CN119160981A - An intelligent water treatment method based on membrane separation - Google Patents
An intelligent water treatment method based on membrane separation Download PDFInfo
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- CN119160981A CN119160981A CN202411661034.5A CN202411661034A CN119160981A CN 119160981 A CN119160981 A CN 119160981A CN 202411661034 A CN202411661034 A CN 202411661034A CN 119160981 A CN119160981 A CN 119160981A
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- 239000012528 membrane Substances 0.000 title claims abstract description 172
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 238000000926 separation method Methods 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000012065 filter cake Substances 0.000 claims abstract description 139
- 238000001914 filtration Methods 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims description 6
- 239000002455 scale inhibitor Substances 0.000 abstract description 27
- 238000007781 pre-processing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 10
- 238000001223 reverse osmosis Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- 244000005700 microbiome Species 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000009288 screen filtration Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- -1 sulfamic acid compound Chemical class 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/167—Use of scale inhibitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/20—By influencing the flow
- B01D2321/2066—Pulsated flow
- B01D2321/2075—Ultrasonic treatment
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of water treatment, in particular to an intelligent water treatment method based on membrane separation, which comprises the steps of preprocessing discharged water to obtain secondary water, filtering the secondary water according to set water pressure, adjusting the water pressure at two sides of a separation membrane according to a thickness increasing value of a filter cake layer, detecting the thickness of the filter cake layer attached to the separation membrane to determine a descaling mode or increase the water pressure at two sides of the separation membrane when the thickness of the filter cake layer reaches a preset thickness value, wherein the descaling mode comprises ultrasonic descaling and adding membrane scale inhibitor descaling, calculating an ultrasonic power determining parameter to determine ultrasonic power when determining ultrasonic descaling, calculating an adding quantity determining parameter to determine the adding quantity of the membrane scale inhibitor when determining adding membrane scale inhibitor descaling, or calculating a water pressure determining parameter to determine the increased water pressure when determining increasing the water pressure at two sides of the separation membrane. The invention improves the filtering efficiency and prolongs the service life of the separation membrane.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to an intelligent water treatment method based on membrane separation.
Background
Currently, membrane technology has been widely used in the treatment of domestic sewage and industrial wastewater from power plants, oily wastewater, regenerated wastewater, etc. due to the advantages of high treatment efficiency, low resource consumption, etc. Membrane technologies are generally classified into low-pollution membranes, ultra-low pressure membranes, positively charged reverse osmosis membranes, and high temperature resistant food grade reverse osmosis membranes.
The permeable membrane vaporization separation technology is a membrane technology which is developed faster at present, is mainly used for treating petrochemical industry, medicines, power plant waste water and the like, is composed of a semipermeable membrane, drawing liquid and raw material liquid, is commonly used for treating industrial waste water, such as power plant desulfurization waste water, coal chemical waste water and the like, is used for isolating and treating impurities in the industrial waste water mainly through a filtering system, and is widely used for water treatment and waste water recovery due to good water permeability, water salt selective separation and lower working pressure.
Chinese patent publication No. CN113574022B discloses a membrane separation method, which is mainly aimed at providing a membrane separation method capable of inhibiting the activity of microorganisms in a biofilm existing on a reverse osmosis membrane and stably continuing water treatment for a long period of time. The invention is a method for performing membrane separation treatment by intermittently adding a chlorine-binding agent containing a sulfamic acid compound to water to be treated supplied to a reverse osmosis membrane separation device, wherein intermittent addition is repeated between an intermittent addition water supply period in which the chlorine-binding agent is added to the water to be treated at a concentration that inhibits the activity of microorganisms in a biofilm and water is supplied to the reverse osmosis membrane separation device and a non-addition water supply period in which water is supplied to the reverse osmosis membrane separation device without adding the chlorine-binding agent.
In the water treatment process of membrane separation, a filter cake layer can be grown by attaching a separation membrane, and the existence of the filter cake layer can not only improve the filtering effect of the separation membrane, but also protect the separation membrane to a certain extent and prolong the service life of the separation membrane. However, if the thickness value of the separation membrane exceeds a set standard, the filtration efficiency of the separation membrane is lowered, and the cake layer may be removed by ultrasonic means or by adding a membrane scale inhibitor. However, if the thickness of the filter cake layer is not monitored in real time, the growth of the filter cake layer may be damaged, or if the filter cake layer is removed when the thickness of the filter cake layer is too thick, broken filter cake layer blocks may damage the separation membrane, resulting in a reduction in the service life of the separation membrane.
