234results about How to "Conserve fresh water resources" patented technology

The invention relates to sea sand powder concrete. The sea sand powder concrete comprises, by weight, 450-750 parts of cement, 250-450 parts of active mineral admixture, 50-150 parts of inert admixture, 850-1400 parts of sea sand, 24-32 parts of high efficiency slushing agents, 145-220 parts of seawater, 2-4 parts of organic fiber and 78-250 parts of copper-bearing steel fiber with the thickness ranging from 0.08 mm to 0.35 mm. According to the sea sand powder concrete, a compact stacking structure principle is adopted, the interior of the concrete is almost seamless in communication channel through optimization of particle size gradation, and a channel of internal ion medium migration is further eliminated through secondary hydration of the active mineral additive, so that the powder concrete obtained by stirring the raw materials through the seawater and the sea sand is ultra-high performance concrete with high durability, corrosion resistance and high mechanic property.

The invention provides a saline-alkali soil brackish water film mulching drip irrigation processing tomato planting method, which comprises the following steps: (1) planting processed tomatoes: planting the processed tomatoes by adopting a manner of wide rows and high ridges, and mulching a white film above plants; (2) laying out a drip irrigation system, wherein an interval b between the drip irrigation systems is 48 to 52 cm; an interval a between drip emitters is 0.25 to 0.35 m; (3) carrying out high-frequency and small fixed amount water irrigation in a growing period of the processed tomatoes: alternatively irrigating brackish water and fresh water, and adopting the fresh water for irrigation in a seedling stage, and no irrigation in a red-mature period. The invention puts forward a cultivation method taking the brackish water and saline-alkali soil as targets in combination with the realities of shortage of fresh water resources, abundant underground brackish water resources and serious soil salinization in an arid region and a semi-arid region, and not only moisture is enabled to be held up within a field microcirculation of soil-and-film, deep seepage losses of the moisture are greatly reduced, but also under-film soil evaporation is remarkably lowered, sources of soil secondary salinization are cut off and the surface accumulation of salt is eliminated.

The invention discloses a water supply pipeline leakage loss monitoring and leakage positioning method and system. The method comprises the following steps that a whole water supply pipe network areais partitioned in a closed mode, a multifunctional leakage monitor and a remote water meter at the front end of the water supply pipe network are used for monitoring flow, pressure and water consumption indexes of all partitions, and then a metering model algorithm is used for conducting partition leakage metering; noise data in the water supply pipe network is acquired in real time by using noiserecorders arranged in each partion of the water supply pipe network, and a leakage pipe section is determined by using a frequency spectrum filtering and frequency spectrum comparison method; the noise recorders are installed at the two ends of the leakage pipe partition respectively, and noise data are further collected to achieve positioning of leakage points. A systematic monitoring means frompartitioned leakage monitoring to suspected leakage pipe section positioning and then to specific leakage point positioning is realized. According to the method, the whole area is broken up into parts, and management and control of leakage of the water supply pipe network are achieved through a small number of devices in a face-to-line mode and a line-to-point mode.

The invention discloses a sponge community rainwater comprehensive utilization system which comprises a hydrocone type roof rainwater collecting system, a main rainwater pipe network, an initial rainwater storage tank, a rainwater storage pool and a pumping water pump. The sponge community rainwater comprehensive utilization system is characterized in that the initial rainwater storage tank and an underground regulating pool are arranged over and under the ground respectively, and under the action that rainwater flows into a regulating mechanism, initial rainwater flowing through a water collecting pipe can flow into the initial rainwater storage tank, and later rainwater is drained into the rainwater storage pool through a water outlet pipe. A rainwater utilization method comprises the steps of collecting the initial rainwater on the roof, collecting the initial rainwater on the ground, distributing and purifying the initial rainwater, settling the initial rainwater, overflowing the rainwater, utilizing the initial rainwater, reusing the rainwater in the rainwater storage pool and collecting greenbelt seepage water. According to the rainwater comprehensive utilization system and method, when the initial rainwater storage tank is full of the water, the later rainwater directly flows into the underground rainwater storage pool, therefore, separating and distributing processing and utilizing of the initial rainwater and the later rainwater are achieved, the beneficial effect is significant, and application and popularization are convenient.

