共查询到20条相似文献，搜索用时 171 毫秒
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污水生物脱氮除磷工艺 总被引：2，自引：0，他引：2
在阐述城市污水生物脱氮除磷机理的基础上,分析生物脱氮除磷的AB法、A2/O法、A＋A2O法、SBR法、CASS法等的工艺。随着生物脱氮除磷技术研究的深入,工艺简单、处理效率高、能耗低的组合新工艺将成为脱氮除磷工艺的发展趋势。 相似文献
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介绍了污水脱氮除磷的方法以及城市污水处理中主要采用的生物脱氮除磷工艺,并对有脱氮除磷要求的城市污水处理工艺的选择提出了看法。 相似文献
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本文从污水水体中氮的存在形态和主要危害谈起。阐述传统生物脱氮技术及其存在的局限性,重点介绍包括同步硝化反硝化工艺、短程硝化反硝化工艺、厌氧氨氧化工艺的新型生物脱氮方法及其技术特点,并简单介绍了曝气生物滤池的研究进展和发展方向。 相似文献
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脱氮除磷工艺研究进展 总被引：1，自引：0，他引：1
文章总结了近两年来国内在脱氮除磷工艺研究方面的进展。近两年来,脱氮除磷技术又有了新的发展,表现在短程硝化反硝化,同步硝化反硝化及其两者在SBR,氧化沟,AAO连续工艺中的表现且已经开始了两者在自动化控制方面的应用。 相似文献
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针对传统生物脱氮工艺存在的不足之处,介绍了新型生物脱氮工艺的类型,并分别叙述了其原理、特点及应用情况。 相似文献
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概述了城市污水生物脱氮除磷倒置A^2／O工艺的技术特点,对倒置A^2／O工艺进行了讨论,并介绍了国内一些工程应用实例。 相似文献
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The removal of mercury from dilute solutions of mercuric nitrate by mercuric sulfide is indicative of an adsorption process. The relation of log vs. log C shows that the Freundlich adsorption isotherm exists.At higher concentrations of mercuric nitrate a reaction takes place with the mercuric sulfide forming a compound of the possible formula 2HgS·Hg(NO3)2 mercuric nitratodisulfide. 相似文献
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A silver nitrate test is described for the quantitative determination of residual hypo in photographic prints. The hypo is converted in situ to silver sulfide, the transmission density of the sulfide determined, and the hypo content obtained by reference to a standard curve.The method used to establish the standard curve is outlined, the data being verified by quantitative analyses.A simplified procedure is suggested involving the application of a drop of silver nitrate to the back of the print and then matching the spot visually with a set of standards. 相似文献
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Experimental results are given indicating the accuracy obtained when the sulfate ion is determined as barium sulfate before and after the removal of the metals of the acid hydrogen sulfide group from the solution. Solutions of cadmium, mercury, bismuth, copper, antimony, arsenic and tin were used in the determinations. 相似文献
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将聚硅硫酸铁作为化学除磷剂,用以辅助生物除磷,使污水处理厂废水中的磷得以去除。文章通过对聚硅硫酸铁的浓度及投加量等因素对废水中总磷去除效果的影响进行探讨,分析聚硅硫酸铁作为废水化学除磷剂的最佳用量,使污水处理厂的出水达到排放标准要求。 相似文献
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Klaus H. Theopold 《Journal of The Franklin Institute》2005,342(6):586-591
The Franklin Institute, Philadelphia, Pennsylvania, awarded the 2004 Benjamin Franklin Medal in Chemistry to Harry B. Gray for his pioneering contributions in the field of electron transfer in metalloproteins. In a series of elegant and challenging experiments beginning in the late 70s, Gray and his coworkers have shown that the transfer of electrons in metalloproteins can proceed over long distances (~ 20 Å) and at fast rates. These experiments have involved the regiospecific functionalization of structurally characterized electron transfer proteins with ruthenium complexes, coupled with laser excitation and transient spectroscopy. Probing the effects of thermodynamic driving force, temperature, donor-acceptor distance and electronic coupling, Gray has shaped our detailed current understanding of the principles governing biological electron flow. The mechanism of electron transfer has been identified as electron tunneling mediated by the molecules separating donor and acceptor. Tunneling timetables have been established for various intervening media. Important biological processes like respiration and photosynthesis depend on facile electron transfer, and Gray's contribution serves as the fundamental basis for understanding these and many related reactions. 相似文献
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通过对复杂难选的大厂锡石多金属硫化矿尾矿的矿石性质的分析,提出了采用先进的选矿工艺流程和先进技术,特别是合理地利用好分级技术,能实现在流程的前段大量丢尾,并为微细粒锡石的重选回收创造良好的分选条件,是成功回收大厂矿区低品位复杂难选锡石多金属硫化矿尾矿的关键。 相似文献
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在污水强化生物脱氮除磷系统中,碳源种类及浓度对于处理系统去除效果的高效运行起到重要的作用。通过介绍生物脱氮及除磷各步骤碳源需求的机理,探讨碳源类型及碳源浓度对系统脱氮除磷效果的影响,同时对提高污水碳源浓度常用的手段即增加外碳源及内碳源方法进行分析。 相似文献