Disclosure of Invention
Therefore, the invention provides an intelligent water treatment method based on membrane separation, which is used for solving the problem that the service life of a separation membrane is reduced due to the fact that the thickness of a filter cake layer is not monitored in real time in the prior art.
In order to achieve the above object, the present invention provides an intelligent water treatment method based on membrane separation, comprising:
Pretreating the discharged water to obtain secondary water;
Filtering the secondary water through a separation membrane according to the set water pressure;
Periodically detecting the thickness of a filter cake layer attached to the separation membrane, and adjusting the water pressure at two sides of the separation membrane based on the thickness increase value of the filter cake layer in the current period;
When the thickness of the filter cake layer reaches a preset thickness value, if the filtering amount of secondary water in unit time does not meet the standard, detecting the thickness of the filter cake layer attached to the separation membrane to determine a descaling mode or increasing the water pressure at two sides of the separation membrane, wherein the descaling mode comprises ultrasonic descaling and membrane scale inhibitor adding for descaling;
When determining ultrasonic descaling, calculating an ultrasonic power determination parameter to determine the power of ultrasonic waves, and when determining that the added membrane scale inhibitor is used for descaling, calculating an addition amount determination parameter to determine the addition amount of the membrane scale inhibitor;
Or when the water pressure on both sides of the separation membrane is determined to be increased, calculating a water pressure determination parameter to determine the increased water pressure.
Further, periodically detecting the thickness of a filter cake layer attached to the separation membrane, calculating the thickness increase value of the filter cake layer in the current period, and adjusting the water pressure at two sides of the separation membrane based on the thickness increase value of the filter cake layer in the current period;
And the thickness increment value of the current period filter cake layer is the difference value between the detection value of the thickness of the current period filter cake layer and the detection value of the thickness of the last period filter cake layer.
Further, a thickness growth curve of the filter cake layer is preset, and the thickness growth value of the filter cake layer in a preset time period is compared with a standard thickness growth value of the corresponding filter cake layer on the growth curve, so that the water pressure adjusting mode of the two sides of the separation membrane is determined.
Further, adjusting the water pressure on both sides of the separation membrane according to the thickness increase value includes:
if the thickness increment value of the filter cake layer in the preset time period is larger than (1+alpha) times of the standard thickness increment value at the corresponding moment, increasing the water pressure at two sides of the separation membrane;
If the thickness increase value of the filter cake layer within the preset time period is smaller than (1-alpha) times of the standard thickness increase value at the corresponding moment, the water pressure at the two sides of the separation membrane is reduced.
Otherwise, the water pressure at both sides of the separation membrane is not adjusted.
Further, when the thickness of the filter cake layer reaches a preset thickness value, the filtering amount of secondary water in unit time is monitored in real time, and if the filtering amount is smaller than a preset standard filtering amount, the thickness of the filter cake layer attached to the separation membrane is detected to determine a descaling mode.
Further, the detecting the thickness of the filter cake layer attached to the separation membrane to determine the descaling mode includes:
if the thickness of the filter cake layer is larger than a preset first thickness contrast value and smaller than or equal to a preset second thickness contrast value, starting ultrasonic descaling;
and if the thickness of the filter cake layer is larger than the second thickness comparison value, adding a membrane scale inhibitor into the filter tank to remove scale.
Further, when the ultrasonic descaling is judged to be started, calculating an ultrasonic power determination parameter, and determining the power of the ultrasonic wave based on the ultrasonic power determination parameter;
Wherein the ultrasonic power determination parameter is the difference value of the thickness of the filter cake layer and the first thickness comparison value.
Further, when the film scale inhibitor is judged to be added for descaling, calculating an addition quantity determining parameter, and determining the addition quantity of the film scale inhibitor based on the addition quantity determining parameter;
wherein the addition quantity determining parameter is the difference value of the thickness of the filter cake layer and the second thickness contrast value.
