Modeling COD, N and P removal in a full-scale wwtp Haarlem Waarderpolder

In this study the following was evaluated: (a) application of a complex activated sludge model on a full-scale plant (Phostrip®-like process), (b) influent and sludge characterization procedures for bio-P modeling, (c) the use of batch tests for model evaluation and (d) different alternative BPR process configurations (A/O, UCT and BCFS®). An integrated model for aerobic and denitrifying biological phosphorus removal (Delft bio-P model) replaced the module for P removal of ASM No. 2 and was combined with retained equations for COD and N conversion of the ASM No 2. This combined model proved well capable of describing the wastewater treatment plant (wwtp) Haarlem Waarderpolder with adjustment of only three (out of the sixty) default parameters. Some of batch tests were satisfactorily described by the model too. Batch tests proved as a useful tool for sludge characterization and model validation. The standard Dutch procedure for influent and sludge characterization proved satisfactory for the model construction. Modeling of alternative BPR process configuration showed that good P removal was achieved by all three alternative process configurations, by the latest one with comparatively lowest construction and operational costs (lower building costs and no acetate addition). Valuable experience from practical application of the model was obtained; study indicated where the model should be improved; the plant operation and treatment processes were better understood and plant performance was further optimized.