Unlock instant, AI-driven research and patent intelligence for your innovation.

Semi-permeable membrane element washing apparatus

A cleaning device and membrane element technology, which is applied in the direction of semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., can solve problems such as poor cleaning effect, high cleaning damage rate of RO membrane elements, and difficult water inlet pressure. Good cleaning effect, simple structure, easy to disassemble and assemble

Inactive Publication Date: 2016-05-25
TORAY ADVANCED MATERIALS RES LAB CHINA
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this cleaning method, water is fed from the water production end, and the cleaning water pump is used to feed water alone, and the water inlet pressure is difficult to control. Therefore, the existing reverse cleaning method has a high cleaning damage rate to the RO membrane element; The pollutants peeled off from the membrane surface cannot fall off the membrane surface in time, and when the positive pressure is applied again, the stripped pollutants will be re-compressed to the membrane surface, and the cleaning effect is not good.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Semi-permeable membrane element washing apparatus
  • Semi-permeable membrane element washing apparatus
  • Semi-permeable membrane element washing apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] The following specific examples are given to illustrate the present invention, but the present invention is not limited by these examples.

[0047] The test method used in embodiment and comparative example is as follows:

[0048] The mensuration of pH adopts the portable pH meter (model: HACHSension2) of American Hach Company;

[0049] The determination of conductivity / TDS adopts the portable conductivity meter (model: HACHHQ14d) of American Hach Company.

[0050] Membrane element performance calculation method:

[0051] Desalination rate=[(influent TDS+concentrated water TDS) / 2-product water TDS] / [(influent TDS+concentrated water TDS) / 2]×100%

[0052] Recovery rate = produced water volume / influent water volume x 100%

Embodiment 1

[0057] Both Example 1 and Comparative Example 1 used RO membrane elements in the same project for cleaning.

[0058] This project uses groundwater a as the raw water. The system process is groundwater→multi-media filter→ultrafiltration→precision filter→reverse osmosis. The model of RO membrane element is Toray TM720-400. Membrane elements are cleaned every 2-3 months. During the operation of the reverse osmosis system, it was found that the desalination rate decreased and the water production decreased. In the experiment, 11 RO membrane elements parallel to the rear of the second-stage pressure vessel in this project were used for cleaning. The numbers of the RO membrane elements are 1#~11#, and the diaphragm material of the RO membrane elements is polyamide.

[0059]

[0060] use figure 1 The RO membrane element cleaning device cleans the 8 RO membrane elements at the end of the second stage in the system (the numbers are 1#~8# respectively). When cleaning, first open the...

Embodiment 2

[0084] Both Example 2 and Comparative Example 2 use reverse osmosis membrane elements in the same project for cleaning.

[0085] The project uses the effluent b of a sewage treatment system in a factory area as raw water. The system process is effluent from the sewage treatment system → filter cloth filter → self-cleaning filter → ultrafiltration → precision filter → reverse osmosis. The RO membrane element model is Toray TML20- 400 type, the reverse osmosis system runs for 25 months, and the RO membrane elements are cleaned every 2-3 months. During the operation of the reverse osmosis system, it was found that the desalination rate decreased and the water production decreased. In the experiment, 6 RO membrane elements in parallel at the front of the first section of the pressure vessel in this project were used for cleaning. The numbers of the RO membrane elements are 1#~6# respectively, and the diaphragm material of the RO membrane elements is polyamide.

[0086]

[0087...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Login to View More

Abstract

The present invention relates to a semi-permeable membrane element washing apparatus, which comprises a washing water tank T1, a membrane element standing tank T2, a washing liquid adding system and a washing liquid reflux system, wherein the membrane element standing tank T2 contains a washing liquid. According to the present invention, when the seriously-polluted RO membrane element or NF membrane element EL is subjected to reverse washing by using the semi-permeable membrane element washing apparatus, the reverse washing condition is controlled, and the damage rate of the membrane element during the washing process is reduced; the washing liquid enters from the membrane element water production pipe, and the seriously-polluted scaled substance can be loosened through the reverse washing so as to obtain the good washing effect; and the membrane element in the washing apparatus is directly connected to the washing pipeline and no membrane housing exists, such that the structure is simple, and the assembly and the disassembly are easy.

Description

technical field [0001] The invention relates to the technical field of membrane water treatment, in particular to a cleaning device for a semipermeable membrane element. Background technique [0002] Reverse osmosis membrane and nanofiltration membrane water treatment technologies are more and more widely used in water treatment fields such as electric power, hydraulic power, pharmaceutical industry, and food. However, due to the complexity of influent water quality and insufficient pretreatment, reverse osmosis (RO) Membrane elements or nanofiltration (NF) membrane elements may be contaminated by impurities such as inorganic matter, organic matter, microorganisms, particles, and colloids in the feed water. These substances are deposited on the membrane surface, which will cause the performance degradation of RO membrane and NF membrane, such as low permeate flow rate, high solute permeability, and increased pressure difference between raw water and concentrated water. In o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D65/02
Inventor 王丽华杨瑜芳
Owner TORAY ADVANCED MATERIALS RES LAB CHINA