A wastewater treatment method and system in the process of extracting ethyl ferulate

Abstract

The present application relates to the technical field of wastewater treatment, and specifically relates to a wastewater treatment method and system in the process of extracting ethyl ferulate. The method includes: during the hydrolysis acidification treatment process, obtaining the COD content, turbidity and pH value in the wastewater from ferulic acid production; according to the change of the pH value in the wastewater from ferulic acid production, obtaining the organic matter conversion intensity at each moment; combining the decline trends of the COD content and turbidity in the wastewater from ferulic acid production, obtaining the decontamination effect evaluation value at each moment, and further obtaining the comprehensive effect monitoring value of hydrolysis acidification at each moment; controlling the end moment of the hydrolysis acidification of the wastewater from ferulic acid production through the comprehensive effect monitoring value, and then performing biochemical treatment, secondary coagulation sedimentation and solid sedimentation treatment. The present application can improve the treatment efficiency of the wastewater from ferulic acid production.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a wastewater treatment method and system in the process of extracting ethyl ferulate from natural sources. Background Art

[0002] Ferulic acid is the phenolic acid with the highest content in wheat bran matrix. The existing process can quickly and effectively release free ferulic acid from wheat bran matrix by alkaline hydrolysis method, so as to realize the preparation and extraction of natural ferulic acid. However, after the preparation and extraction of ferulic acid by alkaline hydrolysis method, alkaline production wastewater will be generated. If the production wastewater is not properly treated and discharged into the ecological environment, it will cause great harm to the ecological environment.

[0003] In the process of treating the production wastewater after the preparation and extraction of ferulic acid, in order to improve the biodegradability of the subsequent treatment of the production wastewater and remove the suspended solids and organic matter in the production wastewater at the same time, hydrolysis acidification is mostly adopted as the pretreatment unit of the biochemical treatment process to reduce the burden of biochemical treatment of the production wastewater. However, due to the possible changes in the pollution situation of the production wastewater after the preparation and extraction of ferulic acid, the traditional biochemical treatment process cannot accurately adaptively adjust the treatment time of hydrolysis acidification, so it cannot effectively improve the biodegradability of the production wastewater, and cannot effectively remove the suspended solids and organic matter in the production wastewater, resulting in poor effect of subsequent biochemical treatment of the production wastewater. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present application is to provide a wastewater treatment method and system in the process of extracting ethyl ferulate from natural sources, and the specific technical solutions adopted are as follows:

[0005] The embodiment of the present application provides a wastewater treatment method in the process of extracting ethyl ferulate from natural sources, including the following steps:

[0006] During the treatment process of hydrolysis acidification, obtain the COD content, turbidity and pH value in the ferulic acid production wastewater;

[0007] According to the change situation of the pH value in the ferulic acid production wastewater, obtain the frequency of acid-base change at each moment, combine the degree of chaos of the pH value change and the fluctuation degree of the change frequency, obtain the complexity of acid-base change at each moment, and obtain the organic matter conversion intensity at each moment through the frequency of acid-base change and the complexity of acid-base change;

[0008] Combine the decreasing trends of the COD content and turbidity in the ferulic acid production wastewater to obtain the decontamination effect evaluation value at each moment;

[0009] Using the correlation between the organic matter conversion intensity and the decontamination effect evaluation value at multiple moments before each moment, and combining the organic matter conversion intensity and the decontamination effect evaluation value at each moment, the comprehensive effect monitoring value of hydrolysis acidification at each moment is obtained;

[0010] Controlling the end moment of hydrolysis acidification of ferulic acid production wastewater through the comprehensive effect monitoring value, and then performing biochemical treatment, secondary coagulation sedimentation and solid sedimentation treatment.

[0011] Preferably, the method for obtaining the frequency of acid-base change at each moment is as follows:

[0012] Regarding the T moments with the closest time intervals to each moment as the local neighboring moments of each moment, and arranging the pH values of each moment and all its local neighboring moments in chronological order to form the short-term acid-base vector of each moment;

[0013] Statistically analyze the frequencies of the elements in the first-order difference vector of the short-term acid-base vector, calculate the absolute value of the product of each element in the first-order difference vector of the short-term acid-base vector of each moment and its frequency, and take the sum of all the calculated absolute values as the frequency of acid-base change at each moment.

