3799 results about "Chemical oxygen demand" patented technology

The invention discloses a reactor for catalytically oxidizing wastewater through ozone and an application method thereof. The reactor comprises a reaction chamber, a water inlet, a water outlet, a gasoutlet and a circulating water outlet, wherein a separation plate in the reaction chamber is used for separating the lower part of the reaction chamber into a jet flow reaction chamber and a tower type reaction chamber; the jet flow reaction chamber is internally provided with a first catalysis bed layer and an ejector; the circulating water outlet is connected with a working fluid inlet of the ejector; the gas outlet is connected with a sucked liquid inlet of the ejector through a gas circulating pipe; the water inlet is arranged at the bottom of the jet flow reaction chamber; the tower typereaction chamber is internally provided with a tower plate and a second catalysis bed layer; the water outlet is arranged at the bottom of the tower type reaction chamber; a gas inlet is communicatedwith the lower side of the tower plate and the gas circulating pipe; the gas circulating pipe is connected with a tail gas outlet. The reactor has the advantages of high mass transfer efficiency, rapid reaction speed, high ozone utilization rate, high COD (Chemical Oxygen Demand) removal rate and the like.

An inclined plate coupled membrane bioreactor for treating feed water having excessive level of nutrients in particular chemical oxygen demand and total nitrogen and suspended solids has an aerobic bioreactor for nitrification and aerobic biodegradation in which membranes are submerged for permeate extraction, and an anoxic bioreactor for denitrification within which the inclined plates are outfitted to confine as much anoxic sludge as possible. An air oxygenating and an air scouring are continuously provided to the aerobic bioreactor to maintain a desired aerobic environment and to mitigate membrane fouling while an intermittent air blowing is provided to the anoxic bioreactor to blow out gaseous content generated through denitrification and to rectify the uniformed flow along the inclined plates. The aerobic sludge is recycled to the lower compartment of anoxic bioreactor and the supernatant of anoxic bioreactor is collected as weir effluent and delivered to the downstream aerobic bioreactor. Permeate is intermittently extracted from the membranes by a suction pump. There is no excess sludge withdrawn from the inclined plate coupled membrane bioreactor throughout the experiment.

The invention discloses a microbial agent for treating ammonia-containing waste water and a preparation method thereof. The microbial agent for treating ammonia-containing waste water mainly comprises three bacterial strains of nitrobacter sp, nitrosobacteria nitrosomonas sp., denitrobacter sp., and the contents of the three bacterial strains can be regulated or proportioned according to specificcultivation conditions and product requirements through methods of oriented domestication, and the like. The cultivation method comprises the following steps of: enriching a bacterial source, purifying and amplifying stage by stage for cultivating. The microbial agent can be used for oriented domestication according to a waste water treatment result so as to improve the content of a target bacterial strain. The cultivation method has the advantages of high cultivation efficiency, large production capacity, and the like and is suitable for commercially producing complex microorganisms for treating the ammonia-containing waste water in a large scale. The obtained microbial agent can effectively treat low-COD (Chemical Oxygen Demand) and high-ammonia-nitrogen waste water, such as waste water of catalyst production, and the like.

The embodiment of the invention discloses a preparation method of an ozone oxidation catalyst loaded with polymetallic oxide. The method comprises the following steps that an ozone oxidation catalyst carrier is pretreated, wherein the pretreatment method comprises the steps that the ozone oxidation catalyst carrier is soaked through an acid solution after being washed through water, and then the soaked carrier is washed to be neutral and dried; immersion treatment is conducted on the pretreated ozone oxidation catalyst carrier at least once, and then calcination is conducted; the immersion treatment comprises the steps that the pretreated ozone oxidation catalyst carrier is immersed in an immersion solution to be immersed for 6-48 h at the temperature ranging from 20 DEG C to 100 DEG C, and then drying treatment is conducted, wherein the immersion solution is a mixed solution of nitrate, sulfate and acetate or chloride of three metal elements of manganese, nickel, iron, cerium, cobalt and copper, and the concentration of each metal element in the immersion solution ranges from 0.01 mol/L to 1.00 mol/L. By means of the preparation method of the ozone oxidation catalyst loaded with the polymetallic oxide, the removal rate of chemical oxygen demand (COD) in sewage can be significantly increased.

