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Control method of membrane filtration

A control method and membrane filtration technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in fully ensuring the amount of filtered water, deviation of filtration time, etc., to prevent the reduction of filtration efficiency, Reliable backwashing, ensuring the effect of filtering water

Active Publication Date: 2011-10-26
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, in this membrane filtration device, there is a problem that the filtration time varies in each filtration unit
As a result, it is difficult to secure a sufficient amount of filtered water in this membrane filtration device

Method used

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  • Control method of membrane filtration
  • Control method of membrane filtration
  • Control method of membrane filtration

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Embodiment Construction

[0018] Embodiments of the membrane filtration device of the present invention will be described in detail. In the drawings referred to here, figure 1 It is a configuration explanatory diagram of the membrane filtration device of the embodiment.

[0019] Such as figure 1 As shown, the membrane filtration device S1 of this embodiment includes a filtration unit A, a filtration unit B, and a filtration unit C each having two membrane modules 7 . Moreover, the filter pump 2a, the filter pump 2b, and the filter pump 2c are provided in these filter units A, B, and C, respectively. These filtration pumps 2a, 2b, and 2c send the raw water 1 to the membrane modules 7 of the filtration units A, B, and C respectively.

[0020] The filtered water obtained by the membrane modules 7 of the filtration units A, B, and C is stored in the filtered water tank 15 . Further, as the filtration of the raw water 1 proceeds, the fouling substances contained in the raw water 1 are continuously accum...

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Abstract

The present invention provide a film filtering device capable of reliably backflushing, preventing reduction of filtering efficiency and increase of transferring cost of the film filtering device, and capable of steadily and adequately ensuring filtering water volume. The film filtering device (S1) repeats filtering of set time and backflushing of set times in a plurality of film filtering units (A, B, C) for separating dispersant and dispersate, the backflushing of set times execute set on the filtering units (A, B, C) according to degree of the dispersate in the filtering unit (A, B, C) accumulated because of the filtering of set time, the film filtering device (S1) is characterized in when backflushing starting times of the filtering units (A, B, C) overlaps, the backflushing of the filtering units are carried out according to order with fewer backflushing times.

Description

technical field [0001] The invention relates to a membrane filtration device using a membrane module and a control method thereof. Background technique [0002] Filtration using a membrane is a unit operation in which a dispersoid and a dispersant are separated using a membrane made of, for example, resin or ceramics. In general, a membrane filtration device that removes polluting substances from water can adjust the amount of filtered water, and at the same time, can continuously obtain filtered water of approximately the same water quality. On the other hand, when the membrane filtration device performs filtration for a long time, fouling substances accumulate on the surface of the membrane to cause clogging. In addition, the clogging of the membrane causes a reduction in filtration efficiency, an increase in the operating cost of the membrane filtration device, and the like. Therefore, in a membrane filtration device, as is well known, backwashing is performed to preven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02
Inventor 吉田郁子黑泽贤一郎武本刚阴山晃治
Owner HITACHI LTD