以转炉石为人工湿地填充材之功能评价.DOC

以轉爐石為人工濕地填充材之功能評估 The perfomance of artifical wetland using BOF slag as filter 研究生：簡富成 Jian, Fu-Cheng 指導教授：葉桂君 Yeh, Kuei-Jyum 【摘要】 本研究是以轉爐石做為人工濕地的填充材。實驗以6個槽體(Cell 1~6)構成3個系統(Line 1~3)，每天進流一定量經曝氣及植生處理之生活污水，定期採樣分析探討反應槽對正磷酸鹽、總磷、SS、COD及BOD的去除率以及pH值的調降。結果顯示每個系統對正磷酸鹽及總磷的去除率皆達95%以上，對COD的去除率則有80-85%，對BOD的去除率亦有80%以上，對SS的去除率亦高達90%以上。進流水的pH值為中性，但通過轉爐石後皆普遍升高，故於出口槽填入木炭調整pH值，但木炭成效未達預期，故把木炭移除並改建成土壤濾床式人工濕地，結果發現pH值可下降約1個單位。同時在實驗室亦建立了小型爐石反應槽以探討連續流與脈衝流的差異並同步比對現場爐石反應槽的實驗結果。結果發現連續流以及脈衝流在調降pH值的能力以及對正磷酸鹽的去除率並沒有太大的差異，而pH值下降的趨勢與現場爐石反應槽呈現的趨勢相近。實驗室人工溼地結合爐石反應槽實驗結果發現S+CW (轉爐石+小型人工溼地)系統的ΔpH為2.0~3.8，而CW/S+S (小型人工溼地/轉爐石+轉爐石)系統的ΔpH為1.0~2.0，故S+CW系統調降pH值的能力比CW/S+S系統優越，且pH reducer (pH調降裝置)可以更有效地調降pH值，但需定期更換填充材料，避免達吸附飽和後而失效。放流水中重金屬分析也證明了轉爐石雖然會釋放出Cr，但僅釋出微量(0.029±0.007 mg/L)，故不必擔心會引發二次污染的問題。 關鍵字：轉爐石、人工濕地、磷之去除、pH值 【Abstract】 In this study, laboratory and pilot reactors were operated to test the SS, COD and phosphorus removals by the blast oxygen furnace (BOF) slag as a packing material in the constructed wetland. The results show that the removals of ortho and total phosphates are more than 95%. Its can also remove 80~85% of COD, more than 80% of BOD and more than 90% of SS. When water flows through BOF slag, the effluent pH increases to more than 13. Thus, operation modes were tested to solve the pH increase in the effluent of slag reactor. The pH decrease to below 8.5 after passing more than 70 pore volumes (PVs) of water. The laboratory-scaled slag reactor followed by a constructed wetland of plants and acid soils can further reduce the effluent pH by 1~2 units. The results from the laboratory BOF slag reactor reveal that there are no differences between the continuous-flow and the pulsed-flow operations in pH decreasing pattern and orthophosphate removal. In addition, the pH decrease pattern is also similar to the pilot BOF slag reactor on site. The BOF slag releases trace Cr ion only in the range of 0.029±0.007 mg/L. The overall results show that BOF slag is a suitable material to be used