45results about How to "Fast desalination" patented technology

A high-rate hydrothermal cleanup (HCU) process and system is disclosed for the rapid hydrolysis of renewable oils and reduction of inorganic and organic contaminants, such as salts, minerals, metals, asphaltenes, polymers, and coke precursors in both renewable oils and petroleum fractions. The process and system is characterized by a very short residence time, high-temperature, high-pressure, turbulent flow, hydrothermal operation. The HCU and integrated vapor-liquid separation system and process results in high yields of oil product that contains significantly reduced concentrations of inorganic and organic contaminants. The process may be operated to produce a concentrated clean glycerin byproduct and short-chain and long-chain free fatty acid product streams. The integrated vapor-liquid separation system and process performs at near atmospheric pressure by taking advantage of the water employed in the cleanup process and the energy imparted by the HCU reactor and eliminates the need for vacuum distillation.

The invention relates to a conditioner for the quick desalination of coastal saline soil, which comprises organic fertilizer, gypsum powder and polyacrylamide, wherein the application amount of the organic fertilizer is 5 to 10 cubic meters / mu, the application amount of the gypsum powder is 5 to 10 cubic meters / mu, and the application amount of the polyacrylamide is 1 to 1.3 kilograms / mu. Aiming at the special demands of sowing and seedling keeping in a coastal saline and alkaline area, the conditioner for the quick desalination of the coastal saline soil is developed, has the advantages of simple operation during use, local production of raw materials, low cost and quick desalination, can also be used for regulating the moisture and nutrients of the soil, maintaining water and soil nutrients, improving the soil and microenvironment of seeds and improving crop yield, and is a novel nontoxic conditioner for soil liquid manure.

The invention discloses a method for fast improving newly-reclaimed saline wasteland. The method is achieved through the steps of land formation, irrigation salt leaching, alkali pressing by laying sand, forward crop planting and crop rotation planting. The method has the beneficial effects that according to the method for fast improving the newly-reclaimed saline wasteland, the yield of oil sunflowers, beet and other saline-alkaline tolerant forward crops can be improved by above 20%, and the stable yield of wheat after three years is 6,000 kg / hm<2>; meanwhile, desalination can be fast achieved through land formation, alkali pressing by laying the sand and irrigation salt leaching; efficient utilization can be achieved through forward crop planting and reasonable crop rotation, and the newly-reclaimed saline wasteland is improved when utilized.

The invention provides a method for quickly desalting, dealkalizing and ploughing a soda saline-alkali paddy field. The method comprises the following steps of: in the rice field after rice harvest in autumn, turning up the soil by using a big plough in autumn after base fertilizer is applied; sunning the upturned soil; rotating the soil in a dry mode in spring of the next year; ridging and soaking; leveling the field by using a thick rake until slurry is settled; and transplanting. In the method, spring soil turnup is replaced by autumn soil turnup; autumn soil turnup is combined with springsoil rotation; advantages of two tillage methods of rotary tillage and autumn soil turnup are utilized, advantages are absorbed and disadvantages are complemented, advantages are utilized and disadvantages are avoided, soil fertility is adjusted, and soil application and improvement are taken into consideration; and water resource is saved, saline and alkali are removed quickly, the soil structure is optimized, fragile ecological environment is improved, high yield, stable production and sustained development of rice in saline-alkali adverse situation are promoted. Rice is planted in the sodasaline-alkali land by the method, so the method is simple and easy in operation and convenient to popularize, labor and time are saved, production input cost is low, yield is increased obviously, repair of the fragile ecological environment is facilitated, and income of farmers is increased.

