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Tertiary phosphorus removal to extremely low levels by coagulation-flocculation and cloth-filtration

Fundneider, Thomas and Alejo, Luz and Lackner, Susanne (2020):
Tertiary phosphorus removal to extremely low levels by coagulation-flocculation and cloth-filtration.
In: Water Science and Technology, IWA Publishing, ISSN 0273-1223,
DOI: 10.2166/wst.2020.337,
[Article]

Abstract

Higher standards in the European water framework directive and national directive demand advanced wastewater treatment for removal of nutrients and organic micropollutants before the discharge into water bodies. Systematic investigations regarding relative dosage and filtration processes for removal of flocculated solids are currently lacking. In this study, the performance of technologies for advanced removal of total phosphorus down to <100 μg/L with pile cloth-filtration (CF) and membrane filtration was verified and synergy effects for the removal of other contaminants were identified. The results show that an over-stoichiometric addition of coagulants of >5 mol Me3+/mol sRP was necessary to achieve soluble reactive phosphorus (sRP) concentrations of <50 μg/L in the effluent. After the coupled process of tertiary phosphorus removal and solids removal, the soluble nonreactive phosphorus (sNRP) concentration regulates the lowest total phosphorus effluent concentration. sNRP is also partially, but not completely, removed by the use of coagulants. CF has proven to be an alternative technology for the removal of phosphorus and total suspended solids below the detection limit.

Item Type: Article
Erschienen: 2020
Creators: Fundneider, Thomas and Alejo, Luz and Lackner, Susanne
Title: Tertiary phosphorus removal to extremely low levels by coagulation-flocculation and cloth-filtration
Language: English
Abstract:

Higher standards in the European water framework directive and national directive demand advanced wastewater treatment for removal of nutrients and organic micropollutants before the discharge into water bodies. Systematic investigations regarding relative dosage and filtration processes for removal of flocculated solids are currently lacking. In this study, the performance of technologies for advanced removal of total phosphorus down to <100 μg/L with pile cloth-filtration (CF) and membrane filtration was verified and synergy effects for the removal of other contaminants were identified. The results show that an over-stoichiometric addition of coagulants of >5 mol Me3+/mol sRP was necessary to achieve soluble reactive phosphorus (sRP) concentrations of <50 μg/L in the effluent. After the coupled process of tertiary phosphorus removal and solids removal, the soluble nonreactive phosphorus (sNRP) concentration regulates the lowest total phosphorus effluent concentration. sNRP is also partially, but not completely, removed by the use of coagulants. CF has proven to be an alternative technology for the removal of phosphorus and total suspended solids below the detection limit.

Journal or Publication Title: Water Science and Technology
Publisher: IWA Publishing
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR > Wastewater Engineering
Date Deposited: 02 Sep 2020 05:11
DOI: 10.2166/wst.2020.337
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