CN117886636B - Method for fermenting liquid fertilizer based on vegetable organic waste - Google Patents

Abstract

The invention relates to the technical field of fermented fertilizers, and particularly provides a method for fermenting a liquid fertilizer based on vegetable organic waste, which comprises the following steps: collecting the size data of the pollutant attachment area and the vegetable organic waste; judging whether to perform cleaning operation or not, and determining crushing treatment time; dividing the first slurry to be treated and the second slurry to be treated, carrying out anaerobic fermentation on the first slurry to be treated, collecting a liquid-to-liquid ratio, determining fermentation time, judging whether fermentation is complete or not according to a concentration change rate, and finally obtaining fermentation liquor; adding the fermentation liquor and the second slurry to be treated into a container for hydrothermal reaction, and judging whether to adjust the stirring rate according to the maximum difference value; based on the infrared imaging, detecting the COD content H in the container, comparing the COD content H with a COD content threshold Hmin, and judging whether the hydrothermal reaction is finished; finally, the liquid fertilizer is obtained. The invention realizes the efficient and intelligent treatment of the vegetable organic waste, improves the utilization efficiency of resources and reduces the environmental pollution.

Description

Method for fermenting liquid fertilizer based on vegetable organic waste

Technical Field

The invention relates to the technical field of fermented fertilizers, in particular to a method for fermenting a liquid fertilizer based on vegetable organic wastes.

Background

With the improvement of living standard of people, the demand for vegetables is continuously increased, so that the vegetable planting area and yield of China are steadily improved. Meanwhile, wastes generated in the links of harvesting, processing, storing, transporting and the like of vegetables are also increasing continuously. Vegetable organic waste contains a large amount of water and organic substances, if improperly treated, the vegetable organic waste is easy to rot, deteriorate and breed pests, generate toxic and harmful gases, even spread diseases, and seriously harm the ecological environment and human health.

The conventional treatment method comprises direct returning, aerobic composting, anaerobic fermentation and the like, but has the problems of high treatment cost, complex operation, poor product quality, easiness in causing secondary pollution and the like, and is difficult to popularize. At present, some methods utilize microbial agents or complex enzymes to treat the tail vegetables, but the problems of complex operation, long time consumption, residual microbial agents or complex enzymes of products and the like exist. For example, hydrothermal treatment is a method of dissolving a hardly soluble or insoluble substance in a system by heating, pressurizing or the like. The vegetable organic waste can effectively release nutrient substances in the vegetable organic waste by utilizing the hydrothermal treatment, and the macromolecular organic substances are converted into small molecular organic substances which are easy to be absorbed and utilized by plants. However, the prior art still has problems such as the need of adding extra alkaline substances, high cost, obvious influence on the operation process due to human experience, and large difference of the quality of reaction products due to lack of a feedback regulator.

Therefore, there is a need to devise a method for fermenting liquid fertilizers based on vegetable organic waste to solve the problems in the prior art.

Disclosure of Invention

In view of the above, the invention provides a method for fermenting liquid fertilizer based on vegetable organic waste, which aims to solve the problems that the current vegetable organic waste treatment process is complex, the cost is high, the traditional hydrothermal reaction is easily affected by manual operation, and the quality difference of reaction products is large due to lack of a feedback regulation mechanism.

The invention provides a method for fermenting a liquid fertilizer based on vegetable organic waste, which comprises the following steps:

collecting image data of vegetable organic waste, and analyzing the image data to obtain pollutant attachment area and size data of the vegetable organic waste;

Judging whether to carry out cleaning operation according to the pollutant attachment area, and determining crushing treatment time according to the size data;

Dividing crushed vegetable organic waste into first to-be-treated pulp and second to-be-treated pulp, placing the first to-be-treated pulp into a fermentation kettle for anaerobic fermentation, collecting the feed liquid ratio of the first to-be-treated pulp at the beginning of the anaerobic fermentation, determining fermentation time according to the feed liquid ratio, collecting the concentration of carbon dioxide in the fermentation time, obtaining the concentration change rate of the carbon dioxide at the end point according to the concentration of the carbon dioxide after the fermentation time is over, judging whether fermentation is complete according to the concentration change rate, and filtering to obtain fermentation liquor after the complete fermentation is judged;

Adding the fermentation liquor and the second slurry to be treated into a container for hydrothermal reaction, and determining reaction conditions and stirring rate, wherein the reaction conditions comprise heating temperature and heating time, collecting real-time temperatures of a plurality of positions in the container, obtaining temperature gradients according to the real-time temperatures, obtaining the maximum difference value in the temperature gradients, judging whether to adjust the stirring rate according to the maximum difference value, and obtaining the adjusted stirring rate;

After the adjusted stirring rate is obtained and the heating time is over, detecting the COD content (Chemical Oxygen Demand chemical oxygen demand) in the container based on infrared imaging, marking the COD content as H, comparing the COD content H with a preset COD content threshold Hmin, and judging whether to end the hydrothermal reaction according to a comparison result;

and after the hydrothermal reaction is judged to be finished, filtering and squeezing the product to obtain the liquid fertilizer.

Further, the determining whether to perform the cleaning operation according to the contaminant adhering area includes:

comparing the pollutant attachment area M with a preset area threshold Mmax, and judging whether to perform cleaning operation according to the comparison result;

When M is larger than Mmax, judging to perform cleaning operation, and obtaining an area difference delta M between the pollutant attachment area M and an area threshold value Mmax, wherein delta M=M-Mmax;

when M is less than or equal to Mmax, it is determined that the cleaning operation is not performed.

Further, when it is determined to perform the cleaning operation, it includes:

Comparing the area difference delta M with a first preset area difference delta M1 and a second preset area difference delta M2 which are preset respectively, wherein delta M1 is smaller than delta M2, and determining the cleaning duration according to the comparison result;

When ΔM is less than or equal to ΔM1, determining the cleaning duration as a first preset cleaning duration Tq1;

when Δm1 is less than Δm2 and is less than or equal to Δm2, determining the cleaning duration to be a second preset cleaning duration Tq2;

when Δm2 < Δm, determining the cleaning duration as a third preset cleaning duration Tq3;

Wherein, tq1 is more than 0 and Tq2 is more than 3.

