Method, system and medium for wastewater treatment using cold rolling spent acid in a fenton process

Abstract

The application provides a cold rolling waste acid wastewater treatment method, system and medium for Fenton process, the cold rolling waste acid wastewater treatment method for Fenton process comprises the following steps: obtaining water quality parameters of to-be-treated wastewater and water quality parameters of cold rolling waste acid; according to the water quality parameters of to-be-treated wastewater and the water quality parameters of cold rolling waste acid, obtaining actual dosing flow of cold rolling waste acid and actual dosing flow of hydrogen peroxide in a reaction unit; according to the actual dosing flow of cold rolling waste acid and the actual dosing flow of hydrogen peroxide, adding cold rolling waste acid and hydrogen peroxide to the reaction unit, so that the cold rolling waste acid, the hydrogen peroxide and the to-be-treated wastewater occur Fenton reaction in the reaction unit; and discharging standard effluent in the reaction unit. The cold rolling waste acid wastewater treatment method, system and medium for Fenton process provided by the application can not only reduce the disposal cost of cold rolling waste acid, but also save the reagent cost in the Fenton reaction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a wastewater treatment method, system and medium for fenton process using cold rolling waste acid. BACKGROUND

[0002] Wastewater treatment is of great significance for both environmental protection and water resource recycling. The most commonly used method for treating cold rolling hydrochloric acid pickling waste liquid in the prior art is to use phosphoric acid tributyl ester-kerosene as an extractant for extraction to separate free hydrochloric acid, and the ferric chloride extraction residue obtained after the extraction method separates the free hydrochloric acid is further treated by calcination to produce FeCl2·2H2O powder, which is calcined at 300-400 DEG C, and the furnace gas is absorbed by a three-stage absorption system to obtain regenerated hydrochloric acid, and iron oxide powder is obtained at the same time.

[0003] In addition, the Fenton reaction is also a very effective wastewater treatment method. The prior art provides a high-efficiency wastewater treatment process based on the Fenton reaction, which comprises the following steps: adjusting the pH value of the wastewater to be treated to 3-5; adding H2O2 and mixing and stirring; adding FeSO4·7H2O in batches, and adjusting the pH of the wastewater to be treated to 3-5 before each addition of FeSO4·7H2O, and stirring for 3-10 minutes after each addition of FeSO4·7H2O; adjusting the pH of the treated wastewater to 7.5-8; adding a flocculating agent to remove the agglomerated precipitate. In this wastewater treatment process, the dosing amount is quantified according to the wastewater conditions, solving the problem of insufficient or excessive dosing affecting the treatment effect; the ferrous salt is added in batches to improve its use efficiency and reduce the amount of reagent and sludge; there is no residual H2O2, reducing the process steps for treating residual H2O2; adding H2O2 in batches to control the amount of hydroxyl radicals generated instantaneously in the system, effectively treating high-COD and refractory organic wastewater.

[0004] However, when the cold rolling waste acid is regenerated and disposed of, a certain amount of extractant and reagent needs to be added for reaction, and high-temperature calcination is required for waste acid regeneration; when the Fenton reaction is used to treat high-concentration and refractory organic wastewater, a certain amount of reagent also needs to be added for reaction. In addition, both the regeneration and disposal of cold rolling waste acid and the Fenton reaction treatment of high-concentration and refractory organic wastewater require the addition of many equipment and facilities, and the treatment cost is high. SUMMARY

[0005] The present application relates to the technical field of wastewater treatment, in particular to a wastewater treatment method, system and medium for fenton process using cold rolling waste acid.

[0006] To achieve the above object, the application realizes the technical scheme as follows: a method for treating wastewater by Fenton process with cold rolling waste acid, comprising: obtaining water quality parameters of wastewater to be treated and water quality parameters of the cold rolling waste acid; obtaining actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in a reaction unit according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid; dosing the cold rolling waste acid and the hydrogen peroxide into the reaction unit according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated have Fenton reaction in the reaction unit; discharging standard effluent in the reaction unit.

[0007] Optionally, the reaction unit comprises a Fenton water inlet pool, a Fenton reaction tower connected with the Fenton water inlet pool, a cold rolling waste acid conveying device and a hydrogen peroxide dosing device connected with the Fenton reaction tower.

[0008] Optionally, the water quality parameters of the wastewater to be treated comprise COD concentration, pH value and flow rate of water in the Fenton water inlet pool; and the water quality parameters of the cold rolling waste acid comprise ferrous chloride concentration in the cold rolling waste acid.

[0009] Optionally, the step of obtaining actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in the reaction unit according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid comprises: obtaining ferrous ion concentration and dosing flow of ferrous sulfate required by the Fenton process and original dosing flow of hydrogen peroxide required by the Fenton process according to the water quality parameters of the wastewater to be treated; obtaining dosing ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit according to the ferrous chloride concentration in the cold rolling waste acid, the ferrous ion concentration and dosing flow of the ferrous sulfate and the original dosing flow of the hydrogen peroxide; and obtaining actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in the reaction unit according to the water quality parameters of the wastewater to be treated and the dosing ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit.

