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Filter media

A filter medium and filter technology, which is applied in the fields of filtration and separation, adsorption water/sewage treatment, chemical instruments and methods, etc., and can solve problems such as inability to guarantee

Inactive Publication Date: 2007-03-21
UNILEVER NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The above prior art cannot guarantee to maintain the desired high flow rate of water under gravity flow conditions for a long period of time, while continuously removing the desired pollutants.
[0015] Therefore, it has been a challenge to provide gravity-fed filters that will have effective flow rates while having desired filtration performance and acceptable adsorption kinetics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] By taking 100 grams of PAC (from Active Carbon company in India) and 30 grams of MFR is about 0, bulk density is 0.22g / cm 3 Carbon blocks were prepared from ultra-high molecular weight polyethylene (from Asahi, Japan). 6.5 wt% of the particles in the PAC passed through the 200 mesh screen and 98% of the particles passed through the 50 mesh screen. The powders were mixed in a screw mixer for 30 minutes and then transferred to molds. Then, the mold was vibrated on a vibrator for 5 minutes, after which it was subjected to 10kg / cm 2 hydraulic pressure. Thereafter, the mold was heated to 260°C for 150 minutes and then cooled.

Embodiment 2 and 3

[0130] Test water was prepared containing 15 mg / liter fine Arizona test dust and additionally contained 0.47 ppm dissolved aluminum cations and 0.4 ppm dissolved iron cations. This test water is filtered through the water filter (embodiment 2) of Figure-1 and the water filter (embodiment 3) of Figure-2, and the pressure head is constant at 160mm. The flow rates obtained during the duration of use of the filters are summarized in Table-3. Satisfactory filtered water quality was obtained with both water filters.

[0131] Total volume of water passed, liters

[0132] The data in Table-3 shows that a high output flow rate of filtered water was obtained using the water filter (Fig.-1) comprising the carbon block filter media of the present invention. Increased water flow rate was obtained using a water filter comprising granular sorbent particles and carbon blocks according to a preferred aspect of the present invention (Fig.-2).

Embodiment 4 and 5

[0134] A further highly contaminated fatigue test water was prepared containing 130 mg per liter of fine Arizona test dust, in addition to 4.7 ppm dissolved aluminum cations and 4 ppm dissolved iron cations. This test water is filtered through the water filter (embodiment 2) of Figure-1 and the water filter (embodiment 3) of Figure-2, and the pressure head is constant at 160mm. The flow rates obtained during the duration of use of the filters are summarized in Table-4. Satisfactory filtered water quality was obtained with both water filters.

[0135] Total volume of water passed, liters

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Abstract

The invention concerns carbon block filter media for use in gravity fed filters comprising powder activated carbon (PAC) having a particle size distribution such that 95 wt% of the particles pass through 50 mesh and not more than 13 % passes through 200 mesh, and a binder material having a Melt Flow Rate (MFR) of less than 5 g / 10 min. The invention also provides water filters and a process for the preparation of a carbon block filter medium. The invention finally provides a process for the purification of water whereby the water under the influence of gravity is passed first through a washable or replaceable sediment filter for removing fine dust and other particulates above 3 m and thereafter through a carbon block filter medium comprising PAC and binder material.

Description

technical field [0001] The present invention relates to carbon block filter media for use in gravity-fed filtration units for filtering particulate contaminants from liquids, including microorganisms such as cysts, bacteria and viruses, and for removing chemical contaminants while maintaining a high flow rate. Background technique [0002] Fluids such as liquids or gases often contain contaminants including particulate matter, chemicals and biological organisms. In liquids, such as water, especially drinking water, it is desirable to remove harmful contaminants prior to consumption in order to maintain thorough hygiene and safety conditions for the maintenance of good health. [0003] Several different methods are known for filtering water, and various devices and devices have been devised and are commercially available. These methods and apparatus vary according to whether they are for industrial or domestic use. [0004] Water treatment for domestic use is basically aim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20C02F1/28
Inventor S·G·班索德D·拉维库马J·查特杰V·N·G·库马
Owner UNILEVER NV
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