This project gathered nitrogen removing techniques and related cases both in Taiwan and abroad, and the standards for controlling nutrients in effluent in public sewage systems in foreign countries, with their control items, methods, limits and characteristics summarized to be compared with the current control exercised in Taiwan, while conducting on-site inspection at eight selected public sewage treatment plants to understand the water quality of nutrients, efficacy of treatment and operation parameters at the plants. Also, the project summarized the real influent water quality at Taiwan’s public sewage treatment plants and drew up the draft of effluent standards for nutrients in public sewage systems and conducted analysis in the impact of the enforcement of such draft. We made statistics on the historical water quality and water use rate at public sewage treatment plants and analyzed the causes of low use rates. By 72 on-site inspections, we understood the water quality of domestic wastewater and intercept sewage and nightsoil dumping as reference for considering improvement strategies. We also completed the investigation in whether users retained the septic tanks when they connected the piping regarding legal specifications, the improvement on influent water quality at public sewage treatment plants, the improvement on environmental sanitation and subsequent costs. We gathered the methods of public sewage system management in foreign countries and drew up, based on the analysis in the causes of low water quality and water use rate, strategies for improving use rates. We projected total nitrogen pollution in domestic wastewater and selected prioritized areas to try nitrogen removal from domestic wastewater for 11 focused rivers, which are Tamsui River system, Nankan River, Laojie River, Juoshuei River, Beigang River, Xinhuwei River, Jishuei River, Yenshuei River, Eren River, Agongdian River and Love River; we also drew up short-term and mid-term strategies for total nitrogen reduction in domestic wastewater in line with the public sewage system plan and constructions. In addition, we promoted the Project of 2012 domestic wastewater reduction, sorted the common questions about community management with recommendations for improvement presented, contemplated on the exercise of taking operation parameters of aeration and sterilization units as part of the checking of community approval, assisted in the file creation of 93 cases of new application for registration of sewage treatment facility at prefabricated buildings and site inspection forms, and other executions as required.

domestic wastewater;public sewage systems;nutrient;effluent standards;pollution reduction strategies