Recovering Ammonium-Nitrogen and Phosphorus through Struvite from Anaerobic Digested Effluent of Poultry Wastewater: Effects of Reagent Ratio and pH

Abstract:

Fermentation wastewater generated from livestock and poultry breeding contains high strength of ammonium-nitrogen and phosphorus, which has the huge nutrient recovery value. To recover nitrogen and phosphorus from the fermentation wastewater, struvite precipitate is a promising option. This paper focused on the ratios of reagent adding and pH optimizing during the ammonium and phosphate recycling through struvite precipitate. Using MgCl•6H₂O and NaHPO₄•12H₂O as precipitants, the optimum conditions were discussed in the paper. The results indicated that during a reaction time of 30min and a mixed speed of 100r/min , the ammonium and phosphate were removed by 89% and 88.7%, respectively at pH 10.5 and a molar ratio of Mg:N:P=1.2:1:1. In addition, it could reduce the organic matter content with a COD(Chemical Oxygen Demand ) removal efficiency of 36.2%. The recovered struvite had been suggested to display excellent fertilizer qualities, and also could be recycled and reused as a resource of nitrogen and phosphorus.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 1253-1259
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.1253
• Online since: January 2012
• Authors: Hong Rui Yang, Ya Lei Zhang, Ue Fei Zhou, Hong Guang Zhu
• Keywords: Fermentation Wastewater, Nitrogen and Phosphorus Recovery, pH Optimizing, Reagent Adding Ratio, Struvite

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