炼厂酸性水恶臭气体处理工艺研究

Study on treatment process of odorous gas from acidic waste of refinery

采用碱吸收、液相氧化及固相催化氧化联合工艺处理炼厂酸性水挥发出的恶臭气体,考察了该工艺对恶臭气体主要组分硫化氢(H2S)和挥发性有机化合物(VOCs)的去除效果。结果表明,当恶臭气体中H2S质量浓度为2 000～4 000 mg/m3、VOCs质量浓度为1 500～2 600 mg/m3时,仅通过碱吸收H2S的去除率就可达99%以上,但VOCs的去除率小于5%;同一氧化剂NaClO,H2O2或KMnO4在酸性条件下对恶臭气体中VOCs的氧化去除效果要优于碱性条件下,其中NaClO在酸性条件下最优,VOCs去除率稳定在40%～60%;采用活性炭作为催化氧化的载体能稳定氧化剂对酸性气中VOCs的去除效果,在80℃下,VOCs的平均去除率约为80%。

The odorous gas from acidic wastewater of a refinery was treated by the alkali absorption - liquid phase oxidation - solid - phase catalytic oxi- dation combined process. The removal efficiency of the main components, such as hydrogen sulfide （H2S） and volatile organic compounds （VOCs） of the odorous gas was investigated. The results showed that the removal rate of H2S was more than 99% under the condition of 2 000- 4 000 mg/m3 H2S and 1 500 - 2 600 rag/m3 VOCs in odorous gas, while the corresponding removal rate of VOCs was lessthan 5%. The removal efficiency of VOCs in acidic medium was higher than that in alkaline for any oxidant in NaC10, KMnO4 and H2O2. Among them, Na- CIO in acidic medium exhibited the largest removal of VOCs ranging from 40% to 60%. When active carbon was used as carrier of catalyst, the average removal rate of VOCs could reach about 80% at 80 ℃.