Recovery of Ammonia and Production of High-Grade Phosphates from Side-Stream Digester Effluents Using Gas-Permeable Membranes

  • M. B. VanottiEmail author
  • P. J. Dube
  • A. A. Szogi
Conference paper
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 4)


Phosphorus recovery was combined with ammonia recovery using gas-permeable membranes. In a first step, the ammonia and alkalinity were removed from municipal side-stream wastewater using low-rate aeration and a gas-permeable membrane manifold. In a second step, the phosphorus was removed using magnesium chloride (MgCl2) and reduced amounts of alkali. The side-stream wastewater contained 730 mg N/L, 140 mg P/L and 2900 mg/L alkalinity. The process recovered approximately 79–93% of the ammonia and 80–100% of the phosphorus. Surprisingly, the phosphates produced were very-high grade (42–44% P2O5) with a composition similar to the bio-mineral newberyite. However, lower grade phosphate products (27–29% P2O5) were produced whenever the N recovery step was bypassed or carbonate alkalinity was added. Therefore, removal of ammonia and alkalinity are important considerations for production of very-high grade phosphate product.


Ammonia recovery Phosphorus recovery Newberyite 


  1. Dube PJ, Vanotti MB, Szogi AA, García-González MC (2016) Enhancing recovery of ammonia from swine manure anaerobic digester effluent using gas-permeable membrane technology. Waste Manag 49:372–377CrossRefGoogle Scholar
  2. García-González MC, Vanotti MB, Szogi AA (2015) Recovery of ammonia from swine manure using gas-permeable membranes: effect of aeration. J Environ Manag 152:19–26CrossRefGoogle Scholar
  3. Vanotti MB, Szogi AA (2015) Systems and methods for reducing ammonia emissions from liquid effluents and for recovering ammonia. U.S. Patent 9,005,333 B1. U.S. Patent and Trademark OfficeGoogle Scholar
  4. Vanotti MB, Szogi AA, Dube PJ (2016) Systems and methods for recovering ammonium and phosphorus from liquid effluents. U.S. Patent Application 15/170,129. U.S. Patent and Trademark OfficeGoogle Scholar
  5. Vanotti MB, Dube PJ, Szogi AA (2017) Recovery of ammonia and phosphate minerals from swine wastewater using gas-permeable membranes. Water Res. doi: 10.1016/j.watres.2017.01.045 Google Scholar

Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.United States Department of AgricultureAgricultural Research Service, Coastal Plains Soil, Water and Plant Research CenterFlorenceUSA

Personalised recommendations