CN111453868B - CIP (cleaning in place) process for deep purification and filtration of drinking water by using membrane core - Google Patents

CIP (cleaning in place) process for deep purification and filtration of drinking water by using membrane core Download PDF

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CN111453868B
CN111453868B CN202010353276.3A CN202010353276A CN111453868B CN 111453868 B CN111453868 B CN 111453868B CN 202010353276 A CN202010353276 A CN 202010353276A CN 111453868 B CN111453868 B CN 111453868B
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electromagnetic valve
unit
water
drinking water
cleaning
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CN111453868A (en
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曾祥奎
曾华
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曾祥奎
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/283Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus
    • C02F2201/005Valves
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/04Flow arrangements
    • C02F2301/046Recirculation with an external loop
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/06Pressure conditions
    • C02F2301/066Overpressure, high pressure
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/14Maintenance of water treatment installations

Abstract

The utility model provides a be used for drinking water deep purification to filter membrane core and wash CIP technology, process flow includes life drinking water unit, coarse filtration unit, active carbon adsorption unit, precise filtration unit, high-pressure pump unit, membrane core filtration purification unit and purification drinking water tank unit, coarse filtration unit, active carbon adsorption unit and precise filtration unit are pretreatment systems, membrane core filtration purification unit and purification drinking water tank unit are drinking water deep purification system. The invention optimizes the traditional structure and reduces the investment cost of the CIP device; the better cleaning effect is obtained on the premise of simplifying CIP operation, the aim of effectively cleaning the filter membrane core is achieved, and the function of strengthening the sanitary environment for purifying the produced water is achieved; the CIP process parameter curve is set according to various membrane core characteristics, and membrane core cleaning is converted into automatic control, so that the operation is convenient; various technical problems caused by the fact that a CIP system is not configured on a drinking water deep purification filter membrane core are effectively eliminated; and simultaneously, the problem of microbial secondary pollution of the purified drinking water is effectively solved.

Description

CIP (cleaning in place) process for deep purification and filtration of drinking water by using membrane core
Technical Field
The invention belongs to the field of water purification, and particularly relates to a CIP (cleaning in place) process for deep purification of drinking water by using a filter membrane core.
Background
Along with the rapid development of industries such as industry, agriculture, medicine, chemical industry, petroleum, mineral products and the like, the natural and ecological environments are promoted to generate great changes, and the natural environment of the water body is threatened unprecedentedly. Water is the most important material base on which human beings rely for survival, so the problem of safety of drinking water has become a common concern for all human societies. Under the background, the drinking water purification industry is promoted to develop rapidly, and the production of various barreled drinking water, bottled purified water and bottled mineral water is industrialized, industrialized and scaled; various advanced purification devices for drinking water, including reverse osmosis, ultrafiltration, microfiltration and other non-industrial (drinking water in institutional groups and drinking water in home life) advanced purification devices, have also become new industries, and people have great expectations for advanced purification of drinking water.
In the industrial drinking water purification treatment production, along with the continuation of the operation time, microorganism, suspended solid and organic matter interception object sedimentary deposit are gradually formed on the surface of the filter element, thereby influencing the great reduction of the filtration efficiency of the membrane element assembly, the great increase of the energy consumption of water treatment operation, and even causing the system operation failure when the situation is serious. To eliminate the above problems, CIP systems are required to be provided to periodically clean the water treatment system during the industrial purification treatment of drinking water. The typical CIP system is composed of a cleaning water tank, an alkaline solution tank, an acid solution tank, a filter element cleaning solution preparation tank, a centrifugal cleaning pump and a plurality of corresponding connecting pipelines, automatic control and other multi-unit devices. The traditional CIP configuration and process flow for deep purification membrane core cleaning of drinking water are shown in FIG. 3.
The operation mode of CIP in the industrial drinking water purification treatment is as follows: the pretreatment system adopts domestic drinking water for back flushing, the deep purification membrane filter element is cleaned, and acid and alkali liquor cleaning and cleaning fluid cleaning are adopted according to requirements. The filter membrane core is effectively cleaned by periodically cleaning the purifier, so that the working pressure of the membrane core is reduced, the water purification system can stably operate, and the service life of the membrane core is prolonged. The deep purification device for non-industrial drinking water (drinking water in office groups and drinking water in family life) is different from the above situation: if a CIP system is configured in the drinking water deep purification system, the drinking water purification equipment is complex in structure, and a huge equipment structure is extremely not fused with the modern household living space; on the other hand, the manufacturing cost of the equipment is greatly increased, and the consumer market with an excessively high product price is difficult to accept. Therefore, it is not feasible and operational to deploy CIP systems in non-industrial potable water depth purification plants.
