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【单选题】
下列有关初次沉淀池运行管理的说法中错误的是（）。
A.
初次沉淀池SS去除率过高，将导致曝气丝状菌过度繁殖，引起污泥膨胀和污泥指数上升，此时应增大表面负荷（到50-100m 3 /m 2 ）以使形成活污泥的SS流入；
B.
在开闭初次沉淀池的入流闸门调节流量时，要一边观察一边进行，应避免大幅度操作，闸门的调节可在流量最大时一次性进行，此后，只要不妨碍使用一般不再调节；
C.
如果初次沉淀池的入流污水是均衡的，则的污泥堆积也是均匀的，因此不必进行排泥量的调节；
D.
每天应定期对初次沉淀池的出进行巡视，观察有无污泥上浮及气泡产生。
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