[0014] Preferably, the method for obtaining the complexity of acid-base change at each moment is as follows:

[0015] Calculate the information entropy of all elements in the first-order difference vector of the short-term acid-base vector, and the standard deviation of the corresponding frequencies of the elements in the first-order difference vector of the short-term acid-base vector, and record the product of the information entropy and the standard deviation as the complexity of acid-base change at the t-th moment.

[0016] Preferably, the organic matter conversion intensity at each moment is the average value of the frequency of acid-base change and the complexity of acid-base change at each moment.

[0017] Preferably, the method for obtaining the decontamination effect evaluation value at each moment is as follows:

[0018] Arrange the COD content and turbidity of each moment and all its local neighboring moments in chronological order to form the short-term COD vector and short-term turbidity vector of each moment;

[0019] Respectively obtain the downward trend degree of the COD content and the downward trend degree of the turbidity at each moment according to the change trends of the elements in the short-term COD vector and short-term turbidity vector;

[0020] The average value of the downward trend degree of the COD content and the downward trend degree of the turbidity at each moment is the decontamination effect evaluation value at each moment.

[0021] Preferably, the method for obtaining the downward trend degree of the COD content and the downward trend degree of the turbidity at each moment is as follows:

[0022] Take the mean value of the absolute values of all negative elements in the first-order difference vector of the short-term COD vector as the downward trend degree of the COD content at each moment, and take the mean value of the absolute values of all negative elements in the first-order difference vector of the short-term turbidity vector as the downward trend degree of the turbidity at each moment.

[0023] Preferably, the calculation method of the comprehensive effect monitoring value of hydrolysis acidification at each moment is as follows:

[0024] ; where is the comprehensive effect monitoring value of hydrolysis acidification at the current moment, is the exponential function with the natural constant as the base, is the organic matter conversion intensity at the current moment, is the sewage removal effect evaluation value at the current moment, is the positive correlation coefficient between the conversion intensity vector and the sewage removal evaluation vector at the current moment, where the organic matter conversion intensities and sewage removal effect values at all moments within a preset time period before the current moment are arranged in chronological order to form the conversion intensity vector and the sewage removal evaluation vector at the current moment.

[0025] Preferably, the method for obtaining the positive correlation coefficient is as follows:

[0026] Statistical Pearson correlation coefficient of the conversion intensity vector and the sewage removal evaluation vector at the current moment, and take the sum of 1 and the Pearson correlation coefficient as the positive correlation coefficient between the conversion intensity vector and the sewage removal evaluation vector at the current moment.

[0027] Preferably, the end moment of controlling the hydrolysis acidification of ferulic acid production wastewater further includes: when the comprehensive effect monitoring value of hydrolysis acidification is less than the preset monitoring threshold, end the hydrolysis acidification of ferulic acid production wastewater.

[0028] The embodiment of the present application also provides a wastewater treatment system in the process of extracting natural ethyl ferulate, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of the wastewater treatment method in the process of extracting natural ethyl ferulate described in any one of the above.

[0029] As can be seen from the above, the wastewater treatment method and system in the process of extracting natural ethyl ferulate provided by the present application at least have the following beneficial effects:

[0030] By analyzing the acidity and alkalinity during the hydrolysis and acidification process of converting macromolecular organic substances into small-molecule organic acids, the present application accurately measures the conversion intensity characteristics of macromolecular organic substances during the hydrolysis and acidification process, enabling more effective identification of the progress of hydrolysis and acidification of ferulic acid production wastewater, facilitating more intuitive and effective improvement of the biodegradability characteristics of ferulic acid production wastewater, and avoiding serious impacts on the subsequent biochemical treatment effect of ferulic acid production wastewater.

[0031] The present application combines the changes in organic pollution and turbidity in ferulic acid production wastewater to accurately evaluate the decontamination effect during the hydrolysis and acidification process. By combining the decontamination effect and the conversion intensity characteristics of macromolecular organic substances during the hydrolysis and acidification process, a deep analysis of the comprehensive effect during the hydrolysis and acidification process is carried out. Thus, by real-time monitoring the comprehensive treatment effect of hydrolysis and acidification, the end time of hydrolysis and acidification is accurately judged, achieving more effective improvement of the biodegradability of production wastewater and more effective removal of suspended solids and organic substances in production wastewater.

