CN117819683A - Sewage treatment system and method special for plastic recycling and cleaning line - Google Patents
Sewage treatment system and method special for plastic recycling and cleaning line Download PDFInfo
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- CN117819683A CN117819683A CN202410246435.8A CN202410246435A CN117819683A CN 117819683 A CN117819683 A CN 117819683A CN 202410246435 A CN202410246435 A CN 202410246435A CN 117819683 A CN117819683 A CN 117819683A
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- 238000004064 recycling Methods 0.000 title claims description 29
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
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- Physical Water Treatments (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a special sewage treatment system and a special sewage treatment method for a plastic recovery cleaning line, comprising a pressurized dissolved air floatation machine, a dosing device, a turbidity meter, a data acquisition unit, a first analysis unit, a second analysis unit, an adjustment unit and a correction unit, wherein the pressurized dissolved air floatation machine is used for dissolving air in water and releasing micro bubbles in an air floatation tank so that solid particles float on the water surface to form scum, the dosing device is used for adding a preset amount of PAC into sewage, the turbidity meter is used for monitoring the turbidity of the sewage in the air floatation tank, the first analysis unit judges the sewage treatment effect according to turbidity data and determines whether to adjust the PAC addition amount or dissolved air pressure, and the second analysis unit determines the correction of hydraulic retention time.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system and method special for a plastic recycling and cleaning line.
Background
In modern society, the widespread use of plastics has led to the generation of large amounts of plastic waste. The plastic recycling is an effective resource utilization mode, which not only can reduce the pollution to the environment, but also can save energy and raw materials. One key step in the plastic recycling process is cleaning, which removes contaminants from the plastic, such as food residues, grease, labels, adhesives, and the like. However, the washing process generates a large amount of wastewater containing various pollutants, which, if discharged directly without treatment, would cause serious environmental pollution.
Therefore, wastewater generated in the plastic recycling and cleaning line needs to be purified by an effective sewage treatment system to meet environmental emission standards. Conventional sewage treatment methods include physical, chemical, biological, and the like. The physical method mainly removes suspended matters in the wastewater by screening, precipitation, filtration and other modes; the chemical rule is to change the physical and chemical properties of the pollutant by adding chemicals such as flocculating agent, pH regulator, etc., so that the pollutant is easy to be removed; biological methods utilize the biodegradation of microorganisms to break down organic pollutants.
Among these methods, dissolved air flotation is a common chemical method that forms tiny bubbles by adding air to wastewater, which adhere to the surface of the contaminants, and carry the contaminants to the water surface by buoyancy, forming scum that is easy to remove. In addition, the addition of a flocculating agent (such as polyaluminum chloride PAC) can enhance the aggregation of suspended particles in the sewage, so that the air floatation process is more efficient.
However, in order to ensure efficient operation of the sewage treatment system, fine control and adjustment thereof is required.
Chinese patent application publication No.: CN101445303a discloses a method and a device for recycling sewage for cleaning waste plastics, which comprises the steps of sorting the waste plastics to remove impurities such as metal, sand, stone, fabric and the like, classifying, and crushing to 2-3 meshes; placing the crushed plastic into a cleaning machine, adding proper caustic soda, stirring for 8-12 minutes, injecting water for cleaning for 20-25 minutes, and finally adding an alkaline cleaning agent for cleaning for 3-5 minutes; taking out the cleaned plastic, drying and granulating to obtain plastic raw materials for sale; the sewage after washing enters a water collecting filter tank through a drain pipe with a valve and flows into an electrolytic tank through a filter screen for electrolysis, the sewage enters an aeration tank for aeration treatment after being electrolyzed, the water after aeration enters a dosing tank through a pipeline, polyaluminium chloride and carboxyl starch calcium are added, meanwhile, an aeration pipe valve of the dosing tank is opened, the aeration is carried out for 10-20 minutes, the aeration valve is closed for flocculation reaction, the water after flocculation flows into a sedimentation tank for sedimentation, the water after sedimentation enters the filter tank for filtration, and finally the water after sedimentation flows into a reservoir for recycling; dirt generated in the dosing tank and the sedimentation tank is pumped into the sludge tank by a sludge pipe and a reflux pump, and can be reused after being concentrated. The weight ratio of the crushed plastic to the caustic soda is 200:1; the weight ratio of the crushed plastic to the water is 1:8, 8; the alkaline cleaning agent is a conventional alkaline cleaning agent sold in the market, and the weight ratio of the alkaline cleaning agent to the crushed plastic is 1:1600; the carboxyl starch calcium is prepared from the following raw materials in the following way; polyacrylamide, starch and calcium carbonate, wherein the weight ratio of the polyacrylamide to the starch to the calcium carbonate is 1:1:1, a step of; weighing the raw materials according to a formula, and respectively dissolving polyacrylamide and calcium carbonate into porridge-like materials with water for later use; dissolving starch with ammonia water to obtain porridge; heating the dissolved starch and calcium carbonate to 85-90 ℃, airing to 45 ℃ and combining the polyacrylamide solution.
