BTF系统处理硫化氢废气工程设计外文参考文献译文及原文Word文档下载推荐.doc

1、专 业： 环境工程 年级班别： 2004级（1）班 学 号： 3104008168 学生姓名： 谢 辉 指导教师： 陈凡植教授 2008 年 6 月 11 日1Biological sweetening of energy gases mimics in biotrickling filtersMarc Fortuny a,c , Juan A. Baeza a, Xavier Gamisans b, Carles Casas a, Javier Lafuente a,Marc A. Deshusses c,*, David Gabriel a,1 a Department of Chemic

2、al Engineering, Universitat Autonoma de Barcelona, Edifici Q, Campus de Bellaterra, 08193 Bellaterra, Barcelona, Spainb Department of Mining Engineering and Natural Resources, Universitat Politecnica de Catalunya, Manresa, Spain c Department of Chemical and Environmental Engineering, University of C

3、alifornia, Riverside, CA 92520, United StatesReceived 25 July 2007; received in revised form 27 October 2007; accepted 29 October 2007Available online 21 December 2007AbstractRemoval of hydrogen sulfide from waste and energy-rich gases is required, not only because of environmental health and safety

4、 reasons, but also because of operational reasons if such gases have to be used for energy generation. A biotrickling filter for the removal of ultra-high concentrations of H2S from oxygen-poor gases is proposed and studied in this work. Two laboratory-scale biotrickling filters were used to study t

5、he startup period and to determine the long-term performance of the gas sweetening process. The inlet H2S concentration ranged from 900 to 12000 ppmv and two different packing materials were investigated. There was no toxicity effect observed even at a the highest H2S concentration, and maximum elim

6、ination capacities of 280 and 250 g H2S m-3 h-1 were obtained at gas contact times of 167 and 180 s, respectively. Elemental sulfur and sulfate were found to be the most abundant end-products of the biological oxidation of sulfide when operated under microaerophilic conditions. The biotrickling filt

7、er was able to quickly recover its nominal performance after different load increases and system shutdowns simulating field operation. The results reported here show that biotreatment can be an interesting alternative to conventional gas sweetening systems normally used for such applications.Keyword

8、s: Hydrogen sulfide; Gas sweetening; Biotrickling filter; Desulfurization; Fuel gas; Biogas1. IntroductionHydrogen sulfide is a common reduced sulfur compound found in several industrial waste gases. It is easily recognizable by its offensive rotten eggs odor. However, odor nuisance is not the main

9、issue in energy-rich gases such as biogas from anaerobic digesters which may contain H2S concentrations exceeding 500 ppmv and up to 20000 ppmv （2% v/v） （Woodcock and Gottlieb, 2004）. In such cases, H2S removal, often called gas sweetening, is necessary to avoid corrosion of combustion engines and S

10、Ox generation in the flue gases. Thus, removal of H2S from waste and energy-rich gases is required, not only for environmental health and safety reasons but also for operational reasons. So far, the most commonly used treatment technology for H2S removal is selective absorption in amines such as dig

11、lycolamine, monoethanolamine, methyldiethanolamine or other compounds that have a high affinity for H2S （Woodcock and Gottlieb, 2004）. Although these processes have been extensively and successfully applied, they have many drawbacks such as high energy and operating costs due to the regeneration of

12、the absorbent phase. In this context, biological processes for air pollution control are gaining popularity （Deshusses, 1997; Devinny et al., 1999; Kennes and Veiga, 2001） but have not yet been generally applied to treatment of H2S in energy-rich gases. Biological H2S utilization as energy source fo

13、r lithoautotrophic organisms is a well-known process that can be described with the following overall reactions （Eqs. （2）, （3）. Note that oxidation to elemental sulfur can only happen under oxygen limited conditions, and that excess oxygen is required for the formation of sulfate （Kuenen, 1975; Wood

14、cock and Gottlieb, 2004）.Biofilters, bioscrubbers and biotrickling filters have been proven to be a suitable, environmentally friendly and costeffective alternative for waste gas treatment, especially for the treatment of low concentrations of H2S （Yang and Allen, 1994; Gabriel and Deshusses, 2003a;

15、 Kim and Deshusses, 2005）. However, there has been limited success in dealing with high concentrations of H2S （1000 ppmv） using biofilters, biotrickling filters and bioscrubbers and only few industrial processes have been fully developed for such application. Among them, the Thiopaq process （Paques, The Netherlands）, and the Biopuric process （Biothane, USA） are the only ones specifically developed for the removal of high concentrations of H2S from biogas or fuel gas. The Thiopaq process is a two-reactor system consisting of a conventional caustic scrubber followed by an expanded bed bioreacto