Treatment method of degreasing wastewater chemical sludge

Abstract

The invention discloses a degreasing wastewater chemical sludge treatment method, which comprises the following steps: based on at least one preset decision judgment condition of chemical sludge generated by degreasing wastewater pretreatment, carrying out treatment path selection judgment on the chemical sludge of the current batch; according to a selection judgment result, guiding the chemical sludge and executing a corresponding treatment path; wherein the treatment paths at least comprise a first treatment path, a second treatment path and a third treatment path, in the second treatment path, the chemical sludge is sequentially subjected to concentration treatment, thermal-chemical coupling cracking treatment and solid-liquid separation treatment, and carbon-rich supernate and inert residues are obtained respectively; and recycling the carbon-rich supernate as an internal carbon source, dehydrating the inert residues, and transporting the dehydrated inert residues to the outside.

Description

Technical Field

[0001] This application relates to the field of industrial wastewater treatment technology, and more specifically, to an intelligent treatment method for chemical sludge generated during the pretreatment stage of degreasing wastewater from industries such as coating and machining. More specifically, this invention relates to a treatment method that uses dynamic decision-making based on real-time operating conditions and sludge characteristics to achieve an optimal balance between sludge reduction and resource utilization. Background Technology

[0002] In industrial production, degreasing wastewater is typically pretreated by adding coagulants and flocculants to remove grease and suspended solids. This process generates a large amount of chemical sludge, characterized by large fluctuations in organic matter content and poor dewatering performance. Currently, the mainstream treatment method is to dewater all the sludge and then transport it off-site for disposal.

[0003] However, this approach has significant drawbacks: First, the disposal costs are high, accounting for a significant portion of the total wastewater treatment cost; second, when the sludge contains a large amount of organic matter such as oils and surfactants, direct transportation means a waste of resources; third, degreasing wastewater has poor biodegradability, and its subsequent biological treatment systems (such as anoxic tanks for denitrification) often require the addition of commercial carbon sources such as methanol due to insufficient carbon sources, which increases operating costs.

[0004] While existing technologies have attempted to recover energy or carbon sources from sludge through anaerobic digestion or thermochemical treatment, these methods are typically designed as fixed processes, treating all sludge indiscriminately. This leads to two problems: first, when the organic matter content of the sludge is low, the energy consumption and cost-benefit ratio of the treatment process are inverted, resulting in poor economic efficiency; second, the produced carbon source is out of sync with the real-time needs of the biological system, potentially causing carbon waste or shock loads.

[0005] Therefore, there is an urgent need in this field for a treatment method that can intelligently judge and start on demand, and precisely couple sludge disposal with system requirements, so as to reduce disposal costs while achieving efficient and stable resource reuse. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a method for treating chemical sludge from degreasing wastewater. By introducing multi-dimensional decision-making, the method can automatically select the most economical and efficient treatment path based on the sludge's characteristics and the system's real-time requirements. This significantly reduces overall operating costs while ensuring treatment effectiveness and enables precise recovery and utilization of carbon sources.

[0007] In a first aspect, embodiments of this application provide a method for treating chemical sludge from degreasing wastewater, the method comprising: Based on at least one preset decision-making condition for the chemical sludge generated from the pretreatment of degreasing wastewater, the treatment path for the current batch of chemical sludge is selected and determined. Based on the result of the selection judgment, the chemical sludge is guided and the corresponding treatment path is executed; The processing path includes at least the following: First treatment path: The chemical sludge is dewatered and then transported off-site for disposal; The second treatment path involves sequentially concentrating the chemical sludge, performing thermo-chemical coupling decomposition treatment, and separating the solid and liquid components to obtain a carbon-rich supernatant and an inert residue. The carbon-rich supernatant is reused as an internal carbon source, and the inert residue is dehydrated and then transported off-site for disposal.

[0008] The decision-making conditions include the resource potential condition for judging the sludge resource utilization potential, the system carbon source demand condition for judging the system carbon source demand, and the sludge production quantity condition for judging the sludge production quantity.

[0009] Preferably, the decision-making criteria include an assessment of the sludge's potential for resource recovery; The assessment of the sludge resource utilization potential specifically includes: Obtain the characterization value of the organic matter content of the chemical sludge, and compare the characterization value of the organic matter content with a first set threshold. When the organic matter content characterization value is lower than the first set threshold, it is determined that the first processing path is selected.

