| Malodors are the main culprits of air pollution, which would bring serious effects to peoples health and daily life. In this paper, both gas streams containing toluene and ammonia were treated by solution absorption combined with electrochemical oxidation.The electrochemical reactor used in the experiment was a cylindrical glass reactor. The volume of the reactor was about300mL (Φ30mm×300mm), and a layer of stainless steel mesh was attached to the inner wall of the reactor as the cathode of the reactor. The material of anode was Ti with a cover of RuO2on the surface. The simulated malodors such as ammonia and toluene were introduced into the reactor by an aerator from the botten of the reactor. The effects of operation parameters, like current density, pH and kind of electrolyte solution on the removal of ammonia and toluene were experimentally investigated. The oxidation reduction potential (ORP) of the absorption solution was also measured. Experimental results showed that both ammonia and toluene were effectively removed by absorption combined with electrochemical oxidation. It was found that the removal of toluene and ammonia increased with the increasing of current density. When the current density increased from0.01A/cm to0.025A/cm, the removal of ammonia increased from91.18%to96.91%, and the removal of toluene increased from30.41%to39.89%, respectively. The removal of ammonia was higher in the acidic environment than that in the alkaline environment. With the decrease of pH, the removal of ammonia increased gradually in the acidic environment, while the removal decreased as the pH increased in the alkaline environment. It was found that it was beneficial for toluene oxidation in acidic solution. Experimental result also indicated that the removals of both toluene and ammonia were higher in NaCl solution than that in Na2SO4solution.According to the analysis of the products of tuluene by means of GC-MS and UV spectral scaning, the major product of toluene oxidation in the solution was confirmed to be benzoic acid. |
