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2257 results about "Activated sludge" patented technology

The activated sludge process is a type of wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa. The general arrangement of an activated sludge process for removing carbonaceous pollution includes the following items: An aeration tank where air (or oxygen) is injected in the mixed liquor. This is followed by a settling tank (usually referred to as "final clarifier" or "secondary settling tank") to allow the biological flocs (the sludge blanket) to settle, thus separating the biological sludge from the clear treated water.

Aqueous compositions, aqueous cutting fluid using the same, method for preparation thereof, and cutting method using the cutting fluid

An aqueous cutting fluid which can reduce the impact on working environment and the global environment, and can achieve both preventing precipitates from becoming a hard cake and keeping high dispersibility for abrasive grains is provided. Such an aqueous cutting fluid is obtained by a method comprising dispersing abrasive grains (G) in an aqueous composition comprising a dispersion medium (M) containing a hydrophilic alcohol compound such as ethylene glycol, a lipophilic alcohol compound such as propylene glycol and water, and silica colloid particles dispersed stably in the medium. The dispersion medium (M) is odorless and not flammable. The abrasive grains (G) may settle out after a time, but they do not closely contact with one another, and therefore the resulting precipitates do not become a hard cake, which allows the re-dispersion and reuse of precipitated grains. The instant aqueous cutting fluid is inherently low viscous, and the reduction of viscosity owing to the contamination of water and the increase of viscosity owing to contamination of shavings are both moderate. As a result, the cutting fluid has a long life. And articles which have been cut using the cutting fluid can be washed with water. Further, as the dispersion medium (M) is a biodegradable low molecular weight organic compound, a waste liquid from a process using the cutting fluid can be disposed with an activated sludge.

Wastewater treatment process

A wastewater treatment process providing nitrogen, phosphorus, biochemical oxygen demand (BOD) and suspended solids removal comprises the steps of: passing wastewater containing ammonia nitrogen, phosphate, BOD and suspended solids, said wastewater mixed with recycled activated sludge from a subsequent step, into a first anoxic zone therein reducing nitrate nitrogen from the recycled sludge to molecular nitrogen; passing effluent from the first anoxic zone to a first aerobic zone therein oxidizing at least a portion of the BOD and oxidizing at least a portion of the ammonia nitrogen to nitrate nitrogen; recycling a portion of the contents at the end of the first aerobic zone back to the first anoxic zone; passing the effluent of the first aerobic zone to a second anoxic zone; introducing volatile fatty acid such as acetic acid into the second anoxic zone therein releasing phosphorus into a liquid phase; passing effluent from the second anoxic zone including the volatile fatty acid to a second aerobic zone therein substantially absorbing phosphorus into biomass and removing and/or oxidizing ammonia nitrogen; passing effluent from the second anoxic zone to a final settling zone therein separating: (i) a purified wastewater having decreased nitrogen, phosphorus, BOD and suspended solids and (ii) a sludge containing suspended solids, phosphate and BOD; and recycling at least a portion of the sludge (ii) to the first anoxic zone. In another embodiment, at least a portion of the sludge (ii) is also recycled to the second anoxic zone. In yet another embodiment, the second anoxic zone is divided into a first section and a second section. In the first section, anoxic conditions are established and in the second section, volatile fatty acid is added after anoxic conditions have been established.

Method and apparatus for treating oil refining sewerage

The invention relates to a treatment method and a device for refinery sewage. The refinery sewage is sent into an electrolytic catalysis oxidation reactor which is provided with an anode, a cathode and solid catalyst particles, wherein, the lower part of the reactor is provided with an oxygenation aeration device, the solid catalyst particles are filled between the anode and the cathode, and the solid catalyst particles adopts particle activated carbon loaded with metals having catalytic and oxidation function. The effluent of the electrolytic catalysis oxidation can be further treated by adopting an activated sludge process. The method is used for treating high-concentration salt-containing mixed wastewater such as the draining water of a refinery electrical desalting unit, the alkali washing waste alkali liquid of oils, liquefied petroleum gas and dry gas, and cutting water in an oils tank farm, and the like, the wastewater after treatment satisfies the requirement of direct discharging, thus alleviating impact on a wastewater treatment plant. The method put forward by the invention has the advantages that high-concentration wastewater can reach disposable treatment standard and does not need any dilution biochemical treatment, treatment effluent is not polluted secondarily by metal ions, and investment and running cost are lower, and the like.