[0010] Optionally, the step of obtaining dosing ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit according to the ferrous chloride concentration in the cold rolling waste acid, the ferrous ion concentration and dosing flow of the ferrous sulfate and the original dosing flow of the hydrogen peroxide comprises: calculating ferrous ion concentration in the cold rolling waste acid according to the ferrous chloride concentration in the cold rolling waste acid; calculating dosing ratio of ferrous sulfate and hydrogen peroxide required by the Fenton process according to the dosing flow of the ferrous sulfate and the original dosing flow of the hydrogen peroxide; and calculating dosing ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit according to the ferrous ion concentration of the ferrous sulfate, the ferrous ion concentration in the cold rolling waste acid and the dosing ratio of the ferrous sulfate and hydrogen peroxide required by the Fenton process.

[0011] Optionally, the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide in the reaction unit are obtained according to the water quality parameter of the wastewater to be treated and the dosing ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit, including: for the wastewater to be treated, the following operations are performed: obtaining a sample of a preset water volume of the wastewater to be treated; calculating a first amount of hydrogen peroxide according to the preset water volume, the water inflow and the original dosing flow of the hydrogen peroxide; calculating a first amount of cold rolling waste acid according to the first amount of hydrogen peroxide and the dosing ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit; adding the cold rolling waste acid to the sample according to a second amount of cold rolling waste acid, so that the pH value in the sample is any value in 3 to 5, wherein the second amount of cold rolling waste acid is not less than the first amount of cold rolling waste acid; calculating a second amount of hydrogen peroxide according to the second amount of cold rolling waste acid and the dosing ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit; adding the hydrogen peroxide to the sample according to the second amount of hydrogen peroxide to perform a simulated Fenton reaction, wherein the simulated Fenton reaction has the same Fenton reaction condition as the reaction unit; judging whether the effluent of the simulated Fenton reaction meets the standard: if yes, obtaining the second amount of cold rolling waste acid and the second amount of hydrogen peroxide, and calculating the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide in the reaction unit according to the preset water volume and the water inflow; if no, adjusting the second amount of cold rolling waste acid and repeating the above operations.

[0012] Optionally, the simulated Fenton reaction includes stirring treatment, PH adjustment treatment, aeration treatment and flocculation and sedimentation treatment.

[0013] Optionally, the cold rolling waste acid and the hydrogen peroxide are added to the reaction unit according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated in the reaction unit perform a Fenton reaction, including: adding the cold rolling waste acid to the Fenton water inlet tank according to the actual dosing flow of the cold rolling waste acid; adding the hydrogen peroxide to the Fenton reaction tower according to the actual dosing flow of the hydrogen peroxide.

[0014] To achieve the above object, the application further provides a wastewater treatment system for Fenton process of cold rolling waste acid, comprising a detection unit, a calculation unit, a reaction unit and a control unit; the detection unit is configured to obtain water quality parameters of wastewater to be treated and water quality parameters of the cold rolling waste acid; the calculation unit is configured to obtain actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in the reaction unit according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid; the control unit is configured to dose the cold rolling waste acid and the hydrogen peroxide to the reaction unit according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated occur Fenton reaction in the reaction unit; the reaction unit is configured to make the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated occur Fenton reaction in the reaction unit, and is used for discharging standard effluent.

[0015] To achieve the above object, the application further provides a medium, wherein the medium stores a computer program, and the computer program is executed by a processor to perform the wastewater treatment method for Fenton process of cold rolling waste acid.

[0016] Compared with the prior art, the wastewater treatment method for Fenton process of cold rolling waste acid, the system and the medium provided by the application have the following beneficial effects:

[0017] The application provides a wastewater treatment method of cold rolling waste acid for Fenton process, which comprises the following steps: obtaining water quality parameters of wastewater to be treated and water quality parameters of the cold rolling waste acid; obtaining actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in a reaction unit according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid; adding the cold rolling waste acid and the hydrogen peroxide into the reaction unit according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated in the reaction unit can generate Fenton reaction; and discharging standard effluent in the reaction unit. Thus, the wastewater treatment method of cold rolling waste acid for Fenton process provided by the application lays a foundation for obtaining actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in the reaction unit by obtaining water quality parameters of wastewater to be treated and water quality parameters of the cold rolling waste acid. Then, the actual dosing flow of the cold rolling waste acid and the actual dosing flow of hydrogen peroxide in the reaction unit are obtained by using the obtained water quality parameters of wastewater to be treated and water quality parameters of the cold rolling waste acid, which lays a foundation for improving Fenton reaction effect of the cold rolling waste acid, hydrogen peroxide and wastewater to be treated in the reaction unit. Then, the cold rolling waste acid and hydrogen peroxide are added into the reaction unit according to the obtained actual dosing flow of the cold rolling waste acid and the actual dosing flow of hydrogen peroxide, so that the cold rolling waste acid, hydrogen peroxide and wastewater to be treated in the reaction unit can generate Fenton reaction. The cold rolling waste acid can replace ferrous sulfate and acid reagent in the traditional Fenton reaction to generate Fenton reaction with hydrogen peroxide and wastewater to be treated, which can reduce disposal cost of the cold rolling waste acid, save reagent cost in the Fenton reaction, and make the Fenton effect better according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of hydrogen peroxide.

