Automatic liquid adding treatment system

Abstract

The invention discloses an automatic dosing treatment system, which belongs to the field of automatic dosing and comprises a water inlet section, a treatment section and a water outlet section, the water inlet section comprises a raw water tank and a catalytic reaction device, and a sulfuric acid adding device and a hydrogen peroxide adding device are arranged on the catalytic reaction device; the treatment section comprises a circulating water tank and an ion exchange device; a sodium chloride adding device and a sodium hydroxide adding device are respectively arranged on water outlet pipelines of the circulating water tank and the ion exchange device; the automatic dosing function can dynamically adjust and accurately control the dosing amount according to internal parameters, so that the effluent concentration is ensured to stably reach the standard, the dosing amount can be rapidly and automatically adjusted, the continuous and stable water treatment process is ensured through rapid response, the treatment efficiency is greatly improved, personal errors are effectively avoided, meanwhile, the dosing amount is accurately controlled, the medicament waste is avoided, and the economic benefit is increased. The water quality is monitored in real time and adjusted in time, the water quality is powerfully guaranteed to meet the requirement all the time, and the problem of improper agent adding is remarkably solved.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic dosing, and in particular relates to an automatic dosing water treatment system. Background Art

[0002] Water treatment is the process of treating various water sources using a variety of physical, chemical and biological methods to remove harmful impurities in the water and make it meet the standards for specific uses. It covers different types of water treatment, such as domestic, industrial and sewage. Domestic water treatment ensures the health of residents, industrial water treatment ensures the quality of production equipment and products, and sewage treatment avoids environmental pollution and achieves sustainable use of water resources.

[0003] In the field of water treatment, traditional dosing methods are mainly manual or timed dosing. Manual dosing relies on the operator's experience and judgment, while timed dosing is performed at preset time intervals, which cannot accurately adapt to the dynamic changes in water quality.

[0004] There are many problems with traditional dosing methods. In terms of treatment efficiency, since the dosage cannot be adjusted in real time according to water quality, it is impossible to respond quickly when the water quality changes suddenly, which can easily lead to fluctuations in the water treatment process and affect continuity and stability. In terms of operating costs, manual operation not only has a large workload, but also human factors can easily cause dosing errors. At the same time, it is difficult to accurately control the dosage, which often causes waste of drugs and increases costs. For water quality safety, manual or timed dosing cannot ensure that the dosage of drugs is always appropriate. Insufficient dosage may not effectively treat the water quality, and excessive dosage may cause new water quality problems. There is a great risk of meeting water quality standards. Summary of the invention

[0005] The object of the present invention is to provide an automatic dosing water treatment system to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic dosing water treatment system, comprising a water inlet section, a treatment section and a water outlet section;

[0007] The water inlet section includes a raw water tank and a catalytic reaction device, and the catalytic reaction device is provided with a sulfuric acid dosing device and a hydrogen peroxide dosing device;

[0008] The treatment section includes a circulating water tank and an ion exchange device; the circulating water tank and the ion exchange device outlet pipe are respectively provided with a sodium hydroxide dosing device;

[0009] The water outlet section includes a sedimentation tank and a clean water tank, and a polyacrylamide dosing device is provided on the water inlet pipe of the sedimentation tank;

[0010] The raw water tank, catalytic reaction device, circulating water tank, ion exchange device, sedimentation tank, and clean water tank are connected in sequence;

[0011] The water inlet section, treatment section and water outlet section automatically adjust the dosage according to the internal detection data;

[0012] The water inlet section automatically adjusts the dosage through the following formula:

[0013] Dosing1'=COD+NH3-N+SI, chemical oxygen demand COD, ammonia nitrogen NH3-N, silicon SI are the current measurement process values;

[0014] Dosing1=Dosing1'*kp*{1+1 / ti*p+td*p / [1+(td / kd)*p]};

[0015] kp is (-5 to +5) as the gain coefficient; ti is the integral time (0 to 10s), td is the differential time which gradually increases from 0, kd is the differential coefficient (0 to 3), p is the proportional link (-1 to 1), Dosing1 is the sulfuric acid dosage in the water inlet section, and the amount of hydrogen peroxide and sulfuric acid added by molar concentration meter is 1:1;

[0016] The treatment section automatically adjusts the dosage by the following formula:

[0017] Dosing2'=ORP+CT, the redox point ORP and conductivity CT are the current measurement process values;

[0018] Dosing2=Dosing2'*kp*{1+1 / ti*p+td*p / [1+(td / kd)*p]};

[0019] Dosing2 is the dosage of the treatment section;

[0020] The water outlet section automatically adjusts the dosage through the following formula:

[0021] Dosing3=k3*(COD+NH3-N+TP), where k3 represents the FT3 adjustment coefficient, which takes a value of 0-100% according to the current water output, total phosphorus TP is the current measurement process value, Dosing3 is the dosage of the water output section, and FT3 is the flow rate of the water output section.