Further, the thickness of the filter cake layer attached to the separation membrane is detected, and if the thickness of the filter cake layer is smaller than the first thickness contrast value, it is determined to increase the water pressure on both sides of the separation membrane.
Further, when it is determined that the water pressure on both sides of the separation membrane needs to be increased, calculating a water pressure determination parameter, and determining the increased water pressure based on the water pressure determination parameter;
the water pressure determining parameter is the difference value between the filtering quantity of the secondary water in unit time and the preset standard filtering quantity.
Compared with the prior art, the invention has the beneficial effects that the filter cake layer grows by attaching the separation membrane in the water treatment process of membrane separation, the existence of the filter cake layer can not only improve the filtering effect of the separation membrane, but also protect the separation membrane to a certain extent, and prolong the service life of the separation membrane. However, if the thickness value of the separation membrane exceeds a set standard, the filtration efficiency of the separation membrane is lowered, and the cake layer may be removed by ultrasonic means or by adding a membrane scale inhibitor. However, if the thickness of the filter cake layer is not monitored in real time, the growth of the filter cake layer may be damaged, or if the filter cake layer is removed when the thickness is too thick, the broken filter cake layer may damage the separation membrane. According to the invention, the thickness growth curve of the filter cake layer is preset, and the thickness growth value of the filter cake layer is detected in real time, so that the water pressure at two sides of the separation membrane is regulated, and the growth and filtration efficiency of the filter cake layer are ensured. When the filter cake layer reaches the standard thickness, the filtering quantity of the secondary water in unit time is detected to ensure the filtering efficiency, and when the descaling is judged to be needed, the descaling mode is determined according to the thickness of the filter cake layer, so that the filtering efficiency and the safety of the filter cake layer are ensured, and the service life of the separation membrane is prolonged.
Further, when the water pressure set on two sides of the separation membrane is large, the filtering effect is high, but the growth of the filter cake layer is slow, and when the water pressure set on two sides of the separation membrane is small, the filtering effect is low, but the growth of the filter cake layer is fast.
Further, when the filter cake layer exceeds the standard and is smaller, the ultrasonic wave is adopted for descaling, the ultrasonic wave is mild, the filter cake layer is not damaged, the ultrasonic wave power is determined according to the ultrasonic wave power determination parameter, and the descaling efficiency is improved while the filter cake layer is protected.
Further, when the filter cake layer exceeds a large number of standards, the method is rapid in descaling by adopting a mode of adding the membrane scale inhibitor, the addition amount of the membrane scale inhibitor is determined according to the addition amount determination parameter, and the safety of the filter cake layer is protected while the filter cake layer is rapidly descaled.
Drawings
FIG. 1 is a flow chart of an intelligent water treatment method based on membrane separation according to an embodiment of the invention;
FIG. 2 is a flow chart of step S4 in the intelligent water treatment method based on membrane separation according to the embodiment of the invention;
FIG. 3 is a flowchart of step S3 in the intelligent water treatment method based on membrane separation according to the embodiment of the invention;
Fig. 4 is a flowchart of step S42 in the intelligent water treatment method based on membrane separation according to the embodiment of the present invention.
Detailed Description
The invention will be further described with reference to examples for the purpose of making the objects and advantages of the invention more apparent, it being understood that the specific examples described herein are given by way of illustration only and are not intended to be limiting.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the data in this embodiment are obtained by the intelligent water treatment method based on membrane separation according to the historical experimental data and the corresponding statistical comprehensive analysis of the data in the previous water treatment process, and those skilled in the art can understand that the determination mode of the intelligent water treatment method based on membrane separation according to the single parameter can be that the value with the highest occupation ratio is selected as the preset standard parameter according to the data distribution, so long as the condition that the invention can clearly define different specific conditions in the single judgment process through the obtained value is satisfied.
