Nanofiltration membrane off-line cleaning and repair device

Abstract

The utility model relates to a kind of nanofiltration membrane off-line cleaning repair devices.It includes dispensing device and cleaning device, it is characterized by: the drug device includes acid tank (1), alkali tank (2) and salt tank (3), acid tank (1), alkali tank (2) and salt tank (3) are respectively equipped with water inlet pipe, acid tank (1), alkali tank (2) and salt tank (3) bottom are respectively equipped with first water outlet pipe (4), second water outlet pipe (5) and third water outlet pipe (6), first water outlet pipe (4), second water outlet pipe (5) and third water outlet pipe (6) are respectively equipped with first Y type filter (7), second Y type filter (8) and third Y type filter (9), and first water outlet pipe (4), second water outlet pipe (5) and third water outlet pipe (6) are respectively connected with the inlet of cleaning device.It can be fully cleaned to each nanofiltration membrane, and cleaning effect is greatly improved.

Description

Technical Field

[0001] This utility model relates to a wastewater treatment device, specifically a nanofiltration membrane offline cleaning and repair device. Background Technology

[0002] Nanofiltration membranes possess excellent properties such as thermal stability, acid and alkali resistance, and solvent resistance, playing an invaluable role in the recovery of valuable substances from wastewater and are widely used in the treatment of various organic wastewaters. Examples include pesticide wastewater treatment, whey and antibiotic desalination, metal recovery from electroplating wastewater, and the treatment of various petrochemical wastewaters. The core function of nanofiltration membranes is to achieve water purification and substance concentration through selective separation, primarily used in water treatment, food processing, and pharmaceutical separation. Due to the high concentration of organic matter in RO concentrate and the complex water composition resulting from upstream reagent addition, nanofiltration membrane modules foul quickly, making cleaning difficult. Conventional chemical cleaning methods only perform online forward chemical cleaning of nanofiltration membrane modules. Because nanofiltration units contain a large number of nanofiltration membrane modules (3-7 membranes / membrane housings), and some clogging substances that cannot be decomposed by chemical reagents are pushed deeper into the nanofiltration membrane, causing severe clogging and accumulation, conventional chemical cleaning can only remove some of the fouling, failing to completely remove the fouling from the nanofiltration membrane modules. Over time, the membrane performance will severely degrade. Furthermore, traditional chemical cleaning relies solely on manual valve operation by on-site personnel to control the flow rate and pressure during cleaning, increasing the workload for these staff. Therefore, inventing an offline cleaning and repair device for nanofiltration membranes would be highly beneficial. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an offline cleaning and repair device for nanofiltration membranes, which can thoroughly clean each nanofiltration membrane and greatly improve the cleaning effect.

[0004] The technical solution of this utility model is implemented as follows: it includes a drug preparation device and a cleaning device, characterized in that: the drug preparation device includes an acid tank (1), an alkali tank (2) and a salt tank (3), the acid tank (1), the alkali tank (2) and the salt tank (3) are respectively provided with water inlet pipes, the bottom of the acid tank (1), the alkali tank (2) and the salt tank (3) are respectively provided with a first water outlet pipe (4), a second water outlet pipe (5) and a third water outlet pipe (6), the first water outlet pipe (4), the second water outlet pipe (5) and the third water outlet pipe (6) are respectively provided with a first Y-type filter (7), a second Y-type filter (8) and a third Y-type filter (9), and the first water outlet pipe (4), the second water outlet pipe (5) and the third water outlet pipe (6) are respectively connected to the inlet of the cleaning device.

[0005] The cleaning device includes a first chemical tank (13) and a second chemical tank (14). The inlet of the first chemical tank (13) is connected to the second outlet pipe (5) and the third outlet pipe (6). The inlet of the second chemical tank (14) is connected to the first outlet pipe (4). The outlets of the first chemical tank (13) and the second chemical tank (14) are connected to a security filter (17) after passing through a first transfer pump (15) and a second transfer pump (16), respectively. The outlet of the security filter (17) is connected to a nanofiltration membrane module (18). The outlet of the nanofiltration membrane module (18) is provided with a circulating water pipe (19). The circulating water pipe (19) is connected to the inlet of the first chemical tank (13) and the second chemical tank (14), respectively.

[0006] The first medicine container (13) and the second medicine container (14) are respectively equipped with a first heater (20) and a second heater (21).

[0007] The first water outlet pipe (4), the second water outlet pipe (5), and the third water outlet pipe (6) are equipped with a first pulse damper (10), a second pulse damper (11), and a third pulse damper (12).