In the non-industrial deep water purification equipment for drinking water, although the CIP system is omitted, the equipment cost is favorably reduced, and the sale is promoted. Clearly, the core component of the drinking water deep purification device is a filtering filter core, including hollow fiber filtering, ultrafiltration, nanofiltration and reverse osmosis membrane core. Along with the continuous water purification operation time, a microorganism, organic matter suspended matters and easily-scaling mineral ion interception layer is gradually formed on the surface of the membrane core. In this case, if the deep purification system for drinking water is not equipped with the CIP device, the possible consequences include: firstly, the filtration efficiency of the membrane core is reduced, so that the water yield is reduced, the waste of water resources is caused, the electric energy consumption is increased, and the water purification operation cost is greatly increased; secondly, the long-term continuous operation inevitably causes the remarkable reduction of the filtering capacity of the drinking water pretreatment system, the deterioration of the filtering effect and the frequent replacement of the pretreatment filtering material; thirdly, the pollution of the filter element is intensified, and the membrane core is required to be replaced. Thus, the rejection of the membrane core is not caused by natural loss due to the use expiration of the filter element, but is caused by the failure of effective recovery of the membrane core due to pollution; fourthly, the drinking water deep purification system runs continuously for a long time, so that microorganism pollution is easily caused and biological toxin is generated in the water body, when the biological toxin is introduced into the drinking water body, the drinking water purified through the treatment does not improve the water quality, but increases the safety risk of the drinking water.
The core component of the drinking water purifier is a filtering membrane core, and as the price of various membrane cores of ultrafiltration, nanofiltration and reverse osmosis is not good, if the filter core is frequently replaced, the economic burden of consumers is increased, and simultaneously the waste of social resources is caused. As such, it is equivalent to artificially providing a barrier to limit the spread and application of drinking water purifiers in the consumer market.
Aiming at the problems existing in deep purification of drinking water, the technology of the invention provides a CIP (cleaning in place) process for deep purification of a drinking water filter element, which firstly greatly reduces the manufacturing cost of equipment and saves the occupied area and space of the equipment by simplifying the configuration of a CIP system; the good cleaning effect is ensured by process optimization; automatic operation is realized by fusing system configuration, so that the CIP process has higher practicability, economy and operability. The application through this technique makes drinking water deep purification membrane core CIP can realize daily use, effectively eliminates drinking water deep purification filter core because of not having all kinds of technical problem that CIP system caused.
Disclosure of Invention
Because drinking water has special physiological functionality, people do not rely on other selectivity or substitutability for drinking water. In the face of the current continuous scale expansion of transgenic agricultural crops, the non-standard use of pesticides and biological regulators in agricultural production; the animal remedy and the biological hormone are added in the fishery, the livestock and poultry breeding industry without control; food additives and food processing aids are illegally used in food processing, the pollution threat of natural environment and water body environment is increased day by day, the food safety risk is increased day by day due to the superposition of various factors, people have no ability to change the natural environment, and the safety of drinking water can only be held in the aspect of drinking purification treatment, so that the drinking water safety is expected to be used as the last line of defense for drinking water safety.
In order to overcome the defects in the prior art, the invention provides the CIP process for cleaning the filtering membrane core for deeply purifying the drinking water, the technical barrier of the deeply purifying the drinking water is eliminated through technical measures, and the boosting drinking water deeply purifying equipment can be integrated into the daily life of people as soon as possible, so that the drinking water purifying technology and equipment are promoted to the society and the public.
The technical scheme provided by the invention is as follows: a CIP (cleaning-in-place) process for deeply purifying and filtering a membrane core of drinking water comprises a domestic drinking water unit, a coarse filtering unit, an active carbon adsorption unit, a precise filtering unit, a high-pressure pump unit, a membrane core filtering and purifying unit and a drinking water purifying tank unit, wherein the coarse filtering unit, the active carbon adsorption unit and the precise filtering unit are pretreatment systems, and the membrane core filtering and purifying unit and the drinking water purifying tank unit are drinking water deep purification systems;
the domestic drinking water unit is connected with a water inlet of a first three-way reversing valve, an upper water through hole of the first three-way reversing valve is communicated with an upper water through pipe of the coarse filtering unit through a water through pipe provided with a fourth electromagnetic valve, the coarse filtering unit is communicated with a first water discharging pipe through the upper water through pipe provided with a first electromagnetic valve, the first electromagnetic valve is positioned on the outer side of a water loop where the fourth electromagnetic valve is positioned, and the coarse filtering unit is communicated with a lower water through hole of the first three-way reversing valve through a lower water through pipe provided with a seventh electromagnetic valve;
the coarse filtration unit is communicated with an upper water pipe of the activated carbon adsorption unit through a water pipe provided with a fifth electromagnetic valve, the activated carbon adsorption unit is communicated with a first drainage pipe through an upper water pipe provided with a second electromagnetic valve, the second electromagnetic valve is positioned outside a water loop where the fifth electromagnetic valve is positioned, and the activated carbon adsorption unit is communicated with a lower water port of the first three-way reversing valve through a lower water pipe provided with an eighth electromagnetic valve;
