US 2015/0306544 A1 · SYSTEM FOR CLEANING MEMBRANE, AND METHOD FOR CLEANING MEMBRANE USING SAME

Abstract

A system for cleaning a membrane of the present invention includes: a first membrane filtration tank which includes a membrane and an aerator, filters inflow raw water by membrane filtration, and discharges treated water and water to be treated, respectively; a pressure gauge for measuring a transmembrane pressure and a flow meter for measuring a permeation flux which are provided at a treated water discharge line of the first membrane filtration tank; and a controller which calculates a water permeability recovery rate by calculating the water permeability from the differential pressure measured at the pressure gauge and the permeation flux measured at the flow meter, predicts a membrane contamination degree from the calculated water permeability recovery rate, and controls a back-pulsing interval and an intermittent aeration interval.

Claims9

Dependent claims

A membrane cleaning system comprising:

a first membrane filtration tank provided with a membrane and an aerator and filtering inflow raw water by membrane filtration and discharging treated water and water to be treated respectively;
a pressure gauge configured to measure a transmembrane pressure and a flow meter configured to measure a permeation flux, the pressure gauge and the flow meter being on a treated water discharge line of the first membrane filtration tank;
and
a controller calculating a water permeability based on the transmembrane pressure measured by the pressure gauge and the permeation flux measured by the flow meter to calculate a water permeability recovery rate and predicting a degree of membrane contamination based on the calculated water permeability recovery rate and controlling a back-pulsing interval and an intermittent aeration interval.

1 more element

A method for cleaning a membrane, the method comprising:

measuring a transmembrane pressure and a permeation flux of treated water from a membrane filtration tank to calculate a water permeability;
calculating a water permeability recovery rate based on information of the water permeability;
predicting a degree of membrane contamination based on the water permeability recovery rate through simulation;
if the degree of membrane contamination is less than a first set value, maintaining a current operating condition, whereas if the degree of membrane contamination is greater than or equal to the first set value, comparing the degree of membrane contamination with a second set value;
and
if the degree of membrane contamination is less than the second set value, adjusting a back-pulsing interval to optimize cleaning conditions, whereas if the degree of membrane contamination is greater than or equal to the second set value, adjusting an aeration interval.

3 more elements

Dependencies are inferred from the claim text.

System for cleaning membrane, and method for cleaning membrane using same

Life of this patent

System for cleaning membrane, and method for cleaning membrane using same

Life of this patent

Abstract

Claims9