| The odor pollution has become an important part of gaseous pollutants generated in the petrochemical industry. The waste water treatment is the important source of odorants.In this study, the cause and composition of odorants of a petrochemical wastewater treatment plant were investigated and analyzed. The results showed that alkanes, aromatic hydrocarbons, esters and aldehydes are the main compositions of the malodorous gases. The most common organics are benzene, toluene, xylene, styrene, hydrogen sulfide, ammonia, trimethylamine and acetaldehyde. The composition depends on the wastewater characteristics.By utilizing biological oxidation technology to study effect of deodorizationin laboratory scale, the result showed that the combination of the biotrickling unit and biological oxidation unit can remove low concentrations of VOCs effectivley. A pilot study was carried out for the typical odor sources of sewage treatment plants by biological technology. Results showed that biological deodorization technology can meet the requirements of odor control.The biological technology was applied to full scale odor treatment of five pumping stations and pre-treatment unit. The application detection results indicated that the removal efficiency of H2S, ammonia and VOCs were98.75%,97.9%å'Œ99.7%, respectively, meetig the design technical requirements. Through bench-study, pilot study and full scale study, the operation was evaluated and some problems were resolved resulting better removal effects. Finally, the current situation of odor gas treatment guideline and standard was discussed and some suggestion were proposed for improvement of standards. |
PDF Full Text Request