50results about How to "High water recovery" patented technology

The present invention provides a method and system for efficiently producing hydrogen that can be supplied to a fuel cell. The method and system of the present invention produces hydrogen in a reforming reactor using a hydrocarbon stream and water vapor stream as reactants. The hydrogen produced is purified in a hydrogen separating membrane to form a retentate stream and purified hydrogen stream. The purified hydrogen can then be fed to a fuel cell where electrical energy is produced and a fuel cell exhaust stream containing water vapor and oxygen depleted air is emitted. In one embodiment of the present invention, a means and method is provided for recycling a portion of the retentate stream to the reforming reactor for increased hydrogen yields. In another embodiment, a combustor is provided for combusting a second portion of the retentate stream to provide heat to the reforming reaction or other reactants. In a preferred embodiment, the combustion is carried out in the presence of at least a portion of the oxygen depleted air stream from the fuel cell. Thus, the system and method of the present invention advantageously uses products generated from the system to enhance the overall efficiency of the system.

The invention relates to the field of industrial wastewater treatment, in particular to a high-concentration wastewater zero-discharging method. Accoridng to the method, a 'nanofiltration + efficient reverse osmosis + membrane distillation + evaporative crystallization' method is adopted to treat high-concentration wastewater. Firstly, nanofiltration is adopted to remove hardness, multivalent ions and parts of organic matter in the high-concentration wastewater so as to obtain nanofiltration producing water and nanofiltration concentrated water, then an efficient reverse osmosis technology is adopted to conduct deep concentration treatment on the nanofiltration producing water, deep concentration treatment is conducted on the obtained efficient reverse osmosis concentrated water through membrane distillation to obtain membrane-distillation concentrated water, further evaporative crystallization treatment is performed to enable salt solids in the membrane-distillation concentrated water to crystallize out, and centralized drying disposal is performed, wherein salt is added into the nanofiltration concentrated water to perform precipitation treatment so as to obtain calcium residues, supernate obtained after precipitation is subjected to activated carbon adsorption and then is mixed with the high-concentration wastewater, and the mixed liquid is fed into a nanofiltration unit for circular treatment. By means of the high-concentration wastewater zero-discharging method, water resources are recycled to the most degree while the problem of high-concentration wastewater discharging is solved, and zero discharging of high-concentration wastewater is basically achieved.

The invention relates to the field of industrial wastewater treatment, and specifically relates to a high-salinity high-organic-matter content wastewater zero discharge method. According to the invention, the high-salinity high-organic-matter content wastewater is treated with submerged membrane bioreactor treatment, nano-filtration, high-efficiency reverse osmosis, membrane distillation, and evaporation crystallization. Most of the suspended solids and organic matters in the wastewater are removed with the submerged membrane bioreactor; hardness matters such as multivalent ions, and part of the remaining organic matters in the wastewater are removed through nano-filtration, such that nano-filtration produced water and nano-filtration concentrated water are obtained; the nano-filtration produced water is subjected to a deep concentration treatment with the high-efficiency reverse osmosis technology, such that high-efficiency reverse osmosis produced water and high-efficiency reverse osmosis concentrated water are obtained; the high-efficiency reverse osmosis concentrated water is subjected to a membrane distillation deep concentration treatment, such that membrane distillation produced water and membrane distillation concentrated water are obtained; and the membrane distillation concentrated water is subjected to the evaporation crystallization treatment, such that salt solids in the concentrated water are crystallized. Through the above process flow, water resource is recovered to a maximal extent while a wastewater discharge problem is solved , and high-salinity high-organic-matter wastewater zero discharge is substantially realized.

A water recovery method for improving water recovery efficiency may include inflowing a low concentration solution including water into an in-series flow path. The in-series flow path may include a plurality of flow paths for a low concentration solution coupled in series. The method may additionally include inflowing a high concentration solution having the same concentration into a plurality of flow paths for a high concentration solution. Each of the plurality of flow paths for the high concentration solution may be connected to each of plurality of flow paths for the low concentration solution via a respective semipermeable membrane being interposed therebetween.

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 pressure delay osmosis/reverse osmosis combined desalination method, which comprises the following steps of: pressurizing pretreated sewage flow U, successively inputting into first and second pressure delay osmosis devices; pressurizing pretreated seawater flow A, entering into the first pressure delay osmosis device, outputting three flows D, E and F, inputting the flow D into a first energy recovery device for energy absorption, inputting into a first booster pump for supercharging, inputting the flow E into a second booster pump for supercharging, inputting the flow F into a second energy recovery device for energy absorption, inputting into a third booster pump for supercharging, merging the three flows, inputting into a high-pressure membrane module, outputting a strong brine flow P from the membrane module, inputting the flow P into the second energy recovery device to release energy, inputting into a fourth booster pump for supercharging, inputting into the second pressure delay osmosis device, inputting into the first energy recovery device to release energy, outputting product water out from the membrane module, and processing the product water for usage. The method provided by the invention is used to raise energy utilization rate, decrease energy consumption, save desalination cost and reduce discharge load of the strong brine.

