Operational strategies for an activated sludge process in conjunction with ozone oxidation for zero excess sludge production during winter season.
Operational strategies for an activated sludge process in conjunction with ozone oxidation for zero excess sludge production during winter season.
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DOI：
10.1016/j.watres.2004.10.004
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发表时间：
2005-04
期刊：
影响因子：
12.8
通讯作者：
J. W. Lee;H. Cha;K. Y. Park;K. Song;K. Ahn
中科院分区：
文献类型：
--
作者：
J. W. Lee;H. Cha;K. Y. Park;K. Song;K. Ahn
中试规模的活性污泥系统与污泥臭氧化工艺相结合，在冬季运行了 112 天，没有产生过多的污泥浪费。该工艺的概念是，产生的剩余污泥首先通过臭氧氧化分解，然后再循环至生物反应器，以矿化颗粒和可溶性有机化合物。操作的基础是确定每天臭氧化的最佳污泥量（以千克 SS 计）或在可变的进水化学需氧量 (COD) 负荷和温度条件下的最佳臭氧化频率，因为臭氧供应消耗昂贵的能源。使用理论估计的污泥生产率 (SP) 和实验获得的臭氧化频率 (n) 获得最佳 SO。虽然SP主要受到COD负荷的影响，但污泥浓度却受到冬季温度变化的影响。在 15°C 左右时观察到最佳 n 为 2.5 至 2.7，但在 10°C 时则增加了一倍。 15℃生物反应器中混合液悬浮固体（MLSS）浓度稳定在5000mg/L左右，但MLSS的挥发分固定在0.7左右，表明没有明显的无机积累。出水中的悬浮固体（SS）和可溶性COD始终保持在10和15mg/L的令人满意的水平，并具有充分的生物降解性。建议在可变进水 COD 负荷和温度条件下将动态 SO 应用到活性污泥系统，而不产生过量污泥，以节省能源并稳定系统。
A pilot-scale activated sludge system coupled with sludge ozonation process was operated for 112 days of a winter season without excess sludge wasting. The concept of this process is that the excess sludge produced is first disintegrated by ozone oxidation and then recirculated to a bioreactor in order to mineralize the particulate and soluble organic compounds. The basis of operation was to determine either the optimal amount of sludge in kg SS ozonated each day (SO) or the optimal ozonation frequency under the variable influent chemical oxygen demand (COD) loading and temperature conditions, since the ozone supply consumes costly energy. The optimal SO was obtained using the theoretically estimated sludge production rate (SP) and experimentally obtained ozonation frequency (n). While the SP was mainly subject to the COD loadings, sludge concentration was affected by the temperature changes in winter season. The optimal n was observed between 2.5 and 2.7 at around 15°C, but it was doubled at 10°C. Mixed liquor suspended solids (MLSS) concentration was leveled off at around 5000mg/L in bioreactor at 15°C, but the volatile fraction of MLSS was fixed around 0.7 indicating that there was no significant inorganic accumulation. Suspended solids (SS) and soluble COD in effluents kept always a satisfactory level of 10 and 15mg/L with sufficient biodegradation. It was recommended to apply a dynamic SO under variable influent COD loadings and temperature conditions to the activated sludge system without excess sludge production for saving energy as well as system stabilization.