| More and more attention has been paid to the treatment of Chlorinated organic and malodorous gases. In this paper, the treatment of dichloromethane and carbon disulfide in air by absorption combined with iron-activated carbon micro-electrolysis were experimentally investigated.A cylindrical glass reactor (Φ3.1cm×53.5cm) was used in the experiment. The filling volume of iron-active carbon (Fe-C) combination in the reactor was about0.25L (Φ30mmx300mm). All the fillings were immerged into water solution which was recycled by a water pump. The simulated sample gas was introduced into the reactor from the bottom through the packing zone and discharged from the top of the reactor. As a comparison, the same experiment was implemented by the reactor filled with iron mash, activate carbon particle and iron-active carbon (Fe-C) combination, respectively. The influence of inlet gas flow rate, initial pH of water, Fe-C ratio and the different acid absorption liquid on the removal of dichloromethane and carbon disulfide were experimentally investigated. The changes of pH and ORP value in different absorption solution were measured.Experimental results showed that both dichloromethane and carbon disulfide were effectively removed by Fe-C micro-electrolysis. The removal of these two pollutants increased when the pH value of the solution decreased. It was found that Cl-concentration in the solution with a pH value of1.5is about4times than that with the pH value of5after300min reaction. The removal of carbon disulfide was47.3%,43.5%,35.4%and30.7%when the initial pH value is1.5,2.5,3.5and5, respectively. It was found that the removal was lower using H2SO4to adjust pH of solution than that using HC1.The main gaseous product from dechlorination of dichloromethane by Fe-C was confirmed to be methane by gas chromatography. The reaction products of carbon disulfide which was degraded by Fe-C micro-electrolytic were CO2, H2S, CH4and COS. |
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