| Summary: | 碩士 === 國立中山大學 === 海洋環境及工程學系研究所 === 105 === In the past, the Taiwanese government was committed to implementing industrial development policies that emphasized economic development. These policies subsequently led to the destructions of Taiwan’s ecology. However, the rise of domestic environmental awareness and industry transformations have gradually increased people’s attention to measures that protect the environment, in which the concept of artificial wetlands serves as one of these measures. Artificial wetlands are mainly divided into constructed wetlands and created wetlands. Constructed wetlands are artificial wetlands that have been ameliorated by improving their water quality. By contrast, created wetlands are wetlands that entail recovering ecological habitats or creating nature-like biological habitats to provide or replace existing biological habitats. The Yuanzhonggang Wetland Park is a wetland park located in Nanzi District, Kaohsiung City. Because the region is located next to an area to be built into a second-generation naval ship base, the construction of the naval ship base will inevitably exhibit an effect on the habitat environment. Therefore, the Yuanzhonggang wetlands are classified and positioned as “compensatory” created wetlands and efforts to recover their ecological habitats have been made accordingly. The goals are to recover mangroves, emphasize the use of native tree species, and serve the functions of flood control, water purification, landscape-based recreation, and ecological education. Located in the Nanzi District, Kaohsiung City, the Yuanzhonggang Wetland Park measures 29.41 ha and is divided into an east and west region by the Nanzi Wastewater Treatment Plant. The east and west wetlands are freshwater and brackish water-type ecosystems, respectively, in which the water for the east region primarily comes from secondary effluents discharged by the Nanzi Wastewater Treatment Plant. The said effluents are subsequently purified by constructed wetlands before being released into the Dianbao River. The west region is located in the tidal river section of the Dianbao River estuary, where brackish water of the Dianbao River flows into the Yuanzhonggang Wetland Park at high tide. In this study, water purification results of the constructed wetlands in the east and west regions were assessed to determine whether they achieved the desired effectiveness. Water purification samples were collected once a season, where spring and neap tides were obtained at high and low tides and analyzed for water quality including their biochemical oxygen demand (BOD) as well as ammoniacal nitrogen, total Kjeldahl nitrogen, nitrite, nitric acid, orthophosphate, total phosphorus, and total carbon contents. The results of the east and west regions were subsequently compared. According to the results, of the four seasons, constructed wetlands of the east region and created wetlands of the west region displayed the most optimal pollution removal effect in the hot seasons (i.e., summer and fall). For spring and neap tides at the west outlet, total phosphorus concentration at spring tide (i.e., 0.88 mg/L) was higher than that at neap tide (i.e., 0.61 mg/L), and total nitrogen was higher at neap tide (i.e., 17.39 mg/L) than at spring tide (9.86 mg/L). For high and low tides at the main West pool, total phosphorus concentration at high tide (i.e., 0.71 mg/L) was higher than that at low tide (i.e., 0.64 mg/L), and total nitrogen was higher at high tide (i.e., 14.45 mg/L) than at low tide (10.99 mg/L).
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