25results about How to "Promote denitrification" patented technology

The invention discloses a method for enhancing nitrogen and phosphorus removal effects of a whole-course autotrophic nitrogen removal system, and belongs to the technical field of sewage treatment. According to the method, the steel slag powder and the steel slag particles are applied to a nitrification section and a sulfur autotrophic denitrification section respectively, alkalinity consumed by nitrification is supplemented by adding the steel slag powder in the nitrification section, enrichment of nitrifying bacteria is facilitated, metal ions leached from the steel slag powder improve the ammonia nitrogen removal rate, meanwhile, part of phosphate is removed, and the ammonia nitrogen removal rate is increased. The average removal rate of ammonia nitrogen is 99.75%, and the average removal rate of phosphate is 23.22%. According to the invention, the denitrification potential and denitrification effect of the sulfur autotrophic denitrification section are improved, and when the HRT is 3h, the average 97.04% of total nitrogen and the average 86.4% of total phosphorus can be removed; in the denitrification process, metal ions leached from the steel slag can generate precipitates with phosphate, and H < + > generated in the denitrification process can accelerate erosion of the steel slag, so that the phosphorus removal capacity of the steel slag is improved.

The invention discloses a method for preparing a core-shell structure phase hydrorefining catalyst, comprising the following contents: (1) gelling, aging and filtering a first precipitant, a sodium molybdate solution and a solution containing Ni and Si to obtain a filter cake of a first slurry, and then treating it with a mixed aqueous solution of aluminum salt and organic alcohol to obtain a mixed slurry; (2) adding a Ni-containing solution, a sodium tungstate solution, a second precipitant and the mixed slurry obtained in step (1) to a reactor containing water and an oily liquid to gel and age them to generate a second slurry; (3) filtering, drying and molding the slurry to obtain a molded product; (4) soaking the molded product in an organic acid solution, and desalting the soaked molded product to obtain a catalyst. The preparation process of the method is clean and pollution-free, and the prepared catalyst has a core-shell structure, a large pore volume and a large pore size, and is used in processes such as distillate hydrodesulfurization and denitrogenation, and has high hydrodesulfurization and hydrodenitrogenation reaction performance.

The invention relates to the technical field of catalysts, in particular to a preparation method, a product and application of a low-temperature anti-poisoning composite Mn-based catalyst. The preparation method of the low-temperature anti-poisoning composite Mn-based catalyst comprises the following steps: dissolving precursor substances respectively containing L, Mn and N in water to obtain a homogeneous solution; adding the homogeneous solution into the Si source solution, controlling the pH value of a reaction system to be alkaline, and aging; and carrying out suction filtration and washing on the aged mixed solution, and then drying and calcining to obtain the low-temperature anti-poisoning composite Mn-based catalyst. L is at least one of Cu, Ni and Co; n is Al and / or Fe. The low-temperature anti-poisoning composite Mn-based catalyst prepared by using the method disclosed by the invention not only can efficiently catalyze and reduce nitrogen oxides in flue gas at low temperature, but also has very good low-temperature anti-poisoning performance.

The invention relates to the technical field of sewage treatment, in particular to a system for efficiently treating livestock and poultry breeding sewage by utilizing algal-bacterial symbiosis, which comprises a solid-liquid separation module arranged on the ground, the solid-liquid separation module comprises a water inlet pipe, a separation box and a filter basket, a nitrification and denitrification tank is arranged on the top of the ground, and a stirring assembly is arranged in the nitrification and denitrification tank; the chemical phosphorus removal module comprises a coagulation, flocculation and sedimentation tank and a stirring assembly, the coagulation, flocculation and sedimentation tank is arranged on the ground, and the stirring assembly is arranged in a coagulation and flocculation area in the coagulation, flocculation and sedimentation tank; according to the system for efficiently treating the livestock and poultry breeding sewage by utilizing the bacterial-algae symbiosis, compared with an existing method for removing the total nitrogen content in the sewage by independently utilizing microorganisms, pollutants in the sewage are synergistically removed in the oxidation pond by utilizing a bacterial-algae symbiosis structure, microalgae and bacteria, so that the energy consumption and the carbon source are saved, and the environmental pollution is reduced. Meanwhile, the sewage treatment effect is improved.