Membrane distillation (MD) systems include at least two MD modules arranged in series, each of at least two MD modules including a condensing media inlet operable to receive a condensing media and a condensing media outlet, a feed inlet operable to receive a feed media and a feed outlet, and a first heating element positioned and operable to heat a feed prior to or upon introduction of the feed to a first of the at least two MD modules, wherein a stream exiting the feed outlet of the first of the at least two MD modules is introduced to the second of the at least two MD modules. Other MD systems include at least two MD modules arranged in parallel.

An apparatus for treating wastewater, such as high-solids contend wastewater from a fracking operation, includes a solids-oil-water separation apparatus coupled to a low-pressure membrane filtration apparatus, with a wastewater recycling conduit coupled at one end to the low-pressure membrane filtration apparatus and coupled at a second end to the solids-oil-water separation apparatus, whereby progressive recycling of membrane concentrate from the low-pressure membrane filtration apparatus through the wastewater recycling conduit, into the solids-oil-water separation apparatus, provides recovery of as much as 97% of the water from a raw wastewater stream.

The invention discloses a method for recovering water from hot carrier gas for lignite drying, which comprises the following steps: feeding drying hot carrier gas from a drying unit into a washing tower under the action of a blower, and performing two-stage heat-insulated washing; feeding the tail gas after washing into an air cooler, and indirectly cooling with environmental air; performing gas-liquid separation, feeding the liquid phase into a water recovery tank, and performing simple treatment to ensure that the liquid phase meets the water standard for industrial circulating water; and returning the gas phase to the drying unit for recycling through a circulating tail gas blower. The system disclosed by the invention has the characteristics of low operating cost, favorable quality of recovered water, high water recovery rate and the like.

Belonging to the field of chemical wastewater treatment, the invention relates to a method for treatment of salt-containing wastewater, in particular to a method for treatment of salt-containing wastewater by forward osmosis membrane distillation. The method utilizes high-salt concentration water generated by membrane distillation as a draw solution in forward osmosis, combines forward osmosis andmembrane distillation, recycles water resources and salt at the same time, and realizes regeneration of the draw solution in the forward osmosis process. The method provided by the invention can recycle water resources and salt in the high-salt wastewater while treating high-salt wastewater, the two processes are carried out simultaneously, and promote each other. The technical scheme provided bythe invention can be applied to treatment of high-salt wastewater and the like to realize zero-pollution emission and resource recycling.

Bicarbonate conversion assisted reverse-osmosis (RO) treatment systems for treatment of contaminated water, particularly natural gas flowback water. The systems and processes provide for simultaneous conversion of the primary salt in gas production flowback waters from sodium bicarbonate to sodium sulfate, and flotation removal of organic contaminants, for the enhanced water recovery by RO of these waters. In the systems and processes, RO processes are enhanced by lowering the osmotic potential of the water being processed, by converting the bicarbonate ions to sulfate ions.

An apparatus for reverse osmosis, the apparatus comprising: a single-stage reverse osmosis (SSRO) unit; and a counter-current membrane cascade with recycle (CMCR) unit comprising a plurality of stages of reverse osmosis including at least a first stage and a second stage wherein permeate from the first stage is configured to be introduced as feed to the second stage; wherein retenate from the SSRO unit is configured to be introduced as feed to the first stage, and wherein product obtained using the apparatus comprises permeate from the SSRO unit and permeate from a last stage of the CMCR unit.

The present invention relates to the technical field of liquid separation, and discloses a filter and a water purification apparatus. The filter comprises a shell (10) and a membrane separation unit (20) arranged on the inner wall of the shell (10) and used for filtration, wherein a liquid inlet (100), a passing liquid outlet (101) for allowing a liquid penetrating through the membrane separationunit to pass, and a concentrated liquid outlet (102) for allowing a liquid impermeable to the membrane separation unit (20) are arranged on the shell (10), the filter further comprises a scrubbing unit (30) for scrubbing the surface of the membrane separation unit, and the scrubbing unit comprises a scrubbing head (301) and is arranged for making the scrubbing head selectively contact the membraneseparation unit. According to the present invention, the filter can remove contaminants on the surface of the separation membrane, and has uniform scrubbing friction; and the filter can be inserted into the softening water agent tank to form the water purification apparatus for preparing non-drinking soft water for washing rooms and soft water meeting drinking water standard, and the advantages of low cost, high water recovery rate and the like can be achieved.

Provided are a water treatment system and a water treatment process, which are capable of reproducing water containing salts with high water recovery. A water treatment system 100 comprises a second demineralizing section 210a, 210b that separates water to be treated containing Ca ions, SO₄ ions and carbonate ions into concentrated water in which the Ca ions and the SO₄ ions are concentrated and treated water; a crystallizing section which is positioned on a downstream side of the second demineralizing section 210a, 210b and which includes a second crystallizing tank 221a, 221b that crystallizes gypsum from the concentrated water and a seed crystal supplying section that supplies seed crystals of gypsum to the second crystallizing tank 221a, 221b; and a separating section that is positioned on a downstream side of the crystallizing section and separates the gypsum from the concentrated water.