Modeling Full-scale Granular Sludge Sequencing Tank Performance

摘要

This paper presents the calibration of a Bio Win model to the performance of a full-scale Nereda® nutrient removal plant at Garmerwolde, Netherlands. The approach to modeling granular sludge sequencing tanks (GSST) is discussed. A one-dimensional dynamic biofilm model is merged with a general Activated Sludge/Anaerobic Digestion model (ASDM) and a one-dimensional layered solids flux model in a variable volume unit. The GSST model has been developed to balance pragmatic design with mechanistic modeling rigour. A dynamic solver generates fast solutions and allows interactive design and analysis. The calibrated GSST model accurately predicts key aspects of the observed full-scale Garmerwolde Nereda® plant over the period from March to December, 2014: sludge production; total system mass, and fraction of the total mass in the granular phase; dynamic biological removal of carbon, nitrogen and phosphorous within the Nereda® tank; aeration requirements; and effluent concentrations.