- 期刊
無氧／好氧處理程序去除養豬廢水中COD及氮之研究
Anoxic/Aerobic Process for the Treatment of Swine Wastewater for COD and Nitrogen Removal
摘要
本研究的目的在於評估改善目前三段式養豬廢水處理程序，以期併同去除有機碳及氮，而建立（1）懸浮生長方式之無氧／好氧系統，（2）生物膜生長方式之無氧／好氧系統，（3）單一污泥之無氧／好氧系統，比較三個系統對於COD及氮去除效率及反應槽水質變化情形，並分別測定硝化菌及脫硝菌之活性。研究結果顯示，對於氮的去除，以懸浮式系統較佳，COD去除率則與硝化及脫硝效率有關，若硝化及脫硝效率高，則放流水COD濃度可達300 mg/L 以下。在TKN負荷0.236 g-N/L．day時，COD去除率可達97.8％，TKN轉化率為98.8％，T-N去除率82.5％。至於曝氣槽污泥之硝化活性方面，懸浮式系統好氧槽之TKN負荷為0.418 g-N/L．day時，SOUR為25.01 mg-O_2/g-SS．hr，單一污泥之無氧／好氧系統為23.84 mg-O_2/g-SS．hr，而生物膜系統則較低，為21.84 mg-O_2/g-SS．hr。無氧槽之脫硝效率在HRT為3天及2天時，懸浮式及生物膜系統均可達100％，脫硝菌活性亦以懸浮式系統最高，在HRT為3天的試程中，為0.146 mg-N/g-S.S. min。
並列摘要
In order to remove COD and nitrogen from swine wastewater, we established: (1) the anoxic /aerobic system with suspended growth, (2) the anoxic/aerobic system with biofilm growth, (3) the anoxic/aerobic system with single sludge recycle. Among these three systems, we compared the removal efficiency of nitrogen and COD, and the changing of water quality in reactors. We also tested the activity of sludge for the nitrifying bacteria and denitrifying bacteria. The result showed that the suspension system is better for removal of nitrogen. When TKN loading was 0.236 g-N/I day, the removal efficiency of COD could reach 97.8%, the TKN conversion efficiency was 98.8%. The COD removal efficiency of the three systems were correlated to nitrification and denitrification of the systems. When the nitrification efficiency was over 50% and the denitrification efficiency reached 100%, the COD concentration in the effluent could be reduced to a level below 300 mg/L.