2549 results about "Reclaimed water" patented technology

The invention relates to an ecological greenbelt treatment process for treating rural domestic sewage, which mainly comprises the steps of: (1) anaerobic pretreatment: performing anaerobic hydrolysis pretreatment to domestic sewage; (2) artificial wetland treatment: performing artificial wetland treatment to pretreated domestic sewage; and (3) shallow ecological pond aerobic biotreatment: further performing shallow ecological pond aerobic biotreatment to outlet water treated by the artificial wetland, degrading and converting organic matters and nutrients entering the pond, and recycling purified sewage as a regenerated water resource. The invention adopts an ecological greenbelt treatment system comprising the anaerobic pretreatment, the artificial wetland and the shallow ecological pond to treat the rural domestic sewage, and has the characteristics of good treatment effect, recycling on site, low investment, low system operating cost, simple maintenance, obvious ecological benefit and the like.

An internal-combustion engine receives no air from outside atmosphere. Instead, combustion gas expelled from the engine is cooled and recycled back into the engine. That gas contains no nitrogen and consists mostly of carbon dioxide and water vapor. Oxygen and fuel are added to the recycled gas, and the resulting mixture is used to perform an internal-combustion cycle. Cooling that gas condenses its water vapor, and liquid water is separated from the gas. That water is used for injection into the recycled gas at a later time. A small amount of the expelled combustion gas is discharged into outside environment, and the rest is recycled. Water too is recycled back into the engine, and whatever is lost to outside environment is replaced by reclaiming water produced in combustion. No additional supply of water is needed. Since no nitrogen is present, no nitrogen oxides are produced. The amount of other harmful exhaust emissions is greatly reduced too, since most of them are recycled back into the engine. Water evaporation in the cylinders greatly improves fuel economy. The engine is inherently supercharged with combustion-gas pressure, and no turbocharger is needed. Since the combustion gas is heavier than air, the engine can be substantially smaller than a conventional engine of equal power. A smaller engine has less friction.

The invention relates to a method for recovering active carbon fibre organic waste gas by taking nitrogen as desorption medium, belonging to the field of environmental protection. The method for recovering active carbon fibre organic waste gas by taking nitrogen as desorption medium takes the active carbon fibre as a fixed bed adsorber of the adsorbent, adopts thermal nitrogen desorption and can recover and reuse the organic waste gas and nitrogen at the same time. The method of the invention adopts the thermal nitrogen adsorption, generates no secondary contaminant, realizes that the exhaust reaches the standard of the environmental protection, leads the adsorption layer to keep dry at the same time, improves the utilization ratio of the active carbon fibre and prolongs the service life of the active carbon fibre. As vapour is not used for desorption, the equipment has no corrosion problem, thus greatly reducing the manufacture cost of the equipment. The method of the invention has extremely good recovery effects on solvent with large water solubility and easy hydrolysis performance and organic waste gas with high boiling point, has low water content in the recovered products, high quality of the solvent and reduces the running cost.

An aeroponic plant growing system includes a water reservoir and growing chambers for growing plants in an aeroponic environment. A pump, a water distribution manifold, and water lines are used to provide water and nutrients from the water reservoir to sprayers in the growing chambers where the water and nutrients are sprayed on the roots of plants growing therein. The water distribution manifold and water lines preferably are provided as closed loop systems, such that water is provided to all sprayers despite a blockage in the manifold or a water line. Non-absorbed water and nutrients are returned to the water reservoir from the growing chambers on water return lines via a filter that includes multiple types of filter media, including filter media that support the colonization of organisms that support plant growth.

