US-12623170-B2 - Sorbent coated hollow fiber filtration method using less spent sorbent flushing liquid

Abstract

A liquid purification system includes a raw liquid supply line with a sorbent dispenser connected to an inlet of a filtration cartridge with a precoated layer of sorbent formed and removable by flushing and a purified liquid line connected to a purified liquid output of the filtration cartridge. The system is configured to decant spent sorbent and return most of the flushing liquid to the raw liquid supply line. A flushing liquid and sorbent separation device is connected to a flushing liquid outlet of the filtration cartridge, and a clarified flushing liquid outlet of the flushing liquid and sorbent separation device is connected to the raw liquid supply line. The filtration cartridge is made as a hollow-fiber cartridge.

Inventors

• Joseph L. Shmidt
• EVGENIYA SERGEYEVNA VASIL'YEVA
• Aleksandr Gennadievich Mitilineos
• Evgeniy OREKHOV
• Anastasia Nikolaevna VILKOVA
• Maria Anatol'evna FROLOVA

Assignees

• ELECTROPHOR INC.

Dates

Publication Date

20260512

Application Date

20190307

Priority Date

20180927

Claims (3)

1. 1 . A method of purifying a liquid comprising the steps of: precoating a hollow-fiber filter in a hollow-fiber filter cartridge by: mixing a raw liquid stream which is to be filtered, with a sorbent dispensed from an inline sorbent dispenser ( 2 ), producing a mixed raw liquid/sorbent stream; introducing the mixed raw liquid/sorbent stream into an inlet ( 6 ) of a hollow-fiber filtration cartridge ( 3 ); flowing the introduced, mixed liquid/sorbent stream across the hollow-fibers contained within the hollow-fiber filtration cartridge, causing the sorbent to be removably deposited on exterior surfaces of the hollow fibers, while the raw liquid flows into an interior of the hollow fibers, producing a filtrate and a removable coating of sorbent on the exterior surfaces of the hollow fibers; flowing the filtrate out of a purified liquid outlet ( 7 ) of the hollow fiber cartridge ( 3 ); and terminating the dispensing of sorbent to the raw liquid stream; flowing the raw liquid stream through the inlet ( 6 ) of the hollow-fiber filtration cartridge ( 3 ), through the sorbent-coated hollow fibers, and a filtrate out through the purified liquid outlet ( 7 ); terminating the flow of the raw liquid stream into the inlet ( 6 ); removing spent sorbent from the surface of the fibers by introducing a flushing liquid into the hollow fiber filter cartridge causing a spent sorbent/flushing liquid mixture stream to flow out of the hollow-fiber filtration cartridge ( 3 ) through a flushing liquid outlet ( 8 ); separating most of the flushing liquid from the spent sorbent/flushing liquid mixture stream by introducing the sorbent/flushing liquid mixture stream into a flushing liquid and sorbent separation means ( 5 ) producing a clarified flushing liquid stream and a deliquefied sorbent; mixing the clarified flushing liquid stream with the raw liquid stream at a point upstream of the inline sorbent dispenser ( 2 ); flowing the mixed clarified flushing liquid/raw liquid stream into the inlet ( 6 ) of the hollow-fiber filtration cartridge; and flowing filtrate out through the purified liquid outlet ( 7 ).
2. 2 . The method of purifying a liquid of claim 1 , further comprising the step of: regenerating any deliquefied sorbent that is capable of being regenerated.
3. 3 . The method of purifying a liquid of claim 1 , further comprising the step of: disposing of any deliquefied sorbent that is not capable of being regenerated.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is the National Stage of International Application No. PCT/RU2019/000309, filed Mar. 7, 2019, which claims the benefit of Russian Patent Application No. 2018134399 filed Sep. 27, 2018. TECHNICAL FIELD The invention relates to liquid purification systems, which use filtration cartridge with precoat sorbent layer. Such systems are intended for purification or desalination of water from different sources, also of drinking water, technological solutions, wastewaters, beverages and other liquids of household or industrial. BACKGROUND Liquid purification systems, which use filtration cartridge with precoat sorbent layer and methods of stable purification precoat sorbent layer formation are known from the state of the art. It is known that formation of the sorbent layer on the filtration cartridge helps to extend operating age of cartridge or to increase liquid purification efficiency. At the same time the problem of used sorbent disposal is not solved yet. And that is the main lack of the inventions in the state of the art. For example, liquid purification system of the U.S. Pat. No. 4,973,404 (IC B01D 37/02, priority 5 Sep. 1989, Aurian Corporation), chosen as the closest analogue, is known from the state of the art. System contains raw liquid supply line with sorbent dispenser and a pump, connected to the input of the purification cartridge. Purified liquid line is connected to the purified liquid output of the cartridge and drainage line is connected to the drainage output of the cartridge. Liquid purification system of the U.S. Pat. No. 4,973,404 operates in three stages. First stage—precoat sorbent layer in filtration cartridge formation, second—liquid purification, third—filtration cartridge flushing. During the first stage sorbent suspension is pored into the dispenser, maximum pressure is set in the pump. Suspension flows into the purification cartridge, where precoat layer is formed. On the second stage raw liquid is supplied through the raw liquid supply line to the input of the pump. Through the pump raw liquid is directed into purification cartridge, where precoat sorbent layer is already formed. There liquid purification takes place. Purified liquid goes to the consumer or into the storage vessel. Drainage liquid flows out of the system through drainage line, as there is no recirculation in the system. On the third stage the pump is switched to the flushing mode and purified liquid flows into the purification cartridge. The liquid flow flushes used sorbent layer into the drainage through drainage line. The drawback of the system is that it is not effective in the ratio between used raw liquid and resulting purified liquid. Liquid loss occurs when drainage liquid is drawn out from the system during liquid purification stage and because purified liquid is used to flush the cartridge and after the flushing it is drawn into drainage too. Therefore, it is impossible to use the flushing liquid as well as the sorbent itself. In addition, the system cannot be used in the regions where wastewater disposal is totally forbidden, as the system cannot work without this stage. SUMMARY Object of the invention and the technical result achieved when using the invention is development of the new liquid purification system, increase of the raw liquid utilization rate at the decrease of the potential impact on the environment. Problem to be solved and technical result are achieved by that a liquid purification system, comprising a raw liquid supply line with a sorbent dispenser connected to an inlet of a filtration cartridge with a precoated layer of sorbent formed and removable by flushing, a purified liquid line connected to a purified liquid output of the filtration cartridge, characterized in that the system is configured to decant spent sorbent and return most of the flushing liquid to the raw liquid supply line, wherein a flushing liquid and sorbent separation means is connected to a flushing liquid outlet of the filtration cartridge, and a clarified flushing liquid outlet of the flushing liquid and sorbent separation means is connected to the raw liquid supply line, and wherein the filtration cartridge is made as a hollow-fiber cartridge, and in that the sorbent is a regenerable or a non-regenerable sorbent, or a mixture of regenerable and non-regenerable sorbents. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows liquid purification system. FIG. 2 shows an example flushing liquid and sorbent separation means. DETAILED DESCRIPTION Liquid purification system includes raw liquid supply line (1) with sorbent dispenser (2); filtration cartridge (3) connected to the system, purified liquid line (4) is connected to purified liquid outlet of the cartridge. Flushing liquid and sorbent separation means (5) and raw liquid supply line (1) are connected to inlet of filtration cartridge (3) the outlet of which is connected to raw liquid supply line (1). Flushing liquid and