Method for cleaning membrane module
A washing method and membrane module technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as higher chemical costs, lower water recovery rate, oxidant retention in pipelines, etc., to achieve inhibition of water recovery rate, suppression reduction, and the effect of preventing stagnation
Inactive Publication Date: 2014-01-01
TORAY IND INC
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Problems solved by technology
However, in these washing methods, there is unreacted oxidant remaining in the filtered side pipeline of the membrane module after the washing process, which needs to be fully washed with membrane filtered water, or carried out with reducing agents such as sodium thiosulfate or sodium bisulfite. Reduction and neutralization, there is a problem of lower water recovery rate and higher chemical cost
Method used
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Embodiment 1
[0071] In the MF / UF membrane module 5, one polyvinylidene fluoride hollow fiber UF membrane manufactured by Toray Co., Ltd. with a molecular weight cut-off of 150,000 Da was used, and the membrane area was 72m 2 The pressurized type assembly (HFU-2020), ready for figure 1 The water making device shown. In this device, the raw water supply valve 4 and the filter water valve 7 are opened, and the raw water supply pump 2 is operated, and the raw water with a turbidity of 5 degrees and a TOC (Total Organic Carbon: total organic carbon) concentration of 2 to 10 mg / L is treated with The filtration flux is 3.0m / d for dead-end filtration.
[0072] During dead-end filtration, for MF / UF membrane module 5, after 30 minutes of filtration process, close raw water supply valve 4 and filtered water valve 7, stop raw water supply pump 2, and open backwash valve 10, air valve 13 and The exhaust valve 6 makes the backwash pump 9 work, and performs backwashing and air washing for 1 minute at t...
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Provided is a method for cleaning a membrane module provided with a microfiltration membrane and / or an ultrafiltration membrane, and which is used to membrane-filter untreated water to obtain membrane-filtered water. Therein, in order to effectively clean a membrane module while minimizing drops in water recovery rates and chemical costs, and preventing leakages and retention of post-treatment chemical liquids to the secondary side of the membrane module, a chemical diffusion step is performed, in which chemical-containing water is supplied to the primary side of the membrane module, and the chemical is diffused from the primary side to the secondary side of the membrane module. This is followed by a backwash step in which water is backwashed from the secondary side of to the primary side of the membrane module. During the chemical diffusion step, the implementation time for the chemical diffusion step is controlled on the basis of the concentration of the chemical diffused to the secondary side of the membrane module.
Description
technical field [0001] The present invention relates to a washing method of a membrane module for a water generation device in which membrane filtration is performed on raw water by a membrane module having at least one of a microfiltration membrane and an ultrafiltration membrane to obtain membrane filtered water. Background technique [0002] In recent years, membrane filtration, which uses membranes to separate and remove impurities in raw water and convert it into clear water, has become increasingly popular in water treatment applications such as sewage and waste water treatment. The target substance to be removed by the membrane varies depending on the type of membrane. In the case of microfiltration membrane (MF membrane) or ultrafiltration membrane (UF membrane) (hereinafter, they are collectively referred to as MF / UF membrane), suspension Turbid substances, bacteria, protozoa, colloidal substances, etc. In addition, in the case of a reverse osmosis membrane (RO mem...
Claims
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IPC IPC(8): B01D65/06B01D61/20B01D61/58B01D65/02C02F1/44
CPCB01D65/02C02F1/444B01D2321/10B01D2321/16C02F2303/16B01D61/14B01D2321/167B01D65/06B01D61/20B01D61/10B01D63/00B01D61/58C02F1/44
Inventor 前田智宏谷口雅英
Owner TORAY IND INC