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A device and method for predicting reverse osmosis membrane fouling

A reverse osmosis membrane and time technology, applied in the field of reverse osmosis systems, can solve the problems of water quality decline, restricting the stable operation of reverse osmosis process, membrane flux decline, etc., achieving high accuracy, good prediction effect, and excellent fitting. high degree of effect

Active Publication Date: 2022-04-15
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In theory, the reverse osmosis membrane can intercept most of the pollutants in the water, so as to ensure good water quality. However, some of the intercepted pollutants will adhere to the surface of the reverse osmosis membrane, resulting in a decrease in membrane flux and a decline in the quality of the produced water. It is the core problem that limits the stable operation of the reverse osmosis process

Method used

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  • A device and method for predicting reverse osmosis membrane fouling
  • A device and method for predicting reverse osmosis membrane fouling
  • A device and method for predicting reverse osmosis membrane fouling

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A device that predicts reverse osmosis membrane blocked, such as figure 1 Indicated.

[0047] The device includes a reverse osmosis flat film unit 5 and an inlet tank 2, a water tank 7, a water tube, a water pipe, and a water pipe and a reverse osmotic flat film unit 5, respectively, and is mounted in the inner side of the water tank 2 The temperature monitor 1 of the inlet temperature is monitored in real time. The water pump 3 and pressure Table 4 are mounted on the water pipe. The water supply valve is mounted on the concentrated water pipe 6, and the water tank 8 is provided with electronic balance for real-time recording quality. 9; the apparatus further includes a computer 10, and the computer 10 is connected to the temperature monitor 1, the pressure table 4, the concentrated water valve 6, and the electronic balance 9.

[0048] When the test is started, the test water is placed in the inlet tank 2, and the temperature of the water is monitored in real time with the ...

Embodiment 2

[0073] A method of predicting the blizing of reverse osmosis membrane, including the following steps:

[0074] S1: Control the water flux j after the correction of the reverse osmosis membrane is unchanged, determine the operating pressure ΔP of water samples in the initial time. 0 , And operating pressure ΔP at T, calculate the standardization pressure of T

[0075] S2: Calculate standardization pressure Time change rate at different times;

[0076] S3: Standardization pressure to Time Fitting with film blocked models, the specific process is:

[0077] If standardized pressure When the time change rate increases with the filter time T, the following model is used, and its expression is as follows:

[0078]

[0079] Where T is filtered time; ΔP is the operation pressure of T, ΔP 0 The operating pressure of the initial moment, For standardization pressure; J is a quantity of quantities; Δπ N It is an osmotic pressure whose initial operating pressure is standardized; α is the...

Embodiment 3

[0100] The model one is used for fitting the laboratory and the actual operating RO system standardized pressure - time change data, the fit results figure 2 As shown, the model is used to simulate the operation pressure of the RO system of a actual renewable water plant. The water plant uses a microfiltration-reverse osmosis (MF-RO) double membrane process to purify the secondary water of the urban sewage treatment plant to produce industrial regeneration water and supplement drinking water sources, according to the formula 1-3, calculate the system The water flux in which the osmotic RO film correction is 17LMH, and the flux j in the computer is provided in the computer 17LMH.

[0101] The fitting process is: Enter standardized pressure to ORIGIN 2018 (ΔP / ΔP) 0 ) - Time data and expression of model one. Origin 2018 is fitted to the pressure-time curve with the least squares method. After multiple iterations, the fitting curve and the model parameter value are obtained, that is...

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Abstract

The invention discloses a device and method for predicting reverse osmosis membrane fouling, including: controlling the corrected water production flux J of the reverse osmosis membrane to remain unchanged, and measuring the operating pressure ΔP of the water sample at the initial moment 0 , and the operating pressure ΔP at time t, calculate the normalized pressure at time t to calculate the time change rate of the standardized pressure at different times; use the membrane fouling model to fit the normalized pressure at time t, the specific process is: if the time of normalized pressure When the rate of change increases with the increase of filtration time t, model 1 is adopted: where, t is the filtration time; ΔP is the operating pressure at time t, ΔP 0 is the operating pressure at the initial moment, and is the normalized pressure; j is the dimensionless flux; Δπ N is the osmotic pressure standardized by the initial operating pressure; α is the compensation coefficient; k is the resistance increase coefficient; b is the model parameter related to the initial resistance of filtration. The invention can accurately simulate and predict the change of the standardized pressure with the running time, and has a high fitting degree.

Description

Technical field [0001] The present invention relates to the field of reverse osmosis systems, and more particularly to devices and methods for predicting reverse osmosis membrane. Background technique [0002] The reverse osmosis (RO) process is a high-standard industrial pure water production due to a small water quality, small area, stable operation. The reverse osmosis membrane can be trapped in the water, thereby ensuring good water quality, but partially trapped contaminants are attached to the reverse osmosis membrane surface, causing the membrane flux to decrease, water quality decreased water quality, this It is a core problem that limits the stable operation of reverse osmosis process. In the actual engineering operation, in order to ensure stable water content, the operation mode of constant flux variable pressure is usually used. After the film is blocked, it is necessary to improve the operation pressure to ensure stability of water. Therefore, the change in operating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/10
CPCB01D65/10
Inventor 巫寅虎胡洪营徐雨晴蒋玉明崔勇
Owner TSINGHUA UNIV
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