METHOD AND APPARATUS FOR ANAEROBIC TREATMENT OF KRAFT PULP WASTEWATER

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for stably and efficiently performing anaerobic treatment of kraft pulp wastewater to obtain excellent treated water.SOLUTION: The method and apparatus for stably and efficiently performing anaerobic treatment of kraft pulp wastewater include an oil-water separation step of separating kraft pulp wastewater into separated sludge containing oil and fat, and separated liquid; a methane fermentation step of performing methane fermentation treatment of the separated sludge separated in the oil-water separation process; and an anaerobic treatment step of performing anaerobic treatment of treated water in the methane fermentation process and the separated liquid. It is preferable to mix a part of the treated water in the anaerobic treatment with the separated sludge to perform methane fermentation treatment in the methane fermentation process.