156 results about "Water salt" patented technology

The invention discloses a saline-alkali soil dynamic precise irrigation method based on a water-salt-carbon flux coupling model, and relates to the technical field of saline-alkali soil improvement and precise irrigation, and the method comprises the following steps: dividing soil into a surface layer, a middle layer and a deep layer, building the coupling model based on a Darcy law, a convection-dispersion equation and a first-order dynamic model, and simulating a water-salt-carbon flux dynamic state; collecting data such as soil water content, conductivity and organic carbon content through a layered sensor network, and inputting the data into the model after cleaning and fusing; the irrigation time, the irrigation amount and the water quality are optimized through a genetic algorithm in combination with the crop growth period requirements; irrigation is executed through an intelligent valve and a variable frequency water pump, and model parameters are adjusted based on real-time monitoring feedback. According to the method, multi-element cooperative regulation and control of saline-alkali soil irrigation are achieved, the soil ecological process can be accurately simulated, the water resource utilization efficiency is improved, the soil environment is improved, and crop yield increase is promoted.

The invention relates to the technical field of data twinning, in particular to a saline-alkali soil water-salt motion simulation method based on big data analysis. The method comprises the following steps: collecting saline-alkali soil multi-source monitoring data; based on the saline-alkali soil multi-source monitoring data, salt soil layer correlation feature analysis and water-salt driving factor coupling feature analysis are carried out, and salt soil layer correlation feature data and water-salt driving factor coupling feature data are obtained; simulation relation model design of saline-alkali soil water-salt movement is carried out through the saline-alkali soil level correlation feature data and the water-salt driving factor coupling feature data, and a saline-alkali soil water-salt movement simulation model is generated; based on the saline-alkali soil water-salt motion simulation model, designing saline-alkali soil farmland irrigation simulation parameters; and carrying out water-salt motion simulation prediction and feedback of the saline-alkali soil farmland irrigation on the saline-alkali soil farmland irrigation simulation parameters. According to the saline-alkali soil water-salt motion simulation analysis method, multi-driving-factor fusion and accurate spatial heterogeneity description are achieved.

The invention discloses a soil water and salt dynamic monitoring and quality evaluation method based on multispectral remote sensing, and relates to the field of geological monitoring, and the method comprises the steps: carrying out the scattering deviation correction and roughness correction of an observation spectrum through a satellite remote sensing image, an unmanned aerial vehicle multispectral image, a ground sample and meteorological driving data; the soil intrinsic reflectivity, the vegetation coverage component and the salt crusting component are obtained; a water-salt inversion model is established by combining thermal infrared and red edge wave band information, and multi-temporal soil volumetric moisture content and surface salinity index are inverted; by introducing meteorological conditions and vegetation dynamic characteristics, a water-salt coupling partial differential equation and a graph space-time constraint model are constructed, and continuous space-time distribution of soil water content and salinity is obtained; extracting salinity, moisture, vegetation response and soil health indexes, establishing a soil quality comprehensive evaluation model, and outputting high-risk plaques and a treatment priority sequence. The method realizes dynamic monitoring and quality grading evaluation of soil water and salt, and is suitable for saline-alkali soil treatment and ecological restoration.

The invention discloses a salinization dynamic monitoring method based on water-salt migration characteristics and a related device, and relates to the technical field of agricultural informationization, the method comprises the following steps: processing microwave remote sensing data into characteristic data, and using a soil salt content inversion model to obtain remote sensing inversion soil salt content, and assimilating microwave remote sensing data by using a water-salt migration model in combination with daily evaporation capacity, soil water content and underground water data to obtain soil salt content changing along with time in a target period. The microwave remote sensing data and the water-salt migration model are combined, the defects of the water-salt migration model in the aspect of soil salinization monitoring can be overcome, the limitation that common optical remote sensing data are greatly restricted by weather factors such as cloud and mist can be overcome, the method can be suitable for soil salinization monitoring in a regional range, and the application prospect is wide. The dynamic change of the salt content of the saline soil can be accurately monitored in a large range for a long time.