Further, when determining the crushing processing time according to the size data, the method includes:

obtaining a maximum volume Vmax and a minimum volume Vmin in the vegetable organic waste according to the size data, obtaining a volume ratio V according to the maximum volume Vmax and the minimum volume Vmin, wherein V=Vmax/Vmin, and determining the crushing treatment time according to the volume ratio V;

When V is more than or equal to 3, determining the crushing treatment time as a first preset crushing treatment time Ts1;

when the V is more than 3 and is more than or equal to 2, determining the crushing treatment time as a second preset crushing treatment time Ts2;

when the V is more than 2 and is more than or equal to 1, determining the crushing treatment time as a third preset crushing treatment time Ts3;

wherein, ts1 > Ts2 > Ts 3> 0.

Further, collecting the feed liquid ratio of the first slurry to be treated, and determining the fermentation time according to the feed liquid ratio, wherein the method comprises the following steps:

judging whether evaporation water removal is carried out or not according to the feed liquid ratio N of the first slurry to be treated;

when the ratio of the liquid to the solid is not more than 1/10 and N, judging that evaporation and water removal are not performed, and determining fermentation time according to the liquid-to-solid ratio N;

when N is less than 1/10, determining to evaporate and remove water until N is more than or equal to 1/10, and determining fermentation time according to the feed liquid ratio N;

Comparing the feed liquid ratio N with a preset first preset feed liquid ratio N1 and a preset second feed liquid ratio N2 respectively, wherein N1 is more than or equal to 1/10 and less than N2, and determining fermentation time according to the comparison result;

when N is more than or equal to 1/10 and less than N1, determining the fermentation time as a first preset fermentation time Tj1;

when N1 is less than or equal to N2, determining the fermentation time as a second preset fermentation time Tj2;

When N2 is less than or equal to N, determining the fermentation time as a third preset fermentation time Tj3;

Wherein, 0 is more than Tj1 is more than Tj2 and less than Tj3.

Further, after determining that the fermentation time is the i-th preset fermentation time Tji, i=1, 2,3, when the concentration change rate of the carbon dioxide at the end point moment is obtained according to the concentration of the carbon dioxide after the fermentation time is over, judging whether the fermentation is complete according to the concentration change rate, including:

When the concentration change rate of the carbon dioxide is larger than zero, judging that fermentation is still performed after the fermentation time Tji is over, and prolonging the fermentation time according to the concentration change rate D;

and when the concentration change rate of the carbon dioxide is less than or equal to zero, judging that fermentation is stopped after the fermentation time Tji is over, and completely fermenting.

Further, when it is determined that the fermentation time is prolonged according to the concentration change rate D, it includes:

Comparing the concentration change rate D with a preset first preset concentration change rate D1 and a preset second concentration change rate D2 respectively, wherein D1 is smaller than D2, and determining the prolonged fermentation time according to the comparison result;

when D is less than or equal to D1, a first preset time adjustment coefficient A1 is selected to adjust the fermentation time Tji, and the adjusted time Tji A1 is taken as the prolonged fermentation time;

When D1 is more than D and less than or equal to D2, selecting a second preset time adjustment coefficient A2 to adjust the fermentation time Tji, and taking the adjusted time Tji A2 as the prolonged fermentation time;

When D2 is less than D, selecting a third preset time adjustment coefficient A3 to adjust the fermentation time Tji, and taking the adjusted time Tji A3 as the prolonged fermentation time;

Wherein A1 is more than 0 and A2 is more than 0 and A3 is more than 1.

Further, judging whether to adjust the stirring rate according to the maximum difference value, and when obtaining the adjusted stirring rate, the method includes:

Comparing the maximum difference C with a difference threshold Cmax, and judging whether to adjust the stirring rate J according to the comparison result;

When C > Cmax, determining to adjust the stirring rate J, and obtaining a difference variable delta C between the maximum difference C and a difference threshold Cmax, wherein delta C=C-Cmax;

when C is less than or equal to Cmax, it is determined that the stirring rate J is not adjusted, and the stirring rate J is taken as the adjusted stirring rate Jt, that is, jt=j.

Further, when it is determined to adjust the stirring rate J, it includes:

Comparing the difference variable delta C with a first preset difference variable delta C1 and a second preset difference variable delta C2 which are preset respectively, wherein delta C1 is smaller than delta C2, and adjusting the stirring rate J according to the comparison result to obtain the adjusted stirring rate Jt;

When Δc is less than or equal to Δc1, selecting a first preset rate adjustment coefficient B1 to adjust the stirring rate J, and obtaining an adjusted stirring rate Jt, where jt=jxb1;

When Δc1 is smaller than Δc and smaller than or equal to Δc2, selecting a second preset rate adjustment coefficient B2 to adjust the stirring rate J, and obtaining an adjusted stirring rate Jt, where jt=jxb2;

When Δc2 is less than Δc, selecting a third preset rate adjustment coefficient B3 to adjust the stirring rate J, and obtaining an adjusted stirring rate Jt, where jt=jxb3;

Wherein, B1 is more than 1 and B2 is more than 2 and B3 is more than 1.2.

Further, comparing the COD content H with a preset COD content threshold Hmin, and judging whether to end the hydrothermal reaction according to the comparison result, wherein the method comprises the following steps:

when H is smaller than Hmin, judging that the hydrothermal reaction is ended;

When H is more than or equal to Hmin, judging that the hydrothermal reaction is not ended, collecting pressure data Y in a container, and adjusting the pressure data Y according to a content difference delta H between the COD content H and a COD content threshold value Hmin, wherein delta H=H-Hmin, and carrying out the hydrothermal reaction on the adjusted pressure data until the COD content meets H < Hmin;

Comparing the content difference delta H with a preset first preset content difference delta H1 and a preset second content difference delta H2 respectively, wherein delta H1 is smaller than delta H2, and adjusting the pressure data Y according to the comparison result;

When delta H is less than or equal to delta H1, a first preset pressure adjustment coefficient Q1 is selected to adjust the pressure data Y, and adjusted pressure data Y is obtained;

When delta H1 is less than delta H and less than or equal to delta H2, selecting a second preset pressure adjustment coefficient Q2 to adjust the pressure data Y, and obtaining adjusted pressure data Y x Q2;

when delta H2 is less than delta H, selecting a third preset pressure adjustment coefficient Q3 to adjust the pressure data Y, and obtaining adjusted pressure data Y.Q 3;

wherein Q1 is more than 1 and Q2 is more than 1.5, and Q3 is more than 1.