[0032] Meanwhile, the present application determines the time to end the hydrolysis and acidification of ferulic acid production wastewater by real-time monitoring the comprehensive effect monitoring value of hydrolysis and acidification at a specific moment, avoiding additional hydrolysis and acidification treatment costs and ineffective hydrolysis and acidification processes, thereby improving the treatment efficiency of ferulic acid production wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a step flowchart of a wastewater treatment method during the process of extracting natural ethyl ferulate provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to further elaborate on the technical means and effects adopted by the present application to achieve the intended invention purpose, the following, in combination with the drawings and preferred embodiments, details the specific implementation manners, structures, features, and effects of a wastewater treatment method and system during the process of extracting natural ethyl ferulate proposed according to the present application. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0036] Unless otherwise specified or limited, terms such as "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the article or device including the said element. Additionally, the term "and / or" used herein includes any and all combinations of one or more of the related listed items. All technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs.

[0037] The following specifically describes the specific solutions of a wastewater treatment method and system in the process of extracting ethyl ferulate provided by this application in conjunction with the accompanying drawings.

[0038] Please refer to Figure 1 , which shows a step flow chart of a wastewater treatment method in the process of extracting ethyl ferulate provided by an embodiment of this application, including the following steps:

[0039] Step 1: During the hydrolysis acidification treatment process, obtain the COD content, turbidity and pH value of the wastewater from ferulic acid production.

[0040] Using wheat bran as the raw material, after extracting ferulic acid from wheat bran by the traditional alkali hydrolysis method, collect the production wastewater after ferulic acid extraction to obtain the alkaline ferulic acid production wastewater after collection, and perform wastewater treatment on the ferulic acid production wastewater through the wastewater treatment unit to avoid pollution to the ecological environment caused by the discharge of ferulic acid production wastewater.

[0041] In this embodiment, the treatment scale of the ferulic acid production wastewater is 40 m³ / h, and the implementer can determine the treatment scale of the ferulic acid production wastewater according to the actual situation.

[0042] First, the alkaline ferulic acid production wastewater enters the alkaline wastewater tank. After evenly adjusting the water volume, it is lifted to the neutralization tank by a lift pump. By adding HCl solution to the neutralization tank, the pH value of the production wastewater is adjusted to the range of 6 - 9.

[0043] Further, the production wastewater after adjusting the pH value enters the coagulation tank. Add PAC and PAM to the production wastewater in the coagulation tank, and perform coagulation precipitation under the coagulation action of PAC and PAM. Solid-liquid separation is carried out in the sedimentation tank. The upper clear liquid is sent to the air flotation oil removal tank, and the solid sediment in the sedimentation tank is placed in the sludge tank.

[0044] Furthermore, the ferulic acid production wastewater in the air flotation oil removal tank is subjected to air flotation oil removal treatment by an air flotation device to obtain the ferulic acid production wastewater after air flotation oil removal treatment.

[0045] Furthermore, the ferulic acid production wastewater after air flotation oil removal treatment is subjected to hydrolysis acidification. During the hydrolysis acidification treatment process, the COD content, turbidity, and pH value in the ferulic acid production wastewater are collected by an online COD sensor, a turbidimeter, and a water quality pH detector. The collection time interval is 30 s for each, and the COD content, turbidity, and pH value at each moment during the hydrolysis acidification process of the ferulic acid production wastewater are obtained respectively. In the actual application scenario, the implementer can set the data collection time interval by himself.

[0046] Step 2: According to the change situation of the pH value in the ferulic acid production wastewater, obtain the frequency of acid-base change at each moment. Combine the degree of chaos of the pH value change and the degree of fluctuation of the change frequency to obtain the complexity of acid-base change at each moment. Through the frequency of acid-base change and the complexity of acid-base change, obtain the conversion intensity of organic matter at each moment.

[0047] During the hydrolysis acidification process, the high-molecular organic matter with low solubility or insoluble in the ferulic acid wastewater will continuously transform into small-molecule substances with simple structures such as acetic acid, butyric acid, and propionic acid, resulting in unstable fluctuation changes in the pH value of the ferulic acid production wastewater. The more obvious the unstable fluctuation change of the pH value is, to a certain extent, it indicates that the high-molecular organic matter that is difficult to be directly utilized by microorganisms is continuously transforming into small-molecule substances, and the higher the treatment effect on the biodegradability of the ferulic acid wastewater, the more conducive to the subsequent biochemical treatment of the ferulic acid production wastewater.

[0048] Through the above analysis, the T moments with the closest time intervals to each moment are recorded as the T local neighboring moments of each moment. The vector composed of the pH values of each moment and all its local neighboring moments in chronological order is recorded as the short-term acidity-base vector of each moment. In this embodiment, the number T of local neighboring moments takes a value of 20, and the implementer can select the value of the number T according to the actual situation.

