CN114920340B - Ozone disinfection control method and system for large-scale pipeline direct drinking water system - Google Patents

Ozone disinfection control method and system for large-scale pipeline direct drinking water system Download PDF

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CN114920340B
CN114920340B CN202210712522.9A CN202210712522A CN114920340B CN 114920340 B CN114920340 B CN 114920340B CN 202210712522 A CN202210712522 A CN 202210712522A CN 114920340 B CN114920340 B CN 114920340B
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water
ozone
disinfection
pipe network
time
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CN114920340A (en
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李苗
陈畅
郑元贵
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Shenzhen Kangji Hengye Technology Co ltd
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Shenzhen Kangji Hengye Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
    • G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/44—Time
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/14—Treatment of water in water supply networks, e.g. to prevent bacterial growth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/152—Water filtration

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The invention discloses an ozone disinfection control method and system for a large-scale pipeline direct drinking water system in an office building park, wherein the method comprises the following steps: water making and disinfecting steps: after the water making work is started, synchronously controlling the ozone generator to work, and synchronously adding ozone into a water purifying tank of a direct drinking water system; attenuation judging step: continuous monitoring of ozone decay time dynamic parameter To 3 Judging whether the current value exceeds a preset upper limit value or not; a pipe network disinfection step: starting water circulation in a pipe network, and synchronously adding ozone into a water purifying tank; a timed disinfection step: starting the timing cycle disinfection work, and synchronously adding ozone into the water purifying tank. And (4) after the disinfection is finished, entering an ozone attenuation judgment step. The invention aims at large office building parks, accurately controls the ozone throwing time and the ozone throwing amount based on dynamic water using scenes and the actual operation working conditions of the system, and can effectively ensure the sterilization and disinfection effect and the water quality safety of a direct drinking water system under various complex and dynamic water using scenes of the parks.

Description

Ozone disinfection control method and system for large-scale pipeline direct drinking water system
Technical Field
The invention relates to the technical field of direct drinking water in office building parks, in particular to an ozone disinfection control method and system for a large-scale pipeline direct drinking water system.
Background
Ozone disinfection is the inactivation of microorganisms by the destruction of their cell wall surface components by the strong oxidative action of ozone. Ozone has wide application in the direct drinking water industry. The general process of the ozone disinfection process comprises the following steps: ozone is squeezed into the water purifying tank, the ozone and the water are fully mixed, the water purifying tank is enabled to keep certain solubility in the water, then the water supplying pump is used for entering a water supplying pipe network, and the ozone can keep certain residual quantity in the pipe network, so that the effects of continuous disinfection and bacteriostasis are achieved.
In the figure 1, the ozone adding mode of the ejector and the ozone circulating pump is a typical ozone adding process which is used most. FIG. 2 shows the ozone adding mode of a gas-liquid mixing pump, and FIG. 3 shows the ozone adding mode of an aeration device.
The existing ozone generator and the ozone circulating pump are configured according to the convention. The selection of the adding time point and the disinfection duration are generally set roughly according to experience, and no algorithm standard based on the quantification of a dynamic water use scene and an actual operation condition exists. Ozone adding is generally started at a fixed time point every day, and the disinfection duration is also set at will.
The existing ozone adding method has the following problems:
1. the selection of the ozone adding time point is very rough and random, a timed adding mode is generally adopted, and quantifiable program standards and calculation methods based on dynamic water use scenes and actual operation conditions do not exist. For various changing water use scenes, the disinfection effect and the water quality safety cannot be ensured.
2. No water supply turnaround time factor due to water supply network capacity was calculated. To ensure the continuous effect of ozone disinfection from the machine room to the end of the pipe network, the pipe capacity must be taken into account for large pipe direct drinking water systems that cover many buildings. The half-life of ozone is short, and the bacteriostatic ability decay of the ozone residual quantity is very fast in the pipe network, consequently, to long distance large-scale pipe network system, the turnaround time of water supply pipe can not neglect.
3. For a large office building park, the water use scene is very complicated. The curve change of the average water consumption generated by the personnel staying in progress and the water consumption in each time interval have very obvious difference, and if the water is added according to a uniform fixed time point, the disinfection effect cannot be ensured.
4. The time length of single disinfection is randomly and roughly set, and a quantitative algorithm based on a dynamic water use scene and the actual operation condition of the system is lacked. Specifications of an ozone generator, an ozone circulating pump and the like are also configured conventionally, and no calculation standard exists.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an ozone disinfection control method and system for a large-scale pipeline direct drinking water system, so that the disinfection effect and the water quality safety of the direct drinking water system can be effectively guaranteed.