Compared with the prior art, the invention has the beneficial effects that: by comprehensively utilizing image data analysis and real-time data acquisition, the efficient treatment of the vegetable organic waste is realized. Through the analysis of the image data, the pollutant attachment area and size data of the waste can be accurately obtained, so that whether the cleaning operation is needed or not is judged, the crushing treatment time is determined, and the treatment efficiency and the treatment accuracy are improved. In the anaerobic fermentation stage, the fermentation time is determined by utilizing the feed liquid ratio and the carbon dioxide concentration data acquired in real time, and meanwhile, whether the fermentation is complete or not is judged by monitoring the carbon dioxide concentration change rate, so that the fermentation process is effectively controlled, and the fermentation efficiency and the product quality are improved. In the hydrothermal reaction stage, the stirring rate is adjusted by judging the maximum difference value by utilizing real-time temperature data and temperature gradient, so that the intelligent regulation of the reaction condition is realized, and the reaction efficiency and the energy utilization rate are improved. The COD content in the container is detected based on the infrared imaging technology and compared with a preset threshold value, so that the accurate judgment of the end time of the hydrothermal reaction is realized, and the product quality and the process stability are ensured. The efficient and intelligent treatment of the vegetable organic waste is realized, the resource utilization efficiency is improved, and the environmental pollution is reduced.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 is a flowchart of a method for fermenting a liquid fertilizer based on vegetable organic waste according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

Along with the improvement of the living standard of people and the increase of the vegetable demands, the vegetable planting scale and the vegetable yield in China are continuously increased, however, at the same time, the organic wastes generated in the production and processing processes of vegetables are continuously accumulated. These wastes mainly contain vegetable roots, stems, leaves, trays, etc., and contain a large amount of moisture and organic substances. If these wastes are not properly treated, they are liable to cause decay and deterioration, and the harmful gases and even the diseases are generated, which brings serious threat to the ecological environment and human health.

The treatment methods commonly used at present comprise direct field returning, aerobic composting, anaerobic fermentation and the like. However, these methods have problems such as high treatment cost, complex operation, poor product quality, easy secondary pollution, etc., and thus are difficult to popularize and apply on a large scale. In recent years, some methods for treating the tail vegetables by utilizing microbial agents or complex enzymes are proposed, but the methods have the defects of complicated operation, long time consumption and certain limitation that the microbial agents or complex enzymes possibly remain in products. The hydrothermal treatment is used as a potential treatment technology, and waste vegetable organic matters are dissolved in a heating, pressurizing and other modes, so that nutrient substances in the waste vegetable organic matters are effectively released, and macromolecular organic matters are converted into micromolecular organic matters which are easy to be absorbed and utilized by plants. However, during the hydrothermal treatment, it is generally necessary to add an alkaline substance (such as sodium hydroxide) to promote the progress of the reaction. This adds to the cost and introduces additional chemicals that tend to impact the quality and environment of the final product. And current hydrothermal treatment techniques often rely on the experience and skill level of the operator. Due to the lack of an intelligent control system, operators need to adjust the process parameters according to their own experience, resulting in instability of the process results and differences in product quality. Meanwhile, an effective feedback regulation mechanism is lacking, and self-adaptive regulation cannot be performed according to real-time reaction conditions. This means that parameter settings or operating strategies cannot be corrected in time during processing, exacerbating the inconsistencies and instabilities in the product quality during the reaction. In view of these problems in the prior art, it is necessary to devise a method for fermenting liquid fertilizer based on vegetable organic waste that solves the limitations in the prior art.

Referring to fig. 1, the embodiment provides a method for fermenting a liquid fertilizer based on vegetable organic waste, which comprises the following steps:

s100: image data of the vegetable organic waste is collected, and the image data is analyzed to obtain the pollutant attachment area and the size data of the vegetable organic waste.

S200: judging whether to perform cleaning operation according to the pollutant attachment area, and determining the crushing treatment time according to the size data.

S300: the method comprises the steps of dividing crushed vegetable organic waste into first to-be-treated pulp and second to-be-treated pulp, placing the first to-be-treated pulp into a fermentation kettle for anaerobic fermentation, collecting the feed liquid ratio of the first to-be-treated pulp at the beginning of the anaerobic fermentation, determining fermentation time according to the feed liquid ratio, collecting carbon dioxide concentration in the fermentation time, obtaining the concentration change rate of carbon dioxide at the end point moment according to the carbon dioxide concentration after the fermentation time is over, judging whether fermentation is complete according to the concentration change rate, and filtering to obtain fermentation liquor after the complete fermentation is judged.

S400: adding the fermentation liquor and the second slurry to be treated into a container for hydrothermal reaction, and determining reaction conditions and stirring speed, wherein the reaction conditions comprise heating temperature and heating time, collecting real-time temperatures of a plurality of positions in the container, obtaining temperature gradients according to the real-time temperatures, obtaining the maximum difference value in the temperature gradients, judging whether to adjust the stirring speed according to the maximum difference value, and obtaining the adjusted stirring speed.

S500: and after the adjusted stirring rate is obtained and the heating time is over, detecting the COD content in the container based on infrared imaging, marking the COD content as H, comparing the COD content H with a preset COD content threshold Hmin, and judging whether the hydrothermal reaction is over or not according to the comparison result.

S600: and after finishing the hydrothermal reaction, filtering and squeezing the product to obtain the liquid fertilizer.

Specifically, the vegetable organic waste is photographed using a digital camera or an image pickup device in S100. Ensuring that the image sharpness and resolution are sufficient for subsequent image processing. The collected images are preprocessed, including noise removal, brightness adjustment, contrast adjustment and other operations, so that the accuracy and stability of subsequent image analysis are improved. The image is analyzed by using an image processing algorithm, and the pollutant attachment area on the surface of the vegetable organic waste is identified and quantified. Image analysis techniques include threshold segmentation, edge detection, region growing, and the like. The image processing algorithm is also utilized to carry out boundary detection or object segmentation on the vegetable organic waste in the image, so as to acquire the size data, such as length, width, height and the like. And outputting the analyzed pollutant attachment area and the size data of the vegetable organic waste as digital parameters.

