Separate nitrification of the reject water from dewatering of digested sludge has been studied at the Bromma sewage plant in Stockholm. Experimental studies were carried out in an SBR pilot plant. It was shown that a very high nitrification rate could be obtained in the reactor, about 30-40 g NH^-N/kg MLVSS, h. During the nitrification […]
Författare AGNES MOSSAKOWSKA, LARS-GUNNAR REINIUS, and BENGT HULTMAN,
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 […]
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 […]
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 […]
Författare BENGT CARLSSON, SERENA HASSELBLAD, ELZBIETA PLAZA, STEFAN MARTENSSON2 and CARL-FREDRIK LINDBERG
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 […]
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 […]
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 […]
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, […]
Författare HANS CARLSSON, HENRIK ASPEGREN, BENGT ANDERSSON and ANDERS HILMER
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 […]
Författare MAGNUS CHRISTENSSON och THOMAS WELANDER
Nyckelord (Keyword) Enhanced biological phosphorus removal (EBPR); Full scale treatment plant; Laborative model study; VFA-potential; sludge community.
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 […]
This paper presents the results of using mass balance calculations for the sludge transport to a secondary sedimentation tank after an activated sludge process with high sludge concentration. An activated sludge process with nitrogen removal often have high sludge concentration and a sludge with sludge settling characteristics. These factors give high sludge load on the […]
Författare MAGNUS EMANUELSSON och BERNDT BJÖRLENIUS
Nyckelord (Keyword) Sedimentation, Mass-Balance, Nitrogen removal, Clarification, Thickening, Field Study.
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