In order to solve the above technical problems, an embodiment of the present invention provides an ozone disinfection control method for a large-sized pipeline direct drinking water system, where the large-sized pipeline direct drinking water system includes a purified water tank for producing water, a long-distance water supply network for communicating the purified water tank, and an ozone generator for supplying ozone to the purified water tank, and the ozone disinfection control method includes:
water making and disinfecting steps: after the water making work of the direct drinking water system is started, synchronously controlling the ozone generator to work according to the water making duration of the direct drinking water system, and synchronously adding ozone into a purified water tank of the direct drinking water system, wherein the ozone adding time = the water making time; after the water making is stopped, timing is started, and the attenuation judging step is carried out;
attenuation judging step: continuous monitoring of ozone decay time To 3 Judging whether the water making operation exceeds a preset upper limit value or not, if not, judging whether the water making operation is started or not, if so, entering a water making disinfection step, and if not, continuing timing; if yes, judging whether the current time is a non-water-use time interval, if not, entering a pipe network disinfection step, and if the current time is the non-water-use time interval, entering a timing disinfection step;
a pipe network disinfection step: starting water circulation in a pipe network of the direct drinking water system, reading the current liquid level of the water purifying tank, adding the data of the total capacity of the pipe network system, synchronously controlling the ozone generator to work, synchronously adding ozone into the water purifying tank, starting timing after the addition is finished, and entering an attenuation judging step;
a timed disinfection step: starting the timed circulating disinfection work, judging whether the current time reaches the set time, if so, reading the current liquid level of the water purification tank, adding the data of the total capacity of the pipe network system, controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and entering the attenuation judging step.
Further, in the step of water making and disinfection, the gas production O of the ozone generator c Satisfies the following formula:
O c = （ V j * ρ）÷ S ÷ T z ；
wherein, V j Rho is the preset target concentration of ozone addition, the solubility of S ozone in a water purifying tank, and T is the water volume of the produced water z The water making time is the water making time.
Further, in the step of disinfecting the pipe network, the current liquid level of the water purification tank is read firstly, the data of the total capacity of the pipe network system are added, then the water body in the pipe network is controlled to circulate, and simultaneously ozone is synchronously added into the water purification tank, and the ozone adding time T is r1 Satisfies the following formula:
T r1 = k *（ V j * ρ）÷ S ÷ O c ；
wherein k = (V) r1 + C）/V j ，V r1 For the water yield in the water purification case that current liquid level corresponds, C is the total capacity of whole pipe network system's water, and pipe network system includes water supply network and return water pipe network.
Further, in the timed sterilizing step, ozone is added for a time T r2 Satisfies the following formula:
T r2 = k *（ V j * ρ）÷ S ÷ O c 。
wherein k = (V) r2 + C）/V j ，V r2 The water quantity in the purified water tank corresponding to the current liquid level.
Further, the turnover time T of the pipe network L Satisfies the following conditions: t is L = T 0 ÷ （V j ÷ C j ）；
Wherein, T 0 For the interval of water production, C j The capacity of the water supply network.
Further, ozone decay time To 3 = disinfection interval time + pipe network turnaround time.
Furthermore, the large-scale pipeline direct drinking water system adopts the water body in the circulating water purification tank of the ozone circulating pump to dissolve the ozone in the water, and the rated flow Q of the ozone circulating pump x Satisfies the following formula:
Q x =V j ÷ T z 。
and further, in the pipe network disinfection step, in the ozone adding process, if the water making is started, the water making disinfection step is carried out, and meanwhile, the pipe network circulation is continued until the circulation is completed for one time, so that the water body in the pipe network is completely recovered and disinfected.
Correspondingly, the embodiment of the invention also provides an ozone disinfection control system of a large-scale pipeline direct drinking water system, the large-scale pipeline direct drinking water system comprises a water purification tank for water production, a long-distance water supply network for communicating the water purification tank and an ozone generator for putting ozone into the water purification tank, and the ozone disinfection control system comprises:
the water making and sterilizing module: after the water making work of the direct drinking water system is started, synchronously controlling the ozone generator to work according to the water making duration of the direct drinking water system, and synchronously adding ozone into a purified water tank of the direct drinking water system, wherein the ozone adding time = the water making time; after the water making is stopped, timing is started and is executed by the attenuation judging module;
an attenuation judgment module: continuous monitoring of ozone decay time To 3 Judging whether the water making operation exceeds a preset upper limit value or not, if not, judging whether the water making operation is started or not, if so, executing the water making operation by a water making disinfection module, and if not, continuing timing; if yes, judging whether the current time is a non-water time period, if not, executing the time by a pipe network disinfection module, and if so, executing the time by a timing disinfection module;
pipe network disinfection module: starting water circulation in a pipe network of the direct drinking water system, reading the current liquid level of the water purification tank, adding data of the total capacity of the pipe network system, synchronously controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and executing by the attenuation judging module;
a timing disinfection module: starting the timed circulating disinfection work, judging whether the current time reaches the set time, if so, reading the current liquid level of the water purification tank, adding the data of the total capacity of the pipe network system, controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and executing by the attenuation judging module.
