天然沸石与泥炭脱氮除磷实验研究

设计并构建了天然沸石与泥炭生物滤池装置,实验考察其在微污染景观水中脱氮除磷性能,研究其形成生物膜系统后对污染物去除的机理及效果。结果表明：该装置具备良好的生物去除污染物效果,运行稳定后CODcr、NH4＋-N和TP去除率分别可达80%、95%和41%;通过生物作用可使天然沸石与泥炭再生,实现材料持续使用。     

沸石泥炭合成材料及其脱氮除磷实验研究

利用天然沸石和泥炭作为原材料,水泥作为粘结荆,成功研制了具有抗压和抗拉强度的一种新型环保合成材料.实验结果表明:天然沸石、泥炭、水泥三者质量比为7:1:4时,合成材料的抗压强度高于混凝土实心砖等级标准中的最低等级MUl5,抗拉强度高于混凝土结构设计规范标准中的最低等级C15,耐水性良好,对氨氮和总磷的去除效果好,且遵循...     

污水除磷技术的研究进展

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。     

吸氮除磷材料的研究进展

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...     

反硝化除磷机理及其工艺影响因素研究进展

污水生物脱氮除磷是防止水体富营养化问题的有效途径之一,反硝化除磷菌在反硝化的同时完成过量摄磷,较传统生物脱氮除磷具有节约碳源、节省曝气量和污泥产量低等优点,是目前脱氮除磷工艺开发的研究热点.介绍当前反硝化除磷菌的生物学机理及其工艺运行的主要影响因素.     

现代污水处理生物脱氮除磷工艺分析

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。     

泥炭与沸石制取吸附材料实验研究

利用天然沸石和泥炭作为原材料,水泥作为粘结剂,研制出一种具有一定强度并同时具有脱氮除磷功能的新型吸附材料.实验结果表明:天然沸石∶天然泥炭∶水泥质量比为=2∶0.05∶1时,该材料抗压强度可达6.79 MPa,耐水性能良好.材料吸附性能实验结果揭示,该材料对氨氮和总磷具有良好的去除效果,符合准二级动力学模型.     

反硝化除磷理论及其影响因素分析

综述传统生物除磷机理及反硝化除磷机理,并分析反硝化除磷的影响因素和未来发展新思路。     

厌氧除磷过程的影响因素和功能菌的筛选

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.     

污水生物除磷脱氮新技术探讨与展望

概述了传统的生物除磷脱氮的基本原理与局限性,并介绍了新的除磷脱氮理论及典型工艺,指出反硝化除磷脱氮技术是未来污水生物处理可持续的发展方向。     

水生植物千屈菜夏季生理变化及其脱氮除磷实验研究

研究了千屈菜在夏季微污染水体中的生理特性日变化规律和脱氮除磷净水效果.在三种不同栽植密度的净水槽中,分别考察了千屈菜根系POD活性、根系活力、Ch1a和Ch1b含量以及水体中NH4+-N、TP和CODcr污染物浓度等指标,分析了植物生理特性日变化规律及其与脱氮除磷性能和栽植密度之间的关系.结果表明:根系POD活性、根系...     

污泥制取新型环保合成材料实验研究

以微波处理后城市污水厂污泥、天然沸石和水泥为原材料,不进行任何改性,研制一种既具有脱氮除磷功能,又具备抗压强度,并可在水体中保持一定形态的低能耗新型环保合成材料。实验结果表明:水泥:天然沸石:污泥的质量比为1:2:0.05,合成材料的耐水性能良好,7 d的抗压强度为5.8 MPa,对氨氮、总磷的吸附量分别可达到229.8 mg·kg-1以及321.4 mg·kg-1,且符合准二级动力学模型。     

沸石在水处理中脱氮应用现状分析

沸石是一种天然、无毒无害、无污染的环境友好型材料,采用沸石处理水有许多其它方法无法比拟的优点。利用沸石的吸附与离子交换性质去除污染物具有工艺简单、操作方便、高效快速以及无二次污染等优点而倍受人们关注。首先分析了天然沸石在水处理中的脱氮应用情况,然后针对天然沸石存在的问题,对目前的解决方法进行了分析和研究,最后提出生物再生改性沸石,可较好地解决沸石脱氮在水处理工程中推广的瓶颈问题。     

Iron removal from aqueous solutions by amphistegina filter

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.     

Effect of particle size on sodium distribution and sodium removal by water washing of Zhundong coal

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.     

Numerical investigations on liquid water removal from the porous gas diffusion layer by reactant flow

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.     

结晶法除磷技术的发展与应用

探讨了结晶法（形成难溶的磷酸铵镁、羟基磷酸钙晶体）除磷技术的原理与研究现状。pH、污水中各组份的离子浓度及其摩尔比是结晶形成的最主要影响因素,除磷效率与水中氨氮浓度及Mg与P的摩尔比呈正相关。反应器中投加晶种与增加扰动可以加快结晶形成与长大。曝气是提高污水pH并达到结晶范围的有效途径。回收的磷酸铵镁晶体纯度高,可以作为磷资源加以利用。