[0049] When the ferulic acid production wastewater is subjected to hydrolysis acidification, the higher the conversion intensity during the process of high-molecular organic matter transforming into small-molecule organic acids, the more frequent the change of acidity-base in the ferulic acid production wastewater at this time. At the same time, due to the diversity of small-molecule organic acids after transformation, the acidity-base in the ferulic acid production wastewater is prone to fluctuating changes with higher complexity.

[0050] In order to analyze the conversion intensity characteristics of high-molecular organic substances during the hydrolysis acidification process, calculate the first-order difference vector of the short-term pH vector at the t-th moment. The magnitude of the data in the first-order difference vector reflects the change magnitude of the pH in the production wastewater of ferulic acid during the local time period at this moment. Count the frequencies of the elements in the first-order difference vector of the short-term pH vector. If the pH change is greater at this time and the frequency corresponding to the magnitude of the pH change is higher, it can better reflect the characteristic of frequent pH changes. Therefore, for the t-th moment, calculate the absolute value of the product of each element in the first-order difference vector of the short-term pH vector and its frequency, and record the sum of all the calculated absolute values as the pH change frequency at the t-th moment. The pH change frequency reflects the frequent characteristic of the pH change during the conversion of high-molecular organic substances;

[0051] Meanwhile, if the uncertainty and randomness of the pH change information in the production wastewater of ferulic acid during the local time period of a moment are higher, and the frequencies corresponding to the pH changes are more inconsistent, it can better reflect the complex fluctuation characteristic of the pH during the conversion of small-molecular organic acids. Therefore, in this embodiment, also taking the t-th moment as an example, calculate the information entropy of all elements in the first-order difference vector of the short-term pH vector, and the standard deviation of the frequencies corresponding to the elements in the first-order difference vector of the short-term pH vector, and record the product of the information entropy and the standard deviation as the pH change complexity at the t-th moment. It should be noted that the pH change complexity reflects the complex characteristic of the pH change during the conversion of high-molecular organic substances.

[0052] Since high-molecular organic substances will continuously convert into small-molecular organic acids during the hydrolysis acidification process, and the converted small-molecular organic acids have the characteristic of diversity, the pH will show relatively frequent and relatively complex changes during this process. Therefore, record the mean value of the pH change frequency and the pH change complexity as the organic matter conversion intensity at the t-th moment. The organic matter conversion intensity reflects the intensity characteristic of the conversion of high-molecular organic substances into small-molecular organic acids during the hydrolysis acidification process, can effectively identify the progress of the hydrolysis acidification, and more effectively improve the biodegradability characteristic of the production wastewater of ferulic acid.

[0053] Step 3: Combine the decreasing trends of the COD content and turbidity in the production wastewater of ferulic acid to obtain the decontamination effect evaluation value at each moment.

[0054] Generally, during the hydrolysis acidification process of ferulic acid production wastewater, low-soluble or insoluble high-molecular organic substances will continuously transform into highly soluble small-molecular substances, causing obvious changes in the turbidity and COD content of the ferulic acid production wastewater during the hydrolysis acidification process. In order to make the hydrolysis acidification treatment more effectively improve the biodegradability of the production wastewater and more effectively remove the suspended solids and organic substances in the production wastewater, it is necessary to analyze the COD content and turbidity characteristics of the ferulic acid production wastewater.

[0055] Furthermore, the vectors formed by arranging the COD content and turbidity at each moment and all its local neighboring moments in chronological order are respectively denoted as the short-term COD vector and short-term turbidity vector at each moment.

[0056] Generally, if the downward trend characteristics of the COD content and turbidity in the ferulic acid production wastewater at a certain moment are more significant, it can better indicate that the hydrolysis acidification process at this time has a higher wastewater treatment effect. At this time, the hydrolysis acidification treatment of the ferulic acid production wastewater should be continued to more effectively remove the suspended solids and organic substances in the production wastewater.

