CN114917379A

CN114917379A - Filter sterilization method

Info

Publication number: CN114917379A
Application number: CN202210564761.4A
Authority: CN
Inventors: 刘敏; 郑树盛; 徐虹; 刘高飞; 李文杰; 刘国强
Original assignee: Baotou Iron and Steel Group Co Ltd
Current assignee: Baotou Iron and Steel Group Co Ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-08-19

Abstract

The invention discloses a method for sterilizing a filter, which is characterized in that a bactericide is added into the filter, and the filter is positively washed by water, backwashed by water and scrubbed by air to remove bacteria bred in a filter material. The method can quickly recover the filtering capacity of the filter after sterilization, effectively remove suspended matters, organic matters, colloid, silt and the like in the pretreated water, improve the filtering effect, obviously improve the reverse osmosis pretreated water quality, stabilize the SD I value of reverse osmosis inlet water, and prolong the service life of the filter and the reverse osmosis. Meanwhile, the backwashing duration of the filter can be reduced, and the purpose of saving water is achieved.

Description

Filter sterilization method

Technical Field

The invention relates to a method for sterilizing a filter.

Background

The filtering material filter is a filtering device which is characterized in that various filtering materials are arranged in the filter according to the requirements of water treatment, water with higher turbidity is filtered by granular or non-granular filtering materials with certain thickness under certain pressure, suspended matters, organic matters, colloid particles, microorganisms, chlorine, odor, partial heavy metal ions and the like in the water are effectively intercepted and removed, and the effects of reducing the water turbidity and purifying the water quality are finally achieved.

In normal operation, water cleaning can be carried out according to the water quality condition, the dirt blocking capacity of the filter and the like. The water cleaning is mainly in a mode of water backwashing, water forward washing and compressed air blowing washing. However, as the filter is operated for a long time, bacteria can grow on a large area of the filter material in the filter due to the existence of the bacteria in the water, and particularly when the filter is used for reverse osmosis pretreatment, the water needs to be heated to meet the water inlet requirement, so that the bacterial growth speed of the filter is accelerated. The breeding of bacteria can cause the inner wall of the filter to generate thick biological mucous membrane, even cause the hardening of the filter material of the filter, and seriously reduce the water yield and the water quality of the filter and the service life of the filter material of the filter. When used as pretreatment for reverse osmosis, the method can also pollute the reverse osmosis membrane to prevent the reverse osmosis membrane from operating normally.

Disclosure of Invention

The invention aims to provide a filter sterilization method to overcome the defect that a filter material filter is easy to breed bacteria and ensure the normal operation of the filter.

In order to solve the technical problem, the invention adopts the following technical scheme:

the invention relates to a method for sterilizing a filter, which comprises the following steps:

firstly, carrying out water backwashing once before sterilizing the filter tank, and then sterilizing;

closing the water inlet valve and the water outlet valve of the filter, and simultaneously canceling the automatic backwashing of the automatic backwashing program;

thirdly, water in the filter tank to be sterilized is placed to the position 10cm lower than the medicine adding port, so that excessive bactericide is prevented from being added into the tank;

fourthly, adding a bactericide into each filter tank, wherein the adding amount of the bactericide is calculated according to the concentration required by the bactericide; opening the medicine adding port, and manually filling the bactericide into the filter tank;

slowly opening the water inlet door by hand, observing a peephole of the filter, and manually closing the water inlet door after water is added to the position 10cm above the filter material;

sixthly, soaking the bactericide for 48 hours, and opening an exhaust valve, a reverse exhaust valve and a compressed air inlet valve of the filter to scrub air twice every day, wherein the time interval is 8-12 hours, and each time lasts for 15-25 minutes; during air washing, whether the filter runs or not needs to be noticed; closing the compressed air inlet valve, the reverse exhaust valve and the exhaust valve after the air washing is finished;

seventhly, after soaking for 48 hours, opening a positive discharge valve, a reverse discharge valve, an exhaust valve and a blow-down valve to empty the liquid medicine;

after the filter tank is emptied, recovering each valve, selecting an automatic state, normally washing according to a program, and observing the pollution condition of washing water;

and ninthly, detecting the water quality of the effluent after the filter tank is washed, and recovering for later use after the water quality is qualified.

Further, the pressure of the compressed air is adjusted to 0.2-0.5 MPa.

Further, the pressure of the compressed air was adjusted to 0.3 MPa.

Further, in the step ((b)), the blow-off valve is not closed in the early stage, and the blow-off valve is closed after being flushed for a period of time.

