| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil- and fat-containing wastewater treatment method and apparatus that reduce the amounts of oil and fat, and solids contained in oil- and fat-containing organic wastewater and the generation amount of sludge (scum) by a simple process to enable stable treatment of the wastewater while suppressing the generation of foam and scum.SOLUTION: An oil- and fat-containing wastewater treatment method includes: a first treatment step of subjecting oil and fat contained in oil- and fat-containing wastewater to at least one of decomposition, emulsification, and dispersion by at least one of anaerobic bacteria, facultative anaerobic bacteria, microaerophilic bacteria, and aerobic bacteria in an anaerobic environment or microaerophilic environment to discharge first treated water; a second treatment step of subjecting the first treated water to aerobic treatment to discharge second treated water; a third treatment step of subjecting the second treated water to precipitation treatment to discharge third treated water and third treated sludge; and an addiction treatment step of adding a metal salt in the second treatment step.SELECTED DRAWING: Figure 1 |