It follows that the prior art has the following problems: due to the lack of monitoring and accurate adjustment of timely response of the sewage treatment process of the plastic recycling and cleaning line, the sewage treatment efficiency is low and the effect is poor.
Disclosure of Invention
Therefore, the invention provides a special sewage treatment system and method for a plastic recycling and cleaning line, which are used for solving the problems of low sewage treatment efficiency and poor effect caused by lack of monitoring and timely accurate response adjustment of the sewage treatment process of the plastic recycling and cleaning line in the prior art.
In order to achieve the above object, in one aspect, the present invention provides a sewage treatment system dedicated to a plastic recycling and cleaning line, comprising:
the pressurized dissolved air floatation machine is used for dissolving air into water under the preset dissolved air pressure through the dissolved air tank, releasing micro bubbles in the floatation tank through decompression, enabling the bubbles to adhere to solid particles in sewage to reduce the specific gravity of the solid particles, enabling the solid particles to float on the water surface after the preset hydraulic retention time to form scum, and discharging the scum to a scum groove through the scum scraping device;
a dosing device for adding PAC to clear water in the dissolved air tank in a preset PAC adding amount;
the turbidity meter is arranged in the air floatation tank and is used for detecting the turbidity of sewage in the air floatation tank;
the data acquisition unit is connected with the turbidity meter and is used for acquiring turbidity detected by the turbidity meter;
the first analysis unit is connected with the data acquisition unit and is used for determining the judgment of the sewage treatment effect according to the turbidity detected by the turbidity meter;
determining an adjustment to a preset PAC addition amount or determining an adjustment to a preset dissolved air pressure according to a first relative difference between the turbidity and a preset turbidity;
determining whether the sewage treatment effect meets the standard according to the second relative difference between the turbidity and the preset turbidity;
the second analysis unit is connected with the data acquisition unit and the first analysis unit respectively and is used for determining a treatment effect evaluation value of the sewage and determining correction of preset hydraulic retention time of the air floatation tank according to the treatment effect evaluation value;
the adjusting unit is connected with the first analyzing unit and used for adjusting the preset dissolved air pressure and the preset PAC addition amount;
the correction unit is respectively connected with the first analysis unit, the second analysis unit and the adjustment unit and is used for correcting the first adjustment coefficient and the preset hydraulic retention time;
the first relative difference calculation formula is delta A= (R-R0)/R0, and the second relative difference calculation formula is delta B= (R0-R)/R0, wherein delta A represents the first relative difference, R represents turbidity, R0 represents preset turbidity, and delta B represents the second relative difference;
the first adjustment coefficient is calculated by the following formula and is set
；
Wherein X1 represents a first adjustment coefficient, Δa represents a first relative difference.
Further, the first analysis unit determines a determination of the sewage treatment effect based on a comparison result of the turbidity detected by the turbidity meter being less than or equal to a preset turbidity.
Further, the first analysis unit determines adjustment of the preset dissolved air pressure based on a comparison result that the first relative difference is smaller than or equal to a first preset relative difference;
the first analysis unit determines an adjustment to a preset PAC add amount based on a comparison result that the first relative difference is greater than a first preset relative difference.
Further, the adjusting unit adjusts the preset dissolved air pressure according to the first adjusting coefficient.
Further, the adjusting unit determines to adjust the preset PAC additive amount with a second adjustment coefficient based on a comparison result that the first relative difference is less than or equal to a second preset relative difference;
the adjusting unit determines to adjust the preset PAC addition amount by a third adjusting coefficient based on the comparison result that the first relative difference is larger than the second preset relative difference;
wherein X2 is more than 1 and less than X3 is more than 1.5, X2 represents the second adjustment coefficient, and X3 represents the third adjustment coefficient.
Further, the first analysis unit determines that the sewage treatment effect reaches the standard based on the comparison result that the second relative difference is larger than the third preset relative difference.