The high-yield cultivation technique of wheat in saline-alkali field includes the following measures: selecting salt-resistant fall wheat species seed, using organic fertilizer as main fertilizer andusing microelement fertilizer for saline-alkali field crops as auxiliary fertilizer, selecting DEkang 961 as cultivatino species, before sowing, in tenth-twentieth of October, adopting wild flooding irrigation method, watering, salt-pressing and making moisture, after 3-5 days ploughing under to great depth and making land preparation, then film-covering and hole sowing with 1-3 days, after reviving in spring and when the first new leaf is grown and second new leaf is only produced spraying 20% mepiquat chloride paclobutrazol microemulsion on foliage.

The invention relates to a high-yield cultivation method for honeysuckle on saline and alkaline land. The method includes the key technical steps: selecting 'great mullein' breeds and two-year seedlings; selecting the saline and alkaline land with the salt content of 0.2%-0.3% and pH (potential of hydrogen) of 7.5-8.5; building a drainage system, plowing the land and excavating planting holes; applying 15kg of decayed farm manure and 250g of saline and alkaline land crop compound fertilizers as basic fertilizers in the holes; timely changing soil, planting the honeysuckle and covering black plastic films; reasonably performing pruning and topdressing; comprehensively preventing insect diseases; timely harvesting the honeysuckle; and the like. The honeysuckle is planted on a light saline and alkaline land parcel by the method, so that plants can normally grow and develop, saline and alkaline land resources are sufficiently used, the ecological environment of the saline and alkaline land can be improved, and the land can be improved step by step. Compared with a common planting method, the method has the advantages that the survival rate of the honeysuckle plants reaches 100%, the yield of five-year grown plant medicinal materials is increased by 86.3%, the content of chlorogenic acid and galuteolin is slightly improved and meets 2010 edition standard requirements of China Pharmacopeia, and the method is simple, practicable, easy to operate, remarkable in economic, ecological and social benefit and wide in popularization and application prospect.

The invention discloses a rainwater collecting and retreating device. The device comprises a rainwater collecting device, a settling device, a connecting device, a first filtering device, a motor device, a second filtering device and a discharge device, wherein the rainwater collecting device comprises a rainwater collecting frame, first supporting rods, a first pipeline and a first valve, the settling device comprises a first frame body, a first filter screen, first springs, a first support, a first sponge block and a second spring, the connecting device comprises a second pipeline, a second valve, a second support, a third support and a first slant rod, the first filtering device comprises a second frame body, a sealing ring, a second filter screen, a second support rod, a third support rod and a third pipeline, the motor device comprises a motor, a rotating shaft, first stirring rods, second stirring rods, first bristles, a locating shaft, a fourth support, a first cross bar and a fifth support, and the second filtering device comprises a third frame body, a roller, second bristles, a sixth support, a fourth pipeline and a third valve. The rainwater collecting and retreating device disclosed by the invention can effectively collect rainwater, and precipitates and filters rainwater.

The invention relates to a method for fast and efficient improvement greening of coastal saline soil. The method comprises a step 1) of digging a planting trough, a step 2) of laying a horizontal salt drainage system; a step 3) of laying a vertical salt drainage ventilation system; a step 4) of performing soil structure improvement; a step 5) of performing irrigation leaching and a step 6) of performing soil fertility improvement and nursery stock transplanting maintenance. According to the method, the leaching efficiency and a desalting effect of the coastal saline soil are improved. By adoption of the method, horizontal and vertical motion of irrigation leaching water in soil can be improved, irrigation leaching water salt leaching efficiency and drainage and desalting efficiency of the horizontal and vertical salt drainage systems are improved, and the saline soil improvement time is shortened.

The invention provides a special pump for collecting and transporting underground bittern and a process for preparation. The pump comprises an impeller, a water inlet part, and a submersible motor from top to bottom, and is penetrated by a pump shaft. The pump is characterized in that the impeller is designed into a semi-open impeller structure, a diversion core is arranged on the upper portion of the impeller, a guide blade is mounted on a conical face of the diversion core, a diversion casing is arranged on the peripheries of the diversion core and the guide blade, a water jacket is arranged on the periphery of the submersible motor, a fresh water intake pipe is arranged on the lower end of the water jacket, a fresh water spray hole is arranged on the conical bottom of the water inlet part, and motor metal bearings are respectively arranged on the upper portion and the lower portion of the submersible motor. The invention polishes each over-current surface, reduces the rotary speed of the motor, and arranges the water jacket on the periphery of the submersible motor, and fresh water are transferred into the water jacket to positively cool up the motor. The invention has high working efficiency, low operation costs, and saves fresh water resource, retards the crystallization velocity of bittern on the over-current surface, and increases five times of operation life.

