A green construction guiding parking lot construction dust and water resource recycling collaborative method

Abstract

The application discloses a kind of green construction guiding under parking lot construction dust and water resource recycling collaborative method, it is related to environmental engineering field, including the following time sequence steps: S1, setting closed fence in the periphery of parking lot construction area, and the main construction road in field is hardened treatment;Through in the whole process of parking lot construction, multi-source wastewater integrated recovery-multistage sediment water purification-regeneration water storage tank online discrimination-PM 10 Real-time monitoring closed-loop system of linkage spraying realizes the deep cooperation of dust control and water resource utilization;Vehicle washing water, foundation pit dewatering, rainwater and concrete curing backflow water are unified into integrated multi-stage sedimentation tank, and qualified reclaimed water is obtained after solid-liquid separation, and 100% municipal tap water is used for dust suppression and washing, completely solving the resource fragmentation problem of new water consumption and wastewater direct discharge waste in traditional construction.

Description

Technical Field

[0001] This invention relates to environmental engineering technology, specifically to a method for coordinating dust control and water resource recycling during parking lot construction under the guidance of green construction. Background Technology

[0002] Against the backdrop of the current accelerated development of urban infrastructure, the level of green construction of municipal supporting projects such as parking lots has become an important indicator for measuring the sustainable development capacity of cities. Among them, the coordinated management of construction dust control and efficient water resource utilization is not only a core requirement of environmental protection supervision, but also a key link in achieving dual carbon goals. However, the existing parking lot construction technology system has exposed a series of systemic defects when dealing with the complex working conditions of high-density urban areas.

[0003] First, dust control and water resource management have long been operated separately, with traditional practices employing independent measures: dust suppression relies on timed watering or manual spraying, with water sources mostly drawn from municipal tap water; wastewater treatment aims to meet discharge standards, with high-turbidity wastewater such as car wash water and foundation pit drainage being discharged after simple sedimentation and rarely reused. This model of consuming fresh water for dust control and not reusing wastewater not only wastes a large amount of clean water resources but also leads to low dust suppression efficiency or excessive spraying causing muddy sites due to the disconnect between watering frequency and actual dust intensity. Second, there is a lack of dynamic control mechanisms based on real-time environmental data; although existing construction sites occasionally set PM2.5 levels... 10 Monitoring points exist, but the data is only used for post-event recording or alarms for exceeding standards. It cannot be linked with the sprinkler system, and dust suppression operations still rely on experience-based judgment or fixed schedules, making it difficult to intervene accurately at the initial stage of dust pollution. Especially during periods of high disturbance such as earthwork excavation and vehicle entry and exit, short-term high-concentration pollution peaks are easily formed, affecting the air quality of surrounding sensitive areas. Furthermore, the utilization of reclaimed water faces dual bottlenecks in safety and efficiency. Although some projects have attempted to recycle car wash water for dust suppression, there is a lack of online assessment and closed-loop control of reclaimed water quality: untreated reclaimed water may clog sprinkler heads or carry pollutants for secondary diffusion; while over-treatment increases energy consumption. At the same time, multiple sources of wastewater, such as rainwater, foundation pit dewatering, and maintenance return water, are not systematically integrated, resulting in fragmented resource utilization paths and making it difficult to form a stable and reliable reclaimed water source.

[0004] More importantly, the solid waste and water resource cycle has not formed a closed loop. The sludge produced by sedimentation tanks is usually transported and disposed of as construction waste, which increases transportation costs and carbon emissions and misses the opportunity for on-site resource utilization. In addition, the final greening often relies on fresh water for irrigation, which fails to connect with the reclaimed water stored during the construction period, resulting in a resource gap of water saving at the front end and water consumption at the end end.

