18 results about "Zero liquid discharge" patented technology

The invention discloses an automatic treatment device and method for metal workpiece surface polishing and application. According to the automatic environment-friendly electrochemical polishing device, the workpieces are automatically transferred through the automatic conveying device, automatic connection of all the procedures is achieved, and the automatic environment-friendly electrochemical polishing process of the metal workpieces such as the pure magnesium workpieces is achieved; and compared with the prior art, only water is used as a cleaning medium in the whole process, and toxic and harmful chemical agents are not needed. The environmental pollution risk is greatly reduced, and the environmental protection requirement is met. The environment-friendly polishing solution is adopted for electrochemical polishing, core components of the polishing solution are biodegradable non-toxic reagents such as ethyl alcohol and glycerinum, waste liquid treatment is simple, zero liquid discharge can be achieved, and the difficulty and cost of waste water treatment are remarkably reduced. According to the invention, the process flow is simplified, the consumption of chemicals and pollution emission are reduced, and the process efficiency is improved. According to the invention, whole-process monitoring and automatic operation from pretreatment to post-treatment are realized, the production efficiency and consistency are improved, and the method is suitable for industrial large-scale application.

The present invention relates to a method for recovering valuable materials from waste. The method for recovering valuable materials from waste comprises the steps of: (a) pulverizing waste, which is generated from an evaporator or a crystallizer among equipment of a zero liquid discharge process for desulfurization wastewater, and then injecting same into a dissolution tank so as to dissolve same in a solvent and separating same into a gypsum (CaSO4) precipitate and a supernatant from which the gypsum has been removed; (b) dissolving, in a desulfurization tank, barium chloride (BaCl2) in the supernatant from which the gypsum has been removed, and separating same into a barium sulfate (BaSO4) precipitate and a supernatant from which the barium sulfate has been removed; (c) dissolving, in a hydroxide tank, sodium hydroxide (NaOH) in the supernatant from which the barium sulfate has been removed, and separating same into a magnesium hydroxide (Mg(OH)2 precipitate and a supernatant from which the magnesium hydroxide has been removed; and (d) injecting, into a salt pond, the supernatant from which the magnesium hydroxide has been removed, so as to recover sodium chloride (NaOH).

The invention discloses a tank type fermentation process capable of realizing collaborative emission reduction of NH3, N2O and CH4. The tank type fermentation process comprises the following steps: S1, pretreating raw materials; s2, material introduction; s3, supplementing materials; and S4, continuous fermentation. The process has the advantages of obvious environmental benefit, realization of collaborative emission reduction of greenhouse gas and odor, final reduction of the compost load, high resource utilization efficiency, realization of closed-loop circulation of water and fertilizer, reuse of nutrient-rich leachate as a nitrogen fixation carrier, realization of zero liquid discharge and nutrient in-situ recovery, increase of the total nutrient content of a compost product, and realization of environmental protection and environmental protection. The nitrogen loss is greatly reduced, and beneficial components such as zeolite and pyroligneous liquor are added, so that the content of organic matters and nutrients of the finished compost is high, the water and fertilizer retention capacity is high, essential elements for promoting plant growth are contained, and the commodity value is remarkably improved.

The invention discloses an adipic acid crystallizer vacuum system and method capable of realizing zero liquid discharge of nitrogen-containing wastewater, which adopts a multi-stage Roots vacuum unit to realize pressure control on the adipic acid crystallizer vacuum system and a nitric acid concentration tower through a front buffer tank of the multi-stage Roots vacuum unit. Most condensable gas of the nitrite-containing steam generated by the adipic acid crystallizer is condensed and recovered to a condensate tank by using a gas condenser; uncondensed nitrogen-containing gas and a gas phase of the nitric acid concentration tower enter a buffer tank through pressure control, then are extruded by a multi-stage vacuum unit and are subjected to deep condensation treatment, condensed liquid enters a liquid storage tank through potential difference, and liquid in the liquid storage tank is sent to the nitric acid concentration tower through liquid level control to serve as reflux absorption liquid to absorb nitrite gas volatilized by the concentration tower; the adipic acid crystallizer vacuum system technology replaces a traditional steam injection pressurization vacuum system technology, consumption of medium-pressure steam and circulating water is reduced, zero liquid discharge of nitrogen-containing wastewater is achieved, and the adipic acid crystallizer vacuum system technology has remarkable environmental protection benefits and economic benefits.

Systems and methods including a pretreatment component for pretreating a produced water obtained from a subterranean formation operation to remove at least a portion of dispersed hydrocarbons and hydrogen sulfide therein, thereby producing a high salinity produced water; a desalination component for desalinating of the high salinity produced water to remove at least one or more salts therein, thereby producing a desalinated water and a saturated saline water; and a mineral recovery component for treating the saturated saline water to recover mineral salts therein, thereby producing the recovered mineral salts.