Specifically, in S200, a threshold is set according to the size of the contamination adhering area, and when the contamination adhering area exceeds the threshold, it is determined that the cleaning operation is required. According to the size data of the vegetable organic waste, the crushing treatment time is determined, so that the waste can be fully crushed and the treatment requirement is met. In S300, the crushed vegetable organic waste is divided into a first slurry to be treated and a second slurry to be treated. Wherein the ratio of the first slurry to be treated to the second slurry to be treated is 1:9. and (3) placing the first slurry to be treated into a fermentation kettle for anaerobic fermentation. And when the anaerobic fermentation is carried out, an anaerobic environment in the reaction kettle is maintained, the influence of other strains on the anaerobic fermentation is reduced, and when the fermentation is started, the feed-liquid ratio of the first slurry to be treated is collected. And determining fermentation time according to the feed-liquid ratio, and collecting the change condition of the concentration of carbon dioxide in the fermentation time. And judging whether the fermentation is complete according to the change rate of the concentration of the carbon dioxide after the fermentation time is over, and filtering to obtain fermentation liquor if the fermentation is complete. And S400, adding the fermentation liquor and the second slurry to be treated into a container for hydrothermal reaction. The reaction was carried out with stirring rate according to the preset reaction conditions (heating temperature 230 to 270 ℃ C. For 45 min). The real-time temperatures at several locations within the vessel are collected and the temperature gradient and maximum difference therein are calculated. Judging whether the stirring rate needs to be adjusted according to the maximum temperature difference value. The reactants are scanned using an infrared imaging device and the infrared spectral image of the surface is recorded in S500. And importing the data acquired by the infrared imaging equipment into computer software for processing and analysis. And determining an estimated value of the COD content in the sample by comparing the infrared spectrogram image of the sample with the COD content model. Before the infrared imaging equipment is used for scanning, the equipment is required to be corrected, and the influence of hydrothermal reaction on the detection result is avoided. And detecting the COD content in the container based on infrared imaging, comparing the COD content with a preset COD content threshold value, and judging whether the hydrothermal reaction is ended or not according to the comparison result. If the COD content meets the expectations, the reaction is ended. And S600, after finishing the hydrothermal reaction, filtering and squeezing the product to obtain a liquid fertilizer product.

It can be appreciated that in S100, the image processing technology is utilized to accurately obtain the pollutant attachment area and size data of the waste, which is beneficial to avoiding the problems of complex operation and larger error in the conventional method. In S200, whether the cleaning operation is needed or not is intelligently judged according to the size of the pollutant attachment area and the size data of the waste, so that the resource waste and the energy consumption in the cleaning process are effectively avoided. In S300 and S400, fermentation and hydrothermal reaction technologies are adopted to convert organic substances in the waste into liquid fertilizer, so that the problems of secondary pollution and high treatment cost in the traditional treatment method are avoided. In S500, the COD content is rapidly detected by utilizing an infrared imaging technology, so that the real-time monitoring and control of the hydrothermal reaction process are realized, and the stability of the reaction and the controllability of the product quality are improved. Realizes the efficient treatment of the vegetable organic waste, and is beneficial to solving the problems of high cost, complex operation, poor product quality and the like in the traditional treatment method.

In some embodiments of the present application, determining whether to perform a cleaning operation based on the contaminant attachment area includes: and comparing the pollutant attachment area M with a preset area threshold Mmax, and judging whether to perform cleaning operation according to the comparison result.

Specifically, when M > Mmax, it is determined that the cleaning operation is performed, and an area difference Δm of the contamination adhering area M from the area threshold Mmax is obtained, Δm=m-Mmax. When M is less than or equal to Mmax, it is determined that the cleaning operation is not performed.

It will be appreciated that the contaminant attachment area is obtained by image processing techniques and represents the size of the area of contaminant attached to the surface of the waste. The preset area threshold is a preset standard value and is used for judging the critical value of the pollution degree of the surface of the waste. The size relationship of the contaminant attachment area and the area threshold, i.e., the size of M and Mmax, is compared to determine whether a cleaning operation is performed. When the pollutant attachment area is larger than the preset area threshold value, the cleaning operation is judged to be needed, and the cleaning operation is determined to be further optimized according to the area difference delta M. And if the pollutant attachment area is smaller than or equal to the preset area threshold value, judging that the cleaning operation is not needed. The intelligent evaluation and the processing decision of the pollutant attachment area are realized, and whether the cleaning operation is needed or not is judged in a quantitative mode, so that the artificial judgment with strong subjectivity and possible errors in the traditional processing method are avoided. By introducing the intelligent judging mechanism in the embodiment, the efficiency and accuracy of waste treatment can be effectively improved, so that the waste of resources and the consumption of energy sources are reduced, and the treatment cost is reduced.

In some embodiments of the application, when it is determined to perform a cleaning operation, it includes: and respectively comparing the area difference delta M with a first preset area difference delta M1 and a second preset area difference delta M2 which are preset, wherein delta M1 is smaller than delta M2, and determining the cleaning duration according to the comparison result.

Specifically, when Δm is equal to or less than Δm1, the cleaning duration is determined to be the first preset cleaning duration Tq1. When Δm1 < Δm+.DELTA.m2, the cleaning duration is determined to be the second preset cleaning duration Tq2. When Δm2 < Δm, the cleaning duration is determined to be a third preset cleaning duration Tq3. Wherein, tq1 is more than 0 and Tq2 is more than 3.

It will be appreciated that the area difference Δm is the difference between the contaminant adhering area and a predetermined area threshold, reflecting the degree of contamination of the waste surface. The first preset area difference value Δm1 and the second preset area difference value Δm2 are two thresholds set in advance according to different stages or requirements of the cleaning operation, and are used for distinguishing waste with different pollution degrees and determining the duration of the cleaning operation. In an embodiment, the cleaning durations of the different phases are determined according to the magnitude relation of the area differences Δm and Δm1 and Δm2, respectively, wherein Tq1 corresponds to a slightly contaminated situation, tq2 corresponds to a moderately contaminated situation, and Tq3 corresponds to a severely contaminated situation. The method realizes the cleaning operation of different durations for wastes with different pollution degrees, and has more refined and intelligent cleaning treatment strategies. The cleaning duration is dynamically adjusted according to the preset area difference threshold, so that the waste with different pollution degrees can be more accurately adapted, and the cleaning efficiency and the resource utilization rate are improved. The intelligent cleaning duration setting mode effectively solves the problems of fixed cleaning operation, poor cleaning effect and the like in the background technology, and has remarkable technical innovation and practical value.

It will be appreciated that by determining different cleaning times for different levels of pollution, the moisture content of the waste can be better controlled. For slightly polluted wastes, relatively short cleaning time is adopted, so that surface pollutants can be effectively removed, and meanwhile, the absorption of moisture is reduced as much as possible. While for heavily contaminated waste, a longer cleaning time is required to thoroughly remove the contaminants, care must be taken to control the cleaning time to avoid excessive moisture absorption. Too high a water content may not only affect the fermentation and the hydrothermal reaction, but may also lead to dilution of the fermentation or reaction solution, affecting the quality and purity of the product. The water content of the waste is effectively controlled by dynamically adjusting the cleaning time, so that the subsequent fermentation and the hydrothermal reaction can be smoothly carried out. Not only can the treatment efficiency be improved, but also the quality and stability of the product can be ensured.