[0057] Through the above analysis, the first-order difference vectors of the short-term COD vector and short-term turbidity vector at the t-th moment are calculated respectively. The mean value of the absolute values of all negative elements in the first-order difference vector of the short-term COD vector is denoted as the downward trend degree of the COD content at the t-th moment. Correspondingly, the mean value of the absolute values of all negative elements in the first-order difference vector of the short-term turbidity vector is denoted as the downward trend degree of the turbidity at the t-th moment. The mean value of the downward trend degree of the COD content and the downward trend degree of the turbidity is denoted as the decontamination effect evaluation value at the t-th moment. The decontamination effect value reflects the decontamination effect of the hydrolysis acidification process on the ferulic acid production wastewater. If the downward trend characteristics of the COD content and turbidity at a certain moment during the hydrolysis acidification process are more significant, it can better indicate that there is a better decontamination effect at this time, and the hydrolysis acidification treatment of the ferulic acid production wastewater should be continued.

[0058] Step 4: Utilize the correlation between the organic matter conversion intensity and the decontamination effect evaluation value at multiple moments before each moment, and combine the organic matter conversion intensity and the decontamination effect evaluation value at each moment to obtain the comprehensive effect monitoring value of the hydrolysis acidification at each moment.

[0059] During the hydrolysis acidification process of ferulic acid production wastewater, the traditional biochemical treatment process cannot accurately and adaptively adjust the treatment time of hydrolysis acidification. If the hydrolysis acidification process can still achieve a high organic matter conversion and decontamination effect, but the hydrolysis acidification of the ferulic acid production wastewater is ended at this time, it will not be able to effectively improve the biodegradability of the production wastewater and will not be able to effectively remove the suspended solids and organic substances in the production wastewater.

[0060] Meanwhile, during the hydrolysis acidification treatment process, poorly soluble high-molecular organic substances will be converted into small-molecular organic acids with good solubility, which can remove suspended substances and organic pollutants in the wastewater from ferulic acid production to a certain extent. Therefore, there is a strong positive correlation between the characteristics of organic matter conversion intensity and the sewage removal effect during the hydrolysis acidification process. If the positive correlation between the two during the current local time period is higher, and the organic matter conversion intensity and sewage removal effect are better, it can better reflect the comprehensive treatment effect of hydrolysis acidification at this time, and the hydrolysis acidification of the wastewater from ferulic acid production should not be ended at this time; on the contrary, if it is more difficult to reflect the comprehensive treatment effect of hydrolysis acidification at this time, it indicates that the biodegradability of the wastewater from ferulic acid production after hydrolysis acidification is relatively strong, and the removal of suspended substances and organic matter in the wastewater from ferulic acid production during the hydrolysis acidification process approaches the optimal state, and the hydrolysis acidification of the wastewater from ferulic acid production can be ended at this time.

[0061] Furthermore, vectors composed of the organic matter conversion intensity and sewage removal effect values corresponding to all times within a preset time period before the current time in chronological order are respectively denoted as the conversion intensity vector and the sewage removal evaluation vector during the hydrolysis acidification at the current time. In this embodiment, the preset time period is 30 minutes. Further, calculate the correlation degree between the conversion intensity vector and the sewage removal evaluation vector at the current time. The measurement method of the correlation degree can be covariance or Pearson correlation coefficient, which is not specifically limited in this embodiment. In this embodiment, the Pearson correlation coefficient is selected to measure the correlation degree.

[0062] Furthermore, in this embodiment, the correlation degree is non-negatively processed, and the sum of 1 and the Pearson correlation coefficient is denoted as the positive correlation coefficient between the conversion intensity vector and the sewage removal evaluation vector at the current time. The larger the positive correlation coefficient, the higher the positive correlation between the two during the current local time period, the better the comprehensive effect of the hydrolysis acidification on the wastewater from ferulic acid production at this time, and the less likely it is to end the hydrolysis acidification of the wastewater from ferulic acid production.

[0063] Through the above analysis, in this embodiment, for the current time, according to the positive correlation coefficient between the conversion intensity vector and the sewage removal evaluation vector at the current time, combined with the organic matter conversion intensity and the sewage removal effect evaluation value at the current time, calculate the comprehensive effect monitoring value of the hydrolysis acidification at the current time:

[0064] ; where is the comprehensive effect monitoring value of the hydrolysis acidification at the current time, is the exponential function with the natural constant as the base, is the positive correlation coefficient between the conversion intensity vector and the sewage removal evaluation vector at the current time, is the organic matter conversion intensity at the current time, is the decontamination effect evaluation value at the current moment.

