活性炭吸附协同介质阻挡放电降解甲硫醚

Decomposition of Dimethyl Sulfide in Dielectric Barrier Plasma Discharge Assisted by Active Carbon

采用活性炭协同介质阻挡放电技术对恶臭物甲硫醚去除进行了研究。结果表明,甲硫醚去除率随着能量密度的提高而上升。在相同能量密度下,等离子体反应器中引入活性炭可以显著提高去除率。当能量密度大于288 J·L-1时,甲硫醚去除率>98%。甲硫醚去除率随着初始浓度和气体流量的增大而降低。本实验中,湿度显著影响甲硫醚在活性炭协同等离子体体系中的降解,25%的相对湿度(20℃)最有利于促进甲硫醚去除。等离子体中加入活性炭可以有效控制副产物,在能量密度为648 J·L-1时,出气中O3和SO2可以从242 mg·m-3、140 mg·m-3(无活性炭)分别控制到20 mg·m-3、50 mg·m-3(有活性炭)。控制合适的能量密度,活性炭可长时间保持吸附活性,无需更换。

Decomposition of dimethyl sulfide（DMS） in air by dielectric barrier plasma discharge assisted with active carbon（AC） was investigated experimentally.The results show that,under a fixed energy input density,introducing active carbon into plasma reactor can promote the decomposition of DMS obviously;the decomposition of DMS increases with increasing energy density input,and when the energy input density is more than 288 J·L-1,the decomposition of DMS exceeds 98%.While the decomposition of DMS decreases with increasing initial DMS concentration and gas flow rate.It was found that,under the experiment conditions,the humidity has an obvious effect on the decomposition of DMS,and the relative humidity of 25%（20℃）is most beneficial for the decomposition of DMS.The by-products of the decomposition can be effectively controlled by introducing active carbon into the dielectric barrier plasma discharge.After introducing AC,the concentrations of O3 and SO2 in outlet gas reduce from 242 mg·cm-3 and 140 mg·cm-3 to 20 mg·cm-3 and 50 mg·cm-3,respectively.The added active carbon can keep high adsorption activity for 80 h under an energy input density of 450 J·L-1.