In some embodiments of the application, determining the crushing processing time from the size data comprises: and obtaining the maximum volume Vmax and the minimum volume Vmin in the vegetable organic waste according to the size data, obtaining the volume ratio V according to the maximum volume Vmax and the minimum volume Vmin, and determining the crushing treatment time according to the volume ratio V, wherein V=Vmax/Vmin.

Specifically, when V is not less than 3, the crushing treatment time is determined to be a first preset crushing treatment time Ts1. When 3 is more than V and is more than or equal to 2, determining the crushing treatment time as a second preset crushing treatment time Ts2. When 2 is more than V and is more than or equal to 1, determining the crushing treatment time as a third preset crushing treatment time Ts3. Wherein, ts1 > Ts2 > Ts3 > 0.

It will be appreciated that in the waste treatment process, determining the appropriate time for the disruption treatment ensures that the waste is sufficiently disrupted and the efficiency of the treatment is improved. The size data, especially the maximum volume and the minimum volume, of the vegetable organic waste are obtained, the volume ratio is calculated, and the crushing treatment time is determined according to the volume ratio, so that the purpose of dynamically adjusting the crushing treatment time is realized. When the volume ratio V is 3 or more, it means that the size difference of the waste is large, and a long crushing treatment time is required to ensure that the waste is completely crushed. When the volume ratio V is between 2 and 3, the size difference of the waste is moderate, so that the crushing treatment time with medium length is set. When the volume ratio V is smaller than 1, the size of the waste is relatively uniform, and the crushing can be completed only by a short crushing treatment time. By dynamically adjusting the crushing treatment time according to the size difference of the waste, excessive or insufficient crushing is effectively avoided, and the utilization rate and the treatment efficiency of the waste are improved. The method realizes flexible adjustment according to the actual condition of the waste, avoids the problem that the waste is not fully crushed or excessively crushed possibly caused by the traditional fixed treatment time, thereby improving the quality and efficiency of waste treatment and reducing the treatment cost.

In some embodiments of the present application, collecting a feed-to-liquid ratio of a first slurry to be treated, and determining a fermentation time based on the feed-to-liquid ratio, comprises: judging whether evaporation water removal is carried out or not according to the feed liquid ratio N of the first slurry to be treated.

Specifically, when 1/10 is less than or equal to N, it is judged that evaporation water removal is not performed and fermentation time is determined according to the feed liquid ratio N. When N is less than 1/10, determining to evaporate and remove water until N is more than or equal to 1/10, and determining fermentation time according to the feed liquid ratio N.

Specifically, the feed liquid ratio N is respectively compared with a first preset feed liquid ratio N1 and a second preset feed liquid ratio N2 which are preset, N1 is more than or equal to 1/10 and less than N2, and fermentation time is determined according to the comparison result. When N is more than or equal to 1/10 and less than N1, determining the fermentation time as a first preset fermentation time Tj1. When N1 is less than or equal to N2, determining the fermentation time as a second preset fermentation time Tj2. And when N2 is less than or equal to N, determining the fermentation time as a third preset fermentation time Tj3. Wherein, 0 is more than Tj1 is more than Tj2 and less than Tj3.

It can be understood that whether evaporation water removal is needed or not is judged by collecting the feed liquid ratio N of the first slurry to be treated. When the feed liquid ratio N is more than or equal to 1/10, the water content of the waste is in a proper range, evaporation and water removal are not needed, and the fermentation time is directly determined according to the feed liquid ratio N. When the feed-liquid ratio N is less than 1/10, the water content of the waste is too high, evaporation and dehydration are needed to reach proper water content, and then the fermentation time is determined according to the feed-liquid ratio after dehydration. And comparing according to the preset first and second preset feed liquid ratios N1 and N2, and determining fermentation time under different conditions. When the feed liquid ratio N is smaller than N1, a shorter fermentation time is adopted to cope with the situation of higher water content. When the feed-liquid ratio N is between N1 and N2, a fermentation time of moderate length is adopted. When the feed liquid ratio N is equal to or greater than N2, a longer fermentation time is used to cope with the case where the solid content is large. The liquor ratio refers to the ratio of solids to liquid in the slurry, i.e., the solids content.

It is understood that the content of solid waste during fermentation has a significant impact on the efficiency and quality of fermentation. When the feed liquid is relatively high, the content of the solid waste is relatively high, which means that the concentration of nutrients, organic matters and other nutrient substances in the waste is relatively high. Fermentation is a biochemical reaction process of microorganisms under the action of organic matters, and in this embodiment, weissella is a majority of strains, and the microorganisms grow and reproduce by using the organic matters as carbon sources. Therefore, the solid waste contains more organic substances, provides more carbon sources and nutrient substances, is beneficial to the growth and propagation of microorganisms, and promotes the fermentation. When the feed liquid is low, the content of solid waste is relatively low, the concentration of organic matters is low, the carbon sources and nutrient substances which can be utilized by microorganisms are low, and the fermentation speed and efficiency are correspondingly reduced. According to the material-liquid ratio, different fermentation time is selected, the fermentation time is regulated according to the content of organic matters in the solid waste, and microorganisms can fully utilize the organic matters, so that the fermentation efficiency and the product quality are improved. The higher the feed to liquid ratio, the higher the organic content in the organic waste, thus requiring longer fermentation time to ensure sufficient time for the microorganisms to grow and reproduce, thereby completing the efficient treatment and conversion of the waste.

In some embodiments of the present application, after determining that the fermentation time is the i-th preset fermentation time Tji, i=1, 2,3, when the concentration change rate of carbon dioxide at the end point time is obtained according to the concentration of carbon dioxide after the fermentation time is over, determining whether the fermentation is complete according to the concentration change rate includes:

Specifically, the carbon dioxide concentration change rate measured at the end of the fermentation time is the carbon dioxide concentration change rate at the end of the fermentation time. When the concentration change rate of the carbon dioxide is larger than zero, the fermentation is still carried out after the fermentation time Tji is judged to be ended, the fermentation is incomplete, and the fermentation time is prolonged according to the concentration change rate D. When the concentration change rate of the carbon dioxide is less than or equal to zero, the fermentation is stopped after the fermentation time Tji is judged to be ended, and the fermentation is completed.

In some embodiments of the application, when it is determined to extend the fermentation time according to the concentration change rate D, it includes: and respectively comparing the concentration change rate D with a preset first preset concentration change rate D1 and a preset second concentration change rate D2, wherein D1 is smaller than D2, and determining the prolonged fermentation time according to the comparison result.