[0018] Further, the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide in the reaction unit are obtained according to the water quality parameter of the to-be-treated wastewater and the water quality parameter of the cold rolling waste acid, which comprises: obtaining the ferrous ion concentration and adding flow of the ferrous sulfate required by the Fenton process and the original adding flow of the hydrogen peroxide according to the water quality parameter of the to-be-treated wastewater; obtaining the adding ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit according to the ferrous ion concentration of the ferrous sulfate, the ferrous ion concentration and adding flow of the ferrous sulfate and the original adding flow of the hydrogen peroxide; and obtaining the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide in the reaction unit according to the water quality parameter of the to-be-treated wastewater and the adding ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit. Thus, the wastewater treatment method for the cold rolling waste acid used in the Fenton process provided by the application lays a foundation for obtaining the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide by obtaining the adding ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit according to the water quality parameter of the to-be-treated wastewater and the water quality parameter of the cold rolling waste acid, so that the treatment effect of the to-be-treated wastewater can be better.

[0019] Since the wastewater treatment system and medium for the cold rolling waste acid used in the Fenton process provided by the application and the wastewater treatment method for the cold rolling waste acid used in the Fenton process provided by the application belong to the same inventive concept, the wastewater treatment system and medium for the cold rolling waste acid used in the Fenton process provided by the application at least have all the advantages of the wastewater treatment method for the cold rolling waste acid used in the Fenton process, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A step diagram of the wastewater treatment method for the cold rolling waste acid used in the Fenton process provided by the embodiment one of the application;

[0021] Figure 2 A Fenton reaction process flow chart in the wastewater treatment method for the cold rolling waste acid used in the Fenton process provided by the embodiment one of the application;

[0022] Figure 3 A Fenton reaction process flow chart in the prior art;

[0023] Figure 4 A structure block diagram of the wastewater treatment system for the cold rolling waste acid used in the Fenton process provided by the embodiment two of the application;

[0024] The signs in the drawings are explained as follows:

[0025] 10 - reaction unit, 101 - Fenton water inlet tank, 102 - Fenton reaction tower, 103 - cold rolling waste acid conveying device, 104 - hydrogen peroxide dosing device, 105 - flocculation sedimentation tank, 106 - outlet tank, 20 - detection unit, 30 - calculation unit, 40 - control unit. DETAILED DESCRIPTION

[0026] The cold rolling waste acid for Fenton process wastewater treatment method, system and medium provided by the present application will be further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description. It should be noted that the drawings are very simplified and all use non-precise proportions, only for the purpose of facilitating and clarifying the purpose of assisting the description of the embodiments of the present application. In order to make the purpose, features and advantages of the present application more apparent and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation of the present application. Any modification of structure, change of proportion relationship or adjustment of size, as long as it is the same or similar to the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. The specific design features of the present application disclosed herein include, for example, specific dimensions, directions, positions and shapes, which will be determined in part by the specific application and use environment. In the following description of the embodiments, sometimes the same reference signs are used to represent the same parts or parts with the same function between different drawings, and the repeated description is omitted.

[0027] Embodiment one

[0028] The present embodiment provides a cold rolling waste acid for Fenton process wastewater treatment method. Specifically, please refer to Figure 1 and Figure 2 , Figure 1 The cold rolling waste acid for Fenton process wastewater treatment method provided by the present embodiment is shown in the step diagram; Figure 2 The Fenton reaction process flow chart in the cold rolling waste acid for Fenton process wastewater treatment method provided by the present embodiment is shown in the figure; Figure 1 and Figure 2 It can be seen that the cold rolling waste acid for Fenton process wastewater treatment method comprises:

[0029] S100: obtaining the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid;

[0030] S200: according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid, obtaining the actual dosing flow of the cold rolling waste acid and the actual dosing flow of hydrogen peroxide in the reaction unit 10;

[0031] S300: according to the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide, the cold rolling waste acid and the hydrogen peroxide are added to the reaction unit 10, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated occur Fenton reaction in the reaction unit 10.

[0032] S400: the qualified effluent in the reaction unit 10 is discharged. Thus, the wastewater treatment method for Fenton process by using the cold rolling waste acid provided by the application lays a foundation for obtaining the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide in the reaction unit 10 by obtaining the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid; then, the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide in the reaction unit 10 are obtained by using the obtained water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid, which lays a foundation for improving the Fenton reaction effect of the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated in the reaction unit 10; then, the cold rolling waste acid and the hydrogen peroxide are added to the reaction unit 10 according to the obtained actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated occur Fenton reaction in the reaction unit 10; the cold rolling waste acid can replace the ferrous sulfate and the acid reagent in the traditional Fenton reaction to occur Fenton reaction with the hydrogen peroxide and the wastewater to be treated, which can not only reduce the disposal cost of the cold rolling waste acid, but also save the reagent cost in the Fenton reaction; and the cold rolling waste acid and the hydrogen peroxide are added according to the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide, which can make the Fenton effect better.