[0065] Among them, the comprehensive effect monitoring value reflects the comprehensive effect of hydrolytic acidification of ferulic acid production wastewater. The comprehensive effect of hydrolytic acidification includes improving the biodegradability of ferulic acid production wastewater and removing suspended substances and organic pollutants in ferulic acid production wastewater. By real-time monitoring the comprehensive effect during the hydrolytic acidification process, the larger the comprehensive effect monitoring value of hydrolytic acidification, the more it indicates that the biodegradability of the production wastewater can be continuously improved at this time, and the suspended substances and organic pollutants in the production wastewater can be continuously removed; on the contrary, the smaller the comprehensive effect monitoring value of hydrolytic acidification, the more it indicates that the biodegradability of the production wastewater cannot be continuously improved at this time, and the suspended substances and organic pollutants in the production wastewater cannot be continuously removed, and the treatment of ferulic acid production wastewater approaches the optimal treatment state. At this time, the hydrolytic acidification of ferulic acid production wastewater should be ended to avoid continued investment in additional treatment costs and at the same time avoid an ineffective hydrolytic acidification process, thereby improving the treatment efficiency of ferulic acid production wastewater.

[0066] Step 5: Control the end time of the hydrolytic acidification of ferulic acid production wastewater through the comprehensive effect monitoring value, and then perform biochemical treatment, secondary coagulation sedimentation, and solid sedimentation treatment.

[0067] In order to accurately and adaptively adjust the treatment time of hydrolytic acidification, during the hydrolytic acidification of ferulic acid production wastewater, the comprehensive effect monitoring value of hydrolytic acidification at the real-time monitoring moment is monitored. When the comprehensive effect monitoring value of hydrolytic acidification is less than the preset monitoring threshold, it indicates that the biodegradability of the production wastewater cannot be continuously improved at this time, and the suspended substances and organic pollutants in the production wastewater cannot be continuously removed, representing that the treatment of ferulic acid production wastewater approaches the optimal treatment state. At this time, the hydrolytic acidification of ferulic acid production wastewater is ended, and the hydrolytic acidified ferulic acid production wastewater is subjected to the next step of biochemical treatment. Among them, the preset monitoring threshold is set by the implementer according to the actual application scenario. In this embodiment, the value is 0.5.

[0068] Further, the hydrolytic acidified ferulic acid production wastewater enters a biological contact oxidation tank, adopting a biofilm method that combines the activated sludge method and a biological filter. A large number of microorganisms attached to the high-efficiency biological filler are used to degrade the organic matter, emulsified grease, and surfactant in the wastewater into carbon dioxide and water to complete the biochemical treatment of ferulic acid production wastewater.

[0069] Further, the ferulic acid production wastewater after biochemical treatment enters a coagulation tank, where PAM and PAC are added to form flocs, and final solid-liquid separation is carried out in a sedimentation tank. The purified water after solid-liquid separation is discharged after meeting the standards, and the solid sediment after solid-liquid separation is placed in a sludge tank. The solid sediment in the sludge tank is successively subjected to plate-and-frame pressure filtration and sludge outsourcing disposal to achieve the wastewater treatment of ferulic acid production wastewater.

[0070] Based on the same inventive concept as the above method, an embodiment of the present application further provides a wastewater treatment system in the process of extracting ethyl ferulate, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any one of the above wastewater treatment methods in the process of extracting ethyl ferulate.

[0071] It can be understood that: the above sequence of embodiments of the present application is only for description and does not represent the advantages or disadvantages of the embodiments. And the above specific embodiments of the present specification have been described. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0072] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0073] The above content is only the implementation mode of the present application and is not used to limit the scope of the present application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the protection scope of the present application.

Claims

1. A wastewater treatment method in the process of extracting ethyl ferulate, characterized in that, It includes the following steps: During the hydrolysis acidification treatment process, obtain the COD content, turbidity, and pH value of the wastewater from ferulic acid production; According to the change situation of the pH value in the wastewater from ferulic acid production, obtain the frequency of acid-base change at each moment. Combine the degree of chaos and the fluctuation degree of the change frequency of the pH value to obtain the complexity of acid-base change at each moment. Through the frequency of acid-base change and the complexity of acid-base change, obtain the intensity of organic matter conversion at each moment; Combine the downward trend of the COD content and turbidity in the wastewater from ferulic acid production to obtain the evaluation value of the sewage removal effect at each moment; Utilize the correlation relationship between the intensity of organic matter conversion and the evaluation value of the sewage removal effect at multiple moments before each moment, and combine the intensity of organic matter conversion and the evaluation value of the sewage removal effect at each moment to obtain the comprehensive effect monitoring value of hydrolysis acidification at each moment; Control the end moment of the hydrolysis acidification of the wastewater from ferulic acid production through the comprehensive effect monitoring value, and then perform biochemical treatment, secondary coagulation sedimentation, and solid sedimentation treatment.

