Erdal Z K, Erdal U G, Randall C W
CH2MHILL, 3 Hutton Centre Drive, Suite 200, Santa Ana, CA 92707, USA.
Water Sci Technol. 2005;52(10-11):557-67.
Improved design strategies at BNR plants should include cost reductions so that the consumers and water authorities will be more willing to build EBPR plants instead of conventional activated sludge plants. Through efficient design, actual savings in construction and operation costs can be realized. For this reason, anaerobic stabilization of COD needs to be seriously considered during design for direct energy savings at the plants. The existence of anaerobic stabilization has been demonstrated through experimental work. Evaluation of operational data from existing plants has also indicated the definite presence of anaerobic stabilization at plants that include anaerobic zones for EBPR as part of their operation. By exploring the biochemical reactions taking place in EBPR process, particularly the involvement of the storage mechanisms for PHA, poly-P and glycogen storage, the potential mechanisms of the anaerobic stabilization of COD in EBPR systems was explored. The resultant balances pointed out the importance of glycogen metabolism in terms of conserving carbon and providing a sink for the reducing equivalents produced under aerobic conditions. This mechanism is different from those observed in anoxic-aerobic and conventional aerobic activated sludge systems, and appears to be at least partially responsible for the observed anaerobic stabilization of COD.
生物营养物去除（BNR）工厂改进的设计策略应包括降低成本，以便消费者和水务部门更愿意建设强化生物除磷（EBPR）工厂而非传统活性污泥工厂。通过高效设计，可实现建设和运营成本的实际节省。因此，在设计过程中需认真考虑化学需氧量（COD）的厌氧稳定化，以直接节省工厂能源。厌氧稳定化的存在已通过实验工作得到证明。对现有工厂运行数据的评估也表明，在将用于EBPR的厌氧区作为其运行一部分的工厂中，确实存在厌氧稳定化。通过探索EBPR过程中发生的生化反应，特别是聚羟基脂肪酸酯（PHA）、聚磷和糖原储存的储存机制的参与情况，研究了EBPR系统中COD厌氧稳定化的潜在机制。由此得出的平衡指出了糖原代谢在碳守恒以及为有氧条件下产生的还原当量提供汇方面的重要性。该机制不同于在缺氧 - 好氧和传统好氧活性污泥系统中观察到的机制，似乎至少部分地导致了所观察到的COD厌氧稳定化。
