台灣地區自來水原水有超過65 %以上之比例來自水庫水，加以優養化之情形日益嚴重，故藻類在水庫水內之繁殖非常普遍。藻可引起臭味及藻毒等水質問題。在淨水程序上，藻體如未在混凝、沉澱時去除，有些藻種可能阻塞濾床。有些則可貫穿濾床，存在於清水中，而引起配水管網內水質惡化之問題。
本研究係以Navicula sp.(舟型藻-矽藻)和Microcystis sp.(微囊藻-藍綠藻) 兩種純藻分別配製人工懸浮藻液，以0.015M NaClO4為背景鹽，試驗結果顯示以高錳酸鉀為前氧化劑，對後續之單純沉降或混凝沉降之藻體去除效果，均較臭氧為前氧化劑者佳。以探討臭氧及高錳酸鉀為前氧化劑，及有無鈣硬度存在時，對後續藻體單純沉降及混凝沉澱 (以明礬為混凝劑)除藻效果之影響。
將矽藻人工藻液添加鈣硬度時，高錳酸鉀部分，可使上澄液殘餘藻數明顯降低許多。臭氧部分，其上澄液殘餘藻數仍會降低，其效果不及添加高錳酸鉀者明顯，但皆比未添加鈣硬度組來的好。無論是否有氧化劑或添加鈣硬度，藍綠藻皆會隨著時間的增加而上浮。
當添加鈣硬度時，藍綠藻上浮情形仍就不變。有添加Ca2+和高劑量KMnO4之藻液，開始變色，由淡紫色轉變為黃綠色。推測是因MnO2吸附在藻體上，MnO2本身為黃褐色，且因添加Ca2+，鈣離子經由架橋(bridging)作用，而促進帶負電之MnO2，吸附於帶負電之藻體上。
藉由 SEM觀察，高劑量的臭氧加量下，矽藻的藻體會破裂並造成NPDOC值增加，藍綠藻外面所包裹的黏質層 也會遭受破壞，部分藻體細胞會脫離，出現在黏質層外部，其NPDOC值也明顯上升。

In Taiwan, over 65% of source water for public water supply is from reservoir. Owing to eutrophication, the growing of algae in the reservoir is quite common. Algae can cause water quality problems such as taste and odor and/or toxicity. During water treatment, if algae are not removed by coagulation and sedimentation, some species may clog filter. Some algae cells can penetrate filter media, and cause water quality deterioration in distribution system.
In this study, two pure-cultured species, namely Navicula sp. (diatom) and Microcystia sp. (blue-green algae) were used to prepare algal suspension with background ionic strength provided by 0.015 M NaClO4.The effect of preoxidation by ozone and potassium permangate, and the existence or not of calcium ion on algae cells settling and their coagulation and sedimentation was focused.
The results show that potassium permangate was more effective than ozone for diatom cells settling and their coagulation and sedimentation by alum. When calcium ions were added into the algal suspension, the residual algal cell concentrations in the supermatants after settling were reduced, no matter that preoxidants were used. However, this phenomenon was more prominent for potassium permangate than ozone. For blue-green algae, the cells always float, it did not matter if preoxidant or calcium ions were added or not. However, with the coexistence of calcium ions and potassium permangate, the color of the algal suspension was turned yellowish-brown, compared to the light purple when only potassium permangate was added. The explanations for these phenomena were that positively charged calcium ions can promote the adsorption of MnO2, the reduction product of permangate onto algae cell surface, both were negatively charged under neutral pH value. And the color of MnO2 is yellow-brown.
Based on the observation by SEM, high ozone dosage was found to cause the disintegration of diatom cells and the rupture of mucilage layer of blue-green algae. Both would cause the increase in dissolved organic concentration and, therefore, the NPDOC value of the aqueous phase. Those organics would compete with algae cells for coagulants during the coagulation process, and have detrimental effect on algae coagulation removal.

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