44results about How to "Improve oxygen use efficiency" patented technology

The invention discloses a multistage-series constructed wetland sewage treatment system and method based on solar energy, which are used for multistage biochemical treatment on sewage. The sewage treatment system comprises an A<2> / O treatment device and a constructed wetland treatment system, which are connected in series; the constructed wetland treatment system is formed in such a way that a vertical flow constructed wetland and a horizontal flow constructed wetland are connected in series, and arranged in a shed film photovoltaic solar greenhouse with a ventilation device; an amorphous silicon film solar panel is laid on the outer surface at the top of the shed film photovoltaic solar greenhouse; when sun light energy irradiates the amorphous silicon film solar panel, one part of sun light energy is converted into electric energy, while the other part of sun light energy penetrates the amorphous silicon film solar panel to be used for plant photosynthesis. The sewage treatment system is high in efficiency, and the shed film photovoltaic solar greenhouse meets the illumination and temperature requirements of plants in normal growth in all seasons, achieves the low-cost solar energy generation, and has favorable economic benefits and environmental benefits.

The invention provides a domestic sewage treatment device and method by intermittent aeration contact oxidation process, wherein the device comprises a regulating reservoir (or water collecting tank), an naerobic pool, an intermittent aeration contact oxidation pool, a deposition pool and pipe-lines, water pumps for connecting these pools, a bagger is arranged on the extremity end of the intermittent aeration contact oxidation pool. The intermittent aeration contact oxidation pool can be charged with agents on the tail end as required, the sludge in the bagger returns to the anaerobic pool for treatment.

The invention discloses a rainwater wash-out ecological toilet based on solar power generation. The rainwater wash-out ecological toilet based on solar power generation comprises a rainwater filtering and collecting system, a solar power generation and supply system, a PLC control system, an integrated public toilet body, a combined sewage treatment system and a composite artificial wetland system which are all sequentially connected. The solar power generation and supply system is arranged on the top of the integrated public toilet body and used for supplying power to the rainwater filtering and collecting system, the PLC control system, the integrated public toilet body, the combined sewage treatment system and the composite artificial wetland system. The rainwater filtering and collecting system is used for collecting rainwater and filtering and processing the rainwater, and then the rainwater can be supplied to the toilet. The combined sewage treatment system and the composite artificial wetland system are connected in series for use and used for processing drained water of the toilet. The PLC control system is used for performing automatic control over the whole system. The toilet supplies power through clean energy. The drained water of the toilet can be effectively processed, maintenance cost is low, and the ecological toilet has very important ecological benefits, economic benefits and social benefits.

The invention discloses an oxygenation system with a pressure type and a non-foam membrane type and a method thereof. In the system, a regulating pond is connected with a flocculation subside pond and an oxidation reaction pond; membrane type of non-foam aeration oxygenators are respectively connected with the flocculation subside pond and the oxidation reaction pond; a hydraulic distributor is arranged on the bottom of the oxidation reaction pond. The method of the invention comprises the processes: raw water flows into the flocculation subside pond through the regulating pond; supernatant of the flocculation subside pond flows into the membrane type of non-foam aeration oxygenator automatically or by a pump; water non-foam oxygenated when flows on the membrane surface flows into the bottom of an activity mud oxidation reaction pond through a membrane type of non-foam aeration oxygenation pond and the hydraulic distributor; as rolling flow is formed by the effect of hydraulic flow, the method plays an effect of mixture stirring simultaneously. The oxygenation method of non-foam membrane type is characterized by simple technology, low energy consumption, small occupied area and high application effect of oxygen, etc. The oxygenation method is specially suitable for updating and transforming of the activity mud aeration pond (aerobic oxidation reaction pond) in the technology of wastewater processing.

The invention discloses a compound blast and aeration system that is applied in a biological contact oxidation system; the system is arranged under filler, and comprises a liftable tube-type catenaries suspension Millipore aerator and fixed perforation tube-type aeration device; the liftable tube-type catenaries suspension Millipore aeration device is arranged under the filler, and the fixed perforation tube-type aeration device is arranged under the liftable tube-type catenaries suspension Millipore aerator. The advantage of high oxygen utility ratio of the liftable tube-type catenaries suspension Millipore aerator is organically combined with the advantages of high scour intensity and easy regeneration of biomembrane of the fixed perforation tube-type aeration device, so as to lead the whole system to maintain the characteristics of high oxygen transfer rate, strong biomembrane activity, etc. The technology is convenient to implement, and the management and maintain are simpler; and the system has larger development space in the field of a biological contact oxidation aeration system.