[0022] Furthermore, a plurality of data collectors are arranged on the internal pipes of the water inlet section, the treatment section and the water outlet section.

[0023] Furthermore, the catalytic reaction device is connected to a first DC power supply, and the ion exchange device is connected to a second DC power supply.

[0024] Furthermore, valves are provided on the internal connecting pipes of the water inlet section, the treatment section and the water outlet section.

[0025] Furthermore, the circulating water tank and the ion exchange device form a circulation loop through a pipeline.

[0026] Furthermore, the circulating water tank is connected to the sedimentation tank through a pipeline, the upper clear liquid of the sedimentation tank flows into the clean water tank through the pipeline, and the upper clear liquid of the sedimentation tank returns to the circulating water tank through the pipeline.

[0027] Furthermore, the concentration of the sulfuric acid solution added by the sulfuric acid dosing device is 154 g / ml, and the concentration of the hydrogen peroxide solution added by the hydrogen peroxide dosing device is 1.05 g / ml.

[0028] Furthermore, the concentration of the sodium hydroxide solution added by the sodium hydroxide adding device is: 1.35g / ml.

[0029] Furthermore, the concentration of the polyacrylamide solution added by the polyacrylamide adding device is 0.1%, and the density is 1.155 g / cc.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The automatic dosing water treatment system can dynamically adjust the automatic dosing function according to the internal parameters and accurately control the dosage of the agent, so as to ensure that the effluent concentration is stable and meets the standard. The system monitors the water quality in real time and can quickly and automatically adjust the dosage. The rapid response ensures that the water treatment process is continuous and stable, greatly improving the treatment efficiency. By reducing manual operations, human errors are effectively avoided. At the same time, the dosage is accurately controlled to avoid waste of agents and reduce costs. The water quality is monitored in real time and adjusted in time, which effectively ensures that the water quality always meets the requirements and significantly reduces the problem of improper dosage of agents. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of an automatic dosing water treatment system. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the embodiments.

[0034] The following examples are used to illustrate the present invention, but they cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions. Simple improvements to the method of the present invention under the premise of the concept of the present invention belong to the scope of protection claimed in the present invention.

[0035] See also Figure 1 , the present invention provides an automatic dosing water treatment system, including a water inlet section, a treatment section and a water outlet section;

[0036] The water inlet section comprises a raw water tank and a catalytic reaction device, and the catalytic reaction device is provided with a sulfuric acid dosing device and a hydrogen peroxide dosing device.

[0037] The treatment section includes a circulating water tank and an ion exchange device; the circulating water tank and the ion exchange device outlet pipe are respectively provided with a sodium chloride dosing device and a sodium hydroxide dosing device

[0038] The water outlet section includes a sedimentation tank and a clean water tank, and a polyacrylamide dosing device is provided on the water inlet pipe of the sedimentation tank;

[0039] The raw water tank, catalytic reaction device, circulating water tank, ion exchange device, sedimentation tank, and clean water tank are connected in sequence;

[0040] A transport pump and a valve are arranged on the pipeline between the raw water tank and the catalytic reaction device; the catalytic reaction device is connected to a first DC power supply; a sodium chloride dosing device is arranged on the circulating water tank, the circulating water tank and the ion exchange device form a circulation loop through a pipeline, and the ion exchange device is connected to a second DC power supply; and corresponding circulating pumps and valves are arranged on the pipeline, the circulating water tank is connected to the sedimentation tank through the pipeline, the upper clear liquid of the sedimentation tank flows into the clean water tank through the pipeline, and the upper clear liquid of the sedimentation tank can return to the circulating water tank through the pipeline.

[0041] Several data collectors are arranged on the internal pipelines of the water inlet section Dosing1, the treatment section Dosing2 and the water outlet section Dosing3. There are many kinds of data collectors, which are used to collect data such as ammonia nitrogen NH3-N, pH PH, flow FT, chemical oxygen demand COD, pressure PI, redox point ORP, conductivity CT, silicon SI, total phosphorus TP, etc., so as to facilitate the analysis of the subsequent addition amount.

[0042] In the water inlet stage, Dosing1'=COD+NH3-N+SI, COD, NH3-N, and SI are the current measurement process values;

[0043] Dosing1=Dosing1'*kp*{1+1 / ti*p+td*p / [1+(td / kd)*p]}

[0044] Formula notes: kp (-5~+5) is the gain coefficient. When it is positive, it indicates positive gain, that is, increasing the dosage. When it is negative, it indicates negative gain, that is, reducing the dosage. ti-integral time, td-differential time, kd-differential coefficient, p-proportional link. By adjusting the proportional coefficient and integral time, differential control is added. The differential time td gradually increases from 0. The parameters of the controller's proportion p (-1~1), integral time ti (0~10s) and differential kd part (0~3) are repeatedly adjusted to achieve closed-loop calculation and adjust the dosage (sulfuric acid, hydrogen peroxide) and water inlet balance value. The dosage of sulfuric acid and hydrogen peroxide is 1:1. The concentration of sulfuric acid solution added by the sulfuric acid dosing device is: 154g / ml, and the concentration of hydrogen peroxide solution added by the hydrogen peroxide dosing device is: 1.05g / ml.

