强化低碳源污水生物除磷的技术方式探究

以一营养物去除工艺——BNR为研究对象,分别采用试验与模拟,研究了通过厌氧上清液侧流磷回收和外加碳源方式对低碳源污水生物除磷的强化作用。试验结果与模拟预测双双显示,对COD/P值=50的实际生活污水实施30%的厌氧上清液旁路磷沉淀可明显强化生物除磷作用,使出水TP浓度从碳源抑制时的1.8 mgP/L下降至0.5 mgP/L以下。侧流磷回收不仅可回收40%的进水磷负荷,亦可节省27%的外加碳源。因此,厌氧上清液侧流磷回收与外加碳源对强化生物除磷作用有着异曲同工之处。模拟预测与试验结果几乎一致的演示表明,数学模拟技术可取代传统试验进行相关问题研究。

Study on Technical Methods for Enhancing Biological Phosphorus Removal from Wastewater with Low Carbon Source

Based on a BNR process,enhancing biological phosphorus removal from wastewater with low carbon source by side-stream phosphorus recovery from anaerobic supernatant and addition of external carbon source was evaluated by both experiment and modeling.Both experiment and modeling demonstrate that side-stream phosphorus recovery from 30% anaerobic supernatant can effectively improve biological phosphorus removal from wastewater with the COD/P ratio of 50,which makes the effluent phosphorus lowered to≤0.5 mgP/L from 1.8 mgP/L(limited by less carbon).Side-stream phosphorus recovery can not only recover 40% of the influent phosphorus loading,but also save 27% of external carbon source.Therefore,side-stream phosphorus recovery has the same function on enhancing biological phosphorus removal as addition of external carbon source.The simulation prediction matches the experimental results,which confirms that modeling is completely possible to replace conventional experiments for research purpose.