Apparatus and method for treating wastewater containing nitrogen-containing dyes
AssigneeKuraray Co., Ltd.
InventorsTadao Shiotani, Yuko Takami, Seiichi Nakahara
Life of this patent
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Abstract
A wastewater treatment apparatus comprises a nitrogen-containing dye containing wastewater inlet connected to an obligatory anaerobic tank to bring wastewater containing a nitrogen-containing dye into contact with sulfate-reducing bacteria under obligatory anaerobic conditions, a nitrification tank to bring the wastewater into contact with nitrifying bacteria under aerobic conditions, and a denitrification tank to bring the wastewater into contact with the denitrifying bacteria under anaerobic conditions.
Claims14
A wastewater treatment apparatus, comprising:
- a source of a nitrogen-containing dye containing wastewater,
- an inlet connected to an obligatory anaerobic tank to bring said wastewater containing a nitrogen-containing dye into contact with sulfate-reducing bacteria in said anaerobic tank under obligatory anaerobic conditions,
- a nitrification tank to bring the wastewater into contact with nitrifying bacteria in said nitrification tank under aerobic conditions, and
- a denitrification tank to bring the wastewater into contact with the denitrifying bacteria in said denitrification tank under anaerobic conditions.
A wastewater treatment apparatus, comprising:
- a source of a nitrogen-containing dye containing wastewater,
- an inlet connected to a denitrification tank to bring said wastewater containing a nitrogen-containing dye into contact with sulfate-reducing bacteria and denitrifying bacteria in said denitrification tank under obligatory anaerobic conditions and a nitrification tank to bring the wastewater into contact with nitrifying bacteria in said nitrifying tank under aerobic conditions are disposed in the order of mention, whereby a portion of the treated water discharged from the nitrification tank is returned and circulated to the denitrification tank.
A method of treating wastewater containing a nitrogen-containing dye, which comprise the following steps (1) to (3):
- (1) contacting a wastewater containing a nitrogen-containing dye with sulfate reducing bacteria under obligatory anaerobic conditions;
- (2) contacting a wastewater with nitrifying bacteria under aerobic conditions;
- and
- (3) contacting a wastewater with denitrifying bacteria under anaerobic conditions.
Dependencies are inferred from the claim text.