[0010] Preferably, the organic matter content is characterized by the ratio of volatile suspended solids to total suspended solids in the chemical sludge.

[0011] For example, the first set threshold value ranges from 0.4 to 0.6.

[0012] Preferably, the decision-making conditions include a judgment on the system's carbon source requirements; The determination of the system's carbon source requirements specifically refers to: Obtain water quality parameters characterizing carbon source requirements in subsequent biochemical treatment units, and compare the water quality parameters with a second set threshold. When the water quality parameters indicate that a carbon source needs to be added, it is determined to be one of the conditions for selecting the second treatment path.

[0013] Preferably, the water quality parameter is the nitrate nitrogen concentration in an oxygen-deficient environment; when the nitrate nitrogen concentration is higher than the second set threshold, it is determined that a carbon source needs to be added.

[0014] Preferably, the decision-making criteria also include a judgment on the amount of sludge generated; The determination of sludge production volume specifically refers to: The chemical sludge production per unit time is obtained, and the production is compared with a third set threshold. When the output is lower than the third set threshold, it is determined that the first processing path is selected.

[0015] Preferably, in the second processing path, the specific conditions for the thermo-chemical coupling cracking process are preset based on the object.

[0016] Preferably, after obtaining carbon-rich supernatant by executing the second processing path, a carbon source storage step is further included: storing at least a portion of the carbon-rich supernatant in a preset container; and reusing the stored carbon-rich supernatant when a carbon source is subsequently determined to be needed based on the decision judgment conditions.

[0017] Preferably, the logic for the selection judgment is as follows: The second treatment path is selected only when the chemical sludge simultaneously meets the conditions for resource utilization potential and the system's carbon source requirements. If the chemical sludge does not meet any of the following conditions: resource potential, system carbon source requirements, or sludge production volume, then the first treatment path shall be selected.

[0018] Preferably, the steps of making the selection judgment and guiding the sludge to the corresponding treatment path according to the judgment result are executed by automatic control logic based on real-time data from online monitoring.

[0019] This invention relates to a method for treating chemical sludge from degreasing wastewater, which has the following beneficial effects: 1. Through intelligent judgment, only sludge with high resource value and system demand is subjected to advanced treatment, avoiding ineffective energy and reagent consumption of low-value sludge. At the same time, the recovered internal carbon source can directly replace commercial carbon source, significantly reducing overall operating costs from both "cost reduction" and "resource generation" perspectives, and lowering expenses related to sludge disposal and carbon source procurement.

[0020] 2. The production and reuse of carbon sources are strictly linked to the real-time needs of the biological system (such as denitrification needs), achieving "production on demand and precise addition." This effectively avoids the disruption of the downstream biological system caused by excessive carbon source addition, or the decline in denitrification efficiency caused by insufficient carbon source, thereby ensuring the long-term stable compliance of the final effluent water quality.

[0021] 3. The "resource potential assessment" in this application is equivalent to screening raw materials, ensuring that only high-quality raw materials enter the deep processing line, thereby improving the carbon source conversion efficiency per unit processing volume. At the same time, it avoids the equipment operating under inefficient or ineffective conditions, improving the equipment utilization rate and service life of the core processing unit.

[0022] 4. The entire decision-making and path switching process can be completed automatically based on online data, forming a closed-loop intelligent system integrating perception, analysis, decision-making, and execution. This greatly reduces the workload of operators and their reliance on experience, while improving management level and the reproducibility of the process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic flowchart illustrating a method for treating chemical sludge from degreasing wastewater, provided in an embodiment of this application; Figure 2 A flowchart illustrating the decision-making process; Figure 3 A flowchart illustrating the execution path. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0026] In the following description, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The following description provides multiple embodiments of this application, which can be substituted or combined with each other. Therefore, this application can also be considered to include all possible combinations of the same and / or different embodiments described. Thus, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then this application should also be considered to include embodiments containing one or more other possible combinations of A, B, C, and D, even if such embodiments are not explicitly described in the following text.

[0027] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the described elements without departing from the scope of this application. Various processes or components may be appropriately omitted, substituted, or added to the examples. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.