Further, the second analysis unit calculates an evaluation value of the treatment effect of the sewage according to the following formula, and sets
；
Wherein C represents the evaluation value of the treatment effect, hi represents the turbidity obtained by the ith detection of the turbidity meter in the preset time period T, hh represents the average value of n turbidity values detected by the turbidity meter in the preset time period T, and n represents the detection times of the turbidity meter.
Further, the second analysis unit determines to correct the preset hydraulic retention time of the floatation tank based on the comparison result that the processing effect evaluation value is smaller than the preset processing effect evaluation value.
Further, the correction unit determines to correct the preset hydraulic retention time of the air floatation tank by a second correction coefficient based on the comparison result that the third relative difference is smaller than or equal to the fourth preset relative difference;
the correction unit determines to correct the preset hydraulic retention time of the air floatation tank by a third correction coefficient based on the comparison result that the third relative difference is larger than the fourth preset relative difference;
wherein, 1 < Z2 < Z3 < 1.5, Z2 represents the second correction coefficient, and Z3 represents the third correction coefficient.
The third relative difference calculation formula is as a value of Δc= (C0-C)/C0, where Δc represents the third relative difference, C0 represents the preset processing effect evaluation value, and C represents the processing effect evaluation value.
On the other hand, the invention also provides a method applied to the special sewage treatment system of the plastic recycling and cleaning line, which comprises the following steps:
the data acquisition unit acquires turbidity detected by the turbidity meter;
the first analysis unit determines the judgment of the sewage treatment effect according to the turbidity detected by the turbidity meter;
determining an adjustment to a preset PAC addition amount or determining an adjustment to a preset dissolved air pressure according to a first relative difference between the turbidity and a preset turbidity;
determining whether the sewage treatment effect meets the standard according to the second relative difference between the turbidity and the preset turbidity;
the second analysis unit determines an evaluation value of the treatment effect of the sewage and determines a correction of the preset hydraulic retention time of the floatation tank according to the evaluation value of the treatment effect.
Compared with the prior art, the invention has the beneficial effects that the PAC is directly added into the clean water in the dissolved air tank through the chemical adding device, so that the clean water in the dissolved air tank flocculates sewage in the air floatation tank and bubbles are generated at the same time, so that flocculated solid particles float upwards, and a large number of bubbles directly play a role in stirring, thereby improving the sewage treatment efficiency.
Further, according to the invention, whether the sewage treatment effect is judged is determined according to the comparison result of the turbidity detected by the turbidity meter and the preset turbidity, the turbidity of the sewage is monitored in real time so as to quickly acquire the effect of the treatment process, the system is ensured to quickly respond when the sewage quality changes, whether the sewage treatment effect is required to be judged is automatically determined, the manual intervention is reduced by automatic decision, and the operation efficiency is improved.
Further, according to the method, whether the preset PAC addition amount is adjusted is determined according to the comparison result of the first relative difference and the first preset relative difference, the more refined determination and adjustment mode avoids excessive or insufficient use of chemical medicines, and if the first relative difference is lower than or equal to the first preset relative difference, the dissolved air pressure is selected to be adjusted instead of directly increasing the medicine amount, so that the treatment efficiency is improved under the condition that the cost of the chemical medicines is not increased.
Further, the invention calculates the first adjustment coefficient according to the formula to more accurately adjust the preset dissolved air pressure, quickly responds to the change of the turbidity monitoring result, timely optimizes the efficiency of the air floatation process, and can reduce energy waste due to correct air pressure adjustment, because the system only increases air pressure when needed, but not continuously operates under higher unnecessary air pressure.
Further, according to the comparison result of the first relative difference and the second preset relative difference, the invention determines the adjustment coefficient for adjusting the preset PAC addition amount, so that more accurate and targeted processing is realized, and the preset PAC addition amount is prevented from being excessively adjusted by reasonably setting the range of the adjustment coefficient, thereby avoiding resource waste and potential secondary pollution, and maximizing cost efficiency while ensuring processing effect.
Further, according to the comparison result of the second relative difference and the third preset relative difference, whether the sewage treatment effect meets the standard or not is determined, unnecessary adjustment can be avoided, consumption of chemical medicines is reduced, cost is saved, meanwhile, possible secondary pollution is avoided, the time for manual judgment and possible errors in an automatic judgment process are reduced, the operation efficiency of the whole sewage treatment system is improved, the control of the whole sewage treatment process is enhanced based on a data decision process, and the accuracy and reliability of the treatment effect are maintained.