Compared with the prior art, the invention has the following beneficial technical effects:

after disinfecting, the filter can be quickly recovered and filtered, suspended substances, organic matters, colloid, silt and the like in the pretreatment water can be effectively removed, the filtering effect is improved, the reverse osmosis pretreatment water quality is obviously improved, the reverse osmosis inlet SDI value is stable, and the service life of the filter and the reverse osmosis can be prolonged. Meanwhile, the backwashing duration of the filter can be reduced, and the purpose of saving water is achieved.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 is a schematic view of a dosing port;

FIG. 2 is a schematic of a filter valve;

description of the reference numerals: 1. a water inlet pipe; 2. a pressure gauge; 3. a water inlet valve; 4. backwashing a water outlet valve; 5. backwashing the water inlet valve; 6. a water outlet valve; 7. an intake valve; 8. a water discharge valve is positively washed; 9. a blowoff valve; 10. an exhaust valve; 11. a dosing valve.

Detailed Description

A method of sterilizing a filter, comprising the steps of:

firstly, water backwashing is carried out once (for removing colloid pollutants intercepted in a filter material) before the filter tank is sterilized, and then sterilization is carried out.

And secondly, closing a water inlet valve and a water outlet valve of the filter (if an automatic backwashing program exists, automatic backwashing is canceled, and misoperation is avoided).

Thirdly, water in the filter tank needing sterilization is placed to the position 10cm lower than the chemical adding port, so that the situation that the bactericide cannot be added due to excessive water in the tank is prevented.

Fourthly, adding bactericide into each filter tank, wherein the adding amount of the bactericide is calculated according to the concentration required by the bactericide. The medicine adding port is opened, and the bactericide is manually filled into the filtering tank.

Slowly opening the water inlet door manually, observing the peephole of the filter, and manually closing the water inlet door after water is added to the 10cm position on the filter material (the water cannot be filled to prevent medicine leakage during air washing).

Sixthly, soaking the bactericide for 48 hours, opening an exhaust valve, a reverse exhaust valve and a compressed air inlet valve of the filter to perform air scrubbing twice every day (the pressure of compressed air is adjusted to be about 0.3 MPa), and keeping the time interval of about 10 hours and 20 minutes each time. During air washing, attention needs to be paid to whether the filter runs; and closing the compressed air inlet valve, the reverse exhaust valve and the exhaust valve after the air washing is finished.

Seventhly, after soaking for 48 hours, opening the positive discharge valve, the reverse discharge valve, the exhaust valve and the drain valve to empty the liquid medicine.

And eighthly, after the filter tank is emptied, recovering each valve, selecting an automatic state, normally flushing according to a program (the drain valve is not closed in the early stage, and the drain valve is closed after flushing for a period of time), and observing the pollution condition of flushing water.

And ninthly, detecting the quality of the discharged water after the filtering tank is flushed, and recovering for standby after the water quality is qualified.

The invention mainly reforms the pressure gauge pipe of the filter, installs tee joint, 90 degree elbow, valve and pipe stub on the part connected with the filter, forms the medicine feeding mouth, can directly connect with the filter; when the filter operates normally, the valve is closed, and water in the filter is prevented from overflowing. After the sterilization is needed, the valve is opened, and the sterilization agent is poured into the filter through the medicine adding port for soaking sterilization.

TABLE 1 Filter Sterilization Process valve Condition (closed ● O)

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims

1. A method of sterilizing a filter, comprising the steps of:

firstly, backwashing the filter tank with water once before sterilization, and then sterilizing;

fourthly, adding a bactericide into each filter tank, wherein the adding amount of the bactericide is calculated according to the concentration required by the bactericide; opening the medicine adding port, and manually filling the bactericide into the filtering tank;

slowly opening the water inlet door manually, observing a peephole of the filter, and manually closing the water inlet door after water is added to a position 10cm above the filter material;

sixthly, soaking the bactericide for 48 hours, and opening an exhaust valve, a reverse exhaust valve and a compressed air inlet valve of the filter to scrub air twice every day, wherein the time interval is 8-12 hours, and each time lasts for 15-25 minutes; during air washing, whether the filter runs or not needs to be noticed; after the air washing is finished, closing the compressed air inlet valve, the back exhaust valve and the exhaust valve;

seventhly, opening a positive discharge valve, a reverse discharge valve, an exhaust valve and a drain valve after soaking for 48 hours to empty the liquid medicine;

2. The method of filter sterilization as claimed in claim 1, wherein the pressure of the compressed air is adjusted to 0.2-0.5 MPa.

3. The method of filter sterilization as claimed in claim 1, wherein the pressure of the compressed air is adjusted to 0.3 MPa.

4. Method for sterilizing filters according to claim 1, characterised in that in step (b) the blow-off valve is not closed at the front, and is closed after a certain period of flushing.