Nitrogen removal and biofilm structure affected by COD/NH4+–N in a biofilter with porous sludge-ceramsite
Nitrogen removal and biofilm structure affected by COD/NH4+–N in a biofilter with porous sludge-ceramsite
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DOI：
10.1016/j.seppur.2012.03.019
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发表时间：
2012-06
影响因子：
8.6
通讯作者：
J. Zou;Guo-ren Xu;K. Pan;W. Zhou;Dai Ying;Xue Wang;Dingbin Zhang;Yu-Chen Hu;Ming Ma
中科院分区：
文献类型：
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作者：
J. Zou;Guo-ren Xu;K. Pan;W. Zhou;Dai Ying;Xue Wang;Dingbin Zhang;Yu-Chen Hu;Ming Ma
以自制污泥陶粒为生物滤池载体，研究其生物刺激特性以获得高生物量浓度，并以广州陶粒、江西陶粒和山西活性炭的性能作为基准进行比较。结果表明，四个生物过滤器中 COD 和总氮 (TN) 的去除效率随着 COD/NH4+-N 比率（4、5.7、8 和 10）的增加而增加。平均而言，污泥-陶粒生物过滤器将 79.1–86.4% 的 NH4+−N 转化为 NOx−−N，并在 COD/NH4+–N 比率为 4–10 时去除 43.9–51.0% 的 TN，略优于其他生物过滤器。污泥陶粒发达的多孔结构（0.5μm<孔径<10.0μm）有利于大量微生物群落的发育，提高生物膜层的渗透能力和污染物去除效率，因为它们决定了污染物在水相、液固边界和生物膜内部发生的传质和生物接触反应。结论是，这些结果可以作为利用这种多孔轻质（堆积密度为668.2kgm−3，颗粒密度为1251.2kgm−3）污泥陶粒作为生物废水处理载体的基本认识。
Self-made sludge-ceramsite was tested as carrier in biofilter to investigate its biogenic stimulating properties for obtaining high biomass concentration, and the performance of Guangzhou ceramsite, Jiangxi ceramsite, and Shanxi activated carbon were provided as a baseline for comparison. Results show that the removal efficiencies of COD and total nitrogen (TN) increase along with the increased COD/NH4+–N ratio (4, 5.7, 8, and 10) in the four biofilters. On average, the sludge-ceramsite biofilter converts 79.1–86.4% of NH4+−N to NOx−−N and removes 43.9–51.0% of TN at COD/NH4+–N ratios of 4–10, which are slightly better than the other biofilters. The well-developed porous structures (0.5μm<pore size<10.0μm) of sludge-ceramsite is propitious to develop many microbial communities and to improve the permeable capacity of biofilm layers and the pollutants removal efficiencies, as they determine the pollutants mass transfer and the biological contact-reaction that occur in the aqueous phases, liquid–solid boundary, and biofilm interior. It is concluded that these results can be considered as basic understanding for utilization of this porous and lightweight (bulk density of 668.2kgm−3and particle density of 1251.2kgm−3) sludge-ceramsite as carrier in biological wastewater treatment.