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首页> 外文期刊>Analytical and Bioanalytical Chemistry >On-line monitoring of gas-phase bioreactors for biogas treatment: hydrogen sulfide and sulfide analysis by automated flow systems
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On-line monitoring of gas-phase bioreactors for biogas treatment: hydrogen sulfide and sulfide analysis by automated flow systems

机译：在线监测用于沼气处理的气相生物反应器：通过自动流量系统进行硫化氢和硫化物分析

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摘要

Biogas is produced by biological processes under anaerobic conditions and may contain up to 20,000 ppmv 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 S2? 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?). S2? detection was performed with an Ag2S ion-selective electrode (ISE) selective to ${text{S}}^{{text{2}} - } _{left( {{text{aq}}} right)} $ . The main response parameters of the FIA system are a linear range between 3 × 10?5 and 1 × 10?1 mol L?1 S2? (0.61–3,200 mg L?1), with a sensitivity of 27.9 mV decade?1 and a detection limit of 1.93 × 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.
机译：沼气是通过在厌氧条件下的生物过程产生的，可能包含高达20,000 ppmv 硫化氢（H2 S），这是一种腐蚀性物质，会腐蚀动力发动机并影响工业人员的健康。必须从沼气中除去H2S，特别是在热电联产设施中，沼气被燃烧以产生能量。如今，除了经典的化学过程外，生物滤池正在被研究并被认为是从沼气中去除H2 S的有趣替代方法。这项工作的新颖之处在于设计和构建了一种自动化的H2 S在线分析仪，用于评估气相生物反应器中液相和气相的组成。分析仪由共享同一检测设备的两个平行流配置组成。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S2？。第二种配置是具有气体扩散步骤（GD–CFA）的连续流分析仪（CFA），用于检测气相中的H2S。扩散步骤可将H2 S（g）从样品中分离出来并将其转化为可检测的化学物种（S2？）。用对$ {text {S}} ^ {{text {2}}-__left（{{text {aq}}}对）} $。 FIA系统的主要响应参数是3×10？5 和1×10？1 mol L？1 S2？之间的线性范围（0.61–3,200毫克L？1 ），灵敏度为27.9 mV十进制？1 ，检出限为1.93×10？5 mol L？1 S2？。 GD-CFA配置的线性范围为400至10,000 ppmv H2 S（g），灵敏度为26.1 mV十进制？1 ，检出限为245 ppmv H2 S。拟议的分析仪可用于分析实际的气体和液体样品，并在全尺寸生物滴滤池上获得最佳结果，用于市政污水处理厂的沼气处理。

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