5ECHEVERRIA E,SECO A,FERRER J.Study the factors affecting activated sludge settling in doMestic wastewater treatMent plants[J].Wat.Sci.tech.1992,25(4-5):273～279.
6HERMANOWICZ S.W.DynaMic changes in populations of the activated sludge coMMunity:effects of dissolved oxygen variations[J].Wat.Sci.Tech.1987:889～895.
7CHUDOB J,DOHANYOS M,GRAU P.Control of activated sludge filaMentous bulking-Ⅳ.effect of sludge regeneration[J].Wat.Sci.Tech.1982,14(3):73～93.
8EIKELBOOM D.H,ANDREAS A,KJAER A.Survey of filaMentous population in nutrient reMoval plants in four european countries[J].Wat.Sci.Tech.1998,37(4-5):281～289.
