Patent ID: 8173419

Claim:
Equipment for treating wastewater by anaerobic ammonium oxidation, the wastewater treatment equipment comprising: an anaerobic ammonium oxidation vessel containing an anaerobic ammonium oxidizing bacteria to receive water to be treated containing ammonium and nitrite and to denitrify ammonium and nitrite in the water by the anaerobic ammonium oxidizing bacteria, forming denitrified water; an acclimatization vessel downstream from the anaerobic ammonium oxidation vessel to receive the denitrified water from the anaerobic ammonium oxidation vessel, wherein the denitrified water received in the acclimatization vessel includes anaerobic ammonium oxidizing bacteria, the acclimatization vessel containing an immobilizing material that collects the anaerobic ammonium oxidizing bacteria in the denitrified water as immobilized microorganisms attached to the immobilizing material, wherein the acclimatization vessel has a structure such that the immobilizing material is prevented from flowing out of the acclimatization vessel; and a pipe connecting the acclimatization vessel to the anaerobic ammonium oxidation vessel.