the active carbon adsorption unit is communicated with an upper water through pipe of the precise filtration unit through a water through pipe provided with a sixth electromagnetic valve, the precise filtration unit is communicated with a first water drainage pipe through the upper water through pipe provided with a third electromagnetic valve, the third electromagnetic valve is positioned on the outer side of a water loop where the sixth electromagnetic valve is positioned, and the precise filtration unit is communicated with a lower water through hole of the first three-way reversing valve through a lower water through pipe provided with a ninth electromagnetic valve;
a second three-way reversing valve is arranged between the precise filtering unit and the high-pressure pump unit, the precise filtering unit is connected with a left water through opening of the second three-way reversing valve, and the high-pressure pump unit is connected with a right water through opening of the second three-way reversing valve;
the high-pressure pump unit is communicated with the membrane core filtering and purifying unit through a water pipe, the membrane core filtering and purifying unit is connected with a first drainage pipe through an upper water pipe provided with a tenth electromagnetic valve, and the membrane core filtering and purifying unit is communicated with the purified drinking water tank unit through a water pipe; the purified drinking water tank unit is connected with the first drainage pipe through a lower water pipe provided with an eleventh electromagnetic valve, a lower water through port of the second three-way reversing valve is connected with the lower water pipe of the purified drinking water tank unit through a water pipe provided with a twelfth electromagnetic valve, and the eleventh electromagnetic valve is positioned on the outer side of a water loop where the twelfth electromagnetic valve is positioned; the water service pipe provided with the twelfth electromagnetic valve is connected with a second drain pipe, and the second drain pipe is provided with a thirteenth electromagnetic valve;
the operation method of the process comprises the following steps:
the first step is as follows: deeply purifying drinking water; opening an upper water through port of the first three-way reversing valve, closing a lower water through port, and reversing by the second three-way reversing valve to be in a waterway straight-through state; opening a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve and a tenth electromagnetic valve, and closing the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the seventh electromagnetic valve, the eighth electromagnetic valve, the ninth electromagnetic valve, the eleventh electromagnetic valve, the twelfth electromagnetic valve and the thirteenth electromagnetic valve; the domestic drinking water is respectively and positively introduced into the equipment of the coarse filtration unit, the active carbon adsorption unit and the precise filtration unit by utilizing the pressure of a water supply pipeline of the domestic drinking water unit, and then the high-pressure pump unit is used for pressurizing to purify the membrane core filtration purification unit, so that high-quality purified water is obtained and enters a purified drinking water tank;
the second step is that: cleaning a drinking water pretreatment system; opening a lower water through hole of the first three-way reversing valve, closing the upper water through hole, closing the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve, opening the seventh electromagnetic valve, the eighth electromagnetic valve, the ninth electromagnetic valve, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, and reversing the second three-way reversing valve to be in a closed state; the water supply pipeline pressure of the domestic drinking water unit is used for reversely feeding water, and the device bodies of a coarse filtering unit, an active carbon adsorption unit and a precise filtering unit in the pretreatment system are respectively cleaned;
the third step: cleaning a drinking water deep purification system; closing the eleventh electromagnetic valve and the twelfth electromagnetic valve, putting cleaning liquid into the purified drinking water tank unit according to the process requirements, and introducing purified water to prepare the cleaning liquid; opening a tenth electromagnetic valve, a twelfth electromagnetic valve, closing a thirteenth electromagnetic valve and reversing the three-way reversing valve II so as to communicate the circulating pipelines of the high-pressure pump unit, the membrane core filtering and purifying unit and the purified drinking water tank unit; then the high-pressure pump unit pressurizes and conveys the cleaning fluid, and the cleaning fluid sequentially cleans the filtering membrane core unit and the purified drinking water tank unit; trapped liquid of the membrane core filtering and purifying unit is discharged out of the system through a tenth electromagnetic valve, and permeated liquid of the membrane core filtering and purifying unit enters the purified drinking water tank unit; after the circulation cleaning, the high-pressure pump and the twelfth electromagnetic valve are closed, the eleventh electromagnetic valve, the twelfth electromagnetic valve and the thirteenth electromagnetic valve are opened after the cleaning solution is kept stand and soaked, so that the cleaning solution is emptied from the purified drinking water tank unit, and the cleaning solution cleaning is finished;
the fourth step: washing with water; a second three-way reversing valve is switched to be in a straight-through state; opening a tenth electromagnetic valve and an eleventh electromagnetic valve, and closing a twelfth electromagnetic valve and a thirteenth electromagnetic valve; open pretreatment systems, drinking water deep purification system according to first step operation in proper order, get into drinking water deep purification system water washing state, after purifying clear free from extraneous odour, the foreign matter of drinking water tank unit exhaust water, close the eleventh solenoid valve, convert drinking water deep purification operating condition into.
The preferable technical scheme is as follows: the drinking water purifying tank unit is provided with a ball float valve for the first step of deep purification of drinking water and the liquid level control of the stage of storing proper amount of purified water in the drinking water purifying tank unit in the third step.
The preferable technical scheme is as follows: and the purified drinking water tank unit is provided with a stirrer for preparing the cleaning solution in the purified drinking water tank unit in the third step, stirring and mixing.
The preferable technical scheme is as follows: in the second step, when the pretreatment system is cleaned, a time relay is adopted to control the electromagnetic valve to switch time, and the back washing time of the device body of each unit is set until the water discharged by the device body of each unit is clear and has no peculiar smell, impurities or foreign matters.
The preferable technical scheme is as follows: and in the third step, a time relay is adopted to control the cleaning time, and the best cleaning effect is achieved by adopting the cleaning liquid circulation, soaking or the combination of the circulation and the soaking.
