CN116715342A - Pipeline direct drinking water secondary pollution treatment method and pipeline direct drinking water system - Google Patents

Abstract

The invention discloses a method for treating secondary pollution of pipeline direct drinking water and a pipeline direct drinking water system. The processing method includes: setting a first working mode and a second working mode respectively according to the water use frequency of users in the target area. Under the first working mode , the circulation drive device turns on the first preset time period every first preset period, and the circulation processing device performs ozone disinfection for the second preset time period and ultraviolet disinfection for the third preset time period every first preset period; in the second working mode down to close the circulation drive. This treatment method solves the problem of excessive microorganisms and excessive ozone in water caused by secondary pollution of pipelines at a lower cost by controlling the duration of ozone disinfection, the duration of ultraviolet disinfection and the duration of water circulation driven by the circulation drive device in the first working mode. This resulted in excessive bromate levels and the high cost of keeping the cycle drive open.

Description

Pipeline direct drinking water secondary pollution treatment method and pipeline direct drinking water system

Technical field

The present invention relates to the technical field of pipeline direct drinking water, and in particular, to a pipeline direct drinking water secondary pollution treatment method and a pipeline direct drinking water system.

Background technique

Direct drinking water systems will be established in office buildings, teaching buildings, dormitories and other places to facilitate users' access. The direct drinking water system mainly purifies the raw water by setting up purification equipment in the host room to sterilize and disinfect the raw water to produce direct drinking water. The direct drinking water is produced by Water tanks are stored, and water dispensers are installed in each dormitory, classroom, etc., and the water tanks are supplied to each water dispenser through water supply pipes.

In the existing technology, due to the long distance between the water tank and each water dispenser, in order to ensure the hygiene and safety of drinking water reaching the end of the water supply pipeline and avoid sensory discomfort caused by microbial regeneration and potential risks to user health, drinking water needs to be disinfected , one is to kill or inactivate pathogenic microorganisms in source water; the other is to prevent microorganisms from reproducing and ensure the biological stability of drinking water by retaining part of the disinfectant residue. Among many drinking water disinfection methods, ozone is favored due to its strong ability to inactivate a variety of microorganisms and its lack of chlorine smell. In recent years, its application scope has gradually expanded in practical projects. However, ozone is unstable, easy to decompose, and has poor continuous disinfection effect. Moreover, ozone can oxidize large molecular organic matter in the water into small molecular organic matter that is easy to biodegrade, thereby providing nutrients for microorganisms, causing microorganisms in the pipeline to grow and reproduce again, affecting water quality and Threat to user health. In addition, the scale of the piped direct drinking water system matches the user's water consumption in the target environment, but the frequency of water use by users in different application environments is different. If the direct drinking water has not been taken for a long time or the amount is small, the direct drinking water in the water supply pipe will Long-term accumulation can easily cause secondary pollution, causing the water quality when collecting water to completely fail to meet drinking standards.

In the existing technology, ultraviolet disinfection is also used to disinfect direct drinking water. However, under peak water usage conditions, it is difficult to match ultraviolet disinfection with water consumption, the disinfection effect is extremely limited, and the output direct drinking water cannot meet drinking water standards. Based on this, the existing technology also uses a disinfection method that combines ozone disinfection and ultraviolet disinfection. However, in actual applications, it is affected by the frequency of water use in different environments. There is also the problem of excessive bromate by-products caused by excessive ozone concentration. , there is also the problem of using ultraviolet for too long, causing the output water quality to fail to meet drinking standards.

Although some pipeline direct drinking water systems are equipped with circulation systems to maintain water circulation and purification, keeping the water circulation open requires high energy consumption and high costs. The circulation drive device is usually turned on intermittently or periodically, so it is still affected by ozone concentration and water pollution. The impact of accumulation in pipelines and the impact of UV disinfection time.

Contents of the invention

The invention provides a secondary pollution treatment method for pipeline direct drinking water and a pipeline direct drinking water system to solve the technical problem in the prior art that pipeline direct drinking water accumulates in the pipeline and is susceptible to secondary pollution.

