Print Email Facebook Twitter Reaching ultra low phosphorus concentrations by filtration techniques Title Reaching ultra low phosphorus concentrations by filtration techniques Author Scherrenberg, S.M. Contributor Van der Graaf, J.H.J.M. (promotor) Faculty Civil Engineering and Geosciences Department Sanitary Engineering Date 2011-02-11 Abstract This research deals with tertiary treatment techniques used for the removal of phosphorus from wastewater treatment plant (WWTP) effluent. The main objective of this research is to obtain ultra low total phosphorus (<0.15 mg total phosphorus/L) concentrations by coagulation, flocculation and filtration of wastewater treatment plant effluent. Knowledge of the different phosphorus forms in WWTP effluent is essential to reach ultra low concentrations in the WWTP effluent. The TU Delft phosphorus distribution has been developed to have an easy and quick method to determine orthophosphorus, metal-bound phosphorus, dissolved “organic” phosphorus and particulate organic phosphorus. The phosphorus distributions make it possible to compare the phosphorus removal of different filter concepts but it can also be used to compare different settings, for example flocculation time, initial mixing energy and filtration rates. Pilot-plant investigations were conducted at the Horstermeer WWTP and the Leiden Zuidwest WWTP. Results showed that the initial mixing energy has no influence on the phosphorus size fractionation and phosphorus distribution in the upper water layer of a fixed bed filter. This means that the initial mixing energy of 300 s-1 is already sufficient. During the filtration experiments, results showed that an increasing total phosphorus concentration in the feed water results in increased total phosphorus concentrations in the filtrate water. The coagulant dosage is a major influence on the filter runtime. With increasing coagulant dosage, the filter runtime decreases. For continuous sand filtration, an increase in the total phosphorus concentration in the feed water does not lead to higher total phosphorus concentrations in the filtrate water. 1-STEP® filtration reaches higher removal efficiencies compared to dual media filtration. It is to be concluded that phosphorus removal to an ultra low concentration can be achieved, but knowledge about the different phosphorus forms and their behaviour is of major importance. Subject phosphorus removalfiltrationphosphorus distribution To reference this document use: http://resolver.tudelft.nl/uuid:cd26515c-3de2-4c20-aab9-0b84103b7407 Publisher Water Management Academic Press Embargo date 2011-02-11 ISBN 9789089570192 Part of collection Institutional Repository Document type doctoral thesis Rights (c) 2011 Scherrenberg, S.M. Files PDF PS_FINAL_09012011.pdf 5.8 MB Close viewer /islandora/object/uuid:cd26515c-3de2-4c20-aab9-0b84103b7407/datastream/OBJ/view