[0028] This application provides a method for treating chemical sludge from degreasing wastewater. Please refer to [link to relevant documentation]. Figure 1 In this embodiment of the application, the method includes: Based on at least one preset decision-making condition for the chemical sludge generated from the pretreatment of degreasing wastewater, the treatment path selection is determined for the current batch of chemical sludge. Based on the selection and judgment results, the chemical sludge will be guided and the corresponding treatment path will be executed; The processing path includes at least the following: First treatment path: Dewater the chemical sludge and then transport it off-site for disposal; The second treatment path involves sequentially concentrating the chemical sludge, performing thermo-chemical coupling decomposition treatment, and then separating the solid and liquid components to obtain a carbon-rich supernatant and an inert residue. The carbon-rich supernatant is reused as an internal carbon source, while the inert residue is dehydrated and transported off-site for disposal.

[0029] This application provides a method for treating chemical sludge from degreasing wastewater. By introducing multi-dimensional decision-making, it can automatically select the most economical and efficient treatment path based on the characteristics of the sludge itself and the system implementation requirements. This significantly reduces the overall operating cost while ensuring the treatment effect, and achieves precise recovery and utilization of carbon sources.

[0030] Based on the actual situation, the processing path includes at least two paths, one of which follows the traditional model, and the other is an advanced processing flow that includes concentration, thermo-chemical coupling cracking, and solid-liquid separation. This establishes a dual-path selection mechanism.

[0031] Of course, the status of the two treatment paths can be dynamically adjusted or combined, thereby achieving diverse path coordination methods and creating a third treatment path. For example, the first treatment path can be used to treat "surface" sludge with low resource potential, and then the second treatment path can be used to treat "deep" sludge with high resource potential; or other application forms based on actual needs.

[0032] Based on this, branch paths independent of the second processing path can be developed. Branch paths can be constructed by adding or removing processing methods or adjusting their order to solve practical needs.

[0033] In the embodiments of this application, the method begins with obtaining chemical sludge generated by the pretreatment unit. The key difference lies in the fact that the sludge is not directly sent to a single treatment line, but rather evaluated based on preset decision-making conditions. According to the evaluation results, the system directs the sludge to one of two distinct treatment paths: the first path follows the traditional model, i.e., direct dewatering and off-site transport, suitable for scenarios with no resource value or no system demand; the second path executes a deep treatment process including concentration, thermo-chemical coupling decomposition, and solid-liquid separation, aiming to convert the organic matter in the sludge into easily bioavailable carbon-rich supernatant (for reuse as an internal carbon source), while simultaneously obtaining a significantly reduced amount of inert residue. This design forms the basic framework of the method of this invention.

[0034] To intelligently determine whether sludge has resource value, this application introduces decision-making conditions for sludge resources. Multiple core decision-making conditions can be constructed based on preset dimensions. When dealing with a specific object, one or more of these core decision-making conditions are selected for judgment, such as... Figure 2 As shown, decision-making is based on three core decision conditions.

[0035] In one feasible embodiment, the assessment of the sludge resource utilization potential can be used as one of the core decision-making conditions, for example: The decision-making criteria include the assessment of the sludge's potential for resource recovery, i.e., the resource recovery potential criteria.

[0036] The assessment of the potential for sludge resource utilization is specifically as follows: Obtain the characterization value of organic matter content in chemical sludge and compare the characterization value of organic matter content with a first set threshold. When the organic matter content is lower than the first set threshold, the first processing path is selected.

[0037] The organic matter content is characterized by the ratio of volatile suspended solids to total suspended solids in chemical sludge.

[0038] Specifically, firstly, parameters characterizing the organic matter content in sludge are obtained through online monitoring or sampling analysis, namely, the "organic matter content characterization value." This value can indirectly reflect the potential of sludge to be converted into a carbon source after subsequent treatment. Preferably, the ratio of volatile suspended solids to total suspended solids is used as this characterization value, as it can directly distinguish between organic and inorganic components in sludge.

[0039] Then, the measured ratio is compared with a preset first threshold. This threshold can be an empirical value, ranging from 0.4 to 0.6, or adjusted and set based on actual needs. If the ratio is lower than this threshold, it indicates that the batch of sludge is mainly composed of inorganic matter, and the economics of deep resource recovery are poor. Therefore, the system decides to guide it to the first treatment path (direct dewatering and off-site transportation). This avoids wasting energy on processing materials with low value.

[0040] In one feasible embodiment, the determination of the system's carbon source demand can be used as one of the core decision-making conditions, for example: The decision-making conditions include the judgment of the system's carbon source demand, i.e., the system's carbon source demand conditions.

