MODELLING THE DYNAMICS OF WASTEWATER TREATMENT PROCESSES / Modellering av dynamiska förlopp i vattenreningsprocesser
The main objective of the paper is to briefly describe and exemplify some of the work that has been carried out within the STAMP project at IEA at Lund Institute of Technology within the field of mathematical modeling of wastewater treatment (WWT) processes. Three main areas have been identified – reduced-order models of the activated […]
BIOLOGISK FOSFORAVSKILJNING UNDER LUPPEN / Enhanced biological phosphorus removal under the magnifier
As part of the Swedish research program STAMP (Swedish abbreviation for Control ofWastewater Treatment Plants – Method and Processes) funded by the Swedish National Board for Technical Development, three Ph.D.-students at the Department of Biotechnology, Lund University, have been working with applied research in close collaboration with other University departments and with local full scale […]
NITROGEN REMOVAL IN A SINGLE SLUDGE EBPR PROCESS / Kväveavskiljning i en bio-P process
Studies on enhanced biological phosphorus removal (EBPR) in activated sludge processes have been conducted on a pilot plant at the Sjolunda wastewater treatment plant in Maimo, Sweden, since 1986. The plant receives wastewater from a combined sewer system. The aim of this study was to investigate the consequences of combining EBPR with biological nitrogen removal, […]
PILOT EXPERIMENTS USED FOR DESIGN OF ACTIVATED SLUDGE SYSTEMS – SOME POSSIBILITIES AND PITFALLS / Pilotförsök som grund for dimensionering – nagra fällor och mojiigheter
Two pilot plant set-ups, used to obtain information on a denitrifying non-nitrifying activated sludge system and its usefulness in full-scale, are compared and evaluated. The pilot plant data are used to illustrate effects of simplification of a complex problem in pilot scale. A simple pilot plant supplied with a constant How of wastewater was useful […]
THE EFFECT OF DISSOLVED OXYGEN CONCENTRATION ON THE SETTLING PROPERTIES OF ACTIVATED SLUDGE / Effekten av syrehalt pa sedimenteringsegenkaperna hos aktivt slam
Long-term effects of dissolved (DO) concentration on the settling properties of activated sludge were studied in continuous completely-mixed pilot-plant reactors. Lower DO concentrations (0.5-2.0 mg/1) gave poorer settling properties and higher turbidities of the effluent than higher DO concentrations (2.0-5.0 mg/1). The main reasons to the deteriorated settling properties were excessive growth of filamentous bacteria […]
MODELLING NITRIFYING TRICKLING FILTERS / Modellering av nitrifierande biobäddar
Nitrifying trickling filters (NTFs) have attained renewed attention due to increasing demands on nitrogen re moval in municipal waste-water treatment. For improved control of wastewater treatment plants (WWFPs), using NTFs, models of the filters are almost indispensable. Furthermore, models may be used to improve the understanding of the process and for studying new operational strategies […]
DESIGN AND OPERATION OF A PILOT-SCALE ACTIVATED SLUDGE PLANT / Utformning och drift av en aktivslamanläggning i pilotskala
This paper describes the design and operation of a novel pilot-scale activated sludge plant located at the main municipal wastewater treatment plant in Uppsala, Sweden. The pilot plant consists oftwo separate lines for predenitrification. The main purpose of the plant has been to study new methods for efficient nutrient removal using advanced process technology, applied […]
EFFECTS OF WEIGHTING AGENTS AND SEEDED NITRIFICA- TION BACTERIA ON THE ACTIVATED SLUDGE PROCESS – EVALUATION BY USE OF SIMPLE MODELS / Effekter av tyngande material och inympade nitrifikationsbakterier på aktivslamprocessen – Utvärdering med hjälp av enkla modeller
Many possibilities are available to improve the efficiency of the activated sludge process and to decrease the necessary volume needs. Examples include the use of dosage of weighting agents and seeding of nitrification bacteria to the activated sludge process. Simple models were developed in order to predict the effects of these methods. One model was […]
PHOSPHORUS REMOVAL AND DENITRIFICATION IN DEEP-BED TWO-MEDIA FILTERS / Fosforavskiljning och denitrifikation i djupa tvamediafilter i Henriksdals reningsverk i Stockholm
Simultaneous suspended solids separation, denitrification, and phosphorus precipitation in a down-flow filter were studied as a final process step at Henriksdal treatment plant. The research was performed in a stainless steel tube with a diameter of 0.4 metre filled with sand of different grain sizes and layer heights over a layer with expanded clay. The […]