Furthermore, the first correction coefficient is calculated according to the formula to adjust the first adjustment coefficient, so that correction accuracy is ensured, resource waste caused by excessive correction is avoided, and processing cost is saved on the premise of not sacrificing processing effect.
Further, the invention calculates the evaluation value of the sewage treatment effect according to the formula so as to accurately evaluate the average level and the stability of the sewage turbidity.
Further, according to the comparison result of the treatment effect evaluation value and the preset treatment effect evaluation value, whether the preset hydraulic retention time of the air floatation tank is corrected is determined, and the sewage is ensured to have enough time to be effectively treated in the air floatation tank, so that the treatment effect is improved.
Further, the invention determines the correction coefficient for correcting the preset hydraulic retention time of the air floatation tank according to the comparison result of the third relative difference and the fourth preset relative difference so as to accurately correct the preset hydraulic retention time, and ensures the sewage treatment effect and the treatment efficiency.
Drawings
FIG. 1 is a block diagram of a sewage treatment system dedicated to a plastic recycling cleaning line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sewage treatment system dedicated to a plastic recycling and cleaning line according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of an embodiment of the invention applied to a sewage treatment system dedicated to a plastic recycling cleaning line;
in the figure, a 1-pressurized dissolved air flotation machine, a 2-dissolved air tank, a 3-air flotation tank, a 4-slag scraping device, a 5-slag scraping tank, a 6-first drain pipe, a 7-clear water tank, an 8-second drain pipe, a 9-water pump, a 10-air compressor, an 11-dosing device and a 12-turbidity meter are arranged.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
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, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 3, fig. 1 is a block diagram of a sewage treatment system dedicated to a plastic recycling and cleaning line according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a sewage treatment system dedicated to a plastic recycling and cleaning line according to an embodiment of the present invention; FIG. 3 is a flow chart of a method of applying an embodiment of the invention to a sewage treatment system dedicated to a plastic recycling cleaning line.
The special sewage treatment system for the plastic recycling and cleaning line comprises the following components:
the pressurized dissolved air flotation machine 1 is used for dissolving air into water under the preset dissolved air pressure Q through the dissolved air tank 2, releasing micro bubbles in the air flotation tank 3 through decompression, enabling the bubbles to adhere to solid particles in sewage to reduce the specific gravity of the solid particles, enabling the solid particles to float on the water surface to form scum after the preset hydraulic retention time F2, then discharging the scum to the scum tank 5 through the scum scraping device 4, discharging clear water to the clear water tank 7 through the first drain pipe 6 and then discharging the clear water from the second drain pipe 8, pumping clear water in the clear water tank into the dissolved air tank through the water pump 9, and compressing air to the dissolved air tank 2 through the air compressor 10;
a dosing device 11 connected with the water pump 9 for adding PAC to the clean water in the dissolved air tank 2 at a preset PAC addition amount F1;
a turbidity meter 12 disposed in the floatation tank for detecting turbidity of the sewage in the floatation tank;
the data acquisition unit is connected with the turbidity meter and is used for acquiring turbidity detected by the turbidity meter;
the first analysis unit is connected with the data acquisition unit and is used for determining the judgment of the sewage treatment effect according to the turbidity R detected by the turbidity meter;
determining adjustment of a preset PAC addition F1 or determining adjustment of a preset dissolved air pressure Q according to a first relative difference delta A between the turbidity R and a preset turbidity R0;
determining whether the sewage treatment effect reaches the standard according to a second relative difference delta B between the turbidity R and a preset turbidity R0;
the second analysis unit is respectively connected with the data acquisition unit and the first analysis unit and is used for determining a treatment effect evaluation value C of the sewage and determining the correction of the preset hydraulic retention time F2 of the air floatation tank according to the treatment effect evaluation value C;
the adjusting unit is connected with the first analyzing unit and used for adjusting the preset dissolved air pressure Q and the preset PAC addition quantity F1;
and the correction unit is respectively connected with the first analysis unit, the second analysis unit and the adjustment unit and is used for correcting the first adjustment coefficient X1 and the preset hydraulic retention time F2.
In the embodiment of the invention, the preset dissolved air pressure Q is 250Kpa, the preset PAC addition amount F1 is 10mg/L, and the preset hydraulic retention time F2 is 5min; the dosing device is preferably a BHJY-2X 0.5-32/2.4-2 double-tank double-pump dosing device, and the turbidimeter is preferably an STZ-A2 type high turbidity online turbidimeter.