[0033] Preferably, the reaction unit 10 comprises a Fenton water inlet tank 101, a Fenton reaction tower 102 connected with the Fenton water inlet tank 101, a cold rolling waste acid conveying device 103 and a hydrogen peroxide adding device 104 connected with the Fenton reaction tower 102. Thus, by arranging the Fenton water inlet tank 101, the pH value of the wastewater to be treated can be adjusted to meet the Fenton reaction conditions; by connecting the cold rolling waste acid conveying device 103 with the Fenton water inlet tank 101, the cold rolling waste acid can be introduced into the Fenton treatment system, which lays a foundation for subsequent treatment of the wastewater by using the cold rolling waste acid; by arranging the hydrogen peroxide adding device 104, the hydrogen peroxide can be added to the Fenton reaction tower 102, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated can occur Fenton reaction in the Fenton reaction tower 102.

[0034] In addition, the reaction unit 10 further comprises a flocculation sedimentation tank 105 connected with the water outlet end of the Fenton reaction tower 102 and an effluent tank 106 connected with the flocculation sedimentation tank 105. Thus, the effluent of the Fenton reaction tower 102 can be discharged to the effluent tank 106 after flocculation and sedimentation treatment.

[0035] Specifically, the flocculation sedimentation tank 105 comprises a flocculation reaction tank and a sedimentation tank. The effluent of the Fenton reaction tower 102 is first transported to the flocculation reaction tank for stirring, alkali addition for pH adjustment, aeration, polyacrylamide addition, sodium hypochlorite addition and other treatments, and then is transported to the effluent tank 106 after sedimentation treatment by the sedimentation tank.

[0036] Please refer to Figure 3 , Figure 3 is a Fenton reaction process flowchart in the prior art. From Figure 3 it can be seen that in the existing Fenton process, an acidic agent (including but not limited to sulfuric acid) is first added to the Fenton water inlet tank 101 to adjust the pH value of the wastewater to be treated to 3 to 5; then the wastewater to be treated is transported to the Fenton reaction tower 102 by a lifting pump (not shown in the figure), and hydrogen peroxide and ferrous sulfate are added to the Fenton reaction tower 102 to react with the wastewater to be treated. In the Fenton process in the present application, cold rolling waste acid is transported to the Fenton water inlet tank 101 instead of adding an acidic agent to the Fenton water inlet tank 101 and adding ferrous sulfate to the Fenton reaction tower 102, and the cold rolling waste acid and hydrogen peroxide are added in a certain proportion to react with the wastewater to be treated.

[0037] Further, in step S100, the water quality parameters of the wastewater to be treated include the COD concentration, the pH value and the flow rate of the water inlet in the Fenton water inlet tank 101; and the water quality parameters of the cold rolling waste acid include the ferrous chloride concentration in the cold rolling waste acid. Thus, by the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid, the addition ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit 10 is obtained, which lays a foundation for obtaining the actual addition flow rate of the cold rolling waste acid and the actual addition flow rate of hydrogen peroxide, so that the treatment effect of the wastewater to be treated can be better.

[0038] Preferably, step S200 specifically comprises:

[0039] S210: obtaining the ferrous ion concentration and the addition flow rate of ferrous sulfate and the original addition flow rate of hydrogen peroxide required by the Fenton process according to the water quality parameters of the wastewater to be treated;

[0040] S220: obtaining the addition ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit 10 according to the ferrous chloride concentration in the cold rolling waste acid, the ferrous ion concentration and the addition flow rate of ferrous sulfate and the original addition flow rate of hydrogen peroxide;

[0041] S230: obtaining the actual addition flow rate of the cold rolling waste acid and the actual addition flow rate of hydrogen peroxide in the reaction unit 10 according to the water quality parameters of the wastewater to be treated and the addition ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit 10.

[0042] Thus, by the obtained ferrous ion concentration of the ferrous sulfate required by the Fenton process and the dosing flow rate and the original dosing flow rate of the hydrogen peroxide required, combined with the obtained ferrous chloride concentration in the cold rolling waste acid, the dosing ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit 10 can be obtained; and according to the water quality parameters of the wastewater to be treated and the obtained dosing ratio of the cold rolling waste acid to the hydrogen peroxide, the actual dosing flow rate of the cold rolling waste acid and the actual dosing flow rate of the hydrogen peroxide in the reaction unit 10 can be obtained.

[0043] Further, the step S220 specifically comprises:

[0044] S221: According to the ferrous chloride concentration in the cold rolling waste acid, the ferrous ion concentration in the cold rolling waste acid is calculated;

[0045] S222: According to the dosing flow rate of the ferrous sulfate and the original dosing flow rate of the hydrogen peroxide, the dosing ratio of the ferrous sulfate to the hydrogen peroxide required by the Fenton process is calculated;

[0046] S223: According to the ferrous ion concentration of the ferrous sulfate, the ferrous ion concentration in the cold rolling waste acid and the dosing ratio of the ferrous sulfate to the hydrogen peroxide required by the Fenton process, the dosing ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit 10 is calculated.

[0047] Thus, by the obtained ferrous ion concentration of the ferrous sulfate and the calculated ferrous ion concentration in the cold rolling waste acid, the dosing ratio of the ferrous sulfate to the hydrogen peroxide required by the Fenton process, the dosing ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit 10 can be calculated, which lays a foundation for obtaining the actual dosing flow rate of the cold rolling waste acid and the actual dosing flow rate of the hydrogen peroxide in the reaction unit 10.

