On-line monitoring of gas-phase bioreactors for biogas treatment: hydrogen sulfide and sulfide analysis by automated flow systems
On-line monitoring of gas-phase bioreactors for biogas treatment: hydrogen sulfide and sulfide analysis by automated flow systems
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DOI：
10.1007/s00216-008-1891-5
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发表时间：
2008-06-01
影响因子：
4.3
通讯作者：
Gabriel, David
中科院分区：
文献类型：
--
作者：
Redondo, Rosa;Cunha Machado, Vinicius;Gabriel, David
沼气是在厌氧条件下通过生物过程产生的，可能含有高达20，000 ppm（v）的硫化氢（H2S），这是一种腐蚀性物质，会攻击动力发动机并影响工业人员的健康。必须从沼气中去除H2S，特别是在沼气燃烧用于能源生产的热电联产设施中。目前，生物过滤技术被认为是除传统化学法外的一种有效的生物脱硫方法。这项工作的新奇是设计和建造的自动化H2S在线分析仪，以评估气相生物反应器的液相和气相的组成。该分析仪由两个平行流配置组成，它们共用同一检测装置。第一种配置是单通道流动注射分析仪（FIA），用于检测液相中的S-2-。第二种配置是具有气体扩散步骤（GD CFA）的连续流动分析仪（CFA），用于检测气相中的H2S。扩散步骤能够从样品中分离H2S（g）并将其转化为可检测的化学物质（S2-）。用对S-（aq）（2）-具有选择性的Ag 2S离子选择性电极（伊势）进行S-2-检测。流动注射系统的主要响应参数为3 × 10 ~（-5）~ 1 × 10 ~（-1）mol L ~（-1）S ~（2-）（0.61 ~ 3，200 mg L ~（-1））的线性范围，灵敏度为27.9 mV decade（-1），检出限为1.93 × 10 ~（-5）mol L ~（-1）S ~（2-）。GD -CFA配置呈现400和10，000 ppmv H2S（g）之间的线性范围，灵敏度为26.1mV decade（-1），检测限为245 ppmv H2S。建议的分析仪被用于分析真实的气体和液体样品，在一个全面的生物滴滤器在城市污水处理厂的沼气处理的最佳结果。
Biogas is produced by biological processes under anaerobic conditions and may contain up to 20,000 ppm(v) hydrogen sulfide (H2S), a corrosive substance that attacks power engines and can affect the health of the industrial staff. H2S must be removed from the biogas, especially in co-generation facilities where the biogas is burnt for energy production. Nowadays, biofiltration is being studied and considered as an interesting alternative for removing H2S from the biogas besides classical chemical processes. The novelty of this work is the design and construction of an automated H2S on-line analyser to assess the composition of the liquid and gas phases of gas-phase bioreactors. The analyser is made of two parallel flow configurations which share the same detection device. The first configuration is a single-channel flow injection analyser (FIA) to detect S-2-in the liquid phase. The second configuration is a continuous flow analyser (CFA) with a gaseous diffusion step (GD CFA) for detecting H2S in the gas phase. The diffusion step enables separation of the H2S(g) from the sample and its conversion into a detectable chemical species (S2-). S-2-detection was performed with an Ag2S ion-selective electrode (ISE) selective to S-(aq)(2)-. The main response parameters of the FIA system are a linear range between 3 x 10(-5) and 1 x 10(-1) mol L-1 S-2-(0.61 -3,200 mg L-1), with a sensitivity of 27.9 mV decade(-1) and a detection limit of 1.93 x 10(-5) mol L-1 S2-. The GD -CFA configuration presents a linear range between 400 and 10,000 ppmv H2S(g) with a sensitivity of 26.1 mV decade(-1) and a detection limit of 245 ppmv H2S. The proposed analyser was used by analysing real gas and liquid samples with optimal results at a full-scale biotrickling filter for biogas treatment at a municipal wastewater treatment plant.