High-water-content liquid hazardous waste resource utilization and collaborative disposal system and method

Abstract

The application discloses a high-water-content liquid hazardous waste resourceization and collaborative treatment system and method, and belongs to the technical field of hazardous waste treatment and environmental protection. The system is composed of five units, i.e. hazardous waste receiving and pretreatment, physical and chemical separation, anti-seepage ecological assimilation plant planting, material collaborative treatment and intelligent closed-loop control. For liquid hazardous waste with a water content of 80% or more, oil, water and mud are separated through pretreatment, demulsification, flocculation, precipitation, precision filtration and oxidation treatment. The qualified water is sent to the planting unit to be assimilated by plants, achieving zero leakage, zero external discharge and no pipe connection. The oil phase, sludge solid and mature plants are incinerated in a kiln, heavy metals are solidified in clinker, and flue gas is discharged in a standard way. The application combines resources and ecological assimilation, reduces the pain point of "water burning in the kiln" from the principle point of view, greatly reduces the heat consumption and cost of current high-water-content hazardous waste direct-injection kiln incineration treatment, improves the clinker production capacity and quality, and forms a full-closed-loop resourceization without pollutant leakage.

Description

Technical Field

[0001] The system and method of this invention relate to the field of environmental protection technology for hazardous waste disposal and resource utilization. They are particularly applicable to the co-processing of liquid hazardous waste with a water content ≥80% selected from the hazardous waste list, including but not limited to HW08 waste mineral oil, HW09 oil / water and emulsions, and HW12 dye and coating waste in cement kilns / incinerators. The cement kiln / incinerator mentioned in this invention refers to thermal roasting or incineration equipment including new dry-process rotary kilns for cement clinker, dedicated hazardous waste incinerators, and solid waste co-processing furnaces. Background Technology

[0002] Hazardous waste refers to waste listed in the "National Hazardous Waste List" that possesses hazardous characteristics such as toxicity, corrosivity, and flammability, and is likely to cause harm to the environment and human health. Liquid hazardous waste is a common form of this waste. The high-water-content liquid hazardous waste described in this invention specifically refers to liquid hazardous waste with a water content ≥80% selected from the hazardous waste list, including but not limited to HW08 waste mineral oil, HW09 oil / water and emulsions, and HW12 dye and coating waste. In 2024, the annual disposal volume of these three types of hazardous waste reached 5.9 million to 7.7 million tons. Currently, the industry mostly uses the traditional disposal method of directly injecting liquid hazardous waste into high-temperature kilns for incineration, which has the following inherent defects:

[0003] 1. High moisture content and extremely low calorific value require a large amount of auxiliary fuel to evaporate the moisture, resulting in high energy consumption and costs for treatment;

[0004] 2. When moisture enters the kiln, it vaporizes rapidly, causing significant fluctuations in kiln temperature and internal pressure. This severely impacts kiln conditions, accelerates equipment wear, and reduces clinker production and product quality stability.

[0005] 3. The large-scale combustion of auxiliary fuels has led to a surge in carbon emissions, which does not meet the national "dual carbon" target requirements;

[0006] 4. In order to reduce costs, some enterprises illegally discharge or over-discharge wastewater after physical-chemical separation, which can easily cause soil pollution and impact urban sewage pipe networks, posing serious environmental risks.

[0007] 5. Existing technical solutions only employ physical-chemical separation, ecological disposal, or co-incineration in isolation, without forming a complete technical closed loop or systematic collaborative design. Summary of the Invention

[0008] Technical problems to be solved

[0009] This method alleviates the common pain point of high energy consumption in the hazardous waste disposal industry, which is caused by the direct entry of high-moisture liquid hazardous waste into cement kilns and hazardous waste incinerators, resulting in "boiling water in the kiln". It significantly reduces disposal energy consumption, carbon emissions, and stabilizes kiln conditions.

[0010] To avoid treating high-water-content liquid hazardous waste with only primary treatment, membrane treatment and COD deep treatment are used in synergy to ensure that the separated water meets the standards for use in plant cultivation and disposal, forming a closed-loop disposal of materials and energy in a tiered manner.