The invention discloses a cross-linking agent applicable to highly-mineralized water fracturing fluid. The cross-linking agent is stable complex which is formed by reaction of a zirconium compound, a boron compound with a chelating ligand and bridging ligand in aqueous liquor. The zirconium compound is zirconium acetate or zirconium oxychloride with content of 9wt%-18wt%; the boron compound is boric acid or borax with content of 3wt%-40wt%; the chelating ligand is N, N-di(2-hydroxyl ethyl) glycine with content of 9wt%-18wt%; the bridging ligand is one, two or a mixture of more than two of glycerol, mannitol, sorbitol and triethanolamine, with content of 5wt%-19wt%, and the balance of water. The cross-linking agent disclosed by the invention can be cross-linked with a thickening agent under a weakly alkaline condition, not only contains heavy metal zirconium, but also contains boron, so that damages to stratums by the fracturing fluid are effectively lowered; moreover, highly-mineralized water can be adopted to directly prepare the fracturing fluid, so that fresh water resources are saved, and expenditure cost of oilfield enterprises in treating and producing highly-mineralized water is reduced.

The present invention relates to one kind of composite scale and corrosion inhibitor suitable for circular cooling water with high concentration multiple. The composite scale and corrosion inhibitor consists of amino acid 15-30 wt%, phosphonyl maleic anhydride polymer 5-20 wt%, acrylic acid-acrylate copolymer 5-15 wt%, humate 0.5-2.0 wt%, benzotriazole 0.5-2.0 wt%, organic phosphonate 5-15 wt% and hydroxide 8-15 wt%, except deionized water.

The invention provides an intelligent rainwater car washing system which is characterized by comprising a rainwater collection unit (1), a rainwater purification unit (2), a clean water pond unit (3), a car washing room unit (4), a waste water reusing processing unit (5) and an intelligent control unit (6), wherein a water outlet pipe (1-3) of the rainwater collection unit (1) is connected with a water inlet pipe (2-1) of the rainwater purification unit (2), a water inlet pipe (2-5) of the rainwater purification unit (2) is connected with a water inlet pipe (3-1) of the clean water pond unit (3), a water supplying pipe (3-3) of the clean water pond unit (3) is connected with a water inlet pipe (4-4) of the car washing room unit (4), and car-washing waste water of the car washing room unit (4) flows into a waste water collection pipe (5-1) of the waste water reusing processing unit (5). On-line motoring data and sending instructions of other units are collected by the intelligent control unit (6) to control operation of all unit equipment. The intelligent rainwater car washing system has the advantages of opening up new water resources, saving fresh water resources, and being environment-friendly, and has good society benefits and environment benefits.

The invention provides a method of purifying yeast wastewater by co-culture of chlorella and yeast. The method comprises the following steps: 1) performing activated culture on chlorella and yeast cells to obtain a chlorella seed liquid I and a yeast seed liquid I; 2) inoculating the chlorella seed liquid I into an improved basic culture medium, inoculating the yeast seed liquid I into a culture medium, and placing the media outdoors for culturing the seed liquids to obtain a chlorella seed liquid II and a yeast seed liquid II; and 3) dipping the chlorella seed liquid II to the yeast seed liquid II and inoculating the same into yeast wastewater needing to be treated to form a co-culture system for outdoor co-culture. Through three simple steps, the energy consumption and production cost of co-culture of chlorella and yeast can be effectively reduced by using a small amount of raw materials by means of light energy in a natural condition, and the yeast wastewater is treated on a large scale by means of microbial co-culture.