2. The wastewater treatment method in the process of extracting ethyl ferulate as claimed in claim 1, characterized in that, The method for obtaining the frequency of acid-base change at each moment is as follows: Take the T moments with the closest time interval to each moment as the local neighboring moments of each moment, and form the short-term pH vector of each moment by arranging the pH values of each moment and all its local neighboring moments in chronological order; Count the frequencies of the elements in the first-order difference vector of the short-term pH vector, calculate the absolute value of the product of each element in the first-order difference vector of the short-term pH vector of each moment and its frequency, and take the sum of all the calculated absolute values as the frequency of acid-base change at each moment.

3. A method for treating wastewater in a process of extracting natural ethyl ferulate as claimed in claim 2, characterized in that: The method for obtaining the complexity of acid-base change at each moment is as follows: Calculate the information entropy of all elements in the first-order difference vector of the short-term pH vector and the standard deviation of the corresponding frequencies of the elements in the first-order difference vector of the short-term pH vector, and record the product of the information entropy and the standard deviation as the complexity of acid-base change at the t-th moment.

4. The method for treating wastewater in the process of extracting natural ethyl ferulate according to claim 1, wherein: The intensity of organic matter conversion at each moment is the average of the frequency of acid-base change and the complexity of acid-base change at each moment.

5. The wastewater treatment method in the process of extracting ethyl ferulate as described in claim 2, characterized in that The method for obtaining the evaluation value of the sewage removal effect at each moment is as follows: Arrange the COD content and turbidity of each moment and all its local neighboring moments in chronological order to form the short-term COD vector and short-term turbidity vector of each moment; Respectively obtain the downward trend degree of the COD content and the downward trend degree of the turbidity at each moment according to the change trends of the elements in the short-term COD vector and short-term turbidity vector; The average of the downward trend degree of the COD content and the downward trend degree of the turbidity at each moment is the evaluation value of the sewage removal effect at each moment.

6. The wastewater treatment method in the process of extracting ethyl ferulate as claimed in claim 5, characterized in that, The method for obtaining the downward trend degree of the COD content and the downward trend degree of the turbidity at each moment is as follows: Take the average value of the absolute values of all negative elements in the first-order difference vector of the short-term COD vector as the downward trend degree of the COD content at each moment, and take the average value of the absolute values of all negative elements in the first-order difference vector of the short-term turbidity vector as the downward trend degree of the turbidity at each moment.

7. The method for treating wastewater in the process of extracting natural ethyl ferulate according to claim 1, wherein: The calculation method for the comprehensive effect monitoring value of hydrolysis acidification at each moment is as follows: ; wherein, is the monitoring value of the comprehensive effect of hydrolysis acidification at the current moment, is the exponential function with the natural constant as the base, is the intensity of organic matter conversion at the current moment, is the evaluation value of the pollution removal effect at the current moment, is the positive correlation coefficient between the conversion intensity vector and the pollution removal evaluation vector at the current moment, wherein the organic matter conversion intensity and the pollution removal effect values at all moments within the preset time period before the current moment are arranged in chronological order to form the conversion intensity vector and the pollution removal evaluation vector at the current moment respectively.

8. The waste water treatment method in the process of extracting ethyl ferulate as claimed in claim 7, characterized in that, The method for obtaining the positive correlation coefficient is as follows: Calculate the Pearson correlation coefficient between the conversion intensity vector and the decontamination evaluation vector at the current moment, and use the sum of 1 and the Pearson correlation coefficient as the positive correlation coefficient between the conversion intensity vector and the decontamination evaluation vector at the current moment.

9. The wastewater treatment method in the process of extracting ethyl ferulate as claimed in claim 1, characterized in that The end time of controlling the hydrolysis acidification of ferulic acid production wastewater further includes: when the comprehensive effect monitoring value of hydrolysis acidification is less than the preset monitoring threshold, end the hydrolysis acidification of ferulic acid production wastewater.

10. A wastewater treatment system for extracting natural ethyl ferulate, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, it implements the steps of the wastewater treatment method in the process of extracting natural ethyl ferulate according to any one of claims 1-9.

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