CH_3COOOH/H_2O_2液相氧化脱除烟气中砷的实验研究

针对环境中的砷污染对人体健康的影响,以CH3COOOH/H2O2溶液作为吸收剂,在自行设计的小型鼓泡反应器中进行了烟气脱砷的实验研究.考察了H2O2浓度、过氧乙酸投加量和模拟烟气成分等因素对烟气脱砷效率的影响.结果表明,在H2O2浓度为0.2mol/L,CH3COOOH投加量为0.04mol/L,溶液pH值为5.5,吸收液温度为50℃时,脱砷效率可达100%.采用高效液相色谱-氢化物发生-原子荧光联用技术(HPLC-HG-AFS)对液相离子产物进行了定性与定量检测,脱砷产物主要为As(V).

Experimental Study on the Removal of Arsenic from Flue Gas by CH_3COOOH/H-2O_2 Oxidation Method

Aim at the arsenic pollution in the environment on human health,with CH_3COOOH/H_2O_2 reagent as the absorbents,the experimental study on the removal of arsenic in flue gas by CH_3COOOH/H_2O_2 oxidation process were carried on in the self-designed bubbling reactor.The influence of H2 O2 concentration,dosage of CH3 COOOH,SO2 concentration,NO concentration,oxygen content and carbon dioxide conctent on the removal of arsenic was studied,respectively.The optimum operating parameters were:the concentration of H2 O2 was 0.2 mol/L,dosage of CH3 COOOH was 0.04 mol/L,the pH value of the absorbent was 5.5,the reaction temperature was 50℃.Under optimal conditions,the removal efficiency of arsenic reach100%.Meanwhile,based on the qualitative and quantitative detection of related ions in solution by high-performance liquid chromatography-hydride generation-atomic fluorescence spectrometer(HPLC-HG-AFS).The As(V)is the main product of arsenic removal.