Specifically, PAC is directly added into the dissolved air tank through the dosing device, so that clean water in the dissolved air tank flocculates sewage in the air floatation tank and bubbles are generated at the same time, so that flocculated solid particles float upwards, and a large number of bubbles directly play a role in stirring, thereby improving the sewage treatment efficiency.
Specifically, the first analysis unit determines whether to judge the sewage treatment effect according to the comparison result of the turbidity R detected by the turbidity meter and the preset turbidity R0;
if R is less than or equal to R0, the first analysis unit determines to judge the sewage treatment effect;
if R is more than R0, the first analysis unit determines that the sewage treatment effect is not judged;
in the embodiment of the present invention, the preset turbidity R0 is 100NTU, and a person skilled in the art can adjust the preset turbidity R0 according to specific conditions.
Specifically, according to the invention, whether the sewage treatment effect is judged is determined according to the comparison result of the turbidity detected by the turbidity meter and the preset turbidity, the turbidity of the sewage is monitored in real time to immediately know the effect of the treatment process, the system is ensured to respond rapidly when the sewage quality changes, whether the sewage treatment effect is required to be judged is automatically determined, the manual intervention is reduced by automatic decision, and the operation efficiency is improved.
Specifically, the first analysis unit calculates a first relative difference Δa between the turbidity R and a preset turbidity R0 under the condition that the sewage treatment effect is not determined, determines whether to adjust a preset PAC add amount F1 according to a comparison result of the first relative difference Δa and the first preset relative difference Δa0, and sets Δa= (R-R0)/R0;
if delta A is less than or equal to delta A0, the first analysis unit determines to adjust the preset dissolved air pressure Q;
if delta A > -delta A0, the first analysis unit determines to adjust the preset PAC addition F1;
in the embodiment of the present invention, the first preset relative difference Δa0 takes a value of 1, where the first preset relative difference Δa0 is determined under the condition that the turbidity R is 200NTU, and a person skilled in the art can adjust the first preset relative difference Δa0 according to specific situations.
Specifically, according to the comparison result of the first relative difference and the first preset relative difference, whether the preset PAC addition amount is adjusted is determined, the more refined determination and adjustment mode avoids excessive or insufficient use of chemical medicines, and if the first relative difference is lower than or equal to the first preset relative difference, the dissolved air pressure is selected to be adjusted instead of directly increasing the medicine amount, so that the treatment efficiency is improved under the condition that the cost of the chemical medicines is not increased.
Specifically, the first analysis unit adjusts the preset dissolved air pressure Q according to the following first adjustment coefficient X1 under the condition that the preset dissolved air pressure Q is determined to be adjusted, and sets:
；
wherein Δa represents the first relative difference.
The adjusted dissolved air pressure was set to qq=q×x1.
Specifically, the invention calculates the first adjustment coefficient according to the formula to more accurately adjust the preset dissolved air pressure, quickly responds to the change of the turbidity monitoring result, timely optimizes the efficiency of the air floatation process, and can reduce energy waste due to correct air pressure adjustment, because the system only increases air pressure when needed, but not continuously operates under higher unnecessary air pressure.
Specifically, the first analysis unit determines an adjustment coefficient for adjusting the preset PAC additive amount F1 according to a comparison result of the first relative difference Δa and the second preset relative difference Δa1 under the condition that the preset PAC additive amount F1 is determined to be adjusted;
if delta A is less than or equal to delta A1, the adjusting unit determines to adjust the preset PAC addition amount F1 by a second adjusting coefficient X2;
if DeltaA > DeltaA1, the adjusting unit determines to adjust the preset PAC addition amount F1 by a third adjusting coefficient X3;
setting the adjusted preset PAC added amount F1 to ff1=f1×x2, or ff1=f1×x3;
in the embodiment of the invention, X2 is more than 1 and less than 1.5, the value of the second adjustment coefficient X2 is preferably 1.2, and the value of the third adjustment coefficient X3 is preferably 1.4.
In the embodiment of the present invention, the second preset relative difference Δa1 takes a value of 2, where the second preset relative difference Δa1 is determined under the condition that the turbidity R is 300NTU, and a person skilled in the art can adjust the second preset relative difference Δa1 according to specific situations.