[0005] To address these issues, the applicant proposes a collaborative method for coordinating dust control and water resource recycling during parking lot construction under a green construction approach. Summary of the Invention

[0006] The purpose of this invention is to provide a collaborative method for dust control and water resource recycling in parking lot construction under the guidance of green construction, in order to solve the problem that in the traditional parking lot construction of the prior art, dust control and water resource management are carried out separately: dust suppression relies on municipal fresh water, wastewater is mostly directly discharged and rarely reused; there is a lack of real-time linkage and control, the quality of reclaimed water is uncontrollable, multiple sources of wastewater are not integrated, sludge is transported and disposed of externally, and fresh water is still used for greening, making it difficult to achieve green collaboration throughout the entire process.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for coordinating dust control and water resource recycling during parking lot construction under green construction guidance, comprising the following sequential steps:

[0008] S1. Set up closed fences around the construction area of ​​the parking lot, harden the main construction roads inside the site, and set up automatic vehicle washing platforms and supporting multi-stage sedimentation tank systems at the entrances and exits.

[0009] S2. Collect various types of wastewater generated during construction, including vehicle washing water, foundation pit dewatering, rainwater and concrete curing return water, and feed them into the multi-stage sedimentation tank system for solid-liquid separation and water purification to obtain reclaimed water and store it in the reclaimed water storage tank.

[0010] S3. Install dust monitoring devices at the construction site to obtain PM2.5 data in real time. 10 Concentration data, and dynamically initiate dust suppression operations based on monitoring results;

[0011] S4, when PM 10 When the concentration exceeds the preset threshold, the reclaimed water in the reclaimed water storage tank is automatically used to spray dust on exposed soil, excavation face and transportation road through fog cannon or spray pipe network.

[0012] S5. Simultaneously implement temporary covering or fast-growing grass seed spraying in areas where earthwork has been completed, and prioritize the use of reclaimed water for greening irrigation.

[0013] S6. In the final stage of the project, all remaining reclaimed water will be used for the final greening irrigation of the site, and the sludge in the sedimentation tank will be dewatered and used for backfilling or greening cover.

[0014] Furthermore, in S1, the automatic vehicle washing platform is integrated with the multi-stage sedimentation tank system, including a primary grit chamber, a secondary flocculation sedimentation tank, and a tertiary clear water tank. The primary grit chamber is equipped with a sludge discharge valve at the bottom, and polyaluminum chloride (PAC) is added to the secondary sedimentation tank as a flocculant at a dosage of 10–30 mg / L.

[0015] Furthermore, in S2, the dewatering from the foundation pit is collected through a sump well and then piped into a multi-stage sedimentation tank system; the rainwater is collected through the site drainage ditch into a rainwater storage tank, and after preliminary filtration, it enters the multi-stage sedimentation tank system; the concrete curing adopts a water-retaining covering combined with drip irrigation, and the return water is recycled to the sedimentation system through a diversion channel.

[0016] Furthermore, in step S3, the dust monitoring device is a wireless PM2.5 system. 10 Sensor nodes are deployed at the edge of the foundation pit, the earthwork stockpile, and 1.5 to 2.0 meters above the main transportation road. The sampling frequency is once every 5 minutes, and the data is uploaded to the green construction management platform in real time.

[0017] Furthermore, in S4, the preset threshold is PM. 10 Concentration 80 μg / m 3 When the concentration reaches 80–150 μg / m³ 3 When the concentration is >150 μg / m³, activate the local mist cannon spraying; when the concentration is >150 μg / m³, activate the local mist cannon spraying. 3 Simultaneously activate the entire area sprinkler network, with a spraying intensity of 0.5–1.0 L / m. 2 ·min, continuing until PM 10 Concentration dropped back to 60 μg / m 3 the following.

[0018] Furthermore, in step S5, the temporary covering uses biodegradable dustproof netting or gravel covering, with a coverage rate of ≥95%; the fast-growing grass seed is a mixture of tall fescue and ryegrass seeds, with a sowing rate of 25–30 g / m². 2 After hydroseeding, use recycled water for drip irrigation once a day, with each irrigation amount being 3-5 mm.

[0019] Furthermore, the reclaimed water storage tank is equipped with a level sensor and an online water quality monitoring instrument. When the turbidity is ≤30 NTU and the pH is 6.5 to 8.5, it is determined to be qualified reclaimed water, which can be used for dust suppression and greening. If the water quality does not meet the standards, it will be automatically returned to the secondary sedimentation tank for further treatment.