The invention comprises a composite microbial agent applicable to efficiency enhancement of common chemical industry sewage treatment systems. The composite microbial agent applicable to efficiency enhancement of the common chemical industry sewage treatment systems meets the demands on treatment on comment pollutants in existing chemical industry and environmental production as well as on establishment of functional bacteria required by a stable bacteria flora. According to one of the schemes, the composite microbial agent is composed of 108 microorganisms of three major functional types. When the composite microbial agent is added together with microbial growth promoting carriers, nutrient agents and the like into a biochemical system, the composite microbial agent can promote establishment of a complete food chain in the biochemical system through various microorganisms with special pollutant degrading capabilities and comprehensive metabolic manners to enhance utilization and metabolic decomposition of pollutants in sewage through the microorganisms, thereby achieving efficient reduction of COD (chemical oxygen demand), ammonia nitrogen, phosphorous, sulfur and like.

A method, system, apparatus and program extracts energy from organic residual materials produced by the manufacturing of biofuels. Energy is extracted from the biofuels residuals using anaerobic bioconversion to produce a fuel for use in the manufacturing process for producing synthetic biofuel or as an additional energy product for sale comprises: providing at least one bioconversion tank for conversion of organic waste material, the bioconversion tank containing an active biomass comprising at least one bacteria that decomposes organic material; providing at least one inlet to the bioconversion for organic material; a processor that receives and stores information on: the status of chemical oxygen demand of the active biomass; and the oxygen provision capability of any organic material that can be fed into the bioconversion tank through an inlet; a mass flow control system controlled by the processor which feeds at least one organic material through an inlet at a rate based at least in part upon the status of chemical oxygen demand in the bioconversion tank as recognized by the processor.

The invention relates to a method for carrying out desalination and zero-discharge processing of power plant desulphurization wastewater by adopting an electrodialysis technology. The method comprises the following steps: neutralizing, precipitating, coagulating and filtering the power plant desulphurization wastewater and removing CODs (Chemical Oxygen Demands), heavy metals, F-ions, gypsum, silicon dioxide, hydroxide of iron and aluminum and other insoluble particles in waste water; separating C1-ions and other monovalent ions in clear liquid from SO3<2->, SO4<2-> and other divalent ions through nanofiltration; desalinating and concentrating water produced by the nanofiltration by adopting a multistage countercurrent reverse electrodialysis method. The method has the advantages that the concentration of the Cl-ions in nanofiltration concentrated water and electrodialysis freshwater generated by the method is lower, and the nanofiltration concentrated water and the electrodialysis freshwater can be returned for flue gas desulfurization; the content of NaCl in a small amount of electrodialysis concentrated water produced reaches above 12 percent, the bivalent ions and other impurities are removed by nanofiltration, and the electrodialysis concentrated water is further evaporated and concentrated, so that chlorine-alkali industry electrolytes and NaCl salt can be obtained. Through the method, the zero-discharge treatment and the resource utilization of the desulfurization wastewater can be realized.

The invention relates to a method for treating comprehensive electroplating wastewater. The electroplating wastewater is separated and the recycling utilization rate of heavy metals resources can be improved by carrying out targeted treatment on each strand of separated water while improving the treatment efficiency. By using the micro-electrolysis function of iron and carbon, complex can be removed while removing COD (Chemical Oxygen Demand) and the biochemical property can be improved, which provides the guarantee for a subsequent biochemical reaction. By using the displacement action of the ion and the carbon, heavy metal ions in the water can be displaced and heavy metal resources can be recycled. Meanwhile, residual heavy metal ions in the water can be recycled by using the combining action of precipitating hydroxides and sulfides. On the basis, the water quality can meet the standard by using the ultrafiltration and reverse osmosis actions. The total hardness and the electric conductivity of the wastewater are superior to the water quality of tap water. Usable metal resources can be recycled, the economic benefit is obtained while achieving the aim of environmental protection and the production cost can be reduced.