Further, in the water making and sterilizing module, the gas production O of the ozone generator c Satisfies the following formula:
O c = （ V j * ρ）÷ S ÷ T z ；
wherein, V j Rho is the preset target concentration of ozone addition, the solubility of S ozone in the water purifying tank, and T is the water volume for water making z The water making time is the water making time.
The invention has the beneficial effects that: the invention aims at a large office building park, accurately controls the ozone throwing time and the ozone throwing amount based on dynamic water using scenes and the actual operation working conditions of the system, and can effectively ensure the sterilization and disinfection effects and the water quality safety of a direct drinking water system under various complex and dynamic water using scenes of the park for long-distance large-pipeline direct drinking water system projects (a system with larger scale of a pipe network covering a plurality of office buildings).
Drawings
FIG. 1 is a schematic structural diagram of a large-scale pipeline direct drinking water system adopting an ozone adding mode of an existing ejector and an ozone circulating pump.
FIG. 2 is a schematic structural diagram of a large-scale pipeline direct drinking water system adopting an ozone adding mode of an air-liquid mixing pump in the prior art.
FIG. 3 is a schematic structural diagram of a large-scale pipeline direct drinking water system adopting an ozone adding mode of aeration of an aeration device in the prior art.
Fig. 4 is a schematic diagram of the capacity calculation of the fresh water tank of a large pipe-direct drinking water system.
FIG. 5 is a flow chart of an ozone disinfection control method of a large-scale direct drinking water pipeline system according to an embodiment of the invention.
Fig. 6 is a schematic flow chart of the disinfection step of the pipe network according to the embodiment of the invention.
FIG. 7 is a schematic flow chart of the timed sanitization step of an embodiment of the present invention.
FIG. 8 is a schematic flow chart of the embodiment of the invention during normal daytime water use.
FIG. 9 is a schematic flow diagram of a pipeline during the circulation disinfection of the pipeline network according to the embodiment of the invention.
Fig. 10 is a schematic flow section of the embodiment of the invention for circulating disinfection in a timing pipe network.
FIG. 11 is a diagram of the operation of the embodiment of the present invention during normal water use during the day.
FIG. 12 is a diagram of the operation of the embodiment of the invention during the circulation sterilization of the pipe network.
FIG. 13 is a schematic view of the embodiment of the present invention in a timing mode for cyclic disinfection of the pipe network.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 to 3 show several currently mainstream ozone adding process modes, each process has different ozone solubility empirical values. The data of ozone solubility can be actually measured in the debugging stage of the direct drinking water system according to the specific model selection difference. The invention has no limitation to the selection of the processes, and can be suitable for direct drinking water systems of various ozone adding processes. The method is applicable to the ozone solubility which is uniformly expressed by S and different S values.
Referring to fig. 5 to 7, the ozone disinfection control method of the large-scale pipeline direct drinking water system of the embodiment of the invention includes:
water making and disinfecting steps: after the water making work of the direct drinking water system is started, synchronously controlling the ozone generator to work according to the water making duration of the direct drinking water system, and synchronously adding ozone into a purified water tank of the direct drinking water system, wherein the ozone adding time = the water making time; after the water making is stopped, timing is started, and the attenuation judging step is carried out;
attenuation judging step: continuous monitoring of ozone decay time dynamic parameter To 3 Judging whether the water making operation exceeds a preset upper limit value or not, if not, judging whether the water making operation is started or not, if so, entering a water making disinfection step, and if not, continuing timing; if yes, judging whether the current time is a non-water-use time interval, if not, entering a pipe network disinfection step, and if the current time is the non-water-use time interval, entering a timing disinfection step;
a pipe network disinfection step: starting water circulation in a pipe network of a direct drinking water system, reading the current liquid level of a water purification tank, adding data of the total capacity of the pipe network system, synchronously controlling an ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and entering an attenuation judging step;
a timing disinfection step: starting the timed circulating disinfection work, judging whether the current time reaches the set time, if so, reading the current liquid level of the water purification tank, adding the data of the total capacity of the pipe network system, controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and entering the attenuation judging step.
