基于数学模型的多模式AAO系统运行优化研究

构建了综合考虑出水水质、污泥产量和系统能耗的运行成本指数CPI,并利用数学模型对多模式厌氧/缺氧/好氧(AAO)系统的AAO、倒置AAO(RAAO)和缺氧/好氧(AO) 3种模式进行对比优化研究.在处理成本相近的前提下,在污泥龄5~25d范围内AAO模式的污染物去除效率和聚磷菌浓度明显高于RAAO和AO模式.在运行模式筛选的基础上,通过回流比优化确定了排放标准约束下AAO工艺的达标运行区域和最佳运行工况.动态模拟结果表明,优化工况能够显著改善出水水质,出水高于一级A的时间由78.4%下降至37.7%,CPI降低3.9%.

Model-based optimization of the multimode anaerobic/anoxic/aerobic system

The cost performance index (CPI) of a wastewater treatment plant operating with multimode anaerobic/anoxic/oxic (AAO) system was calculated based on effluent quality, sludge production and energy consumption using a mathematical model. The multimode AAO system could be operated under three modes: AAO, reversed AAO (RAAO) and anoxic/oxic (AO), and CPI for each mode was studied and compared. On the promise of similar operation costs, the AAO mode showed higher pollutants removal efficiency and concentration of phosphorus-accumulating organisms than RAAO and AO modes at sludge retention time of 5~25d. The optimal operation parameters and qualified operational region under discharge standard restraint were established for the AAO process by regulating recirculation ratios. Dynamic simulation results showed that under optimized operating condition, effluent quality was significantly improved with percentage of violation decreased from 78.4% to 37.7%, and the CPI index was reduced by 3.9%.