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題 名 | 效能佳淨水前處理技術之研究=Efficient Research on Water Pretreatment |
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作 者 | 蔡景松; | 書刊名 | 東南學報 |
卷 期 | 34 2009.07[民98.07] |
頁 次 | 頁197-206 |
分類號 | 445.25 |
關鍵詞 | 沉澱; 高濁水; 微氣泡浮除; Sedimentation; High turbidity raw water; Nano-sized bubble flotation; |
語 文 | 中文(Chinese) |
中文摘要 | 摘 要 台灣地區近幾年來颱風暴雨期地面水濁度飆高,造成淨水處理困難,本計畫研究 尋求可行之效能佳處理技術。由於高濁水所含懸浮固體物特性為影響處理效果之主要 因素,雖然高濁水所含懸浮固體物顆粒微細化,但仍以易沉降物質居多,混凝沉澱仍 為效果較佳之處理方式;濁度越高,其競爭性越高。但為維持處理效果,傳統沉砂池 停留時間需延長,混凝機制須強化,沉澱排泥效率需提高。高濁水發生期間,為避免 整廠淤積堵塞而停擺,混凝沉澱之前須有緩衝前處理,並監控進入混凝沉澱單元之濁 度須小於1,000NTU,進入快濾單元之濁度須小於30NTU。沉砂池、混凝沉澱及浮除均 可作為前處理設施,然而以高濁度為單一處理目標,浮除由於成本偏高、操作不易, 對混凝沉澱不具競爭性;但其等兼具重金屬、色度、藻類等其他物質去除之優勢,建 議未來在提升自來水水質目標下,併同其他水質成分處理需求做整體之評估其適用 性。本研究進行微氣泡浮除處理高濁水之模場試驗,其結果顯示在氣固比及加藥量適 當控制之下,濁度去除率可達80 %。 |
英文摘要 | Abstract Soaring turbidity in typhoon and storm season causes water treatment problems in Taiwan recently years. This research tries to find efficient solutions for practice. Because of the performance is affected by the type and characteristics of suspended solids primarily. Although more fine in particle size but easy precipitation by high density, sedimentation still is the best treatment process for high turbidity raw water. And the greater the solids concentration, the more likely it is that horizontal-flow sedimentation will be better. But the grit chambers need longer detention time, strengthened coagulation process and high efficient sludge drain system are needed for sedimentation too. Preventing the whole plant suspended by clogging or silting up, the pretreatment is essential for high turbidity raw water. And the influent turbidity should be monitored not over 1,000NTU for chemical sedimentation and not over 30NTU for rapid filters. For turbidity subject, flotation can not be competitive with chemical sedimentation by high cost and operation difficulties. But for better treatment effects on water contain heavy metal、algae blooms and colored water, they still have the potential for higher water quality goal in the future. According to the results of Nano-sized bubble flotation pilot study, suitable air/solid ratio and coagulant dosage can get 80% turbidity removal rate. Keywords: |
本系統中英文摘要資訊取自各篇刊載內容。