An oxygen containing gas is injected at a pressure in the range of about two (2) to about five (5) atmospheres or more into an ultraviolet transmissive sleeve surrounding an ultraviolet lamp to produce a high concentration of ozone. Simultaneously, the ultraviolet lamp irradiates water to be purified disposed in a container surrounding the sleeve. The ozone enriched gas is entrained into the water flowing into the container resulting in an oxidative reaction with any organic matter present and coming into contact with the ozone. Alternatively, the ozone may be entrained in water in a second container downstream of the container wherein the water has been irradiated with ultraviolet radiation. In a further variant, the ozone may be entrained in water in a container upstream of the container wherein the water has been irradiated with ultraviolet radiation. In a yet further variant, the ozone may be entrained in one or more containers upstream and prior to irradiation of the water with ultraviolet radiation in the downstream most container. The ozone may be extracted from the ozonated water prior to discharge if the oxidative effect of the ozone is not desired for the intended end use. To enhance ozone production a predetermined pressure is maintained within the sleeve. To prevent damage to sleeve in the event of a drop in pressure of the water surrounding the sleeve, a further differential pressure regulator may be used to relieve the pressure within the sleeve by discharging ozonated gas from within the sleeve. By use of specifically configured end caps for the sleeve, certain existing water purification systems may be converted to embody the present invention.

A method of treatment of water in an aquatic environment. Water is first pumped from a reservoir to a first mixing station. An inert gas is introduced into the pumped water at the first mixing station to provide inert gas saturated water, which inert gas saturated water will displace undesired gasses in the water in the reservoir. The inert gas saturated water is then pumped to a sparging column such that the inert gas and undesired gasses will be released from the inert gas saturated water to provide depleted water. The depleted water is then pumped to a second mixing station, wherein oxygen is introduced into the depleted water to provide oxygen enriched water. The oxygen enriched water is then returned to reservoir.

The invention relates to a process for treating oily sludge and is particularly applicable to the oily sludge generated in the wastewater treatment process of an oil refinery. The process has the following steps of: after performing anhydration treatment on centrifugally dehydrated oily sludge in rotary-type anhydration treatment equipment under certain negative pressure and temperature control to destroy a water, oil and solid stabilizing system of the oily sludge, evaporating part of oil and water in the oily sludge, and performing solvent extraction treatment on coke generated after the anhydration. Solid residue obtained after treatment reaches the solid emission standard; the wastewater generated in the process can reach standard after biochemical treatment and is discharged; the extracted oil can be used as fuel or used for refining; and an extractant can be regenerated and recycled. The process has main characteristics of high sludge anhydrating and extracting speed, high efficiency, good effect, mild operating condition, little energy consumption, good sludge treatment effect and simple equipment operation and maintenance.

The invention discloses a method for producing high-quality sodium fluoride from fluorine-containing wastewater as a raw material. The method comprises the following steps: directly adding excessive sodium carbonate into the fluorine-containing wastewater to completely crystallize and separate fluorine in the solution in a mode of sodium fluoride, or firstly, adding amino into the fluorine-containing wastewater so as to obtain an ammonium fluoride solution, or firstly, precipitating and enriching the fluorine in the fluorine-containing wastewater, secondly, converting a precipitated and enriched product into an ammonium fluoride solution by using an ammonium salt solution, adding excessive sodium carbonate into the ammonium fluoride solution to completely crystal and separate the fluorine in the mode of sodium fluoride, and filtering so as to obtain sodium fluoride filter cakes and a post fluorine precipitation liquid; and washing the sodium fluoride filter cakes by using the ammonium fluoride solution, drying so as to obtain a high-quality sodium fluoride product of which the purity is up to 99.25% or greater, crystallizing the post fluorine precipitation liquid to recycle sodium carbonate in the post fluorine precipitation liquid, further desalting a sodium carbonate crystallization mother liquid, and recycling reclaimed water. The method has the advantages of being simple and convenient to operate, high in fluorine recycling rate, low in production cost, good in sodium fluoride product quality, free of fluorine-containing waste and the like.

The invention belongs to the field of waste water treatment and reclaimed water reuse, in particular to a method and a device for the zero-emission treatment of high-hardness waste water containing sulfate. The method for the zero-emission treatment of high-hardness waste water containing sulfate comprises the following steps: 1) sequentially substituting calcium and magnesium ions in waste water into sodium ions by a double-alkali process and an ion exchange process and simultaneously removing most alkalinity so as to promote sulfate radicals and chlorine ions to be the main components of rest anions in water and promote sodium ions to be the main component of cations; 2) concentrating waste water obtained in step 1) through reverse osmosis and reclaiming produced water; 3) separating and concentrating concentrated water treated by reverse osmosis in step 2) through nanofiltration so as to obtain nanofiltered concentrated water of which the main component is sodium sulfate and nanofiltered produced water of which the main component is sodium chloride; 4) after concentrating the produced water nanofiltered in step 3) through reverse osmosis or positive osmosis, evaporating and concentrating; 5) removing sulfate radicals from the concentrated water nanofiltered in step 3). The concentrating times of waste water is increased as much as possible, and the evaporating quantity of waste water is reduced.

