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A method for controlling organic fouling of reverse osmosis membrane

A technology of reverse osmosis membrane and control method, which is applied in the direction of semipermeable membrane separation, water treatment parameter control, chemical instruments and methods, etc., and can solve the problems of lack of research on component removal and no combination use

Active Publication Date: 2020-10-30
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Common pretreatment processes include: coagulation sedimentation, activated carbon filtration, microfiltration / ultrafiltration, etc. Among them, coagulation sedimentation and activated carbon processes are widely used because of their low cost and simple operation, but these pretreatment processes are usually separate There is no precedent for combined use of different pretreatment processes. The research on the removal of organic matter components in influent water is very lacking, and there is no specific method for combined use. How to design a combined pretreatment process to further slow down RO The fouling rate of the system is of great significance in controlling the organic fouling of the RO membrane, etc.

Method used

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  • A method for controlling organic fouling of reverse osmosis membrane
  • A method for controlling organic fouling of reverse osmosis membrane
  • A method for controlling organic fouling of reverse osmosis membrane

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preparation example Construction

[0046] The preparation and storage methods of clean activated carbon are as follows: use coconut shell granular activated carbon with a particle size of 1-2mm. Clean activated carbon was prepared; the cleaned activated carbon was dried in an oven at 70°C, and then placed in a beaker and sealed away from light.

[0047] The present invention firstly determines the dosing ratio of activated carbon and ferric chloride by measuring the molecular weight of organic matter in the water sample and the measurement results of the three-dimensional fluorescence spectrum; determines the dosing concentration range of activated carbon and ferric chloride according to the concentration of DOC, and respectively The corresponding DOC removal rate is obtained, and the optimal activated carbon dosage A and the optimal ferric chloride dosage B are determined by the minimum dosage value required for stable removal of DOC, and activated carbon is added to the reverse osmosis influent to make it The...

Embodiment 1

[0051] In this embodiment, the target feedwater 1 is adopted, and the determination of the organic fouling control method in the reverse osmosis membrane feedwater 1 is as follows:

[0052] (1) prepare two kinds of water treatment agents of ferric chloride stock solution and clean gac;

[0053] (2) Determine the optimal dosage concentration A of activated carbon and the optimal dosage concentration B of ferric chloride:

[0054] (21) Take out the influent water sample 1 from the target influent water 1 of the reverse osmosis membrane, and use a liquid chromatograph to measure the molecular weight of the organic matter in the reverse osmosis influent water sample 1, and its molecular weight distribution diagram is as follows figure 2 As shown, use a fluorescence spectrophotometer to measure and obtain the three-dimensional fluorescence spectrum of the reverse osmosis membrane influent water sample 1, as shown in image 3 shown by figure 2 It can be seen that the influent wa...

Embodiment 2

[0072] In this embodiment, the target influent 2 is selected, and its organic fouling control method is the same as that in Embodiment 1, the difference is that:

[0073](ⅰ) Molecular weight distribution of organic matter in influent water sample 2 is as follows Figure 5 As shown, its three-dimensional fluorescence spectrum is shown in Figure 6 shown by Figure 5 It can be seen that the influent water sample 2 is at 10 3 -10 4 Water samples with obvious absorption peaks in the Da range, and in 10 2 -10 3 For water samples without obvious absorption peaks in the Da range, the Figure 6 It can be seen that the influent water sample 2 has obvious fluorescence response in the IV area and the VI area, thus, it is determined that the optimal concentration ratio of activated carbon and ferric chloride in the influent water sample 2 is 2:1;

[0074] (ii) Take 5ml of the water sample to be tested, pass through a 0.45μm filter membrane, and measure the DOC concentration of the i...

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Abstract

The invention discloses an organic pollution and blocking control method of a reverse osmosis membrane. The method comprises the steps of preliminarily determining a feeding proportion of active carbon and ferric chloride through determination results of molecular weight of organic matter in an influent water sample and a three-dimensional fluorescence spectrogram of the sample, determining feeding concentration intervals of the active carbon and ferric chloride according to a DOC (dissolved organic carbon) concentration, obtaining corresponding DOC removal rates, determining the best active carbon feeding concentration A and the best ferric chloride feeding concentration B by stabilizing a minimum dose required for removing DOC, feeding the active carbon of the concentration A into reverse osmosis influent for absorption for 0.5-1h, and feeding ferric chloride of the concentration B for coagulation to remove the active carbon and the residual organic matter. The method has the characteristics of low cost, low energy consumption, simplicity in operation and the like, and achieves the purposes of stabilizing the quality of the RO (reverse osmosis) system influent, reducing a pollution and blocking speed of an RO system, improving operating stability of the RO system, and prolonging operating time of the RO system, thereby lowering operating cost of the RO system by removing organic pollutants from the RO system influent.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis desalination of regenerated water, in particular to a method for controlling organic fouling of reverse osmosis membranes. 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. 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 fouling of the RO membrane, resulting in a decline in the water production and water quality of the RO system. The increase in operating energy consumption and cost limits the promotion of the RO process. [0003] Most urban domestic sewage recycling p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/08
CPCB01D65/08B01D2321/16C02F1/283C02F1/441C02F1/5245C02F9/00C02F2209/21C02F2303/14
Inventor 胡洪营巫寅虎白苑方品晟
Owner TSINGHUA UNIV
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