2148 results about "Anaerobic treatment" patented technology

A method and process for the treatment of wastewater containing phosphorous and nitrogen. The wastewater is first anaerobically treated to produce an anaerobic effluent from which insoluble organic carbon is separated to form a sludge rich in organic carbon that is used as a substrate during anoxic treatment of the wastewater by de-nitrifying phosphorous accumulating organisms (DPAO's) and ordinary de-nitrifying organisms. The separation of insoluble organic carbon is normally conducted using a clarifier located intermediate the anaerobic and anoxic bio-reactors. In one embodiment, the ammonia rich clarifier supernatant is directed to an aerobic reactor for nitrification and the nitrate produced is recycled to the anoxic bio-reactor. The final effluent may be membrane filtered to retain nitrifying biomass within the aerobic bio-reactor. The invention reduces overall hydraulic residence time and sludge volume, which results in a smaller, less expensive wastewater treatment system.

The invention discloses a method for resource recovery and classification utilization of urban domestic wastes, which at least comprises the following steps of: a magnetic separation step, a waste cutting step, a elutriation flotation step, a waste extrusion dehydration step, an anaerobic treatment step and a sludge deposition concentration step; scrap iron is separated by the magnetic separationstep for the recovery and utilization of the scrap iron; anaerobic organic matter is crushed by the waste cutting step; pasty organic matter and block non-anaerobic wastes are thoroughly separated bythe elutriation flotation step so as to allow the pasty anaerobic organic matter to enter a biogas generation pool or tank for an anaerobic reaction and to allow the clean non-anaerobic wastes to be extruded, dehydrated and dried for individual treatment, and the waste decrement is above 90%; after elutriation, the left 10% non-anaerobic wastes are prepared into fuel oil by a cracking reaction; or are recycled through screening with no screening difficulty being caused by dust and organic matter containing in the wastes; or are delivered into a gasifier for fuel gas production, which preventsthe energy consumption of water-containing organic matter during waste incineration treatment, and greatly increases the thermal efficiency of waste treatment.

The invention provides a method and a system for treating a VOCs gas in a sewage treatment plant, and is based on a VOCs gas absorption-desorption system, a combustion and waste heat recycling system and a wastewater treatment system. The method comprises the following specific steps: feeding a low-concentration VOCs gas in the sewage treatment plant through the VOCs gas absorption-desorption system so as to obtain a concentrated VOCs gas; combining the concentrated VOCs gas with a high-concentration VOCs gas and gases output from an anaerobic treatment unit in the sewage treatment plant to be introduced into the combustion and waste heat recycling system; introducing a certain amount of fuel and a waste gas methane generated in the wastewater treatment system so as to sufficiently combust the VOCs gas; after combustion, recycling the heat by using a waste heat boiler, feeding a part of cleaned fume at an outlet to the VOCs gas absorption-desorption system to desorb the low-concentration VOCs gas, and combining the other part of the cleaned fume with tail gases of an absorption-desorption device to be fed into a chimney for discharge.

The invention discloses a method and a device for treating garbage percolate, wherein the method comprises the steps of pretreatment, anaerobic treatment, membrane biochemical treatment, nanofiltration treatment, sludge treatment and the like; the device comprises a primary sedimentation tank (1) and an adjusting tank (2), the adjusting tank (2) is connected with an anaerobic reactor (3), the anaerobic reactor (3) is connected with a denitrification tank (4), and the denitrification tank (4) is communicated with a nitrification tank (5); and the nitrification tank (5) is connected with an ultrafiltration apparatus (6), and the ultrafiltration apparatus (6) is connected with a nanofiltration device (7). The method and the device achieve COD degradation of high-concentration wastewater so that the COD of high-concentration COD of 50,000 reaches about 50 after treatment and reaches the standard of industrial reuse water, thus the method and the device achieve zero discharge of the percolate, initiate a new attempt to treat high-concentration percolate, and fill up the domestic blank.

