好氧颗粒污泥代谢高浓度有机废水的数学模拟

Mathematical simulation of aerobic granular sludge metabolizing high-concentration organic wastewater

为促进好氧颗粒污泥技术的实际应用,结合COD(Chemical Oxygen Demand)、OUR(Oxygen Uptake Rate)数据修正ASM3(Activated sludge model No.3)模型,建立可描述好氧颗粒污泥代谢高浓度有机废水过程的数学模型,并提出测定部分动力学参数的新方法.试验中好氧颗粒污泥系统未测得自养硝化作用.异养菌产率系数YHS、存储产率系数YSTO、直接利用底物最大比增长速率μHS、最大存储产率kSTO、衰减系数bH分别为0.7、0.95、0.11 h-1、0.4 h-1、0.014 h-1.模型能准确模拟反应器运行工况.模拟结果表明,异养微生物利用外源底物生长,维持基础代谢,并同时进行存储.在底物富余时期,好氧颗粒污泥利用外源底物存储多余生长.当外源底物消耗完后利用存储物质生长并维持基础代谢.

Simulating the metabolic process of high concentration organic waste water by aerobic granular sludge （AGS） is significant for the practical application of aerobic granular sludge technology. In this study, chemical oxygen demand （COD） and oxygen uptake rate （OUR） were investigated in batch reactor; ASM3 was modified according to the test data; and part of the model parameters were measured. No autotrophic nitrification was found in this test. The measurement results showed the heterotrophic bacteria yield （YHs） as 0.7, storage yield （YSTO） as 0.95, maximum growth rate on Ss （μHS） as 0.11 h-1, maximum storage rate （kSTO） as 0.4 h-1, and decay coefficient （bH） as 0.014 h-1. The model described the experimental data from this system sufficiently. The simulation results show that heterotrophic microorganisms utilize exogenous substrates for growth, maintain basal metabolism and transform the substances to store materials simultaneously. The AGS use more substances for storage than for growth in the feast period. When the substances are used up, the AGS utilize storage materials to grow and maintain the basic metabolism.