[0011] This addresses the problems of existing technologies, such as poor versatility, difficulty in large-scale application, inability to stably dispose of and temporarily store separated water during the non-growing season, and the risk of system overload or illegal sewage discharge in winter. Technical solution

[0012] To achieve the above technical objectives, this invention provides a collaborative disposal system for high-water-content liquid hazardous waste, comprising five core modules: a hazardous waste receiving and pretreatment unit, a physicochemical separation unit, a seepage-proof ecological disposal plant planting unit, a material collaborative disposal unit, and an intelligent closed-loop control unit for full-process control.

[0013] (1) Hazardous waste receiving and pretreatment unit

[0014] The unit includes a receiving pretreatment device, a pH adjustment system, an online pH monitoring instrument, and an interface for external connection to staggered peak storage and control of waste generation.

[0015] Receiving pretreatment unit: Equipped with a mechanical screen to remove large particulate impurities (particle size ≥ 1mm) from hazardous waste, ensuring that subsequent transfer pumps and valves are not subjected to wear.

[0016] pH adjustment system: Based on feedback from online instruments, acid / alkali reagents are automatically added to adjust the pH of hazardous waste to 6.5-8.5 to make it suitable for subsequent separation processes.

[0017] Storage and control interface: It connects to the storage and distribution systems of various external waste-generating enterprises, and can dynamically adjust and limit the hazardous waste feed flow of the current treatment plant during the non-growth season.

[0018] (2) Physical-chemical separation unit

[0019] The unit includes a demulsification device, a flocculation reaction device, a sedimentation device, a precision filtration device (containing membrane treatment and COD deep treatment devices) connected in sequence, as well as a supporting reagent dosing and auxiliary maintenance system.

[0020] Demulsifier: Used to break down the emulsion structure in hazardous waste, enabling preliminary separation of the oil and water phases. The demulsifier is selected from at least one of surfactant-based demulsifiers and polymeric compound demulsifiers.

[0021] Flocculation reaction device: Adding a composite flocculant causes suspended impurities and tiny oil droplets to coagulate into flocs, while simultaneously adsorbing heavy metal ions. The composite flocculant is a mixture of inorganic polymeric flocculants and organic polymeric flocculants.

[0022] Sedimentation device: used for gravity separation, so that the oil phase floats to the top, the flocs sink to the bottom, and the aqueous phase is in the middle layer.

[0023] Precision filtration device: The membrane treatment device adopts a dual-membrane combination process of ultrafiltration (UF) + nanofiltration (NF). The ultrafiltration membrane has a filtration accuracy of 0.01-0.1μm; the nanofiltration membrane has a molecular weight cutoff of 100-1000Da. The concentrate outlet of the membrane treatment device is connected to the front end of the demulsifier through a return pipeline. High-salt heavy metal components and organic impurities in the concentrate return flow are adsorbed, captured, and precipitated by the composite flocculant in the flocculation reaction device, and finally completely discharged from the aqueous phase circulation system with the sludge solids at the bottom of the sedimentation device. The COD deep treatment device adopts an advanced oxidation process, selected from one or a combination of ozone oxidation, Fenton oxidation, photocatalytic oxidation, persulfate oxidation, and electrochemical oxidation. Engineers skilled in the art can dynamically adjust the oxidation ratio while meeting the effluent indicators.

[0024] (3) Seepage-proof ecological waste disposal plant planting unit

[0025] This unit includes a seepage-proof planting carrier, a seepage monitoring layer, an aeration pipe network, online monitoring instruments, a movable and retractable rainproof shed, a seepage-proof diversion ditch, an intelligent irrigation system, and a qualified water temporary storage and regulating tank.

[0026] The seepage-proof planting carrier adopts a double-layer seepage-proof structure, with a 2-100cm monitoring gap reserved between the seepage-proof layers to prevent the leakage of qualified water and soil pollution.

[0027] The leakage monitoring layer is located between the two layers of seepage prevention carrier and contains leakage sensors, with one sensor placed every 5-10m.

[0028] The aeration network is evenly laid at the bottom of the planting carrier and connected to the aeration fan, using an intermittent aeration mode.

[0029] The online monitoring instruments cover water quality monitoring, water level monitoring, soil monitoring and meteorological monitoring, and realize synchronous data transmission.

[0030] Portable and retractable rain shelter: Closes to block excessive rainwater in rainy weather, and closes to keep warm in winter (maintaining a temperature above 5℃).