The invention relates to a landfill percolate treatment novel process method, which comprises the following steps: (1) collecting and gathering the landfill percolate into a regulating tank; (2) lifting the outlet water of the regulating tank to enter an ammonia stripping reaction vessel; (3) carrying out coagulating sedimentation treatment on the landfill percolate after ammonia stripping; (4) making the outlet water of the coagulating sedimentation enter an anaerobic reaction vessel for carrying out anaerobic treatment; (5) sequentially making the outlet water of the anaerobic reaction vessel enter an anoxic tank, an aerobic tank and an MBR reaction tank, wherein mixed liquid carries out back flowing from the MBR reaction tank to the anoxic tank, a membrane assembly used in the MBR reaction vessel is a flat plate MBR film assembly, and the MBR has the form of the submerging form; and (6) making the outlet water of the MBR reaction tank enter a reverse osmosis system, directly discharging the treated outlet water, and making reverse osmosis concentrated solution flow back to the regulating tank. The invention aims at the water quality features of the landfill percolate, reasonably combines the physicochemical treatment and biological treatment unit, and has the advantages of short and compact process flow, high treatment efficiency, low energy consumption, long service life of the membrane assembly and the like.

The present invention is the anaerobic treatment, aerobic treatment and membrane treatment process of domestic garbage percolate, and belongs to the field of sewage treating technology. The combined treating process is completed in four units including a two-stage upwards flowing anaerobic sludge bed, an immobilized microbial biological aeration filter, a coagulating and settling pond and a nanometer filtering membrane. The present invention has the advantages of simultaneous elimination of carbon, nitrogen and other pollutants, high treating effect, high load impact resistance and high stability. The present invention may be also applied in treating other waste water with high ammonia nitrogen content, high organic pollutant concentration and great water quality fluctuation.

The invention belongs to the technical field of environment protection and particularly relates to a treatment process of organic wastewater containing high-concentration ammonia nitrogen, which is characterized by comprising the following steps: 1, carrying out pretreatment; 2, carrying out anaerobic treatment, and leading effluent from a coagulation/air floatation pool to an upflow anaerobic sludge blanket (UASB) reactor, wherein the hydraulic power stays for 40 to 120 hours; and 3, treating in a membrane bioreactor system. Through microanaerobic/aerobic environments on a surface layer, as well as the absorption by a microporous structure and biological oxidation action, various pollutants such as organic matters, nitrogen and phosphorus in the wastewater can be removed from wastewater of an ecological base flow, and when the ecological base flow is introduced to a membrane biological reactor (MBR) system, the impact resistance and treatment efficiency of the biological treatment unit can be improved.

Systems for treating water containing unwanted contaminants. More particularly, the present invention relates to waste water treatment systems including biological media used to aerobically or anaerobically treat solid and liquid waste in water for large and small-scale waste water systems in a way that minimizes the size of the system required to output high-quality, environmentally suitable water that is depleted of ammonia, nitrites, nitrates and other contaminants.

The city sewage treatment process includes the following steps: utilizing grile and desilting basin to pretreat sewage, adding coagulating agent to make the phosphorus, heavy metal and orgnaic matters existed as colloid and suspended substances feed into anaerobic reactor in the form of sludge to make organic matter convert into impure methane, making the supernatant fluid pass through the next aerobic treatment reactor to remove organic matter and convert the ammoniacal nitrogen into nitric nitrogen, mixing anaerobic discharged water and aerobic discharged water, and making the mixture waterundergo the process of anaerobic treatment to make denitrifcation, finally utilizing secondary aeration and precipitation to completely remove organic matters from sewage so as to attain the goal of cleaning the sewage.

