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Method for detecting compaction degree of screen in flat plate reverse osmosis or nano-filtration membrane equipment

A flat plate reverse osmosis and detection method technology, applied in the detection field, can solve problems such as uneven distribution of fluid flow, accelerated membrane fouling, failure to retrieve the separation net, etc., and achieve the effect of simple and convenient detection procedures

Inactive Publication Date: 2009-09-30
浙江凯锐环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through the retrieval of relevant technical literature and experimental operations, it is found that if the partition of the flat membrane is not compressed, it will affect the turbulent dispersion of the inlet partition, resulting in uneven distribution of fluid flow and aggravating the phenomenon of concentration polarization. Accelerate the occurrence of membrane fouling at the contact point between the membrane and the water separator (Spiral wound modules and spaces: Review and analysis, Journal of Membrane Science 242 (2004) 129-135), affecting the stability and quality of the product water quality, reducing the membrane (Influence of spacer thickness on permeate flux in spiral-wound seawater reverse osmosis systems, Desalination 146(2002)225-230)
In addition, the consequences of whether the spacer is compressed or not will affect the accuracy of the results of the membrane separation test.
[0004] In the flat membrane equipment, the relevant literature and patents on how to detect whether the partition is compressed have not yet been retrieved

Method used

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  • Method for detecting compaction degree of screen in flat plate reverse osmosis or nano-filtration membrane equipment
  • Method for detecting compaction degree of screen in flat plate reverse osmosis or nano-filtration membrane equipment
  • Method for detecting compaction degree of screen in flat plate reverse osmosis or nano-filtration membrane equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, turn on the flat-panel reverse osmosis membrane equipment, and use one layer of water inlet screen, one layer of TW30-1812 flat reverse osmosis membrane and three layers of water production screen. Then the whole flat reverse osmosis membrane equipment is assembled. Subsequently, inject 20L of tap water filtered by activated carbon into the raw water tank, adjust the concentrated water valve in the reverse osmosis membrane system pipeline, the bypass valve and the cooling water flow in the heat exchanger, so that the system is at a temperature of 25 ° C and a pressure of Run for two hours under the conditions of 10bar and concentrate flow rate of 50L / h, record the conductance k of the influent water feed and product water conductance k perm , it can be concluded that the desalination rate of the reverse osmosis membrane is 83.4%. Then, reduce the system pressure to ≤2 bar, close the water production valve, open the suction line valve, turn off the diaphragm pum...

Embodiment 2

[0036] In this embodiment, the production water separation net is increased to five layers, and the entire flat reverse osmosis membrane equipment is fully assembled. Inject 20L of activated carbon-filtered tap water into the raw water tank, adjust the concentrated water valve, bypass valve and cooling water flow in the heat exchanger in the reverse osmosis membrane system pipeline, so that the system is at a temperature of 25°C and a pressure of 10bar. Run for two hours under the condition that the concentrate flow rate is 50L / h, record the conductance k of the influent water feed and product water conductance k perm , At this time, the desalination rate of the reverse osmosis membrane is 84.6%. Then, reduce the system pressure to ≤2 bar, close the water production valve, open the suction line valve, turn off the diaphragm pump, and record the liquid level drop of the measuring cylinder in the suction line within 20 seconds. At this time, the suction water volume is 17ml. T...

Embodiment 3

[0039]In the present embodiment, increase the water separation screen to seven layers. Inject 20L of activated carbon-filtered tap water into the raw water tank, adjust the concentrated water valve, bypass valve and cooling water flow in the heat exchanger in the reverse osmosis membrane system pipeline, so that the system is at a temperature of 25°C and a pressure of 10bar. Run for two hours under the condition that the concentrate flow rate is 50L / h, record the conductance k of the influent water feed and product water conductance k perm , At this time, the desalination rate of the reverse osmosis membrane is 88.3%. Then, reduce the system pressure to ≤2 bar, close the water production valve, open the suction line valve, turn off the diaphragm pump, and record the drop in the liquid level of the measuring cylinder in the suction line within 20 seconds. At this time, the suction water volume is 12ml. The result is as figure 2 and image 3 shown.

[0040] This example sh...

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Abstract

The invention relates to a method for detecting the compaction degree of a screen in a flat plate reverse osmosis or nano-filtration membrane equipment. The method comprises the following steps: assembling an entering water screen, a flat plate reverse osmosis or nano-filtration membrane sheet, and certain number of generated water screens or entering and generated water mixed screens; adopting tap water without active chlorine as entering water, and operating for certain period of time in a mode of complete cycle so that a reverse osmosis system is operated; after parameters of the generated water are stable, reducing the pressure of the system, closing a generated water valve, opening a resorption pipeline valve, and then turning off a high-pressure pump; and using the pressure difference between a measuring cylinder in a resorption pipeline and an inner membrane of flat plate equipment in the process of stopping the pump to detect the liquid level descending of the measuring cylinder so as to judge whether the screen in the flat plate membrane equipment is compacted tightly, wherein greater amplitude of the liquid level shows that the membrane screen is not compacted tightly, and no descending of the liquid level shows that the screen is compacted tightly.

Description

technical field [0001] The invention relates to a detection method in the technical field, in particular to a detection method for the degree of compression of a partition in a flat-panel reverse osmosis or nanofiltration membrane device. Background technique [0002] Reverse osmosis membrane water treatment technology has outstanding advantages such as operation at room temperature, low energy consumption, compact equipment structure, economical operating costs, and stable product water quality. It has become the most economical seawater and brackish water desalination technology, and is widely used in ultrapure water Preparation, desalination and purification of high-pressure boiler water in power plants, industrial wastewater treatment, food and beverage processing, and concentration, separation and purification processes in various chemical fields. Similarly, nanofiltration membranes are also widely used in water treatment, pharmaceuticals and other fields. [0003] Fla...

Claims

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Application Information

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IPC IPC(8): G01F23/02C02F1/44
Inventor 杨庆峰李亚娟
Owner 浙江凯锐环保股份有限公司
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