[0031] (4) Material co-processing unit

[0032] This unit includes an oil phase storage tank, a sludge solids storage bin, a plant crushing / drying / granulation system, a cement kiln / incinerator feeding device, a flue gas purification system, and a biochar / activated carbon preparation system.

[0033] The plant crushing / drying / granulation system crushes mature plants to a particle size ≤10mm, dries them to a moisture content ≤20%, and then granulates them.

[0034] The feeding device adopts a quantitative conveying structure to transport the oil phase, sludge solids and plant fuel particles to the kiln for co-combustion according to the process ratio.

[0035] (5) Intelligent closed-loop control unit

[0036] This unit includes a PLC control cabinet, a data acquisition system, a remote monitoring platform, and an anomaly alarm system, enabling automatic recording, storage (for ≥1 year), and fault alarms of all process parameters.

[0037] Core Methods and Steps

[0038] A method for the collaborative disposal of high-moisture-content liquid hazardous waste, characterized by the following steps:

[0039] S1. Hazardous waste receiving and pretreatment: High-moisture hazardous waste is transported to the hazardous waste receiving and pretreatment device of the physicochemical separation unit via a transfer pump. Large particulate impurities (particle size ≥1mm) in the hazardous waste are removed by a screen. Acid / alkali reagents are added through a pH adjustment system to adjust the pH of the hazardous waste to 6.5-8.5, laying the foundation for subsequent physicochemical separation and deep treatment processes.

[0040] S2. Deep Physicochemical Separation: The pretreated hazardous waste is sequentially transported to a demulsifier, a flocculation reactor, a sedimentation unit, and a precision filtration unit (membrane treatment unit, COD deep treatment unit) to complete the deep separation of oil, water, and sludge solids, ensuring that the separated water meets the standards for plant cultivation. Specific steps are as follows:

[0041] S21. Demulsification: Add conditioning demulsifier, control the stirring speed to 100-200 r / min, and stir for 10-30 min;

[0042] S22. Flocculation: Add composite flocculant, stir quickly and then switch to slow stirring to form dense flocs and simultaneously precipitate and encapsulate the concentrated pollutants in the return water;

[0043] S23. Sedimentation: Gravity sedimentation for 60-120 min, oil phase is collected by top overflow, and bottom sludge is discharged from the bottom;

[0044] S24. Filtration and Deep Purification: After precision filtration, a dual-membrane combined treatment and advanced oxidation process are introduced to finally produce separated water that meets the standards (COD≤100mg / L, ammonia nitrogen≤15mg / L, total heavy metals≤1mg / L, pH=6.5-8.5). The membrane concentrate is returned to the front-end demulsification and conditioning section for circulation, while heavy metals and excess salts are captured by the composite flocculant in the flocculation reaction device and discharged from the system with the sludge.

[0045] S25. Standard Water Temporary Storage and Adjustment Tank: The standard separated water produced by the physicochemical separation unit is discharged into the temporary storage and adjustment tank to provide separated water according to the needs of plant planting in S3, and the water quality is monitored at the same time.

[0046] S3. Ecological Disposal of Standardized Water: Standardized separated water is delivered to the seepage-proof ecological disposal plant planting unit through an intelligent irrigation system for irrigating plants. During the planting process, water quality, water level, soil, and meteorological parameters are monitored in real time by online monitoring instruments to ensure stable water quality. If water quality abnormalities occur, the water is promptly returned to the physicochemical separation unit for reprocessing. Intermittent aeration is carried out through an aeration network to enhance plant root activity. A movable and retractable rainproof canopy is used to adjust the planting environment (rain protection in rainy days and heat preservation in winter) to ensure normal plant growth. The separated water is completely absorbed by the powerful absorption of plant roots, achieving zero leakage and zero discharge, and does not enter the urban sewage network, reducing the load and fluctuation impact on the network. The seepage-proof ecological disposal plant planting unit is connected to a standardized water temporary storage and regulation tank for water volume stabilization and temporary storage during the non-growing season or continuous rainy days, ensuring stable operation of the entire system without being connected to the mains.

[0047] S4. Co-processing of Residual Materials: The oil phase and sludge solids produced by the physicochemical separation unit, as well as the mature plants produced by the seepage-proof ecological disposal plant planting unit, are transported to a cement kiln or incinerator for co-incineration. Specific steps are as follows:

[0048] S41. The oil phase is stored in an oil phase storage tank, and the sludge solids are stored in a sludge solids storage silo. Mature plants are crushed, dried (drying temperature is 80-150℃), and pelletized to produce biomass fuel pellets (particle size is 5-10mm, moisture content ≤20%).

