Dynamic modelling of phosphorus in a nutrient-deficient COD removal system

• n this paper a new model, tailor-made for nutrient deficient aerobic COD removal, is presented. The Activated Sludge Model No. 1 is chosen as a basis for model development. The original model is extended to include (1) phosphorus state variables; (2) phosphorus and nitrogen limited heterotrophic growth; (3) additional 'luxury' uptake of phosphorus and (4) a separate active biomass component to model predation by higher-order organisms, e.g. protozoa. The phosphorus states are included to model phosphorus consumption in biological growth. Nutrient limitations are modelled using Monod functions. The conventional heterotrophic biomass is assumed to be the only source of carbon and nutrients for the higher-order organisms. The model is reduced in the sense that it only regards aerobic conditions and it omits autotrophic organisms. A measurement campaign carried out at the wastewater treatment plant at Hylte pulp and paper mill in Sweden, together with dynamic phosphorus dosage data, is used for model validation and influent fractionation. Dynamic simulations show that the proposed model represents a possible avenue for upgrading activated sludge models to take into account nutrient deficiency and delayed responses due to variable COD:P ratios within active biomass.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Publikations- och innehållstyp

kon (ämneskategori)

ref (ämneskategori)