US 12,304,842 B2
Method for recovering phosphorus from sludge rich in chemical phosphorus precipitates using high-protein biomass waste
Yongmei Li, Shanghai (CN); Zhipeng Zhang, Shanghai (CN); Qian Ping, Shanghai (CN); Wenjie Guo, Shanghai (CN); and Lin Wang, Shanghai (CN)
Assigned to TONGJI UNIVERSITY, Shanghai (CN)
Filed by TONGJI UNIVERSITY, Shanghai (CN)
Filed on Jul. 11, 2022, as Appl. No. 17/861,322.
Claims priority of application No. 202110782246.9 (CN), filed on Jul. 12, 2021.
Prior Publication US 2023/0008207 A1, Jan. 12, 2023
Int. Cl. C02F 11/04 (2006.01); C01B 25/00 (2006.01); C02F 11/122 (2019.01); C02F 11/127 (2019.01); C02F 11/143 (2019.01)
CPC C02F 11/04 (2013.01) [C01B 25/003 (2013.01); C02F 11/122 (2013.01); C02F 11/127 (2013.01); C02F 11/143 (2019.01)] 5 Claims
OG exemplary drawing
 
1. A method for recovering phosphorus from sludge rich in chemical phosphorus precipitates using a high-protein biomass waste, comprising steps of:
(1) introducing the sludge rich in chemical phosphorus precipitates into an anaerobic fermenter, adding a high-protein biomass waste in proportion according to a total chemical oxygen demand of the sludge, removing oxygen to form an anaerobic environment, sealing the fermenter, and co-fermenting the sludge and the high-protein biomass waste at 25-35° C. for 4-7 days, to effectively release phosphorus from the sludge rich in chemical phosphorus precipitates;
(2) dewatering the sludge after being co-fermented in the step (1) to obtain a dewatered sludge liquor; and
(3) adding an appropriate amount of a magnesium salt to the dewatered sludge liquor obtained in the step (2), adjusting pH to 7.5-9.0, stirring for 30 minutes and then standing for precipitation to obtain struvite crystals, and recovering the phosphorus in a form of the struvite crystals from the sludge,
wherein the high-protein biomass waste comprises silkworm chrysalis powder.