Membrane element, device and water processing method using the membrane element

A technology of membrane elements and water treatment devices, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, electrochemical water/sewage treatment, etc., can solve the problems of increasing waste water and reducing fouling, and achieve increased Effects of service life, improved recovery rate, and high desalination rate

Active Publication Date: 2014-10-15
A O SMITH (CHINA) ENVIRONMENTAL PRODUCTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding antiscalants while reducing scaling also led to an increase in wastewater

Method used

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  • Membrane element, device and water processing method using the membrane element
  • Membrane element, device and water processing method using the membrane element
  • Membrane element, device and water processing method using the membrane element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The 1810-75G-ss side flow ( figure 1 Membrane element structure shown) Seven 10cm-long 0.5mm-diameter iridium oxide-coated titanium wires are added to the inlet grid of the reverse osmosis membrane element as electrodes, and seven 5cm-long 0.5mm-diameter iridium oxide-coated titanium wires are added to the pure water guide cloth. Iridium-coated titanium wire is used as an electrode, where A is the length of the short side of the pure water electrode arrangement area, which is 5cm, and B is the distance from the electrode wire closest to the wastewater outlet to the wastewater outlet, which is 5cm, to prepare a new type of electrochemical self-cleaning The coiled membrane element of the pure water end is connected to the negative pole of the DC power supply, and the electrode wire of the water inlet end is connected to the positive pole of the DC power supply. The membrane element is cleaned by backwashing with pure water before shutdown. Specifically, the water producti...

Embodiment 2

[0059] In 1810-75G ( figure 2 Membrane element structure shown) Seven 10cm-long 0.5mm-diameter iridium oxide-coated titanium wires are added to the inlet grid of the reverse osmosis membrane element as electrodes, and seven 10cm-long 0.5mm-diameter iridium oxide-coated titanium wires are added to the pure water guide cloth. Iridium-coated titanium wire is used as an electrode, where A is the length of the short side of the pure water electrode arrangement area, which is 10cm, and B is the distance from the electrode wire closest to the wastewater outlet to the wastewater outlet, which is 5cm, to prepare a new type of electrochemical self-cleaning The roll-type membrane element of the pure water end is connected to the negative pole of the DC power supply, and the electrode wire of the water inlet end is connected to the positive pole of the DC power supply. The membrane element is cleaned by backwashing with pure water before shutdown. The operation process is divided into 3 ...

Embodiment 3

[0061] Membrane elements were prepared as described in Example 1, and the membrane elements were cleaned with pure water without backflow before shutdown. The operation process was divided into 3 times, and power-on cleaning was performed after each water production operation, and power-on was performed for about 30 minutes each time. , and finally make water until the water is full. With this operation mode, the pH of the pure water in the pressure tank can reach 8.1, and when the pure water passing through the membrane element reaches 4t, the pure water flow rate decay rate has been reduced to 30%. Compared with Example 1, when the pure water flow rate decays to 30%, the amount of passing water is less, and it can be seen that the cleaning effect of pure water backflow is better than that without backflow.

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Abstract

The invention relates to a membrane element, a device and a water processing method using the membrane element. The membrane element comprises a membrane, a water inlet end for allowing water to flow into the membrane, a waste water discharge end for discharging waste water from the membrane, a pure water end for discharging pure water from the membrane, a water inlet end electrode arranged in the inflow water, and a pure water end electrode arranged in the pure water, the pure water end electrode is connected with the cathode of a power supply, the water inlet end electrode is connected with the anode of the power supply, and the distance between the water inlet end electrode region and the water inlet end for allowing the water to flow into the membrane is larger than the distance between the water inlet end electrode region and the waste water discharge end for discharging the waste water from the membrane.

Description

technical field [0001] The invention relates to a novel electrochemical self-cleaning membrane element, a device using the membrane element and a water treatment method, in particular a novel membrane element and device for dissolving inorganic salt scaling and improving the service life of the membrane element. Background technique [0002] Reverse osmosis membrane elements are the core components of membrane water treatment technology, which can remove microorganisms, ions, etc. in water sources to obtain pure water. At present, the existing reverse osmosis membrane elements mainly achieve the purpose of producing pure water through the reverse osmosis membrane under a certain pressure. In the actual process of using reverse osmosis membrane elements to treat tap water, it is found that the produced wastewater has a high concentration and hardness at the outlet end, which makes the membrane elements prone to inorganic salt scaling and reduces the service life of the membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/10B01D63/02B01D63/14B01D63/00B01D61/08B01D61/18B01D65/02C02F1/44C02F1/46C02F9/06
CPCB01D65/02C02F1/44
Inventor 侯贻直
Owner A O SMITH (CHINA) ENVIRONMENTAL PRODUCTS CO LTD
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