초록

Process for the control of bacterial growth in polyamide reverse osmosis membranes by treatment with iodide, hydrogen peroxide, or hydrogen peroxide derivatives.

대표청구항 ▼

In the process for continuously purifying a liquid process stream by passing it through at least one reverse osmosis module comprising a core member having a semipermeable polyamide membrane positioned in a manner whereby the liquid permeates through the membrane producing flows of permeate and conc

In the process for continuously purifying a liquid process stream by passing it through at least one reverse osmosis module comprising a core member having a semipermeable polyamide membrane positioned in a manner whereby the liquid permeates through the membrane producing flows of permeate and concentrate, the improvement which comprises inhibiting the growth of microorganisms in said liquid process stream and on the membrane by repeatedly introducing into the process stream prior to its entering the reverse osmosis module about from 5 to 25 parts per million, based on the total volume of the process stream, of an uncombined additive selected from the group consisting of iodine, hydrogen peroxide, sodium persulfate, ammonium persulfate and sodium perborate for a period of about from 30 minutes to 3 hours per 72 hours of operation, without interruption of the process stream.