The invention belongs to the technical field of wastewater treatment and relates to a new wastewater treatment technology which achieves decontamination and resource of wastewater by utilizing a biological-ecological compound treatment technology for purify and intensify the wastewater in a pig farm. The invention comprises the steps of: using a coarse and fine grid for implementing preliminary solid-liquid separation to the wastewater in a pig farm so as to remove part of the solids, later using a methane tank for implementing anaerobic processing and realizing the hydrolytic acidification of the wastewater, and generating clean energy for the use in farms and the surrounding farmers; implementing further removal of the particles in the wastewater by a sedimentation tank, a grid slot, and an inclined tube sedimentation tank, and then adopting a biological contact oxidation pond-anaerobic baffle plate biological film for implementing biological treatment to the wastewater so as to effectively remove the majority of pollutants in wastewater, and finally using a composite eco-pond for further treatment of the yielding water of the biological treatment section. The invention not only can achieve standard wastewater discharge, but also can create economic benefits by the aquatic economic plants in the pond and achieve water resource.

The invention is applicable to the technical field of wastewater treatment, and provides a method for treating leachate in a refuse landfill site. The method adopts processes of anaerobic treatment, biological aerated treatment, secondary AO treatment, MBR treatment and reverse osmosis treatment, and effluent of the treated leachate wastewater in the refuse landfill site meets the pollution control standard for domestic refuse landfill (GB 16889-2008). The method does not need to adopt blowoff treatment, saves running cost, and adopts a coagulating sedimentation method to treat concentrate after the reverse osmosis treatment so as to avoid accumulation of organic matters and heavy metals in the system.

A treatment method for high-concentration organic wastewater is characterized in that first electrodialysis desalination and concentration treatment is adopted and then a comprehensive method of biochemical treatment is adopted, wherein the electrodialysis desalination and concentration treatment is that treated recycle water flows back into an adjusting tank to dilute raw water and then enters an electrodialysis treatment device; and in the electrodialysis treatment device, inorganic salt is separated out, relatively ropy solid is filtered by an ultrafiltration membrane, the separated out inorganic salt can be used independently or enters a concentration tank together with the solid filtered by the ultrafiltration membrane to be heated, concentrated and dried to obtain an organic compound fertilizer product. Besides, desalted water with higher COD contend and BOD content is obtained through the electrodialysis and is subjected to anaerobic treatment and aerobic treatment in sequence; and when the COD contend and the BOD content of the obtained water meet the requirements, part of the obtained water is used as recycle water to dilute high-concentration organic wastewater, and the other part of the obtained water is discharged or used as cooling water for production.

The invention provides a process for treating high-concentration printing and dying waste water. The waste water treatment process comprises the following steps of: a, aerating and adsorbing active carbon; b, adjusting pH value and filtering; c, performing anaerobic treatment; d, performing aerobic treatment; e, de-coloring; f, performing secondary filtering; and g, treating with a membrane bio-reactor (MBR) film. The waste water treatment process has a compact process, is easy and convenient to operate, can be used for treating waste water with a slightly high chemical oxygen demand (COD) value and is a set of high-quality, high-efficiency and stable waste water treatment process; and treated water has high quality and can meet the requirement on recycling water for production.

A system for treating wastewater comprises a source of activated sludge, a compressor for supplying pressurized air, at least one anaerobic reactor for anaerobically treating wastewater with the activated sludge, at least one aerobic reactor for aerobically treating wastewater with the activated sludge and pressurized air, a pressure control system for regulating pressure in the system, a discharge system for removing byproducts of the system, and a discharge system for removing treated wastewater and activated sludge from an anaerobic and an aerobic reactor, and a surge tank for holding removed wastewater and activated sludge and thereby further treating the wastewater.

The invention discloses a process for reusing waste leachate and a device thereof. Which comprises a homogenization process stage, an anaerobic process stage, an aerobic process stage 1, an advance oxidization stage, an aerobic process stage 2 and a reverse osmosis desalination stage.The device comprises the following equipments connected in series by pipes in turn: a water regulating tank, a collecting well, an up-flow anaerobic sludge bed reactor, a reaction tank for continuous and interval aerating, an ozonation system, a membrane biological reactor, a middle tank in which a water pump is arranged, a reverse osmosis system in which a pump, a precise filter and reverse osmosis component are arranged as well as a clean water tank.The beneficial effects of the invention lie in that: a plurality of organic matters which are difficult to degrade can be effectively resolved; a whole set of processes such as the anaerobic process, the aerobic process, the advance oxidization process and the microfiltration are used as pretreatments of the reverse osmosis(RO) system and the water quality index fully meets the water quality requirements of the reverse osmosis system. The last desalination is carried out by using reverse osmosis system to ensure the water quality index reused by the leachate.