The ozone disinfection control method of the large-scale pipeline direct drinking water system needs to relate to two algorithms, namely a water making state disinfection algorithm in the water making disinfection step and a pipe network circulation state disinfection algorithm in the pipe network disinfection step, which are respectively marked as an algorithm 1 and an algorithm 2.
Algorithm 1-water making state disinfection algorithm
1. The target concentration rho (unit: ppm or mg/L) of ozone addition is set, and the target concentration rho is generally more than or equal to 0.3mg/L.
2. In order to achieve the best mixing effect, the ozone adding time and the water making time are synchronous.
3. The basic data are listed:
volume of water volume starting for primary water production, i.e. from a low level (starting water production) to a high level (full state), marked V j (unit: m) 3 ）；
Time of water production, marked T z (unit: hour);
the specification of the gas production of the ozone generator is marked as O c (unit g/h); the specifications of the ozone generator are classified according to the amount of ozone to be generated. The unit of ozone output commonly used is mg/h, g/h, kg/h (mg/h, g/h, kg/h), that is, how many weight units of ozone gas can be generated by 1 hour of the ozone generator working;
specification of ozone circulating pump, rated flow Q x (unit m) 3 /h）；
After mixing of the gas and the liquid, the solubility S of the ozone in the water purification tank is dimensionless.
4. Calculating the time of the ozone generator needing to work when the target concentration of the added ozone is reached, and recording the time as T c (unit: hour).
Working time of ozone generator =
(water production volume target concentration) ÷ solubility ÷ generator ozone gas production specification
T c = （ V j * ρ）÷ S ÷ O c （1）
Engineering examples are as follows:
a certain system, V j =4.0m 3 、 ρ=0.3 ppm 、 s=10% 、O c =10.0g/h
T c =（V j * ρ）÷ S ÷ O c
=（4000L * 0.3mg/L）÷ 10% ÷ 10000mg/h
= 1.2 h (unit: hour)
Namely: the ozone generator was operated for 1.2 hours to achieve the ozone production required for the target concentration.
5. In order to achieve the best mixing effect, the ozone adding time and the water making time are synchronized, so that the method comprises the following steps:
T c = T z
namely: (V) j * ρ）÷ S ÷ O c = T z （2）
Obtaining: o is c = （ V j * ρ）÷ S ÷ T z （3）
The formula is also used as the basis for the specification and the model selection of the gas production amount of the ozone generator.
6. And (3) selecting the rated flow of the ozone circulating pump:
in the ozone adding time, the ozone circulating pump just leads the water yield V j And (5) circulating once.
Namely: q x * T z =V j （4）
Then: q x =V j ÷ T z （5）
The formula is also used as the basis for the model selection of the rated flow of the ozone circulating pump.
The water body just circulates once within the ozone adding time, so that the gas and the liquid are mixed more uniformly.
The ozone adding time and the water making time are synchronous, which is equivalent to that the new water making quantity is completely disinfected once, thereby achieving the optimal effect in engineering.
The ozone circulating pump generally runs at power frequency without a frequency converter.
Algorithm 2-pipe network circulation state disinfection algorithm
When the pipe network circulation disinfection starts, the liquid level in the water purification tank is at any height, and meanwhile, the water in the pipe network also needs to be recycled for disinfection once. Algorithm 2 defines a control method for ozone disinfection of the total water volume of the sum of the volume of any liquid level in the clean water tank and the volume of the pipe network.
In the front, the algorithm 1 is an ozone adding algorithm under the water making working condition. Based on the above, the ozone control algorithm for circulating disinfection of the pipe network under any liquid level of the water purification tank comprises the following steps:
as shown in FIG. 4, the water volume corresponding to any liquid level of the purified water tank is marked as V r And the ozone adding time is recorded as T r 。
1. According to the actual liquid level height of the purified water tank, the volume V of the water quantity of the corresponding purified water tank is obtained r
2. And the volume of the pipe network is marked as C. C is the total capacity of the whole pipe network system, and comprises a water supply pipe network and a water return pipe network.
3. Calculating V r Total volume of C, denoted as V r+c
V r+C = V r + C （6）
4. Calculating v r+C /v j Is denoted by k
5. Adding time T r = k * T c = k *（ V j * ρ）÷ S ÷ O c （7）
6. The PLC controls the working time of the ozone generator and the working time of the ozone circulating pump to be T r
Above, the ozone disinfection method and the adding parameters of the full water level and any water level are respectively determined.
Next, under various complex water using scenes, a control mechanism of a disinfection time point is determined according to the actual operation condition of the direct drinking water system.
The invention needs to establish that: the ozone adding window is divided into three:
(1) Adding during water making: the low level of the clean water tank to full level corresponds to algorithm 1.
