Method for cleaning membrane module
一种洗涤方法、膜组件的技术，应用在化学仪器和方法、膜技术、半透膜分离等方向，能够解决化学药品成本变高、管道氧化剂滞留、水回收率降低等问题，达到抑制水回收率、抑制降低、防止滞留的效果
Inactive Publication Date: 2015-06-03
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, a polyvinylidene fluoride hollow fiber UF membrane with a molecular weight cut-off of 150,000 Da, manufactured by Toray Co., Ltd., and a membrane area of 72 m was used. 2 The pressurized unit (HFU-2020), ready figure 1 The water generator shown. In this device, the raw water supply valve 4 and the filtered water valve 7 are opened, 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 The filtration flux is 3.0m / d for dead-end filtration.
[0072] During the dead-end filtration, for the MF / UF membrane module 5, after the filtration process for 30 minutes, close the raw water supply valve 4 and the filtered water valve 7, stop the raw water supply pump 2, and open the backwash valve 10, air valve 13 and The exhaust valve 6 operates the backwash pump 9, and the backwashing and air washing are simultaneously performed f...
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Abstract
In the washing method of membrane modules having at least one of microfiltration membranes and ultrafiltration membranes, which obtain membrane-filtered water by performing membrane filtration on raw water, in order to suppress the reduction of water recovery rate and the cost of chemicals, and prevent the The liquid leaks and stays to the filtered side of the membrane module, thereby effectively washing the membrane module, supplying the liquid containing the drug to the supply side of the above-mentioned membrane module, and diffusing the drug solution from the supply side of the above-mentioned membrane module to the filtered side After the chemical solution diffusion process, a backwash process in which the membrane filtered water is backwashed from the filtered side to the supply side of the above-mentioned membrane module is carried out, and in the above-mentioned chemical solution diffusion process, based on the filtered side of the above-mentioned membrane module The concentration of the diffused chemical solution is used to control the implementation time of the chemical solution diffusion process.
Description
technical field [0001] The present invention relates to a method for washing a membrane module of a water generation device in which membrane filtration water is obtained by membrane filtration of raw water using a membrane module having at least one of a microfiltration membrane and an ultrafiltration membrane. Background technique [0002] In recent years, in water treatment applications such as sewage treatment and wastewater treatment, membrane filtration methods in which impurities in raw water are separated and removed by membranes and converted into clear water have been widely used. The target substance to be removed by the membrane varies depending on the type of membrane. In the case of a microfiltration membrane (MF membrane) or an ultrafiltration membrane (UF membrane) (hereinafter, these 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 memb...
Claims
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IPC IPC(8): B01D65/06B01D61/20B01D61/58B01D65/02C02F1/44
CPCB01D61/14B01D2321/10C02F1/444C02F2303/16B01D65/02B01D2321/167B01D65/06B01D61/20B01D61/10B01D63/00B01D61/58C02F1/44
Inventor 前田智宏谷口雅英
Owner TORAY IND INC