Specifically, the invention determines the adjustment coefficient for adjusting the preset PAC addition according to the comparison result of the first relative difference and the second preset relative difference, realizes more accurate and targeted processing, and prevents the preset PAC addition from being excessively adjusted by reasonably setting the range of the adjustment coefficient, thereby avoiding resource waste and potential secondary pollution, and maximizing cost efficiency while ensuring the processing effect.
Specifically, the first analysis unit calculates a second relative difference Δb between the turbidity R and a preset turbidity R0 under the condition of determining the sewage treatment effect, determines whether the sewage treatment effect reaches the standard according to the comparison result of the second relative difference Δb and a third preset relative difference Δb0, and sets Δb= (R0-R)/R0;
if delta B is less than or equal to delta B0, the first analysis unit determines that the sewage treatment effect does not reach the standard;
if delta B > -delta B0, the first analysis unit determines that the sewage treatment effect reaches the standard;
in the embodiment of the present invention, the third preset relative difference Δb0 is 0.5, and the third preset relative difference Δb0 is obtained when the turbidity R is 50NTU, and a person skilled in the art can adjust the third preset relative difference Δb0 according to specific situations.
Specifically, the invention determines whether the sewage treatment effect meets the standard according to the comparison result of the second relative difference and the third preset relative difference, can avoid unnecessary adjustment, reduce the consumption of chemical medicines, save the cost, simultaneously avoid possible secondary pollution, reduce the time of manual judgment and possible errors in the automatic judgment process, improve the operation efficiency of the whole sewage treatment system, enhance the control of the whole sewage treatment process based on the decision process of data, and help to maintain the accuracy and reliability of the treatment effect.
Specifically, the first analysis unit adjusts the first adjustment coefficient X1 according to the following first correction coefficient Z1, and sets up:
；
wherein Δb represents the second relative difference.
The adjusted first adjustment coefficient X1 is set to xx1=x1×z1.
Specifically, the method calculates the first correction coefficient according to the formula to adjust the first adjustment coefficient, ensures correction accuracy, avoids resource waste caused by excessive correction, and saves processing cost on the premise of not sacrificing processing effect.
Specifically, the first analysis unit calculates the sewage treatment effect evaluation value C according to the following formula, and sets up:
；
wherein hi represents the turbidity obtained by the ith detection of the turbidity meter in the preset time period T, hh represents the average value of n turbidity values detected by the turbidity meter in the preset time period T, and n represents the detection times of the turbidity meter.
In the embodiment of the invention, the preset time length T takes a value of 5min, and a person skilled in the art can adjust the preset time length T according to specific conditions.
Specifically, the invention calculates the evaluation value of the sewage treatment effect according to the formula so as to accurately evaluate the average level and the stability of the sewage turbidity.
Specifically, the second analysis unit determines whether to correct the preset hydraulic retention time F2 of the floatation tank according to the comparison result of the treatment effect evaluation value C and the preset treatment effect evaluation value C0 under the condition that the treatment effect evaluation value C of the sewage is calculated;
if C is less than C0, the second analysis unit determines to correct the preset hydraulic retention time F2 of the floatation tank;
if C is more than or equal to C0, the second analysis unit determines that the preset hydraulic retention time F2 of the air floatation tank is not corrected;
in the embodiment of the present invention, the preset treatment effect evaluation value C0 is 0.7, and a person skilled in the art can adjust the preset treatment effect evaluation value C0 according to specific situations.
Specifically, according to the comparison result of the treatment effect evaluation value and the preset treatment effect evaluation value, whether the preset hydraulic retention time of the air floatation tank is corrected is determined, and the sewage is ensured to have enough time to be effectively treated in the air floatation tank, so that the treatment effect is improved.
Specifically, the second analysis unit calculates a third relative difference Δc between the treatment effect evaluation value C and a preset treatment effect evaluation value C0 under the condition of determining the correction of the preset hydraulic retention time F2 of the air floatation tank, and determines a correction coefficient for correcting the preset hydraulic retention time F2 of the air floatation tank according to the comparison result of the third relative difference Δc and a fourth preset relative difference Δc0, and sets Δc= (C0-C)/C0;
if the delta C is less than or equal to delta C0, the correction unit determines to correct the preset hydraulic retention time F2 of the air floatation tank by a second correction coefficient Z2;
if DeltaC > DeltaC0, the correction unit determines to correct the preset hydraulic retention time F2 of the air floatation tank by a third correction coefficient Z3;
setting the hydraulic retention time of the regulated floatation tank to be FF2 = F2 x Z2 or FF2 = F2 x Z3;
in the embodiment of the invention, Z2 is more than 1 and less than 1.5, the value of the second correction coefficient Z2 is preferably 1.1, and the value of the third correction coefficient Z3 is preferably 1.2.
