30results about How to "Extend continuous stable operation time" patented technology

The invention provides a zero release device of high-salt high-ammonia-nitrogen waste water. The zero release device is mainly used for solving problems of conventional devices that discharge standards are not reached, and water resource recovery rate is low in high-salt high-ammonia-nitrogen waste water treatment. The zero release device is a membrane coupling device, and mainly comprises a membrane absorption unit, a nanofiltration unit, a forward osmosis unit, and a cooling crystallization unit; the membrane absorption unit is connected with the nanofiltration unit, the nanofiltration unit is connected with the forward osmosis unit, the forward osmosis unit is connected with the membrane absorption unit and the cooling crystallization unit, and a plurality of circulation loops are formed via connection of the units. The zero release device is easy for operation, and is easy for realization. The zero release device can be used for solving processing problems of high-salt high-ammonia-nitrogen waste water effectively, water recovery rate is high, and quality of obtained water is high. The zero release device is used for circulating condensation of high-salt high-ammonia-nitrogen waste water, almost no concentrated water is discharged, and recovery of water resource of high-salt high-ammonia-nitrogen waste water is realized as far as possible.

The invention belongs to the technical field of extraction and purification processing equipment in the field of uranium purification and production, and particularly relates to a method for fixing sieve plates of a pulse sieve plate column. According to the method for fixing the sieve plates of the pulse sieve plate columns, transverse fixing of the sieve plates is achieved through a central rod, pull rods and the like so that a gap between a column body and a plate string can be reduced, and mass transfer is sufficiently achieved. Radial fixing of the sieve plates is achieved through the pull rods and pull rod pipe spacers so that it can be guaranteed that the sieve plates are not prone to deformation, and mixed mass transfer is stable. Longitudinal fixing of the sieve plates is achieved through central pipe spacers, so that it is guaranteed that the distances between the sieve plates are equal, and mixed mass transfer is stable.

The invention relates to the field of industrial waste water treatment and particularly relates to a treatment and recycle method of a phosphoric acid waste liquid. In the method, the phosphoric acid waste liquid is successively subjected to micro-filtration, anion exchange, cation exchange and two-stage membrane distillation for recycling the phosphoric acid therefrom. The treatment and recycle method of the phosphoric acid waste liquid, in which the processes comprising the micro-filtration, the anion exchange, the cation exchange, primary membrane distillation and secondary membrane distillation are employed, can be used for treating the phosphoric acid waste liquids generated in production processes of various industries to recycle the phosphoric acid therefrom. The method not only saves energy but also protects natural ecological environment.

This application discloses a multi-stage reaction and separation system for hydrometallurgy based on carbon dioxide, including: a raw material pre-washing device, industrial waste or ore raw materials or tailings, reagents and water are continuously put into the raw material pre-washing device according to a certain ratio and fully mixed The reaction device, the slurry is continuously injected into the reaction device, the carbon dioxide is continuously injected into the reaction device, and the reacted slurry is continuously discharged; the multi-stage solid-liquid separation device performs multi-stage solid-liquid separation of the slurry, and the solid-liquid The separated unreacted solid particles are circulated to the expected pre-washing device; the third product preparation device, which contains the target calcium ions and magnesium ions in the clear liquid to prepare calcium and magnesium products; the recovery water circulation device, the recovered water is recycled to the system. The application can realize continuous reaction, realize the maximization of processing capacity, and also provide possibility for multi-stage circulation reaction, and also reduce the loss of carbon dioxide in the discharge process of batch reaction.

The invention discloses a novel solar energy reduced-pressure multiple-effect membrane distillation apparatus, and aims to utilize solar energy to replace conventional electrical heating as a heat source and heat a raw material fluid to reach a goal of saving energy and reducing consumption. A set of simple Venturi system is used to replace a vacuum pump which is used in the reduced-pressure multiple-effect membrane distillation, so that energy consumption in a membrane distillation operation process is further reduced, and 100% collection of produced water is realized, and the membrane flux is improved. The application of multiple-effect membrane components realizes the effective utilization of phase transformation heat of a water vapor, and the heat-utilization rate is improved. The novel Venturi-solar energy reduced-pressure multiple-effect membrane distillation system is adopted, so that the total energy consumption and the operation cost in the membrane distillation process are greatly reduced.

The invention relates to a high-temperature high-salinity wastewater zero-discharging method. Firstly, a high-temperature-resisting nanofiltration membrane is adopted to remove multivalent ions and a little amount of organic matter in wastewater, then a membrane distillation technology is adopted to conduct deep concentration treatment on the wastewater, membrane-distillation concentrated water is subjected to evaporative crystallization treatment to enable salt in the membrane-distillation concentrated water to crystallize out, and centralized drying disposal is performed. Salt is added into the nanofiltration concentrated water produced in the treatment process to perform precipitation treatment so as to obtain calcium residues, centralized drying disposal is performed, supernate obtained after precipitation is subjected to activated carbon adsorption, and producing water obtained after activated carbon adsorption and nanofiltration feed water are mixed and fed into a nanofiltration unit for circular treatment. Membrane-distillation producing water and evaporative-crystallization producing water can be both reused for a production process. By means of the high-temperature high-salinity wastewater zero-discharging method, residual heat of the wastewater itself is effectively utilized while wastewater zero discharging is achieved, the energy consumption of the whole technological process is reduced, and efficient utilization of waste water resources and energy is achieved. The high-temperature high-salinity wastewater zero-discharging method has remarkable social benefit and environmental benefit.

