Ecological treatment process for photovoltaic foundation construction waste

Abstract

The invention discloses a photovoltaic foundation construction waste ecological treatment process, and relates to the technical field of photovoltaic waste treatment, and the photovoltaic foundation construction waste ecological treatment process comprises the following steps: dividing wastes into four types and carrying out basic detection; each type of waste is subjected to targeted treatment such as dehydration, crushing, tedding or separation; preparing two core materials, namely a curing agent and an ecological restoration agent, from the treated wastes; sequentially laying a stable layer, a transition layer and an ecological layer from bottom to top to form a three-layer treatment body; planting specific plants and implementing system irrigation maintenance to restore ecology; the effect is monitored, and the qualified treatment area is fused with the photovoltaic site landscape. According to the method, various wastes can be converted into a stable ecological base material in situ and site vegetation restoration can be realized through classified pretreatment, specific formula solidification and layered ecological construction processes aiming at the photovoltaic construction wastes.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic waste treatment technology, and in particular relates to an ecological treatment process for photovoltaic foundation construction waste. Background Technology

[0002] During the construction of photovoltaic power plants, the foundation construction phase generates a large amount of complex waste, mainly including drilling mud for pile foundations, concrete residue, excavated soil, and oily pollutants. Currently, the industry's conventional methods for handling such waste are still mainly centralized transportation and landfill or simple stockpiling. This traditional treatment model has problems; it only achieves the physical transfer of waste or occupies space, failing to treat it as a potential resource for effective transformation and utilization, thus cutting off the material circulation path within the construction site. This not only leads to the continuous depletion of land resources and the potential risk of secondary environmental pollution, but also deprives photovoltaic power plants of the opportunity to achieve site ecological restoration and improvement through their own waste during construction, contradicting the environmental protection concept of green energy projects. Therefore, the following solutions are proposed to address the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide an ecological treatment process for photovoltaic foundation construction waste. Through classification and pretreatment of photovoltaic construction waste, solidification with specific formulas, and layered ecological construction process, various types of waste can be transformed into stable ecological substrates in situ and the site vegetation can be restored. This solves the problem in the prior art that waste can only be transported to landfills, cannot be recycled, and is prone to secondary pollution and waste of land resources.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to an ecological treatment process for photovoltaic foundation construction waste, comprising the following steps: Step S1: Classify the waste generated from photovoltaic foundation construction into at least mud waste, concrete and gravel mixture, excavated topsoil, and oily waste; Step S2: Perform targeted pretreatment on each type of waste after sorting. The pretreatment includes dehydrating and solidifying mud waste, crushing and screening concrete and gravel mixture, cleaning and drying excavated surface soil, and separating oil from oily waste. Step S3: Using at least a portion of the pretreated waste as raw materials, prepare a specialized solidification-modifier and microbial-plant synergistic remediation agent; Step S4: Construct a multi-layered structural system at the treatment site, consisting of a stabilizing layer, a transition layer, and an ecological layer from bottom to top; wherein, the stabilizing layer is mainly composed of pretreated mud waste mixed with the solidification-modification agent; the transition layer is mainly composed of pretreated topsoil, fine aggregate, and oily waste solids; and the ecological layer is laid with the microbial-plant synergistic remediation agent; Step S5: Introduce a composite plant community onto the surface of the ecological layer and carry out systematic ecological maintenance until a stable vegetation cover is formed.

[0005] Furthermore, in step S2, the dehydration and solidification treatment of the mud waste includes: adding a dehydrating agent containing modified bentonite, quicklime and aluminum sulfate to the mud, and performing physical drainage and compaction.

[0006] Furthermore, in step S2, the oil separation treatment of oily waste includes: adding a biosurfactant and stirring, followed by settling to remove the upper oil-water mixture.

[0007] Further, in step S3, the raw materials for preparing the curing-modifier include: pretreated concrete fine powder, pozzolanic material, silicate cement, lignosulfonate, ferrous sulfate and short fiber material, and the components are mixed in a predetermined proportion.

[0008] Further, in step S3, the preparation of the microbial-plant synergistic remediation agent includes: mixing pretreated topsoil, humic acid, porous mineral materials, slow-release fertilizer, water-retaining agent, and a composite microbial inoculum containing petroleum hydrocarbon-degrading bacteria, heavy metal-tolerant bacteria, and nitrogen-fixing bacteria in a predetermined ratio. Further, in step S4, the method for constructing the stabilizing layer includes: mixing and stirring the dehydrated mud waste, the solidification-modifier, and the pretreated aggregate in a predetermined ratio, filling the treatment trench, compacting, and curing.