A catalytic cracking fume desulfuration wastewater treatment process is characterized in that wastewater is discharged to a slurry pool and is mixed with a flocculating agent, a stirrer is used for stirring the wastewater and the flocculating agent, the wastewater and the flocculating agent are mixed evenly, the wastewater after being mixed is discharged to an expansion tube type filter and is subjected to the coagulation reaction at the lower end of the expansion tube type filter, small particulate matters in the wastewater are flocculated, large flocculating bodies are formed, the solid-liquid separation is achieved through the filtration of a filtering film, thick slag and supernatant fluid are obtained, the supernatant fluid is discharged to an oxidation tank further, the thick slag is subjected to back washing and enters a subsequent filtering box, the thick slag is concentrated and dewatered in the filtering box, mud cakes which are concentrated are transported outwards, the water of dehydration returns to the slurry pool again, is mixed with the wastewater and is processed again, the false chemical oxygen demand (COD) which contains sulfite and bisulfite is oxidized and removed by the supernatant fluid in the oxidation tank, and the sewage which meets standards is discharged. Compared with the prior art, the process has the advantages that the area occupied by devices is small, the operation cost is low, the solid and the liquid can be separated completely, the working environment of workers is good, device parameters can be set in accordance with parameters of different materials, and the application is wide.

The invention relates to a complex heavy-metal waste water emergency quick treatment method, comprising the following steps of: filtering by a sand filter; mixing by a high-speed pump; carrying out an ultraviolet catalyzing ozone reaction; carrying a microwave catalyzing active carbon reaction; carrying micro-electrolytic reaction; circulating waste water; carrying out a Fenton reaction; carryingout electric flocculation on an aluminum electrode plate; and pressing and filtering sludge. Waster water in a circulating slot is pumped into an iron carbon fluidized bed by a fluidizing pump to be circularly treated; an air compressor is connected with the iron carbon fluidized bed and prevents a filler in the iron carbon fluidized bed from blocking; and the microwave active carbon reactor is an active carbon filling tower, and a microwave emitter is arranged outside the body of the active carbon filling tower. The complex heavy-metal waste water emergency quick treatment method disclosed by the invention is used for treating the complex heavy-metal waste water, associated devices are simple, easy, quick, can meet an emergency, and can update and convert, no various chemical raw materials are fed, and various complex heavy-metal waste water with unknown elements can be quickly treated as long as the current magnitude is regulated, and thus the heavy metal in the waste water and chemical oxygen demand can immediately reach the standard and are discharged.

The invention relates to an integral treatment process of the oily sewage of an oil field. The process flow in the invention is as follows: settling sand, removing oil, breaking emulsion through air flotation, treating with a microwave-enhanced Fenton system, performing flocculation and air flotation, performing precision filtering, performing catalytic ozonation with an activated carbon fiber felt, and performing ultrafiltration to obtain clean water. By adopting the integral treatment process, the operations of oil removal, emulsion breaking, advanced oxidation, flocculation, catalytic ozonation and membrane separation can be continuously realized. The floor space of equipment in the invention is small; the treatment process is suitable for various oily sewage and has obvious treatment effect; the removal rate of the chemical oxygen demand (COD) of raw water is more than 96%, and the oil content and the removal rate of suspended matters are 100%; and the turbidity of the obtained water is 4-6 NTU. The main indexes of the process provided by the invention such as the COD, oil content, suspended matters, turbidity and the like are better than those of the current oily sewage treatment process in oily sewage treatment; and the quality of the treated water can meet the related rules of the Integrated Wastewater Discharge Standard (GB8978-1996) and the Environmental Quality Standards for Surface Water (GB3838-2002).

The present invention provides reactor designs, component designs, and operating schemes for removing nitrates and chemical oxygen demand from any suitable wastewater stream. The invention also provides reactor designs, component designs, and operating schemes designed to modify and improve pH and water quality in wastewater streams.

The invention relates to a biological denitrification method for salt-containing sewage, which comprises the following steps: adding a denitrification microbial inoculant into a biochemical sewage treatment system, and simultaneously starting the nitrification-denitrification biological denitrification treatment processes, wherein the sewage treatment temperature is 18-40 DEG C, the dissolved oxygen is 0.1-5 mg/L, and the pH value is 7.0-9.0. The denitrification microbial inoculant contains one or two of Staphylococcuscohnii FSDN-C, Arthrobactercreatinolyticus FDN-1 and Flavobacteriummizutaii FDN-2, and also contains one or two of Paracoccusdenitrificans DN-3 and Methylobacteriumphyllosphaerae SDN-3. The method provided by the invention can effectively treat high-salt-content sewage, enhances the adsorptivity and flocculence for sludge, has wide application range for wastewater quality and high impact resistance to salt-containing sewage, and obviously enhances the sewage treatment effect on the premise of removing pollutants, such as ammonia nitrogen, COD (chemical oxygen demand) and the like.