The preferable technical scheme is as follows: and in the fourth step, in the deep purification running state of the drinking water, intermittently switching the three-way reversing valve II, closing the twelfth electromagnetic valve and opening the thirteenth electromagnetic valve, and flushing a (bypass) circulating pipeline between the high-pressure pump unit and the purified drinking water tank unit until the water discharged by the purified drinking water tank unit is clear and free from peculiar smell and foreign matters.
Due to the application of the technical scheme, compared with the prior art, the invention has the advantages that:
1. effectively eliminating various technical problems caused by the fact that a CIP system is not configured on the drinking water deep purification filter membrane core.
2. According to the difference of the process characteristics of the two units, the cleaning is carried out in two different modes, a better cleaning effect is obtained on the premise of simplifying CIP operation, so that the aim of effectively cleaning the filter membrane core is fulfilled, and the function of strengthening and purifying the water production sanitary environment is also fulfilled.
3. Optimize the structure and reduce the investment cost of the CIP device.
4. And setting a CIP process parameter curve according to various membrane core characteristics, and converting membrane core cleaning into automatic control.
5. Effectively solves the problems of the prior purified drinking water, such as ubiquitous and unsolved microbial secondary pollution, and improves the safety of the purified drinking water.
The process designed by the invention takes qualified domestic drinking water as raw water, and removes suspended matters in the water body by coarse filtration of the microporous filter in sequence; the chroma, turbidity and peculiar smell of the water quality are reduced through the adsorption of the active carbon; and partial fine particles, suspended matters and microorganisms in the water body are further removed through precise filtration, so that the quality of the drinking water is further improved. The variable-frequency high-pressure pump is used for providing operating pressure, drinking water is filtered by the membrane core (ultrafiltration, nanofiltration and reverse osmosis), microorganisms, suspended particles, organic matters and inorganic salt ions (nanofiltration and reverse osmosis) which are easy to scale in the water body are intercepted efficiently, and finally deep purification of the drinking water is realized to obtain high-quality and safe drinking water.
Drawings
Fig. 1 is a schematic view of a process flow of deep purification of drinking water by using membrane core filtration.
FIG. 2 is a flow chart of a CIP process for cleaning a deep purification and filtration membrane core of drinking water designed by the invention.
Fig. 3 is a flow chart of a conventional CIP configuration and process for deep purification of drinking water.
In the above drawings, a coarse filtration unit 01, an activated carbon adsorption unit 02, a fine filtration unit 03, a high-pressure pump unit 04, a membrane core filtration and purification unit 05, a purified drinking water tank unit 06, a first electromagnetic valve 1, a second electromagnetic valve 2, a third electromagnetic valve 3, a fourth electromagnetic valve 4, a fifth electromagnetic valve 5, a sixth electromagnetic valve 6, a seventh electromagnetic valve 7, an eighth electromagnetic valve 8, a ninth electromagnetic valve 9, a tenth electromagnetic valve 10, an eleventh electromagnetic valve 11, a twelfth electromagnetic valve 12, a thirteenth electromagnetic valve 13, a ball float valve 14, a stirrer 15, a first drain pipe 16, a second drain pipe 17, a first three-way reversing valve 100, and a second three-way reversing valve 200.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 3. It should be understood that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product of the present invention is usually placed in when used, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 and 2, a cleaning CIP process for deeply purifying and filtering a membrane core of drinking water, the process comprises a drinking water unit, a coarse filtration unit 01, an activated carbon adsorption unit 02, a precise filtration unit 03, a high-pressure pump unit 04, a membrane core filtering and purifying unit 05 and a purified drinking water tank unit 06, wherein the coarse filtration unit 01, the activated carbon adsorption unit 02 and the precise filtration unit 03 are pretreatment systems, and the membrane core filtering and purifying unit 05 and the purified drinking water tank unit 06 are deep drinking water purification systems;
the domestic drinking water unit is connected with a water inlet of the three-way reversing valve I100, an upper water through hole of the three-way reversing valve I100 is communicated with an upper water through pipe of the coarse filtering unit 01 through a water through pipe provided with a fourth electromagnetic valve 4, the coarse filtering unit 01 is communicated with the first water discharging pipe 16 through the upper water through pipe provided with a first electromagnetic valve 1, the first electromagnetic valve 1 is positioned at the outer side of a water loop where the fourth electromagnetic valve 4 is positioned, and the coarse filtering unit 01 is communicated with a lower water through hole of the three-way reversing valve I100 through a lower water through pipe provided with a seventh electromagnetic valve 7;
the coarse filtration unit 01 is communicated with an upper water pipe of the activated carbon adsorption unit 02 through a water pipe provided with a fifth electromagnetic valve 5, the activated carbon adsorption unit 02 is communicated with a first drain pipe 16 through an upper water pipe provided with a second electromagnetic valve 2, the second electromagnetic valve 2 is positioned outside a water loop where the fifth electromagnetic valve 5 is positioned, and the activated carbon adsorption unit 02 is communicated with a lower water port of a first three-way reversing valve 100 through a lower water pipe provided with an eighth electromagnetic valve 8;
the activated carbon adsorption unit 02 is communicated with an upper water pipe of the precise filtering unit 03 through a water pipe provided with a sixth electromagnetic valve 6, the precise filtering unit 03 is communicated with a first water discharge pipe 16 through the upper water pipe provided with a third electromagnetic valve 3, the third electromagnetic valve 3 is positioned at the outer side of a water loop where the sixth electromagnetic valve 6 is positioned, and the precise filtering unit 03 is communicated with a lower water opening of a first three-way reversing valve 100 through a lower water pipe provided with a ninth electromagnetic valve 9;
