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41.
武钢三烧区域改建了二台大连三洋蒸汽型双效溴化锂吸收式制冷机。叙述了该改建项目的主机选型、参数选定、设计特点等。 相似文献
42.
介绍了目前MBR的主要类型、膜污染情况、膜清洗方式以及MBR在不同领域的应用情况和工程实例,对MBR技术未来的发展趋势进行了预测。 相似文献
43.
通过对冷轧厂乳化液(含油)废水处理方法的对比,说明处理该废水采用无机陶瓷膜处理装置完全可行;介绍了无机陶瓷膜处理冷轧厂乳化液(含油)废水的工艺过程及处理系统组成。 相似文献
44.
摘要以镁盐、铝盐、纯碱和烧碱为原料制备了一种多孔镁铝复合氧化物(P—Mg3.1AlO4.6),其比表面积、平均孔径和总孔容分别为206.3m2/g、8.961nm和0.4208cm3/g。研究了这种多孑L材料对水溶液中cr(VI)的吸附性能,在25~45qC时,静态吸附量为82.32~141.7mg/g;当初始浓度100mg/L、流速5mL/min、床层高度10cm和pH=6时,半穿透时间、半穿透吸附量和饱和吸附量分别为406rain、49.28ing/g和51.30Ing/g;拟合参数及误差分析表明,cr(Ⅵ)在P—M敬。AIO4.6上的静态吸附过程符合Freundlich等温方程式和伪二级动力学方程,Yoon·Nelson模型能很好地预测cr(Ⅵ)在P—Mg3.1A104.6上的动态穿透曲线。 相似文献
45.
Bacterial diversity in activated sludge from a consecutively aerated submerged
membrane bioreactor treating domestic wastewater 总被引:1,自引:0,他引:1
DU Cheng WU Zhenbin XIAO Enrong ZHOU Qiaohong CHENG Shuiping LIANG Wei HE Feng 《环境科学学报(英文版)》2008,20(10):1210-1217
The bacterial diversity of activated sludge from submerged membrane bioreactor (SMBR) was investigated. A 16S rDNA clone library was generated, and 150 clones were screened using restriction fragment length polymorphism (RFLP). Of the screened clones, almost full-length 16S rDNA sequences of 64 clones were sequenced. Phylogenetic tree was constructed with a database containing clone sequences from this study and bacterial rDNA sequences from NCBI for identification purposes. The 90.6% of the clones were a?l... 相似文献
46.
Ryan L. Fimmen Tamara D. Trouts Daniel D. Richter Jr. Dharni Vasudevan 《环境科学学报(英文版)》2008,20(10):1273-1280
The objective of this study was to improve primary-amine nitrogen (1°-N) quantification in dissolved organic matter (DOM) originating from natural waters where inorganic forms of N, which may cause analytical interference, are commonly encountered. Efforts were targeted at elucidating organic-N structural criteria influencing the response of organic amines to known colorimetric and fluorescent reagents and exploring the use of divalent metal-assisted amide hydrolysis in combination with fluorescence analyse... 相似文献
47.
Steady-state radiolysis experiments were performed to investigate the γ-irradiation treatment of pentachlorophenol (PCP) in aqueous solution. The e?ect of initial concentration on the PCP degradation was also investigated. The experimental results showed that γirradiation was able to degrade PCP in aqueous solution successfully, and the radiolytical degradation process of PCP could be described by the first-order kinetic model. When the initial concentration of PCP was 25 and 50 mg/L and the radiation dose ... 相似文献
48.
Adsorption of mercury on laterite from Guizhou Province, China 总被引:1,自引:1,他引:0
The adsorption behaviors of Hg(Ⅱ) on laterite from Guizhou Province,China,were studied and the adsorption mechanism was discussed.The results showed that different mineral compositons in the laterite will cause differences in the adsorption capacity of laterite to Hg(Ⅱ).Illite and non-crystalloids are the main contributors to enhancing the adsorption capacity of laterite to Hg(Ⅱ).The pH of the solution is an important factor affecting the adsorption of Hg(Ⅱ) on laterite.The alkalescent environment (pH 7-9) ... 相似文献
49.
Residues of organochlorine pesticides in surface soils from college school yards
in Beijing, China 总被引:1,自引:0,他引:1
Organochlorine pesticides (OCPs) have been a major environmental issue, attracting much scientific concern because of their nature of toxicity, persistence, and endocrine disrupting effects. Soil samples were collected from ten college school yards in Beijing in 2006 and analyzed to determine fifteen OCPs. Dichlorodiphenyltrichloroethanes (DDTs) were found to be the main pollutants, accounting for 93.70% of total OCPs, followed by hexachlorohexanes (HCHs) (2.25%) and hexachlorobenzene (HCB) (1.82%). Content... 相似文献
50.
Dissimilatory Fe(Ⅲ) reduction characteristics of paddy soil extract cultures treated with glucose or fatty acids 总被引:2,自引:0,他引:2
《环境科学学报(英文版)》2008,(9)
Dissimilatory Fe(Ⅲ) reduction is a universal process with irreplaceable biological and environmental importance in anoxic environments. Our knowledge about Fe(Ⅲ) reduction predominantly comes from pure cultures of dissimilatory Fe(Ⅲ) reducing bacteria (DFRB). The objective of this study was to compare the effects of glucose and a selection of short organic acids (citrate, succinate, pyruvate, propionate, acetate, and formate) on Fe(Ⅲ) reduction via the anaerobic culture of three paddy soil solutions with Fe... 相似文献