The technical solutions adopted by the present invention are as follows:

A method for treating secondary pollution of pipeline direct drinking water, which is used in a pipeline direct drinking water system. The pipeline direct drinking water system includes a water production system, a circulating water supply system and a control system. The circulating water supply system includes a circulation driving device, a circulation processing device, and a production system. The water storage device connected to the water system and the water intake device installed at each target water supply position. The water intake device is connected to the water storage device through the water supply pipe. The circulation drive device is used to extract the water in the water supply pipe through the circulation pipe to the circulation treatment device for purification treatment. The above treatment methods include:

Set the first working mode and the second working mode respectively according to the water use frequency of users in the target area,

In the first working mode, the circulation drive device turns on the first preset time period every first preset period, and the circulation processing device performs ozone disinfection for the second preset time period and ultraviolet disinfection for the third preset time period every first preset period. , the time starting point of the first preset duration is the same as the time starting point of the first preset period; the time starting point of the second preset duration is the same as the time starting point of the first preset period, and/or The time starting point of the third preset period is the same as the time point of the first preset period; the second preset period and the third preset period overlap or overlap within the first preset period. Distributed alternately or at intervals;

In the second operating mode, the circulation drive is switched off.

As a further improvement of the above technical solution, the second preset duration and the third preset duration are set in a preset ratio.

As a further improvement of the above technical solution, the first preset period is 0.5-3h, the second preset time period is 0.01-0.6h, and the third preset time period is 0.1-0.6h.

As a further improvement of the above technical solution, when the first working mode and the second working mode are respectively set according to the water use frequency of users in the target area, the processing method further includes: when the water use rate is lower than the preset value for more than a fourth preset time period , turn on the first working mode, and when the water rate is higher than the preset value, turn on the second working mode.

As a further improvement of the above technical solution, the pipeline direct drinking water system is provided with a dosing device connected to the water storage device, and the processing method includes:

Every second preset period, the control system controls the dosing device to put a preset amount of disinfectant into the water storage device, and the control system controls the circulation drive device to work so that the water in the pipeline direct drinking water system is in the water storage device. The preset time for circulation in the piped drinking water system.

As a further improvement of the above technical solution, the control system controls the circulation drive device to work so that the water in the pipeline direct drinking water system circulates in the pipeline direct drinking water system for a preset time. The processing method also includes: opening the water intake device , drain the water from the piped drinking water system.

As a further improvement of the above technical solution, the processing method also includes: first preset duration * flow rate of the circulation driving device ≥ water storage capacity of the water supply pipeline.

As a further improvement of the above technical solution, the water storage capacity of the water storage device matches the water consumption of the target area. Every 500 people are matched with a water storage device with a water storage capacity of 500-700L, and every 1,000 people are matched with a water storage device with a 900-1100L water storage capacity.

As a further improvement of the above technical solution, the power of the ultraviolet disinfection matched with the 500-700L water storage device is 20W, and the power of the ultraviolet disinfection matched with the 900-1100L water storage device is 40W; the 500-700L water storage device The matching concentration of ozone disinfection is 0.5g/h; the matching concentration of ozone disinfection for a 900-1100L water storage device is 1g/h.

According to another aspect of the present invention, a pipeline direct drinking water system is also provided, applying any of the above mentioned pipeline direct drinking water secondary pollution treatment methods.

