Study On The Treatment Of Odor Pollution With High Effective Absorption-oxidation Technology In Petrochemical Enterprise

The preliminary study on the treatment of simulation odor with highly effective absorption-oxidization technology was carried out according to the odor pollution characteristic and present situation of examining and repairing time in petrochemical enterprises. Taking screening of highly effective oxidization-absorption solution as the goal, the absorption-oxidation influencing factors, the design of padding tower, the operating condition, the absorption-oxidation mechanism and dynamics process have been discussed in this study.Two kinds of high effective absorption-oxidation solution were obtained through massive screening experiments of which the removing efficiency of hydrogen sulfide odor was 99.67% and 99.60% respectively. The XSYH-1 solution could be regenerated through aeration; The XSYH-2 solution was industrial bleaching powder which was cheap and gained easily.The foundation experiment results indicated that the best experimental condition for XSYH-1 was as followed: Sodium carbonate concentration 50g·L^-1, catalyst concentration 0.3g·L^-1, the absorption-oxidation temperature 50℃and regeneration time 3 hours; The removing efficiency of hydrogen sulfide could maintain above 99% when the density changed from 0 to 10000 mg·m^-3 by which the removing efficiency was effected slightly. For XSYH-2, the best experimental condition was as followed: the ingoing quantity of bleaching powder 2g·L^-1 and odor input 0.5L·min^-1; The absorption-oxidation efficiency was effected by the temperature slightly and it could be operated in room temperature. The removing efficiency of hydrogen sulfide could maintain above 98.8% when the density changed from 0 to 13000 mg·m^-3. Both of the two kinds of absorption solution may be suitable for the treatment of hydrogen sulfide odor with different density scope.The padding tower condition experiment results indicated that for two kinds of absorption-oxidation solutions, the removing efficiency of hydrogen sulfide increased firstly and then reduced slightly along with the increase of odor ingoing density. When the hydrogen sulfide density less than 8000 mg·m^-3, the hydrogen sulfide removing efficiency of XSYH-1 solution maintained above 99.3%; When the hydrogen sulfide density less than 7800 mg·m^-3, the hydrogen sulfide removing efficiency of XSYH-2 solution maintained above 99.1%. On the condition of similar hydrogen sulfide ingoing density, the removing efficiency became higher when the odor residence time got longer; The hydrogen sulfide removing rate increased along with the liquid gas ratio; Pressure drop of both two absorption solutions in the padding tower changed slightly in the operating process; The orthogonal experiment results showed that the best operating conditions were as followed: odor input 0.5m³Â·h^-1, the liquid gas ratio 20L·m^-3, the temperature room temperature; The analysis of absorption-oxidization principle and dynamics indicated that the oxidation product mainly was sulfur for both absorption solutions and a few sulfate for XSYH-2. The absorption-oxidation mass transfer resistance mainly concentrated in the gas phase.