Abstract
The reuse system of city domestic wastewater are now coming to be rather popular in Tokyo metropolitan area. In the water quality aspects of reuse of treated wastewater, the remained odor problem is one of the most urgent ones to be solved. The purpose of the present study is to initiate the first step to identify the odorous substances themselves, to find the main source of production of the odorous substances, and to investigate the efficient methods of removal of the odorous substances.
It has been reported that the principal odorous substances from sewage treatment plant are sulfur compounds. Gas chromatography with flame photometric detector (FPD), which is sensitive to sulfur compounds, was used for the chemical analyses of the odorous substances, Analyses of head-space gas showed that sulfur compounds were sharply removed through an aeration tank and sludge treatment processes were related to production of odorous substances. Using a purge & trap concentration method, sulfur compounds such as methyl mercaptan, dimethyl sulfide, and dimethyl disulfide are isolated and identified from the final effluent of the conventional activated sludge process. For the removal of the odorous substances, the aerated filtration of the activated carbon bed was found to be effective.