[0048] Specifically, the molecular weight of ferrous chloride is about 127, the ferrous chloride concentration in the cold rolling waste acid is obtained first, and then the ferrous ion concentration in the cold rolling waste acid is calculated according to the following formula (1):

[0049]

[0050] Then, the dosing ratio of the ferrous sulfate to the hydrogen peroxide required by the Fenton process is calculated according to the following formula (2):

[0051]

[0052] And then, the dosing ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit 10 is calculated according to the following formula (3):

[0053]

[0054] Preferably, the step S230 specifically comprises:

[0055] S231: For the wastewater to be treated, the following operations are performed:

[0056] S2311: A sample of a preset water volume of the wastewater to be treated is obtained;

[0057] S2312: A first dosage of hydrogen peroxide is calculated according to the preset water volume, the influent flow rate, and an original dosage flow rate of the hydrogen peroxide;

[0058] S2313: A first dosage of cold rolling waste acid is calculated according to the first dosage of hydrogen peroxide and a dosage ratio of hydrogen peroxide to cold rolling waste acid in the reaction unit 10;

[0059] S2314: The cold rolling waste acid is added to the sample according to a second dosage of cold rolling waste acid, so that the pH value in the sample is any value in 3 to 5, wherein the second dosage of cold rolling waste acid is not less than the first dosage of cold rolling waste acid;

[0060] S2315: A second dosage of hydrogen peroxide is calculated according to the second dosage of cold rolling waste acid and a dosage ratio of cold rolling waste acid to hydrogen peroxide in the reaction unit 10;

[0061] S2316: The hydrogen peroxide is added to the sample according to the second dosage of hydrogen peroxide to perform a simulated Fenton reaction, wherein the simulated Fenton reaction has the same Fenton reaction condition as the reaction unit 10;

[0062] S2317: It is judged whether the effluent of the simulated Fenton reaction meets the standard;

[0063] If yes, step S23171 is performed, the second dosage of cold rolling waste acid and the second dosage of hydrogen peroxide are obtained, and an actual dosage flow rate of cold rolling waste acid and an actual dosage flow rate of hydrogen peroxide in the reaction unit 10 are calculated according to the preset water volume and the influent flow rate;

[0064] If no, the second dosage of cold rolling waste acid is adjusted, and the above step S231 is repeatedly performed.

[0065] Therefore, the first amount of the cold rolling waste acid is calculated first, then the second amount of the cold rolling waste acid, which is not less than the first amount, is added to the sample to make the pH value of the sample be any value in the range of 3 to 5, and the hydrogen peroxide is added to the sample to simulate the Fenton reaction, and then whether the effluent of the simulated Fenton reaction meets the standard is judged, so that the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide in the reaction unit 10 can be obtained more quickly and accurately, and thus when the cold rolling waste acid and the hydrogen peroxide are added to the reaction unit 10 according to the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide, the effluent meeting the standard can be obtained quickly.

[0066] Specifically, the first amount of the hydrogen peroxide can be calculated according to the following formula (4):

[0067]

[0068] In addition, the actual adding flow of the cold rolling waste acid in the reaction unit 10 can be calculated according to the following formula (5):

[0069]

[0070] According to the adding ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit 10, the actual adding flow of the hydrogen peroxide in the reaction unit 10 can be calculated, or the actual adding flow of the hydrogen peroxide in the reaction unit 10 can be calculated according to the following formula (6):

[0071]

[0072] Further, the simulated Fenton reaction includes stirring treatment, pH adjustment treatment, aeration treatment, and flocculation and sedimentation treatment.

[0073] Specifically, the sample to which the hydrogen peroxide and the cold rolling waste acid are added is stirred first, then alkali is added to adjust the pH value, then aeration treatment is performed, then polyacrylamide is added for flocculation treatment and sodium hypochlorite is added for disinfection treatment, and finally sedimentation treatment is performed.

[0074] Preferably, step S300, which involves adding the cold-rolled waste acid and hydrogen peroxide to the reaction unit 10 according to the actual flow rates of the cold-rolled waste acid and hydrogen peroxide, so that the cold-rolled waste acid, hydrogen peroxide, and the wastewater to be treated undergo a Fenton reaction in the reaction unit 10, includes: adding the cold-rolled waste acid to the Fenton inlet tank 101 according to the actual flow rate of the cold-rolled waste acid; and adding hydrogen peroxide to the Fenton reaction tower 102 according to the actual flow rate of the hydrogen peroxide. Therefore, by adding the cold-rolled waste acid to the Fenton inlet tank 101, the pH value of the wastewater to be treated can be adjusted first, thereby enabling the cold-rolled waste acid, hydrogen peroxide, and the wastewater to be treated to produce a better Fenton reaction effect in the Fenton reaction tower 102.

[0075] To better understand the present invention, an exemplary description is given of a process during the overhaul of Meigang cold-rolled acid regeneration, in which vehicles transport cold-rolled acid to a Fenton unit for deep treatment of coking wastewater concentrate to treat the wastewater.

