Filtration unit

Abstract

A filtration unit (A) is immersed in raw water (W) that is held inside a reservoir tank, and includes a membrane module (5) that filters the introduced raw water (W). This filtration unit (A) includes a casing (3) which is in the shape of a box having a bottom and includes the membrane module (5) housed therein, and an activated carbon cartridge (4) inside which activated carbon is provided in cartridge form. Inside the casing (3) are provided an intake port that is used to introduce the raw water into the interior of the casing, and an opening / closing device that is installed on this intake port and controls a flow of the raw water into the interior of the casing, and the activated carbon cartridge (4) side and the membrane module (5) side are separated so as to allow the raw water (W) introduced into the interior of the casing 3 to circulate from the activated carbon cartridge (4) side to the membrane module (5) side.

Description

technical field [0001] The present invention relates to a filtration unit that is immersed in raw water and includes a membrane module that filters the introduced raw water. [0002] This application claims priority to Japanese Patent Application No. 2005-355781 for which it applied on December 9, 2005, and uses the content here. Background technique [0003] Conventionally, as a water purification treatment device for filtering raw water of rivers, lakes, ponds, etc. to obtain purified water, there is a water purification treatment device disclosed in Patent Document 1, and the like. In the treatment device of this patent document 1, a partition wall is provided to divide the treatment tank into two chambers in the treatment tank for storing raw water, and one chamber is added by adding, in particular, aerobic microorganisms adhered to the surface. Activated carbon such as activated carbon is used as a microbial treatment part for treating raw water, and the other chamber ...

AI Technical Summary

Problems solved by technology

Therefore, the suspended matter adheres to the outer surface of the membrane module or clogs the inner hole of the membrane module when the raw water is filtered by the membrane module, and there is a problem that the filtration efficiency is reduced.

[0008] In addition, in the above-mentioned water purification treatment device, the activated carbon circulated in the microbial treatment part by the air discharged from the aeration device does not flow out into the membrane filter part due to the installation of the baffle plate and its specific gravity is larger than that of the raw water, but is in a floating state. The activated carbon may still flow out into the membrane filter part. When the activated carbon flows out into the membrane filter part, the amount of activated carbon in the microbial treatment part will decrease. Adhering to the outer surface of the membrane module of the filtration membrane unit housed in the membrane filtration unit or clogging the inner pores of the membrane module, resulting in a decrease in filtration efficiency

[0009] Further, in the above-mentioned water purification treatment device, the treatment tank including the microbial treatment part added with activated carbon and the membrane filter part with the filter membrane unit is a water tank, and it is necessary to set up the raw water such as rivers or lakes and the like together with the treatment tank. , a separation tank that temporarily stores the raw water and removes coarse objects, and a water delivery pipe that has a pump and connects the separation tank and the treatment tank. The problem of large tracts of land

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