The present invention has the following beneficial effects: the processing method sets the first working mode and the second working mode respectively according to the frequency of water use by users in the target area. The first working mode is used when the frequency of water use is low or no water is used, and the cycle driving device is used every time. The first preset period works for a first preset period of time, the circulation processing device performs ozone disinfection for a second preset period of time in every first preset period, and performs ultraviolet rays of a third preset period of time in every first preset period. Disinfection, and the time starting point of the first preset duration is the same as the time starting point of the first preset period, that is, when the first working mode is turned on, the circulation drive device is started to allow the water in the water supply pipe to flow back to the water storage device for disinfection. Disinfection; the time starting point of the second preset duration or the time starting point of the third preset duration is the same as the time starting point of the first preset period, that is, when entering the first working mode, the calculation of the first preset period starts and at least one disinfection is enabled. method to prevent the system from increasing water consumption and not effectively disinfecting after switching to the second working mode; the first preset cycle is a cycle comprehensively set based on the changes in water quality in the pipeline under different application environments and the water use rate in the application environment, that is, The first preset period should be less than the period of time when the quality of the direct drinking water in the system does not meet the requirements due to secondary contamination of the pipeline. At the same time, the first preset period should be set within this time range with reference to the user's water usage habits in the application environment; the second preset period should be the same as The third preset duration can overlap or be distributed alternately or at intervals, that is, ozone disinfection and ultraviolet disinfection can be turned on at the same time, alternately, or successively; by controlling the ozone disinfection duration, ultraviolet disinfection duration, and cycle in the first working mode The duration of the water circulation driven by the driving device circulates the water in the pipeline to ensure that the microorganisms in the water output by the water intake device are lower than the warning value and the ozone by-product bromate is lower than the warning value to avoid secondary pollution of the pipeline and disinfect the ozone through reasonable distribution. and the length of ultraviolet disinfection, taking full advantage of the by-product-free advantages of ultraviolet disinfection under low water consumption, and avoiding the problem of ozone accumulation and decomposition to produce oxides that allow microorganisms to breed again, while significantly reducing the cost of disinfection treatment; when using water When the frequency is higher than the preset value, the second working mode is turned on, and the circulation treatment device is closed. At this time, the residence time of direct drinking water in the pipeline is extremely short; according to this pipeline secondary pollution treatment method, the pipeline direct drinking water system can match the water use in the application environment. According to the different working modes of low-peak water use and peak water use, circulation processing and disinfection processing are selectively started, and the problem of excessive microorganisms and ozone content in water caused by secondary pollution of pipelines is solved at a lower cost. The problem of excessive bromate caused by excessive size, the difficulty of matching water consumption for ultraviolet disinfection, and the high cost caused by keeping the circulation drive device open.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.

Description of the drawings

The drawings forming a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 is a schematic structural diagram of a preferred embodiment of the present invention;

Figure 2 is a schematic structural diagram of Embodiment 1 of the present invention;

9. Water supply pipeline 10, water intake device 11, circulation pipeline 100, water production system.

Detailed ways

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Referring to Figures 1 to 2, a preferred embodiment of the present invention provides a secondary pollution treatment method for pipeline direct drinking water, which is used in a pipeline direct drinking water system. The pipeline direct drinking water system includes: a water production system 100 for communicating with an external water source Connect and purify the input water to output direct drinking water; the circulating water supply system includes a water storage device for storing the purified direct drinking water of the water production system 100, and the water storage device is connected to the water production system 100; also includes The water intake device 10 is respectively provided at each target water supply position. The water intake device 10 is connected to the water storage device through the water supply pipe 9; it also includes a circulation drive device and a circulation processing device. An inlet end of the water storage device is connected to the water supply pipe through the circulation pipe 11. 9 is close to one end of the water intake device 10 or connected to the end of the water outlet of the water intake device 10. The circulation processing device is arranged on the water storage device or on the circulation pipe 11; the circulation driving device is used to extract the water in the water supply pipe 9 through the circulation pipe 11 to the circulation The treatment device performs purification treatment.

It should be understood that the water intake device 10 can be a water dispenser, a faucet, etc. installed at each target water supply position; the water dispenser uses a 3G certified wall-mounted water dispenser, and the water dispenser has a certain water storage capacity, which can effectively alleviate the problem of large-scale water use. The water supply pressure ensures the water output; the circulation drive device is a food-grade circulation pump installed on the water supply pipe 9 and/or the circulation pipe 11, which can be a food-grade 304 stainless steel circulation pump CWP; each pipe (i.e., the water supply pipe 9, the circulation pipe 11) Use food-grade PPR pipes or food-grade PE pipes; water storage devices include food-grade water storage tanks.

It can be understood that this pipeline direct drinking water system purifies the external water source through the water production system 100 and stores it in the water storage device. The water storage device supplies water to each water intake device 10 through the water supply pipeline 9 of the circulating water supply system. The user can Direct drinking water is obtained from the water intake device 10 at any target water intake position; the circulation pipe 11 connects the water outlet position close to the water intake device 10 to the water production system 100, and the circulation drive device drives the water in the water supply pipe 9 to pass through the circulation pipe 11 to The circulation treatment device, from the circulation treatment device to the water storage device after purification again, circulates the water in the pipeline and the water dispenser, effectively solving the secondary pollution problem of direct drinking water in the water supply pipeline 9 and ensuring water quality.

