METHOD FOR PRODUCING MICROORGANISM-IMMOBILIZED CARRIER FOR WATER TREATMENT USE

WIPO Patent Application WO/2021/045104

A1

Provided is a method for producing a microorganism-immobilized carrier for water treatment use, in which it becomes possible to cut a soft polyurethane foam having water swellability and specific pores with high efficiency. A method for producing a microorganism-immobilized carrier for water treatment use which is formed from a soft polyurethane foam, wherein the soft polyurethane foam has an average number of pores of 9 to 30 pores/25 mm when swollen with water and also has a volume swelling ratio, which is expressed as a ratio of the volume upon the swelling with water to the volume in an absolutely dried state, of 110 to 1000%, the method comprising the steps of: expanding a mixed solution comprising a urethane prepolymer, a polyisocyanate compound (a) and water to produce the soft polyurethane foam having a water content of 20% by mass or more; and cutting the soft polyurethane foam while keeping the water content in the soft polyurethane foam at 20% by mass or more.

JPH02307594	CONTACT FILTER AND WASTEWATER PURIFICATION APPARATUS FOR BIOLOGICAL CONTACT AERATION-TYPE WATER TREATMENT EQUIPMENT
JPS5378654	METHOD OF TREATING WATER BY MICRO-ORGANISM

KONDO TOMOYUKI (JP)
HIROKAWA SOICHIRO (JP)

PCT/JP2020/033263

March 11, 2021

September 02, 2020

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NISSHINBO CHEMICAL INC (JP)

C02F3/10; C08G18/00; C08G18/10; C08G101/00

JPH0951794A	1997-02-25
JPH10174990A	1998-06-30
JP2010119979A	2010-06-03

OHTANI PATENT OFFICE (JP)

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