| 英文摘要 |
The project measured and monitored the water quality, flow rate, sediment and biology conditions at the 1st and 2nd phases of ecological treatment area of the Tou-Chian river flood plain, the 3rd and 4th phases of ecological treatment area of the Tou-Chian river flood plain, the 5th phase of ecological treatment area of the Tou-Chian river flood plain, and the ecological treatment area of the flood plain of left bank of the Feng-Shan river.
The water quality, flow rate, sediment, and pollutant reduction rate were analyzed in this year. The reduction rate of Biochemical Oxygen Demand (BOD), Suspended Sediment (SS), Ammonia Nitrogen, and total Phosphorus were significant during Jan. to Dec. for the 1st and 2nd phases of ecological treatment area of the Tou-Chian river flood plain. The BOD reduction rate was significant while the other items were not significant at the 3rd and 4th phases of ecological treatment area of the Tou-Chian river flood plain due to it takes the water from the Chu-Dong water treatment plant. The items at the 5th phase were also significant reduction rate. However, the sediment removal at the 5th phase was recommended for a better SS reduction rate. The BOD, SS, Ammonia Nitrogen, and total Phosphorus reduction rate at the Feng-Shan river was significant from Jan. to May, not significant in June and July.
The sediment sampling and analysis have been completed during the year, in which the redox potential range between-200mV to-395mV, the pH value is between 7.0 to 7.2, and the organic matter content of 1.5 to 7.0 percent. The A pool of the 3rd and 4th phase accumulated the lowest concentrations of sediment organic matter; while the A pool at phase 1 and 2 have the highest. The highest values of nitrogen and phosphorus content also appear in the phase 1, 2 A pool of 3,680 mg / Kg and 434mg/Kg, respectively, followed by phase 5 A pool, a minimum of phase 3 and 4, A pool. The copper and zinc content were 255mg/Kg 712mg/Kg at phase 1 and 2 which is higher than the upper limit of sediment quality indicators (157mg/Kg, and 384mg/Kg). The phase 5 A pool of copper and zinc content were 15.3mg / Kg and 76.5mg/Kg, below the lower limit of sediment quality indicators (50mg/Kg, and 140mg/Kg); phase 3 and 4 A pool and phase 5 A pool the total chromium content were 26.9mg/Kg and 22.8mg/Kg, which were lower than the lower limit sediment quality indicators (76.0mg/Kg) the same reason lead content 44.5mg/Kg and 17.0mg/Kg which were lower than the lower limit of sediment quality indicators (48.0 mg / Kg).
Two biological Survey were implemented in summer and winter in this year. The survey recorded 65 families and 164 species of vascular plants, 22 families and 37 species of birds, 3 orders, 4 families and 9 species of mammals, amphibians and reptiles, 2 orders, 8 families, 11 species of butterflies and damselflies class2 mesh 9 families, 36 species, 12 kinds of fish orders, 6 families, the benthos 5 orders, 9 families 11 kinds of aquatic insect orders, 7 families, four planktonic animals of 22 species of planktonic algae 65 species. Compared with the results of previous ecological surveys, the overall number of species had few changes in the governance area that means the ecological environment has been stabilized, and be able to attract more biological habitat in the governance area.
In this year, three times of the ecological education advocacy and ecological guided tour were implemented on April 16 to 17, May 26 and November 9, respectively. In addition, the “environmental education site and facility verification” application and the video of “environmental education teaching materials” has been completed in this year and has passed the procedure review and paper work examination by the EPA.
According to the monitoring data and analysis of the results of the current year, ecologically recommended increasingly replacing exotic plants with native species of plants. In the area of water management, it is recommended that cleared the mud at the end of next year, you can check there is no leakage or infiltration, monitoring can be reduced to the stream and a water volume of error.In water quality improvement easier, it is recommended that clear, 3rd and 4th period and 5th period sediments, improves SS removal rate; 3rd and 4th period can be reduced to the stream of water entering, to provide enough water purification processing time.
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