It should be noted that this direct drinking water system can be further equipped with a control system to control the opening and closing time of the recovery treatment device and the circulation drive device, thereby controlling the interval and single treatment time of the water circulation treatment in the pipeline; its specific setting time Adaptive settings should be made based on the amount of water that can be stored in the pipeline under the system scale, and can be further adapted according to the water intake time distribution under the system setting environment; in this embodiment, the water production system 100 includes a filtering device, and the filtering device includes a reverse osmosis purifier. Water purifiers and/or nanofiltration water purifiers can be selectively set according to actual conditions. Among them, in nanofiltration water purifiers, the pore size of the nanofiltration element ranges between 0.01-0.001 microns; it can filter out antibiotics, hormones, pesticides, and petroleum. , detergents, heavy metals, algal toxins and other chemical pollutants; mineral ions smaller than this pore size can pass through; beneficial minerals can be effectively retained; the reverse osmosis water purifier uses a special high-pressure water pump to increase the pressure of the raw water, so that Under the action of pressure, raw water penetrates through the reverse osmosis membrane with a pore size of only 0.0001 micron. Chemical ions, bacteria, fungi, and virions cannot pass through and are discharged with the wastewater. Only pure water molecules with a volume less than 0.0001 microns are allowed to pass through, that is, pure water; the circulation treatment device includes an ozone treatment device, which includes an ozone generator and Mixer 6. The mixer 6 is used to mix the input water and ozone for purification.

The circulation treatment device also includes ultraviolet disinfection lamps. Ultraviolet sterilization uses ultraviolet rays of appropriate wavelengths to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in microbial cells, causing growth cell death and/or Regenerative cell death achieves the effect of sterilization and disinfection. Ultraviolet disinfection technology is based on modern anti-epidemic medicine and photodynamics. It uses specially designed high-efficiency, high-intensity and long-life UVC band ultraviolet light to irradiate running water to remove various bacteria, viruses, parasites, algae and other bacteria in the water. Pathogens are killed directly.

In this embodiment, the circulation driving device includes a water collector. The outlet end of the water collector is connected to the water storage device through a circulation pipe 11. One end of the water outlet of each water intake device 10 is connected to the inlet end of the water collector through the circulation pipe 11. .

It can be understood that the water production system 100, control system, water storage device, circulation processing device and circulation driving device of this embodiment can be installed in the same control room/machine room, making operation and maintenance convenient.

This treatment method includes:

Set the first working mode and the second working mode respectively according to the water use frequency of users in the target area,

In the first working mode, the circulation drive device turns on the first preset time period every first preset period, and the circulation processing device performs ozone disinfection for the second preset time period and ultraviolet disinfection for the third preset time period every first preset period. , the time starting point of the first preset duration is the same as the time starting point of the first preset period; the time starting point of the second preset duration is the same as the time starting point of the first preset period, and/or the third preset duration is The time starting point is the same as the time starting point of the first preset period, and the second preset duration and the third preset duration overlap or are distributed alternately or at intervals within the first preset period;

In the second operating mode, the circulation drive is switched off.

Among them, the water storage capacity of the water storage device matches the water consumption of the target area. Among them, every 100 people are matched with a water storage device with a water storage capacity of 500-700L, and every 1,000 people are matched with a water storage device with a 900-1100L water storage capacity; a water storage device with a 500-700L water storage capacity is matched. The matching power of the ultraviolet disinfection is 20W, and the matching power of the ultraviolet disinfection for the 900-1100L water storage device is 40W; the matching concentration of the ozone disinfection for the 500-700L water storage device is 0.5g/h; 900 The concentration of the ozone disinfection matched by the -1100L water storage device is 1g/h; the rated power of the ozone generator in this embodiment is 405W, and the rated output of ozone: 5g/h; the maximum flow rate of the circulation drive device is 5 cubic meters/h. Rated power 1500W;

Specifically in this embodiment, 500 people use a 600L water storage device, and every 1,000 people use a 1,000L water storage device; a 600L water storage device uses a 20W power ultraviolet disinfection device, and a 1,000L water storage device Matching the ultraviolet disinfection device with 40W power specification;