The invention relates to low-temperature environmental protection crude oil demulsifier which is formed by mixing initiating agent, catalytic agent, epoxy ethane and propylene epoxide. The technical scheme is as follows: under the action of the catalytic agent, the initiating agent triggers the copolymerization of the epoxy ethane and the propylene epoxide so as to obtain linear polyether with active hydroxyl groups on both ends, and finally the obtained polyether reacts with polyisocyanates in aromatic solvent, wherein the initiating agent is glycol or propanediol; the catalytic agent is themixture of alkaline earth compound and alkali metal hydroxide; and the weight ratio of the initiating agent, the catalytic agent, the epoxy ethane and the propylene epoxide is 10:1:150:500. The low-temperature environmental protection crude oil demulsifier of the invention is used for the low-temperature dehydration, the desalination, the visbreaking, the wax resistance, the corrosion resistance,and the like of crude oil, has high adaptability, can be suitable for the fast desalination and the dehydration of thickened oil, thin oil and mixed crude oil of various oil fields, and can also be suitable for the fast desalination and the dehydration of the mixed crude oil of an oil refinery.

The invention discloses a method for in-situ improvement of dredger fill into soil for planting, aiming at providing the method through which the investment in soil change is reduced and limited land resources are protected by utilizing the dredger fill which is used as a matrix after being subjected to fast desalinization and fertilizer application by directly utilizing a soil improving material without soil change. The method comprises the following steps of: laying stripe-like spraying layers in the dredger fill, wherein the laying thickness of the spraying layers is 20cm; digging a collecting gutter under each spraying layer, laying a blind pipe in each collecting gutter, winding polypropylene yarns outside each blind pipe, and performing desalinization through the spraying layers and the blind pipes; blending an improving material comprising organic matters and inorganic matters into the dredger fill, wherein the blending depth can ensure that the soil in root layers of plants is in contact with the improving material; and irrigating washing brine. According to the method disclosed by the invention, the soil change is avoided, the operation is simple, the improvement effect is good, and damages to the soil resources, engineering investment and construction procedure can be reduced. Furthermore, green coverage can be fast increased, and a living environment of residents can be improved so as to be conductive to construction of an eco-city.

The invention discloses a separation and purification method of an MBTI. The method comprises the following steps: 1, extraction; 2, neutralization; 3, heat treatment; 4, membrane treatment; and 5, adsorptive separation, and desorption. So the high purity MBTI is obtained. The invention also discloses an application of the MBTI, and the application is that the MBTI, which is added to surimi products treating seawater fish or freshwater fish as a main raw material and is uniformly mixed, is used for enhancing the elasticity of the surimi products. The separation and purification method of the invention has the advantages of simple technology and good separation effect, and the MBTI has a great improvement effect on the elasticity enhancement of the surimi products.

A high-rate hydrothermal cleanup (HCU) process and system is disclosed for the rapid hydrolysis of renewable oils and reduction of inorganic and organic contaminants, such as salts, minerals, metals, asphaltenes, polymers, and coke precursors in both renewable oils and petroleum fractions. The process and system is characterized by a very short residence time, high-temperature, high-pressure, turbulent flow, hydrothermal operation. The HCU and integrated vapor-liquid separation system and process results in high yields of oil product that contains significantly reduced concentrations of inorganic and organic contaminants. The process may be operated to produce a concentrated clean glycerin byproduct and short-chain and long-chain free fatty acid product streams. The integrated vapor-liquid separation system and process performs at near atmospheric pressure by taking advantage of the water employed in the cleanup process and the energy imparted by the HCU reactor and eliminates the need for vacuum distillation.

The invention relates to a leaching and desalting method of the top soil of alkaline land; the method includes the following steps: (1) the top soil to be treated with leaching and desalting is stripped from the alkaline land; (2) the stripped soil is transferred to a special work place for leaching and desalting; (3) the stripped soil is put into a piece of comprehensive leaching and desalting equipment in the work place for leaching and desalting; (4) water with low salinity is added into the comprehensive leaching and desalting equipment for being mixed with the soil; (5) the comprehensive leaching and desalting equipment carries out soaking desalination and pumping filtration salt draining to the soil; (6) the soil treated with leaching and desalting is transferred back to the original land; (7) saline water generated in the leaching and desalting process is drained. By adopting the method, the top soil of alkaline land is stripped from the original site, and then the salt in the top soil is quickly eliminated by leaching, thus the planting capability of alkaline soil can be recovered quickly.