[0041] The specific determination of the system's carbon source requirements is as follows: Obtain water quality parameters characterizing carbon source requirements in subsequent biochemical treatment units, and compare the water quality parameters with a second set threshold. When water quality parameters indicate that a carbon source needs to be added, it is determined to be one of the conditions for selecting the second treatment path.

[0042] Among them, the water quality parameter is the nitrate nitrogen concentration in the anoxic environment; when the nitrate nitrogen concentration is higher than the second set threshold, it is determined that a carbon source needs to be added.

[0043] In the embodiments of this application, the linkage between resource recovery and production needs can be ensured based on the system's carbon source demand assessment. This assessment focuses on the status of subsequent biochemical treatment units (typically anoxic tanks).

[0044] The specific method involves acquiring water quality parameters that characterize carbon source requirements in the unit in real time. For example, for a system primarily targeting denitrification, nitrate nitrogen concentration is an ideal indicator. This real-time concentration value is compared with a preset second threshold (e.g., 5 mg / L). If the concentration exceeds the threshold, it indicates that the system currently lacks sufficient carbon source and requires replenishment, thus meeting one of the conditions for activating the second treatment pathway (carbon source production). This mechanism ensures that the produced carbon-rich supernatant can be utilized promptly and effectively, preventing product accumulation.

[0045] In one feasible embodiment, to optimize system operating efficiency, especially in response to low-load conditions, the determination of sludge production can be used as one of the core decision-making conditions, for example: The decision-making criteria also include the judgment of the amount of sludge produced, i.e., the sludge production condition.

[0046] The specific determination of sludge production is as follows: The chemical sludge production per unit time is obtained and compared with a third set threshold. When the output is lower than the third set threshold, the first processing path is selected.

[0047] In the embodiments of this application, the chemical sludge production per unit time is measured or estimated and compared with a third set threshold (i.e., the minimum treatment load for economical system operation). When the production remains below this threshold, starting and running the full second treatment path unit may be uneconomical. Therefore, the system directs the decision to the first treatment path, and makes a judgment only after the sludge volume accumulates to the economical treatment range, thereby optimizing energy consumption and treatment benefits.

[0048] In this application, the second processing path is based on the specific conditions for the thermo-chemical coupling treatment preset by the object. The object may refer to the target requirement or the source of chemical sludge, for example, specific conditions are set based on actual needs or specific conditions are set based on composition.

[0049] It is understandable that the specific conditions have a high degree of freedom when dealing with actual situations. The specific conditions in this application are based on the effect, which is to effectively destroy the stable structure of sludge flocs and organic matter with relatively low energy consumption.

[0050] In one feasible embodiment, when the sludge is decided to enter the second treatment path, the core step of the thermo-chemical coupling decomposition treatment needs to be precisely controlled. The preferred specific conditions are: placing the concentrated sludge under mild heating conditions of 75°C to 85°C, while maintaining the pH value of the system in the range of 10.5 to 11.5 by adding an alkali agent, and continuing the reaction under this environment for 1 to 2 hours.

[0051] The effect achieved under these specific conditions is that, with relatively low energy consumption, the combined conditions can effectively disrupt the stable structure of sludge flocs and organic matter, and realize the full conversion (liquefaction) of organic matter from the solid phase to the liquid phase, laying the foundation for obtaining high-concentration carbon-rich supernatant in the future.

[0052] In this application, to improve the flexibility of carbon source utilization, a carbon source storage step is set after the second processing path is executed.

[0053] For example, after obtaining carbon-rich supernatant by executing the second processing path, a carbon source storage step is also included: storing at least a portion of the carbon-rich supernatant in a preset container; and reusing the stored carbon-rich supernatant when a carbon source is subsequently determined to be needed based on decision-making conditions.

[0054] Specifically, considering the potential mismatch between the continuity of sludge treatment and the intermittent nature of biochemical demands, some or all of the carbon-rich supernatant produced can be temporarily stored in a pre-designated container (such as a storage tank). This is equivalent to establishing a "carbon source resource pool." When the subsequent system determines the need for carbon sources based on real-time monitoring, it can extract and reuse carbon sources from this "carbon source resource pool." This decouples carbon source production and consumption in time, greatly enhancing the stability and buffering capacity of the system operation.

