高分子凝聚劑處理淨水場高濁度原水成效之研究; Performance Study on Treating High Turbidity Raw Water with Polymer Coagulants at Water Treatment Plant

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Title:	高分子凝聚劑處理淨水場高濁度原水成效之研究;Performance Study on Treating High Turbidity Raw Water with Polymer Coagulants at Water Treatment Plant
Authors:	黃永富;Yung-Fu Huang
Contributors:	環境工程研究所碩士在職專班
Keywords:	攪拌強度;高分子凝聚劑;高濁度原水;廢污;淨水場;Water treatment plant;high turbidity raw water;polymer coagulents;mixing intensity;waste residues
Date:	2010-07-22
Issue Date:	2010-12-08 13:51:04 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究以板新淨水場為案例場，由統計資料得知，鳶山堰水源平均每年原水高濁度（>200NTU）發生天數達30.8天，三峽河水源為3.8天。每個颱風因豪雨造成鳶山堰水源高濁度平均為207小時；三峽河水源則受高濁度原水影響約23小時。板新場雙水源依高濁度原水產生不同延時特性，可擇優水質取水，減少淨水場高濁度原水發生時間，降低混凝沉澱單元負荷及衍生之廢污量。研究結果顯示，以單藥劑高分子凝聚劑(Polymer)或聚氯化鋁(PAC)處理成效不理想；以雙藥劑Polymer及PAC搭配處理，有較佳濁度去除成效。處理高濁度原水，增加快混攪拌強度，可以提升濁度去除率；慢混攪拌強度採分段遞減方式（G = 90 sec-1至30 sec-1），濁度去除效果較佳。250NTU原水，先加入PAC再添加Polymer，可獲得較佳濁度去除效果；原水濁度2,000NTU或10,000NTU，先加Polymer再加入PAC之處理方式，殘餘濁度最低。淨水處理添加Polymer衍生之廢污，經適量添加polymer調理後，可得到較佳的污泥濃縮及脫水性。 From the statistical data, this case study of Panhsin Water Treatment Plant indicated that an average 30.8 days and 3.8 days per year of high turbidity (> 200 NTU) raw water occurred at Yuanshanyan water source and Sanxia River water source, respectively. The high turbidity level at Yuanshanyan water source, which was caused by the heavy rains brought about by each typhoon, lasted for 207 hours on average. On the other hand, the extent of high turbidity at Sanxia River water source for each event was approximately 23 hours. The different time delay characteristics in accordance with the high turbidity occurred at the dual water source systems for Panhsin Water Treatment Plant. Allow to allocate the raw water intake between the two water sources at the time of better water quality in order to reduce the duration of high turbidity incidence at the water treatment plant, and to lessen the unit loading of coagulation/sedimentation process as well as the amount of derived waste residues. The experimental results of this study revealed that single-dose of polymer or poly-aluminum chloride (PAC) as coagulant for high turbidity raw water treatment was inefficiency to meet the goal of turbidity removal by coagulation/sedimentation process in the plant. When dual coagulants of polymer and PAC were added simultaneously, better efficiency of turbidity elimination was achieved. Increasing the intensity of rapid mixer for treating high turbidity raw water could enhance the turbidity elimination. The adoption of various velocity gradients decrease from the first compartment (G = 90 sec-1) to the last (G = 30 sec-1) of slow mixing tank would obtain a better residual turbidity. For raw water turbidity at 250NTU, a better turbidity elimination effect would be achieved if the PAC was added at rapid mix, followed by the polymer added at slow mix. When the raw water turbidities were 2,000NTU and 10,000NTU, adding polymer first and then PAC would resulted in better performance for turbidity removal. For the settled sludge derived from polymer coagulation of high turbidity raw water, the test results also revealed that the sludge properties of thickening and dewatering could be further improved by polymer conditioning.
Appears in Collections:	[Executive Master of Environmental Engineering] Electronic Thesis & Dissertation

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