Referring to fig. 1 to 4, an embodiment of the present invention provides an intelligent water treatment method based on membrane separation, including:
step S1, preprocessing discharged water to obtain secondary water;
Step S2, periodically detecting the thickness of a filter cake layer attached to the separation membrane, and adjusting the water pressure at two sides of the separation membrane based on the thickness increase value of the filter cake layer in the current period;
Step S3, adjusting the water pressure at two sides of the separation membrane according to the thickness increase value of the filter cake layer attached to the separation membrane within a preset time period;
S4, when the thickness of the filter cake layer reaches a preset thickness value, if the filtering amount of secondary water in unit time does not meet the standard, detecting the thickness of the filter cake layer attached to the separation membrane to determine a descaling mode or increasing the water pressure at two sides of the separation membrane, wherein the descaling mode comprises ultrasonic descaling and membrane scale inhibitor adding descaling;
wherein, step S4 includes:
step S41, when determining ultrasonic descaling, calculating an ultrasonic power determination parameter to determine the power of ultrasonic waves, and when determining that the added membrane scale inhibitor is descaled, calculating an addition amount determination parameter to determine the addition amount of the membrane scale inhibitor;
in step S42, when it is determined to increase the water pressure on both sides of the separation membrane, the water pressure after the increase is determined by calculating the water pressure determination parameter.
Such pretreatment includes, but is not limited to, screen filtration, oxygen oxidation, precipitation, biological treatment, etc., of the discharged water.
The membrane scale inhibitor may be selected according to the kind of separation membrane used, such as OSM352, SP-600, ME220, etc., and the present embodiment is not particularly limited.
In the water treatment process of membrane separation, a filter cake layer can be grown by attaching a separation membrane, and the existence of the filter cake layer can not only improve the filtering effect of the separation membrane, but also protect the separation membrane to a certain extent and prolong the service life of the separation membrane. However, if the thickness value of the separation membrane exceeds a set standard, the filtration efficiency of the separation membrane is lowered, and the cake layer may be removed by ultrasonic means or by adding a membrane scale inhibitor. However, if the thickness of the filter cake layer is not monitored in real time, the growth of the filter cake layer may be damaged, or if the filter cake layer is removed when the thickness is too thick, the broken filter cake layer may damage the separation membrane. According to the invention, the thickness growth curve of the filter cake layer is preset, and the thickness growth value of the filter cake layer is monitored in real time so as to adjust the water pressure at two sides of the separation membrane, thereby ensuring the growth and filtration efficiency of the filter cake layer. When the filter cake layer reaches the standard thickness, the filtering quantity of the secondary water in unit time is detected to ensure the filtering efficiency, and when the descaling is judged to be needed, the descaling mode is determined according to the thickness of the filter cake layer, so that the filtering efficiency and the safety of the filter cake layer are ensured, and the service life of the separation membrane is prolonged.
Specifically, step S3 includes:
Step S31, periodically detecting the thickness of a filter cake layer attached to the separation membrane, calculating the thickness increase value of the filter cake layer in the current period, and adjusting the water pressure at two sides of the separation membrane based on the thickness increase value of the filter cake layer in the current period;
And the thickness increment value of the current period filter cake layer is the difference value between the detection value of the thickness of the current period filter cake layer and the detection value of the thickness of the last period filter cake layer.
Specifically, the period for detecting the increase in the thickness of the cake layer is preferably set to 10 days to 15 days.
When the water pressure set on two sides of the separation membrane is large, the filtering effect is high, the filter cake layer grows slowly, when the water pressure set on two sides of the separation membrane is small, the filtering effect is low, but the filter cake layer grows quickly.
And S32, presetting a thickness growth curve of the filter cake layer, and comparing the thickness growth value of the filter cake layer within a preset time period with a standard thickness growth value of the corresponding filter cake layer on the growth curve to determine a regulation mode of water pressure on two sides of the separation membrane.
When the thickness growth curve of the filter cake layer is drawn, the thickness growth values of the filter cake layer in different time periods are set according to the thickness of the filter cake layer and the filtration efficiency of the secondary water, the thickness growth of the filter cake layer and the filtration efficiency of the secondary water are considered, and meanwhile, the use safety of the separation membrane is ensured, so when the thickness of the filter cake layer reaches a preset thickness value, the thickness of the filter cake layer is gradually increased, the thickness growth value is gradually reduced, and the thickness growth curve of the filter cake layer is an arc curve with gradually reduced slope.
