Computer-readable recording medium on which clogging location specification program for separation membrane module is recorded, water production system, and water production method
US-2019184343-A1 · Jun 20, 2019 · US
Method and program for determining cleaning trouble in fresh water generator
US12569813B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12569813-B2 |
| Application number | US-202117915204-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 26, 2021 |
| Priority date | Mar 30, 2020 |
| Publication date | Mar 10, 2026 |
| Grant date | Mar 10, 2026 |
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Abstract
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The present invention provides a fresh water generator operating method and a determination program that are employed in a method for cleaning a separation membrane module following membrane filtration, and that, while various cleaning steps such as reverse pressure cleaning, air cleaning, chemical solution cleaning are taking place after completion of the membrane filtration, determines cleaning troubles by calculating a temporal change in resistance increase rate on the basis of an increase in membrane differential pressure.
First claim
Opening claim text (preview).
The invention claimed is: 1 . A method for determining cleaning trouble in a fresh water generator, the method comprising: a filtration step of filtering water to be treated by a separation membrane to obtain treated water; a first cleaning step of cleaning the separation membrane at the end of the filtration step; and a second cleaning step of chemically cleaning the separation membrane with a chemical solution having a concentration of 50 mg/L to 10,000 mg/L performed following performance of the filtration step and/or the first cleaning step a plurality of times, wherein when a temporal change A in a resistance increase rate between performance of the first cleaning step a plurality of times which is calculated based on a resistance increase rate during performance of the filtration step a plurality of times is larger than a reference value, insufficiency or trouble in the first cleaning step is determined, and when a temporal change B in a resistance increase rate between performance of the second cleaning step a plurality of times is larger than a reference value, insufficiency or trouble in the second cleaning step is determined, wherein the temporal change A in the resistance increase rate is calculated by a slope of a regression line obtained by a least square method or by the following Equation (1) and the temporal change B in the resistance increase rate is calculated by a slope of a regression line obtained by a least square method or by the following Equation (2): [ Equation 1 ] Δ ( Δ R filt_cycle Δ t filt_cycle ) Δ t filt_ 1 st = temporal change A in resistance increase rate ( 1 ) ΔR filt_cycle : resistance increase during filtration step Δt filt_cycle : time of filtration step Δt filt_1st : total filtration time between first cleaning steps [ Equation 2 ] Δ ( Δ R after 2 nd_filt _cycle Δ t filt_cycle ) Δ t filt_ 2 nd = temporal change B in resistance increase rate ( 2 ) ΔR after2nd_filt_cycle : resistance increase during filtration step immediately after second cleaning step Δt filt_2nd : total filtration time between second cleaning steps. 2 . The method for determining cleaning trouble in a fresh water generator according to claim 1 , wherein change amounts or change rates of the temporal change A in the resistance increase rate and the temporal change B in the resistance increase rate from a reference value are compared, insufficiency or a trouble in the first cleaning step is determined when an increase of the temporal change A in the resistance increase rate is larger, and insufficiency or a trouble in the second cleaning step is determined when an increase of the temporal change B in the resistance increase rate is larger. 3 . The method for determining cleaning trouble in a fresh water generator according to claim 1 , wherein in determination of the cleaning trouble in the second cleaning step, the cleaning trouble in the second cleaning step is determined by combinin
Assignees
Inventors
Classifications
Regeneration of sorbents, filters · CPC title
Time · CPC title
by dialysis, osmosis or reverse osmosis {(general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268)} · CPC title
Automatic control of cleaning processes · CPC title
Use of chemical agents · CPC title
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- What does patent US12569813B2 cover?
- The present invention provides a fresh water generator operating method and a determination program that are employed in a method for cleaning a separation membrane module following membrane filtration, and that, while various cleaning steps such as reverse pressure cleaning, air cleaning, chemical solution cleaning are taking place after completion of the membrane filtration, determines cleani…
- Who is the assignee on this patent?
- Toray Industries
- What technology area does this patent fall under?
- Primary CPC classification B01D65/02. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 10 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).