(2) And (3) timed addition: the clean water tank is at any level, corresponding to algorithm 2.
(3) Adding in the circulating process of the pipe network: the clean water tank is at any level, corresponding to algorithm 2.
Various parameters are defined:
volume of initial water generation, denoted as V j (unit: m) 3 ）
Interval of water production, denoted T 0 ( The time interval from water making stop to water making start next time, unit: hour(s) )
Estimated capacity of the water supply network, marked C j (unit: m) 3 ）
Description of the drawings: c j Only the capacity of the water supply pipe network is calculated, and the water return pipe network is not counted.
At the interval of water production (T) 0 ) And the flowing times of the water body in the water supply pipe network are as follows:
V j ÷ C j （T 0 time) (8)
Then: primary water producing capacity V j Time to flow once in the pipe network:
T 0 ÷ （V j ÷ C j ) (unit: hour) (9)
The above formula is the turnover time of the pipe network, and is recorded as T L (unit: hour)
T L = T 0 ÷ （V j ÷ C j ） （10）
Engineering examples are as follows:
a certain system, V j = 2.0m 3 、T 0 =3 hours, C j = 1.0m 3
Then: v j ÷ C j = 2.0÷1.0=2
Pipe network turnaround time T L = T 0 ÷（V j ÷ C j ) =3 ÷ 2 = 1.5 hours.
The half-life of ozone is very short, to the pipe network apart from long large-scale pipeline direct drinking water system, the influence of pipe network turnover time to ozone disinfection effect can not be ignored.
Formula (10) is directly expressed as:
T L = T 0 * C j / V j （11）
V j the high and low level values of the water tank set by the PLC determine, once set, V j Is a constant value.
Fixed V j After a value of T 0 Which reflects the water consumption.
Above, T L It is determined by two parameters: t is 0 And C j Namely: the larger the average water making time interval is, the larger the pipe network capacity is, the longer the pipe network turnover time is. Or:
the smaller the water consumption and the larger the pipe network capacity, the longer the pipe network turnover time.
For the direct drinking water system of an office building park and a large-scale pipeline, a plurality of people are involved, a plurality of drinking water points are involved, the second flow design value of a water supply pipeline is large, the pipe diameter is large, and the pipe network is large and long in distance, so that the capacity of the pipe network cannot be ignored, and the turnover time of the pipe network must be considered.
Thus, the following are defined: ozone decay time To 3 There are two calculation methods:
To 3 =T 0 +T L （12）
in this formula, ozone decay time = interval between water production + pipe network turnaround time
Or:
To 3 =T+T L （13）
t represents the actual timing started after the cyclic disinfection of the pipe network is finished.
In this formula, ozone decay time = pipe network circulation disinfection end time + pipe network turnover time
(12) The formula (13) can be uniformly expressed as:
ozone decay time = disinfection interval time + pipe network turnaround time
Substituting equation (11) into equation (12) includes:
To 3 = T 0 + T 0 * C j / V j = T 0 *（1+ C j / V j ） （14）
the above formula can also be seen, and for long-distance large-scale pipeline direct drinking water system and office building park system, the water supply network capacity C j Value of (D) relative to primary water making capacity V j The value of (c), the size of which cannot be ignored.
Defining: upper limit of ozone decay time T x I.e. the maximum time interval between two ozone sterilization starts. This limit is to ensure the water quality of the entire water supply network system.
General requirements T x = 6 (hours).
Due to the existence of the half-life of ozone (the half-life is generally 20 to 30 minutes), in order to inhibit the propagation of pipe network bacteria, the following requirements are provided:
To 3 ≤ T x that is, = 6 (hours):
T 0 *（1+ C j / V j ) Less than or equal to 6 (hours) (15)
The ozone disinfection control system of the large-scale pipeline direct drinking water system comprises:
the water making and sterilizing module: after the water making work of the direct drinking water system is started, synchronously controlling the ozone generator to work according to the water making duration of the direct drinking water system, and synchronously adding ozone into a purified water tank of the direct drinking water system, wherein the ozone adding time = the water making time; after the water making is stopped, timing is started and is executed by the attenuation judging module;
an attenuation judgment module: continuous monitoring of ozone decay time dynamic parameter To 3 Determine whether it exceeds the predetermined valueIf not, judging whether the water making work is started currently, if so, executing the water making disinfection module, and if not, continuing timing; if yes, judging whether the current time is a non-water-use time interval, if not, executing the time by the pipe network disinfection module, and if the current time is the non-water-use time interval, executing the time by the timing disinfection module;
pipe network disinfection module: starting water circulation in a pipe network of the direct drinking water system, reading the current liquid level of the water purification tank, adding data of the total capacity of the pipe network system, synchronously controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and executing by the attenuation judging module;
a timing disinfection module: starting the timed circulating disinfection work, judging whether the current time reaches the set time, if so, reading the current liquid level of the water purification tank, adding the data of the total capacity of the pipe network system, controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and executing by the attenuation judging module.