The invention provides a rapid evaluation method and system for the soil fertility level, and relates to the technical field of soil fertility detection.The rapid evaluation method comprises the steps that an original absorbance spectral data curve is obtained by scanning a soil sample, the moisture peak absorbance, the actual peak position wavelength and the moisture synthetic frequency characteristic peak width are extracted, and a spectral data basis is provided; a water-salt optical path coupling factor is calculated, water-salt correction operation is carried out in combination with a volume correction coefficient, a virtual dry soil spectrum data curve is obtained, interference of salt on a water optical path is quantified, and a water background and salt masking are eliminated; constructing a characteristic virtual baseline of the organic matter and the total nitrogen, calculating an integral area to obtain characteristic intensity of the organic matter and the total nitrogen, and providing a physical input variable for quantitative inversion; introducing a water-salt optical path coupling factor to invert the organic matter content and the total nitrogen content, and correcting signal depression caused by salt stress; the effective fertility index is calculated and graded by combining the organic matter content and the total nitrogen content of the soil, and the actual fertilizer supply capacity of the soil is comprehensively evaluated.

The invention provides a vacuum concealed pipe circulating water salt elimination system which comprises a plurality of concealed pipes which are respectively connected with a water conveying pipe through a water collecting pipe; the concealed pipe comprises a pipe body, and a plurality of water collecting holes are formed in the pipe body; each water collecting pipe is provided with a vacuum negative-pressure drainage device, the water conveying pipe is connected with a salt washing water treatment device, and the water conveying pipe is provided with a water suction pump; a water outlet pipe is further connected to the salt washing water treatment device, and the water outlet pipe is connected with an irrigation leaching water distribution device used for leaching soil; the front end of the electrodialysis treatment unit is connected with a water storage tank, and the rear end of the electrodialysis treatment unit is connected with a fresh water tank. Water and air in soil are pumped out through air pumping of the vacuum pump, negative pressure is formed, and the water drainage speed in the concealed pipe salt drainage process is increased, so that the single-time salt leaching time is shortened, the salt drainage efficiency is greatly improved, the concealed pipe laying investment cost is reduced, water is saved, and water pollution caused by direct drainage of salt washing water is prevented.

The invention provides a reservoir pressure salinity scheduling method based on a physical information neural network (PINN). The reservoir pressure salinity scheduling method comprises the following steps: Step 1, salinity prediction based on a physical information neural network (PINN) model; the method comprises the following steps: in a PINN model framework, embedding a physical law of salinity conservation into a multi-layer perceptron (MLP) artificial neural network for training so as to carry out salinity prediction; step 2, establishing an estuary water-salt model based on a three-dimensional ocean numerical FVCOM model; step 3, carrying out upstream reservoir salty water pressing and light water supplementing emergency scheduling based on salinity forecast; comprising the following steps: Step3.1, establishing a multi-objective function; and Step3.2, solving a scheduling model. According to the method, the salinity momentum conservation constraint can be considered, the salinity prediction accuracy under the influence of different upstream flows and downstream tidal ranges can be improved, and the emergency scheduling of the reservoir for the salt tide invasion of the estuary drinking water source can be carried out in combination with the scheduling model, so that the water supply safety is ensured.

The invention discloses a method for safely irrigating saline water with different mineralization degrees and reducing salt in a plough layer, and relates to the technical field of agricultural irrigation, and the method is characterized by comprising the following steps: monitoring the mineralization degree of irrigation water and soil moisture and salt dynamic states under various irrigation mode conditions; through a soil column simulation test, a saline water mineralization degree threshold value suitable for irrigation of saline-alkali cultivated lands with different soil properties and salt contents is found; performing a plot test in the field, and establishing an irrigation water-soil water-underground water salt migration model under various irrigation modes; hYDRUS-1D software is adopted for dynamic simulation and prediction of soil hydrothermal salt coupling migration under different saline water irrigation conditions. The method can be suitable for different soil texture types, crop types and underground water conditions, the salt content of the saline-alkali cultivated land can be effectively reduced, on the premise that crop growth is guaranteed, salt water resources are utilized to the maximum extent, irrigation cost is reduced, sustainable utilization of the saline-alkali cultivated land is achieved, and the method has important practical application value.