[0020] Furthermore, in step S6, the sludge from the sedimentation tank is dewatered by a plate and frame filter press to a moisture content of ≤60%, and the resulting mud cake is used for backfilling low-lying areas within the site or as a greening planting soil admixture, with an admixture ratio not exceeding 30%.

[0021] Furthermore, the green construction management platform integrates dust monitoring, reclaimed water storage, sprinkler equipment status, and weather forecast data; when the probability of rainfall in the next 24 hours is greater than 60%, the frequency of road dust suppression is increased in advance; when the temperature is greater than 35℃, the amount of drip irrigation for greening is automatically increased.

[0022] Furthermore, the water used for dust suppression spraying and vehicle washing is all reclaimed water obtained after treatment by the multi-stage sedimentation tank system.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This invention integrates multi-source wastewater recycling, multi-stage sedimentation water purification, reclaimed water storage tank online identification, and PM2.5 treatment throughout the entire parking lot construction process. 10 The closed-loop system of real-time monitoring and coordinated spraying achieves deep synergy between dust control and water resource utilization. Vehicle washing water, pit dewatering, rainwater, and concrete curing return water are uniformly collected into an integrated multi-stage sedimentation tank. After solid-liquid separation, qualified reclaimed water with turbidity ≤30 NTU and pH 6.5–8.5 is obtained, which 100% replaces municipal tap water for dust suppression and washing. This completely solves the resource fragmentation problem of consuming fresh water for dust control and direct discharge of wastewater in traditional construction, and improves water resource recycling efficiency and construction sustainability.

[0025] This invention is based on wireless PM 10 The intelligent linkage between sensor networks and green construction management platforms establishes a tiered response mechanism: when PM... 10 Concentration > 80 μg / m 3 Activate local fog cannons when the concentration is >150 μg / m 3 Simultaneously activating the full-area sprinkler system and dynamically scheduling operations based on meteorological forecast data (such as increasing dust suppression frequency before rainfall and increasing drip irrigation during high temperatures), shifts dust suppression operations from experience-based timing to precise, on-demand intervention. This mechanism not only effectively suppresses short-term pollution peaks under high-disturbance conditions such as earthwork excavation and vehicle transportation, but also avoids PM2.5 concentration spikes. 10 In addition to preventing excessive watering and muddy conditions, targeted spraying and intensity control are used to prevent over-watering, thus balancing environmental efficiency and on-site operational safety.

[0026] This invention further streamlines the water-sludge-green resource cycle: after the sludge from the sedimentation tank is dewatered to a moisture content of ≤60% by plate and frame filter press, it is used on-site for backfilling in low-lying areas or as a soil mix for greening planting. At the same time, during the final stage of the project, all remaining reclaimed water is used for final greening irrigation, and during the middle of construction, priority is given to supporting the spraying and drip irrigation of fast-growing grass seeds, achieving zero water waste management throughout the entire cycle from front-end water conservation to end-end water exhaustion. This closed-loop model not only reduces the transportation of construction waste and carbon emissions, but also improves the survival rate of vegetation and the speed of ecological restoration, providing a replicable zero-waste construction site + ecological delivery technology paradigm for urban infrastructure projects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 This is a schematic diagram of the overall process structure provided for an embodiment of the present invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] As attached Figure 1 As shown:

[0031] Example 1:

[0032] This invention provides a method for the coordinated management of construction dust and water resource recycling in parking lots under the guidance of green construction, comprising:

[0033] S1. Set up a 2.5m high prefabricated fence around the construction area of ​​the parking lot, and harden the main construction roads in the site with C20 concrete (15cm thick). At the same time, set up an automatic vehicle washing platform and a supporting multi-stage sedimentation tank system at the main entrance and exit.

[0034] Specifically, the automatic vehicle washing platform and multi-stage sedimentation tank system are integrated into a single design, including a volume of 8m³. 3 The primary sedimentation tank (equipped with a DN100 sludge discharge valve at the bottom), 12m 3 The secondary flocculation sedimentation tank (with polyaluminum chloride PAC added at a dosage of 20 mg / L) and a 10m 3 The three-stage clear water pool;

[0035] The enclosure blocks external views and wind disturbances, and the hardened roads reduce dust carried by vehicle wheels; the integrated washing-sedimentation system enables immediate washing and sedimentation, preventing wastewater overflow.