[0045] Processing stage Dosing2'=ORP+CT, ORP and CT are the current measurement process values;

[0046] Dosing2=Dosing2'*kp*{1+1 / ti*p+td*p / [1+(td / kd)*p]}

[0047] Formula notes: At the same time, under the current conditions, PID, kp (-5 ~ +5) is the gain coefficient. When it is positive, it means positive gain, that is, increase the dosage. When it is negative, it means negative gain, that is, reduce the dosage. ti-integral time, td-differential time, kd-differential coefficient, p-proportional link, by adjusting the proportional coefficient and integral time, adding differential control, differential time td gradually increases from 0, repeatedly adjust the controller's proportional p (-1 ~ +1), integral time ti (0 ~ 10s) and differential kd part (0 ~ 3) parameters to realize FT flow PID calculation to adjust the dosage (sodium hydroxide), the concentration of sodium hydroxide solution added by the sodium hydroxide dosing device is: 1.35g / ml.

[0048] Outlet stage Dosing3=k3*(COD+NH3-N+TP)

[0049] Where k3 represents the FT3 adjustment coefficient, which takes a value of 0 to 100% according to the current water output, and COD, NH3-N, and TP are the current measurement process values;

[0050] Formula Notes: The effluent of this section has basically reached the standard. The effluent COD, TP, and NH3-N are adjusted to the qualified values ​​through the micro-dosing (PAM). The concentration of the polyacrylamide solution added by the polyacrylamide dosing device is: 0.1%, and the density is: 1.155g / cc;

[0051] If the water is qualified, it will be discharged; if the water is unqualified, it will return to the circulating water tank.

[0052] Proportion (P) link:

[0053] In the formula, its function is to adjust the control amount (dosage) in proportion to the current error (the deviation between the actual water quality parameters and the expected water quality parameters). When it is detected that the water quality parameters such as COD and NH3-N deviate greatly from the target value, the dosage will be increased accordingly according to this proportion. The value of the proportional link determines the sensitivity of the dosage to the water quality deviation.

[0054] Points section:

[0055] The integral time ti is used in the integral link. The role of this link is to consider the accumulation of errors over a period of time. If the water quality has been deviating from the target value, the integral link will gradually accumulate this deviation, and as time goes by, its effect on the adjustment of the dosage will become more and more obvious. For example, even if the current water quality deviation is not large, if the water quality has been poor for a long time before, the integral link will increase the dosage according to this accumulated deviation to make up for the previous deficiency and gradually return the water quality to the target value.

[0056] Differentiation link:

[0057] The differential time td- and the differential coefficient kd constitute the differential link. The differential link is mainly used to predict the changing trend of water quality deviation. If the water quality deviation is increasing rapidly, the differential link will react in advance and increase the dosage to suppress this deterioration trend. On the contrary, if the water quality deviation is decreasing, it will appropriately reduce the dosage to prevent overdosing. When the value of the inlet water suddenly increases rapidly, the differential link will quickly adjust the dosage according to this rate of change, so that the system can respond to sudden changes in water quality more quickly.

[0058] For example: Influent water quality monitoring: Sewage continuously enters the treatment plant, and the water quality monitoring instrument at the inlet measures various water quality parameters in real time. The influent COD is 300mg / L, NH3-N is 25mg / L, SI is 10mg / L, and the pH value is 7.2.

[0059] Dosing1'=300+25+10=335.

[0060] The PID parameters are set as follows: kp=1, ti=5s, td=0 (the initial differential time is set to 0 and then adjusted according to the operating conditions), and p=0.5.

[0061] Knowing that Dosing1'=335 (calculated previously), substitute it and the set PID parameters into the sulfuric acid dosage calculation formula:

[0062] Dosing1=335*1*{1+1 / 5*0.5+0*0.5 / [1+(0 / 1)*0.5]}=368.5(L / h)

[0063] During the actual operation, the effluent quality was continuously monitored. After a period of time, it was found that the COD of the effluent was still higher than the expected target value, indicating that the current dosage may be insufficient and the PID parameters need to be adjusted to increase the sulfuric acid dosage.