The invention relates to the technical field of soil drainage and salt improvement, in particular to a coastal saline-alkali soil drainage and salt improvement intelligent regulation and control method and system based on artificial intelligence, and the method specifically comprises the following steps: dividing treatment units, arranging sensing equipment, and collecting multi-source heterogeneous data to form a data set; after data cleaning and time-space synchronization are conducted, standardized feature vectors are obtained through sectional physical perception standardization processing; constructing a graph neural network micro-area irrigation volume demand prediction model, and predicting recommended irrigation volume and soil salinity variation; calculating a loss function of the model and performing iterative training on the model; and performing periodic decision regulation and control circulation on the trained model, converting the output of the multi-source heterogeneous data collected at each decision moment through the model into an instruction, issuing the instruction, and synchronously performing drainage regulation and control. According to the invention, water-salt environment optimization regulation and control can be realized, and an intelligent treatment closed loop is formed.

The invention discloses an intelligent irrigation regulation and control system and method for dynamic balance of water and salt in saline-alkali soil, and belongs to the technical field of intelligent agriculture. Comprising the following steps: collecting dynamic monitoring data influencing the water-salt dynamic state and storing the dynamic monitoring data in a basic database; calculating the crop evapotranspiration water demand based on the data of the basic database; in combination with the calculated crop evapotranspiration water demand and data of the basic database, salt profile estimation is achieved, a dynamic target salt threshold value is set, the self-adaptive leaching water amount is calculated, the salt return risk is evaluated, and an evaluation report at the end of the growth season is generated; based on all calculation and evaluation results, key strategy control parameters for guiding irrigation are generated and optimized by adopting a reinforcement learning algorithm; generating a self-adaptive irrigation strategy and auxiliary measure suggestions by combining all the obtained results and fusing weather forecast data; the irrigation strategy is converted into an irrigation and drainage executable instruction, and meanwhile, the execution state of irrigation and drainage is monitored to be used for achieving double-path feedback.

The invention discloses a long-distance water-salt dynamic regulation and control method and device, a medium and a product, and relates to the technical field of ecological management, and the method comprises the steps: periodically obtaining monitoring data through a real-time monitoring network; determining the opening degree of a flow valve based on a partial pressure technology according to the water pressure and flow data of each node of the water delivery pipe network, and dynamically adjusting the water pressure and flow of each shunt branch in the water delivery pipe network according to the opening degree of the flow valve; according to the water content of the artificial soil layer, a water supplementing strategy is determined based on a vegetation water demand model; according to the salinity value of the artificial soil layer, on the basis of a salinity accumulation risk model, salt control closed-loop control based on a high salinity water active suction band-off mechanism is carried out; according to the invention, dynamic, accurate and closed-loop management of moisture and salinity can be realized.

According to the coastal saline-alkali soil water storage system device and the application thereof, on the basis of the characteristics that water and salt in coastal saline-alkali soil are actively transported, and the salinity change amplitude in an irrigation canal is large, ground surface reservoirs of different sizes are laid between field parcels, and the water flow direction of the reservoirs is judged through real-time conductivity data of pond water, canal water and irrigation water; the salt gradient controllable water storage system is formed and controlled according to salt tolerance threshold values of nearby crops, so that the irrigation and salt leaching requirements of different crops in different seasons are met. The water storage device can input the capacities of different reservoirs, crop salt tolerance thresholds, irrigation water demand and the like, estimates the field covered by the water storage device, and optimizes the cultivation mode planning. The device can accumulate irrigation water in different salinity ranges under the condition that the salinity of a surface water body changes drastically, can fully utilize different water sources such as surface water and rainwater, and is very suitable for coastal salinization farmland with relatively rich water resources.

The invention discloses an optimal configuration method for land utilization of a cultivated wasteland in a salinization irrigation area, which mainly comprises two parts of land utilization quantity demand and cultivated wasteland spatial layout, and utilizes a method of coupling a water-salt equilibrium model SALTMOD and a land utilization CLUE-S model. The method comprises the following steps: combining an appropriate tillage and waste land ratio based on irrigation and drainage regulation and control and cultivated land salinity control with land utilization space distribution, and systematically exploring an appropriate salt wasteland space dynamic regulation and control scheme suggestion considering land utilization development and regional salinity income and expenditure balance from quantity constraint and space configuration; certain technical and data support is provided for saline-alkali soil treatment in arid and semi-arid irrigated areas.

