Effect of sludge-fly ash ceramic particles (SFCP) on synthetic wastewater treatment in an A/O combined biological aerated filter.
Effect of sludge-fly ash ceramic particles (SFCP) on synthetic wastewater treatment in an A/O combined biological aerated filter.
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DOI：
10.1016/j.biortech.2008.08.035
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发表时间：
2009-02
影响因子：
11.4
通讯作者：
Shu-xin Han;Q. Yue;M. Yue;B. Gao;Yaqin Zhao;Wenjing Cheng
中科院分区：
文献类型：
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作者：
Shu-xin Han;Q. Yue;M. Yue;B. Gao;Yaqin Zhao;Wenjing Cheng
研究了新型填料-污泥-粉煤灰陶粒（SFCP）在升流式A/O曝气生物滤池中处理模拟废水的效果。探讨了水力停留时间（HRT）、气液比（A/L）和回流对COD_（cr）、氨氮（NH 4 +-N）和总氮（TN）去除率的影响。最佳运行条件为水力停留时间2.0h，A/L为15：1，回流比200%。在最佳工艺条件下，CODcr去除率达90%，NH3-N去除率达98%以上，TN去除率达70%左右。在200%回流条件下，CODcr、NH 4 +-N和TN的平均消耗容积负荷分别为4.06、0.36和0.29kg（m3 d）−1。由于曝气生物滤池（BAF）的合理布置，CODcr和TN的去除主要发生在缺氧区，而硝化作用主要发生在距离底部入口70 cm处。污水特性和反冲洗对TN去除有很大影响。此外，填料（SFCP）和模拟废水的特性使BAF系统具有较强的缓冲能力，不同填料高度出水pH值波动较小，对回流不敏感。
Novel media–sludge-fly ash ceramic particles (SFCP) employed in an upflow lab-scale A/O BAF were investigated for synthetic wastewater treatment. The influences of hydraulic retention time (HRT), air–liquid ratio (A/L) and recirculation on the removals of chemical oxygen demand (CODcr), ammonia (NH4+–N) and total nitrogen (TN) were discussed. The optimum operation conditions were obtained as HRT of 2.0h, A/L of 15:1 and 200% recirculation. Under the optimal conditions, 90% CODcr, more than 98% NH3–N and approximately 70% TN were removed. The average consumed volumetric loading rates for CODcr, NH4+–N and TN with 200% recirculation were 4.06, 0.36 and 0.29kg(m3d)−1, respectively. The CODcr and TN removal mainly occurred in the anoxic zone, while nitrification was completed at the height of 70cm from the inlet of the bottom due to a suitable column layout of biological aerated filter (BAF). The characteristics of wastewater and backwashing affected TN removal to a large degree. In addition, the features of media (SFCP) and synthetic wastewater contributed to a strong buffer capacity in the BAF system so that the effluent pH at different media height fluctuated slightly and was insensitive to recirculation.