Alternatives for the management of pig slurry: Phosphorous recovery and biogas generation. (August 2019)

• Record Type: Journal Article
• Authors: Luján-Facundo, M.J.; Iborra-Clar, M.I.; Mendoza-Roca, J.A.; Also-Jesús, M.
• Is Part Of: Journal of water process engineering. Volume 30(2019)
• Publication Date: 2019-08
• Subjects: Pig slurry -- Nutrients -- Struvite -- Anaerobic digestion; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2017.08.011
• Languages: English
• ISSNs: 2214-7144

Abstract

Highlights: Alternatives in the management of pig slurry were studied. Optimal conditions to struvite formation were Mg +2 /PO4 −3 of 2.8, pH 10 and 22 °C. Co-digestion is necessary for increase the C/N relationship for biogas production. The maximum biogas generated volume was around 4 mL h −1 . Abstract: Pig slurry is highly polluted waste stream characterized by its high nutrients content and its high organic matter concentration. In this research, two alternatives in the management of this wastewater were studied. On the one hand, removal of nutrients from piggery wastewater by struvite precipitation was evaluated. Different molar ratios Mg +2 /PO4 −3, pH and temperatures were tested. On the other hand, an anaerobic treatment was performed with and without previous struvite crystallization and the methane production was analyzed. Results showed that the optimal experimental conditions to achieve the highest ammonium nitrogen and phosphate removal percentages (62.01% and 66.96%, respectively) were a molar concentration ratio (Mg +2 /PO4 −3 ) of 2.8, pH of 10 and temperature of 22 °C. In addition, images from FE-SEM microscopy demonstrated that the struvite morphology was orthorhombic. Concerning the anaerobic digestion, the chemical oxygen demand removal efficiencies were 59.87% and 52.25% for the treatment without previous struvite precipitation and with previous struvite precipitation, respectively. Furthermore, the maximum biogas potential was found when no previous struvite precipitation was carried out, with a biogas generation around 4 mL h −1 and a percentage of methane in the biogas between 32.37 and 59.73%.