Oxidation absorption of gaseous hydrogen sulfide (H 2 S) using Fenton-like advanced oxidation systems in a bubble column reactor was investigated for the first time. Experiments were carried out to evaluate the effects of main process parameters (Fe 3+ and Cu 2+ concentrations, H 2 O 2 concentration, solution temperature, H 2 S inlet concentration, initial solution pH, and gas flow rate) on H 2 S removal. Reaction products and free radicals of the H 2 S removal process were measured. Mechanism and reaction paths of H 2 S removal were also proposed. The results indicated that H 2 S removal efficiency was increased by increasing the Fe 3+ /Cu 2+ concentration and was reduced by increasing the H 2 S inlet concentration and gas flow rate. Increasing the H 2 O 2 concentration, initial solution pH, and solution temperature could increase at first and then reduce H 2 S removal efficiency. H 2 S removal by oxidation of hydroxyl radicals is the main removal pathway. The main products of H 2 S removal are sulfuric acid, elemental sulfur, and copper sulfide in solutions, which can be easily recovered and achieve zero emission.
We established local complete blood count reference intervals for apparent healthy preschoolers in China. It is necessary to establishing region-specific reference intervals of complete blood count for preschoolers.
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