Öresundsverket in Helsingborg is the first municipal wastewater treatment plant in Sweden, designed and revamped for biological nitrogen removal. Different alternatives of phosphorus removal were used during the first two years of operation. The main purpose of this paper is to illustrate how the biological nitrogen removal has been influenced by the different phosphorus removal alternatives.Pre-precipitation had a positive effect on the nitrification rate, because of a lower carbon to nitrogen ratio. The other processes tested gave equivalent nitrification rates.Denitrification rates determined with acetate as single carbon source gave equivalent rates to all tested processes. Denitrification with methanol had an adaptation time of at least 1.5–2 months.The characteristics of the activated sludge varied substantially, diluted sludge volume index (DSVI) between 100 and 400 ml/g. The recirculation in the biological treatment is an important factor that influenced DSVI. A higher amount of easily biodegradable carbon had a positive effect on DSVI.Pre-precipitation gave high DSVIs with large variations from week to week.
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- Full-Scale Experiences from Biological Nitrogen Removal Combined with Different Phosphorus Removal Alternatives at Öresundsverket in Helsingborg
- Springer Berlin Heidelberg