【摘要】 为了有效控制A/O生物除磷工艺处理化粪池污水时产生的丝状菌膨胀,先后采取改变系统的COD污泥负荷(NCOD)、溶解氧(DO)的质量浓度和降低S2-的质量浓度等措施,最终使A/O除磷工艺丝状菌膨胀得到了控制,污泥沉降性能得到了有效恢复.研究结果表明:A/O除磷工艺在高NCOD条件下运行时,容易发生严重的丝状菌膨胀现象,原因是COD在厌氧区降解后仍有较高的剩余量进入好氧区,导致聚磷菌在和丝状菌的竞争中优势变弱;在低NCOD条件下运行时,由于原水中硫化物含量过高导致丝状硫细菌增殖,因此仍然存在轻度的丝状菌膨胀现象.更多还原

【Abstract】 In order to effectively control the sludge filamentous bulking in A/O phosphorus removal process when treating wastewater of septic tank.By changing sludge loading、dissolved oxygen concentration,and reducing the concentration of S2-,sludge filamentous bulking was controlled effectively,and also the settling ability of activated sludge got recovered.The results showed that,when the sludge loading of A/O process is higher,serious sludge filamentous bulking easily happened,because the remaining COD was still very high when it got out of anaerobic tank,which led to disadvantaged PAO when it competed with filamentous bacteria.When A/O process ran at lower sludge loading,the problem of slight sludge filamentous bulking still existed,because the amount of sulfide in the wastewater was very high,which triggered the proliferation of filamentous sulfur bacteria.更多还原