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硝化液回流比对A~2/O-MBBR工艺反硝化除磷效果的影响
doi: 10.13205/j.hjgc.201508004
EFFECT OF NITRIFICATION LIQUID REFLUX RATIO ON DENITRIFICATING PHOSPHORUS REMOVAL IN AN A2 /O-MBBR PROCESS
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摘要: 采用强化生物除磷系统(A2/O-MBBR)联合工艺,研究硝化液回流比(100%、150%、200%、300%)对该系统反硝化除磷效果的影响。研究结果表明:在进水ρ(COD)为400 mg/L、ρ(NH+4-N)为30 mg/L、ρ(SOP)为8 mg/L条件下,硝化液回流比对A2/O-MBBR工艺系统中COD、NH+4-N和TN的去除率影响不大,而对缺氧区的吸磷量影响明显,缺氧区吸磷量随着硝化液回流比的增大呈现先上升后下降的趋势。当回流比为200%时,缺氧区的NO-3-N浓度为4mg/L左右,吸磷量最大为20.2 mg/L,胞内聚合物PHB代谢活性最好,利用率最高为1.12 g/(g·L)。体现了A2/OMBBR联合工艺具有显著的反硝化除磷效果。Abstract: With an enhanced biological phosphorus removal system ( A2 /O-MBBR) ， the paper studied the effect of different nitrification liquid reflux ratio on denitrifying phosphorus removal． The results showed that in the condition of COD of 400 mg /L， NH + 4 －N of 30 mg /L，SOP of 8 mg /L，nitrification liquid reflux ratio of A2 /O-MBBR process had a little effect on the removal rate of COD，NH + 4 －N and TN． The phosphorus absorption amount of anaerobic pool increased with increasing reflux ratio． When reflux ratio increased to 200%( NO － 3 －N = 4 mg /L) ，the amount was 20. 2 mg /L and the maximum utilization of PHB was 1. 12 g /( g·L) and had the best metabolic activity． The system of A2 /O-MBBR was proved to have significant denitrifying phosphorus removal capacity．
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