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Mathematical Modelling of Nutrients in Facultative Waste Stabilisation Ponds

其他書名	Development of Mathematical Model to Describe the Fate of Carbon, Nitrogen and Phosohorus in a Facultative Waste Stabilisation Pond
出版	1995
URL	http://books.google.com.hk/books?id=rzW1zQEACAAJ&hl=&source=gbs_api

註釋In this study, various dynamic models related to facultative wastewater stabilisation pond(FWSP) have been studied. It is concluded that existing dynamic models of FWSP only include a simplistic model of the regeneration of nutrients from benthal region to water column. As a result of this, a new mathematical model which considers the sediment and water column interactions has been developed. This model is divided into two parts which are water column nutrient submodel and sediment nutrient submodel. In the former submodel, all the biochemical reactions as described by Fritz[1985] plus precipitation, adsorption, volatilisation of ammonia and organic matter settlings were included. In the latter, the work of van Der Molen[1991] on modelling phosphorus release from lake sediments is extended and adapted to include nitrogen and carbon exchanges in FWSP. The model has been calibrated against data from a pond in New Mexico [Larsen, 1974] and validated using a data set from a pond in South-West Ireland treating dairy waste [Hunter,1992]. Sensitivity studies on the model various coefficients were done to determine their stability in the model. A statistical t-distribution for the paired comparison between observed and computed values was also carried out. All the computed values are significant within the 95 percent level except for ammonia. Results show a good correlation between the measured values and those predicted by the computer simulation. From this study, the fate of nutrients in FWSP has been highlighted. This will guide the future monitoring efforts as the model has indicated the important processes that appear to control effluent water quality in ponds, and thus indicate areas for further study.