[0055] Please see Figure 3 The decision-making criteria of this application are composed of multiple judgment conditions. Therefore, the logic for making a preferred selection is as follows: The second treatment path is selected only when the chemical sludge simultaneously meets the conditions for resource utilization potential and the system's carbon source requirements. If the chemical sludge does not meet any of the following conditions: resource potential, carbon source requirements, or sludge production volume, then the first treatment path shall be selected.

[0056] Specifically, the system will only initiate the second path of resource utilization if a batch of sludge simultaneously meets two positive conditions: "the organic matter content characterization value is not lower than the first threshold" (meaning it has resource value) and "the system water quality parameters indicate that a carbon source is needed" (meaning it has reuse requirements).

[0057] Conversely, if the sludge does not meet any of the following conditions: resource potential (high inorganic content), carbon source requirement (currently no carbon source needed), or sludge production quantity (too little quantity is uneconomical), the system will decide to adopt the first path based on economic or necessity considerations.

[0058] Through this "AND" logic, a rigorous logical model is constructed to enable intelligent decision-making for path selection in this application.

[0059] In this application, to achieve efficient and accurate decision-making and execution, the entire judgment and control process is preferably automated. For example, the steps of selecting a treatment path and guiding the sludge to the corresponding treatment path based on the judgment result are executed through automatic control logic based on real-time data from online monitoring.

[0060] Specifically, the steps of selecting a path and switching paths based on the decision are accomplished by acquiring real-time data from online monitoring via sensors and by preset automatic control logic in a controller (such as a PLC). This minimizes human intervention, improves response speed and processing consistency, and ensures reliable implementation of the method.

[0061] Based on the method of this application, taking the degreasing wastewater treatment system of a painting plant as an example, the specific implementation of this application is described.

[0062] Compared with conventional treatment, the original treatment process was as follows: after the degreasing wastewater was pretreated by coagulation and sedimentation, all the chemical sludge produced was dewatered by a plate and frame filter press and then transported off-site. At the same time, methanol was purchased from outside the anoxic tank every day as a carbon source.

[0063] To implement the technical solution of this application, while retaining the original dewatering equipment (the execution terminal of the first treatment path), a new sludge thickening, cracking, and separation device (the execution line of the second treatment path) is added, and online monitoring instruments and automatic control valves are added at key nodes. All instruments and valves are connected to the central PLC control system.

[0064] Combination Figures 1-3 This embodiment can be executed according to the following sequential steps: Step 1: Sludge Acquisition and Signal Collection.

[0065] The chemical sludge from the pretreatment sedimentation tank is pumped to a homogenizing buffer tank. Here, a sludge concentration meter estimates the VSS / SS ratio (a characterization value for organic matter content) of the sludge in real time, and a flow meter records the sludge production per unit time. Simultaneously, a PLC reads data from an online nitrate nitrogen analyzer in the downstream anoxic tank in real time. In this embodiment, the following thresholds are set: first threshold = 0.5, second threshold = 5 mg / L, and third threshold (minimum economic treatment capacity) = 1 cubic meter / hour.

[0066] Step two, intelligent decision-making.

[0067] The PLC executes a decision logic loop once per minute, which corresponds to the "AND" condition judgment in claim 9: First, assess resource potential: if the current VSS / SS ratio is less than 0.5, proceed directly to the first path and halt subsequent assessments.

[0068] If the VSS / SS ratio is ≥0.5, proceed to the next step of system requirement judgment: if the current nitrate nitrogen concentration in the anoxic pool is <5mg / L, then the first path will be executed (because there is no system requirement at present).

[0069] If both the VSS / SS ratio and nitrate nitrogen concentration are ≥0.5 and ≥5mg / L, then the sludge production is assessed: if the sludge flow rate from the buffer tank is below 1 cubic meter / hour for 1 hour, the first path is still executed (for economic reasons); if the flow rate meets the standard, the second path is ultimately executed.

[0070] Step 3: Path execution and processing.

[0071] The first path involves a PLC-controlled switching valve that directly directs the sludge from the buffer tank to the existing plate and frame filter press for dewatering, with the sludge cake then being transported off-site. This path is simple and quick, addressing situations where the sludge is of poor quality, has no demand, or is produced in small quantities.

[0072] The second process involves a PLC-controlled switching valve directing the sludge to the new treatment line. The sludge first enters a thickener, increasing the solids content to approximately 4%. It then enters a thermo-chemically coupled reactor, where the PLC-controlled heating system maintains the temperature at 80°C, and a dosing pump adds NaOH solution to stabilize the pH at 11.0. The reaction proceeds for 1.5 hours. After the reaction, the mixture is centrifuged for solid-liquid separation.