The invention discloses a double-biological-membrane sewage treatment process for deep nitrogen and phosphorus removal coupled sludge reduction, and belongs to the technical field of sewage treatment. The process is composed of an anoxic biofilm reaction tank, an aerobic biofilm reaction tank and an iron autotrophic denitrification biofilter, and efficient nitrogen and phosphorus removal is performed on sewage through the double-biofilm sewage treatment process. Nitrogen and phosphorus removal and sludge in-situ reduction are mainly carried out in the front-end biological membrane reaction tank, and deep nitrogen and phosphorus removal is mainly carried out in the iron autotrophic denitrification biological filter tank. And the residual sludge is predded by using a protozoon / metazoon food chain of the aerobic biological membrane reaction tank, so that the effect of zero generation of the residual sludge is achieved. The concentration of iron ions is changed by adjusting the reflux ratio of iron-ion-containing reflux liquid generated by the iron autotrophic denitrification biofilter, so that the number and community structures of micro-organisms are effectively controlled, the control on sludge predation is further achieved, and the sludge reduction effect is improved. The process is obvious in effect, can stably operate for a long time and is suitable for engineering application.

The invention relates to a high-temperature denitration method based on a RTO system under a complex working condition. The method comprises the following steps: feeding waste gas into a lower-layer heat accumulator of a heat accumulation chamber under a gas inlet working condition through a waste gas inlet valve for primary preheating; the waste gas subjected to primary preheating is fed into a denitration reducing agent dynamic mixing chamber, and is uniformly distributed and uniformly flows with a denitration agent in the mixing chamber; feeding the waste gas subjected to uniform distribution and flow of the denitration agent into an upper-layer heat accumulator for secondary preheating; the waste gas is subjected to oxygenolysis of VOCs in the combustion chamber and high-temperature denitration reaction of nitrogen oxides generated by oxidizing nitrogen-containing organic matters and a denitration agent. By arranging the denitration agent pre-gasification chamber and arranging the denitration reducing agent dynamic mixing chamber in the RTO furnace heat storage chamber, the reaction retention time of a reducing agent and waste gas in a high-temperature area is prolonged, the incomplete reaction of the reducing agent entering a smoke discharging and cooling stage along with smoke due to the fact that the reducing agent is directly added into a combustion chamber is solved, the denitration reaction efficiency is improved, and the energy consumption is reduced. The usage amount of a denitration reducing agent is reduced, and the problem that traditional SCR is high in energy consumption is solved.

The invention provides a sewage treatment process with multiple operation modes and a sewage treatment system, and belongs to the technical field of sewage treatment. Comprising a first reaction zone, a second reaction zone and a third reaction zone which are used for sewage denitrification and / or dephosphorization and are carried out in sequence, and nitrification liquid treated in the third reaction zone flows back to the first reaction zone; switching among a dephosphorization priority mode, a dephosphorization and denitrification balance mode or a denitrification priority mode is carried out by controlling a nitrification liquid reflux ratio to adjust ORP (oxidation reduction potential) and / or DO (dissolved oxygen) of the first reaction zone. According to the sewage treatment process with the multiple operation modes, different operation modes can be flexibly adjusted and switched in the same sewage treatment system according to different incoming water qualities, extremely high biological denitrification and / or biological phosphorus removal efficiency can be obtained by controlling the reflux ratio of nitrification liquid to adjust ORP and / or DO, and the investment and treatment cost can also be greatly reduced.

