摘要
本文采用4种碳源(乙酸钠、丙酸、葡萄糖、纤维素)在间歇式(SBR)小型反应装置中对采自太湖沉积物中的微生物进行培养富集试验,研究碳源对太湖沉积物中聚磷菌的影响以及聚磷菌在太湖沉积物磷循环中的作用,结果表明:当SBR反应装置的进水COD/P为20、进水采用人工配水、运行周期(包括进水、厌氧阶段、好氧阶段、沉降静置和出水)为24h、水力停留时间为48h、固体停留时间约为20d、好氧阶段溶解氧约为2～3mg/L、气速为1L/min、进水pH值控制在7.5±0.05、温度控制在25±1℃时,SBR反应装置厌氧阶段磷酸盐含量有不同程度的升高,好氧阶段出水磷酸盐含量降低,呈现出聚磷菌厌氧释磷、好氧聚磷的典型特征,证明太湖沉积物中存在聚磷菌;当用丙酸作碳源,厌氧释磷、好氧聚磷最为显著,表明乙酸钠和丙酸有利于聚磷菌的富集。
For the purpose of investigating the effect of different carbon resources on the enrichment of polyphosphate accumulating organisms（PAO） from sediment samples as well as the effect of PAO on the cycle of phosphorus in lake sediments,sedimentary samples in Taihu Lake were taken and enriched through using four kinds of carbon sources（glucose,cellulose,sodium acetate and propionate） in laboratory-scale sequencing batch reactors（SBRs）.The COD/P ratio in the feeding was 15∶1.The cycle time was 24 h,consisting of feeding,anaerobic period,aerobic period settle/decant period.The hydraulic retention time was 48 h,and the solids retention time was controlled for approximately 20 days.The dissolved oxygen concentration in aerobic period was maintained at 2~3 mg/L using an pump where air was supplied at a flow rate of about 1 L/min.The reactor was operated at 25℃ with an initial pH of 7.5±0.1.The results showed that the orthophosphate concentration increased at the anaerobic phase in four reactors more or less,and decreased at the aerobic phase,which confirmed that there existed polyphosphate accumulating organisms in sediments of Taihu Lake.While phosphorus release rate using propionate as single carbon resource was the highest,acetate and propionate as substrate were benefit for the accumulation of PAO.
出处
《安全与环境工程》
CAS
2011年第6期49-52,共4页
Safety and Environmental Engineering
基金
国家"973"计划重大基础项目(2008CB418005)
金肯学院技术项目(JK2009001)
关键词
聚磷菌(PAO)
SBR
碳源
太湖沉积物
polyphosphate accumulating organisms（PAO）
SBR
carbon resource
sediments in Taihu Lake
