Method of water disposal

Abstract

A biological method of water disposal that avoids disadvantages caused by an increase of the number of membrane filter units attributed to an increase of the volume of sludge disposed of, maintaining a given rate of sludge disposed of. Four or more membrane filter units (5) are immersed and laid at given intervals in series in aeration tank (4). The amount of suctioned filtrate water of each membrane filter unit (5) and / or the amount of air emitted toward each membrane filter unit (5) is sequentially increased from the raw water inflow side to the sludge discharge side. Accordingly, in response to the amount of solid matter adhering to the membrane surface of membrane filter units (5) on the sludge recovery side, the solid matter can be unfailingly detached from the membrane surface. Simultaneously, the sludge concentration at edge portions of the recovery side exhibiting the highest sludge concentration would be increased, thereby facilitating the discarding operation of recovered sludge and further realizing reduction of drying energy at discarding. Moreover, the discharge of filtrate water can be efficiently carried out.

Description

technical field [0001] The present invention relates to a water treatment method for biochemically treating organic matter and its debris contained in industrial waste water and domestic waste water, or raw water containing microorganisms and bacteria, and separating water and sludge with a membrane. Background technique [0002] According to the conventional activated sludge treatment method, waste water (raw water) from which large solids have been removed by a microporous filter is introduced into a raw water adjustment tank. In this raw water adjustment tank, the liquid level is measured by a liquid level gauge, and the first liquid delivery pump is intermittently driven to adjust the liquid level height in the tank to within a prescribed range. After the raw water transported by the first liquid delivery pump is introduced into the anaerobic tank, the raw water overflowing from the anaerobic tank flows into the adjacent aeration tank. A membrane filtration unit is subm...

AI Technical Summary

Problems solved by technology

Therefore, the upward flow generated by the micro-bubbles released from the auxiliary deflation generating device interferes with the downward flow of the swirling flow, disturbing the flow of the swirling flow, and may produce a stagnant area where no flow occurs. In addition to the insufficient amount of dissolved oxygen caused by the difference in sludge concentration in the direction, the amount of dissolved oxygen is also insufficient due to the installation of the auxiliary gas release generator, resulting in the inability to perform equal and effective sludge treatment.

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