[0008] This invention further improves the service life of nanofiltration membranes and reduces the workload of personnel. By using an offline nanofiltration membrane cleaning device to clean individual nanofiltration membrane modules, compared to traditional online forward chemical cleaning which struggles to clean each membrane module thoroughly, the offline nanofiltration membrane cleaning device can effectively clean each membrane, significantly improving the cleaning effect. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the drug dispensing device of this utility model. Figure 2 This is a schematic diagram of the cleaning device of this utility model. Detailed Implementation

[0010] like Figure 1 , Figure 2As shown, the device includes a dosing device and a cleaning device. The dosing device includes an acid tank (1), an alkali tank (2) and a salt tank (3). The acid tank (1), alkali tank (2) and salt tank (3) are each provided with an inlet pipe. The bottom of the acid tank (1), alkali tank (2) and salt tank (3) are respectively provided with a first outlet pipe (4), a second outlet pipe (5) and a third outlet pipe (6). The first outlet pipe (4), the second outlet pipe (5) and the third outlet pipe (6) are respectively provided with a first Y-type filter (7), a second Y-type filter (8) and a third Y-type filter (9). The first outlet pipe (4), the second outlet pipe (5) and the third outlet pipe (6) are respectively connected to the inlet of the cleaning device. The cleaning device includes a first chemical tank (13) and a second chemical tank (14). The inlet of the first chemical tank (13) is connected to the second outlet pipe (5) and the third outlet pipe (6). The inlet of the second chemical tank (14) is connected to the first outlet pipe (4). The outlets of the first chemical tank (13) and the second chemical tank (14) are connected to a security filter (17) after passing through a first transfer pump (15) and a second transfer pump (16), respectively. The outlet of the security filter (17) is connected to a nanofiltration membrane module (18). The outlet of the nanofiltration membrane module (18) is provided with a circulating water pipe (19), which is connected to the inlets of the first chemical tank (13) and the second chemical tank (14), respectively. The first chemical tank (13) and the second chemical tank (14) are respectively provided with a first heater (20) and a second heater (21). The first water outlet pipe (4), the second water outlet pipe (5), and the third water outlet pipe (6) are equipped with a first pulse damper (10), a second pulse damper (11), and a third pulse damper (12).

[0011] During use, the cleaning solution is introduced into the membrane housing through the first transfer pump (15) or the second transfer pump (16) to clean the nanofiltration membrane module. For cleaning inorganic scale, 0.2% (W) hydrochloric acid (HCl) is used; for cleaning sulfate scale, 0.1% (W) NaOH is used; for cleaning metal oxides (such as iron), 1.0% (W) Na₂SO₄ is used; for cleaning inorganic colloids (sludge), silicon, and microbial membranes, 0.1% (W) NaOH is used; for cleaning organic matter, a two-step cleaning operation is used: the first step is cleaning with 0.1% (W) NaOH, and the second step is cleaning with 0.2% (W) hydrochloric acid (HCl). The cleaning effect is excellent.

Claims

1. An offline cleaning and repair device for nanofiltration membranes, comprising a dosing device and a cleaning device, characterized in that: The aforementioned chemical apparatus includes an acid tank (1), an alkali tank (2), and a salt tank (3). Each of the acid tank (1), alkali tank (2), and salt tank (3) is equipped with an inlet pipe. The bottom of each of the acid tank (1), alkali tank (2), and salt tank (3) is respectively equipped with a first outlet pipe (4), a second outlet pipe (5), and a third outlet pipe (6). Each of the first outlet pipe (4), second outlet pipe (5), and third outlet pipe (6) is equipped with a first Y-type filter (7), a second Y-type filter (8), and a third Y-type filter (9). The first outlet pipe (4), second outlet pipe (5), and third outlet pipe (6) are respectively connected to the inlet of a cleaning device. The cleaning device includes a first chemical agent. The first reagent tank (13) and the second reagent tank (14) are connected. The inlet of the first reagent tank (13) is connected to the second outlet pipe (5) and the third outlet pipe (6). The inlet of the second reagent tank (14) is connected to the first outlet pipe (4). The outlets of the first reagent tank (13) and the second reagent tank (14) are connected to the security filter (17) after passing through the first transfer pump (15) and the second transfer pump (16) respectively. The outlet of the security filter (17) is connected to the nanofiltration membrane module (18). The outlet of the nanofiltration membrane module (18) is provided with a circulating water pipe (19). The circulating water pipe (19) is connected to the inlet of the first reagent tank (13) and the second reagent tank (14) respectively.

2. The nanofiltration membrane offline cleaning and repair device according to claim 1, characterized in that: The first medicine container (13) and the second medicine container (14) are respectively equipped with a first heater (20) and a second heater (21).

3. The nanofiltration membrane offline cleaning and repair device according to claim 1, characterized in that: The first outlet pipe (4), the second outlet pipe (5), and the third outlet pipe (6) are equipped with a first pulse damper (10), a second pulse damper (11), and a third pulse damper (12).

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