Simulation and Optimization of domestic Wastewater Nutrients Removal Process: VFAs as External Carbon Source

摘要

The aim of this study is to investigate the effect of nutrient removal process by addition of volatile fatty acids (VFAs) as external carbon sources, and how a model can be applied to a pilot test system to simulate the system. The results showed that: the effect of nutrients removal can be substantially increased with the addition of VFAs: before the addition of VFAs, the removal rate of TN and TP are 22% and 26% respectively;;after the addition of VFAs, removal rates of TN and TP achieved 74% and 80% respectively. From an error analysis between simulated value and experimental value on the condition of external carbon addition, the average relative errors of CODcr, TN, NH3-N and N03-N are 9.5%,23.4%,36% and 22% respectively, which illuminated the correctness of the model;;optimum working conditions of the system established by the model are: internal reflux ratio is 200%,external reflux ratio is 75%,sludge retention time is 10d.