A process is provided for increasing the production of PHA in a mixed culture biomass. In a first stage of the process, organic material associated with a substrate is converted to volatile fatty acids. In the case of a wastewater treatment process, if the wastewater includes sufficient volatile fatty acids (VFAs) to support the process, then it is unnecessary to convert organic material to VFAs. In a second stage of the process, an anaerobic-aerobic selection process is utilized to select glycogen accumulating organisms that cause these organisms to proliferate and dominate the open mixed culture biomass. By providing relatively high organic loading in the form of VFAs in the anaerobic treatment phase of the selection process, glycogen accumulating organisms having a relatively high level of stored glycogen are produced. In a third stage, the PHA accumulation process is practiced where the glycogen rich organisms are fed VFAs under anaerobic or aerobic conditions or combinations thereof. Through the consumption of externally supplied VFAs and internally stored glycogen, relatively high levels of PHA in the biomass are produced. Thereafter PHA is separated from the residual biomass.

The present invention discloses an acidic high sulfate organic wastewater treatment process and apparatus. The present invention belongs to the technical field of wastewater treatment. The specific process comprises the steps of: (1) neutralization and precipitation treatment: using lime milk to adjust PH of wastewater, and forming CaSO4 precipitation separated from the water; (2) first-stage anaerobic treatment, entering the first-stage anaerobic treatment after neutralization and precipitation treatment, introducing nitrogen into the bottom of an anaerobic reactor with stirring and blowing off, parsing H2S from an aqueous phase into a gas phase above a liquid level, introducing the H2S in the gas phase to a dry desulfurizer for desulfurization, and re-introducing the sulfur removed nitrogen into the first-stage anaerobic reactor for recycling through a blower; and (3) second-stage anaerobic treatment, introducing the sulfur removed wastewater into a second-stage anaerobic reactor to complete an anaerobic methane production reaction, and taking second-stage anaerobic effluent into an aerobic reaction tank for further processing. According to treatment process disclosed by the present invention, inhibition and toxic effects generated by the SO42- and S2- to the anaerobic biological treatment can be effectively reduced, and sewage treatment effects can be improved.

The invention relates to a phosphor recovery crystallization reactor and a phosphor recovery method. The reactor is in inner-outer dual barrel structure, wherein the inner barrel is disposed at the center position of the outer barrel. The reactor includes an aeration stripping area, a crystallization reaction area, a precipitation separation area, a high concentration phosphor mud area and a buffering area, wherein the crystallization reaction area communicates with the precipitation separation area through the upper portion of the buffering area, so that the sewage water after the crystallization reaction in the crystallization reaction area flows into a precipitation separation area without affecting the high concentration phosphor mud area. The invention fully utilizes effective ingredients in the anaerobic treated water of the high concentration waste water of domestic animal and poultry, enhances pH value of the anaerobic treated water by aeration stripping, removes phosphor in the form of crystal of ammoniomagnesium phosphate using relatively high concentration of phosphor and ammonian in the waste water of domestic animal and poultry. The total removal rate of the phosphor can reach 50-60% without any chemical agents added. Phosphor is recovered in form of crystals, which is beneficial to utilization of the recovered phosphor.