The application discloses a kind of based on mountain top geographical advantage sewage zero discharge spray evaporation method, belong to sewage advanced treatment and ultimate disposal technical field.The system will be wholely set in mountain top, ridge or other altitude significantly higher than the geographical position of pre-treatment unit and sensitive area.Spray evaporation field system includes with low-position clear water source connection high-pressure water supply system, atomizing nozzle array arranged in mountain top and intelligent control system.The method makes full use of the natural advantages of mountain top perennial wind, atmospheric diffusion condition is good, pre-treatment standard clear water is sprayed to high altitude by high-pressure atomization, realizes quick evaporation and zero liquid discharge.The core invention point is: by geographical high-position arrangement, natural ventilation evaporation efficiency is greatly strengthened, and mechanical ventilation energy consumption can be basically or completely saved;Utilize topographic relief to form natural environmental isolation zone, minimize the visual and odor impact of spray process on surrounding environment;And can realize intensive layout with the same built in mountain top biological treatment unit (such as three-dimensional natural ventilation biological membrane array tower) and potential energy sharing, build complete low-energy consumption mountainous area sewage zero discharge treatment system.

This invention provides a low-temperature concentrated brine flash crystallization device and method with self-generated steam foaming enhancement, belonging to the technical field of zero liquid discharge of high-salt wastewater and concentrated brine evaporation crystallization. It includes a concentrated brine storage tank, a pre-filter, a feed pump, a waste heat exchanger, a pressure stabilizing buffer tank, a foaming device, a steam return pipe, a foaming regulating valve, a check valve, a mixer, a large-diameter flash nozzle, a low-pressure flash crystallization chamber, a demister, a condenser, a pressure regulating device, a distilled water collection tank, a brine slurry outlet, a brine separator, a salt crystal collector, a mother liquor circulation pump, and a mother liquor return pipe. This invention solves the problems of insufficient nucleation during low-superheat flash evaporation, inadequate atomization of large-diameter nozzles, easy clogging of small-diameter nozzles, high energy consumption at the end of concentrated brine crystallization, and insufficient stability of continuous system operation in existing technologies.

The application provides a kind of dispersed black-polyester fiber solar evaporation material and its preparation method and application.The polyester fiber cluster body and dispersed black are used as raw materials to prepare the solar evaporation material.The polyester fiber cluster body has multiple vertical pores, which can quickly transport water from the bottom to the evaporation surface through capillary action.The polyester fiber has hydrophobic characteristics, which can effectively prevent salt deposition on its surface, achieving high salt tolerance.The polyester fiber cluster body dyed by commercial dispersed black improves the light absorption capacity of the three-dimensional solar evaporator and the light-heat conversion capacity of the material.The solar evaporation material of the application makes the salt crystallize at the bottom by evaporating the moisture in the distillation tank, obtaining solid salt, achieving zero liquid discharge, and using industrial dyeing process to make the evaporation material, which is efficient, low in cost, can be mass-produced, and is a promising solution to solve the global freshwater shortage problem.

This invention provides new ways of distributing dilute and concentrate waters to the spaces between cation and anion ion exchange membranes in an electrodialysis system. An external attached manifold is used to distribute-and-retrieve concentrate water to-and-from each concentrate water space, which by the design of components can mitigate the power lost in the concentrate water distribution system. Furthermore, the dilute water is externally and simultaneously distributed to the dilute water spaces, that are between the adjacent anion and cation ion exchange membranes in the electrodialysis stack of components, and the thickness of the dilute water spaces can be kept to be as low as on-the-order-of one-tenth-inch while maintaining good dilute water flow rates. Finally, this invention provides a means of obtaining Zero Liquid Discharge ZLD desalination operation.

The present application relates to the technical field of wastewater treatment, and particularly relates to a salt-resistant evaporation device for zero liquid discharge of salt-containing wastewater and a salt-containing wastewater treatment method. The salt-resistant evaporation device can be used for evaporating salt water. In the operation process of the salt-resistant evaporation device, the salt deposition wall utilizes the local enhanced evaporation effect of the outer surface edge of the salt deposition wall to guide the salt to selectively directionally crystallize, grow on the outer surface of the salt deposition wall and fall off by gravity. A temperature gradient is formed between the photo-thermal evaporation body and the salt deposition wall, and the temperature gradient drives the vapor to condense on the inner surface of the salt deposition wall, so as to inhibit the deposition of the salt on the inner surface of the salt deposition wall and the surface of the photo-thermal evaporation body.

The proposed techniques relate to removing heat stable amine salts (HSAS) from a contaminated aqueous amine absorption solution containing amine in salt form generated during an amine- based acid gas recovery operation, while reducing or avoiding discharging any liquid waste. At least a portion of the HSAS is removed from the contaminated aqueous amine absorption solution in an amine reclamation unit to produce a waste stream containing dissolved salts and / or acids, and a regenerated amine absorption solution containing a reduced amount of the heat stable amine salts. The waste stream is further treated by oxidizing the waste stream into an oxidized product stream comprising CO2, water, and nitrogen. Optionally, the concentration in dissolved salts and / or acids of the waste stream can be increased prior to oxidation. The oxidation can advantageously be operated in a combustion unit that produces a flue gas directed to acid gas recovery as part of an integrated process.