The invention discloses a recycling treatment method for desalinized and desalted kitchen waste. Solid kitchen wastes are desalinized, decomposed and removed through optimally controlling an electrolysis condition, i.e., the kitchen wastes to be treated are preheated to 55-110 DEG C, an acid medium is added to adjust the pH value of the kitchen wastes, and salts in the kitchen wastes are electrolyzed to ensure that the pH value of swill is up to and kept within a special range, so that the salts in the solid kitchen wastes are successively removed and dissolved into the swill and are conveniently and rapidly ionized and converted into substances such as sodium hypochlorite, and furthermore, the desalinization and desalting effects are achieved. In addition, sodium chloride can be used for simultaneously oxidizing long bacteria, short bacteria and other imparities in the swill to form other harmless molecules, so that the finally obtained natural fertilizer can be recycled. Meanwhile, the treated swill can also be up to the national emission standard, the aims of turning the kitchen wastes into wealth and recycling the kitchen wastes are achieved completely, and the remarkable social and economic benefits are achieved.

The invention provides a double-layer composite underground drainage device for improving farmland soil of coastal mud flat reclamation areas by combining short-term rapid drainage desalination with long-term control accumulation of salt. The device comprises a short-term shallow straw gap underground drainage system salt leaching channel, a stream collecting and fixing water absorption subdrain and an open drain on the coastal mud flat saline-alkali soils, wherein the salt leaching channel is positioned above the stream collecting and fixing water absorption subdrain and is arranged with the stream collecting and fixing water absorption subdrain in parallel; the open drain is arranged at the water outlet end of the subdrain and the salt leaching channel; the water head difference is formed between the open drain and the coastal mud flat ground surface. The drainage method method comprises the steps of leaching the salt in the coastal mud flat soil by using the percolation generated by irrigation or rainfall, enabling the salt to enter into the shallow straw underground drainage system salt leaching channel and the stream collecting and fixing water absorption subdrain along the stream, discharging the salt in the soil along the water, and leading to the open drain. After the underground drainage system salt leaching channel formed by shallow straw gaps is deformed caused by pressure, the channel can still keep excellent drainage and salt elimination performance, so that the technical problems that the plastic corrugated subdrain is easy to deform and not suitable for shallow burying after being subjected with burying and operation agricultural implements dynamic load pressure can be solved.

The invention provides an economical seashore saline soil greening quick planting method. The method includes the following steps that (1) main water spray ditches with the width of 50 cm and the depth of 80 cm are dug in determined land used for greening in the transverse direction every 20 m; (2) a main water spray blind ditch is dug downwards in the center of the bottom of each main water spray ditch, wherein an upper opening of the main water spray blind ditch is 30 cm wide, a lower opening of the main water spray blind ditch is 20 cm wide, and the main water spray blind ditch is 30 cm deep; (3) the main water spray blind ditches are filled with niter, and natural soil is retuned into the main water spray ditches; (4) branch water spray ditches are dug intersecting with the dug main water spray ditches by 90 degrees every 2 m, an upper opening of each branch water spray ditch is 50 cm wide and each branch water spray ditch is 60 cm deep; (5) a branch water spray blind ditch is dug downwards in the bottom of each branch water spray ditch, wherein an upper opening of the branch water spray blind ditch is 20 cm wide, a lower opening of the branch water spray blind ditch is 15 cm wide and the branch water spray blind ditch is 20 cm deep; (6) the branch water spray blind ditches are filled with niter, and natural soil is retuned into the branch water spray ditches; (7) saline soil conditioners are laid on the surface layers of greenbelts, and the saline soil conditioners are uniformly mixed with soil below the surface layers. The method has the effects of achieving quick desalination, saving cost and improving the saline soil improvement effect.