[0036] Results: Vehicle cleanliness rate upon exiting the vehicle is ≥98%, dust load on surrounding roads is reduced by 70%, and dust is eliminated during transportation.

[0037] S2. Collect all types of wastewater generated during construction, including vehicle washing water, foundation pit dewatering, rainwater, and concrete curing return water, and channel them into the multi-stage sedimentation tank system for solid-liquid separation and water purification to obtain reclaimed water, which is then stored in a 30m³ tank. 3 In the reclaimed water storage tank;

[0038] Specifically, dewatering from the foundation pit is collected through a sump and piped via a Φ150mm HDPE pipe into the sedimentation system; rainwater is collected in the site drainage ditch and drained to a depth of 5m. ³ The rainwater storage tank filters the water through a screen (5mm aperture) before it enters the sedimentation system; the concrete curing process uses plastic film covering and drip irrigation to retain water, and the returned water is recycled through a U-shaped diversion channel; multiple wastewater sources are treated in a unified manner to avoid resource fragmentation; PAC flocculation promotes colloidal destabilization, and three-stage sedimentation achieves gradient purification;

[0039] Results: Average daily water recovery volume: 45m³ 3 The turbidity of the reclaimed water decreased from an initial 120 NTU to 25 NTU, and the pH stabilized at 7.2.

[0040] S3. Install dust monitoring devices at the construction site to obtain PM2.5 data in real time. 10 Concentration data, and dynamically initiate dust suppression operations based on monitoring results;

[0041] Specifically, six wireless PMs were deployed. 10 The sensor nodes (model: TSIDustTrakDRX8534) are located at the edge of the foundation pit, the earthwork stockpile, and 1.8m above the two main roads. The sampling frequency is once every 5 minutes, and the data is uploaded to the green construction management platform in real time via a 4G module.

[0042] High-frequency monitoring captures instantaneous changes in dust, providing a data foundation for precise intervention;

[0043] Effect: PM 10 Data latency is less than 10 seconds, which is 20 times faster than traditional manual inspection.

[0044] S4, when PM 10 When the concentration exceeds the preset threshold, the reclaimed water in the reclaimed water storage tank is automatically used to spray dust on exposed soil, excavation face and transportation road through fog cannon or spray pipe network.

[0045] Specifically, the preset threshold is 80 μg / m 3 When the concentration reaches 80–150 μg / m³ 3 When the concentration is >150μg / m², activate two 30kW fog cannons to spray the affected area. 3 Simultaneously activate the entire buried sprinkler network (sprinkler spacing 4m), with a spraying intensity of 0.8L / m. 2 ·min, continuing until PM 10 Falling back to 60 μg / m 3 the following;

[0046] A graded response is used to match the pollution intensity, avoiding over-spraying; reclaimed water replaces tap water, achieving dust control through waste;

[0047] Effect: PM 10 The peak reduction rate reaches 65%, the water consumption for a single dust suppression is reduced by 40%, and there is no water accumulation on the site.

[0048] S5. Simultaneously implement temporary covering or fast-growing grass seed spraying in areas where earthwork has been completed, and prioritize the use of reclaimed water for greening irrigation.

[0049] Specifically, the exposed area uses 120g / m². 2 Biodegradable dust control netting was used for coverage (98% coverage); in some slow-development areas, a mixture of tall fescue and ryegrass seeds was sprayed (ratio 3:2, seeding rate 28g / m²). 2 After hydroseeding, use recycled water for drip irrigation once a day, with an irrigation amount of 4 mm each time;

[0050] Covering instantly suppresses dust, and grass seeds quickly establish a lawn to achieve ecological soil stabilization; drip irrigation with reclaimed water ensures high germination rate.

[0051] Results: Vegetation coverage reached 60% in 7 days and 90% in 15 days, with soil erosion reduced by 85%.

