A STUDY ON NUTRIENTS SUPPLY FUNCTION OF SEWAGE TREATMENT PLANTS BY USING OPEN DATA.

Abstract

 Using open data, the nutrients supply function (active management) of the sewage treatment plant was comprehensively evaluated with the energy recovery function using a sewage treatment plant simulator, According to the calculation using the operation data in winter, which is the target of seasonal operation, the nitrogen concentration (NO₃-N) in the treated water increased to 10-13 mg/L and the nitrogen supply increased by 62% in the denitrification suppression operation. In the nitrification suppression operation, the treated water nitrogen concentration (NH₄-N) increased to 12-15 mg/L, and the nitrogen supply increased by 85%. The electric power consumption increased slightly in the denitrification suppression operation and decreased in the nitrification suppression operation. By introducing the active management method of "Always suppress nitrification +Duckweed culture", 16-20 mg/L of nitrogen could be supplied in the winter under the condition of nitrogen recovery rate of 70%, and the nitrogen concentration of discharged water was 5.3 mg/L by calculating from the annual discharge load. On the other hand, the annual average power generation was 39,670kWh/day, and the power self-sufficiency rate was 104%, so it was estimated that the power independence could be achieved even in a year.