US 12,122,696 B2
Method of reducing and controlling hazardous substance in process of high-value biological conversion of urban organic waste
Yinguang Chen, Shanghai (CN); Xiong Zheng, Shanghai (CN); Leiyu Feng, Shanghai (CN); Haining Huang, Shanghai (CN); Jianying Xiong, Shanghai (CN); Xin Zhang, Shanghai (CN); and Lei Dong, Shanghai (CN)
Assigned to Tongji University, Shanghai (CN); and Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai (CN)
Filed by Tongji University, Shanghai (CN); and Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai (CN)
Filed on Dec. 24, 2021, as Appl. No. 17/561,860.
Claims priority of application No. 202110086988.8 (CN), filed on Jan. 22, 2021.
Prior Publication US 2022/0234932 A1, Jul. 28, 2022
Int. Cl. C02F 11/04 (2006.01); B09B 3/65 (2022.01); C02F 1/66 (2023.01); C02F 3/34 (2023.01); C02F 11/00 (2006.01); C02F 11/02 (2006.01); C02F 11/14 (2019.01); C02F 11/147 (2019.01); C12P 7/52 (2006.01); C12P 7/54 (2006.01); C12P 7/56 (2006.01); C12P 39/00 (2006.01); B09B 101/70 (2022.01); C02F 101/10 (2006.01); C02F 101/20 (2006.01); C02F 101/22 (2006.01); C02F 101/34 (2006.01); C02F 101/38 (2006.01); C02F 103/34 (2006.01)
CPC C02F 11/04 (2013.01) [B09B 3/65 (2022.01); C02F 1/66 (2013.01); C02F 11/004 (2013.01); C02F 11/02 (2013.01); C02F 11/147 (2019.01); C12P 7/52 (2013.01); C12P 7/54 (2013.01); C12P 7/56 (2013.01); C12P 39/00 (2013.01); B09B 2101/70 (2022.01); C02F 3/341 (2013.01); C02F 2101/103 (2013.01); C02F 2101/20 (2013.01); C02F 2101/22 (2013.01); C02F 2101/34 (2013.01); C02F 2101/38 (2013.01); C02F 2101/40 (2013.01); C02F 2103/343 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of reducing and controlling a hazardous substance in a process of biological conversion of an urban organic waste, comprising the following steps:
1) Acclimation stage: mixing a sludge, a first urban organic waste and a first organic acid solution with water in a mixture for acclimation to obtain an acclimatized sludge;
2) Stage 1 of biological conversion: mixing the acclimatized sludge with a second urban organic waste to perform anaerobic culture;
3) Stage 2 of biological conversion: adding nitrate and bacteria to continue anaerobic culture so as to obtain a second organic acid solution and a residue;
wherein the mixture has a first amount of the hazardous substance; the second urban organic waste has a second amount of the hazardous substance; the residue has a third amount of the hazardous substance; and wherein the third amount is lower than a total of the first amount and the second amount; and
wherein the hazardous substance comprises at least one of heavy metals and antibiotics.