Specifically, the adjusting of the water pressure on both sides of the separation membrane according to the thickness increase value includes:
if the thickness increment value of the filter cake layer in the preset time period is larger than (1+alpha) times of the standard thickness increment value at the corresponding moment, increasing the water pressure at two sides of the separation membrane;
If the thickness increase value of the filter cake layer within the preset time period is smaller than (1-alpha) times of the standard thickness increase value at the corresponding moment, the water pressure at the two sides of the separation membrane is reduced.
Otherwise, the water pressure at both sides of the separation membrane is not adjusted.
It is understood that α is an interval parameter, preferably 0.1 to 0.3.
Specifically, for increasing or decreasing the water pressure at two sides of the separation membrane, the water pressure after the increase or decrease can be determined by setting adjustment coefficients, for example, three adjustment coefficients of 0.8, 0.85 and 0.9 are set, when the water pressure needs to be increased, the adjustment coefficient can be selected according to the difference value between the thickness increasing value of the filter cake layer in a preset time period and the standard thickness increasing value x (1+α) at the corresponding time, then the increased water pressure is the current water pressure x (2-adjustment coefficient), and similarly, when the water pressure needs to be decreased, the adjustment coefficient can be selected according to the difference value between the thickness increasing value of the filter cake layer in the preset time period and the standard thickness increasing value x (1- α) at the corresponding time, then the decreased water pressure is the current water pressure x adjustment coefficient. The present embodiment provides yet another embodiment wherein the increased or decreased post-consumer water pressure may be determined by incremental means.
Specifically, when the thickness of the filter cake layer reaches a preset thickness value, the filtering amount of secondary water in unit time is monitored in real time, and if the filtering amount is smaller than a preset standard filtering amount, the thickness of the filter cake layer attached to the separation membrane is detected to determine a descaling mode.
In this embodiment, the filtration amount of the secondary water in a unit time is detected, wherein the filtration amount is the flow rate of the secondary water filtered in a unit time.
It can be understood that the preset thickness value of the filter cake layer is determined according to the type of the separation membrane and the historical test value, so as to ensure the filtering effect, the filtering efficiency and the service life of the separation membrane at the same time. Separation membranes include, but are not limited to, microfiltration Membranes (MF), ultrafiltration membranes (UF), nanofiltration membranes (NF), reverse osmosis membranes (RO), and the like.
It is understood that the preset standard filtration amount is set according to the requirement for the actual filtration efficiency, such as the amount of water discharged on a single day, the amount of water treated on a single day, etc., and the embodiment is not particularly limited.
Specifically, the detecting the thickness of the filter cake layer attached to the separation membrane to determine the descaling mode includes:
if the thickness of the filter cake layer is larger than a preset first thickness contrast value and smaller than or equal to a preset second thickness contrast value, starting ultrasonic descaling;
and if the thickness of the filter cake layer is larger than the second thickness comparison value, adding a membrane scale inhibitor into the filter tank to remove scale.
In this embodiment, when the preset thickness value is smaller than the first thickness contrast value and smaller than the second thickness contrast value, selecting the thickness of the filter cake layer corresponding to the unit time filtering amount detected in the history experiment and the filtered water quality reaching standards, taking the thickness of the filter cake layer as a random variable, subjecting the random variable to a probability density function, further constructing a normal distribution curve according to the probability density function, determining a 95% confidence interval of the normal distribution curve, determining the thickness value of the filter cake layer corresponding to the midpoint of the interval of the 95% confidence interval as the first thickness contrast value, determining the thickness value of the filter cake layer corresponding to the lower limit of the interval of the 95% confidence interval as the second thickness contrast value, and constructing the probability density function and constructing the normal distribution curve based on the probability density function are common technical means in statistics, which are not repeated here.
Specifically, when it is determined that the ultrasonic descaling is required to be started, calculating an ultrasonic power determination parameter, and determining the power of the ultrasonic wave based on the ultrasonic power determination parameter;
Wherein the ultrasonic power determination parameter is the difference value of the thickness of the filter cake layer and the first thickness comparison value.
Specifically, when determining the ultrasonic power, the ultrasonic power can be determined by setting adjustment coefficients, for example, three adjustment coefficients, namely, 0.82, 0.88 and 0.94, selecting the adjustment coefficient according to the ultrasonic power determination parameter, calculating the difference between 2 and the selected adjustment coefficient, and then the adjusted ultrasonic power is the product of the ultrasonic power setting value and the calculated difference. The ultrasonic wave setting power value is set according to the actual situation.
