US 12,421,149 B2
Method for promoting methane production from sludge by anaerobic digestion in high ammonia-nitrogen habitat using biochar with high C/N ratio
Lin Wang, Shanghai (CN); Yunpeng He, Shanghai (CN); Yongmei Li, Shanghai (CN); Qian Ping, Shanghai (CN); Yuqian Lin, Shanghai (CN); and Zhicheng Xi, Shanghai (CN)
Assigned to TONGJI UNIVERSITY, Shanghai (CN)
Filed by TONGJI UNIVERSITY, Shanghai (CN)
Filed on Nov. 7, 2022, as Appl. No. 17/981,533.
Claims priority of application No. 202210479834.X (CN), filed on May 5, 2022.
Prior Publication US 2023/0357066 A1, Nov. 9, 2023
Int. Cl. C02F 11/04 (2006.01); C02F 1/28 (2023.01); C02F 11/00 (2006.01); C02F 101/16 (2006.01)
CPC C02F 11/04 (2013.01) [C02F 1/283 (2013.01); C02F 11/004 (2013.01); C02F 2101/16 (2013.01); C02F 2303/06 (2013.01); Y02E 50/30 (2013.01); Y02W 30/40 (2015.05)] 4 Claims
OG exemplary drawing
 
1. A method for promoting methane production from sludge by anaerobic digestion in a high ammonia-nitrogen habitat using a biochar material, comprising adding a biochar material to an amount of sludge; and carrying out an anaerobic digestion treatment, wherein the biochar material is prepared by dry distillation by heating to 360° C.;
wherein the high ammonia-nitrogen habitat has an ammonia nitrogen concentration in the sludge between 2000-4500 mg/L;
wherein the concentration of the biochar material added to the sludge is 12 g/L;
wherein a reaction time of the anaerobic digestion treatment is about 52 d;
wherein the sludge is municipal sludge with a total solids concentration (TS) of 127.9 g/L; and
wherein the biochar material has following composition: 85.5% of C, 2.8% of N, 10.53% of O, 0.93% of P, and 0.39% of S; and the biochar material has a specific surface area of 15.6736 m2/g and a pore volume of 0.118444 cm3/g.