The invention discloses a thermal foaming or thermal bubble type printer digital printing process using a reactive dye ink; the digital printing process uses the reactive dye ink with high temperature resistance and long survivability; digital inkjet printing of cotton, silk, wool, linen and cotton fabrics can be realized on a thermal foaming or thermal bubble type printer, wherein the cotton, silk, wool, linen and cotton fabrics are not sized by use of a synthetic sizing agent prepared from urea, sodium alginate, nutmeg, cellulose or any paste material as a main raw material; the process is simple in step, less in water consumption, low in energy consumption, economic and environmentally-friendly, and solves the problems, in the prior art, of hydrolysis and alcoholysis of the reactive dye ink when the reactive dye ink passes through a thermal foaming or thermal bubble type printer head and crust formation and ink path blocking for the reason that high temperature of the printer head cause part of the reactive dye ink to be dried and pulverized into powder, and application of the reactive dye ink in the thermal foaming or thermal bubble type printer can be realized.

A seawater and sea sand concrete column comprises a polyethylene pipe and a plurality of FRP-steel composite reinforcements. The plurality of FRP-steel composite reinforcements are vertically arrangedin the polyethylene pipe, the plurality of FRP-steel composite reinforcements are arranged in the polyethylene pipe are evenly arranged in the circumferential direction in an equal-radian mode, FRP-steel composite stirrups are arranged outside the plurality of FRP-steel composite reinforcements, the polyethylene pipe is filled with concrete, and the concrete is composed of sea sand, seawater, cement and coarse aggregate. According to the invention, by adopting the polyethylene pipe on the outside and the FRP-steel composite reinforcements on the inside to constrain the concrete composed of the sea sand and seawater, the bearing capacity of the concrete column is improved, ductility and anti-seismic capacity are improved, corrosion resistance is prominent, and therefore the section size ofthe column is reduced, the use area of a building is increased, and the bending resistance is good.

The present invention relates to biomass and polysaccharide accumulation through spirulina culture, specifically to spirulina culture using the control of the addition of a nutritional salt so as to concurrently accumulate biomass and polysaccharides. According to the present invention, spirulina cells cultured to achieve a exponential growth phase are transferred into a nutrition limiting culture medium, natural illumination or artificial illumination is performed, culture is performed to achieve a stable phase, and the spirulina cells are harvested, wherein the biomass yield is 1-4 times the biomass yield of the culture under the rich nutrition condition, the polysaccharides yield is increased by 0.8-20 times compared to the culture under the rich nutrition condition, and the polysaccharide content achieves 45-80% of the spirulina dry weight, and is increased by 2-6 times compared to the culture under the rich nutrition condition; and the contradiction that the spirulina biomass and the polysaccharide cannot be concurrently accumulated is solved, the rapid and efficient spirulina polysaccharide production is achieved, the advantages of low nutrition salt consumption, low production cost, high polysaccharide content and the like are provided, the downstream processing operations are easily simplified, and the industrial production of the spirulina polysaccharide can be promoted.

The invention relates to cultivation of freshwater fishes, in particular to a technique of rearing fry of the obscure puffer in low salinity sea water. The technique includes: selecting a pond; sterilizing the pond; cleaning the pond; injecting water and applying fertilizer; preparing for use of oxygenation facilities, and stocking the fry; managing rearing; spreading a net for exercise, distributing the fry to more ponds, and domesticating and feeding. The technique is characterized in that fry bags are allowed to float in the ponds before estuary soil ponds are selected and the fry are put in; pond water is then injected into the bags; the fry bags are shaken and stocked until interior salinity and water temperature of the fry bags and the pond water are moderate; fry stocking density is 8000-10000 / mu; the water indexes include 5-15%. of sea water salinity, 16-28 DEG C of natural water temperature, larger than 5mg / L of dissolved oxygen, 7.5-8.5 of pH, and 30-50cm of transparency; when growing to 2.8cm long, the fry are domesticated with artificial feed; when growing to 3cm long, the fry are distributed into the ponds; the net is spread for exercise 1-2 days before distribution; stocking density of summerlings in each pond is 1500-5000 / mu.

