Developmeny of Optimization Tool for Design and Maintenance of Biological Phosphate Removal Processes

虽然世界范围内对实际可行的除磷工艺的需求很大，但增强型生物除磷工艺（EBPR）的实际应用还没有达到预期的程度，因为它本身具有良好的潜力。本研究旨在结合现有的微生物学知识和数学建模技术，开发一个基本模型，该模型可以作为EBPR设计和控制的工具。并对模型的应用进行了讨论。通过实验研究确定了模型参数，考察了好氧、缺氧和厌氧条件对缓慢可生物降解有机物水解速率的影响。在缺氧或厌氧条件下，参与水解的酶的速率降低，因此水解速率降低。对于活性污泥模型的发展，在现有模型（IAWQ活性污泥模型）中引入糖原储存和磷酸盐积累生物的反硝化作用进行了试验，最后引入了后者。修正后的模型与日本两个污水处理厂的实际运行数据进行了校准。校准程序通过此校准过程标准化。对模型参数进行敏感性分析。建立的模型与实际植物的行为进行了比较。最初，我们试图总结一个设计和控制EBPR的手册，但时间不允许我们完成它。

Although the demands for practically feasible phosphate removal processe are worldwide, the enhanced biological phosphate removal processes (EBPR) have not been applied to actual situations to such an extent as is expected from their own excelloent potential. The present research aims at development of a basic model which can be a toolfor design and control of EBPR by combining available microbiological knowledge and mathematical modelling techniques. The application of the developed model are also discussed.Experimental studies were conducted to identify model parameters, in which effect of aerobic, anoxic and anaerobic conditions on the rate of hydrolysis of slowly biodegradable organic matters were investigated. Under anoxic or anaerobic conditions, the rate of enzymes involved in the hydrolysis decreased and, consequently the hydrolysis rate decreased.As for the development of activated sludege model, introduction of glycogen storage and denitrification by phosphate accumulating organismsinto the existing model (IAWQ activated sludge model) were tested, and finally the latter was introduced. The modified model were calibrated against actual operation data from two sewarage treatment plants in Japan. Calibration procedures were standardized through this calibration process. Asensitivity analysis was carried out to characterize model parameters. The behaviors of the developed model were compared with those of actual plants.Initially it was attempted to summarize a manual for design and control of EBPR,but time did not allow us to complete it.