本研究以 MBR 處理高科技業之低碳比廢水，並探討外加碳源對污染 物去除之影響，在不同 C/N 比下研究各污染物之去除效率，結果與建議可 歸納為下列幾點：
5.1 結論
1. 在整個實驗中，不同之 C/N 下，SS、COD、BOD5及 NH4+-N 之去除 效率皆能良好且穩定地維持，因此以上污染物之去除不受廢水 C/N 之 影響。
2. TN 之去除效率隨 C/N 增加而上升，當 C/N=8.1 時，TN 去除效率可達 最大 98%。
3. 脫硝比率隨 C/N 比增加而上升，且在 C/N=9.4 時達到完全脫硝。但本 研究未考慮生物攝氮的部份，因此實際脫硝比率應比本研究之計算值 低。
4. 硝化速率隨 C/N 比增加而下降乃是因為污泥濃度隨 C/N 比增加而上升，
若以 qPCR 之硝化菌比例結果計算，高或低 C/N 比之硝化速率應差異 不大，如此便符合 NH4+-N 在整個實驗中良好的去除效率結果。
5. 硝化細菌在低 C/N 比時佔污泥總量的比例為在高 C/N 比時的 10 倍，
顯示較高的碳源對硝化細菌有負面的影響。而本研究中之 NOB 以 Nitrospira 為主要菌種，主要原因為廢水中之 NO2
--N 濃度非常低，始 Nitrospira 成為優勢菌種，而非 Nitrobacter。
5.2 建議
1. 在實驗的最後階段，疑似受到污泥異常的原因而導致脫硝作用變差，
建議可進一步分析脫硝菌的活性是否有變化，以及其他菌種在污泥中 的分布情況為何。
2. 本研究之 C/N 最高為 12，雖然硝化效率有減低的趨勢，但水中 NH4+ -N 之去除效率仍非常良好，建議可繼續研究更高之 C/-N 對系統之去除 效率有何影響。
3. 磷的去除效率於本研究中沒有進一步探討，一般 MBR 對磷的去除乃 以氯化鐵或鋁鹽等化學藥劑等化學方法處理，建議可朝同時脫氮除磷 的方向來研究，提昇生物處理的效能。
4. 本研究未比較不同 SRT 對 MBR 系統之影響，建議可以 SRT 作為一參 數進行比較。
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