Real-time control strategy for simultaneous nitrogen and phosphorus removal using aerobic granular sludge.
Real-time control strategy for simultaneous nitrogen and phosphorus removal using aerobic granular sludge.
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DOI：
10.2166/wst.2008.410
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
N. Kishida;S. Tsuneda;Yutaka Sakakibara;J. H. Kim;R. Sudo
中科院分区：
文献类型：
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作者：
N. Kishida;S. Tsuneda;Yutaka Sakakibara;J. H. Kim;R. Sudo
为实现序批式反应器（SBR）中好氧颗粒污泥脱氮除磷的同步稳定运行，建立了一种实时控制策略，通过监测电导率（EC）和pH值的时间导数来确定处理周期中磷酸盐释放、硝化和反硝化的终点以及厌氧、好氧和缺氧阶段的最佳时间长度.虽然反应器中的生物量浓度在启动期间急剧波动，因为很短的污泥沉降时间形成好氧颗粒污泥，适当的处理周期长度自动调整在这个控制系统。即使当进水特性发生明显波动时，在准稳态前和准稳态时均能成功地实现稳定的脱氮除磷。出水NH_4-N、NO_x-N和PO_4-P浓度始终低于0.3mg/L。另一方面，当厌氧/好氧/缺氧阶段的时间长度固定时，不能实现稳定的脱氮除磷。因此，所设计的控制系统对于获得稳定的好氧颗粒污泥同步脱氮除磷处理性能是非常有效的。
To achieve stable and simultaneous removal of nitrogen and phosphorus using aerobic granular sludge in a sequencing batch reactor, a real-time control strategy was established, where time derivatives of electric conductivity (EC) and pH were monitored to facilitate the determinations of ends of phosphate release, nitrification and denitrification as well as corresponding optimum time-lengths of anaerobic, oxic, and anoxic phases in treatment cycles. Although biomass concentration in a reactor drastically fluctuated at the startup period because of very short sludge settling time for the formation of aerobic granular sludge, cycle length for proper treatment was automatically adjusted in this control system. Even when characteristics of influent wastewater markedly fluctuated, stable nitrogen and phosphorus removal was successfully attained both before and at pseudo-steady-state. Effluent concentrations of NH4-N, NOx-N and PO4-P were always lower than 0.3 mg/L. On the other hand, when time lengths of the anaerobic/oxic/anoxic phases were fixed, stable nitrogen and phosphorus removal was not accomplished. Therefore, it is clear that the designed control system is very effective to obtain stable treatment performance in simultaneous nitrogen and phosphorus removal by aerobic granular sludge.