As an implementation mode, in the water making disinfection module, the gas production O of the ozone generator c Satisfies the following formula:
O c = （ V j * ρ）÷ S ÷ T z ；
wherein, V j Rho is the preset target concentration of ozone addition, the solubility of S ozone in the water purifying tank, and T is the water volume for water making z The water making time is the water making time.
As an implementation mode, in the pipe network disinfection module, the current liquid level of the water purification tank is read firstly, then the water body in the pipe network is controlled to circulate, simultaneously ozone is synchronously added into the water purification tank, and the ozone adding time T r1 Satisfies the following formula:
T r1 = k *（ V j * ρ）÷ S ÷ O c ；
wherein k = (V) r1 + C）/V j ，V r1 The water quantity in the water purification tank corresponding to the current liquid level and the C are the total water capacity of the whole pipe network system, and the pipe network system comprises a water supply pipe network and a water return pipe network.
As a kind of fruitThe mode of execution, in the timing disinfection module, the ozone adding time T r2 Satisfies the following formula:
T r2 = k *（ V j * ρ）÷ S ÷ O c 。
wherein k = (V) r2 + C）/V j ，V r2 The water quantity in the purified water tank corresponding to the current liquid level.
As an implementation, the turnaround time T of the pipe network L Satisfies the following conditions: t is L = T 0 ÷ （V j ÷ C j ）；
Wherein, T 0 For the interval of water production, C j The capacity of the water supply network.
As an embodiment, the ozone decay time To 3 And = disinfection interval time + pipe network turnaround time.
As an implementation mode, the large-pipeline direct drinking water system adopts an ozone circulating pump to circulate the water body in a water purifying tank so as to dissolve ozone in water, and the rated flow Q of the ozone circulating pump x Satisfies the following formula:
Q x =V j ÷ T z 。
as an implementation mode, in the process of adding ozone, if the pipe network disinfection module is started in case of water making, the pipe network disinfection module executes the water making disinfection, and meanwhile, the pipe network circulation is continued until the circulation is completed for one time, so that the water body in the pipe network is completely recovered and disinfected.
During the normal water using period in the daytime:
and continuously monitoring the water consumption and the time interval of the two times of disinfection, and determining the disinfection frequency and the working window by considering the influence factor of the turnover time of the pipe network. A threshold value is determined according to the water consumption and the turnover time of a pipe network. By monitoring this threshold, there are two decisions by the control logic:
1. no additional disinfection measures are needed except for the synchronous disinfection of the fresh water. This control logic is referred to as the main routine.
2. In order to guarantee the water quality of the pipe network, a pipe network circulating disinfection measure needs to be implemented. This control logic is called a pipe network circulation disinfection program in the water using period, namely a pipe network disinfection module.
During the night period of non-water use: and (4) executing the circulating disinfection program of the timing pipe network. It is called a non-water time period timing pipe network circulation disinfection program, namely a timing disinfection module.
The division of the water using time period and the non-water using time period is arranged in a PLC program, and can be flexibly determined according to the conditions of various parks and the combination of experience.
1. The flow chart of normal water consumption in daytime is shown in fig. 8, and the flow chart corresponds to a water consumption scene: normal water consumption in daytime and the number of people staying in the park reaches a certain scale (the water consumption turnover speed is higher), and the average water consumption and the ozone decay time To are adjusted 3 The monitoring of (2) is judged as: the disinfection is synchronously started during water making, and the circulating disinfection measures of the pipe network do not need to be additionally started.
Process K is To 3 Monitoring the process, and entering into the To-pair mode immediately after the water production is finished 3 And (4) monitoring to judge whether the residual quantity of ozone in the pipe network is enough to ensure the bacteriostatic effect. At this time, to 3 The description applies to formula (12), i.e.:
To 3 =T 0 +T L 。
2. and (3) a pipe network circulating disinfection program in a water using period:
by comparing the water consumption with the ozone decay time To 3 Monitoring of (2), determining the ozone decay time To 3 And (6) timing out.
The main reasons are as follows: the water consumption is small, and the water turnover speed is slow.
According to the following steps: to 3 = T 0 *（1+ C j / V j ）
C j And V j Is a fixed value, T 0 Excessive large causes To 3 The reason for overtime is that the water consumption is small.