a second three-way reversing valve 200 is arranged between the precise filtering unit 03 and the high-pressure pump unit 04, the precise filtering unit 03 is connected with a left water through port of the second three-way reversing valve 200, and the high-pressure pump unit 04 is connected with a right water through port of the second three-way reversing valve 200;
the high-pressure pump unit 04 is communicated with the membrane core filtering and purifying unit 05 through a water pipe, the membrane core filtering and purifying unit 05 is connected with the first drainage pipe 16 through an upper water pipe provided with a tenth electromagnetic valve 10, and the membrane core filtering and purifying unit 05 is communicated with the purified drinking water tank unit 06 through the water pipe; the purified drinking water tank unit 06 is connected with the first drain pipe 16 through a lower water through pipe provided with an eleventh electromagnetic valve 11, a lower water through port of the three-way reversing valve II 200 is connected with the lower water through pipe of the purified drinking water tank unit 06 through a water through pipe provided with a twelfth electromagnetic valve 12, and the eleventh electromagnetic valve 11 is positioned outside a water loop where the twelfth electromagnetic valve 12 is positioned; a second water discharge pipe 17 is connected to the water pipe provided with the twelfth electromagnetic valve 12, and a thirteenth electromagnetic valve 13 is arranged on the second water discharge pipe 17;
the operation method of the process comprises the following steps:
the first step is as follows: deeply purifying drinking water; an upper water through hole of the first three-way reversing valve 100 is opened, a lower water through hole is closed, and a second three-way reversing valve 200 is in a waterway straight-through state in a reversing mode; opening a fourth electromagnetic valve 4, a fifth electromagnetic valve 5, a sixth electromagnetic valve 6 and a tenth electromagnetic valve 10, and closing a first electromagnetic valve 1, a second electromagnetic valve 2, a third electromagnetic valve 3, a seventh electromagnetic valve 7, an eighth electromagnetic valve 8, a ninth electromagnetic valve 9, an eleventh electromagnetic valve 11, a twelfth electromagnetic valve 12 and a thirteenth electromagnetic valve 13; the domestic drinking water is respectively and positively introduced into the equipment of the coarse filtration unit 01, the active carbon adsorption unit 02 and the precise filtration unit 03 by utilizing the pressure of a water supply pipeline of the domestic drinking water unit, and then the high-pressure pump unit 04 pressurizes the domestic drinking water to purify the membrane core filtration purification unit 05, so that high-quality purified water enters a purified drinking water tank;
the second step is that: cleaning a drinking water pretreatment system; opening a lower water through hole of a first three-way reversing valve 100, closing an upper water through hole, closing a fourth electromagnetic valve 4, a fifth electromagnetic valve 5 and a sixth electromagnetic valve 6, opening a seventh electromagnetic valve 7, an eighth electromagnetic valve 8, a ninth electromagnetic valve 9, a first electromagnetic valve 1, a second electromagnetic valve 2 and a third electromagnetic valve 3, and reversing a second three-way reversing valve 200 to be in a closed state; the water supply pipeline pressure of the domestic drinking water unit is used for reversely feeding water, and the device bodies of a coarse filtering unit 01, an active carbon adsorption unit 02 and a precise filtering unit 03 in the pretreatment system are respectively cleaned; when the pretreatment system is cleaned, a time relay is adopted to control the switching time of the electromagnetic valve, and the back washing time of the device body of each unit is set to be about 8-10 min until the water discharged by the device body of each unit is clear and has no peculiar smell, impurities or foreign matters.
The third step: cleaning a drinking water deep purification system; closing the eleventh electromagnetic valve 11 and the twelfth electromagnetic valve 12, putting cleaning liquid into the purified drinking water tank unit 06 according to the process requirements, introducing the purified water to prepare the cleaning liquid, controlling the liquid level of the purified water by a ball float valve 14 in the purified drinking water tank unit 06, stirring and mixing the cleaning liquid by using a stirrer 15 in the purified drinking water tank unit 06 to achieve a better cleaning effect, and executing the selection of the cleaning liquid, the concentration of the liquid medicine, the cleaning time and the cleaning period according to an operation manual provided by a membrane core supplier. Opening a tenth electromagnetic valve 10, a twelfth electromagnetic valve 12 and closing a thirteenth electromagnetic valve 13, reversing the three-way reversing valve II 200, and communicating the circulating pipelines of the high-pressure pump unit 04, the membrane core filtering and purifying unit 05 and the purified drinking water tank unit 06; then the high-pressure pump unit 04 pressurizes and conveys the cleaning liquid, the cleaning liquid sequentially cleans the filtering membrane core unit and the purified drinking water tank unit 06, and the best cleaning effect can be achieved by adopting the cleaning liquid circulation, soaking or the combination of the circulation and the soaking. During cleaning of the filtering membrane core unit, the trapped fluid of the membrane core filtering and purifying unit 05 is discharged out of the system through the tenth electromagnetic valve 10, and the permeate of the membrane core filtering and purifying unit 05 enters the purified drinking water tank unit 06; the CIP system controls the cleaning time by adopting a time relay. After the concentration of the cleaning liquid distributed in each part is uniform, closing the high-pressure pump unit 04 and the twelfth electromagnetic valve 12, standing the cleaning liquid for 30-60 min for soaking, and then opening the eleventh electromagnetic valve, the twelfth electromagnetic valve and the thirteenth electromagnetic valve to enable the purified drinking water tank unit 06 to empty the cleaning liquid, and finishing cleaning the cleaning liquid; inorganic salt cations trapped on the outer surface of the membrane core can be effectively removed through cleaning by the cleaning solution, so that the filtering capacity of the filtering membrane core is effectively recovered.