The invention relates to a comprehensive electroplating wastewater treating agent. The comprehensive electroplating wastewater treating agent is composed of the following components in percentage by mass: 10-35% of reducing agent, 20-50% of sulfide, 10-30% of aluminum salt, 10-30% of adsorbing material and 5-15% of alkaline substances. The raw materials of the treating agent provided by the invention are low in cost and easy to obtain, and the treating agent is easy to prepare; through compounding the raw materials, a synergistic effect is exerted, and the treating agent is favorable in broad spectrum, capable of effectively removing heavy metals such as nickel, chromium, copper, zinc and the like, high in removal rate up to more than 96% and relatively good in COD (Chemical Oxygen Demand) removal effect; the comprehensive electroplating wastewater treating agent also has the characteristics of strong electroplating wastewater treating capacity, high heavy metal ion sedimentation speed and efficiency, no secondary pollution after treatment and the like; in addition, the treating agent provided by the invention is convenient to use, simple and feasible in treating process, capable of realizing operation by only using a vessel or pool with an aerating agitation device, reducing the floor area and reducing the investment, and easy to realize operation management.

The invention discloses a method for extracting and dephenolizing coal chemical industry wastewater. Two different solvents are used as extracting agents, and serially-connected double-tower two-stage extracting dephenolization is adopted. The method comprises the following steps of: after carrying out gravity settling oil removal pretreatment on high-concentration phenol-contained wastewater produced in the coal chemical industry process and deacidifying, deaminizing and removing mechanical impurities, carrying out first-stage extracting dephenolization with the first solvent as the extracting agent; and carrying out second-stage extracting dephenolization with the second solvent as the extracting agent and conveying dephenolized water into a biochemical treatment working section. The wastewater subjected to first-stage dephenolization has the total phenol content of 400-1,000mg/l and the COD (Chemical Oxygen Demand) of 2,000-5,000mg/l; the wastewater subjected to second-stage dephenolization has the total phenol content of smaller than 300mg/l and the COD of smaller than 2,000mg/l; and the total phenol removal rate is larger than 90 percent, and the polyphenol removal rate is larger than 70 percent. The invention can meet the requirement of water quality of biochemical treatment, has the advantages of high phenol removal rate, less solvent dosage and low energy consumption and is particularly suitable for treating the wastewater which has high polyphenol content and is produced in the coal gasification, coking and chemical industry synthesis process.

The invention discloses an advanced treatment method for fracturing flow-back fluid, belongs to the field of water treatment of the development of oil and gas fields, and particularly relates to an advanced treatment method for the fracturing flow-back fluid generated during the operation of the oil and gas fields. The treatment method for the fracturing flow-back fluid, which has high effect and continuous treatment process, is provided to solve the problems that the treatment effect is lower, the continuous treatment cannot be performed, and the cost is higher existing in the prior art. The method comprises the following steps of: pre-oxidizing waste liquor with the pH value of between 8 and 12, adding a coagulant and performing gel breaking treatment and adding a Fenton reagent and treating, and performing secondary coagulation and oxidization treatment. In the method, through homogeneous and heterogeneous catalysis reactions, the treatment cost is reduced, and the removal rate of organic substances is also high; and chemical oxygen demand (COD) of effluent can meet the national sewage discharge standard.

The invention discloses a water treatment method utilizing complex-ferrous-activated persulfate oxidation. The treatment method comprises the following steps: (1) firstly determining the pH value and CODcr (chemical oxygen demand) value of wastewater to be treated; (2) adding a complexing agent which is selected according to the pH value to the wastewater, and then adding ferrous ion to the wastewater for sufficiently mixing; and (3) adding a persulfate to the wastewater treated in the step (2) according to the CODcr value for full reaction to obtain purified wastewater. The method is applicable to the wastewater with various pH values; by using the method, the acid feeding cost is greatly reduced and the treatment cost of per ton of wastewater is lowered by approximate 20%; in addition, complex ferrous can slowly release free ferrous ion, thus ensuring that organic pollutants in the wastewater are durably and efficiently purified by a persulfate oxidation method and increasing the pollutant removal efficiency by 20-30%; and the method has the advantages of good durability and high efficiency, is environmentally-friendly, is easy to operate, and has great application potential in the field of environmental pollution treatment.