[0049] S42. The oil phase, sludge solids, and biomass fuel particles are fed into a cement kiln or incinerator in a ratio (oil phase, sludge solids: biomass fuel = 1:2-3:4-5, mass ratio) for co-combustion. The combustion temperature is controlled at 1100-1300℃, and the residence time is ≥2s. During the combustion process, the heavy metals enriched in the sludge solids are stably solidified in the clinker, achieving the harmless treatment of heavy metals. The flue gas generated by combustion is treated by the cement kiln / incinerator system's own desulfurization, denitrification, deacidification, and dust removal flue gas purification system before being discharged in compliance with standards.

[0050] S43. Optionally, mature plants can be used as an alternative to incineration. They can be pyrolyzed (pyrolysis temperature 400-600℃, pyrolysis time 1-2h) to prepare biochar or activated carbon. Biochar / activated carbon can be used for deep purification and adsorption of qualified water in the physicochemical separation unit to further improve water quality, or for air purification in the hazardous waste disposal process. When the biochar / activated carbon is deactivated, it is transported to a cement kiln or incinerator for incineration to release heat and complete the harmless disposal at the same time, ensuring that there is no hazardous waste pollution of soil and atmosphere throughout the process.

[0051] S5. Intelligent Closed-Loop Control: Through the PLC control cabinet of the intelligent control unit, data acquisition system, and remote monitoring platform, the entire process of S1-S4 is automatically controlled. Real-time collection and storage of operating data (process parameters, monitoring indicators, etc.) is performed (storage time ≥ 1 year). When abnormal situations such as leakage, water quality exceeding standards, kiln condition fluctuations, or equipment failure occur, the abnormal alarm system will issue an alarm signal in a timely manner, and the staff will handle the situation promptly. This forms a closed-loop process of "high water content hazardous waste → physicochemical separation → ecological disposal of qualified water by plants → co-incineration of remaining materials", ensuring stable system operation and continuous compliance of separated water.

[0052] Beneficial effects

[0053] This invention adopts an innovative approach of "separation first, then deep purification, reuse, and finally incineration." It pre-removes over 80% of the water from high-moisture hazardous waste, sending only the oil phase, sludge solids, and mature plants into the kiln for incineration. This fundamentally improves upon the current industry pain point of "boiling water in the kiln," reducing heat consumption for hazardous waste disposal by 70%-80%, achieving a carbon emission reduction rate of ≥60%, and lowering the cost per ton of hazardous waste disposal by 40%-50%. Simultaneously, it avoids the impact of moisture on kiln conditions, reducing production line downtime and improving disposal stability and economic efficiency. The planted vegetation absorbs CO2 and heavy metals and releases oxygen during its growth, achieving ecological absorption and carbon sequestration synergy, further reducing carbon emissions and aligning with the national "dual carbon" target requirements, thus contributing to environmental protection. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 The overall process flow diagram of the system and method of the present invention is shown below.

[0056] Figure 2 This is a cross-sectional view of the seepage-proof ecological waste-absorbing plant planting unit structure in the system of this invention.

[0057] Figure 3 This is a top view of the seepage-proof ecological waste-absorbing plant planting unit structure in the system of the present invention.

[0058] In the diagram: S1 – Hazardous waste receiving and pretreatment unit; S11 – filtration device; S12 – pH adjustment device; S2 – physicochemical separation unit; S21 – demulsification device; S22 – flocculation reaction device; S23 – sedimentation device; S24 – filtration and deep purification device (including membrane treatment and COD deep treatment device); S25 – qualified water temporary storage and equalization tank; S3 – ecological disposal plant planting unit; S4 – material co-processing; S41 – oil phase storage tank / sludge solids storage silo / plant granulation device; S42 – device for injecting S41 material into the kiln; S4 3 - Device for making carbon-based materials from biological particles; S5 - Intelligent control unit; 15 - Movable and retractable rainproof canopy; 16 - Intelligent irrigation pipe; 17 - Water quality monitoring sensor; 18 - Impermeable planting carrier; 19 - Bottom aeration pipe network; 20 - Leakage monitoring sensor; 21 - Diversion ditch; 22 - Planted plants; 23 - Soil monitoring sensor; 24 - Planting soil; 25 - Impermeable material; 26 - Gravel layer; 27 - Diversion fluid for accidental leakage from planting carrier; 28 - Support structure; 29 - Bottom impermeable layer; 34 - Isolation fence; 35 - Liquid collection tank. Detailed Implementation

[0059] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention. The described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, those skilled in the art can make other embodiments without creative effort, and all of these fall within the scope of protection of the present invention.

