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Particle Removal Evaluation with Bubble Column on Eel Breeding Circulation System
應用氣泡柱於循環水養鰻系統中去除顆粒之效率評估
摘要
本文應用氣泡柱操作參數因子，結合顆粒重量與顆粒粒徑分佈等兩種實測資料，求出不同粒徑範圍的去除效率，針對不同粒徑大小的懸浮性顆粒與要求的去除效率，推導出最佳操作因子，以利於養殖現場操作。實驗場地選擇—超集約式循環水養鰻系統，將氣泡柱架設於中大型顆粒去除設備之後，由實驗可得知：當入水流量增加或入氣流量降低時，顆粒去除效率隨之降低。且由靈敏度分析得知入氣量變化對處理效率影響較大。目前此組氣泡柱設備在控制操作參數下，最佳的操作參數爲入水流量4.23升／分，入氣流量15升／分時，其最佳的顆粒處理效率約爲35%，水力停留時間爲328秒。當處理目標顆粒範圍爲131至600μm之間時，水流量應控制在13升／分以下，當處理目標顆粒範圍爲131μm以下時，水流量控制在5升／分以下較容易去除。此兩種狀況的氣流量均應控制在7升／分以上較容易去除。建議設計用物質傳遞係數K(下標 T2)爲0.015至0.08間。若考慮串聯幾組氣泡柱處理設備，則可將未去除的殘餘顆粒做多次處理，以提高整體去除效率。
並列摘要
This paper applies for the parameters in the bubble column experiment along with two other indices, particle concentration and particle size distribution to find out the removal efficiency of different particle size so as to confer which is the best parameter. We use the super intensive circulation system with a bubble column behind the removal facility in medium size on the pond. We can conclude that the water and air infusion has great impact on removal efficiency. When controlled the two parameters, water infusion: 4.23L/min and air infusion; 15L/min., the removal efficiency is about 35% and water detention time is 328 seconds. If particle scope is between 131 and 600μm, we had better make water infusion remain under 13L/min while that is smaller than 131μm, water infusion under 5L/min. In both of air infusion remain above 7L/min. Besides, we suggest that it would be better apply for the mass transfer coefficiency, K(subscript T2), between 0.015 and 0.08. If putting removal system in series connection, then the remaining particles will be eliminated once again; as a result, the overall removal efficiency enhances.