The invention discloses a broad-spectrum bactericidal difenoconazole thermal fog formulation and a preparation method thereof. The difenoconazole thermal fog formulation contains difenoconazole, a surface active agent, a solvent, a synergistic agent and a stabilizing agent, and the weight percentages are as follows: 1-40% of difenoconazole, 5-30% of surface active agent, 0.1-3% of synergistic agent, 0.01-2% of stabilizing agent, and remaining solvent. The invention has the characteristics of good and fast effects, labor saving, drug saving, no limitations of landforms, tree heights and water sources, convenient application, and the like, which is applied to controlling various plant diseases of crops in forested areas, gardens and greenhouse rooms, such as powdery mildew, scab, anthrax, rust disease, leaf spot, etc.

The invention relates to an accumulated rainwater storage and permeation promotion method for an urban green land. The method includes the following steps of firstly, selecting a place where people can not get close or a hidden place for punching at the position, close to a roadside or the edge of a green land module, at the low position of the green land, wherein holes are distributed in a linear or arc mode, 0.5-1 hole is formed in each square meter, or the distance between the holes is 1-3 m, and the diameter of the drilled holes is 12-15 cm; secondly, filling the holes with composted organic compounds, and mixing the organic compounds with a water-retaining agent, wherein the water-retaining agent accounts for 0.1-0.2% of the organic compounds; thirdly, observing the preservation amount of filler in the holes, and supplementing the water-retaining agent according to the addition amount in the second step if the preservation amount is smaller than 30%. According to the method, by drilling holes in the soil body of the green land and filling the holes with the appropriate quantities of water-retaining agent and organic compounds, the green land can sufficiently absorb rainwater, rainwater is provided for growth of plants, the rainfall runoff is reduced, and the fresh water resource for irrigating the green land is saved.

The invention relates to the technical field of water treatment, and discloses a rainwater collection and treatment system based on a building drainage pipe. The rainwater collection and treatment system comprises the drainage pipe and a water collection hopper arranged at the upper end of the drainage pipe, a water inlet pipe is arranged on the side surface of the upper end of the drainage pipe,a rainwater filtering processor is connected to the outer end of the water inlet pipe, a water outlet pipe is arranged on the rainwater filtering processor, the outer end of the water outlet pipe is connected with a water tank, a split-flow pipe is arranged at the bottom of the rainwater filtering processor and is connected with the drainage pipe through a return pipe, an electrical control valveis arranged at the portion, located between the water inlet pipe and the return pipe, on the drainage pipe, the water tank is internally provided with a liquid level sensor, and when the liquid levelsensor detects that signals exist, the electrical control valve is switched on. The rainwater collection and treatment system has the advantages that after being collected and treated, the rainwater can serve as domestic water, and the fresh water resource is saved.

The invention discloses a concrete column with sea sand concrete and core rubber concrete. The concrete column with the sea sand concrete and the core rubber concrete comprises an outer-layer FRP pipe, an FRP-steel composite pipe, the sea sand concrete and the rubber concrete, the FRP-steel composite pipe is arranged in the outer-layer FRP pipe, and the position between the FRP-steel composite pipe and the outer-layer FRP pipe is filled with the sea sand concrete; the FRP-steel composite pipe is filled with the rubber concrete; and the FRP-steel composite pipe comprises a steel pipe body and FRP fiber cloth covering the external surface of the steel pipe body. According to the concrete column with the sea sand concrete and the core rubber concrete, original sea sand which is not subjected to desalting treatment can be directly used, the fresh water resource is saved, the desalting working procedure is omitted, and the utilization rate of the sea sand is greatly increased. In addition, the defects that a rubber concrete column is low in compressive strength, and peculiar smell is released are overcome, the engineering application fields of the rubber concrete are expanded, the utilization rate of rubber is greatly increased, and the concrete column with the sea sand concrete and the core rubber concrete has the beneficial effects of being high in bearing capacity, good in shock resistance and damping capacity, excellent in seismic performance and environmentally friendly.

The invention belongs to the technical field of saline-alkali soil improvement and particularly relates to a method of planting pomegranate tree in saline-alkali soil, comprising the following steps: S1, digging plant ditches, and laying a salt-isolating layer, a salt discharge layer, a humus layer and a foreign soil layer in each planting ditch; S2, planting pomegranate trees; S3, playing micro-wetting tubes; S4, backing fill with foreign soil; S5, laying mulching film; S6, irrigating, weeding and applying organic fertilizers to the pomegranate trees regularly; The method of the invention enables effectively reduced composition of saline-alkali soil, meets the pomegranate growth need for fresh water resources, enhances fertilizer efficiency in the saline-alkali soil, prevents disease and pest damage, enables pomegranate trees to grow well and increases pomegranate yield.

