Patent ID: 7575684

Claim:
A waste water treatment apparatus, comprising: a raw water tank for receiving waste water containing aminoethanol; a denitrification tank for receiving treatment water from the raw water tank; a reaeration tank for receiving treatment water from the denitrification tank and having a semi-anaerobic section; a contact oxidation tank for receiving treatment water from the reaeration tank and having a mineral source containing calcium; a settling tank for receiving treatment water from the contact oxidation tank; an air-lift pump for circulating treatment water from the reaeration tank to the denitrification tank; a mineral mixing tank for receiving biologically treated water and/or sludge generated by biological treatment and mineral sludge containing calcium from the settling tank and for mixing the treated water and the mineral sludge; and a return section for returning the sludge and the treated water from the mineral mixing tank to the raw water tank.