The invention discloses a test device for testing water-salt migration and shear strength of a novel partition layer of a salinized soil roadbed under THMC coupling conditions and a use method of the test device. The device comprises a water-salt migration system, a temperature control system, a vertical loading system, a horizontal shear system and a data monitoring system. Wherein the temperature system simulates roadbed temperature difference, the water-salt system reproduces internal water-salt migration, the vertical loading simulates an upper load, the horizontal shearing system directly measures the strength of a soil sample, and the data system monitors and records moisture, salt, temperature, stress and settlement changes in the soil sample in real time. The device can simulate a complex THMC coupling environment, reveal water and salt migration, temperature stress distribution and settlement rules, and can execute a direct shear test under the condition of keeping the original state of a soil sample. On the whole, the method has high feasibility, practicability and applicability, and a powerful tool is provided for salinized soil roadbed research.

The invention relates to the field of specific calculation models, and discloses a natural regulation type salinized soil desalination simulation and multi-objective optimization configuration method, which comprises the following steps of: 1, data acquisition and earlier stage processing; 2, constructing a water and salt migration model; step 3, simulation analysis and scheme optimization; 4, carrying out substitution model training and multi-objective optimization; the final scheme is directly used for guiding engineering implementation, and specifically comprises the steps of determining the terrain adjustment amplitude, the position and depth of a drainage ditch, the micro-topographic relief scale, the earth filling and digging volume and shallow guide and drainage path configuration. The method has the beneficial effects that the natural drainage capacity of regional underground water can be remarkably improved, the effect that evaporation drives salt to move upwards is weakened, the rainfall infiltration capacity is improved, and the natural leaching effect is enhanced. The method is suitable for areas such as mud flats, salt pans and natural reserves where artificial engineering measures are not suitable to be taken, and has the advantages of low cost, high stability, ecological friendliness and the like.

The invention provides a comprehensive benefit evaluation method and system for saline-alkali soil improvement based on drainage basin water-salt balance, and belongs to the technical field of agricultural ecological management. The method comprises the following steps: collecting and preprocessing geographical partition data, soil hydrological data, crop salt tolerance data and irrigation management data; constructing a salt migration-yield coupling model, namely establishing a salt migration dynamic equation, substituting the preprocessed data into the salt migration dynamic equation, and calculating the downstream salt concentration; a yield response model is established, the downstream salinity concentration and the preprocessed data are substituted into the yield response model, and the upstream treatment area increased yield and the downstream reduced yield are calculated; and calculating the net benefit value of saline-alkali soil improvement according to the upstream treatment area yield increase and the downstream yield reduction. According to the method, the salinity increment, exceeding the salt tolerance threshold value, of the soil of the treatment area is considered, overall systematic evaluation is carried out on upstream and downstream yield changes, and therefore reliable guidance is provided for selection and optimization of irrigation measures.

The utility model discloses a water-salt co-production system using natural energy for zero-carbon operation, and belongs to the technical field of seawater desalination. According to the technical scheme, the device comprises a sunlight shed, a plurality of brine tanks are arranged in the sunlight shed, and the brine tanks are connected with a brine tank through pipelines; a plurality of cloth curtains are hung above the brine tank in the sunlight shed, and the lower ends of the cloth curtains are immersed in brine in the brine tank; a fresh water collecting tank and a rainwater collecting tank are arranged at the bottom of the sunlight shed, the fresh water collecting tank is positioned inside the sunlight shed, the rainwater collecting tank is positioned outside the sunlight shed, and the fresh water collecting tank and the rainwater collecting tank are respectively connected with the fresh water tank through pipelines. According to the zero-carbon water-salt co-production device, natural energy sources such as solar energy, wind energy and ground temperature energy are utilized for comprehensively utilizing brine, all-day operation is achieved, water and salt are obtained, fresh water can be obtained in sunny and rainy days, and zero-carbon water-salt co-production is achieved.