The invention relates to the field of microbial technology, and discloses a strain with low-temperature resistance and aerobic denitrification function and an application thereof. The strain is named Pseudomonas sp. BWFA71, and the preservation unit is Guangdong Microbial Culture Collection Center (GDMCC), the preservation date is February 22, 2022, and the preservation number is GDMCCNO:62257. The strain of the invention has strong applicability and a wide range of temperature tolerance. The maximum and minimum tolerance temperatures are both wider than those of the same genus strains in the prior art. The strain can have good denitrification ability under conditions of 6 to 30°C, and the dissolved oxygen in the water has no obvious effect on its denitrification process. The strain is particularly suitable for sewage treatment and denitrification systems in areas with relatively large temperature changes, and for total nitrogen control in ecological restoration projects such as aquaculture water bodies and landscape water bodies where anaerobic denitrification cannot be performed.

The invention discloses an anaerobic denitrifying bacterial agent as well as a preparation method and application thereof, and belongs to the technical field of water environment treatment. The anaerobic denitrifying bacterium agent is prepared from the following components in parts by weight: 15 to 30 parts of sterile water, 15 to 60 parts of normal saline, 5 to 10 parts of micro-capsule embedded anaerobic denitrifying bacteria, 5 to 20 parts of a porous composite modified carrier, 10 to 30 parts of a carbon source, 4 to 7 parts of nutrient elements, 2.5 to 4 parts of a buffering agent and 1 to 5 parts of a stabilizer, the micro-capsule embedded anaerobic denitrifying bacteria are obtained by embedding anaerobic denitrifying bacteria with an alginic acid gel solution and a calcium chloride solution; the porous composite modified carrier is obtained by crosslinking modified nano iron oxide, modified nano titanium dioxide, a functional polymer solution and glutaraldehyde. The anaerobic denitrifying bacterial agent provided by the invention can effectively improve the efficiency of treating nitrogen pollution of a water body.

The invention provides a method for treating nitrate wastewater through a three-dimensional electrode biological membrane, and belongs to the technical field of nitrate wastewater treatment. The method comprises the following steps: constructing a cylindrical three-dimensional electrode method bio-membrane reactor by taking activated carbon as a substrate, taking a cylindrical shape enclosed by a plurality of graphite rods as a cathode and taking a middle graphite rod as an anode; the reactor cathode generates H2 under the action of impressed current, autotrophic hydrogen type denitrifying bacteria grow and breed depending on H2 and are attached to the surface of a cathode graphite rod to form a biological membrane, nitrate nitrogen in water can be diffused into the biological membrane, and the biological membrane on the surface of the cathode graphite rod utilizes the generated H2 to reduce the nitrate nitrogen; cO2 is generated at the anode of the reactor and is further converted into carbonic acid, bicarbonate radicals and carbonate radicals, and a carbon source required by growth and reproduction is provided for the autotrophic hydrogen type denitrifying bacteria. According to the three-dimensional electrode bio-membrane reactor, a filling material is added in a two-dimensional reactor structure to serve as a supplementary electrode, and stronger wastewater treatment capacity is brought by a larger surface area.

The utility model discloses a kind of gradient porosity MABR membrane silk assembly structures, including tube sheet, the bottom of the tube sheet is fixedly installed with hydrophobic layer, the inner wall of the hydrophobic layer is fixedly attached with vertical support layer, the hydrophobic layer and vertical support layer are all perforated with air hole, the inside of the vertical support layer is perforated with through hole, the diameter of the straight hole of the one end of tube sheet close to through hole is larger by being set, the one end of tube sheet is gas inlet end, so the gas pressure of the one end of tube sheet close is smaller, the diameter of the through hole of far away gas inlet end is smaller, so the passage cross-sectional area of the one end of tube sheet close is reduced, gas compression leads to gas pressure greater than gas inlet end, so the oxygen content dissolved into external water in unit time will rise, compensate terminal biofilm due to biofilm thickening leads to dissolved oxygen content low Problem, the air hole density of gas outlet end is larger, enhance the oxygen diffusion capacity of terminal, compensate oxygen transfer attenuation due to biofilm thickening, avoid terminal anoxia, promote outer layer denitrifying bacteria enrichment.

