Patent ID: 11970415
Assignee: ZHEJIANG UNIVERSITY
Field: Environmental technology (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A sludge anaerobic fermentation treatment method with simultaneously enhanced acid production and phosphorus removal, comprising the following steps:
(1) adding waste activated sludge into an anaerobic reaction system, wherein a concentration of a total suspended solid TSS of the waste activated sludge is 10000-15000 mg/L, and a concentration of a volatile suspended solid VSS of the waste activated sludge is 6000-9000 mg/L; and
(2) adjusting a pH value of the waste activated sludge to 10±0.1 with a sodium hydroxide solution; adding magnetite into the waste activated sludge with an addition amount of 0.3-0.9 g/gVSS; removing air in a reactor, then sealing the reactor, and performing anaerobic fermentation for 10-15 days under stirring, while always maintaining the pH value of the waste activated sludge at 10±0.1 during the stirring and the fermentation,
wherein the magnetite is subjected to acid treatment prior to being mixed with the sludge, and a method for the acid treatment comprises:
placing and continuously stirring powdery magnetite in a reaction kettle while continuously adding a sulfuric acid solution of 93%-98% into the reaction kettle by atomization to form a porous structure on the surface of magnetite powders through reaction of the atomized sulfuric acid with a magnetite powder, wherein a mass ratio of the sulfuric acid solution to the magnetite added in the reaction kettle is 6-24:100.