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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)

Abstract

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.

Keywords

Ammonia recovery Phosphorus recovery Newberyite 

References

  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
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  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

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