The invention discloses a marine culture biological cleanser and a preparation method thereof. The marine culture biological cleanser comprises the following components in percentage by mass: 5-18 ppm of chitosan oligosaccharide, 50-70% of sea water, 6-12% of biological bacterium solution, 6-12% of sucrose and 15-26% kelp dreg. The biological bacterium solution is a microbial preparation which is compounded and cultured from photosynthetic bacteria, bacillus and lactic acid bacteria. The chitosan oligosaccharide is prepared by the following steps: extracting chitin from Alaska queen crab, deacetylating the chitin to prepare chitosan, and carrying out enzyme digestion on the chitosan to obtain low-molecular weight chitosan. The invention saves the fresh water resources, lowers the cost and enhances the purifying effect for marine culture.

The invention discloses a water saving and fertilizer controlling ecologic governing and synergic utilizing method for a heavily salinized land. Ardealite is applied to the heavily salinized land; smash-ridging, subsoiling and uniform mixing are performed, and according to a soil salt control target, non-growth-period irrigation salt forcing is performed; after base fertilizer and humic acid are mixed, furrow application is performed, a drip irrigation zone is laid for membrane laminating and seed sowing, a soil depressimeter is embedded under the membrane, a geotechnical cloth is laid on theground surface between membranes, in the crop growth period, brackish water is adopted for drip irrigation water-fertilizer integration combined application of humic acid, according to the soil salt conditions and the crop water-fertilizer requirement characteristics, the drip irrigation moment is determined, and on the basis of the depressimeter, the irrigation water amount and the irrigation stopping time are determined. The problem that agricultural planting water resources in an arid region are lacked is solved, the requirement for salt control over saline-alkali soil farm irrigation is met, and the ecologic governing requirement for improving the saline-alkali soil water-fertilizer utilization efficiency and increasing production and income is met.

The invention provides a crosslinker for a recoverable polymer fracturing fluid, and a preparation method and an application thereof. The crosslinker can be re-crosslinked with polymer molecules in agel breaking fluid to form a fracturing fluid by a complexing reaction. The crosslinker includes the following components by the mass percentage: 3%-8% of a high-valence metal salt, 12%-18% of a polyhydroxy compound, 0.5%-2% of a regulator, 2%-6% of a surfactant, 1%-2% of an anticoagulant and 64%-81.5% of distilled water. The crosslinker can be re-crosslinked with the polymer molecules in the gelbreaking fluid by the high-strength complexing reaction to form the fracturing fluid, the crosslinking property is not affected by substances such as crude oil, metal ions, mechanical impurities and the like in a flowback liquid, the problem of treatment of a backflow fracturing fluid can be effectively solved, the fresh water resources for fracturing is saved, the water preparation period is shortened, and the construction efficiency is improved.

The invention relates to a method for preparing calcium sulphate crystal whisker. The method takes sea water and bittern as raw materials, combines the comprehensive utilization of the sea water, lowers the cost, simplifies the process and is easy to realize the industrialization. The method comprises the following processes of evaporating crystallization, crystal whisker conversion, filtration and washing and salting-out evaporation. The concentrated sea water after desalted or the moderate bittern in the salt manufacturing process is put in an evaporated crystallizer to be evaporated and concentrated so that the granular calcium sulphate crystal is separated out; the calcium sulphate crystal and a feed liquid prepared by the mother solution after the evaporation according to the solid / liquid mixture ratio of between 5 and 10 percent are put in a reaction kettle to translate into the calcium sulphate crystal whisker, the reaction temperature is between 100 and 200 DEG C, the reaction pressure is between 0.1 and 0.5 MPa, and the reaction time lasts for 0.5 to 2 hours; the calcium sulphate crystal whisker is filtered, washed and dried so that the calcium sulphate crystal whisker product is prepared; and the remaining mother solution obtained by filtering the crystal whisker converting reaction liquid is evaporated and concentrated further to separate out the sodium chloride crystal.