Specifically, when D is less than or equal to D1, a first preset time adjustment coefficient A1 is selected to adjust the fermentation time Tji, and the adjusted time tji×a1 is used as the extended fermentation time. When D1 is more than D and less than or equal to D2, a second preset time adjustment coefficient A2 is selected to adjust the fermentation time Tji, and the adjusted time Tji is A2 as the prolonged fermentation time. When D2 is smaller than D, a third preset time adjustment coefficient A3 is selected to adjust the fermentation time Tji, and the adjusted time Tji is A3 as the prolonged fermentation time. Wherein A1 is more than 0 and A2 is more than 0 and A3 is more than 1.

It is understood that after determining the fermentation time as the ith preset fermentation time Tji, whether the fermentation has been completely performed is judged by monitoring the concentration change rate of carbon dioxide during the fermentation. After the fermentation time is over, if the concentration change rate of the carbon dioxide is greater than zero, the fermentation is still performed, and the fermentation is not complete, at this time, the fermentation time is prolonged according to the concentration change rate D to ensure that the fermentation is completely performed. And when the concentration change rate of the carbon dioxide is less than or equal to zero, the fermentation is stopped, and the fermentation process is complete without prolonging the fermentation time.

It will be appreciated that the detection of carbon dioxide may generally be accomplished by a sensor or gas detection instrument. During fermentation, microorganisms decompose organic waste and produce gases such as carbon dioxide as metabolites. The rate of carbon dioxide production is low at the beginning of the fermentation process and increases gradually over time as microbial activity increases. When the fermentation process reaches an equilibrium state, the activity of microorganisms is slowed down and the rate of carbon dioxide production tends to stabilize. Therefore, by monitoring the rate of change of carbon dioxide concentration with time, the activity state of the microorganism and the progress of the fermentation process are indirectly reflected. When the rate of change of the carbon dioxide concentration is positive, it means that the rate of carbon dioxide production is still increasing, indicating that the fermentation process is still underway. And when the rate of change of the carbon dioxide concentration approaches zero or is negative, it indicates that the rate of carbon dioxide production has slowed or stopped, indicating that the fermentation process has been completed. Therefore, by monitoring the rate of change of the carbon dioxide concentration, it is judged whether the fermentation has been completed. Thereby avoiding the problems caused by insufficient or overlong fermentation time and ensuring the full utilization and efficient performance of the fermentation process. The stability and the controllability of the fermentation process are improved, and the problem that the fermentation process cannot be accurately controlled in the traditional method is effectively solved, so that the efficiency and the quality of waste treatment are improved.

In some embodiments of the present application, determining whether to adjust the stirring rate according to the maximum difference value, when obtaining the adjusted stirring rate includes: and comparing the maximum difference C with a difference threshold Cmax, and judging whether to adjust the stirring rate J according to the comparison result.

Specifically, when C > Cmax, it is determined that the stirring rate J is adjusted, and a difference variable Δc of the maximum difference C from the difference threshold Cmax is obtained, Δc=c-Cmax. When C is less than or equal to Cmax, it is determined that the stirring rate J is not adjusted, and the stirring rate J is taken as the adjusted stirring rate Jt, that is, jt=j.

It can be understood that whether the stirring rate needs to be adjusted is determined by comparing the maximum difference value of the temperature gradient with a preset difference threshold value according to the temperature data monitored in real time. The maximum difference C actually monitored is compared with a preset difference threshold Cmax. If the maximum difference C exceeds the difference threshold Cmax, which indicates a large change in temperature gradient, the stirring rate needs to be adjusted to enhance temperature uniformity. At this time, the stirring rate is adjusted, and a difference variable Δc, which is the difference between the actual maximum difference and the threshold, is calculated. If the maximum difference C does not reach or equal to the difference threshold Cmax, it indicates that the change of the temperature gradient is small, and the stirring rate does not need to be adjusted, and the current stirring rate is used as the adjusted stirring rate. By dynamically adjusting the stirring rate, the uniformity of the reaction system is maintained in response to temperature change in time, so that the reaction rate and the product quality are improved, and the problems of incomplete reaction or unstable product quality caused by uneven temperature are avoided.

In some embodiments of the application, when it is determined to adjust the stirring rate J, it includes: and respectively comparing the difference variable delta C with a first preset difference variable delta C1 and a second preset difference variable delta C2, wherein delta C1 is smaller than delta C2, and adjusting the stirring rate J according to the comparison result to obtain an adjusted stirring rate Jt.

Specifically, when Δc is less than or equal to Δc1, a first preset rate adjustment coefficient B1 is selected to adjust the stirring rate J, and an adjusted stirring rate Jt is obtained, where jt=jxb1. When Δc1 is smaller than Δc and smaller than or equal to Δc2, selecting a second preset rate adjustment coefficient B2 to adjust the stirring rate J, and obtaining an adjusted stirring rate Jt, wherein jt=jxb2. When Δc2 is less than Δc, a third preset rate adjustment coefficient B3 is selected to adjust the stirring rate J, and an adjusted stirring rate Jt is obtained, where jt=jxb3. Wherein, B1 is more than 1 and B2 is more than 2 and B3 is more than 1.2.

It can be appreciated that the difference variable deltac monitored in real time is compared with a preset difference threshold to determine whether the stirring rate needs to be adjusted. And comparing the delta C with two preset difference thresholds delta C1 and delta C2 to determine the coefficient of the adjustment rate. The stirring state of the reaction system can be timely adjusted according to the change condition of the temperature gradient by dynamically adjusting the stirring speed, so that the reaction uniformity is maintained, and the reaction speed and the product quality are improved. The gradual increase of the preset rate adjustment coefficients B1, B2 and B3 ensures different responses to different degrees of temperature gradient change, so that stirring rate adjustment is more flexible and accurate, and the problems of low reaction efficiency, unstable product quality and the like caused by uneven temperature in the traditional technology are effectively solved.

In some embodiments of the present application, comparing the COD content H with a preset COD content threshold Hmin, and judging whether to end the hydrothermal reaction according to the comparison result includes: and when H is smaller than Hmin, judging that the hydrothermal reaction is ended. When H is more than or equal to Hmin, judging that the hydrothermal reaction is not ended, collecting pressure data Y in the container, and adjusting the pressure data Y according to the content difference delta H between the COD content H and the COD content threshold value Hmin, wherein delta H=H-Hmin, so that the hydrothermal reaction is carried out on the adjusted pressure data until the COD content meets H < Hmin.