Mainly occurs in the following water usage scenarios:
on weekends or holidays, the number of workers is small, and the using amount is small;
at the initial stage of park entrance, the number of persons who enter the park has a quite long climbing period, and the water consumption in the period is slowly increased.
Under the conditions, in order to ensure the water quality of the system, a pipe network disinfection step needs to be started.
Referring to fig. 9, the process M is a pipe network disinfection module, i.e. a subprogram of a pipe network circulation disinfection program. Process K is To 3 Monitoring process, i.e. entering To after the pipe network is disinfected circularly 3 Monitoring to ensure that the water quality is qualified. At this time, to 3 The description applies to formula (13), namely: to 3 =T+T L 。
3. Entering a timed disinfection step in a non-water period, namely a timed pipe network circulating disinfection program:
the period from night to morning is a non-water-using period, and the pipe network needs to be started to circularly disinfect at a proper time.
Referring to fig. 10, process N is a subroutine of a timed sterilization module, i.e., a timed network circulation sterilization process. Process K is To 3 Monitoring process, i.e. entering To the To immediately after the cyclic disinfection of the timing pipe network is finished 3 The monitoring is carried out to ensure that the water quality is qualified. At this time, to 3 The description applies to formula (13), namely: to 3 =T+T L 。
Description of subroutine M and subroutine N of the present invention:
for describing disinfection and water quality control mechanisms during periods of water use and periods of non-water use, respectively.
Both subprograms start the circulation and disinfection of the pipe network, wherein the ozone disinfection is based on the sum (V) of the actual capacity of the purified water tank and the system capacity of the whole pipe network r+C = V r + C) as the basis for the calculation of the ozone dosage.
Subroutine M, branch conditions to be considered during the loop disinfection of the network:
in operation, if water making is started, the process Z of the main program is skipped, namely the process of water making and disinfection are synchronously performed, but the circulation of the pipe network is continued until the circulation is completed for one time, so that the water body in the pipe network is completely recovered and disinfected.
In the non-water period, no water making window appears, and the process is normally completed according to the algorithm.
The water usage scenario for the operating conditions in FIG. 11:
normal water consumption in daytime and the number of people staying in the park reaches a certain scale by comparing the average water consumption with the ozone attenuation time To 3 The monitoring of (2) is judged as: the water making is synchronously started for disinfection, and no additional pipe network circulating disinfection measures need to be started.
The water usage scenario for the operating conditions in FIG. 12:
in the normal water using period, the water consumption is small, and the water consumption and the ozone decay time To are controlled 3 Monitoring of, determining ozone decay time To 3 And (6) timing out. In order to ensure the water quality safety of the system, a pipe network circulating disinfection program needs to be started.
Under this condition, to 3 There are two types of expression.
At the end of water production, to 3 Is described by the formula (12): to 3 =T 0 +T L
End of pipe network cycle To 3 Described by the formula (13): to 3 =T+T L 。
The water usage scenario corresponding to the working condition in fig. 13 is the pipe network circulation disinfection in the non-water-usage period, and in this working condition, T is 0 No initial value is given (a new one-day water using period, the water consumption needs to be monitored again), and T is the actual timing. At this time, to 3 Is described by the formula (13), namely: to 3 =T+T L 。
The abscissa in fig. 11 to 13 is a time axis.
The invention can be directly applied to the existing large-scale pipeline direct drinking water system, and can effectively ensure the sterilization and disinfection effect and water quality safety of the whole system under various complex and dynamic water using scenes of a park for long-distance large-scale pipeline direct drinking water system projects (a system with a large pipe network covering a plurality of office buildings).
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides an ozone disinfection control method of large-scale pipeline direct drinking water system, large-scale pipeline direct drinking water system is including the water purification case of making water, the long distance water supply network of intercommunication water purification case and to the ozone generator of water purification case input ozone which characterized in that includes:
water making and disinfecting steps: after the water making work of the direct drinking water system is started, synchronously controlling the ozone generator to work according to the water making duration of the direct drinking water system, and synchronously adding ozone into a purified water tank of the direct drinking water system, wherein the ozone adding time = the water making time; after the water making is stopped, timing is started, and the step of attenuation judgment is carried out;
attenuation judging step: continuous monitoring of ozone decay time To 3 Judging whether the water making operation exceeds a preset upper limit value or not, if not, judging whether the water making operation is started or not, if so, entering a water making disinfection step, and if not, continuing timing; if yes, judging whether the current time is a non-water time period, if not, entering a pipe network disinfection step, and if so, entering a timing disinfection step;
a pipe network disinfection step: starting water circulation in a pipe network of a direct drinking water system, reading the current liquid level of a purified water tank, adding data of the total capacity of the pipe network system, synchronously controlling an ozone generator to work, synchronously adding ozone into the purified water tank, starting timing after the addition is finished, and entering an attenuation judging step;
a timed disinfection step: starting the timed circulating disinfection work, judging whether the current time reaches the set time, if so, reading the current liquid level of the water purification tank, adding the data of the total capacity of the pipe network system, controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and entering the attenuation judging step.
