The biological treatment of Zhuyuan No.2 WWTP is a new closed two-sludge treatment process.Activated Sludge Model No.l was used as a base for modelling of the activated sludge system.The component concentrations in wastewater、the heterotrophic yield coefficient（YH） and heterotrophic decay coefficient（bH） parameters of the activated sludge system had been measured in Zhuyuan NO.2 WWTP and these data provide the essential data for model establishment and model correction.The results showed that： the ratios of readily biodegradable substrate（Ss）,slowly biodegradable substrate（Xs）,soluble inert substrate（SI）,heterotrophic biomass（XBH） and particulate inert substrate（XI） to total COD are 20.0%,32.1%,17.4%,9.6% and 20.9%,respectively.The ratios of ammonium（SNH）,soluble biodegradable organic nitrogen（SND）、particulate biodegradable organic nitrogen（XND） to TN are 71.5%,10.0% and 18.5%,respectively.The heterotrophic yield coefficient（YH） of the traditional activated sludge process branch and the A/O process branch of the closed two-sludge treatment process are 0.68 and 0.78,respectively;heterotrophic decay coefficient（bH） is 0.501 d-1and 0.621 d-1,respectively.%竹园第二污水厂采用一种闭式双泥龄新型工艺。以活性污泥1号模型（ASM1）为基础,测定污水厂的进水水质特性参数、异养菌产率系数（YH）和异养菌衰减系数（bH）,为后续工艺模型的建立和校正提供基础数据。结果表明：竹园第二污水厂进水易生物降解有机物（Ss）、慢速生物降解有机物（Xs）、溶解态惰性有机物（SI）、异养菌（XBH）、颗粒态惰性有机物（XI）占总COD的平均比值分别为20.0%、32.1%、17.4%、9.6%、20.9%。进水氨氮（SNH）、溶解态可生物降解有机氮（SND）、颗粒态可生物降解有机氮（XND）占TN的平均比值分别为71.5%、10.0%、18.5%。闭式双泥龄工艺平行组合中的传统活性污泥池和A/O池分支的异养菌产率系数（YH）分别为0.68和0.78,异养菌衰减系数（bH）分别为0.501 d-1和0.621 d-1。
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