Liquid-solid circulating fluidized bed waste water treatment system for simultaneous carbon, nitrogen and phosphorus removal

Biological nutrient removal (BNR) in municipal wastewater treatment to remove carbonaceous substrates, nutrients and phosphorus, has recently become increasingly popular worldwide due to increasingly stringent regulations. Biological fluidized bed (BFB) technology, which could be potentially used for BNR processes, can provide some advantages such as high efficiency and compact structure. This present invention incorporates the fixed-film biological fluidized bed technology with the biological nutrient removal in a liquid-solid circulating fluidized bed, which has achieved the simultaneous elimination of organic carbon, nitrogen and phosphorus, in a very efficient manner and with very compact space requirements. The BNR-LSCFB has two fluidized beds, running as anoxic/anaerobic and aerobic processes to accomplish simultaneous nitrification and denitrification and to remove carbonaceous substrates, nutrients and phosphorus, with continuous liquid and solids recirculation through the anoxic/anaerobic bed and the aerobic bed. The new BNR-LSCFB system is not only an excellent alternative for conventional activated sludge type BNR technologies but is also capable of processing much higher loadings and suitable for industrial applications.

Novel process for treating coking waste water by charging activated sludge process

The utility model discloses a technology for treating coking wastewater by using a novel feeding activated sludge method, which comprises the following steps: biochemical treatment process is carried out on the pretreated wastewater, the coking wastewater first enters an A-grade biochemical pond to provide carbon sources for denitrification, and then the coking wastewater enters a 0-grade biochemical pond for carrying out oxidation and nitration under aerobic environment, the effluent water of the 0-grade biochemical pond enters a secondary sedimentation tank; the supernatant from the secondary sedimentation tank enters a subsequent-stage treatment system and one part of settling sludge refluxes and enters the A-grade biochemical pond and 0-grade biochemical pond; the other part of the settling sludge enters a sludge thickener. As flocculants are added into the biochemical pond, the ability of tolerating loads is greatly improved, and shock resistance is also greatly enhanced; the area of the biochemical reaction pond is reduced to 70 percent of the area of the reaction pond of traditional feeding activated sludge method, so investment costs are saved and operation costs are decreased; while the decolorizing ratio of the technology to coking wastewater, black liquor and chloromycetin wastewater can reach to more than 80 percent.

Method for innocent treatment of bottom oil sludge, scruff and active sludge in petro-chemical industry

The invention discloses a method of harmless treatment to residual activated sludge produced by bottom sludge, scum and biochemical treatment units in the petrochemical industry, which comprises: emulsion breaking to the bottom sludge and scum; separation of oil, water and mud of products after emulsion breaking; and recovery of dirty oil at the upper part and sedimentation of mud-water mixture at the lower part, recovery of clear liquor at the upper part, and treatment of coagulation conditioning, flocculation conditioning, sludge concentration, sludge dewatering, sludge drying and sludge incineration to mud-water mixture at the bottom part and the residual activated sludge sequentially. The method can effectively recycle useful oil substances and aluminum-containing compounds in the bottom sludge and scum, purify possibly released malodorous gases in mud produced in the process of storage and disposal, and carry out the treatment such as sludge conditioning, dewatering and drying sequentially to the residual mass hazardous wastes after the recycling treatment, then utilize the current boilers in enterprises to implement the direct incineration treatment. The method has advantages of simple operation and running, safety and reliability, complete resource recovery, controllable water removal, and maximally reducing the environmental pollution.

Process and device for treating sewage through denitrification and dephosphorization by anaerobic-anoxic-oxic-anoxic (AAOA) plus membrane bioreactor (MBR) process

The invention belongs to the technical field of the treatment of municipal sewage, and discloses a process and a device for treating sewage through denitrification and dephosphorization by an anaerobic-anoxic-oxic-anoxic (AAOA) plus membrane bioreactor (MBR) process. A rear anoxic tank is arranged on the basis of the traditional anaerobic-anoxic-oxic (A<2>/O) process flow; meanwhile, a membrane separation technology is used for substituting two sedimentation units of sedimentation tanks; according to the process, pre-treated sewage flows into an anaerobic tank, an anoxic tank and the rear anoxic tank respectively; and the sewage flows into an MBR tank through the anaerobic tank, the anoxic tank, an aerobic tank and the rear anoxic tank, is filtered by an MBR membrane component and is drained. By the process for treating the sewage, a carbon source in the sewage can be efficiently utilized by arranging the rear anoxic tank and changing influent and reflux modes, so that the denitrification and dephosphorization efficiency of the sewage is improved; and meanwhile, the membrane separation technology is used for increasing the concentration of activated sludge in the process for treating the sewage so as to realize the high-efficiency separation of mud and water in the sewage, so that the problems that the conventional process for treating the sewage is high in energy consumption, the floor area is large, and pollutants such as nitrogen, phosphorus and the like cannot be efficiently removed are solved. The water quality of effluent treated by the method meets the requirements of I-class A criteria of Integrated Wastewater Discharge Standard (GB 8978-1996).

