Location: Coastal Plain Soil, Water and Plant Conservation Research
Title: Separation of ammonia and phosphate minerals from wastewater using gas-permeable membranesAuthor
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Submitted to: Meeting Abstract
Publication Type: Abstract Only Publication Acceptance Date: 3/10/2017 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Conservation and recovery of nitrogen and phosphorus from animal wastes and municipal effluents is important because of economic and environmental reasons. In this paper we present a novel technology for separation and recovery of ammonia and phosphorus from liquid swine manure. Phosphorus recovery via magnesium precipitation was enhanced by combining it with ammonia recovery through gas-permeable membranes and low-rate aeration. The combination destroyed the natural carbonate alkalinity in the wastewater and increased pH, which accelerated ammonia uptake in the gas-permeable membrane system and improved the phosphate recovery. The process provided 100% phosphorus recovery efficiencies. Surprisingly, the magnesium phosphates produced contained very-high phosphate grade (46% P2O5) similar to commercial superphosphate fertilizer and consistent with the composition of a rare biomineral called newberyite that is found in guano deposits. This is an important finding because we were able to produce from wastes a valuable phosphate product with high P2O5 content favored by the fertilizer industry. |
