本研究利用流動式接觸床處理技術(moving bed bio-film reactor, MBBR)以PE聚乙烯及PU聚氨酯之生物擔體對於不同氨氮濃度去除效率之影響並探討氨氮濃度、溶液pH、以及充填率對於不同型態生物擔體之影響，再以光電實廠MBR(薄膜過濾系統)出水進行測試。 PE聚乙烯生物擔體表面積為500 m2/m3、PU聚氨酯表面積為2000 m2/m3，研究得知，PE聚乙烯生物擔體雖表面積小於PU聚氨酯生物擔體但是因為污染物可以有效的通過PE聚乙烯生物擔體讓微生物可以進行反應。PU聚氨酯生物擔體經過生物馴養後，會造成污泥包覆情形，微生物無法有效通過進行反應 ，而造成處理效率不佳。 以PE聚乙烯測試後，在pH部分，在pH6~9時消耗的鹼度較為明顯，而最終反應的pH在6~9時(最適合為生物生長條件)，去除效率也較佳(約可以達到69~90 %)。在充填率部份，經實際測試結果得知以PE聚乙烯生物擔體進行測試氨氮濃度為20 mg/L時，最佳充填率約30 %，水力停留時間(HRT)經過5小時，去除效率約可達到約90 %以上。對於實廠應用上，評估充填率成本時可列入建議。在整體的氨氮去除率顯示，水力停留時間延長，對於氨氮去除率皆有提升。氨氮與硝酸鹽氮的比例呈現反比，並非因為微生物生長吸附作用而去除，確實因為硝化菌的硝化作用達到去除的成效。 This study utilizes the technology of moving bed bio-film reactor (MBBR) to explore the influences of the biological carriers, they are, polyethylene (PE) and polyurethane (PU), on the removal efficiency of ammonia. The effects of concentration of ammonia, pH of solutions, and packing ratio of the carriers on the removal efficiency were also investigated. Finally, the effluent of the membrane bio-reactor (MBR) in a real optoelectronics factory is used to confirm the results from modeled system. The surface area of PE biological carrier was 500m2/m3 and that of PU was 2000m2/m3. From the study, although the surface area of PE carriers was smaller than that of the PU carriers, the contaminants could effectively decomposed by the microorganism on PE while sludge were filled within PU and prohibited the contaminants from diffusing/penetrating of contaminants into the carrier and from being decomposed by the sludge inside the carrier. As the consequence, when PU carrier is used, the removal efficiency is less than when PE was used When pH was 6－9, the biological growth was favored therefore, the removal efficiency was the best (up to 69-90%) and the alkalinity consumption was relatively obvious. When the concentration of ammonia was 20 mg/L, the removal efficiency could be higher than 90% with 30% packing of PE carriers and hydraulic retention time (HRT) of 5 hr. The overall ammonia removal rate indicates that prolonging of HRT can promote the removal rate of that. Moreover, as the ratio of ammonia is inversely proportional to the nitrate nitrogen, it is confirmed that the removal of ammonia is not caused by the absorption of growing microbion but by the nitrification of nitrobacters.
