Nitrate nitrogen denitrifying treatment material, method of producing the same, and method of removing nitrate nitrogen

摘要

The present invention relates to a relatively strong granular or massive denitrifying treatment material, which can be subjected to continuous granulation, is suitable for growth of bacteria and difficult for separation of bacteria, is superior in denitrifying ability, and is used for denitrifying nitrate nitrogen in waste water by biological treatment by meansofsulfur-oxidizing bacteria. The denitrifying treatment material contains 30 to 70 parts by weight of a metal carbonate powder such as limestone and 30 to 70 parts by weight of a sulfur powder. The denitrifying treatment material is produced by mixing 0.1 to 30 parts by weight of a water insoluble or hardly-soluble organic binder with respect to 100 parts by weight of total of the metal carbonate powder and the sulfur powder, and by integrating these powders. To make a denitrifying treatment material having a bulk specific gravity of 0.2 to 0.7, a fibrous or microporous substance can be mixed. The denitrifying treatment material having a small bulk specific gravity is available for a denitrifying treatment in which the treatment material is fluidized or suspended in water.