The present invention discloses a bulk hydrorefining catalyst and a preparation method thereof. The bulk hydrorefining catalyst of the present invention has a core phase of an amorphous composite oxide containing molybdenum, nickel and silicon, and a shell phase of an amorphous composite oxide containing tungsten, nickel and aluminum. The preparation method is as follows: (1) a first precipitant, a sodium molybdate solution and a solution containing Ni and Si are subjected to a first gelling reaction and a first aging to obtain a first slurry containing Ni, Si and Mo; (2) water and an oily liquid are added to a reactor, and then a solution containing Ni and Al, a sodium tungstate solution, a second precipitant and the first slurry are subjected to a second gelling reaction and a second aging to generate a second slurry; (3) the second slurry is aged and molded; (4) the molded product is subjected to a desalting treatment to obtain a catalyst. The catalyst prepared by the present invention has a large pore volume and pore diameter, has a high hydrodesulfurization and hydrodenitrogenation reaction performance, can avoid excessive cracking of diesel fractions, and has good raw material adaptability, and can process inferior distillate oil raw materials.

The invention provides a flue gas denitration purification system for an alkali recovery boiler in the papermaking industry, and relates to the technical field of denitration. The flue gas denitration purification system comprises a denitration tower and a compressed air component. The denitration tower comprises an inlet, a reaction part and an outlet. The outlet is connected to the bottom end of the reaction part, and the inlet is connected to the top end of the reaction part. An air outlet hood which is hollow inside and open at both ends is arranged in the inlet. The outer wall of the air outlet hood and the inner wall of the inlet together form a receiving groove which is closed at the bottom and open at the top. A centrifugal component is rotatably connected to the top of the air outlet hood. The compressed air component delivers compressed air to the inlet to drive the centrifugal component to rotate. The rotating centrifugal component drives the flue gas passing therethrough to rotate, and throws the sticky substances in the flue gas into the receiving groove. By arranging the centrifugal component in the inlet, the continuously rotating centrifugal component throws the sticky substances adsorbed on the surface of the centrifugal component into the receiving groove, and avoids the sticky substances from being adsorbed on the catalyst in large quantities.

The invention relates to the technical field of rural sewage and organic chemical engineering sewage treatment, in particular to a rural sewage and organic chemical engineering sewage comprehensive treatment method which comprises the following steps: pretreating rural sewage and organic chemical engineering sewage by using an aerated grit chamber; the rural sewage and the organic chemical sewage treated by the aerated grit chamber enter a grating tank to be treated; the rural sewage and the organic chemical sewage treated by the grating tank sequentially enter an anaerobic tank, an anoxic tank and an aerobic tank to be treated; the rural sewage and the organic chemical sewage treated by the aerobic tank enter a membrane bioreactor to be treated; the rural sewage and the organic chemical sewage treated by the membrane bioreactor enter the reverse osmosis mechanism to be treated. According to the invention, the sewage treatment efficiency is improved, efficient purification and resource utilization of sewage are realized by reducing pollutant discharge, natural water is protected from being polluted, and virtuous circle of ecological environment is promoted.

The invention provides an electric arc furnace bottom blowing oxygen-containing multi-element gas clean smelting method, and relates to the field of metallurgy. The method comprises the following steps: starting smelting, inputting a standard safe pressure value Pf into a main control system, and inputting a standard safe temperature value Tf into the main control system; when the temperature T of the molten pool is smaller than 1500 DEG C, the electric arc furnace is subjected to bottom blowing through argon; and when the temperature T of the molten pool is larger than or equal to 1500 DEG C, argon and oxygen-containing gas including oxygen and carbon dioxide are adopted in the electric arc furnace for bottom blowing, and the proportion and flow of the oxygen-containing gas are adjusted according to the C content of the molten pool, the bottom blowing pressure and the temperature. According to the method, oxygen-containing gas reacts with elements in steel, the utilization efficiency of oxygen in the molten steel is improved, the stirring capacity of a molten pool is enhanced, dephosphorization and denitrification of the molten steel are promoted, and it is guaranteed that components of the molten steel reach the standard. Meanwhile, the influence of oxygen-containing gas on the service life of a bottom blowing element is relieved, the smelting period is shortened, the production efficiency is improved, the smelting cost is reduced, and efficient and clean smelting of the electric arc furnace is achieved.