The invention discloses a deionized water all-in-one treatment method and device for water treatment of a micro-polluted water source. The all-in-one treatment method is combined with a forward osmosis technology and a membrane capacitance deionization technology. The forward osmosis technology can effectively remove micro-polluted substances from water, and a membrane capacitance deionization can concentrate and recycle a draw solution, so that removal of pollutants from water can be realized, and the draw solution is recycled; meanwhile, the problems of high membrane pollution rate, high energy consumption and the like are also solved; a forward osmosis unit and a multi-stage membrane capacitance deionization unit are simultaneously arranged in the treatment device; and the treatment device is convenient to mount and easy to operate, realizes effective removal of the pollutants from the water and has the advantages of low energy consumption, low membrane pollution rate, simplicity for operation and the like.

The invention discloses a coastal heavy solonchak 5N rapid high efficiency desalting method, and belongs to the technical field of mudflat solonchak improvement. The method includes: tillage, soil sunning, soaking, water rotation, and salt discharging, and the five steps are cycled for many times, multiple water rotation tillage is a key of the technical system, and is an important key to achievement of rapid desalting. The advantages of the invention are that watering and drainage are easy to perform in a field, the operation flow is complete and is easy to implement, the electricity safety is high, the desalting efficiency is high, rapid high efficiency desalting of coastal heavy salt fields is facilitated, and a cultivation level of the coastal heavy salt field can be reached; and the coastal heavy solonchak 5N rapid high efficiency desalting method has economic value and social meaning to coastal mudflat soil resource development and utilization, grain production, environment protection, and salt-tolerant plant research.

The invention discloses a simple and fast desalting method of sandy heavy saline soil. The simple and fast desalting method includes leveling saline-alkali soil; arranging draining canals, covering straws, cleaning ditches and the like. The simple and fast desalting method is characterized in that the soil is covered with wheat straws or barley straws, and the natural concentrated rainfall feature in the coastal area is fully utilized, thus the coastal sandy saline soil is fast desalted. The simple and fast desalting method is easy and convenient to operate, low in cost and high in application value and can be widely applied to fast desalting of the sandy saline soil in the coastal beaches of Jiangsu province, and therefore large-scale crop cultivation is facilitated to improve utilization potential of the beaches.

The invention relates to the technical field of saline-alkali soil ecological treatment, in particular to a method for establishing reed vegetation on heavy soda saline-alkali soil. The method aims to solve the problem that in an existing heavy soda saline-alkali soil vegetation planting process, the alkalization degree is high, soil hardening is firm, and tillage is difficult, accordingly survival of plants is extremely difficult, and vegetation coverage cannot be formed. The method comprises the first step of pool ridge construction, the second step of reed provenance obtaining, the third step of plant hole drilling, the fourth step of reed stem section planting and the fifth step of growth period management. The method has the advantages that the purposes of improving the soil and restoring vegetation are achieved; field operation is convenient, the survival rate is high, and the reed coverage rate in the second year reaches 70%. The method is mainly used for establishing the reed vegetation on the heavy soda saline-alkali soil.

The invention discloses acid magnesium aluminum hydroxide as well as a preparation method and application thereof in improvement of coastal saline-alkali soil. An acid magnesium aluminum hydroxide isprepared by co-precipitating MgCl2 and AlCl3 at a molar ratio of 1:3 under the condition of dropping ammonia water diluted by 3 times. In the invention, from the aspect of microcosmic double electriclayers of the soil, the adsorption capacity of the soil for base cations is reduced by utilizing the overlapping of diffusion layers between negative charge saline-alkali soil colloid and prepared positive charge magnesium aluminum hydroxide colloid, so that the saline-alkali soil is desalted and improved. According to the acid magnesium aluminum hydroxide, the coastal saline-alkali soil can be remarkably improved, the soil aggregation is promoted, the salinity in the saline-alkali soil is promoted to be separated out, the pH value of the soil is decreased, and the saline-alkali soil is improved by modifying the soil on the premise of not introducing new pollutants. According to the material, the problem of salinization of the soil can be solved, and the salinization of the soil can be effectively prevented, therefore, the material is an environment-friendly material.