Specifically, the content difference Δh is compared with a first preset content difference Δh1 and a second preset content difference Δh2, Δh1 is smaller than Δh2, and the pressure data Y is adjusted according to the comparison result. When ΔH is less than or equal to ΔH21, a first preset pressure adjustment coefficient Q1 is selected to adjust the pressure data Y, and adjusted pressure data Y×Q1 is obtained. When Δh1 is smaller than Δh2 and is smaller than Δh2, selecting a second preset pressure adjustment coefficient Q2 to adjust the pressure data Y, and obtaining adjusted pressure data y×q2. When Δh2 is smaller than Δh, a third preset pressure adjustment coefficient Q3 is selected to adjust the pressure data Y, and adjusted pressure data y×q3 is obtained. Wherein Q1 is more than 1 and Q2 is more than 1.5, and Q3 is more than 1.

It can be understood that the organic matter content is stable when the hydrothermal reaction is relatively complete. As the hydrothermal reaction proceeds, the organic matter gradually degrades into smaller organic molecules, thereby reducing the COD content in the solution. Therefore, when the COD content is lower than the content threshold Hmin, it is determined that the hydrothermal reaction has completed degradation of most of the organic substances. When the COD content is high, the reaction pressure is adjusted to influence the composition and the solubility of the gas phase in the solution, so that the degradation rate of the organic substances is influenced. When the COD content does not reach the preset condition for ending the hydrothermal reaction, the pressure is adjusted to change the reaction environment, and nitrogen is added into the container to promote the further degradation of the organic substances so as to meet the quality requirement. If the hydrothermal reaction is continued without adjusting the reaction conditions, organic substances may accumulate during the reaction, resulting in that the COD content at the end point of the reaction may not reach the desired level. By adjusting the pressure, the reaction environment is changed, and the degradation rate of organic substances is improved, so that the accumulation of the organic substances is avoided, and the quality of a final product is ensured.

In the embodiment, the high-efficiency treatment of the vegetable organic waste is realized by comprehensively utilizing the image data analysis and the real-time data acquisition. Through the analysis of the image data, the pollutant attachment area and size data of the waste can be accurately obtained, so that whether the cleaning operation is needed or not is judged, the crushing treatment time is determined, and the treatment efficiency and the treatment accuracy are improved. In the anaerobic fermentation stage, the fermentation time is determined by utilizing the feed liquid ratio and the carbon dioxide concentration data acquired in real time, and meanwhile, whether the fermentation is complete or not is judged by monitoring the carbon dioxide concentration change rate, so that the fermentation process is effectively controlled, and the fermentation efficiency and the product quality are improved. In the hydrothermal reaction stage, the stirring rate is adjusted by judging the maximum difference value by utilizing real-time temperature data and temperature gradient, so that the intelligent regulation of the reaction condition is realized, and the reaction efficiency and the energy utilization rate are improved. The COD content in the container is detected based on the infrared imaging technology and compared with a preset threshold value, so that the accurate judgment of the end time of the hydrothermal reaction is realized, and the product quality and the process stability are ensured. The efficient and intelligent treatment of the vegetable organic waste is realized, the resource utilization efficiency is improved, and the environmental pollution is reduced.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims (8)

1. A method for fermenting a liquid fertilizer based on vegetable organic waste, comprising:

collecting image data of vegetable organic waste, and analyzing the image data to obtain pollutant attachment area and size data of the vegetable organic waste;

Judging whether to carry out cleaning operation according to the pollutant attachment area, and determining crushing treatment time according to the size data;

Dividing crushed vegetable organic waste into first to-be-treated pulp and second to-be-treated pulp, placing the first to-be-treated pulp into a fermentation kettle for anaerobic fermentation, collecting the feed liquid ratio of the first to-be-treated pulp at the beginning of the anaerobic fermentation, determining fermentation time according to the feed liquid ratio, collecting the concentration of carbon dioxide in the fermentation time, obtaining the concentration change rate of the carbon dioxide at the end point according to the concentration of the carbon dioxide after the fermentation time is over, judging whether fermentation is complete according to the concentration change rate, and filtering to obtain fermentation liquor after the complete fermentation is judged;

Adding the fermentation liquor and the second slurry to be treated into a container for hydrothermal reaction, and determining reaction conditions and stirring rate, wherein the reaction conditions comprise heating temperature and heating time, collecting real-time temperatures of a plurality of positions in the container, obtaining a temperature gradient according to the real-time temperatures, obtaining the maximum difference value in the temperature gradient, and judging whether the fermentation liquor is subjected to the hydrothermal reaction or not according to the maximum difference value

The stirring rate is adjusted, and the adjusted stirring rate is obtained;

When the adjusted stirring rate is obtained and the heating time is over, detecting the COD content in the container based on infrared imaging, marking the COD content as H, comparing the COD content H with a preset COD content threshold Hmin, and judging whether to end the hydrothermal reaction according to the comparison result;

After the hydrothermal reaction is judged to be finished, filtering and squeezing a product to obtain a liquid fertilizer;

The step of judging whether to perform the cleaning operation according to the pollutant attachment area includes:

comparing the pollutant attachment area M with a preset area threshold Mmax, and judging whether to perform cleaning operation according to the comparison result;

When M is larger than Mmax, judging to perform cleaning operation, and obtaining an area difference delta M between the pollutant attachment area M and an area threshold value Mmax, wherein delta M=M-Mmax;

When M is less than or equal to Mmax, judging that the cleaning operation is not performed;

when it is determined to perform the washing operation, it includes:

Comparing the area difference delta M with a first preset area difference delta M1 and a second preset area difference delta M2 which are preset respectively, wherein delta M1 is smaller than delta M2, and determining the cleaning duration according to the comparison result;

When ΔM is less than or equal to ΔM1, determining the cleaning duration as a first preset cleaning duration Tq1;

when Δm1 is less than Δm2 and is less than or equal to Δm2, determining the cleaning duration to be a second preset cleaning duration Tq2;

when Δm2 < Δm, determining the cleaning duration as a third preset cleaning duration Tq3;

Wherein, tq1 is more than 0 and Tq2 is more than 3.

2. The method for fermenting a liquid fertilizer based on vegetable organic waste according to claim 1, wherein determining the time for the crushing treatment based on the size data comprises:

obtaining a maximum volume Vmax and a minimum volume Vmin in the vegetable organic waste according to the size data, obtaining a volume ratio V according to the maximum volume Vmax and the minimum volume Vmin, wherein V=Vmax/Vmin, and determining the crushing treatment time according to the volume ratio V;

when V is more than or equal to 3, determining the crushing treatment time as a first preset crushing treatment time Ts1; when the V is more than 3 and is more than or equal to 2, determining the crushing treatment time as a second preset crushing treatment time Ts2;

when the V is more than 2 and is more than or equal to 1, determining the crushing treatment time as a third preset crushing treatment time Ts3;

wherein, ts1 > Ts2 > Ts 3> 0.