The fourth step: washing with water; switching a second three-way reversing valve 200 to be in a straight-through state; opening a tenth electromagnetic valve 10 and an eleventh electromagnetic valve 11, and closing a twelfth electromagnetic valve 12 and a thirteenth electromagnetic valve 13; open pretreatment systems in proper order according to first step operation, drinking water deep purification system, get into drinking water deep purification system water washing state, utilize and purify the drinking water and carry out water washing to purifying water tank, intermittent type conversion tee bend switching-over valve two 200, close twelfth solenoid valve 12, open thirteenth solenoid valve 13, wash high-pressure pump unit 04 and purify (bypass) circulation pipeline between the drinking water tank unit 06, it is clear free from extraneous odour until purifying drinking water tank unit 06 discharged water, close eleventh solenoid valve 11 behind the foreign matter of no impurity, convert into drinking water deep purification operating condition.
The invention has the advantages that:
1. according to the characteristics of the membrane core for advanced treatment of drinking water and the CIP process, the CIP applied in the traditional industrial production is firstly introduced into small and medium-sized (for families and institutions) drinking water advanced purification equipment by optimizing the configuration of the CIP system, so that various technical problems caused by the fact that the CIP system is not configured on the drinking water advanced purification filter membrane core are effectively solved.
2. The unit split is carried out in CIP device operation with drinking water advanced treatment, divides it into two operation units of pretreatment systems and drinking water advanced purification system (membrane core washs) to adopt two kinds of different modes to wash according to the difference of two unit process characteristics, obtain better cleaning performance under the prerequisite of simplifying CIP operation. The cleaning of the drinking water deep purification system is divided into two operation units, namely a pretreatment part system and the drinking water deep purification system (membrane core cleaning). When the pretreatment system is cleaned, the on-off control of an electromagnetic valve is adopted, and the timing backwashing of single equipment is carried out under the condition of keeping a certain pressure, so that the cleaning requirement of the CIP process can be met; the drinking water deep purification system (membrane core cleaning) is a high-cleaning area and is also a key cleaning area; the unit is cleaned by a cleaning solution CIP cleaning program so as to achieve the aim of effectively cleaning the filter membrane core and have the function of strengthening and purifying the water production sanitary environment.
3. Optimize the structure and reduce the investment cost of the CIP device. The pretreatment system can complete the cleaning operation of the unit by only increasing a proper number of electromagnetic valves through mutual conversion; when equipment is cleaned, the frequency converter is used for controlling the high-pressure pump to regulate the pressure of cleaning liquid, a cleaning liquid cleaning circulation loop is formed by the high-pressure pump unit, the membrane core filtering and purifying unit and the purified drinking water tank unit, and a cleaning circulation centrifugal pump is not required to be additionally arranged, so that the equipment and equipment investment cost of the CIP system are limited; through CIP washing, can increase substantially membrane core water production efficiency, increase equipment operating stability, promote the life who filters the membrane core by a wide margin, both reduced the user and changed the filter core frequency, saved the public resource consumption of society, can show the deep purification of drinking water working costs again simultaneously. Thus, the traditional complex and large CIP system is greatly simplified, so that the CIP configuration of the drinking water purifier is operable.
4. And setting a CIP process parameter curve according to various membrane core characteristics, and converting membrane core cleaning into automatic control. In the CIP system, temperature, liquid level and pressure sensors, a time relay, electric and pneumatic elements and elements of an automatic reversing valve form an automatic monitoring system and are simultaneously combined with an automatic programming controller (PLC) and human-computer interface control; according to four different membrane core type characteristics of precise filtration, ultrafiltration, reverse osmosis, nanofiltration and the like of the drinking water deep purification device, professional cleaning operation process parameter curves are provided by membrane core manufacturers and stored in an automatic controller. The membrane core CIP can realize automatic CIP only by manually adding cleaning solution or disinfectant and then starting a control program.
