中文摘要：

采用人工废水,将2套接种了优势丝状菌不同的污泥、以A2/O方式运行的SBR反应器进水磷酸盐浓度由10 mg/L逐步提高到30 mg/L,研究了系统脱氮除磷过程中污泥含磷量与污泥沉降性能的变化,探讨了污泥含磷量、丝状菌与污泥膨胀的关系.结果表明,随着进水磷浓度从10 mg/L提高到20 mg/L和30 mg/L,1号反应器污泥含磷量从接种污泥的2.5%提高到8.17%和9.23%,污泥SVI值由接种初期的110 mL/g迅速增加到300 mL/g左右,之后回落并维持在135~150 mL/g.污泥中含磷量增加至8%以上,这在一定程度改善了污泥的沉淀性,对污泥膨胀起到抑制作用.2号反应器污泥含磷量从接种污泥的1.89%提高到6.77%和6.95%,污泥的SVI值由接种初期的138 mL/g上升到190-320 mL/g之间,并维持在280-300 mL/g.污泥中含磷量增加对于2号反应器膨胀污泥的沉淀性能没有改善.这2个反应器污泥沉淀性变化的差异是由于1号反应器污泥中的浮游球衣细菌在环境诱导下进行了生物除磷作用,使得污泥的比重增大,从而改善了污泥的沉降性能,而2号反应器中无浮游球衣菌,因而污泥沉降性没有改善.污泥含磷量增加能否抑制污泥膨胀的发生取决于在除磷过程中系统主导丝状菌的种类.

英文摘要：

In order to investigate the relationship among phosphorus content of sludge,filamentous bacteria and sludge settleability,two sets of Sequencing Batch Reactor（SBR） inoculated activated sludge that had different dominant filamentous bacteria and fed with synthetic wastewater were operated in A2/O process.Phosphorus concentration in influent was increased from 10mg/L to 30mg/L.Result showed that with increase of phosphorus in influent from 10mg/L to 20mg/L and 30mg/L,phosphorus content of the sludge in reactor No.1 was raised from 2.5% at early stage of inoculation to 8.17% and 9.23% correspondingly.SVI increased rapidly from 110 mL/g to 300mL/g around and were about 135-150mL/g subsequently.It is considered that improvement of settlement of sludge in the reactor No.1 was contributed to certain extent to the increase of phosphorus content in the sludge to 8% above.While in reactor No.2 phosphorus content in its sludge was only raised from 1.89% to 6.77% and 6.95% correspondingly with increase of phosphorus in influent from 10mg/L to 20mg/L and 30mg/L.SVI of the sludge increased from 138mL/g to 190-320mL/g,and finally kept at 280mL/g to 300mL/g.Settlement of sludge in the reactor No.2 wasn＇t improved by increase of the phosphorus content in sludge.The different performance of sludge in settlement between the two reactors is considered to due to existence of S.natans in the reactor No.1 that was stimulated to conduct biological phosphorus removal resulting in an increase of dense of the sludge.In contrast,it was not so in the reactor No.2.Whether or not sludge bulking can be controlled by increase of phosphorus content in activated sludge depends on the succession of predominant filamentous bacteria.