Pharmaceutical substances, which are micropollutants released into the natural water system, unlike other micropollutants whose concentration in the water environment gradually decreases due to regulation of use and manufacture, it is predicted that the usage will increase due to aging of the popula...
Pharmaceutical substances, which are micropollutants released into the natural water system, unlike other micropollutants whose concentration in the water environment gradually decreases due to regulation of use and manufacture, it is predicted that the usage will increase due to aging of the population and increase of chronic diseases(non-infectious diseases). It is widely used not only for human medicines but also for animal husbandry and fish form fields, and the amount of pharmaceutical substances used is increasing every year. However, the processing steps of the domestic wastewater treatment plant that is pretreating the current effluent water use more than 95% conventional biological treatment process, so it is judged that there is a limit to removing micropollutants such as pharmaceutical substances. This study was carried out to complement and improve currently used biological processes, to improve the processing efficiency of micropollutants in the future, and to present the optimal management direction.
In this study, two sites in the domestic wastewater treatment plants were set as the survey target sites. We studied and analyzed the monthly flow rate variations, general water quality constituents variations, concentration variations of the pharmaceutical substance, and the removal rate variations of pharmaceutical substance by process. However, spike damage experiment was conducted because it was shown that it is difficult to clearly evaluate the removal characteristics of pharmaceutical substances at trace amount level.
In the biological process, all pharmaceutical substances tended to decrease in concentration while passing by the bioreactor.
However, it was judged that it was difficult to decompose a trace amount of a pharmaceutical substance only by a biological process, since the removal rate of the remaining pharmaceutical substances except Acetaminophen appeared less than 50%. Therefore, in order to investigate the throughput due to oxidation by ozonization and investigate appropriate operating conditions, experiments were conducted with dissolved ozone concentration of 1, 3, 5 mg / L. As a result, ozone injection concentration for economical removal was 3 mg / L. In order to operate economically, the adsorption process mixed activated carbon and soil was introduced after the ozonation process, and the optimum injection rate of activated carbon was examined at 30% and the optimum EBCT was examined at 10 minutes. Therefore, by combining each single processing process, a continuous process was introduced into the pilot and analyzed according to the optimal treatment process of the pharmaceutical substance.
As a result, Acetaminophen appeared removal rate of above 99% in the biological treatment process, and Trimethoprim showed relatively high removal rate of 70% because of high molecular weight but high adsorption rate. Carbamazepine, Sulfamethoxazole and Diclofenac which are the three target pharmaceutical substances were found less than 50%. After ozonization of the latter process, the throughput of Acetaminophen appeared more than 99%, the Trimethoprim was more than 80%, and the remaining three pharmaceutical substances also had high throughput of 50 to 80%.
Then, after passing through the adsorption process of the latter stage of the ozone process, the removal rate of the remaining three medicinal substances was as high more than 80%, and it was possible to expect stable treatment of all trace pharmaceutical substances. In particular, in each single process, the pharmaceutical substance which is difficult to stably remove. But showed a removal rate of more than 80% in the continuous process of biological, ozonization and adsorption, so stable treatment could be expected. Therefore, by adding oxidation and adsorption process to the existing sewage treatment facility, it is judged that it can effectively remove trace amount of pharmaceutical substance. In future, we will try to present it as the basic material of the direction of management for pharmaceutical optimal removal.
Pharmaceutical substances, which are micropollutants released into the natural water system, unlike other micropollutants whose concentration in the water environment gradually decreases due to regulation of use and manufacture, it is predicted that the usage will increase due to aging of the population and increase of chronic diseases(non-infectious diseases). It is widely used not only for human medicines but also for animal husbandry and fish form fields, and the amount of pharmaceutical substances used is increasing every year. However, the processing steps of the domestic wastewater treatment plant that is pretreating the current effluent water use more than 95% conventional biological treatment process, so it is judged that there is a limit to removing micropollutants such as pharmaceutical substances. This study was carried out to complement and improve currently used biological processes, to improve the processing efficiency of micropollutants in the future, and to present the optimal management direction.
In this study, two sites in the domestic wastewater treatment plants were set as the survey target sites. We studied and analyzed the monthly flow rate variations, general water quality constituents variations, concentration variations of the pharmaceutical substance, and the removal rate variations of pharmaceutical substance by process. However, spike damage experiment was conducted because it was shown that it is difficult to clearly evaluate the removal characteristics of pharmaceutical substances at trace amount level.
In the biological process, all pharmaceutical substances tended to decrease in concentration while passing by the bioreactor.
However, it was judged that it was difficult to decompose a trace amount of a pharmaceutical substance only by a biological process, since the removal rate of the remaining pharmaceutical substances except Acetaminophen appeared less than 50%. Therefore, in order to investigate the throughput due to oxidation by ozonization and investigate appropriate operating conditions, experiments were conducted with dissolved ozone concentration of 1, 3, 5 mg / L. As a result, ozone injection concentration for economical removal was 3 mg / L. In order to operate economically, the adsorption process mixed activated carbon and soil was introduced after the ozonation process, and the optimum injection rate of activated carbon was examined at 30% and the optimum EBCT was examined at 10 minutes. Therefore, by combining each single processing process, a continuous process was introduced into the pilot and analyzed according to the optimal treatment process of the pharmaceutical substance.
As a result, Acetaminophen appeared removal rate of above 99% in the biological treatment process, and Trimethoprim showed relatively high removal rate of 70% because of high molecular weight but high adsorption rate. Carbamazepine, Sulfamethoxazole and Diclofenac which are the three target pharmaceutical substances were found less than 50%. After ozonization of the latter process, the throughput of Acetaminophen appeared more than 99%, the Trimethoprim was more than 80%, and the remaining three pharmaceutical substances also had high throughput of 50 to 80%.
Then, after passing through the adsorption process of the latter stage of the ozone process, the removal rate of the remaining three medicinal substances was as high more than 80%, and it was possible to expect stable treatment of all trace pharmaceutical substances. In particular, in each single process, the pharmaceutical substance which is difficult to stably remove. But showed a removal rate of more than 80% in the continuous process of biological, ozonization and adsorption, so stable treatment could be expected. Therefore, by adding oxidation and adsorption process to the existing sewage treatment facility, it is judged that it can effectively remove trace amount of pharmaceutical substance. In future, we will try to present it as the basic material of the direction of management for pharmaceutical optimal removal.
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