[0076] First, the water quality parameters of the wastewater to be treated and the waste acid from cold rolling were obtained. The water quality parameters of the wastewater to be treated included: the COD concentration of the influent in Fenton inlet tank 101 was 300 mg / L, the pH value of the influent in Fenton inlet tank 101 was 7, and the influent flow rate in Fenton inlet tank 101 was 100 m³ / L. 3 / h. The water quality parameters of the cold rolling waste acid include: the concentration of ferrous chloride in the cold rolling waste acid is 270 g / L.

[0077] Then, based on the water quality parameters of the wastewater to be treated, it can be determined that the ferrous ion concentration of ferrous sulfate required for the original Fenton unit to treat the wastewater was 5.2%, and the ferrous sulfate dosage was 0.2 m³ / h. 3 The concentration of hydrogen peroxide was 30% and the initial flow rate of hydrogen peroxide was 0.04 m³ / h. 3 / h. Based on the ferrous chloride concentration of 270 g / L in the cold rolling waste acid, the following was calculated: This translates to 11.9% by mass. The required ferrous sulfate dosage is 0.2 m³ / h. 3 The required initial flow rate of hydrogen peroxide is 0.04 m³ / h. 3 / h, the calculated required ratio of ferrous sulfate to hydrogen peroxide is 5:1. Therefore, in reaction unit 10 The ratio is approximately 5:2 when rounded down.

[0078] Next, a sample of the wastewater to be treated, with a preset volume of 500 mL, was obtained. Since the influent flow rate was 100 m³ / min... 3 The initial flow rate of hydrogen peroxide added was 0.04 m³ / h. 3Therefore, the first amount of the cold rolling waste acid is calculated to be 0.5 mL. Since the adding ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit 10 is 5:2, the first amount of the cold rolling waste acid is 0.5 mL.

[0079] The second amount of the cold rolling waste acid is 1 mL, and the second amount of the hydrogen peroxide is 0.4 mL. The cold rolling waste acid and the hydrogen peroxide are added to the sample to perform the simulated Fenton reaction experiment. Specifically, the pH value of the 500 mL sample is detected to be 7.18, and the COD concentration is 230 mg / L. Then, 1 mL of the cold rolling waste acid and 0.4 mL of the hydrogen peroxide with a mass fraction of 30% are added to the sample. At this time, the pH value is detected to be 4. After stirring for 1 hour, the pH value is adjusted to 8.96 by adding alkali. After aeration for 2 hours, polyacrylamide and 2 mL of sodium hypochlorite are added. At this time, the pH value is detected to be 7.8. Finally, after standing for 1 hour, the pH value of the effluent is 8.04, the COD concentration is 134 mg / L, and the suspended solids concentration (SS) is 11 mg / L, which can meet the target that the pH value of the effluent ranges from 6 to 9, the COD concentration of the effluent is not higher than 150 mg / L, and the suspended solids concentration (SS) is not higher than 70 mg / L.

[0080] The sample of 500 mL of the wastewater to be treated is obtained again, and 1 mL of the cold rolling waste acid and 0.4 mL of the hydrogen peroxide are added to perform the repeated experiment. Specifically, the pH value of the 500 mL sample is detected to be 7.44, and the COD concentration is 265 mg / L. Then, 1 mL of the cold rolling waste acid and 0.4 mL of the hydrogen peroxide with a mass fraction of 30% are added to the sample. At this time, the pH value is detected to be 4.89. After stirring for 1 hour, the pH value is adjusted to 9.02 by adding alkali. After aeration for 2 hours, polyacrylamide and 2 mL of sodium hypochlorite are added. At this time, the pH value is detected to be 7.43. Finally, after standing for 1 hour, the pH value of the effluent is 8.08, the COD concentration is 83 mg / L, and the suspended solids concentration (SS) is 20 mg / L. Therefore, it can be determined that the Fenton reaction performed by adding 1 mL of the cold rolling waste acid and 0.4 mL of the hydrogen peroxide to the Fenton influent of 500 mL can meet the target that the pH value of the effluent ranges from 6 to 9, the COD concentration of the effluent is not higher than 150 mg / L, and the suspended solids concentration (SS) is not higher than 70 mg / L.

[0081] The Fenton reaction performed by adding 1 mL of the cold rolling waste acid and 0.4 mL of the hydrogen peroxide to the Fenton influent of 500 mL can obtain the qualified effluent, and the influent flow rate of the Fenton influent tank 101 is 100 m 3 / h. It can be calculated that the actual adding flow rate of the hydrogen peroxide in the reaction unit 10 is 0.08 m Since the adding ratio of the cold rolling waste acid to the hydrogen peroxide in the reaction unit 10 is 5:2, the actual adding flow rate of the hydrogen peroxide in the reaction unit 10 is 0.08 m 3 / h.

