PURPOSE: To reduce remarkably the start up period of a treatment function to effect high level purification of waste water just from the start of waste water treatment and to keep always a high level of an oxidative decomposition function for contaminants in the waste water by using a floating filter medium on which highly concentrated microorganisms are fixed comprehensively in advance.
CONSTITUTION: As microorganisms to be fixed comprehensively on a floating filter medium are used Pseudomonas sp. No. AESO 53 strain (Microorganisms Engineering Institute Fungus No.13230) having a function for decomposing surfactants and Acinetobactor sp. No. SK-0402A strain (Mcroorganisms Engineering Institute Fungus No.13232) having a good function for decomposing oil and fat. As a part of microorganisms to be fixed comprehensively, denitrifying bacteria such as Pseudomonas nitroreducens having a good function for converting nitrogen of nitric acid and nitrous acid types into nitrogen gas are used in such a way that the thickness of a microorganisms layer is 0.15mm or more.
YOSHIDA AYUMI
SUGIMOTO YOSHIKANE
TANAKA RYOJI
ISHIGAKI MECH IND