The present application belongs to the technical field of oil and gas field waste treatment, and discloses a prying type shale gas exploitation high-salt flow-back fluid on-site treatment device and method, which comprises, in sequence along the flow direction of the flow-back fluid, an oxidation unit, a flotation unit, a chemical precipitation unit, a coagulation and precipitation unit, a vacuum evaporation unit and a crystallization unit, which are connected in series and communicated through connecting pipes, the oxidation unit is provided with a liquid inlet pipe for introducing the flow-back fluid, and the crystallization unit is provided with a liquid outlet pipe; the oxidation unit, the flotation unit, the chemical precipitation unit, the coagulation and precipitation unit, the vacuum evaporation unit and the crystallization unit are integrated in a container body to form a prying type structure which can be moved as a whole; the process combination of "oxidation-flotation-chemical precipitation-coagulation and precipitation-vacuum and pressure reduction evaporation concentration-crystallization salt treatment" is used to replace the traditional membrane concentration, the membrane pollution problem is avoided, the prying type structure is movable, zero liquid discharge of the flow-back fluid is realized, and the crystallization salt is recycled.

The invention of the current application is directed to a water purification system, A water retentate treatment module, and a water treatment method. The water retentate treatment module includes an electrolytic treatment unit and a dissolved solids recovery unit. A water retentate stream is received in a electrolytic treatment unit which performs at least one process selected from the group consisting of electrochemical oxidation, hardness removal and reduction, and / or the water retentate stream is received in a dissolved solids removal unit wherein at least one of hydrogen, ammonia, or hydrogen peroxide are recovered.

The invention discloses a method for separating and recycling high-salinity wastewater based on a nano ceramic membrane filter aid material, which comprises the following steps: pretreating raw high-salinity wastewater to remove suspended solids, hardness ions and part of organic matters; adding a nano ceramic membrane filter aid material subjected to surface hydrophilic modification into the pretreatment liquid to form a dynamic filter aid layer; filtering and separating through a ceramic ultrafiltration membrane assembly to obtain a permeate and a concentrated solution; the permeate liquid is used as reuse water for direct resource utilization, the concentrated liquid is further concentrated and subjected to evaporative crystallization treatment, inorganic salt crystallization products are recycled, and resource utilization is achieved. According to the invention, the dynamic layer of the nano ceramic filter aid material is utilized to enhance the anti-pollution capability and improve the membrane flux stability and the system recovery rate; and hydrophilic modification and regular cleaning are combined to realize long-term stability of membrane performance. The method is suitable for high-salinity wastewater treatment, the effluent quality meets the industrial recycling requirement, the process is efficient and resistant to corrosion, and near-zero liquid discharge of high-salinity wastewater and salt resource recovery are achieved.

This invention discloses a hybrid system for supercritical solar desalination with zero emissions and steam turbine power generation. The system comprises a solar concentrator connected to a heat exchanger; the brine inlet of the heat exchanger connected to the brine outlet of condenser one, and the brine outlet connected to the inlet of a steam-water separator; the high-temperature steam outlet of the steam-water separator connected to the high-temperature steam inlet of the steam turbine generator set; the low-temperature steam outlet of the steam turbine generator set connected to the low-temperature steam inlet of condenser two; the high-concentration brine outlet of the steam-water separator connected to the high-concentration brine inlet of a flash evaporator; the low-temperature steam outlet of the flash evaporator connected to the low-temperature steam inlet of condenser one; the outlet of drive pump one connected to the cooling water inlet of condenser two; and the cooling water outlet of condenser two connected to the brine inlet of condenser one. This hybrid system is characterized by high efficiency, environmental friendliness, sustainability, and zero liquid discharge.

The invention of the current application is directed to a water purification system, A water retentate treatment module, and a water treatment method. The water retentate treatment module includes an electrolytic treatment unit and a dissolved solids recovery unit. A water retentate stream is received in a electrolytic treatment unit which performs at least one process selected from the group consisting of electrochemical oxidation, hardness removal and reduction, and / or the water retentate stream is received in a dissolved solids removal unit wherein at least one of hydrogen, ammonia, or hydrogen peroxide are recovered.

The application discloses a zero-discharge cooling water system with a water supplement device, which comprises a cooling water system, a filter for performing preliminary filtration on sewage discharged from the cooling water system, a sewage sedimentation tank for storing the filtered sewage, a clean water tank for storing generated clean water, an ultrafiltration membrane assembly for filtering the clean water delivered by the clean water tank, an ultrafiltration water tank for storing generated ultrafiltration water, a nanofiltration membrane assembly for filtering the ultrafiltration water delivered by the ultrafiltration water tank, and a pure water tank for storing generated pure water, wherein the generated pure water is delivered to the cooling water system. The generated pure water is supplemented into the cooling water system again after being treated from the sewage discharged from the cooling water system, so that the zero-discharge effect is realized. The sewage is treated by the ultrafiltration membrane assembly and the nanofiltration membrane assembly, so that calcium and magnesium ions, metal ions and chlorine ions are effectively removed from the generated pure water, and then the pure water is applied to the cooling water system again, so that the problems of scaling and plugging and corrosion of the cooling water system are effectively reduced.