Chemo-biochemical Desulphurization of Various Gaseous Streams on Bench Scale     

R. A. Pandey  S. Malhotra  A. S. Rajvaidya  S. Sharma  S. Peshwe  V. K. Raman  A. S. Bal 《Water, air, and soil pollution》2004,154(1-4):295-311

The gaseous streams containing hydrogen sulphide (H₂S) mixed with nitrogen gas (N₂) (H₂S, 0.00145 mol L^-1), H₂S mixed with liquefied petroleum gas (LPG) and refinery fuel gas were evaluated, in batch operation, in a bubbled column reactor for desulphurization using ferric sulphate as an oxidant. Further, the ferrous sulphate produced in the process of oxidation is biologically oxidized to ferric sulphate using biomass enriched with Thiobacillus ferrooxidans-JSPR1 in flask culture experiments. In all the cases, the gases were bubbled into the biologically generated ferric sulphate (from ferrous sulphate solution) for the oxidation of H₂S. The results indicate that0.00426 mol L^-1 of ferric ions are required for reacting with0.00145 mol L^-1 of H₂S in a gaseous stream containing mixture of N₂ and H₂S. A concentration of 0.00447 mol L^-1 of ferric ions is needed for oxidation of 0.00145 mol L^-1 of H₂S mixed with LPG. Similarly, the refinery fuel gas containing 0.0031 mol L^-1 of H₂S requires 0.00428 mol L^-1 of ferric ion for effective desulphurization. The ratio of moles of H₂S reacted to moles of Fe²⁺ produced at optimal condition was 0.533, 0.516, 0.510, respectively, for nitrogen mixed H₂S, LPG mixed H₂S and refinery fuel gas containing H₂S. The removal of H₂S from these gaseous streams was more than 98%sulphate produced in the process could be biologically oxidized to ferric sulphate with an efficiency of 98%, using shake flask culture experiments. Based on flask culture experiments for biooxidation of commercial ferrous sulphate to generate ferric sulphate, the biokinetic constants viz. yield coefficient y, maximum specific growth rate constant μ_max and half saturation rate constant K _s were evaluated. The yield coefficient was found to be 0.112 while μ_max and K _s were observed to be 0.1686 hr^-1 and 187.9 mg L^-1, respectively. The evaluation of biokinetic constants for bio-oxidation of ferrous sulphate generated during the scrubbing of refinery fuel gas containing H₂S indicated the value of μ_max and K _s as 0.1426 hr^-1 and 205 mg L^-1, respectively. The value of yield coefficient in this real system was found to be 0.102.  相似文献   

Bench Scale Evaluation of a Chemo-biochemical Process for Desulphurization of Gaseous Streams Containing Hydrogen Sulphide     

Pandey  R. A.  Malhotra  S.  Rajvaidya  A. S.  Sharma  S.  Peshwe  S.  Raman  V. K.  Bal  A. S. 《Water, air, and soil pollution》2003,142(1-4):243-260

Gases and suspended particulate matter are sampled and measured in situ at different sites within the city of Madrid to determinethe air pollution in the city. Lead concentrations in air are also determined. The information needed to assess levels of contaminants is obtained combining several analytical techniques,which provide real time concentration data of particles andgases. Particulate matter (PM), SO₂, CO, O₃, NO_x,NO₂, CH₄, total hydrocarbons and Pb were measured. Concentrations of pollutants are averaged over periods of hours,days, months and years. Variations of contaminant concentrationsin the last years are presented. Spatial and temporal distribution follows that of the traffic, the main source of pollution in Madrid City. Some specific measurements were carriedout to understand the influence of traffic emissions at themeasured site. Further, all measured concentrations never exceeded the European Union Directives.  相似文献