The invention relates to the technical field of sewage treatment agents and specifically relates to a domestic sewage treatment agent and a preparation method thereof. The domestic sewage treatment agent comprises the following raw materials in parts by weight: 10-20 parts of ferric trichloride, 5-8 parts of ferrous sulfate, 5-8 parts of magnesium sulfate, 3-5 parts of polyacrylamide, 10-20 parts of caustic soda flakes, 20-35 parts of modified lignin sulfonate, 10-15 parts of starch xanthate, 20-30 parts of modified diatomite, 15-20 parts of cross-linked rectorite and 1-5 parts of chitosan-graphene composite material. The domestic sewage treatment agent provided by the invention is capable of continuously treating high-concentration domestic sewage under the coordination action of the compounded raw materials; in the meantime, the contents of COD (Chemical Oxygen Demand), BOD (Biological Oxygen Demand) and SS (Suspended solids) in the treated domestic sewage are obviously reduced; the treated water can be recycled repeatedly.

The invention provides complete equipment and process for processing coal tar wastewater, and belongs to the technical field of environmental conservation. The process comprises the following steps of: adopting different removal principles according to different physicochemical properties of heavy oil, light oil and emulsified oil; scientifically and orderly removing the heavy oil, light oil and emulsified oil through three sets of environmental conservation equipment such as a multi-stage oil separator, an oil-water separator and an air floating tank gradually; combining a micro electrolysis reactor with a five-section integrated oxidization device; and firstly destroying a benzene ring by microelectrolysis, and then strongly oxidizing various organic matters through an oxidant, so that the COD (chemical oxygen demand) and the chromaticity are greatly reduced. Ammonia nitrogen can be efficiently removed by a denitrification system; the denitrification system is low on requirements of pH value and temperature, and low in operation cost; the denitrification system is arranged behind the five-section integrated oxidization device; the reaction change of power of hydrogen is fully considered; and the complete equipment complies with the scientific principle, and can be used for reducing feeding of acid and alkali, and lowering the operation cost.

The invention discloses a method for rapidly and efficiently degrading pollutants through ultraviolet catalytic wet oxidation at the normal temperature and normal pressure and designs a typical device for implementing the method. In the method, ultraviolet light, an oxidant and a catalyst are introduced into a reaction system; and a wet oxidation reaction can be performed under the mild conditions of normal temperature and normal pressure by utilizing the synergistic catalytic oxidation of the ultraviolet light, the oxidant and the catalyst. Compared with the traditional catalytic wet oxidation method which needs to be implemented under the reaction conditions of high temperature and high pressure, the method can be implemented under the conditions of a temperature of between 25 and 80 DEG C and normal pressure, wherein organic pollutants in high-concentration toxic and hazardous waste water can be decomposed to be harmless components such as carbon dioxide (CO2), water and the like through the high oxidizing property; and the removal rate of chemical oxygen demand (COD) chromium (Cr) after the treatment of a plurality of representative high-concentration organic waste water can reach over 95 percent, and the biochemical property can be improved obviously. The method has the advantages of mild reaction, high treating efficiency, complete degradation, clean and environmental-friendly process, energy conservation and wide application prospect.

The invention relates to a comprehensive utilization method of high-concentration waste saline water containing Na<+>, Ka<+>, NH<4+>, Cl<->, SO4<2-> and NO<3-> in the coal chemical industry. After the high-concentration waste saline water is subjected to softening for impurity removal and subjected to coagulation sedimentation to remove COD (chemical oxygen demand), the water is concentrated by 20%-30% through an air cooler; then, the water enters second and third concentration systems and a salt mixture recovery system, and sodium sulfate, sodium chloride and sodium nitrate and potassium sulfate mixed salt are concentrated and separated with a multi-effect negative pressure evaporation method; condensed water is recycled. The purity of separated sodium chloride and the purity of separated sodium sulfate are higher than 99%, and sodium chloride and sodium sulfate can be directly sold. The method has remarkable economic benefits and social benefits, is environment-friendly, comprehensively reaches the standard and can be used for comprehensive treatment and utilization of similar high-concentration saline water in other industries, so that the environment-friendly and energy-saving requirements for full utilization of resources are met.