In the embodiment of the present invention, the fourth preset relative difference Δc0 takes a value of 0.3, where the fourth preset relative difference Δc0 is obtained when the treatment effect evaluation value C is 0.5, and a person skilled in the art can adjust the fourth preset relative difference Δc0 according to specific situations.
Specifically, the invention determines the correction coefficient for correcting the preset hydraulic retention time of the air floatation tank according to the comparison result of the third relative difference and the fourth preset relative difference so as to accurately correct the preset hydraulic retention time, and ensures the sewage treatment effect and the treatment efficiency.
The method for applying the embodiment of the invention to the special sewage treatment system of the plastic recycling and cleaning line comprises the following steps:
step S1, a data acquisition unit acquires turbidity detected by a turbidity meter;
step S2, a first analysis unit determines judgment on the sewage treatment effect according to turbidity R detected by a turbidity meter;
determining adjustment of a preset PAC addition F1 or determining adjustment of a preset dissolved air pressure Q according to a first relative difference delta A between the turbidity R and a preset turbidity R0;
determining whether the sewage treatment effect reaches the standard according to a second relative difference delta B between the turbidity R and a preset turbidity R0;
and S3, determining a treatment effect evaluation value C of the sewage by a second analysis unit, and determining the correction of the preset hydraulic retention time F2 of the air floatation tank according to the treatment effect evaluation value C.
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 foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; 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)
1. A sewage treatment system dedicated to a plastic recycling cleaning line, comprising:
the pressurized dissolved air floatation machine is used for dissolving air into water under the preset dissolved air pressure through the dissolved air tank, releasing micro bubbles in the floatation tank through decompression, enabling the bubbles to adhere to solid particles in sewage to reduce the specific gravity of the solid particles, enabling the solid particles to float on the water surface after the preset hydraulic retention time to form scum, and discharging the scum to a scum groove through the scum scraping device;
a dosing device for adding PAC to clear water in the dissolved air tank in a preset PAC adding amount;
the turbidity meter is arranged in the air floatation tank and is used for detecting the turbidity of sewage in the air floatation tank;
the data acquisition unit is connected with the turbidity meter and is used for acquiring turbidity detected by the turbidity meter;
the first analysis unit is connected with the data acquisition unit and is used for determining the judgment of the sewage treatment effect according to the turbidity detected by the turbidity meter;
determining an adjustment to a preset PAC addition amount or determining an adjustment to a preset dissolved air pressure according to a first relative difference between the turbidity and a preset turbidity;
determining whether the sewage treatment effect meets the standard according to the second relative difference between the turbidity and the preset turbidity;
the second analysis unit is connected with the data acquisition unit and the first analysis unit respectively and is used for determining a treatment effect evaluation value of the sewage and determining correction of preset hydraulic retention time of the air floatation tank according to the treatment effect evaluation value;
the adjusting unit is connected with the first analyzing unit and used for adjusting the preset dissolved air pressure and the preset PAC addition amount;
the correction unit is respectively connected with the first analysis unit, the second analysis unit and the adjustment unit and is used for correcting the first adjustment coefficient and the preset hydraulic retention time;
the first relative difference calculation formula is delta A= (R-R0)/R0, and the second relative difference calculation formula is delta B= (R0-R)/R0, wherein delta A represents the first relative difference, R represents turbidity, R0 represents preset turbidity, and delta B represents the second relative difference;
the first adjustment coefficient is calculated by the following formula and is set
；
Wherein X1 represents a first adjustment coefficient, Δa represents a first relative difference.
2. The sewage treatment system dedicated to a plastic recycling washing line according to claim 1, wherein the first analyzing unit determines the judgment of the sewage treatment effect based on a comparison result of turbidity detected by the turbidity meter being equal to or less than a preset turbidity.
3. The sewage treatment system dedicated to a plastic recycling cleaning line according to claim 2, wherein the first analysis unit determines adjustment of a preset dissolved air pressure based on a comparison result of the first relative difference being equal to or smaller than a first preset relative difference;
the first analysis unit determines an adjustment to a preset PAC add amount based on a comparison result that the first relative difference is greater than a first preset relative difference.
