硝化液回流比对A^2/O-MBBR工艺反硝化除磷效果的影响

EFFECT OF NITRIFICATION LIQUID REFLUX RATIO ON DENITRIFICATING PHOSPHORUS REMOVAL IN AN A^2/ O-MBBR PROCESS

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。

With an enhanced biological phosphorus removal system（ A^2/ 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,NH4^＋-N of 30 mg / L,SOP of 8 mg / L,nitrification liquid reflux ratio of A^2/ O-MBBR process had a little effect on the removal rate of COD,NH4^＋- N and TN. The phosphorus absorption amount of anaerobic pool increased with increasing reflux ratio.When reflux ratio increased to 200%（ NO3^--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 A^2/ O-MBBR was proved to have significant denitrifying phosphorus removal capacity.