近年來國內水體的水質條件日趨惡化，大量流入的養分使水庫水質呈現優氧化的狀態，造成原水中的藻類大量生長，對後續的淨水處理流程構成困擾。在藻類問題的處理上，以氯為前氧化劑搭配後續傳統處理流程的方式可有效的增進藻類的去除率，但前氯在使用上有形成消毒副產物的問題，因此，尋找一個安全且有效的前氧化劑來替代氯是相當重要的。
　　本研究中，我們採用臭氧和高錳酸鉀為前氧化劑，配合純種的綠藻 (頂棘藻Chodatella sp.)和藍綠藻 (顫藻Oscillatoria sp.)進行研究，藉不同藻種受氧化劑影響的差異來探討氧化劑的使用條件、效果，並進一步的推測氧化劑可能的作用機制。
　　研究的結果顯示，對綠藻而言，高錳酸鉀和臭氧皆可有效的提升去除效率，且此效果和氧化劑劑量成正比。藍綠藻的去除率因受其自身凝聚效用的影響，在使用高錳酸鉀時需達到一最低劑量才可有效的增進去除率，臭氧則因其氧化力過強，故可能不適用於較脆弱的藍綠藻。此外，不論是採用高錳酸鉀或臭氧為前氧化劑，過高的氧化劑量皆有造成藻體破裂的疑慮，因此前氧化劑在使用上須有一最高劑量的限制，且此劑量會隨著處理藻種的不同及藻體濃度而變動。
　　在氧化劑作用機制的研究上，臭氧可能的作用機制為，藉由其本身氧化力改變藻體的表面性質使其易於被沉降去除；高錳酸鉀可能的作用機制，除以本身的氧化力改變藻體表面性質外，還有幫助藻體凝聚的效用，其中，高錳酸鉀的還原產物二氧化錳亦有幫助凝聚的效果。

關鍵字：藻類、前氧化劑、臭氧、高錳酸鉀

　Recently, the water quality of source water for public water supply in Taiwan is deteriorating. The huge inflow of nutrients make the reservoir water becomes eutrophic, which also leads to an increase in algae concentration in the water. A large number of algae in the source water will give a burden to the water treatment process. On the purpose of solving algae problem, prechlorination is a useful method. However, prechlorination may increase the formation of disinfection by-products (DBPs). Consequently, finding a safe and useful preoxidant to replace prechlorination is very important.
　In this studying, ozone and potassium permanganate were tested as alternative preoxidant. Two pure-cultured algae species, namely Chodatella sp. (green algae) and Oscillatoria sp. (blue-green algae), were selected. The effect of oxidants on algae cells and it’s variation between algae species were studied. Further, the mechanism of preoxidants oxidation on algae was also proposed.
　The results show that for green algae, both ozone and potassium permanganate preoxidantion could effectively increase algae removal, and the removal rate increased with increasing dosage. For blue-green algae, there existed a minimum dosage for potassium permanganate. Only when dosage exceeded this value, did it show the effect of improving algae removal. This probably is due to the self-agglomeration of the blue-green algae. Ozone, due to it’s strong oxidation power, is not suitable for the fragile blue-green algae. Furthermore, for both ozone and permanganate, excessive dosage may cause the rupture of algae cell. Therefore, there existed the highest allowable dosage in preoxidantion, and this value would vary with algae species and cell concentration.
　As far as the mechanism of ozone and permanganate preoxidation is concerned, ozone probably is using it’s oxidation power to change the surface properties of the cells, and then promoting their setting. Which for permanganate, in addition to changing cell surface properties of the cells through oxidation, permanganate could produce MnO2, the reducing product of permanganate, to promote cell agglomeration.

Key word：algae、preoxidant、ozone、potassium permanganate

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