5. Effectively solving the problem of microbial secondary pollution of the purified drinking water. In industrial production, drinking water is subjected to ozone or ultraviolet sterilization treatment after purification, and then is filled and sealed, and the microbial control of the purified drinking water is effective and relatively safe under the conditions. However, for the deep purification equipment of drinking water without the CIP cleaning device, because the membrane core continuously intercepts microorganisms, the equipment can continuously operate for a long time and inevitably cause a great amount of growth and reproduction of the microorganisms, and the phenomenon that the surface of the water storage chamber of the water dispenser is sticky can be seen by naked eyes, which is the basic characteristic that the drinking water is polluted by the microorganisms; in a state where the growth and reproduction of microorganisms are out of control, it is inevitable that biotoxins produced by the metabolism of microorganisms enter the drinking water. If people drink drinking water with safety risks for a long time, a plurality of potential safety hazards are accumulated day by day and month, and serious threats can be formed to health of special groups, such as pregnant women, infants, weak people, old people and the like; if a social physiological health problem occurs, the consequences can be disastrous and unreasonable. If the above-mentioned problems cannot be solved effectively, no matter what kind of high-quality drinking water is prepared, the purified water actually drunk by people is not called high-quality drinking water. The invention organically combines the deep purification membrane core cleaning of the drinking water with the CIP process, not only solves the problem of drinking water safety hazard caused by the microbial pollution of the terminal drinking water, but also ensures that the drinking water is high-quality purified drinking water in the true sense.
The process designed by the invention comprises the following steps: qualified domestic drinking water is taken as raw water, and suspended matters in the water body are removed through coarse filtration by a microporous filter in sequence; the chroma, turbidity and peculiar smell of the water quality are reduced through the adsorption of the active carbon; and partial fine particles, suspended matters and microorganisms in the water body are further removed through precise filtration, so that the quality of the drinking water is further improved. Then purifying the filter membrane core: the variable-frequency high-pressure pump is used for providing operating pressure, drinking water is filtered by the membrane core (ultrafiltration, nanofiltration and reverse osmosis), microorganisms, suspended particles, organic matters and inorganic salt ions (nanofiltration and reverse osmosis) which are easy to scale in the water body are intercepted efficiently, and finally deep purification of the drinking water is realized to obtain high-quality and safe drinking water.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (6)

1. A CIP (cleaning in place) process for deep purification and filtration of drinking water, which is characterized in that: the process comprises a domestic drinking water unit, a coarse filtration unit, an active carbon adsorption unit, a precise filtration unit, a high-pressure pump unit, a membrane core filtration and purification unit and a drinking water purification tank unit, wherein the coarse filtration unit, the active carbon adsorption unit and the precise filtration unit are pretreatment systems, and the membrane core filtration and purification unit and the drinking water purification tank unit are drinking water deep purification systems;
the domestic drinking water unit is connected with a water inlet of a first three-way reversing valve, an upper water through hole of the first three-way reversing valve is communicated with an upper water through pipe of the coarse filtering unit through a water through pipe provided with a fourth electromagnetic valve, the coarse filtering unit is communicated with a first water discharging pipe through the upper water through pipe provided with a first electromagnetic valve, the first electromagnetic valve is positioned on the outer side of a water loop where the fourth electromagnetic valve is positioned, and the coarse filtering unit is communicated with a lower water through hole of the first three-way reversing valve through a lower water through pipe provided with a seventh electromagnetic valve;
the coarse filtration unit is communicated with an upper water pipe of the activated carbon adsorption unit through a water pipe provided with a fifth electromagnetic valve, the activated carbon adsorption unit is communicated with a first drainage pipe through an upper water pipe provided with a second electromagnetic valve, the second electromagnetic valve is positioned outside a water loop where the fifth electromagnetic valve is positioned, and the activated carbon adsorption unit is communicated with a lower water port of the first three-way reversing valve through a lower water pipe provided with an eighth electromagnetic valve;
the active carbon adsorption unit is communicated with an upper water through pipe of the precise filtration unit through a water through pipe provided with a sixth electromagnetic valve, the precise filtration unit is communicated with a first water drainage pipe through the upper water through pipe provided with a third electromagnetic valve, the third electromagnetic valve is positioned on the outer side of a water loop where the sixth electromagnetic valve is positioned, and the precise filtration unit is communicated with a lower water through hole of the first three-way reversing valve through a lower water through pipe provided with a ninth electromagnetic valve;
a second three-way reversing valve is arranged between the precise filtering unit and the high-pressure pump unit, the precise filtering unit is connected with a left water through opening of the second three-way reversing valve, and the high-pressure pump unit is connected with a right water through opening of the second three-way reversing valve;
the high-pressure pump unit is communicated with the membrane core filtering and purifying unit through a water pipe, the membrane core filtering and purifying unit is connected with a first drainage pipe through an upper water pipe provided with a tenth electromagnetic valve, and the membrane core filtering and purifying unit is communicated with the purified drinking water tank unit through a water pipe; the purified drinking water tank unit is connected with the first drainage pipe through a lower water pipe provided with an eleventh electromagnetic valve, a lower water through port of the second three-way reversing valve is connected with the lower water pipe of the purified drinking water tank unit through a water pipe provided with a twelfth electromagnetic valve, and the eleventh electromagnetic valve is positioned on the outer side of a water loop where the twelfth electromagnetic valve is positioned; the water service pipe provided with the twelfth electromagnetic valve is connected with a second drain pipe, and the second drain pipe is provided with a thirteenth electromagnetic valve;