The invention discloses a dual-function coupling device for synchronously enhancing photo-thermal evaporation water-salt separation and super capacitor performance. An upper electrode, a water conveying layer and a lower electrode are arranged above a water tank from top to bottom and are tightly attached to each other; the front extending section of the water conveying layer penetrates through a heat insulation layer arranged on the top of the water tank to make contact with seawater in the water tank, the rear extending section of the water conveying layer reaches a side salt precipitation layer arranged on the outer side of the water tank, the upper electrode serves as a photo-thermal / evaporation interface, seawater in the water conveying layer serves as electrolyte, and the water conveying layer serves as a diaphragm. The upper electrode, the water conveying layer and the lower electrode are tightly attached to form a supercapacitor structure, the device can synchronously perform solar photo-thermal evaporation water-salt separation and supercapacitor energy storage, and meanwhile, the device shows a synergistic enhancement effect when working; heat generated in the charging and discharging process of the supercapacitor can improve the evaporation rate to promote water-salt separation.

The present invention provides a method and device system for preparing sodium carbonate and / or sodium bicarbonate and co-producing ammonium sulfate from sodium-based wastewater. According to the phase equilibrium law of a multi-component water-salt system, through the regulation of crystallization kinetics and supersaturation, the sodium-based wastewater does not need to be evaporated and crystallized to produce sodium sulfate solid. Instead, the wastewater after simple pretreatment is directly treated to achieve gradient crystallization separation of sodium sulfate, ammonium sulfate and sodium bicarbonate, thereby obtaining high-quality sodium bicarbonate, sodium carbonate and ammonium sulfate products.

The invention discloses a saline-alkali soil water-salt-fertilizer real-time monitoring system and method based on the Internet of Things, and relates to the technical field of saline-alkali soil monitoring. Multi-parameter sensor nodes are arranged in a preset area to collect soil salinity, moisture, conductivity, pH value and ground temperature information; acquiring a remote sensing image, terrain elevation and land utilization type data, and performing preprocessing and spatial registration; based on the spatial position relation, the hydrological connectivity and the irrigation and drainage structure, establishing a spatial graph structure required by graph neural network input; deploying a model on the constructed graph, and predicting the future salinity trend or saline-alkali risk grade of each monitoring unit; utilizing adjacent node features and an edge weight propagation mechanism to realize prediction extrapolation of a data sparse region; based on a prediction result and an agronomic rule, generating a multi-objective optimization regulation and control scheme through an evolutionary strategy algorithm; and displaying the prediction map, the risk map and the regulation and control suggestions, and triggering early warning and control linkage when the threshold value exceeds the limit.

The invention provides a pretreatment system for desalting a salt-containing alcohol-water mixture. The pretreatment system comprises a coarse separation tower and a dehydration tower, a bottom extraction port of the coarse separation tower is connected with an extraction port of the dehydration tower, and an extraction port at the bottom of the dehydration tower is connected with a coarse salt-containing mixture pipeline and a salt-containing pipeline; an extraction port at the top of the dehydrating tower is connected with an extraction port of the phase-splitting tank, an extraction port of the phase-splitting tank is connected with a water recycling pipeline and a return pipeline, and water, salt and fusel components are continuously separated and removed through the pretreatment system of the coarse separation tower and the dehydrating tower, so that equipment blockage is avoided, the separation energy consumption is reduced, and the operation intensity is reduced. The coarse separation tower and the dehydration tower have rectification and crystallization coupling effects, the purpose of separating water, salt and a target product can be achieved at the same time, the simplest process flow is achieved, the number of equipment is reduced, the occupied area is small, and the cost is further saved.

The application of "a unit type tidal wetland restoration method based on a target" belongs to the technical field of wetland ecosystem restoration methods. The unit type tidal wetland restoration method based on a target comprises the following steps: (1) determining a target; (2) constructing an ecological unit on the tidal wetland to be restored through microtopographic modification; (3) applying biochar materials and salt-resistant ecological materials in the ecological unit; and (4) configuring waterfront plants in the ecological unit. The restoration method utilizes natural tidal fluctuation to adjust the water and salt conditions of the ecological unit (salt reduction of more than 80%) and to maintain the target water level (0-2 m) as needed, optimizes the soil microbial community structure (soil bacterial richness is increased by more than 200%), improves the plant germination rate and survival rate in the process of tidal restoration (the germination rate is more than 90%, and the survival rate is increased to more than 62%), and enriches the plant configuration varieties in the riparian zone (≥12).

