ID:
publications-2817
Type:
Peer reviewed articles
Year:
2019
Authors:
Sara Johansson, MaĂ«l Ruscalleda, Bart Saerens, JesĂșs Colprim
Title:
Potassium recovery from centrate: taking advantage of autotrophic nitrogen removal for multi-nutrient recovery
Venue/Journal:
Journal of Chemical Technology & Biotechnology
DOI:
10.1002/jctb.5828
Research type:
Uncategorized
Water System:
Wastewater Treatment Plants
Technical Focus:
Abstract:
AbstractBACKGROUNDPotassium is a key macronutrient, but little attention has been paid to its recovery from waste streams. This study investigates simultaneous recovery of phosphorus and potassium in the form of potassium struvite (MgKPO4·6H2O) from centrate after nitrogen removal by partial nitritationâanammox (PNA). Labâscale batch experiments to assess the influence of pH, Mg:P ratio and temperature on nutrient removal were conducted on effluent from two PNA reactors fed with centrate from municipal wastewater treatment plants.RESULTSpH had a strong impact on potassium removal, which increased up to pHâ11. At this pH, a product containing 11.4% P, 3.51% N and 4.34% K was obtained. Xâray diffraction confirmed the presence of potassium struvite together with ammonium struvite (MgNH4PO4.6H2O). PNA reduced the alkalinity by 90%, which surpasses the performance of conventional CO2 stripping by aeration.CONCLUSIONCoupling PNA with struvite precipitation allows for the recovery of N, P and K in a multiânutrient product and may drastically reduce the need for alkali dosing for pH control. © 2018 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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