[0064] The system increases kp to 1.5, adjusts ti to 4s, increases td to 0.5, keeps p unchanged at 0.5, and recalculates Dosing1:

[0065] Dosing1=335*1.5*{1+1 / 4*0.5+0.5*0.5 / [1+(0.5 / 1)*0.5]}

[0066] ≈669.19 (L / h)

[0067] After adjusting the parameters again and running for a period of time, it was observed that the effluent quality still did not reach the ideal state. The system continued to fine-tune the parameters, adjusting kp to 1.3, ti to 4.5s, td to 0.8, and p to 0.6, and calculated Dosing1 again:

[0068] Dosing1=335*1.3*{1+1 / 4.5*0.6+0.8*0.6 / [1+(0.8 / 1)*0.6]}

[0069] ≈634.76(L / h)

[0070] After many adjustments and observations, it was found that when kp=1.3, ti=4.5s, td=0.8, p=0.6, the effluent quality stably reached the expected standard. At this time, the sulfuric acid dosage Dosing1 was about 634.76L / h, which was the more appropriate sulfuric acid and hydrogen peroxide dosage under this working condition.

[0071] The above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the embodiments of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description, and these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. An automatic dosing water treatment system, characterized in that: It includes water inlet section, treatment section and water outlet section; The water inlet section includes a raw water tank and a catalytic reaction device, and the catalytic reaction device is provided with a sulfuric acid dosing device and a hydrogen peroxide dosing device; The treatment section includes a circulating water tank and an ion exchange device; the circulating water tank and the ion exchange device outlet pipe are respectively provided with a sodium hydroxide dosing device; The water outlet section includes a sedimentation tank and a clean water tank, and a polyacrylamide dosing device is provided on the water inlet pipe of the sedimentation tank; The raw water tank, catalytic reaction device, circulating water tank, ion exchange device, sedimentation tank, and clean water tank are connected in sequence; The water inlet section, treatment section and water outlet section automatically adjust the dosage according to the internal detection data; The water inlet section automatically adjusts the dosage through the following formula: Dosing1'=COD+NH3-N+SI, chemical oxygen demand COD, ammonia nitrogen NH3-N, silicon SI are the current measurement process values; Dosing1=Dosing1'*kp*{1+1 / ti*p+td*p / [1+(td / kd)*p]}; kp is (-5 to +5) as the gain coefficient; ti is the integral time (0 to 10s), td is the differential time which gradually increases from 0, kd is the differential coefficient (0 to 3), p is the proportional link (-1 to 1), Dosing1 is the sulfuric acid dosage in the water inlet section, and the amount of hydrogen peroxide and sulfuric acid added by molar concentration meter is 1:1; The treatment section automatically adjusts the dosage by the following formula: Dosing2'=ORP+CT, the redox point ORP and conductivity CT are the current measurement process values; Dosing2=Dosing2'*kp*{1+1 / ti*p+td*p / [1+(td / kd)*p]}; Dosing2 is the dosage of the treatment section; The water outlet section automatically adjusts the dosage through the following formula: Dosing3=k3*(COD+NH3-N+TP), where k3 represents the FT3 adjustment coefficient, which takes a value of 0-100% according to the current water output, total phosphorus TP is the current measurement process value, Dosing3 is the dosage of the water output section, and FT3 is the flow rate of the water output section.

2. The automatic dosing water treatment system according to claim 1 is characterized in that: Several data collectors are arranged on the internal pipes of the water inlet section, the treatment section and the water outlet section.

3. The automatic dosing water treatment system according to claim 1 is characterized in that: The catalytic reaction device is connected to a first DC power supply, and the ion exchange device is connected to a second DC power supply.

4. The automatic dosing water treatment system according to claim 1 is characterized in that: Valves are arranged on the internal communicating pipes of the water inlet section, the treatment section and the water outlet section.

5. The automatic dosing water treatment system according to claim 1 is characterized in that: The circulating water tank and the ion exchange device form a circulating loop through pipelines.

6. The automatic dosing water treatment system according to claim 1 is characterized in that: The circulating water tank is connected with the sedimentation tank through a pipeline, the upper clear liquid of the sedimentation tank flows into the clean water tank through the pipeline, and the upper clear liquid of the sedimentation tank returns to the circulating water tank through the pipeline.

7. The automatic dosing water treatment system according to claim 1 is characterized in that The concentration of the sulfuric acid solution added by the sulfuric acid dosing device is 154 g / ml, and the concentration of the hydrogen peroxide solution added by the hydrogen peroxide dosing device is 1.05 g / ml.

8. The automatic dosing water treatment system according to claim 1 is characterized in that :The concentration of the sodium hydroxide solution added by the sodium hydroxide adding device is: 1.35g / ml.

9. The automatic dosing water treatment system according to claim 1 is characterized in that The concentration of the polyacrylamide solution added by the polyacrylamide dosing device is 0.1% and the density is 1.155 g / cc.

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