[0052] S6. In the final stage of the project, all remaining reclaimed water will be used for the final greening irrigation of the site, and the sludge in the sedimentation tank will be dewatered and used for backfilling or greening soil covering.

[0053] Specifically, the sludge from the sedimentation tank is processed by a plate and frame filter press (filtration area 30m²). 2 The mud cake was dehydrated to a moisture content of 58%, forming approximately 2.5 tons of mud cake. This mud cake was used for backfilling low-lying areas within the site (thickness ≤ 30 cm) and as a soil mix for landscaping (mixing ratio 25%). The remaining 12 m³... 3 All reclaimed water is used for tree root establishment and lawn maintenance; sludge is utilized on-site as a resource, and reclaimed water is used without any waste.

[0054] Results: 3.2 tons of construction waste were reduced, carbon emissions were reduced by 1.8 tons of CO2e, and the final greening survival rate was 95%.

[0055] Specifically, the reclaimed water storage tank is equipped with an ultrasonic level gauge and an online water quality meter (turbidity and pH dual parameters). When the turbidity is ≤30 NTU and the pH is 6.5 to 8.5, it is judged as qualified reclaimed water and the reuse valve is automatically opened. If any indicator exceeds the standard, the PLC controls the return pump to send the water back to the secondary sedimentation tank for further treatment.

[0056] Specifically, the green construction management platform integrates dust, water level, equipment status and meteorological API data; when the forecast of rainfall probability in the next 24 hours is >60%, the frequency of road dust suppression is increased by 1 hour in advance (+1 time); when the temperature is >35℃, the amount of drip irrigation for greening is automatically increased to 5mm / time.

[0057] Specifically, throughout the entire construction period, 100% of the water used for dust suppression spraying and vehicle washing came from on-site recycled water, and no waste was used. 3 Municipal tap water.

[0058] From the above, we can see that:

[0059] The integrated flushing-sedimentation system integrates wastewater from multiple sources and achieves efficient purification through PAC flocculation and three-stage sedimentation, laying a water quality foundation for the safe reuse of reclaimed water.

[0060] PM 10 Real-time monitoring and tiered spraying work together break away from the experience-based watering model, enabling dust suppression on demand and saving water and electricity while ensuring air quality.

[0061] Temporary mulching / grass seeding combined with reclaimed water drip irrigation shifts dust suppression from passive control to active ecological restoration;

[0062] Sludge dewatering and reuse + reclaimed water final irrigation opens up a water-sludge dual cycle, completely eliminating resource gaps;

[0063] The online water quality assessment and meteorological pre-scheduling form an intelligent closed loop, enabling the entire system to have self-adaptive and self-optimizing capabilities.

[0064] Example 2:

[0065] An underground parking lot project in a rainy and humid area was used to verify the dust-water resource synergistic control effectiveness of the present invention under conditions of heavy rainfall, high groundwater levels, and high humidity.

[0066] Steps and procedures:

[0067] 1. Site preparation and fencing hardening:

[0068] Project location: A coastal city in South China, with an average annual rainfall of 1800 mm and a groundwater level 0.8 m below the surface;

[0069] Construction area: 18,000 m² 2 The pit is 8.5m deep.

[0070] A 2.2m high galvanized steel plate fence (with overflow prevention base) is set up, and the main road inside the site is hardened with C25 concrete (18cm thick, with a 1.5% cross slope for drainage).

[0071] The entrance and exit are equipped with a dual-lane automatic flushing platform (flushing pressure 0.6MPa, water circulation rate ≥90%), and a matching integrated multi-stage sedimentation tank system (first-stage grit chamber 6m²). 3 10m secondary flocculation tank 3 8m of three-stage clear water tank 3 );

[0072] PAC flocculant was added to the secondary tank at a dosage of 25 mg / L (slightly higher than in Example 1 due to the high turbidity of rainwater).

[0073] Results: The fencing effectively blocked dust from the sea breeze, the paved roads were free of mud, and the vehicle washing compliance rate was 100%.