The invention relates to the field of industrial wastewater treatment, in particular to a high-salinity high-hardness wastewater zero-discharging method. According to the method, a 'microfiltration and hardness removal + efficient reverse osmosis + membrane distillation + evaporative crystallization' method is adopted to treat high-salinity high-hardness wastewater. Firstly, a microfiltration and hardness removal technology is adopted to remove hardness of the high-salinity high-hardness wastewater, then an efficient reverse osmosis technology is adopted to further concentrate the wastewater without hardness so as to obtain efficient reverse osmosis producing water and efficient reverse osmosis concentrated water, deep concentration is conducted on the efficient reverse osmosis concentrated water through membrane distillation to obtain membrane-distillation producing water and membrane-distillation concentrated water, evaporative crystallization treatment is further conducted on the membrane-distillation concentrated water to enable salt solids in the concentrated water to crystallize out, and centralized drying disposal is performed. The efficient reverse osmosis producing water, the membrane-distillation producing water and evaporative-crystallization producing water produced in the treating process can be reused for a production process, water resources are recycled to the most degree while the problem of wastewater discharging is solved, and zero discharging of high-salinity high-hardness wastewater is basically achieved.

The invention discloses a high salinity ammonia nitrogen wastewater treatment method. The method adopts an acid adjustment + membrane distillation + forward osmosis process flow. The method is characterized in that acidity adjustment pretreatment of high salinity ammonia nitrogen wastewater is carried out according to the characteristics of wastewater and the characteristic of most ammonia nitrogen existing in the ammonia nitrogen wastewater with a low pH value as NH<+>, a membrane distillation technology is adopted to concentrate the acid adjusted high salinity ammonia nitrogen wastewater, high salinity membrane distilled concentrated water is used as a driving liquid of forward osmosis and is diluted through the continuous concentration of raw water at a forward osmosis inlet liquid side, and when the membrane distilled concentrated water is diluted to a specific concentration, the diluted concentrated water returns to a membrane distillation unit and is continuously concentrated. The process flow is cycled, and the advanced concentration treatment of the high salinity ammonia nitrogen wastewater is carried out to obtain a large amount of pure water and solve a problem that the membrane distilled concentrated water generated in the high salinity ammonia nitrogen wastewater treatment is difficult to treat, so the wastewater recovery rate is maximally improved, and the method has important environmental benefits.

The invention discloses a method used for processing high-salt high-ammonia-nitrogen waste water via membrane coupling. The method comprises steps of membrane absorption, reverse osmosis, and forward osmosis coupling. According to the method, an acid solution is taken as an absorption liquid, ammonia nitrogen in waste water is changed into ammonium salts via membrane absorption; obtained ammonium salt solution is concentrated further via reverse osmosis; the concentrated ammonium salt solution is taken as a driving liquid of forward osmosis, a high-salt waste water obtained after ammonia nitrogen removing via membrane absorption is taken as a feed liquid of forward osmosis, and forward osmosis concentration is carried out; the driving liquid ammonium salt solution is diluted, and a part of the ammonium salt solution is recycled to a reverse osmosis unit for recycling concentration. The method is capable of solving processing problems of high-salt high-ammonia-nitrogen waste water, water recovery yield is high, and quality of obtained water is excellent. The method is used for recycling concentration of high-salt high-ammonia-nitrogen waste water, concentrated water discharge amount is extremely low, and recovery of high-salt high-ammonia-nitrogen waste water is realized as far as possible.

The invention discloses a high salinity and high ammonia nitrogen wastewater treatment method. The method adopts a membrane absorption + nanofiltration + forward osmosis process flow. The method comprises the following steps: converting ammonia nitrogen in wastewater by adopting membrane absorption with a sulfuric acid solution as an absorption liquid to form ammonium sulfate; concentrating the ammonium sulfate solution through adopting nanofiltration; carrying out forward osmosis concentration treatment with the concentrated ammonium sulfate solution as a forward osmosis driving liquid and the high salinity wastewater with ammonia nitrogen removed through the membrane absorption as a forward osmosis inlet liquid; and diluting the ammonium sulfate solution as the driving liquid, and returning parts of the diluted ammonium sulfate solution to a nanofiltration unit for cycle concentration treatment. The method effectively solves the treatment problem of the high salinity and high ammonia nitrogen wastewater, allows the water recovery rate to be high, and allows the quality of produced water to be good. The method is adopted to carry out cycle concentration treatment of the high salinity and high ammonia nitrogen wastewater, so the discharge amount of concentrated water is extremely small, and the water resource in the high salinity and high ammonia nitrogen wastewater is maximally recovered.

The invention discloses a high-salt and high-organic-matter wastewater resource utilization and zero-discharge treatment system, comprising a regulating tank, an integrated aerobic granular sludge membrane bioreactor, a membrane distillation unit and an evaporation crystallization unit. The regulating tank stabilizes the water quality and quantity and precipitates part of the suspended matter, the integrated aerobic granular sludge membrane bioreactor removes most of the suspended matter and organic matter in the wastewater, and the membrane distillation unit removes ions and some remaining organic matter in the waste water, evaporates and crystallizes The unit treats membrane distillation concentrated water, evaporates and recovers water resources, crystallizes and recovers salt solids in membrane distillation concentrated water, and finally realizes the purpose of high-salt and high-organic wastewater water resources and salt resources recycling and zero discharge of wastewater. The invention can effectively solve the problem of resource utilization and zero discharge of high-salt and high-organic waste water, recycle water resources and salt resources to the greatest extent, and simultaneously realize zero discharge in the production process of high-salt and high-organic matter, and has important environmental benefits.