US 11,952,298 B2
Method for deodorizing sludge with metal salt and tannin extract together, deodorized sludge, and use thereof
Minghua Liu, Fuzhou (CN); Jiantao Lin, Fuzhou (CN); Shuyu Jiang, Fuzhou (CN); Yuchuan Yang, Fuzhou (CN); Yuxin Zhou, Fuzhou (CN); and Yifan Liu, Fuzhou (CN)
Assigned to FUZHOU UNIVERSITY, Fuzhou (CN)
Appl. No. 18/287,034
Filed by FUZHOU UNIVERSITY, Fuzhou (CN)
PCT Filed Oct. 15, 2021, PCT No. PCT/CN2021/123978
§ 371(c)(1), (2) Date Oct. 16, 2023,
PCT Pub. No. WO2022/227418, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. 202110454842.4 (CN), filed on Apr. 26, 2021.
Prior Publication US 2024/0083798 A1, Mar. 14, 2024
Int. Cl. C02F 11/00 (2006.01)
CPC C02F 11/00 (2013.01) [C02F 2303/02 (2013.01)] 13 Claims
 
1. A method for deodorizing sludge with a metal salt and a tannin extract together, comprising the following steps:
in parts by weight, uniformly mixing 9320-9910 parts of to-be-deodorized sludge and 20-100 parts of a metal salt treatment solution, and adding a mixture of 50-500 parts of a tannin extract treatment solution and 20-80 parts of a pH adjuster, to obtain a sludge deodorization reaction system, wherein the metal salt treatment solution is an aqueous solution containing 0.5%-2.5% of one or more of ferrous sulfate, ferric sulfate, ferric nitrate, and ferrous ammonium sulfate, the tannin extract treatment solution is an aqueous solution containing 5%-50% of one or more of a Myrica rubra tannin extract, a larch tannin extract, a valonea tannin extract, a quebracho tannin extract, and a wattle tannin extract, and
controlling a pH value of the sludge deodorization reaction system to be 6.2-7.5, and stirring the sludge deodorization reaction system at a speed of 15-120 r/min for 1-3 h, prior to standing for 12-48 h.