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Method for evaluating feed water of reverse osmosis membrane apparatus, and method and apparatus for treating water

A reverse osmosis membrane and evaluation method technology, which is applied in the field of water treatment devices, can solve problems such as the influence of reverse osmosis membrane device operation, the difficulty of detecting non-ionic surfactants, and the difficulty of detecting non-ionic surfactants, and achieve long-term continuous and stable operation Effect

Active Publication Date: 2011-06-15
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the reverse osmosis membrane usually operates at a recovery rate of 75 to 90% (4 times of concentration to 10 times of concentration), if the treated water contains 20 to 50 ppb of the above-mentioned nonionic surfactant, the nonionic surfactant in the concentrated water will When the concentration of active agent exceeds 200ppb, water biofouling will be generated on the concentrated water side of the reverse osmosis membrane, which may also affect the operation of the reverse osmosis membrane device
However, since it is very difficult to detect nonionic surfactants at tens of ppb levels, it is difficult to detect nonionic surfactants at this concentration level when measuring the concentration of treated water.

Method used

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  • Method for evaluating feed water of reverse osmosis membrane apparatus, and method and apparatus for treating water
  • Method for evaluating feed water of reverse osmosis membrane apparatus, and method and apparatus for treating water
  • Method for evaluating feed water of reverse osmosis membrane apparatus, and method and apparatus for treating water

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Experimental program
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Effect test

Embodiment 1

[0065]

[0066] Using biologically treated water discharged from plants A, B, and C, water was passed through a polyamide reverse osmosis membrane ("ES-20 flat sheet" manufactured by Nitto Denko) under the following conditions, and the membrane filtration flux was measured. .

[0067] Water temperature: 25°C

[0068] Operating pressure: 0.5~0.7MPa

[0069] Recovery rate: 75%

[0070] figure 1 The relationship between water passing time and membrane filtration flux is shown in .

[0071]

[0072] A part of the biologically treated water from the above-mentioned factories A, B and C was extracted, and fluorescence analysis was performed under the following conditions.

[0073] Device: Hitachi F-4500 Fluorescence Spectrophotometer

[0074] Photomultiplier tube voltage: 700V

[0075] Slit: 5nm (excitation light and fluorescence)

[0076] Scanning speed: 12000nm / min

[0077] Number 1 in Table 1 means that the excitation wavelength of irradiation and the detected fluoresce...

Embodiment 2

[0120]

[0121] use image 3 The device of the auxiliary system 16 is omitted in the water treatment device, and the water treatment of the water to be treated is performed.

[0122] In addition, as water to be treated, washing water (TOC concentration: 5.5 mg / L, alkyl phenylene ether type nonionic surfactant (APE) concentration: 2.2 mg / Las TOC) discharged from the liquid crystal manufacturing process was used.

[0123] As the fluorescence analyzer 17, model FL4500 manufactured by Hitachi High-Tech Co., Ltd. was used. Moreover, as described later, in addition to the concentrated water from the reverse osmosis membrane device 15, the detection of the water inlet of the reverse osmosis membrane device 15 is also performed using a fluorescence analyzer of the same type.

[0124] First, after adding 10 mg / L of hydrogen peroxide to the water to be treated, the pH of the water to be treated was adjusted to 10.5 with sodium hydroxide.

[0125] This to-be-treated water was introdu...

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Abstract

The present invention provides a method for evaluating reverse osmosis membrane supply water, a method for water treatment and a water treatment device. The invention can evaluate the quality of reverse osmosis membrane supply water in a short time simply and accurately, thereby operating the water treatment device with the reverse osmosis membrane device stably in a long term. The reverse osmosis membrane supply water evaluation method for evaluating the quality of water supplied to the reverse osmosis membrane device is characterized in that the method detects fluorescence intensity of the reverse osmosis membrane supply water and evaluates the water quality based on the fluorescence intensity detection result. The water treatment device with the reverse osmosis membrane device is operated and managed based on the evaluation result.

Description

technical field [0001] The present invention relates to an evaluation method of treated water supplied to a reverse osmosis membrane device, a water treatment method for separating treated water into concentrated water and permeated water by a membrane separation device, and a water treatment device . [0002] In addition, in the present invention, "reverse osmosis membrane" means "reverse osmosis membrane" in a broad sense including "reverse osmosis membrane" and "filtration membrane". Background technique [0003] I. Since the solute rejection rate of the reverse osmosis membrane is high, the permeated water obtained by the reverse osmosis membrane treatment has good water quality, so it can be effectively reused for various purposes. But on the other hand, since the permeation flux of the membrane decreases and the operating pressure increases as the treatment continues, in this case, in order to restore the performance of the membrane, it is necessary to stop the operat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64C02F1/44
CPCY02W10/10
Inventor 益户光和一柳直人
Owner KURITA WATER INDUSTRIES LTD
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