Method of manufacturing for fire retardant board

The present invention relates to a micro-air diffuser for maximizing dissolution efficiency of dissolved oxygen in an aeration tank, i.e., an essential condition in biological wastewater treatment. The micro-air diffuser of the present invention is characterized in that: an air inlet (2) of an air pipe connecting unit (13) installed in a central part of a main body (1) is connected to a compressor in an upper part of the aeration tank; the micro-air diffuser is installed on the bottom of the aeration tank by connecting the compressor of the aeration tank to an air supply pipe (2-1) connected to a lower portion of the air pipe connecting unit (13); air is flown in the micro-air diffuser through the air supply pipe (2-1), and air of high pressure is ejected to a microbubble outlet (11) at a high speed through a nozzle; the air is discharged to the upper side through a plurality of pressure tank outlets (3-1) which are installed in a circular shape on the top portion of an air pressure tank (3) and spaced apart from one another at predetermined intervals; after allowing a discharge pipe lower part (5) to mix wastewater with gas supplied by forming a vacuum pressure around the pressure tank outlets (3-1), thereby compressing the air to a pressure higher than a surrounding low pressure fluid, a mixture of the gas and wastewater is supplied to a first protrusion embedded discharge unit (6), a second protrusion embedded discharge unit (7) and a third rotary protrusion nozzle (8); and the microbubbles are ejected from a microbubble outlet nozzle by generating a vortex in first and second discharge pipe intermediate parts (10, 9) installed among the first protrusion embedded discharge unit (6), second protrusion embedded discharge unit (7) and third rotary protrusion nozzle (8), thereby generating microbubbles from the mixture of the gas and wastewater. 본 발명은 포기조 상부의 콤퓨레샤)와 본체(1)의 중앙부에 설치된 공기관접속부(13)의 공기주입구(2)와 연결되며, 공기관접속부(13)의 하부에 연결된 공기공급관(2-1)에 연결되여 포기조 바닥에 설치되며, 상기 공기공급관(2-1)을 통하여 공기를 마이크로 산기장치 내부로 유입하며 강한 압력의 공기가 노즐을 통해 미세기포배출구(11)로 고속으로 분출 될 때, 공기압력탱크(3)의 상부에 원형으로 일정간격 이격되어 설치된 다수개의 압력탱크배출구(3-1)를 통해 상부로 배출시, 압력탱크배출구(3-1)의 주변에 진공압이 형성되어 주변 저압의 유체를 보다 높은 압력으로 압축하여 공급되는 기체와 폐수는 배출관하부(5)에서 혼합하여 1차 돌기내장배출부(6), 2차 돌기내장배출부(7), 3차 돌기내장배출부(8)이 구비되며, 상기 1차 돌기내장배출부(6), 2차 돌기내장배출부(7), 3차 회전 돌기노즐(8) 사이에 설치된 제2, 제1배출관중간부(8, 9)에서 와류를 발생시켜 기체와 폐수를 마이크로 기포를 발생하여 미세기포출구노즐로 분출시키는 미이크로 산기장치.