Composite membrane element suitable for water different in quality and manufacturing method

A manufacturing method and composite membrane technology, which is applied in the field of water treatment, can solve the problems of low desalination rate of single nanofiltration membrane, scaling of boiling water, and low flux, so as to reduce the tendency of inorganic scaling, change flow conditions, and stabilize production The effect of water quality

Pending Publication Date: 2020-03-17
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of narrow application range of current membrane elements, small flux of a single reverse osmosis membrane, easy fouling on the concentrated water side of the membrane, short service life, low desalination rate of a single nanofiltration membrane, and fouling of boiling water. Composite membrane elements and production methods suitable for different water qualities, reduce the tendency of inorganic fouling on the concentrated water side of reverse osmosis membranes, effectively improve the life and flux of composite water purification membrane elements, stabilize the water quality of produced water, and boil water without scaling

Method used

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  • Composite membrane element suitable for water different in quality and manufacturing method
  • Composite membrane element suitable for water different in quality and manufacturing method
  • Composite membrane element suitable for water different in quality and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Taking the water quality of a certain city in Yunnan as the influent water, the total solid salt content (TDS) of the influent water is 94.3mg / L, the water pressure is 0.2-0.6MPa, and the recovery rate is 60%. After the tap water is filtered through PP cotton and activated carbon filter elements, it enters the composite membrane Element, the membrane area ratio of the reverse osmosis membrane and the nanofiltration membrane in the composite membrane element is 1. The TDS of produced water under different pressures is shown in the table below, and the TDS of produced water falls between 30-90mg / L to ensure healthy drinking water.

[0039] Table 3. The quality of the water produced by the water purification filter with the influent TDS less than 100mg / L

[0040]

Embodiment 2

[0042] The water quality of a district in Beijing (TDS is 290.2mg / L) and a city in Fujian (TDS is 160.8mg / L) are respectively used as influent water, the water pressure is 0.2-0.6MPa, the recovery rate is 60%, and the tap water is filtered through PP cotton and activated carbon filter elements Finally, it enters the composite membrane element, and the membrane area ratio of the reverse osmosis membrane and the nanofiltration membrane in the composite membrane element is 2. The TDS of produced water under different pressures is shown in the table below. The TDS of produced water falls between 30-90mg / L, and a certain amount of calcium, magnesium, potassium and other beneficial minerals are retained, making drinking water healthy.

[0043] Table 4. The quality of water produced by the water purification filter with an influent TDS of 100-300mg / L

[0044]

[0045]

Embodiment 3

[0047] The water source of a city in Shanxi (TDS is 480.7mg / L) and a city in Anhui (TDS is 350.2mg / L) is used as influent water, the water pressure is 0.2-0.6MPa, the recovery rate is 60%, and the tap water is filtered through PP cotton and activated carbon filter element , into the composite membrane element, the membrane area ratio of reverse osmosis membrane and nanofiltration membrane in the composite membrane element is ratio 3. The TDS of produced water under different pressures is shown in the table below. The TDS of produced water falls between 30-90mg / L, and a certain amount of calcium, magnesium, potassium and other beneficial minerals are retained, making drinking water healthy.

[0048] Table 5. Water quality produced by nanofiltration / reverse osmosis composite water purification filter element with influent TDS of 300-500mg / L

[0049]

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Abstract

The invention discloses a composite membrane element suitable for water different in quality and a manufacturing method. The element includes a central tube, a reverse osmosis membrane assembly and ananofiltration membrane assembly. The reverse osmosis membrane assembly includes a reverse osmosis membrane, a dense water flow path cloth of the reverse osmosis membrane assembly and a pure water flow path cloth. The nanofiltration membrane assembly includes a nanofiltration membrane, a dense water flow path cloth of the nanofiltration membrane assembly and a pure water flow path cloth. This composite membrane element has a wide range of application, ensures healthy water drinking and no scaling, and has a high flux, the rejection rate of calcium and magnesium ions is higher than that of a single nanofiltration membrane, and the service lifetime of the composite membrane element is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a composite membrane element suitable for different water qualities and a manufacturing method. Background technique [0002] With the improvement of my country's economy and living standards, people's requirements for drinking water quality are getting higher and higher, and the application of water purifiers in households is becoming more and more common. TDS (Total dissolved solids) is one of the important indicators to detect the water quality of the water purifier. Affected by geographical location, the TDS of tap water in the northern and southern regions is quite different. The TDS distribution of tap water quality in China according to Bolebao map statistics is shown in Table 1. The TDS range of tap water in the country is very broad, ranging from less than 100mg / L to more than 500mg / L. For water bodies with TDS lower than 100mg / L, the current A single nanofiltr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/58B01D63/00
CPCB01D61/58B01D63/00C02F1/441C02F1/442Y02A20/131
Inventor 陈亦力唐东利彭文娟魏乾乾卞玲玲莫恒亮孟佳意
Owner BEIJING ORIGIN WATER FILM TECH
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