[0073] Step four: Product disposal and reuse.

[0074] The carbon-rich supernatant (COD concentration approximately 15,000 mg / L) separated by centrifugation is temporarily stored in a carbon source storage tank (corresponding to the storage step in claim 8). The metering pump at the tank outlet is linked to the nitrate nitrogen signal in the anoxic pool to achieve precise dosing.

[0075] The inert residue separated by centrifugation is sent to a plate and frame filter press for dewatering. Due to its high inorganic content and low quantity, the dewatering efficiency is higher, and the final sludge cake is transported out.

[0076] Based on the method of this application, when the sludge has low organic content and the system has no instantaneous carbon source requirement, the first treatment path is executed, saving some of the sludge disposal costs. The carbon-rich supernatant produced after the second treatment path can meet the denitrification requirements of the anoxic tank, reducing the cost of purchasing methanol.

[0077] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0078] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0079] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0080] The foregoing description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of embodiments of this disclosure upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described herein. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

Claims

1. A method for treating chemical sludge from degreasing wastewater, characterized in that, The method includes: Based on at least one preset decision-making condition for the chemical sludge generated from the pretreatment of degreasing wastewater, the treatment path for the current batch of chemical sludge is selected and determined. Based on the result of the selection judgment, the chemical sludge is guided and the corresponding treatment path is executed; The processing path includes at least the following: First treatment path: The chemical sludge is dewatered and then transported off-site for disposal; The second treatment path involves sequentially concentrating the chemical sludge, performing thermo-chemical coupling decomposition treatment, and separating the solid and liquid components to obtain a carbon-rich supernatant and an inert residue. The carbon-rich supernatant is reused as an internal carbon source, and the inert residue is dehydrated and then transported off-site for disposal.

2. The method according to claim 1, characterized in that, The decision-making criteria include an assessment of the potential for sludge resource utilization; The assessment of the sludge resource utilization potential specifically includes: Obtain the characterization value of the organic matter content of the chemical sludge, and compare the characterization value of the organic matter content with a first set threshold. When the organic matter content characterization value is lower than the first set threshold, it is determined that the first processing path is selected.

3. The method according to claim 2, characterized in that, The organic matter content is characterized by the ratio of volatile suspended solids to total suspended solids in the chemical sludge.

4. The method according to claim 1, characterized in that, The decision-making criteria include the assessment of the system's carbon source requirements; The determination of the system's carbon source requirements specifically refers to: Obtain water quality parameters characterizing carbon source requirements in subsequent biochemical treatment units, and compare the water quality parameters with a second set threshold. When the water quality parameters indicate that a carbon source needs to be added, it is determined to be one of the conditions for selecting the second treatment path.

5. The method according to claim 4, characterized in that, The water quality parameter is the nitrate nitrogen concentration in an oxygen-deficient environment; when the nitrate nitrogen concentration is higher than the second set threshold, it is determined that a carbon source needs to be added.

6. The method according to claim 1, characterized in that, The decision-making criteria also include the assessment of the amount of sludge produced. The determination of sludge production volume specifically refers to: The chemical sludge production per unit time is obtained, and the production is compared with a third set threshold. When the output is lower than the third set threshold, it is determined that the first processing path is selected.

7. The method according to claim 1, characterized in that, In the second processing path, the specific conditions for the thermo-chemical coupling cracking process are preset based on the object.

8. The method according to claim 1, characterized in that, After obtaining carbon-rich supernatant by executing the second processing path, the process further includes a carbon source storage step: storing at least a portion of the carbon-rich supernatant in a preset container; When a carbon source is subsequently determined to be needed based on the aforementioned decision-making conditions, the stored carbon-rich supernatant will be reused.

9. The method according to any one of claims 1, 2, 4 or 6, characterized in that, The logic for the selection judgment is as follows: The second treatment path is selected only when the chemical sludge simultaneously meets the resource potential condition and the system carbon source requirement condition; If the chemical sludge does not meet any of the following conditions: resource potential, system carbon source requirements, or sludge production volume, then the first treatment path shall be selected.

10. The method according to claim 1, characterized in that, The steps of making the selection judgment and guiding the sludge to the corresponding treatment path according to the judgment result are executed by automatic control logic based on real-time data from online monitoring.

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