The invention designs a sewage treatment device and particularly relates to a domestic sewage integrated treatment unit used for treating the non-traditional sewage (no flushing water). The domestic sewage integrated treatment unit comprises a reaction vessel, biology filler and a micro-filtration membrane module, wherein a water inlet pipe 10 is arranged at one side in the reaction vessel 5; one end of the water inlet pipe 10 extends into the bottom of the reaction vessel 5 and is connected with an aerator pipe 7 of a water inlet system arranged at the bottom of the reaction vessel 5; an air inlet pipe 12 is arranged at the other side in the reaction vessel 5; one end of the air inlet pipe 12 extends into the bottom of the reaction vessel 5 and is connected with an aerator pipe 8 of an air inlet system arranged at the bottom of the reaction vessel 5; and after being connected in series, the filler 4 is suspended on an aerator hole 13 of the aerator pipe 7 of the water inlet system. Aiming at the characteristics of the China specific domestic sewage, the invention provides the domestic sewage integrated treatment unit which is economically feasible really and has the advantages of small occupied area, simple process and low operating cost.

A concentrate burner for feeding a pulverous concentrate mixture and reaction gas into a reaction shaft of a flash smelting furnace. The concentrate burner includes a feeder pipe for feeding a concentrate mixture into the reaction shaft and a dispersing device for directing dispersing gas to the concentrate mixture flowing around the dispersing device. For feeding the reaction gas into the reaction shaft, a gas supply device is provided which includes a reaction gas chamber for mixing the reaction gas with the concentrate mixture, and for directing the concentrate mixture to the side by the dispersing gas. The reaction gas chamber includes a turbulent flow chamber, to which an inlet channel opens tangentially for directing the reaction gas to the reaction gas chamber in a tangential direction. In the inlet channel, an adjusting member is arranged for adjusting the cross-sectional area of the reaction gas flow.

The invention discloses an electric-arc furnace converter process for smelting steel and iron slag, belongs to the field of metallurgy, and aims to solve the technical problem about providing the electric-arc furnace converter process for smelting steel and iron slag with short duration of heat and low power consumption. In order to solve the technical problem, the invention provides the following technical scheme: furnace burden comprises molten iron, steel and iron slag, and steel scrap; molten iron is put into the furnace to enable the tapping of the molten iron accounts for 30-60% of that of all furnace burden; steel and iron slag is put into the furnace to enable the tapping of the steel and iron slag accounts for 35-70% of that of all furnace burden; when the steel scrap is put into the furnace for the first time, the tapping of the steel scrap accounts for 0-5% of that of all furnace burden; when the steel and iron slag is put into the furnace for the first time, the steel scrap is also put into the furnace, and the steel scrap is distributed on the steel and iron slag. With adoption of the process, the physical and chemical heat brought about by the molten iron is fully utilized to accelerate furnace burden melting and formation of the furnace burden in the furnace hearth, shorten melting time, reduce smelting power consumption, improve productivity and reduce production cost.

The invention relates to sewage treatment equipment based on in-situ control of biofilm thickness, and a control method of the sewage treatment equipment. The equipment comprises a water inlet tank, a water feed pump, a reactor and a water outlet valve which are sequentially connected, wherein a non-foam aeration membrane is arranged in the reactor; the equipment further comprises a gas pressure regulating valve for adjusting the oxygen partial pressure and the dissolved oxygen concentration in the membrane; one end of the gas pressure regulating valve is connected with an air compressor, and the other end of the gas pressure regulating valve is connected with the non-foam aeration membrane by means of an intake pipe assembly; after sludge is inoculated into the reactor, the pH value of wastewater is adjusted in advance, and the wastewater containing high ammonia nitrogen enters the reactor; by adjusting the oxygen partial pressure and dissolved oxygen concentration in the membrane of the reactor, a oxygen-contaminated substrate is diffused and transmitted in the opposite direction in the biofilm after the biofilm is formed on the surface of the non-foam aeration membrane, and nitrification and denitrification are carried out synchronously. Compared with the prior art, the sewage treatment equipment reduces the demand of an electronic donor, the membrane device occupies a small area, the cost of sewage treatment is lowered, and low-carbon sewage treatment is realized.

