量残留炸药奥克托今、黑索今测定方法的研究 总被引:1,自引:0,他引:1
含有奥克托今、黑索今的废水会对人体、动物、水生生物产生毒害作用。笔者针对含有奥克托今、黑索今的废水 ,研究了采用分光光度法同时测定废水中微量奥克托今、黑索今的原理、方法和显色反应的适宜条件。该方法不需要吸收曲线交点和等吸收点 ,具有较好的回归稳定性。采用该方法进行废水的环境监测 ,对环境治理、水质安全评价和水生生态进行综合的管理和保护将会发挥其重要作用。 相似文献
1000.
柏永全 《中国环境管理干部学院学报》2003,13(3):11-13
温室效应与气候变暖是深刻影响人类社会发展、人类生存而亟待解决的首要环境问题。在广泛调研的的基础上,从生态可持续发展角度对其进行了阐述。介绍了生态可持续发展理论、环境污染问题的严重性与全球性、近30年的地球异常气候而产生的各种恶性自然灾害、温室效应的产生和发展趋势及温室效应的防治对策。指出温室效应的防治要以生态可持续发展为着眼点,开发利用无污染能源,保护森林、增加植被,研究温室气体回收技术及不产生温室效应的原材料。 相似文献