Method of sterilizing reverse osmosis water treatment units专利检索-柠檬醛香精香料专利检索查询-专利查询网

Method of sterilizing reverse osmosis water treatment units

阅读：653发布：2024-01-30

专利汇可以提供Method of sterilizing reverse osmosis water treatment units专利检索，专利查询，专利分析的服务。并且The semi-permeable membrane of a reverse osmosis water treatment unit is treated during periods of ''''down time'''' with a solution having a pH preferably in the range of 4.5 and 6.0 and tending both to sterilize the membrane as well as to retard bacterial and fungal growth thereon. The method comprises: passing an aqueous solution of the desired pH and containing formaldehyde and an acid selected from the group consisting of acetic, formic, citric, fumaric and boric, into the water treatment unit and through the membrane thereof and maintaining said aqueous solution in the unit and in contact with the membrane during extended periods of unit ''''down time'''' to both sterilize the unit and extend the life of its membrane.，下面是Method of sterilizing reverse osmosis water treatment units专利的具体信息内容。

权利要求

1. A METHOD OF TREATING A SEMI-PERMEABLE MEMBRANE IN A REVERSE OSMOSIS UNIT HAVING AN ACTIVATED PERIOD AND A DOWNTIME PERIOD TO STERILIZE SAID MEMBRANE AND EXTEND ITS USEFUL LIFE, WHICH COMPRISES: IMMERSING SAID MEMBRANE IN AN AQUEOUS SOLUTION HAVING A PH IN THE RANGE OF 4.5 TO 6, SAID SOLUTION COMPRISING A MIXTURE OF WATER, ACETIC ACID AND A BACTERIAL FUNGAL GROWTH INHIBITOR COMPATIBLE WITH SAID ACID; AND MAINTAINING SAID SOLUTION IN CONTACT WITH SAID MEMBRANE FOR AT LEAST A PORTION OF SAID DOWN-TIME PERIOD OF THE REVERSE OSMOSIS UNIT.

2. A method according to claim 1, wherein said bacterial and fungal growth inhibitor is formaldehyde.

3. A method according to claim 2, wherein said aqueous solution contains acid in an amount between about 6 and 14 grains per gallon of solution and between about 0.5 and about 2.0 percent by weight of formaldehyde.

4. A method according to claim 1, wherein the pH of said aqueous solution is between about 5.0 and about 5.5.

5. A method according to claim 1, wherein said aqueous solution is maintained in said unit and in contact with said membrane for a period of between about 2 and about 5 hours.

6. A method of treating a semi-permeable membrane in a reverse osmosis unit having an activated period and a down-time period to sterilize said membrane and extend its useful life, which comprises: immersing said membrane in an aqueous solution having a pH in the range of 4.5 to 6, said solution comprising a mixture of water, acetic acid in the amount of about 10 grains per gallon of solution and a bacterial and fungal growth inhibitor compatible with said acid; and maintaining said solution in contact with said membrane for at least a portion of said down-time period of the reverse osmosis unit.

7. A method of treating a semi-permeable membrane in a reverse osmosis unit having an activated period and a down-time period to sterilize said membrane and extend its useful life, which comprises: immersing said membrane in an aqueous solution having a pH in the range of 4.5 to 6, said solution comprising a mixture of water, acetic acid in the amount of about 10 grains per gallon of solution and about 1 percent by weight of formaldehyde; and maintaining said solution in contact with said membrane for at least a portion of said down-time period of the reverse osmosis unit.

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Method of sterilizing reverse osmosis water treatment units

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