| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 96 === The flood that occurred on July 11, 2001 has caused a great property loss and harmed the security of the National Kaohsiung First University of Science and Technology (NKFUST). In order to detain and/or to prevent floods as well as to provide ecological restoration, the NKFUST has established an ecological reservoir that is three hectares in size. It is utilized to purify the secondary effluent from wastewater plant which is used to process the wastewater drained from the dormitory and pollutants from non-point source pollution. The tertiary treatment carried out by a wetland ecological system consumes low energy. After integrating the dual water supply system constructed in the rain-water storage utility, the amount of tap water used for non-contact purpose can be reduced by reusing grey water to achieve sustainable water resource recycle and reuse strategy. The study is focus on the case of NKFUST constructed wetland and aims to investigate water quality as well as to evaluate the habitant environment in the reservoir so that the maintenance and management strategy can be well planned. It is hoped that a sustainable and diverse constructed wetland can be established.
The water quality variations were analyzed four years after this wetland has been established. Results from the survey of one and a half years indicated that the removal rate of biological oxygen demand (BOD) ranged 11.4~97.8 % (mean: 51.8 %) after secondary treatment. After water purification by the integration of secondary and tertiary treatment, the removal rate of BOD increased to 66.0~97.8 % (mean: 89.8 %). The removal rate of ammonia nitrogen (NH3-N) increased from 55.7 % to 84.8 %. The removal rate of suspended solids (SS) was raised from 73.8 % to 88.5 %. The average BOD concentration of effluent from the proposed wetland system was reduced to 5.65mg/L which is lower than the value of water quality standard recommended in the Taiwanese grey water system. That is BOD < 10mg/L. The average concentrations of NH3-N, SS, and dissolved oxygen (DO) were 1.85 mg/L, 5.53 mg/L, and 5.9 mg/L, respectively. The effluent concentration of DO was higher than 5.5 mg/L met the Class II water quality standard for surface water body. The density of coliform groups was between 10~4900 CFU/100mL (mean: 3597 CFU/100mL) also met the Class II surface water body quality standard, i.e. <5,000 CFU/100mL. After purification, effluent integrated with the dual water system constructed in the rain-water storage utility can provide non-contact water for the West campus of the NKFUST.
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