Device for measuring pollution index of filtration membrane

Patent metadata

Field	Value
Publication number	US-9579607-B2
Application number	US-201214371122-A
Country	US
Kind code	B2
Filing date	Nov 20, 2012
Priority date	Jan 9, 2012
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A device for measuring the pollution index of a filtration membrane includes: a raw water supply part; a first filtration membrane; a raw water supply line; a first flow rate measuring part; a first path line; a second path line; a second filtration membrane having a filtration characteristic different from the first filtration membrane; a first path selection valve installed in the first path line in parallel with respect to the second filtration membrane so that a first measuring path from the raw water supply part to the first flow rate measuring part passes through the first filtration membrane and a second measuring path from the raw water supply part to the first flow rate measuring part successively passes through the first and second filtration membranes; and a pollution index measuring part measuring the pollution indexes of the first and second filtration membranes.

First claim

The invention claimed is:

1. A device for measuring the pollution index of a filtration membrane, the device comprising:
a raw water supply part supplying raw water to be measured;
a first filtration membrane;
a raw water supply line connecting the raw water supply part to the first filtration membrane;
a first flow rate measuring part measuring the flow rate;
a first path line connecting the first filtration membrane to the first flow rate measuring part;
a second path line connected to the first path line in parallel;
a second filtration membrane installed in the second path line and having a filtration characteristic different from the first filtration membrane;
a first path selection valve installed in the first path line in parallel with respect to the second filtration membrane so that a first measuring path through which the raw water flows from the raw water supply part to the first flow rate measuring part passes through the first filtration membrane without flowing through the second filtration membrane and a second measuring path through which the raw water flows from the raw water supply part to the first flow rate measuring part successively passes through the first filtration membrane and then the second filtration membrane; and
a pollution index measuring part measuring the pollution indexes of the first filtration membrane and the second filtration membrane on the basis of the flow rate measured by the first flow rate measuring part with respect to the first measuring path and the second measuring path.

2. The device of claim 1 , wherein the pores of the first filtration membrane are larger than the pores of the second filtration membrane.

3. The device of claim 2 , the device comprising:
a first pressure regulator installed on the inlet side of the first filtration membrane of the raw water supply line to regulate the pressure of raw water introduced into the first filtration membrane;
a first bypass line connected to the raw water supply line to bypass the first pressure regulator; and
a first bypass valve installed on the first bypass line, and closed to form the first measuring path and opened to form the second measuring path and the third measuring path.

4. The device of claim 3 , further comprising a second pressure regulator installed on the inlet side of the second filtration membrane of the second path line to regulate the pressure of raw water introduced into the second filtration membrane.

5. The device of claim 3 , wherein the second path line comprises a second inlet path line forming the inlet side of the second filtration membrane and a second outlet path line forming the outlet side of the second filtration membrane, the device further comprises a third path line connected in parallel to the second outlet path line, a third filtration membrane installed on the third path line and having pores smaller than the pores of the second filtration membrane, and a second path selection valve installed on the second path line in parallel to the third filtration membrane to form a third measuring path, while the first path selection valve is in closed position, along which the raw water from the raw water supply part sequentially passes through the first, second, and third filtration membranes and flows to the first flow measuring part, and the pollution index measuring part measures the pollution index of the third filtration membrane on the basis of the flow rate measured by the first flow rate measuring part with respect to the third measuring path.

6. The device of claim 5 , further comprising:
a second pressure regulator installed on the second inlet path line to regulate the pressure of raw water introduced into the second filtration membrane;
a second bypass line connected to the second inlet path line to bypass the second pressure regulator; and
a second bypass valve installed on the second bypass line, and closed to form the first measuring path and the second measuring path and opened to form the third measuring path.

7. The device of claim 6 , further comprising a third pressure regulator installed on the inlet side of the third filtration membrane of the third path line to regulate the pressure of raw water introduced into the third filtration membrane.

8. The device of claim 7 , further comprising:
a first path control valve installed on the inlet side of the first pressure regulator of the raw water supply line so as to be connected in parallel to the first bypass valve, and opened or closed in reverse to the way the first bypass valve is opened or closed;
a second path control valve installed on the inlet side of the second pressure regulator of the second path line so as to be connected in parallel to the second bypass valve, and closed to form the first measuring path and the third measuring path and opened to form the second measuring path; and
a third path control valve installed on the inlet side of the third pressure regulator of the third path line and opened to form the third measuring path.

9. The device of claim 5 , wherein the pollution index measuring part measures the pollution indexes of the first, second, and third filtration membranes with respect to the first, second, and third filtration membranes, respectively, in descending order.

10. The device of claim 5 , wherein the pollution index measuring part measures the pollution indexes of the first, second, and third filtration membranes with respect to the first, second, and third filtration membranes, respectively, in ascending order.

11. The device of claim 2 , further comprising:
a third path line branched from the inlet side of the second filtration membrane of the second path line;
a third filtration membrane installed on the third path line and having pres smaller than the pores of the second filtration membrane;
an auxiliary filtration membrane installed on the inlet side of the third filtration membrane of the third path line and having pores equal in size to the pores of the second filtration membrane; and
a second flow rate measuring part installed on the outlet side of the third filtration membrane of the third path line to form a third measuring path along which the raw water from the raw water supply part sequentially passes through the first, auxiliary, and third filtration membranes and flows to the second flow measuring part,
the second measuring path and the third measuring path are formed simultaneously, and
the pollution index measuring part measures the pollution index of the third filtration membrane on the basis of the flow rate measured by the second flow rate measuring part with respect to the third measuring path.

12. The device of claim 11 , further comprising:
a first pressure regulator installed on the raw water supply line to regulate the pressure of raw water introduced into the first filtration membrane;
a second pressure regulator installed on the inlet side of the second filtration membrane of the second path line to regulate the pressure of raw water introduced into the second filtration membrane; and
a third pressure regulator installed between the auxiliary filtration membrane of the third path line and the third filtration membrane to regulate the pressure of raw water introduced into the third filtration membrane.

13. The device of claim 12 , further comprising:
a first bypass line connected to the raw water supply line to bypass the first pressure regulator; and
a first bypass valve installed on the first bypass line, and closed to form the first measuring path and opened to form the second measuring path and the third measuring path.

14. The device of claim 13 ,

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Hong Seung-Kwan
• Hong Il-Gu
• Ju Young Gil

Classifications

• G01N2015/086

  of films, membranes or pellicules · CPC title

• G01N15/0826

  and measuring fluid flow rate, i.e. permeation rate or pressure change · CPC title

• B01D65/10 Primary

  Testing of membranes or membrane apparatus; Detecting or repairing leaks · CPC title

• C02F2103/08

  Seawater, e.g. for desalination · CPC title

• C02F1/441

  by reverse osmosis · CPC title