Nitrogen recovery from biogas slurry with high ammonia nitrogen concentration through struvite precipitation utilizing acid leaching solution of collophanite tailings

• DOI: 10.2166/wst.2024.296
• Publication Date: 2024-08-29T16:10:44Z
• Authors: Jiajia Zhang; Hanlin Wang; Haibo Liu; Xuehua Zou; Dong Chen; Xiaoji Liu; Tianhu Chen
• Keywords: Struvite; Biogas

ABSTRACT The high concentration of ammonia nitrogen (NH4+) and chemical oxygen demand (COD) in biogas slurry pose great challenges to the efficiency traditional wastewater treatment systems. Collophanite tailings are solid waste, characterized by significant concentrations phosphorus (PO43-) magnesium (Mg2+), represent a potential resource for reduction recovery NH4+ via struvite precipitation. This study systematically explored optimal leaching parameters employing sulfuric acid extraction PO43− Mg2+ from collophanite tailings. effect [PO43-]:[NH4+] molar ratio pH on was investigated. physicochemical properties precipitates were confirmed using X-ray diffraction (XRD), scanning electron microscopy (SEM), analysis. Results suggested that highest removal (88.5%) achieved when 1.0 at 9.5. Evaluation effluent quality demonstrates enhancement biodegradability treated slurry, evidenced an increase COD/TN increased 2.1 10.4. Economic analysis shows net income would be approximately 21.33 USD/m3 proposed produces. These findings underscore utilizing slurry.