3. The method for fermenting a liquid fertilizer based on vegetable organic waste according to claim 1, wherein the step of collecting the feed liquid ratio of the first slurry to be treated and determining the fermentation time based on the feed liquid ratio comprises:

judging whether evaporation water removal is carried out or not according to the feed liquid ratio N of the first slurry to be treated;

when the ratio of the liquid to the solid is not more than 1/10 and N, judging that evaporation and water removal are not performed, and determining fermentation time according to the liquid-to-solid ratio N;

when N is less than 1/10, determining to evaporate and remove water until N is more than or equal to 1/10, and determining fermentation time according to the feed liquid ratio N;

Comparing the feed liquid ratio N with a preset first preset feed liquid ratio N1 and a preset second feed liquid ratio N2 respectively, wherein N1 is more than or equal to 1/10 and less than N2, and determining fermentation time according to the comparison result;

when N is more than or equal to 1/10 and less than N1, determining the fermentation time as a first preset fermentation time Tj1;

when N1 is less than or equal to N2, determining the fermentation time as a second preset fermentation time Tj2;

When N2 is less than or equal to N, determining the fermentation time as a third preset fermentation time Tj3;

Wherein, 0 is more than Tj1 is more than Tj2 and less than Tj3.

4. A method for fermenting a liquid fertilizer based on vegetable organic waste according to claim 3, wherein after determining the fermentation time as the i-th preset fermentation time Tji, i=1, 2,3, when the concentration change rate of the carbon dioxide at the end point time is obtained according to the carbon dioxide concentration after the fermentation time is ended, determining whether the fermentation is complete according to the concentration change rate comprises:

When the concentration change rate of the carbon dioxide is larger than zero, judging that fermentation is still performed after the fermentation time Tji is over, and prolonging the fermentation time according to the concentration change rate D;

and when the concentration change rate of the carbon dioxide is less than or equal to zero, judging that fermentation is stopped after the fermentation time Tji is over, and completely fermenting.

5. The method for fermenting a liquid fertilizer based on vegetable organic waste according to claim 4, wherein when it is determined to lengthen the fermentation time according to the concentration change rate D, comprising:

Comparing the concentration change rate D with a preset first preset concentration change rate D1 and a preset second concentration change rate D2 respectively, wherein D1 is smaller than D2, and determining the prolonged fermentation time according to the comparison result;

when D is less than or equal to D1, a first preset time adjustment coefficient A1 is selected to adjust the fermentation time Tji, and the adjusted time Tji A1 is taken as the prolonged fermentation time;

When D1 is more than D and less than or equal to D2, selecting a second preset time adjustment coefficient A2 to adjust the fermentation time Tji, and taking the adjusted time Tji A2 as the prolonged fermentation time;

When D2 is less than D, selecting a third preset time adjustment coefficient A3 to adjust the fermentation time Tji, and taking the adjusted time Tji A3 as the prolonged fermentation time;

Wherein A1 is more than 0 and A2 is more than 0 and A3 is more than 1.

6. The method for fermenting a liquid fertilizer based on vegetable organic waste according to claim 1, wherein determining whether to adjust the stirring rate according to the maximum difference value, when obtaining the adjusted stirring rate, comprises:

Comparing the maximum difference C with a difference threshold Cmax, and judging whether to adjust the stirring rate J according to the comparison result;

When C > Cmax, determining to adjust the stirring rate J, and obtaining a difference variable delta C between the maximum difference C and a difference threshold Cmax, wherein delta C=C-Cmax; when C is less than or equal to Cmax, it is determined that the stirring rate J is not adjusted, and the stirring rate J is taken as the adjusted stirring rate Jt, that is, jt=j.

7. The method for fermenting a liquid fertilizer based on vegetable organic waste of claim 6, wherein when it is determined to adjust the stirring rate J, comprising:

Comparing the difference variable delta C with a first preset difference variable delta C1 and a second preset difference variable delta C2 which are preset respectively, wherein delta C1 is smaller than delta C2, and adjusting the stirring rate J according to the comparison result to obtain the adjusted stirring rate Jt;

When Δc is less than or equal to Δc1, selecting a first preset rate adjustment coefficient B1 to adjust the stirring rate J, and obtaining an adjusted stirring rate Jt, where jt=jxb1;

When Δc1 is smaller than Δc and smaller than or equal to Δc2, selecting a second preset rate adjustment coefficient B2 to adjust the stirring rate J, and obtaining an adjusted stirring rate Jt, where jt=jxb2;

When Δc2 is less than Δc, selecting a third preset rate adjustment coefficient B3 to adjust the stirring rate J, and obtaining an adjusted stirring rate Jt, where jt=jxb3;

Wherein, B1 is more than 1 and B2 is more than 2 and B3 is more than 1.2.

8. The method for fermenting a liquid fertilizer based on vegetable organic waste according to claim 7, wherein comparing the COD content H with a predetermined COD content threshold Hmin, and judging whether to end the hydrothermal reaction according to the comparison result comprises:

when H is smaller than Hmin, judging that the hydrothermal reaction is ended;

When H is more than or equal to Hmin, judging that the hydrothermal reaction is not ended, collecting pressure data Y in a container, and adjusting the pressure data Y according to a content difference delta H between the COD content H and a COD content threshold value Hmin, wherein delta H=H-Hmin, and carrying out the hydrothermal reaction on the adjusted pressure data until the COD content meets H < Hmin;

Comparing the content difference delta H with a preset first preset content difference delta H1 and a preset second content difference delta H2 respectively, wherein delta H1 is smaller than delta H2, and adjusting the pressure data Y according to the comparison result;

When delta H is less than or equal to delta H1, a first preset pressure adjustment coefficient Q1 is selected to adjust the pressure data Y, and adjusted pressure data Y is obtained;

When delta H1 is less than delta H and less than or equal to delta H2, selecting a second preset pressure adjustment coefficient Q2 to adjust the pressure data Y, and obtaining adjusted pressure data Y x Q2;

when delta H2 is less than delta H, selecting a third preset pressure adjustment coefficient Q3 to adjust the pressure data Y, and obtaining adjusted pressure data Y.Q 3;

wherein Q1 is more than 1 and Q2 is more than 1.5, and Q3 is more than 1.