The first preset duration in this embodiment may be the total duration of disinfection within the first preset cycle, that is, the cycle driving device is kept on during the disinfection process; further, before any disinfection method is performed, the first preset duration is turned on. The cycle drive device of a certain duration ensures that the water stored in the water supply pipeline flows into the water storage device, thereby realizing the re-sterilization of the water stored in the original water supply pipeline. Based on this, the first preset duration * the flow rate of the cycle drive device ≥ the water storage capacity of the water supply pipeline;

It can be understood that this processing method sets the first working mode and the second working mode respectively according to the frequency of water use by users in the target area. The first working mode is used when the frequency of water use is low or no water is used, and the circulation drive device is used every first time. The cycle processing device works for a first preset period of time in a preset period, and performs ozone disinfection of a second preset period of time in every first preset period, and performs ultraviolet disinfection of a third preset period of time in every first preset period. Moreover, the time starting point of the first preset duration is the same as the time starting point of the first preset period, that is, when the first working mode is turned on, the circulation driving device is started to cause the water stored in the water supply pipe to flow back to the water storage device for disinfection; The time starting point of the second preset duration or the time starting point of the third preset duration is the same as the time starting point of the first preset period, that is, when entering the first working mode, the calculation of the first preset period starts and at least one disinfection method is enabled, To prevent the system from increasing water consumption and switching to the second working mode without effective disinfection; the first preset cycle is a cycle comprehensively set based on the changes in water quality in the pipeline under different application environments and the water use rate in the application environment, that is, the first The preset period should be less than the period of time when the quality of the direct drinking water in the system does not meet the requirements due to secondary contamination of the pipeline. At the same time, the first preset period should be set within this time range based on the user's water usage habits in the application environment; the second preset period should be the same as the third The preset durations can overlap or be distributed alternately or at intervals, that is, ozone disinfection and ultraviolet disinfection can be turned on at the same time, alternately, or successively; by controlling the ozone disinfection duration, ultraviolet disinfection duration, and cycle drive device in the first working mode The duration of driving water circulation is to circulate the water in the pipeline to ensure that the microorganisms in the water output by the water intake device are lower than the warning value and the ozone by-product bromate is lower than the warning value to avoid secondary pollution of the pipeline. By rationally allocating ozone disinfection and ultraviolet The duration of disinfection makes full use of the advantages of ultraviolet disinfection without by-products under low water consumption, and avoids the problem of ozone accumulation and decomposition to produce oxides that allow microorganisms to breed again. At the same time, it greatly reduces the cost of disinfection; when the frequency of water use is high, At the preset value, the second working mode is turned on, and the circulation processing device is closed. At this time, the residence time of direct drinking water in the pipeline is very short; according to this pipeline secondary pollution treatment method, the pipeline direct drinking water system can match the water consumption in the application environment and Water usage habits, according to the working mode of low-peak water use and peak water use, selectively turn on circulation processing and disinfection processing, control at a lower cost and solve the problem of excessive microorganisms and excessive ozone in water caused by secondary pollution of pipelines The resulting problem of bromate exceeding the standard, the difficulty of matching water consumption for ultraviolet disinfection, and the high cost caused by keeping the circulation drive device open.

Wherein, when the first working mode and the second working mode are respectively set according to the water use frequency of users in the target area, the processing method specifically includes: when the water use rate is lower than the preset value for more than the fourth preset time period, the first working mode is turned on. When the water use rate is higher than the preset value, the second working mode is turned on; the fourth preset time period is set according to changes in water quality in different application environments. Based on this, the fourth preset time period is approximately the first preset period. In this embodiment Taking 2 hours as an example, within the fourth preset time period, the water quality can be guaranteed to meet the requirements. If the water use rate is higher than the preset value, the water stored in the water supply pipe will be basically discharged; if the water use rate is lower than the preset value or there is no water If the fourth preset time is exceeded, the water in the pipeline will be stored for a long time and the water quality will be reduced to the level that does not meet the requirements of direct drinking water. The first working mode will be turned on to perform circulation and disinfection to ensure water quality; further, the fourth preset time can still be used. Calculation based on real-time changes in water use rate, that is, calculating the water storage time in the pipeline based on the amount of water that can be stored in the water supply pipeline, water use rate and time in the application environment, ensuring that the accumulation time of water in the pipeline does not exceed the fourth preset time;