[0082] Finally, according to the actual adding flow rate of the cold rolling waste acid of 0.2m 3 / h, the actual adding flow rate of the hydrogen peroxide of 0.08m 3 / h, the cold rolling waste acid and the hydrogen peroxide are added into the Fenton device, and the Fenton effluent is tracked to verify that the pH value range of the effluent is 6-9, the COD concentration of the effluent is not higher than 150mg / L, and the suspended solids concentration (SS) is not higher than 70mg / L. At different times, the specific Fenton inlet and outlet water data are shown in the following table (1):

[0083] Table (1): Fenton inlet and outlet water data at different times

[0084]

[0085]

[0086] Example Two

[0087] The present embodiment provides a wastewater treatment system for Fenton process using cold rolling waste acid. Specifically, please refer to Figure 4 , Figure 4 The structure block diagram of the wastewater treatment system for Fenton process using cold rolling waste acid provided in the present embodiment. As can be seen from Figure 4 , the wastewater treatment system comprises a detection unit 20, a calculation unit 30, a reaction unit 10 and a control unit 40; the detection unit 20 is configured to obtain the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid; the calculation unit 30 is configured to obtain the actual adding flow rate of the cold rolling waste acid and the actual adding flow rate of the hydrogen peroxide in the reaction unit 10 according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid; the control unit 40 is configured to add the cold rolling waste acid and the hydrogen peroxide to the reaction unit 10 according to the actual adding flow rate of the cold rolling waste acid and the actual adding flow rate of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated undergo Fenton reaction in the reaction unit 10; the reaction unit 10 is configured to make the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated undergo Fenton reaction in the reaction unit 10, and is used to discharge the effluent meeting the standard.

[0088] Therefore, the wastewater treatment system provided in the present embodiment belongs to the same inventive concept as the wastewater treatment method for Fenton reaction using cold rolling waste acid described in any of the above embodiments, and therefore the wastewater treatment system provided in the present embodiment at least has all the advantages of the wastewater treatment method for Fenton reaction using cold rolling waste acid, which will not be described here.

[0089] Example Three

[0090] The embodiment provides a medium, wherein the medium stores a computer program, and the computer program is executed by a processor to perform the wastewater treatment method of cold rolling waste acid for a Fenton process.

[0091] Since the medium provided by the embodiment performs the wastewater treatment method of cold rolling waste acid for a Fenton process, the medium provided by the embodiment has at least all advantages of the wastewater treatment method of cold rolling waste acid for a Fenton process, and details are not described herein.

[0092] To sum up, the wastewater treatment method of cold rolling waste acid for a Fenton process, the system and the medium have the following advantages: the wastewater treatment method of cold rolling waste acid for a Fenton process comprises the following steps: obtaining water quality parameters of to-be-treated wastewater and water quality parameters of the cold rolling waste acid; obtaining actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in a reaction unit according to the water quality parameters of the to-be-treated wastewater and the water quality parameters of the cold rolling waste acid; adding the cold rolling waste acid and the hydrogen peroxide to the reaction unit according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the to-be-treated wastewater undergo a Fenton reaction in the reaction unit; and discharging standard effluent in the reaction unit. Therefore, the wastewater treatment method of cold rolling waste acid for a Fenton process provided by the application lays a foundation for obtaining actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in a reaction unit by obtaining water quality parameters of to-be-treated wastewater and water quality parameters of the cold rolling waste acid; then the actual dosing flow of the cold rolling waste acid and the actual dosing flow of hydrogen peroxide in the reaction unit are obtained by using the obtained water quality parameters of the to-be-treated wastewater and the water quality parameters of the cold rolling waste acid, which lays a foundation for improving the Fenton reaction effect of the cold rolling waste acid, hydrogen peroxide and to-be-treated wastewater in the reaction unit; and then the cold rolling waste acid and the hydrogen peroxide are added to the reaction unit according to the obtained actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the to-be-treated wastewater undergo a Fenton reaction in the reaction unit, the cold rolling waste acid can replace ferrous sulfate and an acid reagent in a traditional Fenton reaction to undergo a Fenton reaction with hydrogen peroxide and to-be-treated wastewater, which can not only reduce the disposal cost of the cold rolling waste acid, but also save the reagent cost in the Fenton reaction, and the cold rolling waste acid and the hydrogen peroxide are added according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, which can make the Fenton effect better.

[0093] Further, the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide in the reaction unit are obtained according to the water quality parameter of the to-be-treated wastewater and the water quality parameter of the cold rolling waste acid, including: obtaining the ferrous ion concentration and adding flow of the ferrous sulfate required by the Fenton process and the original adding flow of the hydrogen peroxide according to the water quality parameter of the to-be-treated wastewater; obtaining the adding ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit according to the ferrous ion concentration of the ferrous sulfate, the adding flow of the ferrous sulfate and the original adding flow of the hydrogen peroxide in the cold rolling waste acid; obtaining the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide in the reaction unit according to the water quality parameter of the to-be-treated wastewater and the adding ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit. Thus, the wastewater treatment method of the cold rolling waste acid for the Fenton process provided by the application obtains the adding ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit through the water quality parameter of the to-be-treated wastewater and the water quality parameter of the cold rolling waste acid, which lays a foundation for obtaining the actual adding flow of the cold rolling waste acid and the actual adding flow of the hydrogen peroxide, so that the treatment effect of the to-be-treated wastewater can be better.

[0094] Since the wastewater treatment system and medium of the cold rolling waste acid for the Fenton process provided by the application and the wastewater treatment method of the cold rolling waste acid for the Fenton process provided by the application belong to the same inventive concept, the wastewater treatment system and medium of the cold rolling waste acid for the Fenton process provided by the application at least have all the advantages of the wastewater treatment method of the cold rolling waste acid for the Fenton process, which will not be repeated here.

