Er-Jen River has been polluted for a long time by industrial, live stock and domestic waste water from Tainan County, Tainan City and Kaohsiung County. In the past few years, various agencies have devoted their effects in water pollution presentation and improvement, however, there are not much difference in water quality due to lack of effective project conformity leading to different actions and unclear obligation of each agency. The project entitled “Restoration Vision of Water Environment for Er-Jen River” was formed in 2005 to establish short-term, mid-term and long-term goals of Er-Jen River water quality improvements. The project was to review all related planning results in the past and to collate and review all projects completed by various agencies. In addition, improvement results were evaluated for future modification of improvement plans.
This project is the continuation of the project formed in 2005. Main items of this project include continuation of establishing hydrological and water quality background data, analyses of Er-Jen River water quality improvement benefits, development of facture improvement measures, establishment of management system for the retraction vision, and collate and review all related projects completed by various agencies.
According to water quality monitoring results in 2006, Er-Jen River is still classified as mid to severe polluted river, especially in the reaches adjacent to Er-Ceng Bridge, Gu-Ting Bridge and Er-Ceng-Hang Bridge with major pollutants of BOD and NH3-N. The monthly water quality indicated that water quality in wet season (May to September) is better than those in day season with the best water quality in August.
During the course of this project, evaluations are conducted by water quality simulation model for the completed water quality improvement sites including Hu-Wei-Liao waste water treatment plant and first phase of the Shan-Ye creek water quality improvement site. This project has also made recommendations to over all improvement for mid-term and long-term work items including privation of water quality improvement at Shen-Keng-Zi Creek site or alternative measure, and the promotion of planning of other water quality improvement sites. As for Shan-Ye creek, since it flows through populated area, it is recommended to have effective measures for water quality improvement to provide better living quality of Er-Jen River begin.
The analyzed results of the nine expecting and future water quality improvement sites indicate that BOD can be reduced by 49% in Er-Jen River. The remaining pollutant reductions have to relay on the completion of Gui-Jen and Jen-Te sewer systems and investigation of live stock and industrial waste water effluents. At the present time, most of the patrol are located at populated area, it is recommended that more patrol should be located at up stream reaches of Shen-Keng-Zi Creek and Gang-Shan Creek.
A management system of Er-Jen River Restoration Vision was established and a training course was given in this project. A management web site was also established for front-end application system and rear-end execution system to provide connection by various agencies for data searching and reporting as well as information announcement and data renovation.
In addition to above mentioned works, this project has assisted the client to hold three coordination meeting, one inspection meeting by the Director of EPA, and numbers of review meeting to collect related projects by various agencies. It is recommended that major pollution sources in the river bank should be identified, especially landfill sites, and assist the planning of water quality improvement construction works to achieve the water quality improvement goal. In addition, sewer systems should be constructed as soon as possible to reduce pollutant that was flowed into Er-Jen River.
The water quality improvement in Er-Jen River has had some preliminary results after implementation of improvement creeks by various agencies. In the future, the results of this project should be used as a foundation to reach the environmental restoration vision.