In this embodiment, the second preset duration and the third preset duration are set in a preset ratio. For example, in this embodiment, the second preset duration and the third preset duration are preferably set to 1:0.5-1:2. The water quality of the two disinfection methods combined under the proportion range is better; and, ozone disinfection and ultraviolet disinfection are preferably turned on at intervals, and ultraviolet disinfection is performed after ozone disinfection, then the first preset time period is the second preset time period and the third preset time period. Assuming the sum of the time lengths, under the ratio setting conditions and interval opening conditions, the disinfection capabilities of the two disinfection methods are fully utilized, while ensuring that microorganisms and disinfection by-products in the water do not exceed standards; in some embodiments, ozone and ultraviolet can also be turned on at the same time , or some opening times overlap. In this case, the first preset duration is the sum of the second preset duration to the second preset duration and the third preset duration;

Specifically, the first preset period of this embodiment is 0.5-3h, the second preset time period is 0.01-0.6h, and the third preset time period is 0.1-0.6h. It can be understood that the second preset time period varies with The period length of the first preset period increases as the period length increases, and the third preset period increases as the period length of the first preset period increases.

In this embodiment, the pipeline direct drinking water system is also equipped with a dosing device connected to the water storage device. Based on this, the processing method includes:

Every second preset period, the control system controls the dosing device to put a preset amount of disinfectant into the water storage device, and the control system controls the circulation drive device to work so that the water in the pipeline direct drinking water system circulates in the pipeline direct drinking water system. Assume time; specifically, the second preset period can be half a year, a quarter, or a month. In this embodiment, it is applied in a campus environment and takes half a year as an example. Within one week before the start of school, the water supply pipeline and circulation pipeline are inspected. During cleaning, all water intake devices are closed and stopped from use. The dosing device puts a preset amount of disinfectant into the water storage device (for example, 10 effervescent tablets per 100L) to form a disinfectant. The cyclic driving device works to make it circulate in the pipeline. Circular flow realizes pipeline cleaning. After 2 hours of circulation, the circulation drive device is turned off and the disinfectant is allowed to soak in the pipeline for more than 24 hours;

The control system controls the circulation drive device to work so that the water in the pipeline direct drinking water system circulates in the pipeline direct drinking water system for a preset time. The processing method also includes:

Open the water intake device and release the water in the pipeline direct drinking water system; that is, after soaking for more than 24 hours, open the water outlet of the water intake device, release all the disinfectant in the water intake device and the disinfectant in the pipeline, and then close it, that is, the amount of water released should be Greater than the water storage capacity of the water storage device; start water production, open the water outlet of the water intake device to allow water to be output for the preset time until clean water flows out, close the water outlet of the water intake device, and complete cleaning.

It should be understood that this treatment method is applied to the aforementioned pipeline direct drinking water system, and is implemented by the pipeline direct drinking water system control system respectively controlling the circulation drive device and the circulation treatment device.

Example 1

As shown in Figure 2, the small-scale pipeline direct drinking water system of this embodiment is applied to a teaching building. The water production system 100, the control system, the water storage device, the circulation processing device and the circulation driving device are all installed in the machine room on the top floor. A wall-mounted water dispenser is installed next to the door of each classroom. The water production system 100 is connected to each water dispenser by a water supply pipe 9. The circulation pipe 11 is connected to the water production system 100 and is connected to the water supply pipe 9 close to each water dispenser.

The campus environment of this embodiment takes the total number of teachers and students in the target teaching building as 500 as an example. The capacity of the matching water storage device is 600L; the power of ultraviolet disinfection is 20W, and the ozone generator is set to have a working power of 15W, that is, the concentration of ozone disinfection is 0.5g/h; it should be understood that the above parameter setting conditions can disinfect water under normal use; the first preset period is 2h, the first preset time is 1h, the second preset time is 0.5h, and the The third preset time is 0.5h; the water sample test results of this embodiment are: chlorate <0.050, bromate <0.005, chlorite <0.050, microbial content 0, E. coli test negative, water quality meets requirements.

