71 results about "Refinery wastewater" patented technology

There is provided a process of reducing concentration of contaminants in a contaminated wastewater stream, such as contaminated wastewater output from a refinery, such as an oil-refinery; the process comprising: first, passing the contaminated wastewater stream into an electrocoagulation reactor for coagulating dispersed particles, filtering the wastewater stream after electrocoagulation for removing the coagulated dispersed particles, and providing a first stream of treated wastewater after the first filtration; second, passing the first stream of treated wastewater into a Spouted Bed Bio-Reactor (SBBR) containing a micro-organism or bacterium immobilized in polyvinyl alcohol (PVA) gel, filtering the first stream after treatment by the SBBR and providing a second stream of treated wastewater after the second filtration; and third, passing the second stream of treated wastewater into an adsorption column containing granular activated carbon (GAC) and providing a third stream of treated wastewater. There is also provided a system for doing the same.

The invention provides a method of efficiently removing selenium from water. The method involves: adding an oxidant to the liquid, adjusting the liquid's pH to below 7.5, adding ferric salt in an amount such that less than a quarter of selenium in the liquid precipitates and adding a poly dithiocarbamate material to the liquid in an amount such that the amount of poly dithiocarbamate material (in ppm) is greater than the amount of ferric salt (in ppm). This method removes far more selenium than previous methods, and does it using a smaller amount of expensive chemicals. Moreover this method makes it far more likely to achieve cost effective compliance with the ever-increasing environmental standards for selenium in water.

The invention provides a water-free atmospheric vacuum distillation technology and device. The technology is characterized in that a normal-pressure tower and a vacuum tower adopt a four-time gasification and feeding manner; after crude oil is heated through a normal-pressure furnace, materials are fed from a tower kettle of the normal-pressure tower; water steam is not introduced into the tower kettle; each sideline product is heated by adopting a reboiler; alkali washing is carried out on tower top dry gas which is condensed and cooled at a tower top of the normal-pressure tower; a vacuum flashing tower is additionally arranged between the normal-pressure tower and a vacuum furnace; normal-pressure heavy oil from the tower kettle of the normal-pressure tower enters the vacuum flashing tower; the vacuum flashing tower is provided with a plurality of sidelines for drawing out products; the product drawn out from the first sideline is injected into the normal-pressure tower again; the heavy oil of the tower kettle enters the vacuum furnace and is further heated, and then enters the vacuum tower; pressure of the vacuum flashing tower is controlled between the pressure of the normal-pressure tower and the pressure of the vacuum tower. The invention further provides the water-free atmospheric vacuum distillation device. By adopting the device and the technology, provided by the invention, the low-temperature dew-point corrosion problem of the top of the normal-pressure tower can be solved, refinery wastewater is reduced and the diesel oil extraction rate of the normal-pressureheavy oil is improved; serious entrainment of the vacuum tower is alleviated and the decompression and deep drawing vacuum degree is reduced. The long-period, safe, stable and operation performance ofthe device is improved.

The invention provides a method for stable up-to-standard treatment and resource utilization of refinery wastewater. The method can realize process flows of stable up-to-standard release of refinery wastewater and sewage recycling at the same time. According to the method, regulating tanks are additionally arranged to strengthen a pretreatment flow and the treatment depth of a sewage treatment system to ensure that important indexes of discharged water can stably reach standards, and a membrane bioreactor process is adopted to reach a sewage recycling standard, so that the stable up-to-standard release of discharged water of the refinery wastewater generated after crude oil poor-quality treatment as well as water saving and emission reduction recycling of the refinery wastewater are realized, and the process flow of ensuring the stable up-to-standard release of the refinery wastewater is realized by strengthening pretreatment and increasing the biological treatment depth. Meanwhile, the water saving and emission reduction of the refinery wastewater are realized through a sewage recycling process, part of the sewage is recycled, and the discharged quantity of the sewage can be reduced. The method provided by the invention can be used in the field of stable up-to-standard release and recycling of the refinery wastewater.

The Rhodococcus erythropolis involved in the present invention is Rhodococcus erythropolis SDUZAWQ, which was preserved in the "General Microorganism Center of China Committee for the Collection of Microorganisms" on March 1, 2004, and its preservation number is CGMCC No.1129. The strain is isolated from refinery sewage and soil; the cell culture fluid of the strain can efficiently remove dibenzothiophene, 4,6-dimethyl-dibenzothiophene, 4-methanol through oxidative cleavage of C-S bond Sulfur in base-dibenzothiophene, benzothiophene, and 5-methyl-benzothiophene; Rhodococcus erythropolis SDUZAWQ was cultured with a mixed sulfur source of dibenzothiophene and sodium sulfate, and the resting cell culture medium obtained could effectively remove the Sulfur in Hydrotreated Diesel.