[0009] Further, in step S4, the method of constructing the transition layer includes: mixing the pretreated topsoil, the pretreated fine aggregate, the oily waste solids after oil separation treatment, and a small amount of solidifying-modifying agent in a predetermined ratio, then laying the mixture on the stabilizing layer and compacting it.

[0010] Furthermore, in step S5, the introduced composite plant community includes at least three of the following: deep-rooted plants, shallow-rooted plants, nitrogen-fixing plants, and heavy metal-accumulating plants, and is planted by sowing and / or cutting.

[0011] Furthermore, in step S5, the systematic ecological maintenance includes: implementing regular micro-sprinkler irrigation in the early stage of planting to keep the substrate moist, and supplementing slow-release fertilizer and / or functional microbial agents according to monitoring during plant growth.

[0012] Furthermore, it also includes a step of comprehensively assessing the vegetation growth, soil environmental indicators, and structural stability of the treated area at a predetermined time after the completion of ecological restoration, and integrating the qualified areas with the surrounding photovoltaic fields in terms of landscape.

[0013] The present invention has the following beneficial effects: This invention enables in-situ classification, treatment, and resource utilization of photovoltaic construction waste, transforming waste with different characteristics into ecological restoration substrates. Through layered construction and specific formulations, waste stabilization is achieved while creating conditions for plant growth, promoting ecological restoration of the construction area. The entire process reduces the environmental risks and costs of transporting and disposing of waste off-site, achieving synergy between pollutant control, soil improvement, and vegetation reconstruction, thereby enhancing the overall ecological and environmental benefits of photovoltaic power plants.

[0014] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the process for ecological treatment of photovoltaic foundation construction waste according to the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 As shown, this invention is an ecological treatment process for photovoltaic foundation construction waste, the treatment process including: Step S1: Waste Classification and Characteristic Analysis Step S11: Designate a temporary waste storage area at the photovoltaic construction site and sort the waste according to the following four categories: Category A: Piling drilling mud waste (moisture content 60-80%, pH value 7.5-9.0); Category B: Mixture of concrete residue and crushed stone (uneven particle size, containing cement components); Category C: Topsoil from foundation excavation (containing organic matter, loose structure); Category D: Oily waste generated from cleaning construction machinery (mineral oil content 1-3%) Step S12: Perform rapid testing on each type of waste: Use a moisture meter to measure the moisture content of type A waste; use a pH meter to measure the pH value of each type of waste; perform rapid screening for petroleum hydrocarbons on type D waste.

[0019] Step S2, Pretreatment Process Step S21, Pre-treatment of Class A mud waste: Excavate diversion ditches around the mud waste dumping area and lay an impermeable membrane at the bottom of the ditches; set up a vertical drainage well with a diameter of 30cm in the center of the dumping area, and fill the well with crushed stone with a particle size of 2-4cm; evenly spread a dehydrating agent on the surface of the mud, the composition of which is: modified bentonite (60%), quicklime (30%), and aluminum sulfate (10%), and the spreading amount is 15kg per cubic meter of mud; use tracked machinery to roll back and forth on the surface of the mud 3 times, with an interval of 12 hours between rolls; after draining for 48 hours, the water content of the mud drops to 40-45%, forming a semi-solid paste; Step S22, Pretreatment of Class B concrete residue: Use a jaw crusher to crush concrete blocks to a particle size of less than 5cm; classify them through a double-layer vibrating screen (upper screen with a mesh size of 3cm, lower screen with a mesh size of 0.5cm): particles larger than 3cm are returned to the crusher for further crushing; particles between 0.5-3cm are reserved as aggregate; fine powder smaller than 0.5cm is reserved as filler. Step S23, C-type surface soil pretreatment: Loosen the soil using a rotary tiller to a depth of 30cm; remove stones and plant roots larger than 10cm in diameter; pile the soil into 1.2m high winds and allow it to air dry naturally until the moisture content reaches 18-22%; Step S24, Pretreatment of Class D oily waste: Collect the oily waste into the seepage-proof treatment tank; add biosurfactant (rhamnolipin, concentration 0.5%), the amount added is 0.3% of the weight of the waste; use a mixer to stir at 60 rpm for 30 minutes; after standing and separating for 24 hours, separate the upper oil-water mixture, and the lower solids enter the subsequent treatment.