The invention provides a recovery method of vanadium-containing neutralizing slag. The recovery method comprises the following steps of mixing the vanadium-containing neutralizing slag, concentrated sulfuric acid and water to obtain slurry; adding a reducing agent in the slurry, and performing reduction leaching; performing solid-liquid separation on the slurry obtained after reduction leaching, and cleaning filter residue with a sodium sulfate solution to obtain a vanadium-containing leaching solution and calcium-rich slag; adding ammonium sulfate in the vanadium-containing leaching solution,regulating the pH value of the leaching solution with ammonia water, performing cooling crystallization, and performing solid-liquid separation to obtain an ammonium alum crystal and a neutralizationsolution; and performing counter-current extraction, counter-current back extraction, upflow regeneration and counter-current washing on the neutralization solution, thereby obtaining a high-purity vanadyl sulfate solution. According to the recovery method, when the pollution of a vanadium element in the vanadium-containing neutralizing slag to environment is solved, the high value-added resourceutilization of the calcium-rich slag and the vanadium element in the vanadium-containing neutralizing slag is realized.

The invention discloses a salty water-fresh water replacing and leaching desalting device for a coupled phreatic aquifer. The device comprises a field desalting assembly, a saline water treatment assembly and a rainwater collection wetland. The field desalting assembly comprises a plurality of desalting units, a water inlet component and a drainage component, and each desalting unit comprises a desalting unit contour, a water inlet branch part and a partition plates; the saline water treatment assembly comprises a sedimentation tank, an overflow weir, an ecological corridor and a filter pipe;and the rainwater collection wetland comprises a water-impermeable layer, a water collecting tank, a water distribution well, a perforated communicating pipe and a water storage porous medium. According to the invention, underground water of saline-alkali soil is changed, and the underground water is gradually desalted through a plurality of cycles; and on the other hand, a mode of rotation irrigation of brackish water and rainwater is adopted, so that precious fresh water resources in coastal regions are saved, collected rainwater is fully utilized to be added into the cycle of the underground phreatic aquifer, and therefore, the problem of desalination of coastal saline-alkali soil is fundamentally solved.

The energy-saving environment-friendly vegetable planting method mainly comprises the following steps: focusing sunlight, guiding sunlight to places without enough sunlight illumination via optical fibers, planting, and providing demanded nutrition to plants by utilizing waste product, organic household refuse and sanitary wastewater. Therefore, the purposes of protecting the environment, saving the energy and expanding the planting space are achieved.

The invention discloses a method for treating the backflow fracturing fluid reclaimed from exploitation of shale gas. The method comprises the following steps: (S1) detecting the content of ions in the backflow fracturing fluid, and filling the backflow fracturing fluid which is up to the standard in a container for later use, wherein if the content of K<+> is controlled to be less than or equal to 1,500mg / L, the content of Ca<2+> is controlled to be less than or equal to 600mg / L, the content of Na<+> is controlled to be less than or equal to 2,000mg / L, the content of Mg<2+> is controlled to be less than or equal to 1,000mg / L, the content of NH<4+> is controlled to be less than or equal to 600mg / L, the content of total Fe is controlled to be less than or equal to 25mg / L, the content of Cl<-> is controlled to be less than or equal to 3,000mg / L, the content of Al<3+> is controlled to be less than or equal to 30mg / L, the content of SO4<2-> is controlled to be less than or equal to 200mg / L, and the content of COD is controlled to be less than or equal to 300mg / L, the backflow fracturing fluid is deemed to be up to the standard; and (S2) carrying out comparison test on the backflow fracturing fluid which is up to the standard and is filled in a container for later use with two formulas before the backflow fracturing fluid is injected underground to be used for fracturing, and evaluating the kinematic viscosity of slippery water. The method disclosed by the invention is particularly suitable for treating the backflow fracturing fluid immediately after the backflow fracturing fluid is reclaimed or without exceeding 10 days after the backflow fracturing fluid is reclaimed and stored. By adopting the method, various mechanical impurities, ions and bacteria affecting the reclamation of the backflow fracturing fluid can be removed, the treated backflow fracturing fluid can meet the reuse requirement, the water consumed for exploiting the shale gas can be reduced greatly, and the win-win goal of reducing cost and protecting environment can be realized.