the operation method of the process comprises the following steps:
the first step is as follows: deeply purifying drinking water; opening an upper water through port of the first three-way reversing valve, closing a lower water through port, and reversing by the second three-way reversing valve to be in a waterway straight-through state; opening a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve and a tenth electromagnetic valve, and closing the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the seventh electromagnetic valve, the eighth electromagnetic valve, the ninth electromagnetic valve, the eleventh electromagnetic valve, the twelfth electromagnetic valve and the thirteenth electromagnetic valve; the domestic drinking water is respectively and positively introduced into the equipment of the coarse filtration unit, the active carbon adsorption unit and the precise filtration unit by utilizing the pressure of a water supply pipeline of the domestic drinking water unit, and then the high-pressure pump unit is used for pressurizing to purify the membrane core filtration purification unit, so that high-quality purified water is obtained and enters a purified drinking water tank;
the second step is that: cleaning a drinking water pretreatment system; opening a lower water through hole of the first three-way reversing valve, closing the upper water through hole, closing the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve, opening the seventh electromagnetic valve, the eighth electromagnetic valve, the ninth electromagnetic valve, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, and reversing the second three-way reversing valve to be in a closed state; the water supply pipeline pressure of the domestic drinking water unit is used for reversely feeding water, and the device bodies of a coarse filtering unit, an active carbon adsorption unit and a precise filtering unit in the pretreatment system are respectively cleaned;
the third step: cleaning a drinking water deep purification system; closing the eleventh electromagnetic valve and the twelfth electromagnetic valve, putting cleaning liquid into the purified drinking water tank unit according to the process requirements, and introducing purified water to prepare the cleaning liquid; opening a tenth electromagnetic valve, a twelfth electromagnetic valve, closing a thirteenth electromagnetic valve and reversing the three-way reversing valve II so as to communicate the circulating pipelines of the high-pressure pump unit, the membrane core filtering and purifying unit and the purified drinking water tank unit; then the high-pressure pump unit pressurizes and conveys the cleaning fluid, and the cleaning fluid sequentially cleans the filtering membrane core unit and the purified drinking water tank unit; trapped liquid of the membrane core filtering and purifying unit is discharged out of the system through a tenth electromagnetic valve, and permeated liquid of the membrane core filtering and purifying unit enters the purified drinking water tank unit; after the circulation cleaning, the high-pressure pump and the twelfth electromagnetic valve are closed, the eleventh electromagnetic valve, the twelfth electromagnetic valve and the thirteenth electromagnetic valve are opened after the cleaning solution is kept stand and soaked, so that the cleaning solution is emptied from the purified drinking water tank unit, and the cleaning solution cleaning is finished;
the fourth step: washing with water; a second three-way reversing valve is switched to be in a straight-through state; opening a tenth electromagnetic valve and an eleventh electromagnetic valve, and closing a twelfth electromagnetic valve and a thirteenth electromagnetic valve; open pretreatment systems, drinking water deep purification system according to first step operation in proper order, get into drinking water deep purification system water washing state, after purifying clear free from extraneous odour, the foreign matter of drinking water tank unit exhaust water, close the eleventh solenoid valve, convert drinking water deep purification operating condition into.
2. The CIP process for deep purification and filtration membrane core cleaning of drinking water according to claim 1, characterized in that: the drinking water purifying tank unit is provided with a ball float valve for the first step of deep purification of drinking water and the liquid level control of the stage of storing proper amount of purified water in the drinking water purifying tank unit in the third step.
3. The CIP process for deep purification and filtration membrane core cleaning of drinking water according to claim 2, characterized in that: and the purified drinking water tank unit is provided with a stirrer for preparing the cleaning solution in the purified drinking water tank unit in the third step, stirring and mixing.
4. The CIP process for deep purification and filtration membrane core cleaning of drinking water according to claim 3, characterized in that: in the second step, when the pretreatment system is cleaned, a time relay is adopted to control the electromagnetic valve to switch time, and the back washing time of the device body of each unit is set until the water discharged by the device body of each unit is clear and has no peculiar smell, impurities or foreign matters.
5. The CIP process for deep purification and filtration membrane core cleaning of drinking water according to claim 4, characterized in that: and in the third step, a time relay is adopted to control the cleaning time, and the best cleaning effect is achieved by adopting the cleaning liquid circulation, soaking or the combination of the circulation and the soaking.
6. The CIP process for deep purification and filtration membrane core cleaning of drinking water according to claim 5, characterized in that: and in the fourth step, in the deep purification running state of the drinking water, intermittently switching the three-way reversing valve II, closing the twelfth electromagnetic valve and opening the thirteenth electromagnetic valve, flushing a circulating pipeline between the high-pressure pump unit and the purified drinking water tank unit until the water discharged by the purified drinking water tank unit is clear, free from peculiar smell and free from foreign impurities.
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CN102874959A (en) * 2011-07-13 2013-01-16 江苏美淼环保科技有限公司 Technology for deep purification of drinking water
CN107879524A (en) * 2017-11-28 2018-04-06 张家港市金马星机械制造有限公司 Can online backwashing reverse osmosis water treatment system
CN109179748A (en) * 2018-09-04 2019-01-11 曾祥奎 A kind of Drinking Water Filtration technique using nanofiltration membrane
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