The present application provides a kind of ecological purification method for treating aquaculture tail water, and is sequentially provided with multifunctional drainage ditch, ecological oxidation dam, stable sedimentation pond, continuous biological filter pond and composite purification bed along the direction of aquaculture tail water flow.The garbage intercepting device, ecological revetment and buffer zone are arranged in the multifunctional drainage ditch;The ecological weir, ecological frame, fixed pile, water collecting wall and lifting pump are arranged in the ecological purification dam;The floating plant area, multiple interception and purification devices and aeration device are arranged in the stable sedimentation pond;The culture area is arranged in the continuous biological filter pond, and after the water flow passes through multiple aeration biological filter areas, it enters the effluent area uniformly;The composite purification bed includes plants, improved substrate layer, purification layer, filtration and water collection layer, impermeable layer and effluent area.The method can effectively remove the refractory pollutants and toxic and harmful substances in aquaculture tail water, has low construction cost, small land area, low operation and maintenance cost, and the effluent can be resource utilization.

This invention relates to the field of water treatment technology, specifically disclosing a hydraulically driven continuous flow aerobic granular sludge-membrane filtration integrated device and its application. The device includes an influent system, an effluent system, a reactor shell, a membrane module, and an aeration module. A first baffle is installed inside the reactor shell, dividing the interior into an anoxic zone and an aerobic zone. A multi-stage flow guiding mechanism is vertically arranged within the anoxic zone to change the flow direction of the sludge-water mixture. The aeration module is located at the bottom of the aerobic zone, enabling the sludge-water mixture to circulate between the anoxic and aerobic zones. The membrane module is located within the aerobic zone and positioned above the nano-aeration disc. This invention achieves favorable hydraulic conditions under continuous flow, creating a driving force for granulation and enabling rapid formation and stable operation of aerobic granular sludge. The combination of aerobic granular sludge and membrane module filtration improves effluent quality, reduces membrane fouling, shortens the process flow, and reduces floor space requirements.

The invention relates to the technical field of ecological restoration, and particularly discloses a wave dissipation type lake and reservoir wetland ecological restoration method. The wave-resistant short dike is built at the bottom of the lakeshore levee slope and mainly plays a role in protecting the lakeshore and an aquatic plant planting area, and due to fluctuation of the water level, the wave-resistant short dike can intercept part of dry branches, fallen leaves and soil, can serve as a new plant recovery area and can also serve as a shelter and a habitat of aquatic organisms; the ecological restoration wetland area is established between the lakeshore levee slope and the wave-resistant short levee, different emergent aquatic plants and submerged plants are planted, the wetland structure is optimized, the wetland landscape is beautified, and the propaganda and education effects on tourists and surrounding people can be achieved; meanwhile, due to the fact that wind is heavy and waves are high in middle and large lakes and reservoirs, newly repaired embankments and wave-resistant short embankments are prone to being scoured by water waves and damaged, even the newly built embankments face the danger of being destroyed by water, and meanwhile various aquatic plants, aquatic plants and the like which are planted are destroyed, wind waves can be effectively reduced by building the steel column wave-resistant net.