The invention extends the connotation range required to be protected on the basis of a previously issued patent ZL200710025045.4, i.e., a nanometer microcrystalline composite filter material and a preparation method thereof, belonging to the field of a water disposal technique material. According to weight percentage, the nanometer microcrystalline composite filter material comprises 3-95 percent of attapulgite clay, 5-80 percent of sepiolite clay, 2-25 percent of kaolinite clay, 2-97 percent of tubular halloysite, 5-75 percent of diatomite, 5-75 percent of natural zeolite (clinoptilolite, mordenite and the like), 0-25 percent of pillared montmorillonite, 0-50 percent of expanded vermiculite, 0-5 percent of expanded perlite and 0-50 percent of active carbon or bamboo carbon powders. All raw materials which are powder shapes are mixed according to proportion and stirred to granulate by adding an inorganic adhesive, then sintered and activated at the temperature of 900-500 DEG C (inert gas is required for sintering and activating the filter material added with active carbon). The nanometer microcrystalline composite filter material has smooth shape, rough surface and uniform particle size, with the diameter of 1-10mm, and is used for biological filter tanks and high-class adsorption filter materials in deep purification systems of drinking water and reclaimed water sewage disposal systems.

Simultaneous slicing and washing of relatively firm raw vegetable or fruit products is accomplished in a vat of water into which a slicer apparatus is positioned such that the slices are formed and discharge directly into the water An inclined takeout conveyor serves to receive the slices and remove them from the water. A circulating water current and fluid jets urge the slices to disperse onto the conveyor. A spray of water or air blast removes residual vegetable matter from the slice surfaces before leaving the takeout conveyor for further processing. Slicing and washing a vegetable in a flume volute where the slices are dispersed onto a takeout conveyor is disclosed where the water medium is collected in a tub and recycled back to flow in the flume to a level that covers the slicer's operative parts. The apparatus may be used for simultaneous slicing and cooling of raw vegetables where hot cooling oil is maintained in the system and recycled for reheating.

The invention discloses a reclaimed water treatment system combining an upflow aerating biological filter with horizontal underflow artificial wetland. The system consists of the upflow aerating biological filter and the horizontal underflow artificial wetland; the upflow aerating biological filter comprises a water inlet guide tube positioned at the bottom of the filter; a filter plate, a supporting layer, an A section filler area, a B section filler area and a water outlet area are sequentially arranged above the water inlet guide pipe; a communicating water pipe is mounted on the water outlet area, and communicated with a regulating tank of the horizontal underflow artificial wetland; an aerator pipe is led out of the supporting layer; the regulating tank and a matrix area parallel to the regulating tank are arranged at the lower layer of the horizontal underflow artificial wetland; the matrix area sequentially comprises a macadam area, a steel slag area, a zeolite area and a water outlet gravel area from left to right; the water outlet gravel area is equipped with a water outlet pipe; and a soil covering layer and aquatic plants are arranged at the upper layer of the horizontal underflow artificial wetland. With the adoption of the system, on-site treatment and utilization of sewage are achieved; the sewage treatment process flow is simplified; and operation and management costs are lowered.

