Method of operating reverse osmosis membrane module
A technology of a reverse osmosis membrane module and an operation method, which is applied to the operation field of the reverse osmosis membrane module, can solve the problems of unpredictable water volume recovery and low cleaning effect, and achieves excellent cleaning effect and sufficient water volume recovery effect.
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no. 1 Embodiment approach
[0033] like figure 1 As shown, the reverse osmosis membrane device 1 to which the operating method of the reverse osmosis membrane module of the present embodiment can be applied is provided with: a raw water tank 2 for storing raw water as water to be treated, and a reverse osmosis unit for separating raw water from the raw water tank 2 The membrane module 3 , the backwash water tank 4 that stores a part of permeated water of the reverse osmosis membrane module 3 , and the chemical tank 5 that stores chemicals added to the backwash water tank 4 .
[0034] The raw water tank 2 is connected to the reverse osmosis membrane module 3 via the first pump P1 and the raw water supply pipe 61 , and the raw water supply pipe 61 is provided with a first on-off valve 71 . In addition, the turbidity and TOC concentration of the raw water stored in the raw water tank 2 are not particularly limited. As the influent of the reverse osmosis membrane module 3, in particular, even relatively high...
no. 2 Embodiment approach
[0054] A second embodiment of the present invention will be described below based on the drawings.
[0055] Such as figure 2 As shown, the reverse osmosis membrane device 10 to which the operating method of the reverse osmosis membrane module of the second embodiment can be applied includes: a raw water tank 12 for storing raw water as water to be treated; A membrane module 13 and a chemical tank 15 for storing chemicals.
[0056] The raw water tank 12 is connected to the reverse osmosis membrane module 13 via the first pump P11 and the raw water supply pipe 161 , and the raw water supply pipe 161 is provided with a first on-off valve 171 .
[0057] A concentrated water discharge pipe 162 for discharging concentrated water and a permeate water discharge pipe 163 for discharging permeated water are connected to the reverse osmosis membrane module 13, and the concentrated water discharge pipe 162 and the permeated water discharge pipe 163 are respectively provided with The se...
Embodiment approach
[0072] In the above-mentioned first embodiment or second embodiment, oxidizing agents, bactericides, etc. are stored in the chemical tanks 5 and 15, and after adding these chemicals to the backwash water (permeate water or raw water), the backwash Water is passed into the concentrated water discharge side of the reverse osmosis membrane module 3,13 through the backwash water supply pipeline 65,164, but it is not limited to this, and sodium hydroxide, hydrogen, etc. can also be stored in the chemical tank 5,15 Potassium oxide, sulfuric acid, hydrochloric acid and other pH regulators are added to the backwash water.
[0073] These pH regulators are added to the backwash water, the pH of the backwash water is adjusted to 10 or more or 3 or less, preferably 10.5 to 12.5 or 1 to 2, and the pH adjusted backwash water is circulated to the reverse osmosis membrane module 3 , 13 of the concentrated water discharge side can be. Thereby, impurities and the like accumulated on the surfac...
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Abstract
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