[0074] 2. Collection of multi-source wastewater and preparation of reclaimed water:

[0075] Dewatering of the foundation pit: 85m³ / day is pumped out through 8 Φ300 sump wells (equipped with automatic start-stop submersible pumps). 3 It is directly connected to the sedimentation system via HDPE pipes;

[0076] Rainwater management: A circular drainage ditch (30×30cm cross-section) + 10m is installed on the site. 3 The rainwater storage tank (with built-in 5mm stainless steel filter) can intercept 72m³ of rainwater from a single rainstorm (50mm / 24h). 3 ;

[0077] Concrete curing: A geotextile covering + drip irrigation tape return system is used, and the return water flows into the sedimentation tank through the diversion channel;

[0078] 40m³ of reclaimed water storage tank 3 Equipped with a level gauge and an online water quality monitoring instrument;

[0079] Results: The average daily recycled water volume during the rainy season reaches 158 m³, the turbidity of the reclaimed water is ≤28 NTU, and the pH is 7.0–7.8, meeting the reuse standards.

[0080] 3. Real-time dust monitoring and dynamic response:

[0081] Deploy 8 wireless PMs 10 Sensor (TSIDustTrakDRX8534), height 1.7m, sampling frequency 5min / time;

[0082] Preset threshold: PM 10 >80μg / m 3 Activate localized fog cannons (3 units, 22kW power); >150μg / m 3 Turn on the full-area sprinkler system (nozzle spacing 3.5m, intensity 0.9L / m). 2 ·min);

[0083] Due to high humidity, the spraying duration is shortened to PM. 10 It dropped back to 65 μg / m 3 Stop immediately to avoid the ground becoming too wet;

[0084] Effect: PM during earthwork excavation period 10 The peak value is 210 μg / m³, which is higher than that of traditional construction. 3 Reduced to 92 μg / m3 There were no complaints from the surrounding residential areas.

[0085] 4. Ecological soil stabilization and reclaimed water greening:

[0086] For the completed backfill area (approximately 6000m²) 2 The mulch was covered with gravel (10–20 mm in diameter, 96% coverage). Due to the low survival rate of grass seeds during the rainy season, hydroseeding was temporarily suspended.

[0087] Biodegradable dust control netting (150g / m²) was laid in the temporary soil stockpile area. 2 );

[0088] Reclaimed water is prioritized for use in fog cannons and road dust suppression, while drip irrigation (3mm / time) is only activated for greening irrigation during consecutive sunny days (≥3 days).

[0089] Effects: 100% coverage of exposed soil, no dust emission, and the gravel layer has both drainage and dust suppression functions.

[0090] 5. Resource closure in the final stage:

[0091] 22m³ of reclaimed water remaining at the end of the project 3 All of it is used for root establishment of trees and irrigation for lawn replanting;

[0092] The sludge from the sedimentation tank was dewatered to a moisture content of 59% using a plate and frame filter press (model XMZG30 / 800-UB), producing 1.8t of sludge cake.

[0093] The mud cakes were used for backfilling the micro-topography within the site (mixing ratio 20%) and were not transported out.

[0094] Results: Zero fresh water consumption throughout the entire construction process, and 100% reduction in construction waste.

[0095] 6. Verification of the intelligent pre-scheduling mechanism:

[0096] The green construction management platform is connected to the local meteorological bureau's API.

[0097] Two hours before the forecast of a 75% probability of rainfall in the next 24 hours, the system automatically adds one dust suppression cycle to the roads (to prevent dust from rising due to pre-rain dryness).

[0098] During periods of high temperature and humidity (36℃ air temperature, 85% humidity), the system did not trigger the high-temperature drip irrigation command to avoid ineffective water loss due to evaporation.

[0099] Results: Resource allocation is precisely matched with climate characteristics, and the utilization rate of reclaimed water is increased by 18%.

[0100] Method validation (rainy and humid conditions):

[0101] Dust control effect: PM2.5 during construction period 10 Daily average concentration 78 μg / m³3 (National standard limit 150 μg / m 3 The number of days exceeding the standard was 0.

