Method using separation membranes to treat a fluid containing matter in suspension and in solution
First Claim
1. A method of treating a fluid containing matter in suspension and/or in solution by using separation membranes, in which method a feed additive for adsorption and/or filtration purposes is added to the fluid to be treated, and a backwash additive for the purpose of improving backwashing is added to a membrane backwash fluid, comprising the steps ofchoosing a backwash additive that is capable of being neutralized by the feed additive,collecting in a tank as a discharged backwash solution the backwash fluid which contains the backwash additive and has washed-away unused feed additive,allowing the discharged backwash solution sufficient contact time in said tank to enable neutralization to take place in said discharged backwash solution, andseparating the resulting product into a residual product that is concentrated in solid matter and a fluid that is recycled and added to the fluid to be treated.
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Abstract
A method of treating a fluid containing matter in suspension and/or in solution by using separation membranes, in which method a "feed" additive for adsorption and/or filtration purposes is added to the fluid to be treated, and a "backwash" additive for the purpose of improving backwashing is added to the membrane backwash fluid, wherein a backwash additive is chosen that is capable of being neutralized by the feed additive, the backwash fluid which contains the backwash additive and which has washed away unused feed additive is collected as a backwash discharge, the backwash discharge is allowed sufficient contact time to enable neutralization to take place in said discharge, and the resulting product is separated into a residual product that is concentrated in solid matter and a fluid that is recycled to the inlet of the installation.
110 Citations
4 Claims
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1. A method of treating a fluid containing matter in suspension and/or in solution by using separation membranes, in which method a feed additive for adsorption and/or filtration purposes is added to the fluid to be treated, and a backwash additive for the purpose of improving backwashing is added to a membrane backwash fluid, comprising the steps of
choosing a backwash additive that is capable of being neutralized by the feed additive, collecting in a tank as a discharged backwash solution the backwash fluid which contains the backwash additive and has washed-away unused feed additive, allowing the discharged backwash solution sufficient contact time in said tank to enable neutralization to take place in said discharged backwash solution, and separating the resulting product into a residual product that is concentrated in solid matter and a fluid that is recycled and added to the fluid to be treated.
Specification