| Abstract |
| The supply of sewage treatment facility in rural areas is important to protect the quality of water sources such as rivers and lakes. A small scale wastewater treatment system had a wide range of inflow concentration. Therefore, it is important to accurately identify the characteristics of the influent and respond properly to operate the system stably. Hence, research has been conducted on methods to detect and respond in advance to the influent sewage. The method includes studying of microbial respiration rate. In this study, we analyzed the respiration rate of activated sludge in the condition that the microorganism became autocatalytically oxidized under an empty load condition, and the sewage containing the toxic substance(NaOCl) was the biggest problem of the distributed small-scale sewage treatment plant(D-SSTP). Oxygen Uptake Rate (OUR), Specific Oxygen Utilization Rate (SOUREndo.), and Specific Substrate Utilization Rate (SSUR) were measured and analyzed. As a result, The concentration of DO did not affect the autocatalytic oxidation of microorganism. Moreover, as concentration of NaOCl increased, concentration of SOUREndo tends to decrease as expected. Also, the increase in concentration of NaOCl resulted in the decrease in that of the SSUR. It is determined that NaOCl injection affects the microbial activity. |
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| Key Words |
| Activated Sludge, Autocatalytic oxidation, Distributed small-scale sewage treatment plant, Microbial activity, Specific Oxygen Utilization Rate(SOUREndo.), Toxic substance |
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