中文摘要：

采用SBR反应器，研究了两种不同负荷条件下好氧颗粒污泥中TOC和NH4＋-N的代谢途径（直接用于细胞合成和维持生命活动）。以人工配水为处理对象，接种污泥取自西安市北石桥污水厂氧化沟的回流污泥，R1、R2的负荷分别为2.4、0.8 kgCOD/（m3·d）。结果表明，R1、R2中微生物的比增殖率分别为0.69和0.72 gVSS/gTOC，分别有62%和61%的TOC被微生物用于维持生命活动。R1、R2对NH4＋-N的去除率分别为90%和79%，其中在R1中30%的氨氮被用于合成细胞，33%通过硝化反硝化途径被去除，其余部分转化为硝态氮；在R2中用于合成和反硝化的氨氮比例则分别为8%和19%。由此推断，有机负荷对好氧颗粒污泥中TOC代谢途径的影响并不明显，但对NH4＋-N的代谢过程有着显著的影响

英文摘要：

The metabolic pathways （ cell synthesis and life maintenance） of TOC and ammonia nitrogen in aerobic granular sludge SBRs operated at two different organic loading rates were investigated using synthetic wastewater. The seeding sludge was recycle sludge from the oxidation ditch in Beishiqiao WWTP, Xi＇ an City, and the loading rates of R1 and R2 were 2.4 and 0.8 kgCOD/（ m3 ·d） respectively. The results show that the specific growth rates of microorganisms in R1 and R2 are 0.69 and 0.72 gVSS/gTOC respectively. 62% and 61% of TOC are used for maintenance of microorganisms in R1 and R2 respectively. The removal rates of mmonia nitrogen in R1 and R2 are 90% and 79% respectively. In R1, 30% of ammonia nitrogen is used for synthesizing cells, 33% of that is removed by nitrification and denitrification, and the rest is transformed into nitrate nitrogen. However, in R2, the ammonia nitrogen removed by cell synthesis and denitrification is 8% and 19% respectively. Therefore, it can be concluded that the organic loading rate slightly affects the TOC metabolism but significantly affects the ammonia nitrogen metabolism.