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Cross-flow filtration apparatus with biocidal feed spacer

A technology of cross-flow filtration and feeding, which is applied in the direction of membrane, membrane technology, chemical instruments and methods, etc. It can solve the problems of loss of production capacity, easy fouling of cross-flow filter system, inability to allow backwash to remove solids, etc.

Inactive Publication Date: 2013-10-30
HYDRANENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As such, the helically wound design of the filter cannot allow water or air agitated backwash to scour its surface to remove solids
Such cross-flow filter systems are prone to fouling and loss of productivity due to accumulated material that cannot be removed from the membrane surface

Method used

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  • Cross-flow filtration apparatus with biocidal feed spacer
  • Cross-flow filtration apparatus with biocidal feed spacer
  • Cross-flow filtration apparatus with biocidal feed spacer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Sterile feed gaskets were fabricated by extruding a polypropylene-based resin mixed with about 0.5% by weight triclosan by an extrusion process. A portion of the sterile feed spacer was then excised and placed in a nutrient matrix (ie, an agar plate) inoculated with common bacteria. Feed gaskets manufactured in the same manner as the sterile feed gaskets were manufactured, except that the sterilizing agent triclosan was included, were used as control samples. A portion of the control feed spacer was placed in a nutrient matrix inoculated with common bacteria. Figure 5A Bacterial growth on control feed pads after 2 and 5 days is shown. Figure 5B Bacterial growth on sterile feed spacers after 2 and 5 days is shown. Such as Figure 5A and 5B As shown, the growth of bacteria on the sterilized feed pads was significantly less than that on the control feed pads after 2 and 5 days.

Embodiment 2

[0054] The same sterile and control feed spacers as in Example 1 were used in the laboratory flow analysis. Such as Figure 6A and 6B As shown, both feed spacers were connected to a waste water feed stream at a flow rate of 0.5 L / min for one month. Such as Figure 6A and 6B As shown, the bacteria in the sterilized feed gasket ( Figure 6B ) growth was significantly less than that on the control feed gasket ( Figure 6A ) on the growth.

Embodiment 3

[0056] In a water filtration plant known to have a high rate of biofouling, a reverse osmosis filter fabricated as in Example 1 with a 0.8 mm thick sterile feed gasket was evaluated and compared with A conventional reverse osmosis filter with a 0.8mm thick feed gasket was used for comparison. These reverse osmosis filters were placed in the facility's water filtration system for 6 months as the lead element (ie, the first element in a series of elements receiving a flow of feed solution). The two reverse osmosis filters were then evaluated for pressure drop and biofilm formation.

[0057] The reverse osmosis filter with the sterilized feed gasket showed a filter pressure drop of 7.3 psi, while the conventional reverse osmosis filter showed a pressure drop of 11 psi. An increase in filter pressure drop is directly related to an increase in RO filter biofouling. In addition, if Figure 7A and 7B As shown, compared with the traditional reverse osmosis filter ( Figure 7A ) c...

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PUM

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Abstract

A cross-flow filtration apparatus is provided. The cross-flow filter is a spiral wound filter that includes a semi-permeable membrane wrapped around a perforated central tube. The semi-permeable membrane includes a feed spacer and a membrane. The feed spacer is a biocidal feed spacer with a biocidal agent impregnated within the feed spacer to prevent biofouling of the feed spacer and the membrane.

Description

technical field [0001] The present invention generally relates to water filtration devices. In particular, the invention relates to a cross-flow water filtration device comprising a biocidal feed spacer. Background technique [0002] In the field of drinking water production, ie in water treatment applications such as water purification and wastewater treatment, separation membranes are replacing traditional sand filtration and flocculation sedimentation and are used to improve the quality of treated water. Generally speaking, reverse osmosis filtration system is one of the most commonly used separation membrane systems in terms of water treatment and water quality improvement. [0003] While reverse osmosis is an effective means of water treatment, its ability to remove dissolved particles from water comes at a price. Bacteria contained in the influent water are intercepted by the semipermeable membrane of the reverse osmosis system and thus accumulate on the surface of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D63/10B01D65/08
CPCB01D2321/16B01D63/10B01D65/08B01D2313/143B01D63/103B01D63/107B01D65/022B01D2313/08B01D2321/167B01D63/1031
Inventor I·谢尔比C·R·巴特尔斯
Owner HYDRANENG
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