The invention provides a water purification system, belonging to the field of water treatment. The water purification system comprises an oxygenation device and a microbial carrier device, wherein the oxygenation device comprises an air compressor, a magnetic assisted cyclone gas dispersion pipe and a gas inlet pipe connected between the air compressor and magnetic assisted cyclone gas dispersion pipe; the microbial carrier device comprises a floating barrel, a basalt fiber carrier and a concrete precast block; the upper and lower ends of the basalt fiber carrier are respectively connected with a floating ball and the concrete precast block; and the basalt fiber carrier is suspended in water. Sewage forms abundant gas bubble flow after passing through the magnetic assisted cyclone gas dispersion pipe, and submarine aboriginal microbes are attached to the basalt fiber carrier and perform massive reproduction. The water purification system can increase the dissolved oxygen concentration in the water body and the aboriginal microbial biomass in water. The microbubbles are utilized to oxidize the sediment and reduce the endogenous pollution, and the microbes on the carrier are utilized to degrade the pollutants in the water body, thereby implementing efficient and quick purification of the pollutants in the closed water body.

The invention relates to an advanced municipal sewage treatment process which comprises the flows of anaerobic pool, oxidation ditch pool, aerobic pool and MBR (membrane bioreactor) membrane pool. The process has two backflow paths: oxidation ditch pool-anaerobic pool and membrane pool-oxidation ditch pool. The pretreated municipal sewage flows through the anaerobic pool, the oxidation ditch pool, the aerobic pool and the membrane pool in sequence, and finally undergoes membrane filtration to obtain treated water. When the process is used for treating municipal sewage, extra addition of carbon source and phosphorous removal drug is not needed, the total nitrogen removal rate and the total phosphorous removal rate can be up to 95% at the same time, the total nitrogen concentration of effluent is less than 5mg / L, the total nitrogen concentration is less than 0.3mg / L, and the other indexes satisfy the national level-I A discharge standard. In the prior art, the total nitrogen removal rate is 62-80% in general, and the total phosphorous removal rate is 70-96.2% in general.

The invention relates to a biochemical treatment device for sewage, which comprises an air supply pipe, a biochemical pool body, and a water outlet and a sewage inlet both formed in the biochemical pool body; an inverted-cone-shaped separation rotational flow mud collecting pit is formed at the bottom of the biochemical pool body; a mud discharging port is formed in the mud collecting pit; a horizontal water pipe connected with the sewage inlet, as well as tangential water jetting heads, is distributed above the mud collecting pit; the sewage inlet is arranged above the horizontal water pipe and the tangential water jetting heads; at least one riser tube is vertically arranged above the biochemical pool body; the air outlet end of the air supply pipe extends into the lower part of the riser tube, and the air inlet end extends out of the biochemical pool body; the biochemical pool body is sequentially divided into an aerobiotic zone, an oxygen-poor zone, and an anaerobic zone from the top down; the water outlet is arranged at the upper part of the aerobiotic zone; a baffle is arranged in the biochemical pool body close to the water outlet; and the top of the baffle is higher than the water outlet on the pool body. The invention further relates to a treatment method adopting the treatment device. The biochemical treatment device for sewage and the treatment method thereof have the characteristics of simple technology, low cost and energy conservation.

The invention provides a portable oxygen generator, which comprises a shell, an oxygen generation unit, a sensor unit, a pulse electromagnetic valve, an oxygen outlet joint, a control unit and a power supply module, wherein the oxygen generation unit is connected with the oxygen outlet joint through the pulse electromagnetic valve, the oxygen generation unit comprises a direct-current compressor, a molecular sieve and an oxygen storage tank, the direct-current compressor absorbs air from the outside and compresses the air to the molecular sieve for oxygen and nitrogen separation, then oxygen is fed into the oxygen storage tank, the control unit controls and adjusts the pulse electromagnetic valve according to information of the sensor unit, the sensor unit comprises a respiration sensor, and the control unit adaptively controls the oxygen generation unit and the electromagnetic valve to work through a preset program according to detection information of the respiration sensor so as to control the frequency and flow of pulse oxygen supply. According to the invention, the feedback regulation mechanism of the portable oxygen generator not only adapts to the actual oxygen demand of a user in a plateau environment, but also can effectively save energy and prolong the endurance time of the oxygen generator.