This invention discloses an integrated device and a method for rapid cultivation of aerobic granular sludge suitable for low-concentration domestic sewage, along with its application. The device comprises a batch reactor body integrating the following functional units: a full-area water distribution unit, including a main inlet pipe and distributed water distribution components; one end of the main inlet pipe is connected to the sewage source, and the other end extends to the bottom of the reactor cavity; the distributed water distribution components are connected to the main inlet pipe and equipped with multiple water distribution holes; a dual-zone aeration unit, including an air pump, a bottom aeration unit with a wide range of adjustable air volume, and a middle aeration unit with precise air volume control; a flow field optimization unit, located at the upper part of the reactor cavity and connected to the main inlet pipe; and a timing control unit, electrically connected to the full-area water distribution unit and the dual-zone aeration unit. The advantages of this invention are: by creating sedimentation selective pressure through dual-zone aeration to achieve sludge stratification, enhanced denitrification of heavy granular sludge, and removal of excess phosphorus from light flocculent sludge, it also has the advantages of shortening the cultivation cycle of aerobic granular sludge and highly efficient denitrification and phosphorus removal.

The present invention discloses a processing method for deep desulfurization and dearomatization of diesel fractions, comprising: a fixed bed reactor having a gas phase reaction zone, a gas-liquid separation zone, a gas-liquid countercurrent zone, a gas-liquid mixing zone and a liquid phase reaction zone from top to bottom; in the gas-liquid separation zone, a diesel fraction raw material is partially converted into a gas phase light fraction and enters the gas phase reaction zone, and a part of the unconverted liquid phase heavy fraction enters the gas-liquid countercurrent zone; a hydrodesulfurization reaction is carried out in the gas phase reaction zone, and the gas phase reaction product flows out from the top of the reactor; hydrodesulfurization, denitrogenation and partial aromatic saturation reaction are carried out in the gas-liquid countercurrent zone; a deep polycyclic aromatic hydrocarbon saturation reaction is carried out in the liquid phase reaction zone, and the liquid phase reaction product flows out from the bottom of the reactor. The present invention realizes efficient hydrodesulfurization reaction and aromatic saturation reaction of diesel fraction oil products under the conditions of low energy consumption and low hydrogen usage, and produces high-quality diesel blending components that meet the National VI standard.

The present invention discloses a circulation type continuous flow aerobic granular sludge sewage treatment system, and relates to the technical field of sewage treatment, the circulation type continuous flow aerobic granular sludge sewage treatment system comprises a structure pool, the structure pool is provided with an inner cavity, and the inner cavity is divided into a deoxidation cavity, an anaerobic cavity, an anoxic laminar flow cavity and a composite cavity; one end of the water inlet mechanism is communicated with sewage, and the other end is communicated with the deoxidation cavity; one end of the water outlet mechanism is communicated with the composite cavity; an overflow port communicated with the anaerobic cavity is formed in the upper part of the deoxidation cavity; a communication port communicated with the anoxic laminar flow cavity is formed in the bottom of the anaerobic cavity; the anoxic laminar flow cavity is provided with a deep tank homogeneous circulation mixing module; the composite cavity is divided into a plurality of communicated sub-cavities, and the sub-cavities are respectively an aerobic cavity and a precipitation screening cavity; the anoxic laminar flow cavity is communicated with the aerobic cavity; the precipitation screening cavity is communicated with a water outlet mechanism, and a sludge interception screening device is arranged below the water outlet position of the precipitation screening cavity. The sewage treatment device has the effects of reducing the sewage treatment cost and improving the sewage treatment stability and efficiency.

The present invention provides a sewage denitrification and denitrification device, comprising a device body, wherein the device body is sequentially divided into an inlet area, a denitrification area and an outlet area from top to bottom. The denitrification area is provided with a supporting layer and a composite filter material layer, wherein the supporting layer is arranged at the bottom of the composite filter material layer, and the composite filter material layer comprises N layers of denitrification modules from top to bottom, wherein N is a natural number greater than 1. The denitrification module comprises a plurality of spherical skeletons, a plurality of denitrification carriers, a plurality of polyurethane foam blocks and a plurality of root bundle-like fiber bodies, wherein the two ends of the bundle-like fiber bodies are respectively connected by spherical skeletons, the interior of the spherical skeleton is hollow, and the denitrification carrier and the polyurethane foam block are arranged inside the spherical skeleton to have a certain protective effect on the denitrification carrier, thereby preventing the denitrification carrier from being damaged by water flow scouring and increasing the difficulty of sewage treatment. At the same time, the ratio of the denitrification carrier and the polyurethane foam block in the spherical skeleton is reasonably matched, so that the buoyancy of the denitrification module can be flexibly adjusted, and all the denitrification modules can be prevented from being piled up together.