2. The ozone disinfection control method for a large-scale pipeline direct drinking water system as claimed in claim 1, wherein in the step of water production disinfection, the gas production O of the ozone generator c Satisfies the following formula:
O c = （ V j * ρ）÷ S ÷ T z ；
wherein, V j Rho is the preset target concentration of ozone addition for the water making quantity, S is the solubility of ozone in the water purifying tank, and T is z The water making time is the water making time.
3. The ozone disinfection control method of a large-scale pipeline direct drinking water system as claimed in claim 2, wherein in the step of pipe network disinfection, the current liquid level of the clean water tank is read, the total capacity data of the pipe network system is added, then the water in the pipe network is controlled to circulate, simultaneously ozone is synchronously added into the clean water tank, and the ozone adding time T is r1 Satisfies the following formula:
T r1 = k *（ V j * ρ）÷ S ÷ O c ；
wherein k = (V) r1 + C）/V j ，V r1 The water quantity in the water purification tank corresponding to the current liquid level and the C are the total water capacity of the whole pipe network system, and the pipe network system comprises a water supply pipe network and a water return pipe network.
4. The ozone disinfection control method for a large-scale pipeline direct drinking water system as claimed in claim 3, wherein in the timed disinfection step, the ozone addition time T is r2 Satisfies the following formula:
T r2 = k *（ V j * ρ）÷ S ÷ O c ；
wherein k = (V) r2 + C）/V j ，V r2 The water quantity in the purified water tank corresponding to the current liquid level.
5. The ozone disinfection control method for large-scale pipeline direct-drinking water system as claimed in claim 3, wherein the turnover time T of the pipe network L Satisfies the following conditions: t is a unit of L = T 0 ÷（V j ÷ C j ）；
Wherein, T 0 For the time interval of water production, C j The capacity of a water supply network.
6. As in claimThe ozone disinfection control method for a large-scale direct drinking water system as set forth in claim 1, wherein the ozone decay time To 3 = disinfection interval time + pipe network turnaround time.
7. The ozone disinfection control method of a large-scale direct drinking water system according to claim 2, wherein the large-scale direct drinking water system uses an ozone circulating pump to circulate the water in the purified water tank so that the ozone is dissolved in the water, wherein the rated flow Q of the ozone circulating pump is x Satisfies the following formula:
Q x =V j ÷ T z 。
8. the ozone disinfection control method of a large-scale pipeline direct drinking water system as claimed in claim 1, wherein in the process of adding ozone, if starting with the water making, the step of water making disinfection is entered, and meanwhile, the pipe network circulation is continued until completing one circulation, so as to realize complete recovery and disinfection of the water body in the pipe network.
9. The utility model provides a drinking water system's ozone disinfection control system is directly drunk to large-scale pipeline, drinking water system is including the water purification case of making water, the long distance water supply network of intercommunication water purification case and to the ozone generator of water purification case input ozone which characterized in that includes:
the water making and sterilizing module: after the water making work of the direct drinking water system is started, synchronously controlling the ozone generator to work according to the water making duration of the direct drinking water system, and synchronously adding ozone into a purified water tank of the direct drinking water system, wherein the ozone adding time = the water making time; after the water making is stopped, timing is started and is executed by the attenuation judging module;
an attenuation judgment module: continuous monitoring of ozone decay time To 3 Judging whether the water making operation exceeds a preset upper limit value or not, if not, judging whether the water making operation is started or not, if so, executing the water making operation by a water making disinfection module, and if not, continuing timing; if yes, judging whether the current time is a non-water use time period, if not, executing the operation by a pipe network disinfection module,if the time is the non-water time period, the timed disinfection module executes the time;
pipe network disinfection module: starting water circulation in a pipe network of the direct drinking water system, reading the current liquid level of the water purifying tank, adding data of the total capacity of the pipe network system, synchronously controlling the ozone generator to work, synchronously adding ozone into the water purifying tank, starting timing after the addition is finished, and executing by the attenuation judging module;
a timing disinfection module: starting the timed circulating disinfection work, judging whether the current time reaches the set time, if so, reading the current liquid level of the water purification tank, then adding the data of the total capacity of the pipeline system, controlling the ozone generator to work, synchronously adding ozone into the water purification tank, starting timing after the addition is finished, and executing by the attenuation judging module.
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