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Dynamic evaluation method of scale inhibition performance of reverse osmosis scale inhibitor

A technology of reverse osmosis and scale inhibitor, which is applied in the field of dynamic evaluation of the scale inhibition performance of reverse osmosis scale inhibitor, can solve the problems of large consumption of test water and chemicals, deviation of test results, etc., so as to save test time and reduce measurement error. , the effect of improving work efficiency

Active Publication Date: 2012-06-20
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the once-through method of water supply is the closest to the on-site operating conditions, but the consumption of test water and chemicals is large; the full circulation method is tested at a fixed recovery rate; the partial circulation method and the intermittent circulation method are used to discharge the permeate and return the concentrate to improve The recovery rate of the reverse osmosis system operation, but the discharge of the concentrated solution will change the concentration of the antiscalant in the raw water at the same time, resulting in the deviation of the test results

Method used

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  • Dynamic evaluation method of scale inhibition performance of reverse osmosis scale inhibitor
  • Dynamic evaluation method of scale inhibition performance of reverse osmosis scale inhibitor
  • Dynamic evaluation method of scale inhibition performance of reverse osmosis scale inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for dynamically assessing scale inhibition performance of reverse osmosis scale inhibitors, comprising the following steps:

[0054] ①Establish a reverse osmosis operation system, the dynamic reverse osmosis operation system (such as figure 1 shown) includes raw water tank 1, high-pressure pump 2, activated carbon filter 3, precision filter 4, pressure gauge 5, thermometer 6 and reverse osmosis membrane element 7 connected in series; the port of the reverse osmosis membrane element is divided into two branches One branch is equipped with a concentrated water regulating valve 8, and the concentrated liquid is discharged through the concentrated water regulating valve; the permeate is discharged through the other branch. The membrane elements used are Dow TFC-2012-100 membrane elements (use pressure 0.45MPa, water production rate 16L / h, desalination rate stable at 96%). The balance used has an accuracy of 0.001 g.

[0055] ②Add test water and 1ppm antiscalant ...

Embodiment 2

[0066] The antiscalant ATMP was used to replace HPMA, and other test conditions were referred to in Example 1. The test data recorded during system operation are shown in Table 3.

[0067]

Embodiment 3

[0069] Replace HPMA with antiscalant MDC220, refer to Example 1 for other test conditions, see Table 4 for test data recorded during system operation.

[0070]

[0071] The curves of the recovery rate and n of the three antiscalants HPMA, ATMP and MDC220 are shown in image 3 . Depend on image 3 It can be clearly distinguished that the scale-forming ions of the three antiscalants deviate from the concentration ratio, HPMA deviates the most, and MDC220 deviates the least. From this, it can be judged that the scale inhibition performance of the scale inhibitors is ranked as follows: MDC220>ATMP>HPMA, which is consistent with the conclusion of the static evaluation test. For the static test method, see patents CN201010274469.6 and CN201020620538.X.

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Abstract

The invention relates to a dynamic evaluation method of the scale inhibition performance of a reverse osmosis scale inhibitor, which comprises the following steps: (1) establishing a reverse osmosis operating system, mounting a concentrated water adjusting valve on a reverse osmosis concentrated solution pipe, and adjusting a reverse osmosis system to operate at a certain recovery rate by the concentrated water adjusting valve; (2) adding raw water and a certain dosage of scale inhibitor for test into the system, recording operating pressure and solution temperature of a reverse osmosis membrane, flow rate, or weight, or volume of penetrating solution and the concentrated solution, and concentration of scaling ions in the raw water and the concentrated solution in the operating progress; and (3) calculating concentration ratio according to the flow rate, or the weight, or the volume of the penetrating solution and the concentrated solution, calculating concentration ratio of the scaling ions in the concentrated solution and the raw water, and then evaluating performance of the scale inhibitor by an extreme value error method. The method disclosed by the invention is rapid, accurate, simple in test condition, and easy in operation.

Description

technical field [0001] The invention belongs to the technical field of water treatment in environmental engineering, and specifically relates to a dynamic evaluation method for anti-scale performance of reverse osmosis scale inhibitors, which adopts the one-pass method of feed water, discharges all the permeate and concentrated liquid, and installs on the concentrated water pipeline The concentrated water regulating valve adjusts the recovery rate of the reverse osmosis system operation. During the test, various parameters during the operation of the reverse osmosis system were recorded, and the performance of the antiscalant was evaluated through the changes of the parameters during operation. This test method is suitable for performance evaluation of various reverse osmosis scale inhibitors. Background technique [0002] In recent years, reverse osmosis desalination technology has stood out among many desalination technologies due to its advantages of high efficiency, low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00G01N33/00
Inventor 张小霓吴文龙
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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