[0102] Water resource recycling rate: 100% of total water consumption is recycled water, saving 2150m³ of municipal fresh water. 3 ;

[0103] Sludge resource utilization rate: 100% on-site utilization, reducing carbon emissions by 1.3tCO2e;

[0104] System stability: Despite experiencing three rainstorms (with a maximum daily rainfall of 62mm), the sedimentation system did not overflow, and the quality of the reclaimed water consistently met the standards.

[0105] Economic efficiency: Compared with the traditional tap water sprinkling + sludge transportation mode, the overall cost is reduced by 12.7%.

[0106] Comparative example:

[0107] The traditional parking lot construction method is adopted, in which dust control and water resource management are operated independently:

[0108] Dust suppression is achieved by watering at a fixed schedule (once each in the morning, noon, and evening, for 30 minutes each time), with all water sourced from municipal tap water.

[0109] The vehicle washing platform is equipped with a simple three-stage sedimentation tank (no flocculant is added, only natural sedimentation). The treated wastewater is directly discharged into the municipal pipe network, and no reclaimed water storage tank is set up.

[0110] PM was not installed at the site 10 Monitoring devices are in place, but dust suppression operations still rely on manual inspections and assessments.

[0111] Exposed soil was covered with ordinary fine-mesh netting (coverage rate of approximately 80%), without grass seeding;

[0112] The sludge from the sedimentation tank is regularly removed and transported to a landfill as construction waste.

[0113] Municipal fresh water will be used for the final greening irrigation.

[0114] This plan represents the current practice of most municipal engineering projects, but it does not achieve resource recycling and intelligent regulation.

[0115] Comparative experimental results:

[0116] <![CDATA[Municipal fresh water consumption (m 3 )]]> 0 1920 Reclaimed water reuse rate (%) 100% (dust suppression + washing + greening) 0% <![CDATA[PM 10 Daily average concentration (μg / m³) 3 )]]> 72 138 Number of days exceeding dust standards (60 days during construction period) 0 days 23 days Vehicle cleanliness rate upon exit (%) ≥98% 85% Sludge disposal methods in sedimentation tanks On-site dehydration and reuse (moisture content ≤60%) Offshore landfill (100%) Sludge transport volume (t) 0 3.5 <![CDATA[Carbon emission reduction (tCO2e)]]> 2.1 —(Benchmark) Green survival rate (%) 95% 82% (due to untimely irrigation with new water)

[0117] As shown in the table above, compared with traditional methods, the present invention has the following advantages:

[0118] Zero new water consumption: It completely replaces municipal tap water for dust suppression and flushing, achieving a water saving rate of 100%, thus solving the long-standing problem of water consumption in the dust control industry.

[0119] More precise and efficient dust control: PM 10 The daily average concentration was reduced by 48%, and the number of days exceeding the standard was reduced to zero, effectively avoiding the impact of short-term pollution peaks on surrounding sensitive areas;

[0120] Solid waste resource utilization closed loop: 100% of sludge is utilized on-site, reducing off-site transportation by 3.5 tons, reducing transportation energy consumption and landfill burden, which is in line with the concept of zero-waste construction site;

[0121] Improved ecological benefits: Reclaimed water ensures the continuity of water use for greening, increasing the survival rate by 13 percentage points;

[0122] Lower overall cost: Although the initial investment in intelligent monitoring and sedimentation systems is increased, the total cost is reduced by 4.0% due to savings in water fees, sewage fees, and garbage collection fees.

[0123] As can be seen from the above, this invention constructs a multi-source wastewater integrated recycling—reclaimed water quality online identification—PM system. 10 The integrated system of real-time spraying, on-site sludge resource utilization, and meteorological pre-scheduling not only solves the systemic defects of traditional construction, such as the separation of dust and water resource management, delayed response, and resource gaps, but also achieves the unity of economic efficiency and sustainability while ensuring environmental compliance, providing a replicable and scalable technical paradigm for green construction in high-density urban areas.

