水質淨化劑降低水中固形物濃度之效率研究

Abstract

人類生活環境中，存在多數流動性低、小空間之景觀水池，隨著藻類增生、水中耗氧量增加，易導致水質劣化，產生惡臭、透明度下降，甚至危及水生生物存活等問題。需有省時、省人力、有效的改善水質方法，保持景觀水池之穩定環境。 本研究適用之環保水質淨化劑，以台大的醉月湖及瑠公圳的底泥水進行現場實地計測與實驗室實驗。設計一型蜂巢捕集器收集固形物沉降物，探討使用高、中、低劑量之水質淨化劑對於淨化水中固形物之效率，分別以濁度變化、透明度變化、沉澱物捕集速率等變化作比較。 研究結果顯示，不論在現場試驗或是設計實驗，散佈低劑量水質淨化劑最能有效率淨化水質。其作用效果在初期數日表現良好，能有效降低濁度、提升透明度、減少懸浮數量等。不論原水池濁度高低，以水質淨化劑散佈後4天，即開始產生絮聚結塊物。本研究結果得知每平方公尺底泥面積散佈302g之低劑量水質淨化劑為建議散佈量。希望以此研究結果，作為提供國內湖泊、水池等改善水質工作方案之一。

Many area, shallower landscape ponds are lower flow, easy to cause water quality degradation, odors, lower transparency, and even endanger aquatic life. An effective methods for improving water quality is needed to maintain a stable environment for landscape ponds. An environmentally-friendly water quality purifier was used in field experiments and laboratory tests at Drunken Moon Lake and Liou Gong Waterway, Taiwan university. A trap was made to collect the absorbed suspended solids. Purification efficiency were compared with the changes of turbidity, transparency, and sediment capture rate. The results show that, in both field and design experiments, the low-dose water quality purifier is the most efficient way to purify water. Its effect is good in the early stage, it can effectively reduce turbidity, improve transparency, reduce the number of suspended solids, etc. Regardless of the turbidity of the original pool, the agglomerates began to settle in 4 days after the water quality purifier was dispersed. According to the results of this study, a low-dose water quality purifier with a dosage of 302 g per square meter of sediment area is the recommended amount. It is hoped that this research result will provide one of the work plan to improve domestic lakes and pools water quality.