In one embodiment, when the adjustment coefficient is selected according to the ultrasonic power determination parameter, two reference values can be selected according to historical data, wherein the first ultrasonic power comparison parameter and the second ultrasonic power comparison parameter are smaller than the first ultrasonic power comparison parameter, the calculated ultrasonic power determination parameter is compared with the first ultrasonic power comparison parameter and the second ultrasonic power comparison parameter respectively, and the adjustment coefficient is selected according to the comparison result;
when the ultrasonic power determined parameter is smaller than the first ultrasonic power comparison parameter, selecting an adjusting coefficient of 0.94;
When the ultrasonic power determined parameter is greater than or equal to the first ultrasonic power comparison parameter and less than the second ultrasonic power comparison parameter, selecting an adjustment coefficient of 0.88;
and when the ultrasonic power determination parameter is greater than or equal to the second ultrasonic power comparison parameter, selecting an adjustment coefficient of 0.82.
In one embodiment, when determining the first ultrasonic power comparison parameter and the second ultrasonic power comparison parameter, a plurality of calculated ultrasonic power determination parameters in the historical data can be obtained, the ultrasonic power determination parameters are used as random variables, then the random variables obey a probability density function, further a normal distribution curve can be constructed according to the probability density function, a 95% confidence interval of the normal distribution curve is determined, an ultrasonic power determination parameter value corresponding to a middle point of the interval of the 95% confidence interval is determined as the first ultrasonic power comparison parameter, an ultrasonic power determination parameter value corresponding to a lower limit of the interval of the 95% confidence interval is determined as the second ultrasonic power comparison parameter, and a common technical means in statistics are constructed, such that the probability density function and the normal distribution curve is constructed based on the probability density function are omitted.
It can be appreciated that in this embodiment, when determining the selected adjustment coefficient, the above method may be used to determine the corresponding comparison parameter, and determine the selected adjustment coefficient according to the determined comparison parameter.
When the filter cake layer exceeds the standard and is smaller, the ultrasonic wave is adopted to remove the scale, the ultrasonic wave is mild, the filter cake layer is not damaged, the ultrasonic wave power is determined according to the ultrasonic wave power determination parameter, and the scale removal efficiency is improved while the filter cake layer is protected.
Specifically, when the film scale inhibitor is determined to be added for scale removal, calculating an addition amount determining parameter, and determining the addition amount of the film scale inhibitor based on the addition amount determining parameter;
wherein the addition quantity determining parameter is the difference value of the thickness of the filter cake layer and the second thickness contrast value.
Specifically, when determining the addition amount of the membrane scale inhibitor, the determined addition amount of the membrane scale inhibitor is a membrane scale inhibitor base addition amount×an addition amount determination parameter. Wherein the basic addition amount of the membrane scale inhibitor is the amount of the membrane scale inhibitor required for removing the filter cake layer of unit thickness. The addition amount is mass.
When the filter cake layer exceeds a large number of standards, the method is rapid, the addition amount of the membrane scale inhibitor is determined according to the addition amount determination parameter, and the safety of the filter cake layer is protected while the filter cake layer is rapidly removed.
The step S42 includes:
And S421, detecting the thickness of a filter cake layer attached to the separation membrane, and if the thickness of the filter cake layer is smaller than the first thickness comparison value, judging that the water pressure at two sides of the separation membrane is increased.
Step S422, when it is determined that the water pressure on both sides of the separation membrane needs to be increased, calculating a water pressure determination parameter, and determining the increased water pressure based on the water pressure determination parameter;
the water pressure determining parameter is the difference value between the filtering quantity of the secondary water in unit time and the preset standard filtering quantity.
Specifically, when determining the water pressure to be increased, the water pressure to be increased can be determined by setting adjustment coefficients, for example, three adjustment coefficients, namely, 0.7, 0.8 and 0.9, selecting the adjustment coefficients according to the water pressure determination parameters, calculating the difference between 2 and the selected adjustment coefficients, and then the increased water pressure is the product of the current water pressure and the calculated difference.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
Priority Applications (1)
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