富磷活性污泥高效释磷及磷回收技术研究OA

This study employed alkaline hydrolysis products of sludge as an external carbon source to enhance the anaerobic phosphorus release from phosphorus-rich activated sludge.The study investigated the optimal conditions for alkaline hydrolysis,the promoting effect of the hydrolysis products on phosphorus release,and the efficiency of phosphorus recovery from the anaerobic supernatant via magnesium ammonium phosphate(MAP)crystallization.The recovered product was characterized by SEM,FTIR,and XRD.The experimental results show that the optimal pH for sludge alkaline hydrolysis is 11.0,with a corresponding NaOH dosage of 0.10 g/g TSS.After 120 min of hydrolysis,the supernatant has SCOD of 1 713.1 mg/L and PO4-P concentration of 38.7 mg/L.Using the sludge hydrolyzed under these optimal conditions as the external carbon source,the phosphorus released from the activated sludge reaches 30.1 mg/L after 20 h of anaerobic incubation.Under the conditions of a Mg/P molar ratio of 1.4 and an N/P molar ratio of 1.4,the phosphorus recovery rate from the anaerobic supernatant of the phosphorus-rich sludge via MAP crystallization reaches 79.0%.The characterization results indicate that the primary component of the recovered product is magnesium ammonium phosphate,with a mass fraction of approximately 76%.