The invention relates to a technology for treating waste water produced by rubber accelerator production. The technology comprises the following steps of 1, adjusting quality and an amount of waste water produced by rubber accelerator production, adjusting pH value of the waste water to 11-13, adjusting a temperature of the waste water to 60-90 DEG C, and carrying out stirring for 2-4h for alkaline hydrolysis, 2, adjusting a pH value of the waste water to 5.0-6.0 by sulfuric acid, and carrying out evaporation desalination, 3, carrying out anaerobic treatment on the waste water subjected to evaporation desalination, 4, orderly carrying out anaerobic treatment, aerobic treatment and secondary precipitation of the anaerobic precipitation product water, wherein a mixed solution and sludge backflow process is carried out between the secondary precipitation and the anaerobic treatment, and 5, orderly carrying out Fenton catalytic oxidation, coagulating sedimentation and filtration deep treatment on the secondary precipitation product water. According to the characteristic of quality and amount of waste water produced by rubber accelerator production, the technology combines a physicochemical treatment method and a biochemical treatment method, realizes that COD and ammonia nitrogen indexes of waste water stably reach corresponding emission standards, has a compact process, is convenient for operation, has low energy consumption and strong practicality, and can be industrialized easily. The waste water treated deeply can be used as recycled water so that waste water recycle is realized.

The invention discloses garbage leachate treatment process, which comprises the following process steps of: (1) filtering garbage leachate with a fine grid and allowing obtained liquid part to enter a coagulating sedimentation tank; (2) adding a coagulant into the coagulating sedimentation tank, separating precipitate with stirring, and allowing obtained supernate to enter an adjusting tank; (3) adjusting the supernate obtained by step (2) in the adjusting tank until the pH value is neutral; (4) pumping the obtained neutral supernate obtained by step (3) into an upflow anaerobic sludge blanket for treatment by using an anaerobic recycle pump, and allowing effluent obtained after the anaerobic treatment to enter a denitrification tank and a nitrification tank for denitrification and nitrification treatment and then enter an ultrafiltration device for ultrafiltration; (5) bio-chemically modifying the ultrafiltrated effluent by ozone; and (6) performing secondary biochemical treatment on the modified water and then directly draining the processed water after the secondary biochemical treatment. The garbage leachate treatment process has the advantages of high efficiency, low energy consumption and easy operation and management.

The invention discloses a biological nitrogen removal method based on anaerobic Feammox and application thereof. The biological nitrogen removal method comprises the following steps that sludge containing Feammox microorganisms is added into an anaerobic reactor, ammonia containing wastewater is led into the reactor, NH4 + in the Fe (III) NTA oxidized wastewater is utilized to generate NO2-, and then nitrogen treatment is performed. The biological nitrogen removal method comprises the specific steps that 1, the Feammox enriched microorganisms are cultivated: the sludge is pretreated and the Feammox microorganisms are cultivated; 2, the Feammox microorganisms are utilized to perform wastewater treatment; 3, nitrogen removal treatment is performed by using the liquid collected after anaerobic Feammox treatment. The method has the advantages of lower power consumption, few carbon source demands, less greenhouse gas emissions, less produced NO3- and the like, is lower in investment and operating costs and wide in application prospect.

The invention discloses a treatment method of domestic landfill leachate, the treatment method comprises the following steps: the landfill leachate is fully regulated in a regulation tank and then carries out the pre-treatment step; part of ammonia stripping is firstly carried out, then the anaerobic treatment and the aerobic treatment are carried out; sewage after the aerobic treatment enters into an MBR membrane biological reaction tank; the sewage is carried out the MBR membrane treatment in the MBR membrane biological reaction tank; the outlet water after the MBR membrane treatment is carried out the deep treatment (ultrafiltration, nanofiltration); the clean water enters into a discharge tank to carry out the qualified discharge; the nanofiltration concentrated water enters into an ozone contact tank; the concentrated water carries out the ozone oxidation reaction in the ozone contact tank; and the water after the ozone oxidation reaction enters into the discharge tank to carry out the qualified discharge. As the concentrated water is further carried out the ozone oxidation reaction after the deep treatment, organic matters are degraded through the antivirus, the fading and other oxidation roles of the ozone, thereby leading the water after the treatment to achieve the qualified discharge.