4. A sewage treatment system dedicated to a plastic recycling cleaning line according to claim 3, wherein the adjusting unit adjusts the preset dissolved air pressure by a first adjusting coefficient.
5. The sewage treatment system dedicated to a plastic recycling washing line according to claim 4, wherein the adjustment unit determines to adjust the preset PAC addition amount with a second adjustment coefficient based on a comparison result that the first relative difference is equal to or smaller than a second preset relative difference;
the adjusting unit determines to adjust the preset PAC addition amount by a third adjusting coefficient based on the comparison result that the first relative difference is larger than the second preset relative difference;
wherein X2 is more than 1 and less than X3 is more than 1.5, X2 represents the second adjustment coefficient, and X3 represents the third adjustment coefficient.
6. The sewage treatment system dedicated to a plastic recycling cleaning line according to claim 5, wherein the first analyzing unit determines that the sewage treatment effect reaches the standard based on the comparison result that the second relative difference is greater than a third preset relative difference.
7. The sewage treatment system dedicated to a plastic recycling washing line according to claim 6, wherein the second analyzing unit calculates a sewage treatment effect evaluation value according to the following formula, and sets up
；
Wherein C represents the evaluation value of the treatment effect, hi represents the turbidity obtained by the ith detection of the turbidity meter in the preset time period T, hh represents the average value of n turbidity values detected by the turbidity meter in the preset time period T, and n represents the detection times of the turbidity meter.
8. The sewage treatment system dedicated to a plastic recovery washing line according to claim 7, wherein the second analysis unit determines to correct the preset hydraulic retention time of the floatation tank based on a comparison result that the treatment effect evaluation value is smaller than a preset treatment effect evaluation value.
9. The sewage treatment system dedicated to a plastic recovery washing line according to claim 8, wherein the correction unit determines to correct the preset hydraulic retention time of the floatation tank by the second correction coefficient based on a comparison result that the third relative difference is equal to or smaller than a fourth preset relative difference;
the correction unit determines to correct the preset hydraulic retention time of the air floatation tank by a third correction coefficient based on the comparison result that the third relative difference is larger than the fourth preset relative difference;
wherein, Z2 is more than 1 and less than Z3 is more than 1.5, Z2 represents a second correction coefficient, and Z3 represents a third correction coefficient;
the third relative difference calculation formula is as a value of Δc= (C0-C)/C0, where Δc represents the third relative difference, C0 represents the preset processing effect evaluation value, and C represents the processing effect evaluation value.
10. A method for application to the dedicated sewage treatment system for a plastic recycling line according to any one of claims 1 to 9, comprising:
the data acquisition unit acquires turbidity detected by the turbidity meter;
the first analysis unit determines the judgment of the sewage treatment effect according to the turbidity detected by the turbidity meter;
determining an adjustment to a preset PAC addition amount or determining an adjustment to a preset dissolved air pressure according to a first relative difference between the turbidity and a preset turbidity;
determining whether the sewage treatment effect meets the standard according to the second relative difference between the turbidity and the preset turbidity;
the second analysis unit determines an evaluation value of the treatment effect of the sewage and determines a correction of the preset hydraulic retention time of the floatation tank according to the evaluation value of the treatment effect.
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| JP2014065030A (en) * | 2012-09-05 | 2014-04-17 | Metawater Co Ltd | Water processing control method, and water processing control device |
| CN111268780A (en) * | 2020-03-10 | 2020-06-12 | 中冶赛迪重庆信息技术有限公司 | Sewage treatment method |
| CN113716827A (en) * | 2021-09-28 | 2021-11-30 | 中国市政工程东北设计研究总院有限公司 | Be applicable to cold area row muddy water processing integrated system |
| CN116947180A (en) * | 2023-06-26 | 2023-10-27 | 上海矾花科技有限公司 | Chemical precipitation water treatment system and control method of chemical precipitant addition amount |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014065030A (en) * | 2012-09-05 | 2014-04-17 | Metawater Co Ltd | Water processing control method, and water processing control device |
| CN111268780A (en) * | 2020-03-10 | 2020-06-12 | 中冶赛迪重庆信息技术有限公司 | Sewage treatment method |
| CN113716827A (en) * | 2021-09-28 | 2021-11-30 | 中国市政工程东北设计研究总院有限公司 | Be applicable to cold area row muddy water processing integrated system |
| CN116947180A (en) * | 2023-06-26 | 2023-10-27 | 上海矾花科技有限公司 | Chemical precipitation water treatment system and control method of chemical precipitant addition amount |
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