Enrichment culture method of salt-tolerant nitrifying bacterium communities

The invention discloses an enrichment culture method of salt-tolerant nitrifying bacterium communities, which comprises the steps that: activated sludge is inoculated, and the culture mode is the sequencing batch type enrichment culture; the enrichment culture is carried out in simulated wastewater, the main ingredient of nutritive salt of the enrichment culture is inorganic salt, the substrate is externally added ammonium salt, and a carbon source is inorganic carbonate; the pH value in an aeration tank in the enrichment culture process is regulated and controlled through sodium carbonate and sodium bicarbonate, and the dissolved oxygen value is regulated through the aeration quantity; a method for gradually increasing the salinity is adopted for domesticating the nitrifying bacterium communities; and when no filamentous bacterium is observed in the sludge and the number and the variety of protozoans are few, the enrichment culture of the nitrifying bacterium communities is finished. The enrichment culture method has the advantages that the available matrix range is wide, the culture is easy, the concentration of the cultured salt-tolerant nitrifying bacterium communities is high, the activity is good, the biochemical treatment removal rate of high-salt ammonia-nitrogen wastewater can be obviously improved, the enrichment culture method is suitable for the treatment of various ammonia-nitrogen industrial wastewater and is suitable for the scale production, the wastewater treatment cost is reduced, and good economic benefits and environmental benefits are realized.

Method for biologically purifying municipal sewage and recovering resources

The invention discloses a method for biologically purifying municipal sewage and recovering useful resources. The method comprises the following steps of: 1) discharging excess sludge into a sludge activation tank to perform aerobic aeration; 2) discharging the activated sludge and the raw sewage into a sludge adsorption tank to perform aerobic aeration; 3) precipitating sludge-water mixed solution in a precipitation tank, putting supernatant into a sewage treatment system, purifying the supernatant, then discharging the sewage, and purifying the excess sludge circularly; 4) mixing the sludge at the bottom of the precipitation tank with the sludge in an anaerobic digestion tank to perform anaerobic fermentation; 5) converting an organic substance after the anaerobic fermentation into methane gas and recovering the methane gas; 6) discharging the supernatant into a crystallizing pond, adding a magnesium salt into the crystallizing pond, adjusting the pH value to ensure that the mixture is turned into guanite deposit, and recovering the guanite deposit; 7) putting the supernatant in the crystallizing pond into the sewage treatment system; and 8) discharging the excess sludge after the anaerobic fermentation. By using the excess sludge to treat the municipal sewage, the method not only solves the problems in sewage purification, makes use of pollutants in the sewage, but also realizes sludge disposal and extracts effective resources in the sewage.

Method for preparing hydrogen with biology and with utilization of organic waste water step

The invention discloses a method of hydrogen production of biological cascade utilization on organic wastewater and relates to a method of producing hydrogen. The invention solves the existing problem of low conversion on biological hydrogen production with organic wastewater fermentation by using anaerobic activated sludge. The hydrogen production method of the invention is carried out as follows: firstly an anode chamber is in the anaerobic condition during startup procedure, anaerobic activated sludge is put into the anode chamber, the nutrient solution with pH value of 6.8 to 7.0 is introduced into the anode chamber, phosphate buffer is added into a cathode chamber, aeration is carried out in the cathode chamber in the previous 28 to 35 days of the startup procedure, startup is successful till the output voltage is continuously and steadily over 400 mV; secondly the organic wastewater is filled into the anode chamber from an inlet of the anode chamber and the organic wastewater is processed in the anode chamber, consequently hydrogen is obtained in the cathode chamber. The coulombic efficiency of the organic substrate conversion of the method reaches as high as over 80 percent, the electron transfer efficiency of transferring the cathode electron into hydrogen approaches to 100 percent, the purity of the hydrogen obtained in the cathode chamber in the entire process reaches 99.5 percent, the energy conversion efficiency of the entire process reaches over 80 percent, and the hydrogen yield calculated based on the input voltage is 288 percent.

Pollution abatement method for livestock and poultry farm

The invention discloses a pollution abatement method for a livestock and poultry farm. The method comprises the following steps of: separating feces from fence washing water and rain water at the source; carrying out solid-liquid separation on the feces and the sludge generated in each treatment procedure; conveying the separated liquid part to a plug flow anaerobic fermentation reactor or a liquid high-temperature aerobic fermentation reactor for liquid biological treatment, carrying out aerobic fermentation and filtration to get a liquid organic fertilizer; and conveying the separated solid part to a high temperature aerobic fermentation device, after fermentation, aging and deeply processing the solid part to get a solid organic fertilizer. Bad smell is exhausted after being processed in a biological deodorization filtering tower, and the filter material replaced from the biological deodorization filtering tower is considered as carbon source and conveyed to the solid aerobic fermentation device so as to be treated. Firstly, the fence washing water is treated by a grid impurity removal facility, after being treated by an SBR (Sequencing Batch Reactor Activated Sludge Process) biological reactor and medicated for flocculation and sedimentation, the fence washing water is drained after being purified by a wet land, or drained after being treated by aerobic fermentation reaction and filtering, and the sedimentary sludge and the solid substances under the grid fence are conveyed into a solid-liquid separation procedure so as to be treated. The method can be used for managing or beneficially using all the pollutants, and contributing the effort for establishing the resource-saving and environmentally-friendly society.
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