[0095] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the application and not to limit the application. Although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the application.

Claims

1. A method for wastewater treatment of cold rolling spent acid for Fenton process, characterized by, The method comprises the following steps: acquiring water quality parameters of the wastewater to be treated and water quality parameters of the cold rolling waste acid; acquiring actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in the reaction unit according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid; adding the cold rolling waste acid and the hydrogen peroxide to the reaction unit according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated undergo Fenton reaction in the reaction unit; discharging the wastewater meeting the standard from the reaction unit; wherein the reaction unit comprises a Fenton water inlet tank, a Fenton reaction tower connected with the Fenton water inlet tank, a cold rolling waste acid conveying device and a hydrogen peroxide dosing device connected with the Fenton reaction tower; the water quality parameters of the wastewater to be treated comprise COD concentration, pH value and flow rate of water in the Fenton water inlet tank; the water quality parameters of the cold rolling waste acid comprise ferrous chloride concentration in the cold rolling waste acid; the acquiring actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in the reaction unit according to the water quality parameters of the wastewater to be treated and the water quality parameters of the cold rolling waste acid comprises: acquiring ferrous ion concentration and dosing flow of ferrous sulfate required by the Fenton process and original dosing flow of hydrogen peroxide required by the Fenton process according to the water quality parameters of the wastewater to be treated; acquiring dosing ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit according to the ferrous chloride concentration in the cold rolling waste acid, the ferrous ion concentration and dosing flow of the ferrous sulfate and the original dosing flow of the hydrogen peroxide; acquiring actual dosing flow of the cold rolling waste acid and actual dosing flow of hydrogen peroxide in the reaction unit according to the water quality parameters of the wastewater to be treated and the dosing ratio of the cold rolling waste acid and hydrogen peroxide in the reaction unit. The actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide in the reaction unit are obtained according to the water quality parameter of the wastewater to be treated and the dosing ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit, and the method comprises the following steps: for the wastewater to be treated, the following operations are performed: obtaining a sample of a preset water volume of the wastewater to be treated; calculating a first amount of hydrogen peroxide according to the preset water volume, the water inflow and the original dosing flow of the hydrogen peroxide; calculating a first amount of cold rolling waste acid according to the first amount of hydrogen peroxide and the dosing ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit; adding the cold rolling waste acid into the sample according to a second amount of cold rolling waste acid, so that the pH value in the sample is any value in the range of 3 to 5, wherein the second amount of cold rolling waste acid is not less than the first amount of cold rolling waste acid; calculating a second amount of hydrogen peroxide according to the second amount of cold rolling waste acid and the dosing ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit; adding the hydrogen peroxide into the sample according to the second amount of hydrogen peroxide to perform a simulated Fenton reaction, wherein the simulated Fenton reaction has the same Fenton reaction condition as the reaction unit; judging whether the effluent of the simulated Fenton reaction meets the standard: if yes, obtaining the second amount of cold rolling waste acid and the second amount of hydrogen peroxide, and calculating the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide in the reaction unit according to the preset water volume and the water inflow; if no, adjusting the second amount of cold rolling waste acid and repeating the above operations.

2. The method for wastewater treatment of Fenton process using cold rolling spent acid as claimed in claim 1, wherein, The dosing ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit is obtained according to the ferrous chloride concentration in the cold rolling waste acid, the ferrous ion concentration and the dosing flow of the ferrous sulfate and the original dosing flow of the hydrogen peroxide, and the method comprises the following steps: The ferrous ion concentration in the cold rolling waste acid is calculated according to the ferrous chloride concentration in the cold rolling waste acid; The dosing ratio of the ferrous sulfate and the hydrogen peroxide required by the Fenton process is calculated according to the dosing flow of the ferrous sulfate and the original dosing flow of the hydrogen peroxide; The dosing ratio of the cold rolling waste acid and the hydrogen peroxide in the reaction unit is calculated according to the ferrous ion concentration of the ferrous sulfate, the ferrous ion concentration in the cold rolling waste acid and the dosing ratio of the ferrous sulfate and the hydrogen peroxide required by the Fenton process.

3. The method for waste water treatment of Fenton process using cold rolling spent acid as claimed in claim 1, wherein, The simulated Fenton reaction comprises stirring treatment, PH adjustment treatment, aeration treatment and flocculation and sedimentation treatment.

4. The method for waste water treatment of Fenton process using cold rolling spent acid as claimed in claim 1 wherein, The cold rolling waste acid and the hydrogen peroxide are added into the reaction unit according to the actual dosing flow of the cold rolling waste acid and the actual dosing flow of the hydrogen peroxide, so that the cold rolling waste acid, the hydrogen peroxide and the wastewater to be treated undergo Fenton reaction in the reaction unit, and the method comprises the following steps: The cold rolling waste acid is added into the Fenton water inflow tank according to the actual dosing flow of the cold rolling waste acid; The hydrogen peroxide is added into the Fenton reaction tower according to the actual dosing flow of the hydrogen peroxide.

5. A medium characterized by, The medium stores a computer program, and the computer program is executed by a processor to perform the method for treating wastewater of the Fenton process by using the cold rolling waste acid according to any one of claims 1 to 4.

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