The utility model provides a kind of high-efficiency preheating of scrap steel ladle heating device, the device includes top open ladle, ladle cover is covered on the ladle opening, heating burner is set on the ladle cover.The device further includes the retaining wall with closed shape in cross section.The top of the retaining wall is connected with the ladle cover, and the bottom of the retaining wall is close to the scrap steel material surface in the ladle.The internal area enclosed by the retaining wall constitutes the combustion zone of heating burner, and the area between the retaining wall and the side wall of the ladle forms the flue gas discharge channel.The heating burner is arranged on the ladle cover at the corresponding position of the combustion zone.A flue gas outlet is further arranged on the ladle cover at the corresponding position of the flue gas discharge channel.The utility model realizes the preheating of scrap steel by the way of high-temperature flue gas penetrating scrap steel, so that the high-temperature flue gas and scrap steel carry out convection heat transfer, thereby greatly improving the uniformity of preheating temperature and overall preheating temperature of scrap steel, and realizing the high-efficiency preheating of scrap steel.

The utility model discloses an efficient denitrification constructed wetland sewage treatment device, which relates to the technical field of sewage treatment and comprises an expansion frame, a pretreatment component and a planting component, the pretreatment assembly comprises a settling tank, a water inlet pipe, a filler layer and two electric hydraulic cylinders, the settling tank is arranged on the inner side of the bottom end of the expansion frame, the top end of the settling tank is connected with a connecting shell, the water inlet pipe is arranged at the top end of the connecting shell, and the telescopic ends of the two electric hydraulic cylinders are connected with a water pump; the sewage treatment device has the beneficial effects that sewage is preliminarily filtered through the filter screen, the filler layer and the filter sieve plate, so that the sewage is clearer, the water pump is conveniently driven to move up and down through the two electric hydraulic cylinders, the water pumping pipe is conveniently adjusted to the corresponding adjusting position along with the liquid level of clear liquid, and the water pumping pipe is located on the upper surface in the clear liquid; the sediment at the bottom cannot be extracted, clear liquid cannot be mixed, the sediment box is made of acrylic plates, and observation is facilitated due to the transparent material.

The invention discloses a pumpless self-operation method and operation system of an automatically lifting two-stage A / O reaction tank. The self-operation system comprises an anoxic reaction tank with a height-to-diameter ratio of not less than 3 and an aerobic reaction tank with a height-to-diameter ratio of not less than 4. The anoxic reaction tank is fixed on upper and lower telescopic frames, and the bottom of the anoxic reaction tank is higher than the aerobic reaction tank in height from the ground. An impeller with a height of 1 / 2 of the water depth in the tank is installed in the anoxic reaction tank. The bottom of the anoxic zone is connected to the aerobic zone through a lower connecting pipe inclined downward and the upper part is connected to the aerobic zone through a horizontal upper connecting pipe. An aeration device is arranged at the bottom of the aerobic reaction tank. Sewage is pumped from an inlet tank to the center of the impeller through a lifting pump and then enters the tank. The impeller stirs slowly, and muddy water flows into the aerobic zone through the lower connecting pipe from the bottom of the anoxic zone, rises under the action of aeration of the aeration device, and flows into the anoxic zone through the upper connecting pipe to realize pumpless self-flow circulation. The invention realizes pumpless self-flow circulation, can adjust the water depth of the anoxic reaction tank, and change the hydraulic retention time of the anoxic section.