The invention belongs to the field of wastewater treatment, and particularly relates to an MBBR and an oil refining wastewater treatment system. The invention provides an MBBR. Dissolved oxygen concentrations of different treatment sections are controlled according to a specific DO curve, a bacterial colony structure is adjusted, and a front-section treatment unit is used for carrying out buffer adjustment on wastewater; the microorganisms in the rear-section treatment unit further reduce COD and BOD in the wastewater, so that stable effluent quality is ensured; based on the MBBR, the invention further provides a treatment system. An A+MBBR+O combined process is matched with an efficient microbial preparation to treat the oil refining wastewater. The treatment efficiency and the impact resistance of the system are improved, the stability of the effluent quality is ensured, the impact caused by water quality fluctuation is relieved, the operation stability is improved, meanwhile, the MBBR is used as a process combining a suspension growth activated sludge method and an adhesion growth biological membrane method, the occupied area is small, the system operation cost is further reduced, and the capital construction cost is reduced.

The invention relates to a method for deep processing and recycling oil refining wastewater. A technical scheme of the invention includes: adding 15-25 mg / L inorganic / organic composite coagulant into biochemically-treated oil refining wastewater for coagulating, and removing colloid and residual macromolecular organics in the oil refining wastewater; pumping the coagulated oil refining wastewater into an ozone catalytic oxidation column, wherein a ceramsite catalyst using manganese nitrate, titanium dioxide and copper nitrate as active ingredients is disposed in the ozone catalytic oxidation column; introducing ozone gas, keeping ozone concentration in a liquid phase under 25-35 mg / L, and reacting for 12-15 min; finally, pumping the oil refining wastewater subjected to ozone catalytic oxidation into a polyvinylidene fluoride tubular-membrane ultrafiltration membrane assembly, and using effluent of the polyvinylidene fluoride tubular-membrane ultrafiltration membrane assembly as supplementary water of recirculating cooling wat4er of a refinery for refuse.

The invention provides a composite flocculant for refinery wastewater treatment, and a refinery wastewater treatment method. The composite flocculant for refinery wastewater treatment is prepared fromthe following components in parts by weight: 8-15 parts of an aluminum salt, 6-10 parts of a zinc salt, 0.02-0.05 part of an organic flocculant, 3-4 parts of an organic complexing agent, 70-85 partsof water and an inorganic strong acid, wherein the concentration of the inorganic strong acid in the composite flocculant is 0.025-0.085 mol / 100 g. The composite flocculant for refinery wastewater treatment provided by the invention solves the problem of loose floc of a single organic flocculant, and has the advantages of high flocculation efficiency, large and compact floc, small addition amount,low cost and the like when being used for treating refinery wastewater.

The invention discloses a reusing treatment method of refinery waste water. Oil removing and suspended matter treatment, sequencing bath reactor (SBR) treatment and osmotic membrane bioreactor (OMBR) treatment are performed in sequence on the refinery waste water. The reusing treatment method is suitable for deep purification and reusing treatment of various types of waste water in an oil refinery, and the water quality of treated water is similar to that of reverse osmosis outlet water.

Disclosed is a process to remove neutrally buoyant metal particles composed of solid particles and droplets of oil from water such as produced water from petroleum production or refinery wastewater. In one aspect, the water is contacted with oleophilic adsorbent materials which adsorb the neutrally buoyant metal particles. Also disclosed is a process for removing metal particles from a fluid volume that includes crude oil and / or condensate. The fluid volume is washed with a volume of water to form a volume of wastewater, thereby transferring at least a portion of the metal particles from the fluid into the wastewater. The volume of wastewater including the transferred metal particles is then contacted with an oleophilic adsorbent material wherein the neutrally buoyant metal particles are adsorbed by the adsorbent material. The adsorbent material is then separated from the wastewater. Finally, the treated wastewater is used to wash the crude and / or condensate.

The invention relates to a device for treating high-concentration ammonia nitrogen in refinery wastewater by using a surface activity catalyst, belonging to the field of sewage treatment. The device is composed of a wastewater inlet (1), a surfactant inlet (2), a pipeline mixer (3), an injection pipe (4), a heavy metal catalyst network (5), a denitrification cylinder outer shell (6), a denitrification cylinder inner shell (7), a wastewater channel (8), a wastewater outlet (9), a diversion intake port (10) and a blast blower (11), wherein the surfactant inlet (2) is positioned above the pipeline mixer (3) and connected with the pipeline mixer (3); the wastewater inlet (1) is connected with the pipeline mixer (3); and the pipeline mixer (4) is positioned above the heavy metal catalyst network (5). The device is simple in technique and feasible in operation, can directly reduce the ammonia nitrogen in the refinery wastewater into nitrogen to be discharged, can not cause secondary pollution to the environment, and has the advantages of low cost and high ammonia nitrogen removal ratio. The ammonia nitrogen removal ratio in the high-concentration ammonia nitrogen wastewater treated by the device can reach 99.9% above.