Impact of different running conditions on performance of biofilters treating secondary effluent during start-up.
Impact of different running conditions on performance of biofilters treating secondary effluent during start-up.
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DOI：
10.1016/j.biortech.2019.02.094
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发表时间：
2019-06
影响因子：
11.4
通讯作者：
Shiyang Zhang;Changbo Zhu;S. Xia;Meng Li
中科院分区：
文献类型：
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作者：
Shiyang Zhang;Changbo Zhu;S. Xia;Meng Li
研究了不同曝气顺序、水力停留时间、曝气时间比和外加碳源对生物滤池启动过程中处理二级出水性能的影响。对于间歇曝气硝化滤池，调整曝气顺序，优先进行硝化或反硝化，对滤池的整体性能没有显著影响。延长HRT可促进沉淀和反硝化作用。然而，由于反硝化不完全，延长水力停留时间以提高性能是不可取的。同样，不同曝气时间比对性能的影响没有启动时间那么明显。向反硝化滤池投加外加碳源可以提高反硝化效果，其中葡萄糖更有利于反硝化，乙酸钠更有利于固磷。综合超标二级出水经硝化反硝化滤池依次投加葡萄糖后，各项监测指标均可达到A标准(GB 18918-2002，中国)。
In this study, the impact of different aeration sequences, hydraulic retention time (HRT), aeration time ratios and external carbon types on performance of biofilters treating secondary effluent during start-up was explored. For an intermittently aerated nitrifying filter, the adjustment of aeration sequence with prior nitrification or denitrification had no significant impact on overall performance. Extending HRT promoted sedimentation and denitrification. However, extending HRT to enhance performance is inadvisable due to incompleted denitrification. Similarly, the impact of different aeration time ratios on performance was not as apparent as that of start-up time. External carbon addition to denitrifying filter could enhance performance with glucose more favorable for denitrification and sodium acetate better for P sequestration. When the synthetic over-standard secondary effluent treated by the nitrifying and denitrifying filters in order with the latter added with glucose, all the monitored indices could reach the A standard (GB 18918-2002, China).