The invention provides an MBR (membrane bioreactor) system with low energy consumption and high treatment capability. The MBR system comprises a sealed MBR, a water inlet pipeline, a water outlet pipeline, a gas inlet pipeline and an exhaust pipeline, wherein the MBR comprises a biochemical assembly and a membrane assembly; air or oxygen is introduced into the MBR through the gas inlet pipeline for aeration, and certain pressure is formed in the MBR. The MBR system has the advantages that 1, a pressure aeration technology is used, so that the dissolved oxygen concentration of an aerobic pool in the biochemical treatment assembly is greatly improved; 2, high aeration intensity can be realized through small aeration quantity, so that the aeration pool volume can be greatly reduced; further, the volume and the cost of the MBR system are reduced; 3, the gas pressure driving is used for replacing the existing self sucking pump driving mode for reducing the membrane driving energy consumption; 4, the gas circulation of an aeration system is realized in various modes, so that the gas overbottom pressure is fully utilized, and the energy consumption of the system is further reduced.

The invention relates to the field of environment protection and discloses an in-situ sludge recycling system device which comprises a vertical non-dynamic spiral stirring biological drying device, avertical sandless jet carbonization furnace, a crushing vacuum liquefaction device, a tail gas wet process treatment device, a dust collector, a heat exchanger and a negative pressure device. According to the in-situ sludge recycling system device, sludge is treated by using a technique of biological drying and carbonization energy-saving resource recycling and in-situ recycling, a truly seamlessclosed loop of sludge treatment and disposal is achieved, meanwhile, development of related industries is promoted, and the requirements of "green, recycling and low-carbon" are truly achieved. The technique is a novel comprehensive sludge treatment and disposal system with a high integration degree, and has the technical advantages of being low in operating cost, small in floor space, high in automation degree, simple in operation management, free of secondary pollution, and the like.

The invention belongs to the field of wastewater treatment, and particularly relates to an automatic aeration-type biological membrane transfer device. The automatic aeration-type biological membrane transfer device disclosed by the invention comprises a water channel, a water inlet, a sludge outlet, and a water outlet, wherein the water inlet and the water outlet are located at the lower side of the center line of a spindle, and distributed in a diagonal line on the water channel; the water inlet, the sludge outlet and the water outlet are arranged at different sides of the water channel; the device also comprises a rotating ring; the rotating ring is arranged inside the water channel through a rotating shaft; and the rotating ring is connected with a drive device. The automatic aeration-type biological membrane transfer device adopts a form of the rotating ring, drives the rotating ring to rotate by virtue of rotation of the rotating shaft, alternatively and fully contacts the air and sewage, and carries out oxygen transfer and mass transfer movement. The automatic aeration-type biological membrane transfer device is integrated with the characteristics of large hang membrane area of an elastic solid filler, high processing load, strong impact resistance and the like, and has the advantages of being simple in structure of a biological turntable, low in construction cost, simple to run and maintain, and the like.

The invention discloses an oxygenation system with a pressure type and a non-foam membrane type and a method thereof. In the system, a regulating pond is connected with a flocculation subside pond and an oxidation reaction pond; membrane type of non-foam aeration oxygenators are respectively connected with the flocculation subside pond and the oxidation reaction pond; a hydraulic distributor is arranged on the bottom of the oxidation reaction pond. The method of the invention comprises the processes: raw water flows into the flocculation subside pond through the regulating pond; supernatant of the flocculation subside pond flows into the membrane type of non-foam aeration oxygenator automatically or by a pump; water non-foam oxygenated when flows on the membrane surface flows into the bottom of an activity mud oxidation reaction pond through a membrane type of non-foam aeration oxygenation pond and the hydraulic distributor; as rolling flow is formed by the effect of hydraulic flow, the method plays an effect of mixture stirring simultaneously. The oxygenation method of non-foam membrane type is characterized by simple technology, low energy consumption, small occupied area and high application effect of oxygen, etc. The oxygenation method is specially suitable for updating and transforming of the activity mud aeration pond (aerobic oxidation reaction pond) in the technology of wastewater processing.