[0060] Example 1: Treatment of HW09 type waste emulsion

[0061] The hazardous waste treated in this embodiment is HW09 type waste emulsion with an initial water content of 92%, an initial COD of 3500 mg / L, an initial ammonia nitrogen of 45 mg / L, and an initial total heavy metals of 3.2 mg / L.

[0062] S1 Pretreatment: Remove large particulate impurities with a particle size ≥1mm in the hazardous waste receiving and pretreatment unit, and adjust the pH to 7.0;

[0063] S2 Physicochemical Separation: The mixture is transferred to the second unit, where 0.3% nonionic demulsifier is added, and the mixture is stirred at 150 rpm for 20 minutes to demulsify. Then, 0.1% composite flocculant (PAC:PAM=8:1) is added, and the mixture is stirred rapidly for 8 minutes followed by slow stirring for 20 minutes to flocculate. Gravity sedimentation is performed for 90 minutes, resulting in oil phase, supernatant, and bottom sludge. The bottom sludge is dewatered to a moisture content of 28% to obtain sludge solids. The supernatant is then precision filtered and sequentially treated with UF (0.05 μm) and NF (500 Da), followed by the addition of 10 mg / L ozone and a 15-minute reaction for advanced COD treatment. The final product is qualified water with COD 85 mg / L, ammonia nitrogen 12 mg / L, total heavy metals 0.8 mg / L, and pH 7.2, meeting the requirements for plant cultivation. The membrane concentrate is returned to the demulsification unit for reprocessing.

[0064] S3 Ecological Absorption: The qualified water is irrigated through an intelligent drip irrigation system for plants (reed in this example). The planting unit uses a double-layer HDPE geomembrane with an 8cm gap. A leakage sensor is placed every 8m. Aeration is carried out intermittently (on for 15 minutes and off for 10 minutes). The rainproof shed is closed on rainy days and kept warm at 8℃ in winter. The qualified water is completely absorbed by the plants with zero leakage and zero discharge.

[0065] S4 co-processing: Oil phase, sludge solids, and mature plant particles are mixed at a mass ratio of 1:2.5:4.5 and fed into a cement kiln for incineration at 1100℃ for 2.5 seconds; heavy metals are solidified in the clinker, and the flue gas is purified and discharged in compliance with standards.

[0066] S5 intelligent control: Automatic adjustment of parameters throughout the entire process, data storage for 1.5 years, and audible and visual alarms plus APP alarms in case of abnormalities.

[0067] Example 2: Treatment of HW08 type high water content waste mineral oil

[0068] The hazardous waste treated in this embodiment is HW08 type high water content waste mineral oil, with an initial water content of 88% and an initial COD of 2800 mg / L.

[0069] S1 pretreatment: Remove large particulate impurities with a particle size ≥1mm and adjust the pH to 7.2;

[0070] S2 physicochemical separation: 0.4% cationic demulsifier was added, and the mixture was stirred at 180 r / min for 25 min to demulsify; 0.12% composite flocculant was added, and the mixture was flocculated and precipitated for 100 min; the supernatant was treated with UF+NF, and then subjected to Fenton oxidation for deep treatment, with Fe2+ 0.2 g / L, H2O2 2 g / L, pH 3.0, and a reaction time of 25 min; the final effluent COD was 92 mg / L, meeting the standard.

[0071] S3 Ecological Disposal: Giant Napier grass is irrigated with water that meets standards. The planting unit uses a reinforced concrete seepage-proof pool with double-layer seepage prevention, intermittent aeration, and a rainproof shed to keep the temperature up to 6℃ in winter.

[0072] S4 co-processing: oil: sludge: plant = 1:2.8:4.2, incinerated at 1200℃, residence time 2.2s;

[0073] S5 Intelligent Control: Closed-loop monitoring throughout the entire process.

