結合硝化／脫硝（單一污泥）系統處理豬糞尿廢水佳化模式

以蔗糖為有機物配製之高含氮合成廢水（模擬豬糞尿廢水經固液分離機及約三天水力停留時間厭氣處理後之出流水；COD=2730～3030 mg/L，TKN=870～900 mg/L）經單一污泥型系統（厭氧槽：無氧槽：好氧槽=12 L：17 L：50 L）處理，在進流量12～24L/d、污泥迴流比1～2、混合液迴流比1～2及污泥齡13～19天之條件下操作，發現COD、TKN、TN及TP去除率分別為93%～99%、84%～99%、66%～73%及12%～24%。實驗結果亦發現，高含氮廢水中有機物不足，使得單一污泥型系統中無氧槽之脫硝速率（內呼吸型脫硝）遠小於厭氧槽者；增加污泥迴流比，雖會增加單一污泥型系統之TN去除率，但卻降低系統之TP去除率；高含氮廢水經單一污泥型系統硝化及脫硝處理後，其鹼度消耗量與理論值之比值介於0.90～0.94之間；若只有無氧槽中殘存NO_X^--N時，則改變混合液迴流比對單一污泥型系統之TKN及TN去除率無影響。再者，單一污泥型系統各反應槽污泥相對於強化培養污泥之活性分別為：厭氧槽脫硝活性為0.54、無氧槽脫硝活性為0.036及好氧槽硝化活性為0.21；硝化反應為Monod型動力，其K_n=1.15d^(-1)，K_(sn)=17.3 mg N/L；脫硝反應為零階動力，其k_d=1.03 d^(-1)。最後，以獨立試驗求得之參數值代入本研究所推導之單一污泥型硝化╱脫硝模式模擬，計算結果與系統之實驗結果大致符合。

關鍵字

單一污泥型系統；模擬豬糞尿廢水；硝化／脫硝動力；動力模式；模式驗證

並列摘要

When the high concentrated sucrose and nitrogen wastewater (COD=2730~3030 mg/L, TKN=870~900 mg/L) was treated by the single-sludge reactor system (V_(anaerobic) : V_(anoxic) : V_(aerobic) = 12L : 17L : 50L) under the inflow rates of 12-24 L/d, sludge recycle ratios of 1-2, mixed liquor recycle ratios of 1-2, and MCRT of 13-19 d, the removal efficiencies of COD, TKN, TN, and TP were 93%-99%, 84%-99%, 66%-73%, and 12%-24%, respectively. The experimental results also disclosed that, with an increase in sludge recycle ratio, the removal efficiency of TN in the single-sludge reactor system increased but the removal efficiency of TP decreased. After nitrification and denitrification of the high concentrated nitrogen wastewater in the single-sludge reactor system, alkalinity of the treated wastewater decreased and that the ratio of the actual consumption of alkalinity to the theoretical was 0.90-0.94. When the concentration of NO_x^--N was detected in the anoxic compartment, the change of mixed liquor recycle ratio did not affect the removal of TKN and TN in the single-sludge reactor system. Moreover, the activity of denitrifiers (nitrifiers) in the anaerobic, anoxic, and aerobic compartments relative to those in the batch reactors containing enrichment culture were 0.54, 0.036, and 0.21, respectively. Also, nitrification followed the Monod-type kinetics with the rate constants k_n and K_(sn) of 1.15 d^(-1) and 17.3 mg N/L, respectively. Denitrification followed the zero-order kinetics with the rate constant k_d of 1.03 d^(-1). Finally, by inserting biological parameter values (obtained by independent experiments) into the proposed nitrification-denitrification model of the single-sludge reactor system, the calculated TKN and TN removal efficiencies were in fairly good agreement with the experimental.

並列關鍵字

Single-sludge reactor system ； Simulated piggery wastewater ； Nitrification/denitrification kinetics ； Kinetic model ； Model verification

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