The invention relates to a device for simulating the influence of underground water level and rainfall on the salt elimination effect of a saline-alkali soil concealed conduit, and belongs to the technical field of saline-alkali soil experiments. The device comprises a box body, the box body is communicated with the concealed conduit, a drainage pipe and a water inlet pipe, the concealed conduit is laid in the box body, one end of the concealed conduit is communicated with the outside of the box body, and the communicating position of the water inlet pipe and the inside of the box body is located below the concealed conduit; the communicating part of the drainage pipe and the box body is positioned below the water inlet pipe; a rainfall simulation mechanism is arranged on the box body, the rainfall simulation mechanism comprises a transverse pipe, a plurality of vertical pipes and an adjusting assembly, the transverse pipe is erected at the top of the box body and stretches across the box body, one end of each vertical pipe is communicated with the transverse pipe, and the adjacent vertical pipes are arranged at intervals in the length direction of the transverse pipe; the adjusting assemblies are used for changing the water outlet postures of the ends, away from the transverse pipe, of the vertical pipes, the multiple adjusting assemblies are arranged and correspond to the vertical pipes in number, and the application has the effects that the influence data of the underground water level of the saline-alkali soil and rainfall on saline-alkali soil concealed conduit salt elimination can be conveniently obtained, and the migration law of local water and salt is summarized.

Methods of separating water, salt, CO2, and crude oil from wastewater, the methods comprising: providing gas / oil separation system that produces a waste saline water stream and a CO2 stream; providing an electrochemical cell having an anode, a cathode, and three electrodialytic compartments; feeding a fresh water stream to the anode to produce H+ and O2; feeding the waste CO2 stream and O2 to the cathode to produce bicarbonate (HCO3—) and hydroxide ions (OH−); feeding the waste saline water stream to a center electrodialytic compartment; wherein the sodium Na+ from the waste saline water stream reacts with the bicarbonate to form NaHCO3 and the chloride (Cl−) from the waste saline water stream reacts with the H+ to produce hydrochloric acid; and producing salt and desalinated water.

The invention relates to the technical field of water-salt distribution, and discloses a simulation system and method for water-salt evolution of an island aquifer under the influence of underground structures, and the method comprises the steps: prefabricating standard dyeing seawater by adopting NaCl and carmine; diluting standard dyeing seawater in proportion to prepare saturated sand column standard samples with different salinity gradients, and collecting profile images of the saturated sand column standard samples; extracting the average gray value of the section image of each saturated sand column standard sample and the corresponding global temperature and salinity; fitting the average gray value, the global temperature and the salinity corresponding to the saturated sand column standard sample, and establishing a global temperature coupled salinity inversion model; acquiring an experiment profile image and an experiment global temperature of the sea island aquifer water-salt evolution experiment under the influence of the underground structure; and generating a two-dimensional salinity distribution data field according to the salinity inversion model, the experimental profile image and the experimental global temperature. The full-profile image of the aquifer to be measured is collected in real time, the relation between the light intensity and the salinity is established, interpolation processing is not needed, and the simulation result is more accurate.

The invention relates to the technical field of environment monitoring, in particular to a water-salt ratio dynamic monitoring method and system for farmland, and the method comprises the following steps: collecting multi-point tension and conductivity data, carrying out the ratio judgment, delaying the collection if a threshold value is exceeded, synchronously updating a data set, converting salt, calculating the change of the water-salt ratio, and fitting a trend to obtain change information. Evaluating water stress in combination with crop parameters, judging a water demand period, superposing predicted rainfall to generate an interference result, and calculating a water-salt change acceleration recognition intervention point. According to the method, through the water stress index constructed by fusing the transpiration potential base value of the crop and the water content of the root layer, accurate identification of the water demand period of the crop is realized, comparison with the predicted rainfall time interval is carried out, and trend key points influenced by rainwater disturbance are screened; a continuous acceleration change section is identified through a water-salt ratio acceleration sequence formed by a change rate difference value, and an intervention demand point is marked in time under the condition that a continuous trend is enhanced.