Comparative example 1

In this comparative example, the existing pipeline direct drinking water system was used, ozone disinfection was turned off, and ultraviolet disinfection was turned on for 10 hours. The water sample detection results were: chlorate 0.239, bromate <0.005, and chlorite <0.050.

Comparative example 2

In this comparative example, the existing pipeline direct drinking water system was used, ozone disinfection was turned off, and ultraviolet disinfection was turned on for 24 hours. The water sample detection results were: chlorate 0.254, bromate <0.005, and chlorite <0.050.

Comparative example 3

In this embodiment, the existing pipeline direct drinking water system is used, the ultraviolet disinfection is turned off, and the ozone disinfection is turned on for 10 hours. The water sample detection results are: chlorate <0.050, bromate <0.005, and chlorite <0.050.

Comparative example 4

In this embodiment, the existing pipeline direct drinking water system is used, the ultraviolet disinfection is turned off, and the ozone disinfection is turned on for 24 hours. The water sample detection results are: chlorate <0.050, bromate <0.005, and chlorite <0.050.

Comparative example 5

In this embodiment, the existing pipeline direct drinking water system is used, and ultraviolet disinfection and ozone disinfection are turned on at the same time for 10 hours. The water sample detection results are: chlorate 0.057, bromate <0.005, and chlorite <0.050.

Comparative example 6

In this embodiment, the existing pipeline direct drinking water system is used, and ultraviolet disinfection and ozone disinfection are turned on for 24 hours at the same time. The water sample detection results are: chlorate <0.050, bromate <0.005, and chlorite <0.050.

Comparative example 7

In this embodiment, the existing pipeline direct drinking water system is used, and ultraviolet disinfection and ozone disinfection are turned on for 5 hours at the same time. The water sample detection results are: chlorate <0.050, bromate <0.005, chlorite <0.050, microorganism The content is 151, and the E. coli test is negative;

In this embodiment, the existing pipeline direct drinking water system is used, and ultraviolet disinfection and ozone disinfection are turned on for 5 hours at the same time. The water sample detection results are: chlorate <0.050, bromate <0.005, chlorite <0.050, microorganism The content is 335, and the E. coli test is negative.

Comparative example 8

In this embodiment, the existing pipeline direct drinking water system is used, the ultraviolet disinfection is turned off, and the ozone disinfection is turned on for 5 hours. The water sample detection results are: chlorate 0.272, bromate <0.005, chlorite <0.050, microbial content 8. The E. coli test is negative.

Comparative example 9

In this embodiment, the existing pipeline direct drinking water system is used, the ultraviolet disinfection is turned off, and the ozone disinfection is turned on for 5 hours. The water sample detection results are: chlorate 0.272, bromate <0.005, chlorite <0.050, microbial content 21. The E. coli test was negative.

Comparative example 10

In this embodiment, the existing pipeline direct drinking water system is used. After the water in a certain water production host is disinfected for the first time, ozone disinfection is turned on for 99 seconds every hour and repeated 5 times. The water sample test result is: chlorate <0.050, bromate <0.005, chlorite <0.050, microbial content 1, E. coli test negative.

Comparative example 11

In this embodiment, the piped direct drinking water system in the prior art is used. After the water in a certain water production host is disinfected for the first time, ozone disinfection is turned on for 99 seconds every hour, and ultraviolet disinfection is kept turned on. This is repeated 5 times, and the water sample is detected. Results: chlorate 0.068, bromate <0.005, chlorite <0.050, microbial content 0, E. coli test negative.

Comparative example 12

In this embodiment, the existing pipeline direct drinking water system is used. After the water in a certain water production host is disinfected for the first time, ozone disinfection is turned on for 99 seconds every hour and repeated 5 times. The water sample test result is: chlorate <0.050, bromate <0.005, chlorite <0.050, microbial content 0, E. coli test negative.

