Exjobbsförslag våren 2021: Fosforavskiljning från gråvatten med primärrening

Background

Source separation of domestic wastewaters in to blackwater (toilet waste) and greywater (from sinks, showers and cleaning) is being planned for a scale of 10,000 persons in the new city district of Östra Ramlösa in Helsingborg. A new way of managing wastewater is being planned with the less contaminated greywater being treated locally, thus minimising piping distances for 90% of the water flow.

Local greywater treatment plants are planned with discharge in to the local surface water body Lussebäcken. However, due to the poor water status of the receiving water body very strict effluent demands of phosphorus are to be expected (0.1 mg P/L or less).

NSVA (Nordvästra Skånes Vatten och Avlopp AB) operates the water and wastewater works in seven municipalities in northwestern Scania.

Objective

The main objective of this project is to evaluate the potential of primary precipitation as sufficient treatment of greywater to fulfil strict phosphorus demands.

Method

Jar tests is performed for determining good chemicals and dosage levels for coagulation and flocculation. Also further treatment with settling or filtration is performed in the laboratory.

When?

Spring 2021

Interested to perform this Master´s thesis?

Contact the one of the supervisors for the project.
Hamse Kjerstadius, development engineer, NSVA (hamse.kjerstadius@nsva.se)
Åsa Davidsson, associate professor, Lund University (asa.davidsson@chemeng.lth.se)