The application discloses a power plant water-energy-salt cascade reuse system for flue gas drying integrated coupling, to solve the problems of low resource utilization efficiency and high energy consumption in the zero discharge technology of power plant wastewater. Through the technologies of circulating cooling water cascade reuse, desulfurization wastewater efficient concentration treatment, desulfurization concentrated water flue gas drying treatment and intelligent monitoring and control unit, the efficient reuse of water, salt and energy in the wastewater is realized. The wastewater is treated through multiple membrane processes such as ultrafiltration, nanofiltration and reverse osmosis, so that the cascade water quality reuse for different purposes is realized. The calcium and magnesium ions are extracted through chemical precipitation and used as industrial raw materials, effectively alleviating the membrane pollution problem of subsequent processes. The high-salinity wastewater is dried by flue gas waste heat to produce industrial salt, realizing the recovery of salt resources. The system adopts an intelligent monitoring and control system, realizes real-time monitoring and automatic adjustment, optimizes the operation efficiency of each treatment unit and reduces energy consumption. The application realizes near-zero discharge of wastewater and efficient reuse of resources, and has significant economic and environmental benefits.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a saline-alkali soil sand-peat layered improvement structure and an improvement regulation and control method.The saline-alkali soil sand-peat layered improvement structure sequentially comprises a dry branch and fallen leaf covering layer, a sand-peat mixed layer, a peat layer and a mineral gleying layer from top to bottom, and an irrigation pipeline layer is arranged in the sand-peat mixed layer and / or the peat layer; the mixing mass ratio of the sandy soil to the peat soil in the sand-peat mixing layer is (3-5): 1, the particle size of the sandy soil is 0.1-0.5 mm, and the content of organic matters in the peat soil is 30-50%. According to the sand covering-peat layered improved structure for the saline-alkali soil and the improved regulation and control method, through the design of the sand covering-peat layered structure, the dry branch and fallen leaf covering layer, the sand-peat mixed layer, the peat layer and the mineral gleying layer are arranged, water and salt migration and organic matter distribution are optimized, the local microbial activity of soil is induced to be improved, and the soil quality is improved. The improvement effect is dynamically evaluated by combining an enzyme activity threshold value in a CASH system.

The invention discloses a saline-alkali cultivated land improvement method and system based on dynamic irrigation and drainage regulation, and relates to the technical field of irrigation and drainage regulation, and the method comprises the steps: obtaining soil salinity data, soil moisture data and crop growth data of a cultivation region, extracting salinity migration parameters and water demand parameters, and constructing a water-salt coupling model; performing gridding zoning on the region by combining the salinity concentration distribution and the crop growth period, and calculating the irrigation water amount and the irrigation time of each regulation and control unit; in the irrigation process, root zone salinity and underground water level data are collected, the salinity return moment is recognized, drainage delay is calculated, and the initial drainage moment is obtained; the leaching depth is determined according to vertical distribution of salt in the root zone, evaluation indexes are established in combination with the growth period, drainage time sequences of adjacent regulation and control units are coordinated, and coordinated drainage moments are obtained; and generating an irrigation and drainage regulation and control instruction according to the irrigation and drainage parameters, and outputting and executing. According to the method, dynamic regulation and control of the irrigation and drainage process are achieved, salt drainage efficiency is improved, and salt return is inhibited.

The invention belongs to the technical field of civil engineering and material science, and discloses a water-salt-temperature multi-field coupling effect environment simulation test system and test method.The system comprises a hydraulic system, a main testing machine system and a constant-temperature water tank system; and the hydraulic system is connected with a hollow oil cylinder on the main test box through a corresponding pipeline in the pipeline assembly and is placed on the left side of the main tester system. According to the invention, the water tank and the main test box can be controlled by the control system to realize the test process of freeze-thaw cycle, dry-wet cycle and salt solution freeze-thaw cycle; dry-wet cycle, salt freeze-thaw cycle and dry-wet cycle-salt freeze-thaw cycle alternate tests can be carried out on the sample; a main testing machine system is provided with an advanced water, salt, temperature, stress and strain real-time sensing monitoring and data acquisition system, and an intelligent environmental action simulation control operation system improves the automatic and intelligent control level of test research work, greatly reduces the manual test monitoring time, and facilitates research work of researchers.