It is obvious from the above comparison examples that using the existing pipeline direct drinking water system and controlling the proportion of ozone disinfection can basically ensure that the by-product bromate does not exceed the standard. However, ozone is easily decomposed and unstable, and only 5 hours of The long use time will lead to a higher microbial content in the direct drinking water in the water tank. Although turning on ozone disinfection and ultraviolet disinfection for 5 hours at the same time reduces the microbial content to a certain extent, microbial growth still exists. That is, under long-term use, the water quality will inevitably fail to meet the standards. The direct drinking water system and treatment method according to the preferred embodiment of the present invention controls the opening of ozone disinfection and ultraviolet disinfection, which effectively suppresses the problem of excessive microorganisms and excessive bromate in water caused by secondary pollution of pipelines and excessive ozone concentration. It also avoids the difficulty of matching ultraviolet disinfection with large water consumption and the high cost problem caused by keeping the circulation drive device open, ensuring the disinfection effect while reducing system operating costs.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A method for treating secondary pollution of pipeline direct drinking water, which is used in a pipeline direct drinking water system. It is characterized in that the pipeline direct drinking water system includes a water production system, a circulating water supply system and a control system. The circulating water supply system includes a circulating driving device, A circulation treatment device, a water storage device connected to the water production system, and a water intake device installed at each target water supply position. The water intake device is connected to the water storage device through a water supply pipe, and the circulation drive device is used to extract water in the water supply pipe through the circulation pipe to the circulation Treatment device purification treatment, the treatment method includes: Set the first working mode and the second working mode respectively according to the water use frequency of users in the target area, In the first working mode, the circulation drive device turns on the first preset time period every first preset period, and the circulation processing device performs ozone disinfection for the second preset time period and ultraviolet disinfection for the third preset time period every first preset period. , the time starting point of the first preset duration is the same as the time starting point of the first preset period; the time starting point of the second preset duration is the same as the time starting point of the first preset period, and/or The time starting point of the third preset period is the same as the time point of the first preset period; the second preset period and the third preset period overlap or overlap within the first preset period. Distributed alternately or at intervals; In the second operating mode, the circulation drive is switched off. 2. The secondary pollution treatment method of pipeline direct drinking water according to claim 1, characterized in that the second preset time length and the third preset time length are set in a preset ratio. 3. The secondary pollution treatment method of pipeline direct drinking water according to claim 2, characterized in that the first preset period is 0.5-3h, the second preset time is 0.01-0.6h; the third preset time is 0.1 -0.6h. 4. The secondary pollution treatment method of pipeline direct drinking water according to claim 1, characterized in that when the first working mode and the second working mode are respectively set according to the water use frequency of users in the target area, the processing method also includes: When the water use rate is lower than the preset value for more than the fourth preset time period, the first working mode is turned on. When the water use rate is higher than the preset value, the second working mode is turned on. 5. The secondary pollution treatment method of pipeline direct drinking water according to claim 1, characterized in that the pipeline direct drinking water system is provided with a dosing device connected to the water storage device, and the treatment method includes: Every second preset period, the control system controls the dosing device to put a preset amount of disinfectant into the water storage device, and the control system controls the circulation drive device to work so that the water in the pipeline direct drinking water system is in the water storage device. The preset time for circulation in the piped drinking water system. 6. The secondary pollution treatment method of pipeline direct drinking water according to claim 5, characterized in that the control system controls the circulation driving device to work so that the water in the pipeline direct drinking water system circulates and flows in the pipeline direct drinking water system. After the set time, the treatment method also includes: opening the water intake device and releasing the water in the pipeline direct drinking water system. 7. The secondary pollution treatment method of pipeline direct drinking water according to claim 1, characterized in that the treatment method further includes: first preset duration * circulation drive device flow rate ≥ water supply pipeline storage volume. 8. The secondary pollution treatment method of pipeline direct drinking water according to any one of claims 1 to 6, characterized in that the water storage capacity of the water storage device matches the water consumption of the target area, and 500-700L is matched for every 500 people. Water storage devices with water storage capacity of 900-1100L per 1,000 people. 9. The secondary pollution treatment method of pipeline direct drinking water according to claim 8, characterized in that the power of the ultraviolet disinfection matched with a 500-700L water storage device is 20W, and the power of the UV disinfection matched with a 900-1100L water storage device is The power of ultraviolet disinfection is 40W; the concentration of ozone disinfection matched with a water storage device of 500-700L is 0.5g/h; the concentration of ozone disinfection matched with a water storage device of 900-1100L is 1g/h. 10. A pipeline direct drinking water system, characterized by applying the pipeline direct drinking water secondary pollution treatment method described in any one of claims 1 to 9.