[0074] Example 3: Disposal of HW12 type dye and coating waste

[0075] The hazardous waste treated in this embodiment is HW12 type dye and coating waste, with an initial moisture content of 86% and an initial COD of 4200 mg / L.

[0076] S1 pretreatment: Remove large particulate impurities with a particle size ≥1mm and adjust the pH to 6.8;

[0077] S2 physicochemical separation: 0.35% demulsifier was added. After demulsification, flocculation, and sedimentation, the supernatant was treated with UF+NF and then photocatalytic oxidation was used for deep COD treatment. The final effluent COD was 88 mg / L.

[0078] S3 Ecological Disposal: Water meeting standards is used to irrigate reeds. The planting units utilize elevated, corrosion-resistant steel plate structures lined with HDPE geomembrane for double-layer impermeability. Rain shelters are deployed to protect against rainwater.

[0079] S4 co-processing: Mature plants are pyrolyzed at 450℃ for 1.5h to prepare biochar, which is used for subsequent deep purification of wastewater. After deactivation, it is incinerated in a kiln; oil sludge and plants are fed into the kiln at a ratio of 1:2.2:4.8 and incinerated at 1200℃.

[0080] S5 Intelligent Control: Closed-loop monitoring throughout the entire process.

[0081] Comparative Example

[0082] Comparative Example 1: Traditional direct kiln incineration: The HW09 waste emulsion from Example 1 was directly fed into the cement kiln for incineration without any pretreatment. The results showed that the heat consumption was 4.5 times that of the present invention, the carbon emissions were 2.8 times that of the present invention, the kiln temperature fluctuation range reached 150°C, and the clinker production decreased by 5%, posing a serious risk of kiln condition shock.

[0083] Comparative Example 2: Physicochemical separation only without membrane / COD deep treatment: Only demulsification, flocculation and sedimentation were performed, without the use of UF+NF dual membrane and advanced oxidation treatment. The COD of the separated water was 320mg / L, which did not meet the standard and could not be used for plant cultivation. Discharge would cause pipeline network impact and did not form a closed loop.

[0084] Comparative Example 3: Ecological Disposal Only Without Hazardous Waste Treatment: Wastewater is disposed of only through plant cultivation, without supporting hazardous waste separation and co-incineration units. It is unable to treat oil phase and sludge solids, and cannot achieve harmless disposal of hazardous waste, thus lacking industrial application value.

[0085] Comparative Example 4: Separate Unit Use: Using only the physicochemical separation unit, separating water for discharge; using only the planting unit, treating ordinary wastewater; using only the co-incineration unit, treating ordinary solid waste. Results show that: it is impossible to achieve full-process treatment of hazardous waste with high water content, and the heat consumption, carbon emissions, and costs are no different from traditional technologies.

Claims

1. A collaborative treatment system for the resource recovery of high-moisture-content liquid hazardous waste, characterized in that, include: Hazardous waste receiving and pretreatment unit, physicochemical separation unit, seepage-proof ecological disposal plant planting unit, material co-processing unit, and intelligent closed-loop control unit; The hazardous waste receiving and pretreatment unit, the physicochemical separation unit, the seepage-proof ecological disposal plant planting unit, and the material co-processing unit are sequentially and collaboratively connected, and the intelligent closed-loop control unit is signal-connected to each of the above units respectively. The hazardous waste receiving and pretreatment unit is used to receive high-water-content liquid hazardous waste and perform impurity removal, conditioning, and source storage and distribution control. The physicochemical separation unit is used to separate the pretreated hazardous waste into three phases: oil, water, and sludge, producing qualified water, oil phase, and sludge solids. The seepage-proof ecological absorption plant planting unit adopts a seepage-proof structure and combines plants to receive the qualified water and carry out in-situ ecological absorption. The material co-processing unit is used to transport the oil phase, sludge solids and the plant material to the kiln for co-incineration in a set ratio.

2. The high-water-content liquid hazardous waste resource recovery and co-processing system according to claim 1, characterized in that: The hazardous waste receiving and pretreatment unit includes a receiving and pretreatment device, a pH adjustment system, and a waste-generating end staggered and collaborative storage control interface. During the off-season for plant growth or during periods of continuous rain, the intelligent closed-loop control unit limits the current system's receiving flow through the storage control interface, instructing the waste-generating end to perform on-site storage.

