| 英文摘要 |
Taiwan High Speed Rail has flourished the business and made the population in ChuBei grow up fast, which results to the increase in the discharge of municipal wastewater in the Dou-Zi-Pu River in Xin-Zhu County. Before the sewer system is in operation, municipal wastewater is discharged into Dou-Zi-Pu River directly. In order to decrease the pollution loading and odor of the Dou-Zi-Pu River was enhanced, ecological water purifying system is considered.
The project had chosen the 950-meter between the Ru-Lin Bridge and the Wu-Zhou-Liu Bridge in Dou-Zi-Pu River to be the site for the water purifying system. Water analysis shows that the main pollutant source in this area is the municipal wastewater, which comes from the sewage discharges from Wen-Ping Road, Wu-Zhou-Liu Road, and under the Han-Lin Bridge. The total amount of sewage discharge is 2480 CMD. To ensure the gravel oxidation beds can function properly, 400 CMD water is designed to drawn from the Dou-Zi-Pu River and to mix with some of sewage. So the designed total water flow rate is 2880 CMD.
2880 CMD municipal wastewater will pass the pretreatment processes, gravel oxidation bed and wetland. The water quality of the treated water are:
(1) Right side upper the river：BOD = 15.9 mg/L、SS = 14.6 mg/L、NH3-N = 14.9 mg/L
(2) Right side down the river：BOD = 20.7 mg/L、SS = 18.0 mg/L、NH3-N = 16.0 mg/L
(3) Left side upper the river：BOD = 14.9 mg/L、SS = 3.0 mg/L、NH3-N = 16.9 mg/L
(4) Left side down the river：BOD = 23.7 mg/L、SS = 5.0 mg/L、NH3-N = 19.1 mg/L
Total amount of reduction of discharged is 60.5 kg/day (22.1 ton/yr) of BOD5, 73.3 kg/day (26.8 ton/yr) of SS, and 16.5 kg/day (6.0 ton/yr) of NH3-N. The budget for the construction and maintenance is about $58,951,405 NT dollars.
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