A2O-BAF反硝化除磷工艺丝状菌膨胀的发生及控制

为了有效控制A2O-BAF反硝化除磷工艺处理实际生活污水时产生的丝状菌污泥膨胀,研究了有机负荷和冬季突然降温对丝状菌污泥膨胀的影响.结果表明:当有机负荷低于0.30kgCOD/(kgMLSS·d)时,系统中存在轻度的丝状菌污泥膨胀现象;当有机负荷高于0.55kgCOD/(kgMLSS·d)时,容易引发严重的丝状菌污泥膨胀,调节有机负荷可使丝状菌污泥膨胀得到有效控制.冬季突然降温也会导致污泥膨胀的发生,恢复温度后,污泥沉降性能恢复正常,丝状菌污泥膨胀亦得到有效控制.

Occurrence and control of filamentous bulking in A2O-BAF denitrifying phosphorus removal process

In order to effectively control the sludge filamentous bulking in A2O-BAF denitrifying phosphorus removal process when treating domestic wastewater, the effects of sludge load and temperature on sludge filamentous bulking were investigated. The results had shown that the problem of slight sludge filamentous bulking existed when the sludge load was less than 0.30kgCOD/(kgMLSS·d). Serious sludge filamentous bulking got easily happened when the sludge load was higher than 0.55kgCOD/(kgMLSS·d), and sludge filamentous bulking was controlled effectively by changing sludge load. The sludge filamentous bulking also occurred when the temperature was decreased in winter, but the settling ability of activated sludge got recovered after increasing the temperature to original level, and the sludge filamentous bulking was also controlled effectively.