3. The high-water-content liquid hazardous waste resource recovery and co-processing system according to claim 1, characterized in that: The physicochemical separation unit includes a demulsifier, a flocculation reaction device, a sedimentation device, and a precision filtration device connected in sequence; the precision filtration device includes a membrane treatment device and a COD deep treatment device. The membrane treatment device adopts a dual membrane combination process of ultrafiltration and nanofiltration, and the concentrate outlet of the membrane treatment device is connected to the feed end of the demulsifier through a reflux pipeline.

4. The high-moisture-content liquid hazardous waste resource recovery and co-processing system according to claim 3, characterized in that: The COD deep treatment device employs at least one or a combination of ozone oxidation device, Fenton oxidation device, photocatalytic oxidation device, persulfate oxidation device, and electrochemical oxidation device.

5. The high-water-content liquid hazardous waste resource recovery and co-processing system according to claim 1, characterized in that: The seepage-proof ecological water absorption plant planting unit includes a double-layer seepage-proof carrier, a leakage monitoring layer, an aeration pipe network, online monitoring instruments, a movable and retractable rainproof shed, a seepage-proof diversion ditch, an intelligent irrigation system, and a qualified water temporary storage and regulation tank; a monitoring gap is reserved between the double-layer seepage-proof carriers, and the leakage monitoring layer contains multiple leakage sensors installed in the monitoring gap.

6. The high-water-content liquid hazardous waste resource recovery and co-processing system according to claim 1, characterized in that: The material co-processing unit includes an oil phase storage tank, a sludge solids storage bin, a plant crushing / drying / granulation system, a quantitative feeding device, a flue gas purification system, and a biochar / activated carbon preparation system.

7. The method for co-processing hazardous waste resource utilization according to any one of claims 1-6, characterized in that, Includes the following steps: S1. High-water-content liquid hazardous waste is screened for impurities in the hazardous waste receiving and pretreatment unit, and the pH is adjusted to a neutral or slightly alkaline range; S2. The pretreated material is transported to the physicochemical separation unit, where it undergoes demulsification conditioning, compound flocculation reaction, gravity sedimentation stratification, precision filtration and deep purification in sequence. Water, oil phase and sludge solids that meet the standards are collected respectively, and the concentrated water generated from the deep purification is returned to the demulsification conditioning section for recycling. S3. The qualified water is sent into the qualified water storage tank and then transported to the seepage-proof ecological absorption plant planting unit through the intelligent irrigation system to irrigate the plants. The plants absorb the water in situ through the absorption and transpiration of the plant roots. S4. The oil phase, sludge solids and mature plants are fed into a kiln for co-incineration via a quantitative feeding device, or the grown plants are first pyrolyzed to prepare carbon-based adsorbent materials for use.

8. The method for co-processing hazardous waste resource utilization according to claim 7, characterized in that: In step S1, the material is purified and the pH value is adjusted. The purification involves removing large particulate impurities, preferably particles with a diameter ≥1mm, and the pH adjustment is preferably 6.5–8.

5. In step S2, the deep purification adopts a combination of ultrafiltration and nanofiltration membrane treatment with advanced oxidation process to ensure that the final produced water meets the following standards: COD ≤100mg / L, ammonia nitrogen ≤15mg / L, and total heavy metals ≤1mg / L.

9. A method for the co-processing of hazardous waste resources according to claim 7, characterized in that: In step S3, a movable rain shelter is used to block rainwater on rainy days and to close and insulate in winter, keeping the ambient temperature of the planting area above 5℃. During the non-growing season of plants or during continuous rainy days, a source-linked control mechanism is activated, limiting the current system's feed flow through the hazardous waste receiving and pretreatment unit, and discharging the qualified water in the system into the qualified water storage tank in batches for micro-rate intermittent irrigation. In step S4, the combustion temperature of the kiln is controlled at 850–1300℃, and the residence time is ≥2s. Optionally, the plants are pyrolyzed at 400–600℃ for 1–2 hours to prepare biochar or activated carbon.

10. The system according to any one of claims 1-6 or the method according to any one of claims 7-9, characterized in that: The high-moisture liquid hazardous waste is selected from liquid hazardous waste with a moisture content ≥80% from the hazardous waste list, including but not limited to HW08 waste mineral oil, HW09 oil / water and emulsion, and HW12 dye and paint waste; the plant is selected from at least one of reed, king grass, windmill grass, canna, giant reed, reed, cattail, and elephant grass.

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