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Device and method for evaluating inlet water sewage blocking potential of reverse osmosis system

A technology for reverse osmosis and water fouling blocking, applied in the field of reverse osmosis systems, can solve the problems of RO membrane fouling, membrane flux decline, no method and equipment for simulating and predicting the change of running time, etc., and achieves the effect of maintaining stable operation.

Pending Publication Date: 2019-01-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reverse osmosis (RO) process (Reverse Osmosis, RO) is gradually being used in the field of sewage regeneration due to its good water quality and stable operation. However, the organic matter in the sewage will cause serious RO membrane fouling, and the membrane flux will decrease due to RO membrane fouling. , water quality decline, etc. are the main problems that limit the stable operation of the reverse osmosis process for sewage regeneration treatment
Accurately simulating and predicting the change of the membrane flux of the RO membrane with the system running time is of great significance for controlling membrane fouling and maintaining the stable operation of the system, but there is no method for simulating and predicting the change of the RO membrane flux with the system running time and equipment

Method used

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  • Device and method for evaluating inlet water sewage blocking potential of reverse osmosis system
  • Device and method for evaluating inlet water sewage blocking potential of reverse osmosis system
  • Device and method for evaluating inlet water sewage blocking potential of reverse osmosis system

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The method for evaluating the fouling potential of reverse osmosis system inlet water provided by the present invention comprises the following steps:

[0041] (1) Measure the water quality M of the water sample at time t(min) t (g), and calculate the product water flow Q of the water sample at time t t (mL·min -1 );

[0042] (2) Calculate the water passing area S (mm) of the reverse osmosis membrane 2 ), calculate the product water flux j of the reverse osmosis membrane at time t t (mL·min -1 · mm -2 ):

[0043]

[0044] (3) The water flux j tPerform standardized processing to obtain the standardized product water flux j of the reverse osmosis membrane at time t nt ;

[0045] (4) For standardized permeate flux j nt Correct the water sample temperature to obtain the corrected normalized permeate flux J at time t t ;

[0046] (5) The corrected normalized permeate flux J t The membrane fouling model is used for fitting, and the expression of the membrane f...

Embodiment 2

[0067] The device for evaluating the fouling potential of the reverse osmosis system provided by the present invention is evaluated by the evaluation method provided in Example 1, such as figure 1 As shown, the device includes a reverse osmosis flat membrane device 5 and a water inlet tank 2, a concentrated water tank 7 and a water product tank 8 connected to the reverse osmosis flat membrane device 5 through a water inlet pipe 54, a concentrated water pipe 55 and a water production pipe 56 respectively; A temperature monitor 1 for real-time monitoring of the inlet water temperature is installed at the inner bottom of the water tank 2; an inlet pump 3 is installed on the inlet pipe 54, and the inlet pump pumps the inlet water in the inlet tank to the reverse osmosis flat membrane device 5; The bottom of the water tank 8 is provided with an electronic balance 9 for real-time recording of the weight of the produced water.

[0068] Preferably, the water inlet pump 3 is a constant...

Embodiment 3

[0076] When using the evaluation system provided in Example 2, the method of use is as follows:

[0077] (I) Connect the temperature monitor and the electronic balance to the data processing device 10. The data processing device is used to receive and store the influent temperature and product water quality transmitted by the temperature monitor and the electronic balance. Embodiment 1 is preset in the data processing device According to the evaluation method described in the evaluation method, the inlet water temperature and product water quality are processed according to the evaluation method;

[0078] (II) After the evaluation system is installed, first open the concentrated water valve, then start the inlet pump, adjust the concentrated water valve so that the pressure indication is consistent with the operating pressure range during the actual project operation, and turn on the magnetic stirrer at the same time, wait until the pressure indication is stable After that, st...

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Abstract

The invention discloses a device and a method for evaluating the inlet water sewage blocking potential of a reverse osmosis system. The evaluation method comprises the following steps of (1) measuringthe producing water mass Mt of a water sample at the t moment, and calculating out the producing water flow Qt of the water sample at the t moment; (2) calculating the water passing area S of a reverse osmosis membrane, and calculating out the flux Jt of the reverse osmosis membrane at the t moment; (3) carrying out standardization processing on the flux Jt to obtain a standardized flux jnt at the t moment; (4) correcting the standardized flux jnt about the temperature to obtain a corrected standardized flux Jt at the t moment; and (5) fitting the corrected standardized flux Jt by using a membrane sewage blocking model, and calculating out an equilibrium flux JSS and a membrane sewage blocking index sigma of the water sample. The evaluation device and method can accurately simulate and predict the change of the RO membrane flux along with the running time, and has important significance for controlling membrane sewage blocking and maintaining stable operation of the RO system.

Description

technical field [0001] The invention relates to the field of reverse osmosis systems, in particular to a device and method for evaluating the fouling potential of a reverse osmosis system. Background technique [0002] There is a serious shortage of water resources in our country, and the recycling of sewage is an effective way to solve this problem. The comprehensive utilization of recycled water is of great significance to alleviate the shortage of water resources in our country. Reverse Osmosis (RO) technology is gradually being used in the field of sewage regeneration due to its good water quality and stable operation. However, the organic matter in the sewage will cause serious RO membrane fouling, and the membrane flux will decrease due to RO membrane fouling. , the decline in the quality of produced water, etc. are the main problems that limit the stable operation of the reverse osmosis process for sewage regeneration treatment. Accurately simulating and predicting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08B01D63/08B01D61/08B01D65/10
CPCB01D61/08B01D63/08B01D65/10G01N15/08G01N2015/086
Inventor 胡洪营巫寅虎赵雪皓王运宏童心白苑
Owner TSINGHUA UNIV