摘要：通过试验发现生物系统用排除剩余污泥方式除磷的能力有限，当进水TP≥5mg/L时要保证出水TP≤0.5mg/L是困难的。采用活性污泥外循环方式对释磷的污泥进行回流，通过提高SBR系统污泥浓度的方式来提高除磷能力的试验表明：当MLSS=5g/L、循环污泥量=1/8系统污泥总量时，在进水TP≤11mg/L、TN=45mg/L的情况下仍能保证出水总磷达到一级排放标准，而且该系统出水NH3-N≤3.6mg/L，对总氮去除率≥86%，同时获得了最佳的除磷和脱氮效果。
关键词：活性污泥 污泥外循环 SBR系统 除磷 脱氮
Biological Phosphorus Removal Capability in SBR System Using External Recycle of Activated Sludge
tract：It was found through test that there is limited capability for phosphorus remova l by means of excess sludge wastage in biological system,and it is difficult for effluent to achieve TP≤0.5mg/L in the case of influent of TP≥5mg/L. A test was made in which the phosphorus-released sludge was returned by means of external recycle of activated sludge and phosphorus removal capability was impr oved by increasing sludge concentration in SBR system.The results show that when MLSS is 5mg/L,and recycled sludge quantity is 1/8 of total sludge amount i n the system with TP≤11mg/L and TN=45mg/L in influent,total phosphoru s in effluent can certainly reach the grade 1 of integrated wastewater discharge standard with NH3-N≤3.6mg/L and TN removal rate≥86% in effluent,and th us obtaining the optimal result in simultaneous removal of phosphorus and nitrog en.
Keywords:activated sludge;external recycle of sludge;SBR system;phosphorus removal; nitrogen removal
笔者拟采用间歇进出水、间歇的SBR工艺，利用活性污泥外循环技术，通过提高污泥浓度的方式来提高系统的除磷能力，最终实现生物除磷脱氮效果最佳的目的。