Lee Jae-Kune, Choi Chang-Kyoo, Lee Kwang-Ho, Yim Soo-Bin
Daejeon Development Institute, Seogu, Daejeon, Republic of Korea.
Bioresour Technol. 2008 Nov;99(16):7788-96. doi: 10.1016/j.biortech.2008.01.057. Epub 2008 Mar 5.
This study investigated characteristics of a sequencing batch reactor (SBR) system which was varied with respect to sludge retention time (SRT) (5.9, 8.2, 10.5, 12.2, and 16.2 days). The removal efficiencies of chemical oxygen demand (COD) were more than 90% under all SRT conditions, and the greatest efficiency (92.2%) occurred with a SRT of 16.2 days. As the SRT increased, the denitrification rate per mixed liquor suspended solids (MLSS) during the anoxic(I) period decreased significantly from 166.3 mg NO(X)(-)-N/g MLSS d to 68.8 mg NO(X)(-)-N/g MLSS d. As the SRT increased, the phosphorus removal efficiency decreased from 47.1% (SRT of 5.9 days) to 31.0% for a SRT of 16.2 days, because active phosphate release and uptake occurred under shorter SRT conditions. The mass balance of nitrogen (with respect to nitrogen in the influent) at a SRT of 16.2 days (the highest nitrogen removal efficiency) showed 14.9% of nitrogen was removed in clarified water effluent, 49.7% was removed by the sludge waste process and 33.3% was removed by denitrification. Nitrogen processing was well accounted for in the SBR system as the nitrogen mass balance was close to 100% (97.9%).
本研究调查了序批式反应器（SBR）系统的特性，该系统的污泥停留时间（SRT）有所不同（5.9、8.2、10.5、12.2和16.2天）。在所有SRT条件下，化学需氧量（COD）的去除效率均超过90%，其中SRT为16.2天时效率最高（92.2%）。随着SRT的增加，缺氧（I）期混合液悬浮固体（MLSS）的反硝化速率从166.3 mg NO(X)(-)-N/g MLSS d显著降至68.8 mg NO(X)(-)-N/g MLSS d。随着SRT的增加，除磷效率从SRT为5.9天时的47.1%降至SRT为16.2天时的31.0%，这是因为在较短的SRT条件下会发生活性磷酸盐的释放和吸收。在SRT为16.2天（脱氮效率最高）时，氮的质量平衡（相对于进水氮）显示，14.9%的氮在澄清水流出物中被去除，49.7%通过污泥排放过程被去除，33.3%通过反硝化作用被去除。由于氮质量平衡接近100%（97.9%），SBR系统中氮的处理情况得到了很好的说明。
