共查询到17条相似文献,搜索用时 78 毫秒
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简单介绍化学除磷技术及传统的生物除磷工艺,分析生物除磷技术的发展趋势,并对以反硝化除磷工艺为代表的生物除磷新技术的工艺原理及特点做了介绍。认为,以目前我国的经济和发展情况,生物与化学联合除磷将是水处理技术的发展趋势,但化学除磷试剂对生物处理系统性能可能会产生影响,还需进一步的研究以促进其应用和发展。 相似文献
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氮和磷是地表水体中比较受关注的两种污染物,生活污水过量排入河湖等地表水体中,将引起水体富营养化.着重阐述了改性后的矿物型和非矿物型材料在吸氮除磷方面的研究进展,在此基础上,对其在水处理领域的应用前景进行了展望,认为结合现代先进的化学技术对环境友好型材料进行改性,开发高效的环境友好型材料,对于同步去除水体中氮磷具有重要意... 相似文献
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概述生物脱氮除磷机理,包括生物脱氮、生物除磷机理以及同步脱氮除磷机理、反硝化脱氮除磷机理。分析不同生物脱氮除磷机理的处理工艺,并阐述了脱氮除磷工艺的发展趋势。 相似文献
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采用广州市良种猪场的猪粪为种源,在厌氧混合连续流反应装置内进行厌氧除磷试验,以探讨有利于厌氧除磷产生磷化氢微生物生长的最佳营养条件,并鉴定出厌氧除磷菌. 相似文献
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Al-Sayed A. Bakr Radwa A. El-Salamony 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2018,40(11):1305-1314
A semi-pilot filtration unit had been assembled to determine the potential and the effectiveness of the single-media filtration of amphistegina tests and granular activated carbon (GAC) filters in the removal of iron from aqueous solutions in a comparative study. The results revealed that the maximum adsorption capacities of Fe(II) by GAC and amphistegina filters at 313 K and higher flow rate (60 l/min) were 4.19 and 1.34 mg/g, while at lower flow rate (20 l/min) were 3.68 and 3.64 mg/g, respectively. Also, Freundlich and Langmuir adsorption isotherms were used to verify the adsorption performance and thermodynamic parameters were discussed. 相似文献
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Fenghao Jiang Xiaohe Huang Hao Li Yifan Zhang Caiwei Wang 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2019,41(2):129-136
The utilization of Zhundong (ZD) coal has been limited by its high sodium content. In the paper, the effect of particle size on the distribution of the sodium contained in the coal and the sodium removal from the coal was addressed. The results indicate that the water-soluble sodium content and insoluble sodium content increased and the acid-soluble sodium decreased with increasing particle size. The occurrence modes of the sodium contained correlate closely to the properties of ZD coal. The water-soluble sodium and water-soluble chlorine contained in ZD coal may exist in the form of sodium chloride. Due to the competitive effects between adsorbing capability of the leachate and the diffusing capability of sodium ion, the removal sodium rate increases first and then decreases with increasing particle size. 相似文献
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Water removal from the gas diffusion layer (GDL) is crucial for the efficient operation of proton exchange membrane (PEM) fuel cell. Static pressure gradient caused by the fast reactant flow in the flow channel is one of the main mechanisms of water removal from GDL. Reactant can leak or cross directly to the neighboring channel via the porous GDL in the cells with serpentine flow channel and many of its modifications. Such cross flow plays an important role for the removal of liquid water accumulated in the GDL especially under land area. To investigate the characteristics of liquid water behavior in the GDL under pressure gradient, the fibrous porous structure of the carbon paper is modeled by three dimensional impermeable cylinders randomly distributed in the in-plane directions and unsteady two-phase simulations are conducted. It is shown that the permeability from the numerical model matches well the experimental measurements of the common GDLs in the literature. The contact angle and pressure gradient are the key parameters that determine the initiation and the process of liquid water transport in the GDL which is initially wet with stagnant liquid water. It has been observed that the larger contact angle results in faster water removal from the GDL. Numerical simulations are performed for a wide range of pressure gradient with different contact angles to determine the minimum pressure gradient that initiates the liquid water transport in the GDL. It is found that the amount of pressure gradient caused by the cross flow is sufficient and effective to get rid of the liquid water accumulated in the GDL. The simulation results are also compared with experimental data in literature showing a good agreement. The characteristics of liquid water discharging from the gas diffusion layer are also described. 相似文献