[0020] Step S3: Preparation of the ecological treatment formula Step S31, Preparation of Curing-Modifier: Weigh the following raw materials by weight percentage: Pretreated Class B fine powder (particle size <0.5cm): 45%; pozzolanic material: 25%; silicate cement: 15%; lignosulfonate: 8%; ferrous sulfate: 5%; polyvinyl alcohol fiber (length 6mm): 2%; The above raw materials were mixed using a twin-shaft mixer for 15 minutes at a speed of 45 rpm to obtain a homogeneous powdered curing modifier.

[0021] Step S32: Preparation of Microbial-Plant Synergistic Repair Agent Step S321, Bacterial Culture Expansion: Take petroleum hydrocarbon degrading bacteria (Pseudomonas aeruginosa NY3), heavy metal tolerant bacteria (Bacillus subtilis ATCC 6051), and nitrogen-fixing bacteria (Azotobacter chroococcum) preserved in the laboratory; inoculate them separately into special culture medium and culture at 30℃ and 150 rpm for 48 hours on a shaker; mix the three bacterial cultures at a volume ratio of 2:1:1, and the total bacterial concentration reaches... .

[0022] Step S322, Preparation of remediation agent: Take 60% of the pretreated Class C soil; add 20% humic acid powder; add 10% vermiculite powder; add 5% slow-release fertilizer (NPK 15-15-15); add 3% water-retaining agent (polyacrylamide); add 2% of the above mixed bacterial solution (by total weight); mix evenly under light-protected conditions, and control the moisture content at 25-30%.

[0023] Step S4: Layered Construction Step S41, Site Preparation: Excavate a treatment trench in the open area between the photovoltaic arrays. The trench dimensions are: 80cm deep, 200cm wide, and the length is determined according to the actual situation. The bottom of the trench is compacted to a compaction degree of ≥90%. A 5cm thick layer of coarse sand is laid at the bottom of the trench as a drainage layer. Step S42, Subbase Construction (Stabilizing Layer): Take 60% of the pretreated Class A mud waste; add 30% of the solidification-modifier; add 10% of the pretreated Class B aggregate (0.5-3cm); mix with a forced mixer for 8 minutes to form a uniform mixture; fill the mixture into the foundation trench with a thickness of 30cm; compact with a plate vibrator at a frequency of 50Hz for 30 seconds per square meter; after smoothing the surface, cover with geotextile and cure for 72 hours. Step S43, Intermediate Layer Construction (Transition Layer): Take 70% of the pretreated Class C soil; add 20% of the pretreated Class B fine powder; add 10% of the pretreated Class D waste solids (treated in step 2.4); add 5% of the solidification-amendment (by total weight); mix evenly using a rotary tiller; lay the mixture on top of the stabilization layer to a thickness of 25cm; compact twice using a light roller at a speed of 2km / h; Step S44, Surface construction (ecological layer): Spread the microbial-plant synergistic remediation agent evenly on the surface of the transition layer to a thickness of 15cm; use a disc rake to loosen the soil in a shallow manner to a depth of 10cm; form a micro-topography with 1-2cm undulations on the surface to increase surface area and ecological diversity.

[0024] Step S5: Ecological Restoration and Maintenance Step S51, Plant Arrangement and Planting: Step S511: Select a suitable combination of restorative plants for the local climate. Deep-rooted plants: Alfalfa (seed rate 20g / m²); Shallow-rooted plants: Ryegrass (seed rate 15g / m²); Nitrogen-fixing plants: White clover (seed rate 10g / m²); Heavy metal accumulating plants: Sedum aizoon (cuttings, plant spacing 20cm). Step S512, Planting: Mix seeds with fine sand in a 1:3 ratio and sow evenly using a manual seeder; for Sedum sarmentosum, use cuttings to insert them to a depth of 8-10cm; after sowing / cutting, lightly cover with soil to a thickness of 0.5-1cm. Step S52, Initial Maintenance: Install a micro-sprinkler irrigation system with a nozzle spacing of 2m; First week after sowing: Sprinkle once a day for 15 minutes each time to keep the surface moist; Second to fourth weeks: Sprinkle once every two days for 20 minutes each time; Monitor plant growth monthly and record indicators such as coverage and plant height. Step S53, Long-term Management: In the third month after planting, apply a special slow-release fertilizer (NPK 10-10-10) at a rate of 50g / m²; collect soil samples every six months to test indicators such as pH value, heavy metal content, and petroleum hydrocarbon residue; adjust maintenance measures based on monitoring results, such as supplementing with specific functional microbial agents or adjusting irrigation plans.

