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|其他題名: ||Water purification of freshwater aquaculture|
|Issue Date: ||2020-03-24 12:01:48 (UTC+8)|
|Abstract: ||本研究於台南學甲設置一淡水魚塭水質淨化試驗場，利用外加之水質淨化池及池中培養淡水的水生植物以循環淨化養殖池之水質，水質淨化池之水力停留時間約1.12小時。魚塭水質以多參數水質監測儀器每週監測一次，監測項目包括溶氧、pH、水溫、導電度及氧化還原電位，並定期採樣檢測水中之氨氮、懸浮固體物、濁度及亞硝酸鹽氮濃度，藉以評估淨化系統之水質淨化效能。本研究所採用的水質淨化植物依試程分為三種，試程一所培養的水生植物為挺水性之大安水蓑衣，試驗期間自2016年夏季至冬季，試驗期間，淨化池出流水懸浮固體物濃度介於10.0至44.0 mg/L之間，平均值為25.9 mg/L(RSD=25.1%， n=12)，與進流水比較，平均去除率為27.9%。試程二所培養的水生植物為沉水性之金魚藻，試驗期間自2017年夏季至冬季，研究結果顯示，金魚藻對於氨氮有去除效果，淨化池出流水氨氮濃度介於0.05至0.21 mg/L之間，平均值為0.068 mg/L(RSD=63.9%，n=19)，與進流水比較，平均去除率為11.7%，但金魚藻因其生物量小，對於雜藻強勢生長遮蔽陽光缺乏競爭力，無法持續地降低試驗池的懸浮固體物濃度及濁度。試程三所培養的水生植物為浮水性之布袋蓮，試驗期間自2018年夏季至秋季，試驗期間對於溶氧的提升、亞硝酸鹽氮濃度的下降效果最為顯著，淨化池出流水溶氧濃度介於5.96至10.8 mg/L之間，平均值為7.82 mg/L(RSD=24.1%，n=6)，與進流水比較，平均上升了13.8%，淨化池出流水亞硝酸鹽氮濃度介於0.09至0.55 mg/L之間，平均值為0.40 mg/L(RSD=46.0%，n=6)，與進流水比較，平均去除率為13.0%。經過三個試程的研究結果顯示，目前採用的水質淨化系統對於淡水魚塭水質淨化效果並不明顯，未來的研究建議採用較長的水力停留時間，較低的水深，及設有擋板的水質淨化渠以提升水質淨化效能。|
In this study, a freshwater fish farm in Xuejia, Tainan, with an area of 2,060 m2 and a depth of 1.5 m, was used for the investigation of water purification. total of two identical channels with an effective volume of 3.3 m3, and a hydraulic retention time of 1.12 hr was used for the purification of contaminated fish farm water. The water purification system was powered by a 1 HP pump. Different aquatic plants were grown to purify the fish farm water, including emergent plant Da’an water jacket (Hygrophila pogonocalyx Hayata, 2016 test run); submerged aquatic plant hornwort (Ceratophyllum demersum L., 2017 test run); and floating aquatic plant water hyacinth (Eichhornia crassipes (Mart.) Solms, 2018 test run). In water quality monitoring programs, dissolved oxygen, pH, water temperature, conductivity, redox potential, ammonia nitrogen, suspended solids, nitrite nitrogen, and turbidity, were measured weekly to evaluate the performance of water purification.The results obtained in this study indicated improvement in water quality. During the 2016 test run, Da'an water jackets was used to purify the water, and SS levels in the influent ranged from 10.0 to 44.0 mg/L with an average level of 25.9 mg/L (RSD=25.1%, n=12). After treatment, performance of suspended solid removal was 27.9% During the 2017 test run, Hornwort was used to purify the water, and the ammonia nitrogen levels in the influent ranged from 0.05 to 0.21 mg/L, with an average level of 0.068 mg/L (RSD=63.9%, n=19). After treatment, performance of ammonia nitrogen removal was 11.7%. However, owing to strong growth of algae, hornwort was not able to become dominant. During the 2018 test run, water hyacinth was used to purify the water, and dissolved oxygen in water increased from 6.08 mg/L to 7.82 mg/L. After treatment, the level of nitrite nitrogen decreased from 0.46 mg/L to 0.40 mg/L, performance for nitrite nitrogen removal was 13.0%.The results obtained in this study indicated that the present system do not have good performance for the purification of freshwater aquaculture. A purification channel with longer hydraulic retention time and lower depth of water are suggested.
|Appears in Collections:||[環境工程系所] 博碩士論文|
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