WASTE WATER TREATMENT APPARATUS PROVIDED WITH SOLID-LIQUID SEPARATION UNIT

PROBLEM TO BE SOLVED: To provide a membrane-separation active sludge tank and a membrane-separation flocculation sedimentation tank including a unit of pouring cleaning water onto the surface of a separation membrane and an ultrasonic oscillator capable of irradiating the surface of the separation membrane with ultrasonic waves.SOLUTION: A membrane-separation waste water treatment apparatus includes an ultrasonic oscillator 31 and an aeration mechanism 21 and cleans the surface of a separation membrane 11 through air lift action during aeration. Since deposit accumulated on the surface of the separation membrane stops aeration, the deposit is removed by pouring cleaning water onto the surface of the separation membrane, removing bubbles remaining on the surface of the separation membrane and irradiating with ultrasonic waves. Cleaning water is jetted from an aeration part by switching an aeration part of the aeration tube 21 from the air source to the cleaning water source. The ultrasonic oscillator may be oscillated at a fixed position or with movement. The separation membrane consists of a PET film having through holes in the entire surface superimposed, on both sides, with PTFE films which have a thickness of 0.1-0.3 mm and through holes of a diameter of 0.01-0.5 μm on the entire surface. 【課題】本発明は、分離膜表面に洗浄水を流す装置と、分離膜表面に超音波を照射できる超音波発振器を備えた膜分離活性汚泥槽や、膜分離凝集沈澱槽を提供する。【解決手段】超音波発振器３１と、散気機構２１を備えた膜分離式廃水処理装置であり、散気中はエアリフト作用で分離膜１１表面を洗浄する。また、分離膜表面に蓄積する付着物は散気を停止させ、分離膜表面に洗浄水を流し、分離膜表面に残留する気泡を除去し、超音波を照射して除去する。このとき、洗浄水は散気管２１の散気部をエア源から洗浄水源に切換えて散気部より噴出させる。超音波発振器は固定位置で発振させても、移動させながら発振させてもよい。前記分離膜は全面に貫通孔を有するＰＥＴフィルムと前記ＰＥＴフィルムの両側に厚さ０．１〜０．３ｍｍ、直径０．０１〜０．５μｍの貫通孔を全面に有するＰＴＦＥフィルムを重ねて、構成されている。【選択図】図４