溶解氧及碳氮比对SBR处理猪场厌氧消化液脱碳除氮效能的影响

Effect of DO and C/N Ratio on COD_(cr) and Ammonia Nitrogen Removal from Swine Wastewater Using Sequencing Batch Reactor(SBR)

猪场厌氧消化液因C/N低,常规的生物脱氮工艺存在COD去除效率低、脱氮效果差等问题。文章以模拟猪场厌氧消化液为处理对象,考察了不同溶解氧浓度(DO浓度均值为2.0和4.0 mg/L)及进水C/N(C/N=2.7、4和6)对SBR工艺脱碳除氮效能的影响。结果表明:CODcr去除率随C/N的增加而升高,并且提高C/N有利于氨氮和总氮的去除,它们的去除率随进水C/N值的增加均呈上升趋势,在C/N=6时分别达到86%和94%。

Conventional biological nitrogen removal processes have low COD removal efficiency and poor denitrification effect for swine wastewater of low C/N ratios. The impacts of dissolved oxygen level and C/N ratios on CODer and nitrogen removal efficiencies in a sequential batch reactor were studied by setting dissolved oxygen levels at 2.0,4. 0 mg/L and different C/N ratios （2.7,4 and 6）. The results showed CODer removal efficiency increased as C/N increased. Improving the C/N was beneficial to the removal of ammonia nitrogen and total nitrogen. The removal rate of NH4^＋ - N and TN rose quickly as C/N ratios increased, the optimal removal rate of NH4^＋ - N and TN were 86% and 94%.