Performance Evaluation of Using Solar Power Artificial Floating Island on Aquatic Water Quality and Ecological

• Main Authors: Ku, Chen-Ruei, 古宸瑞
• Other Authors: Chang, Yuan-Hsiou
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/13499991158338923654

碩士 === 明道大學 === 設計學院碩士班 === 101 === Focusing on water purification and ecological conservation, this study combined green energy and vegetation ecological engineering purification equipment to realize the landscape, environmental protection, sustainability and ecological achievements. As the natural purification efficiency of the conventional artificial floating islands is excessively too low to affect ecological conservation. In view of this, in this study, to explore the performance of solar energy artificial floating islands in ecological and water quality improvement, we established the experimental model field along the banks of the Lize Lake on the campus of MingDao University in Changhua County by introducing water from surrounding waters and the dormitory drainage as the source for sewage water purification. Three water troughs in depth of 165cm, diameter of 130cm, and total water content of 2 tons are constructed inside the experimental field as the experimental containers. The solar energy artificial floating islands are sized of 60×60cm, and the net cage is sized of 20×20cm. Typha orientalis Presl, Eleocharis dulcis and Juncus effuses are used as the vegetation purification plants while brush and charcoal are used as the biological filtering materials. The solar power generation part is combined with the aerobic equipment. As suggested by the preliminary results, the solar energy artificial floating islands can effectively break the water layers to homogenize the quality of the water and inhibit the growth of algae. The DO water body using the solar energy artificial floating islands E has been improved by 92.6 times as compared to the control group water body F without using the solar energy artificial floating islands; in terms of pH range, the pH of water body E can be maintained in 7.5~8.5. By contrast, the pH range of water body F is 7~9.5; The ORP of water body E improves 38.8 times and 25.7% as compared to water body F; the ammonia nitrogen and nitrate nitrogen removal rates of water body E are 95.9% and 85.3%, being higher than water body F at 43.2% and 82.3% respectively, the removal rate of ammonia nitrogen improves by 52.7%, the SS removal rate of water body E is 86% and that of water body F is 37%, resulting in the gap of 49%; the COD removal rate of water body E is 100% while that of water body F increases by 2.89 times. As suggested by the ecological survey results, there are 19 types of insects in water body D and 16 types of insects in water body E. The representative species is Hierodula patellifera; the algae indicative species are mainly of Synedra ulna (Nitzsch.) Her. and Spirogyra. Hence, it is determined that water body D is non/slightly polluted, water body E is non/slightly polluted, lightly polluted; the benthic insects and biological indicator results are mainly of Libellulidae, Coenagrionidae, Leptophlebiidae, hence, it is determined that water body D is non/slightly polluted, lightly polluted, water body E is lightly or moderately polluted. In summary of the experimental results, it can be found that the solar energy artificial floating islands can rapidly enhance water quality and ecological performance to improve waters and land environmental biological diversities and species individual numbers and sizes. Hence, it is worth the promotion and application. The range of applications covers areas as small as campus, community pond and as large as coast, lake, reservoir to provide waterway landscape and ecological conservation facilities.