[0025] Step S6: Evaluation of Treatment Results and Site Integration Step S61: Conduct a comprehensive evaluation 12 months after the treatment is completed. Plant community survey: number of species, coverage, biomass; Soil physicochemical indicators: pH value, organic matter content, heavy metal leaching toxicity; Structural stability: Field load test, bearing capacity ≥80kPa; Step S62: After the assessment is passed, the treated area will be integrated with the surrounding photovoltaic field area in terms of landscape: local ornamental shrubs will be planted in the edge area to form a natural transition; ecological signs will be set up to explain the ecological restoration function of the area; Step S63: Establish long-term monitoring points and conduct annual follow-up tests to ensure the sustainability of ecological effects.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An ecological treatment process for photovoltaic foundation construction waste, characterized in that, The method includes the following steps: Step S1: Classify the waste generated from photovoltaic foundation construction into at least mud waste, concrete and gravel mixture, excavated topsoil, and oily waste; Step S2: Perform targeted pretreatment on each type of waste after sorting. The pretreatment includes dehydrating and solidifying mud waste, crushing and screening concrete and gravel mixture, cleaning and drying excavated surface soil, and separating oil from oily waste. Step S3: Using at least a portion of the pretreated waste as raw materials, prepare a specialized solidification-modifier and microbial-plant synergistic remediation agent; Step S4: Construct a multi-layered structural system at the treatment site, consisting of a stabilizing layer, a transition layer, and an ecological layer from bottom to top; wherein, the stabilizing layer is mainly composed of pretreated sludge waste mixed with the solidification-modification agent; the transition layer is mainly composed of pretreated topsoil, fine aggregate, and oily waste solids; and the ecological layer is laid with the microbial-plant synergistic remediation agent; Step S5: Introduce a composite plant community onto the surface of the ecological layer and carry out systematic ecological maintenance until a stable vegetation cover is formed.

2. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S2, the dehydration and solidification treatment of the mud waste includes: adding a dehydrating agent containing modified bentonite, quicklime and aluminum sulfate to the mud, and performing physical drainage and compaction.

3. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S2, the oil separation treatment of oily waste includes: adding a biosurfactant and stirring, followed by settling to remove the upper oil-water mixture.

4. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S3, the raw materials for preparing the curing-modifier include: pretreated concrete fine powder, pozzolanic material, silicate cement, lignosulfonate, ferrous sulfate and short fiber material, and the components are mixed in a predetermined ratio.

5. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S3, the preparation of the microbial-plant synergistic remediation agent includes: mixing pretreated topsoil, humic acid, porous mineral materials, slow-release fertilizer, water-retaining agent, and a composite microbial inoculum containing petroleum hydrocarbon degrading bacteria, heavy metal tolerant bacteria, and nitrogen-fixing bacteria in a predetermined ratio.

6. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S4, the method for constructing the stabilizing layer includes: mixing and stirring the dehydrated mud waste, the solidification-modifier, and the pretreated aggregate in a predetermined ratio, filling the treatment trench, compacting, and curing.

7. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S4, the method for constructing the transition layer includes: mixing pretreated topsoil, pretreated fine aggregate, oily waste solids after oil separation treatment, and a small amount of solidifying-modifying agent in a predetermined ratio, then laying the mixture on the stabilizing layer and compacting it.

8. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S5, the introduced composite plant community includes at least three of the following: deep-rooted plants, shallow-rooted plants, nitrogen-fixing plants, and heavy metal accumulating plants, and is planted by sowing and / or cutting.

9. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, In step S5, the systematic ecological maintenance includes: implementing regular micro-sprinkler irrigation in the early stage of planting to keep the substrate moist, and supplementing slow-release fertilizer and / or functional microbial agents according to monitoring during plant growth.

10. The ecological treatment process for photovoltaic foundation construction waste according to claim 1, characterized in that, It also includes a scheduled time after the completion of ecological restoration to conduct a comprehensive assessment of the vegetation growth, soil environmental indicators and structural stability of the treated area, and to integrate the qualified areas with the surrounding photovoltaic fields in terms of landscape.

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