A low-energy-consumption, quick and recyclable lead paste desulfurization mother liquid desalinating process includes the steps of: 1) collecting the waste lead paste from detachment of waste and used lead acid batteries, and according to difference of sulfur content of the waste lead paste, adding water to the waste lead paste in a reaction kettle, in which strong convection can be formed, to prepare ore slurry being 50% in solid content; 2) adding Na2CO3 to the ore slurry with addition quantity of the Na2CO3 being 1.3-1.4 times as theoretical quantity, wherein the addition process is free of heating; 3) starting the reaction kettle to continuously stir the ore slurry for 30 min, and feeding the ore slurry into a device having strong collision, extrusion and friction effects to perform a reaction, wherein a PbCO3 layer coating the surface of PbSO4 during a desulfurization process is broken, so that the PbSO4 is fully contact with the Na2CO3 in the solution; and 4) after the reaction for 20 min, performing solid liquid separation to the reaction product to obtain desulfurization mother liquid and desulfurization lead paste; and 5) pumping the desulfurization mother liquid into a crystallizer, adding a certain amount of a crystallization accelerant, discharging the mother liquid after 30 min and performing solid liquid separation so as to removal by-product salt from the desulfurization mother liquid.

The invention discloses a method for recycling kitchen waste after salt removal, and relates to the technical field of garbage disposal engineering. The method specifically comprises the following steps: (1) collecting the kitchen waste, performing recycling, performing sorting, and separating an oil layer in the recycled kitchen waste; (2) crushing kitchen waste generated after separation to formfine slurry; (3) performing instantaneous sterilization on the crushed slurry at high temperature of 100-120 DEG C, and adding a pH regulator into the sterilized slurry to make a pH value reach and maintained at 3.5-4.5 or 9-10; (4) electrolyzing the adjusted slurry obtained in the step 3, and electrolyzing the slurry obtained in the step 2 to form a hypochlorite; and (5) after the salt content in the kitchen waste reaches a standard value, adding a pH regulator to adjust the pH value to 6-8, and stopping electrolysis. According to the method provided by the invention, the obtained natural fertilizer can be recycled, and treated swill can meet a national emission standard in China.

The invention discloses a method for building flower beds and planting flowers and plants in a heavy saline-alkali land in an arid region and relates to the technical fields of soil transformation methods and green lawn planting. The method for building flower beds and planting flowers and plants in the heavy saline-alkali land in the arid region comprises 18 steps and has various advantages of desalting rapidly, achieving long-acting and durable effect, saving water and cost, completely eliminating weeds, promoting growth of ornamental plants and the like.

The invention discloses a deionization integrated treatment method for desalinated water. The method comprises the following steps: raw water passes through a plurality of membrane filter modules sequentially, and primary filtered water is obtained; the primary filtered water passes through a plurality of capacitive deionization modules sequentially, and secondary filtered water is obtained; the secondary filtered water passes through a low-pressure reverse osmosis module, and purified water is prepared. According to a water treatment device based on the method, the raw mater is treated by the plurality of membrane filter modules, the plurality of capacitive deionization modules and the low-pressure reverse osmosis module, which are connected in seriessequentially, via a water pump, and the purified water is prepared. Microfiltration, ultrafiltration, multiple stages of membrane capacitive deionization and low-pressure reverse osmosis are combined for removing suspended solids, organic matter and salt in water respectively, the problems of high energy consumption, high membrane pollution rate and the like of a conventional reverse osmosis technology are solved, the treatment effect of saline water desalination is improved, the structure is simple, the operation is convenient, equipment maintenance cost is low, and the method and the device have high practicability and extensive applicability.

The invention relates to a method of removing inorganic salt from phenylalanine fermented liquid. The method includes: performing ultrafiltration to a phenylalanine fermented liquid through an ultrafiltration membrane, regulating pH of a phenylalanine ultrafiltered clear liquid, injecting the phenylalanine ultrafiltered clear liquid into a first electrodialysis device for desalting the liquid; when the electrical conductivity of the phenylalanine ultrafiltered clear liquid is 5000-6000 [mu]s / cm, injecting the clear liquid into a second electrodialysis device, and crystallizing the second batchof the phenylalanine electrodialyzed concentrated liquid; separating the crystal from the mother liquid and drying the crystal to prepare phenylalanine crystal. The method is simple in control and isfree of addition of chemical substances and generation of solid residues during treatment, wherein the generated waste liquid can be recycled for the production of fermentation, so that the method isfree of environmental pollution. The method is suitable for being promoted and applied.

