51results 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.

Disclosed is a process that uses reverse osmosis (RO) or nanofiltration (NF) membranes and ion exchange (IX) water softening resins to maximize the production of drinking water, purified industrial service water or recycled purified municipal or industrial effluents. The membrane and ion exchange units are configured in a manner that enables operation of the system at high permeate recoveries in the range 90% to 99%, thus producing purified drinking water with a minimum volume of wastewater to drains and a very low membrane cleaning or membrane replacement frequency. The process mitigates membrane fouling and scale formation and minimizes the use of water treatment chemicals including acidic and alkali solutions and sodium chloride salt that is normally required to regenerate the IX resin.

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.

The invention relates to a full-membrane method seawater desalting integration system adopting ultrafiltration-nanofiltration-reverse osmosis, and a full-membrane method seawater desalting integration process adopting ultrafiltration-nanofiltration-reverse osmosis, wherein the nanofiltration seawater softening recovery rate can be increased, and the membrane surface scaling tendency can be reduced. According to the present invention, the nanofiltration system is a three-stage nanofiltration system, wherein the first-stage nanofiltration membrane assembly and the second-stage nanofiltration membrane assembly are adopted as the pretreatment of the reverse osmosis, and the third-stage nanofiltration membrane assembly further treats the concentrated water obtained through the first-stage nanofiltration and the second-stage nanofiltration, such that the seawater recovery rate is increased, and the scaling tendency on the nanofiltration membrane surface of the first-stage nanofiltration membrane assembly and the second-stage nanofiltration membrane assembly is reduced so as to reduce the seawater desalting cost and reduce the scaling tendency of the third-stage nanofiltration membrane assembly during the high salinity concentrated water treatment.

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 relates to the field of industrial wastewater treatment, in particular to a high-salinity wastewater zero-discharging method. According to the method, a 'resin adsorption + efficient reverse osmosis + membrane distillation + evaporative crystallization' method is adopted to treat high-salinity wastewater. Firstly, resin adsorption is adopted to remove hardness and a little amount of organic matter in the high-salinity wastewater, then efficient reverse osmosis is adopted to further concentrate the high-salinity 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 wastewater is basically achieved.

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.

During inorganic inducing treatment of reverse osmosis concentrate, dolomite with CaMg(CO3)2 as main component is used as inorganic inducing agent TAN to treat the reverse osmosis concentrate containing universal antiscale. The inorganic inducing agent reacts with Ca2+, Mg2+ and HCO3- ion to make the high saturated scaling ion deposit out; then aluminum sulfate is added through stirring to coagulate; and the solution is filtered and deposited to obtain treated reverse osmosis concentrate. The inorganic inducing agent is cheap and non-toxic, the treating process is low in cost and environment friendly, and the treated concentrate may be reused as useful resource to raise the water recovering rate of reverse osmosis system.

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.

A wastewater stream including ammonia and water is fed to at least one packed column including packing material having a surface of solid magnesium phosphate or solid magnesium ammonium phosphate or both. Each of the packed columns is capable of cycling between an ammonia absorption operation and an ammonia regeneration operation. The magnesium phosphate compound reacts with the water and ammonia to form a magnesium ammonium phosphate compound. In one embodiment, this system provides for the regeneration of the magnesium ammonium phosphate compound for further use as an ammonia sorber. In another embodiment, the magnesium ammonium phosphate compound is used as fertilizer. Additionally, the ammonia capture and recovery system may be used in conjunction with other unit operations in an overall wastewater treatment system.

A backwashing method incorporating a membrane filtration apparatus in which a ceramic filtration membrane including a substrate layer 11b having an extremely large number of filtration pores and a separating layer 11a having filtration pores smaller than those of the substrate layer is accommodated in a casing. Air controlled to a pressure p1 is supplied to the secondary side of the filtration membrane so as to drain the filtrated water in the membrane filtration apparatus gradually toward the primary side. After that, air pressure is increased to p3 so as to push the water in the filtration membrane toward the primary side together with the air, thereby peeling off any fouling substances. Unlike in conventional cases, a large amount of backwashing drain water is at no time drained at any one time, and thus, without reducing the effectiveness of backwashing, a backwashing drain pipe can be designed to have a small diameter. As a result, equipment can be reduced in size and the flexibility of equipment can be enhanced.

The present invention relates to waste water treating technology, and is especially the method of eliminating scaled calcium sulfate salt in reverse osmosis concentrate. Coagulant capable of coagulating the nanometer particle formed by scaling ions Ca2+ and SO42- in the concentrate is used in treating the reverse osmosis concentrate to deposit oversaturated scaling ions. The deposit is then eliminated through filtering, and the concentrate with less scaling may be reused in the reverse osmosis, reaching raised water recovering rate of the reverse osmosis system. The present invention has aluminum sulfate used as the coagulant, low treating cost, environment friendship and raised water recovering rate.

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.

In a water treatment system and a water treatment process, a scale inhibitor is supplied to water to be treated containing Ca ions, SO4 ions, carbonate ions, and silica, and the water to be treated is adjusted to a pH at which silica is soluble. The pH-adjusted water containing the calcium scale inhibitor is separated in a first demineralizing section into concentrated and treated water. In a first crystallizing section, seed crystals of gypsum are supplied to the first concentrated water, whereby gypsum is crystallized and removed from the first concentrated water. Silica in the water to be treated is removed from the first concentrated water on the downstream side of the first crystallizing section. Calcium carbonate in the water to be treated is removed from the first concentrated water on the upstream side of the first demineralizing section or the downstream side of the first crystallizing section.

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.

The invention discloses a reverse osmosis membrane element realizing water inflow from a side surface. The reverse osmosis membrane element comprises a reverse osmosis membrane group, a central tube member and a pure water pipeline. Raw water is fed from the side surface of the reverse osmosis membrane group; the reverse osmosis membrane group is bidirectionally wound to form a pure water flow channel and a water inflow channel respectively located in and out of the reverse osmosis membrane group, and a pure water pipeline is located in the pure water flow channel; the central tube member includes a wastewater outlet channel and a body arranged around the wastewater outlet channel; the wastewater outlet channel is located in water inflow channel; the body includes a main body portion and anotch; the side surface of the main body portion is provided with a plurality of wastewater passing holes communicating with the wastewater outlet channel; and the pure water pipeline is arranged inthe notch, and the side surface of the pure water pipeline is axially provided with a number of pure water passing holes. The design of the reverse osmosis membrane element realizing water inflow fromthe side surface in the invention can well improve the surface flow velocity of a membrane, reduce the phenomenon of concentration polarization of an RO membrane, improve the anti-pollution ability of a household RO membrane element and the water recovery rate of the RO membrane, and prolong the service life of the reverse osmosis membrane group.

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.