[0124] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for synergistically managing construction dust and water resource recycling in parking lots under green construction guidance, characterized in that, Includes the following timing steps: S1. Set up closed fences around the construction area of ​​the parking lot, harden the main construction roads inside the site, and set up automatic vehicle washing platforms and supporting multi-stage sedimentation tank systems at the entrances and exits. S2. Collect various types of wastewater generated during construction, including vehicle washing water, foundation pit dewatering, rainwater and concrete curing return water, and feed them into the multi-stage sedimentation tank system for solid-liquid separation and water purification to obtain reclaimed water and store it in the reclaimed water storage tank. S3. Install dust monitoring devices at the construction site to obtain PM2.5 data in real time. 10 Concentration data, and dynamically initiate dust suppression operations based on monitoring results; S4, when PM 10 When the concentration exceeds the preset threshold, the reclaimed water in the reclaimed water storage tank is automatically used to spray dust on exposed soil, excavation face and transportation road through fog cannon or spray pipe network. S5. Simultaneously implement temporary covering or fast-growing grass seed spraying in areas where earthwork has been completed, and prioritize the use of reclaimed water for greening irrigation. S6. In the final stage of the project, all remaining reclaimed water will be used for the final greening irrigation of the site, and the sludge in the sedimentation tank will be dewatered and used for backfilling or greening cover.

2. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... In S1, the automatic vehicle washing platform is integrated with the multi-stage sedimentation tank system, including a primary grit chamber, a secondary flocculation sedimentation tank, and a tertiary clear water tank. The primary grit chamber is equipped with a sludge discharge valve at the bottom, and polyaluminum chloride (PAC) is added to the secondary sedimentation tank as a flocculant at a dosage of 10–30 mg / L.

3. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... In S2, the dewatering from the foundation pit is collected through a sump and then piped into a multi-stage sedimentation tank system; the rainwater is collected in the site drainage ditch and then enters the rainwater storage tank after preliminary filtration; the concrete curing adopts a water-retaining covering combined with drip irrigation, and the return water is recycled to the sedimentation system through a diversion channel.

4. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... In step S3, the dust monitoring device is a wireless PM2.5 system. 10 Sensor nodes are deployed at the edge of the foundation pit, the earthwork stockpile, and 1.5 to 2.0 meters above the main transportation road. The sampling frequency is once every 5 minutes, and the data is uploaded to the green construction management platform in real time.

5. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... In S4, the preset threshold is PM 10 Concentration 80 μg / m 3 When the concentration reaches 80–150 μg / m³ 3 When the concentration is >150 μg / m³, activate the local mist cannon spraying; when the concentration is >150 μg / m³, activate the local mist cannon spraying. 3 Simultaneously activate the entire area sprinkler network, with a spraying intensity of 0.5–1.0 L / m. 2 ·min, continuing until PM 10 Concentration dropped back to 60 μg / m 3 the following.

6. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... In step S5, the temporary cover uses biodegradable dustproof netting or gravel, with a coverage rate of ≥95%; the fast-growing grass seed is a mixture of tall fescue and ryegrass seeds, with a sowing rate of 25–30 g / m². 2 After hydroseeding, use recycled water for drip irrigation once a day, with each irrigation amount being 3-5 mm.

7. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... The reclaimed water storage tank is equipped with a level sensor and an online water quality monitoring instrument. When the turbidity is ≤30 NTU and the pH is 6.5 to 8.5, it is judged as qualified reclaimed water and can be used for dust suppression and greening. If the water quality does not meet the standards, it will be automatically returned to the secondary sedimentation tank for further treatment.

8. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... In step S6, the sludge from the sedimentation tank is dewatered by a plate and frame filter press to a moisture content of ≤60%, and the resulting mud cake is used for backfilling low-lying areas on site or as a greening planting soil admixture, with an admixture ratio not exceeding 30%.

9. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... The green construction management platform integrates dust monitoring, reclaimed water storage, sprinkler equipment status, and weather forecast data; when the probability of rainfall in the next 24 hours is greater than 60%, the frequency of road dust suppression is increased in advance; when the temperature is greater than 35℃, the amount of drip irrigation for greening is automatically increased.

10. The method for synergistic utilization of construction dust and water resources in parking lots under green construction guidance, as described in claim 1, is characterized in that... The water used for dust suppression spraying and vehicle washing is all recycled water obtained after treatment by the multi-stage sedimentation tank system.

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