The invention discloses a system and a method for treating water recycled from straw pulp papermaking wastewater. The system is formed by sequentially or respectively connecting a regulating tank, a primary efficient coagulative precipitation tank, a secondary efficient coagulative precipitation tank, a middle water tank, an ultrafiltration membrane treatment device, a reverse osmosis membrane treatment device, an ozone contact oxidation tower, an active carbon adsorption tower, an acid regulating tank, a higher oxidization reaction tank, a neutralizing precipitation tank and a water-producing tank. The system organically combines the coagulative precipitation treatment, the higher oxidization treatment, the ozone catalysis oxidation treatment and the treatment of an ultrafiltration membrane and a nanofiltration membrane, treats the water recycled from the straw pulp papermaking wastewater by using a physical and chemical treatment technology and a shunting treatment and combined effluent treatment process and mode, can ensure that the large scale recycled water of the straw pulp papermaking industry reaches the requirement of reuse water after treated and does not affect a papermaking process and a paper product on the premise of ensuring the low operating cost, and the treated reverse osmosis concentrated water reaches the emission standard of the industry.

Parallel desalting (PDS) includes a hybrid membrane softening (MS) system for de-mineralizing water for residential and commercial use. Parallel desalting produces "soft" water without the use of salt, or any other liquid chemical reagent normally used to carry out pH adjustment in industrial membrane and precipitation processes. The PDS process balances the operation of a RO (potable water) membrane unit with the operation of a tubular MF (wastewater) membrane unit, thereby providing a highly efficient and regenerative water treatment technology: (1) The optimum operation for the PDS system transforms roughly 90 percent of a potable, slightly brackish water supply into <50 mg/L TDS water with <1-grain (10-15 mg/L as calcium carbonate)-water hardness; and (2) The operation of the PDS system produces, in salinity terms, in a 100 percent reusable effluent for downstream recycling. Virtual prototype results suggest that with Colorado River Aqueduct source water (570-620 mg/L TDS and 16-grain water hardness), parallel desalting can produce an effluent with a TDS 40-70 mg/L lower than the originating supply (excluding TDS contributed directly by the particular type of use of the soft water).

The invention relates to a deep purification treatment system for high-concentration organic wastewater. The system comprises a grid, an aeration adjustment pool, a coagulation pool, a primary precipitation pool, an anaerobic pool, a hydrolysis acidification pool, an aerobic biofilter, a secondary precipitation pool, deep oxidation equipment, a sludge pool and a recycling water storage pool; through coagulation and primary precipitation, partial organic pollutants and suspended particulate matters in wastewater are removed; through anaerobic, anoxic and aerobic multistage mutual function, firstly, large-molecule organic matters are degraded to small-molecule organic matters; the small-molecule organic matters are decomposed to inorganic oxide and water through aerobic microorganism; the residual organic molecules in the water which are different to have biological decomposition under usual condition are subjected to further oxidation treatment through the deep oxidation equipment; the deep oxidation equipment preferentially selects a photocatalytic oxidation purifier with ozone input; through the oxidation function of ozone under catalysis of an photocatalyst, outlet water formed finally has high purification degree and no biological pollution and can be used as recycled water; and the deep purification treatment system is suitable for treating various wastewater with high concentration and organic pollution.

The invention relates to a kitchen garbage disposal method. The kitchen garbage disposal method adopts a kitchen garbage disposal device which comprises a crushing chamber, a disinfection chamber, a fermentation chamber, a separation chamber, a drying chamber, a sewage treatment cavity, a compression chamber and an organic fertilizer storage box. Through such steps as crushing, disinfection, fermentation, solid-liquid separation, sewage treatment, drying, compression and storage, solids of kitchen garbage form an organic fertilizer, liquid is processed to obtain reclaimed water, produced gas forms marsh gas, and therefore, full recycling and reusing of kitchen garbage are truly realized.

The invention discloses a chemical treatment method, in particular to a method for treating waste water in an environment-friendly mode. The method comprises the steps of oil removal regulation, first-level neutralization/flocculation, first-level sedimentation, aeration oxidation, second-level neutralization/flocculation, second-level sedimentation, aeration oxidation and inclined tube sedimentation. In a first-level neutralization and flocculation pool, lime milk and formulation flocculant are added, and the pH value of the waste water is regulated, wherein the formulation flocculant consists of cationic flocculant and nonionic flocculant. The invention can greatly reduce the treating cost of the waste water and realize recycle of water without adding equipment investment and has the advantages of convenient operation, good effect and the like. The invention can be widely applied to enterprises with chemical engineering pollution.