The invention discloses a method for improving seriously saline-alkali land of an oasis area and planting a high-quality lawn, which relates to a soil improving method and the technical field of lawn planting. The method for improving seriously saline-alkali land of the oasis area and planting a high-quality lawn comprises 1 to 18 steps. The method disclosed by the invention has the advantages of fast desalination, no salt accumulation in the surface soil, soil fertility improvement, water conservation, high salt absorbing efficiency of plants, and the like.

A method of water seepage and salt drainage in salt and alkali shoal land comprises following steps: 1) land leveling, deep ditches which are 26 to 60 cm deep are dug with intervals of 0.4 to 8 meters; the deep ditches are one-way parallel ditches, or parallel ditches which are crossed in length and breadth with different density vertically and horizontally, a layer of sand which is 3 to 37 cm thick is laid at the bottom of the deep ditches to form underground alkali discharge sand ditches; 2) underground salt discharge pipes laying; 3) underground irrigation pipes laying; 4) deep scarification and knot breaking; 5) fresh water flooding irrigation; 6) salt water enhanced drainage: while fresh water flooding irrigation is being carried out, one ends of the underground salt discharge pipes are sealed with sealing plugs and the other ends are connected with water pumps to perform enhanced drainage on salt water leached to the underground salt discharge pipes; the leached salt water is drained to salt discharge ditches; 7) continuous irrigation and drainage: the fresh water flooding irrigation and the salt water enhanced drainage are repeated carrying out to quickly leach the salinity in the soil; when the salinity in the soil decreases to an expected target, irrigation and drainage are stopped.

The invention relates to the technical field of land improvement, in particular to a quick saline-alkali land desalting system method by means of concealed-tube irrigation and drainage. The method includes adopting a series of technical measures including ditching and dike enclosing, salt-drainage concealed-tube laying, irrigation concealed-tube laying, deep scarification and cracking, fresh-water basin irrigation, salt-water forced drainage, continuous irrigation and drainage, annual salt drainage and the like in heavy saline-alkali land near seashores to realize quick saline-alkali land desalting. The quick saline-alkali land desalting system method has the advantages that underground water level can be lowered through ditching and field raising, salt in the land can be washed through basin irrigation, the saline-alkali land can be desalted quickly through salt-water forced drainage, and annual salt drainage is realized and salt accumulation in the land is avoided by keeping lower water levels of salt drainage ditches, so that one-step quick desalting is realized, desalting effect is maintained for a long time, and improvement of the saline-alkali land is realized quickly.

The invention relates to a salt drainage method for vertical seepage pipes in coastal saline soil. The method comprises the following steps: 1) First, leveling and modeling the land on a determined green land; A temporary open ditch with a width of 50-60cm and a depth of 90-100cm; 3) Installation of the vertical seepage pipe: put the vertical seepage pipe prepared in advance into the bottom of the open ditch, adjacent to the axis of the vertical seepage pipe The line spacing is 5m, and a drainage pipe is installed at the bottom of the vertical seepage pipe, and the drainage pipe is directly connected with the municipal well or the drainage well; 4), the original soil of the open ditch is backfilled in the ditch; Sub-leveling and shaping, and spreading 10cm thick original soil evenly mixed with biological amendments above the soil surface; then carry out regular watering. The method of the invention can achieve the purpose of rapid desalination.

The present invention provides an ecological restoration method for seawater inwelling farmlands in tropical areas. The ecological restoration method for seawater inwelling farmlands in tropical areascomprises the following steps: soil ridging of seawater inwelling saline-alkali soil is conducted, a full-film double ridge and furrow model is used, ridged ridges are of a trapezoidal structure, andthe ridges are vertical to a coastline direction; and salt-tolerant plants are planted on the ridges and acanthus ilicifolius is planted in ridges and furrows. Salt on the ridges are leached into theridges and furrows through natural precipitation and irrigation. The acanthus ilicifolius planted in the ridges and furrows uses salt glands to discharge the excess salt from body, and the salt-tolerant crops and acanthus ilicifolius are harvested to effectively remove the salt, an effect of reducing the salt in the soil is achieved through an on-the-ridge and below-the-ridge double function, atthe same time, growth and metabolism activities, root interpenetration and humification of dry branches, fallen leaves and dead root stubbles of the acanthus ilicifolius and various salt-tolerant plants improve physicochemical property of the soil. The ecological restoration method is high in comprehensive salt removal efficiency, increases soil fertility, is high in efficiency of reducing soil pH, can restore the soil better and faster, and also has higher economic and ecological benefits.

The invention provides a three-in-one cultivation method with desalination and planting integration for heavily saline soil in coastal beaches; with 20%. heavily saline soil serving as an example, salt in the saline soil is soaked out through fresh water by adopting a three-drying one-draining method, the water in which the salt of the saline soil is dissolved is discharged, and the heavily salinesoil is subjected to salt washing 5 times circularly so that the salt content of the heavily saline soil is decreased from 20%. to 6-7%.; the desalted soil is further desalted by adopting a water-soil rotary tillage method three times circularly so that the salt content of the soil is decreased from 6-7%. rapidly to about 3%.; the desalted soil is further desalted by adopting a sunning-soaking rotation method two times circularly, the desalting effect of upland field planting can be rapidly achieved, and the salt content of the soil layer with the depth of 0-20 cm is further decreased to 2%.and below; the method of the invention has high desalting speed and good desalting effect, allows saline-alkaline soil to be transformed to a degree suitable for planting common rice and wheat varieties within one year, and is suitable for desalting and planting in a beach heavily saline soil area.

The invention provides a method for quickly desalting, dealkalizing and ploughing a soda saline-alkali paddy field. The method comprises the following steps of: in the rice field after rice harvest in autumn, turning up the soil by using a big plough in autumn after base fertilizer is applied; sunning the upturned soil; rotating the soil in a dry mode in spring of the next year; ridging and soaking; leveling the field by using a thick rake until slurry is settled; and transplanting. In the method, spring soil turnup is replaced by autumn soil turnup; autumn soil turnup is combined with springsoil rotation; advantages of two tillage methods of rotary tillage and autumn soil turnup are utilized, advantages are absorbed and disadvantages are complemented, advantages are utilized and disadvantages are avoided, soil fertility is adjusted, and soil application and improvement are taken into consideration; and water resource is saved, saline and alkali are removed quickly, the soil structure is optimized, fragile ecological environment is improved, high yield, stable production and sustained development of rice in saline-alkali adverse situation are promoted. Rice is planted in the sodasaline-alkali land by the method, so the method is simple and easy in operation and convenient to popularize, labor and time are saved, production input cost is low, yield is increased obviously, repair of the fragile ecological environment is facilitated, and income of farmers is increased.

The invention provides a three-in-one deseeding integrated cultivation method for coastal heavy saline soil. Taking 20‰ heavy saline soil as an example, the "three dry and one row method" is used to soak the salt in the saline soil with fresh water, and then discharge the dissolved saline soil. Wash the heavy saline soil with medium saline water, and cycle it 5 times, so that the salt content of the heavy saline soil will drop from 20‰ to 6‑7‰; use the "water and soil rotary tillage method" to further desalinate the above desalinated soil , cycled 3 times, so that the salt content of the soil quickly dropped from 6-7‰ to about 3‰; the above-mentioned desalinated soil was further desalinated by using the "sun soaking and spinning method", and the cycle was repeated 2 times, which can quickly reach the level of dry field planting. The desalination effect further reduces the salt content of the soil layer with a depth of 0-20cm to below 2‰. This method has a fast desalination speed and a good desalination effect. Within one year, the saline-alkali land can be transformed to the extent that common rice and wheat varieties can be grown , suitable for desalination and planting in tidal flat heavy saline soil areas.