The invention relates to an internal component for strengthening a refining wastewater biochemical mixing mass transfer reaction process. The internal component comprises a barrel body and a water and gas distribution structure. The internal component is characterized in that the water and gas distribution internal component mainly comprises a transmission internal component and a mass transfer internal component. The transmission internal component is composed of a hydraulic lifting device, a central circulating cylinder and a water distributor; and the mass transfer internal component is composed of an auxiliary cylinder and a pressure air releaser. The internal component can realize gas-liquid-solid high-strength mixing, has the characteristics of uniform mixing, high mass transfer rate and high oxygen dissolving efficiency, can adjust the radius of reflux circulating water, remarkably strengthens the mixing and mass transfer effects of biochemical reaction, shortens the hydraulic retention time, can be used for a deep water biochemical device, and reduces the occupied area of the biochemical device.

The invention relates to a water body in-situ purification solar aeration plug flow device which comprises floating discs and floating frames, wherein the floating discs are assembled in an annular manner; the floating frames are arranged inside and outside the floating discs; aquatic plants are planted on the floating discs; photovoltaic plates which are uniformly distributed in a circumferentialdirection are arranged on inner sides of the floating discs; the photovoltaic plates are fixed on a bracket and are higher than a water level; the bracket is connected the upper part of a sleeve pilewhich is inserted into the bottom of a water body; an aeration pump is arranged above the water level; the output end of the aeration pump is connected with a micro nanopore aeration tube which is arranged in the water body; a water pump is arranged inside the water body; the output end of the water pump is connected with one end of a water conveying tube; the other end of the water conveying tube is arranged in a water body outside the area of the whole device; pressure stabilizing controllers are arranged on inner sides of the photovoltaic plates; input ends of the pressure stabilizing controllers are electrically connected with the photovoltaic plates; output ends of the pressure stabilizing controllers are connected with the aeration pump and the water pump. By adopting the device, automatic control can be achieved, energy can be saved, the utilization rate of oxygen can be increased, and a good application effect can be achieved in a sealed water body.

The invention provides a biological filter tank for wastewater treatment. The biological filter tank comprises a tank body that comprises a first tank body and a second tank body; wherein the bottomsof the first tank body and the second tank body are communicated, a transverse filler frame for fixing filler is arranged in the first tank body, a transverse aeration pipe is arranged on the lower portion of the transverse filler frame; the transverse filler frame is arranged on a communication part, and long-handle filter caps are uniformly arranged on the lower surface of the filler; the secondtank body comprises three groups of vertical packing frames, packing is fixed through the vertical packing frames, the thickness of the middle vertical packing frame in the three groups of vertical packing frames is 1.5-2 times that of the vertical packing frames on the two sides, and the water passing resistance of the packing in the middle vertical packing frame is smaller than that of the packing in the vertical packing frames on the two sides; turbulent flow stirring blades and vertical aeration pipes are arranged on the two sides of the middle vertical packing frame. Thebiological filtertank is simple in structure, low in equipment energy consumption and good in purification effect, and can be used at the rear end of a sewage treatment process for fine treatment of purified water.

The invention provides a full-amount treatment system and method for leachate of a waste transfer station, and the system comprises an electric flocculation reaction tank, an MBR biochemical reactor, an STRO membrane module, an AOP reaction tower and a BAC reaction tower which are connected in sequence, and also comprises an ozone generator, a pure oxygen preparation device and a sludge dewatering device; the anode of the electric flocculation reaction tank can generate oxygen bubbles or chlorine bubbles, and the cathode of the electric flocculation reaction tank can generate hydrogen bubbles; the MBR biochemical reactor comprises an anaerobic tank, an aerobic tank and an MBR ultrafiltration membrane assembly which are connected in sequence, and the aerobic tank performs pure oxygen aeration in a jet aeration feeding manner and can generate oxygen bubbles with the diameter smaller than 50 microns; the STRO membrane assembly is connected with the MBR ultrafiltration membrane assembly, and the AOP reaction tower is connected with a concentrated solution outlet of the STRO membrane assembly; the ozone generator is connected with the AOP reaction tower, the pure oxygen preparation device is respectively connected with the aerobic tank and the ozone generator, and the sludge dewatering device is respectively connected with the electric flocculation reaction tank and the anaerobic tank. According to the invention, the leachate of the waste transfer station can be effectively discharged up to the standard.

A livestock and poultry breeding wastewater treatment device and method are disclosed. The device comprises an anaerobic zone, an aerobic zone and an ozone zone which are sequentially arranged, wherein an inlet of the anaerobic zone is connected with a water inlet pipe, the upper portion of the anaerobic zone is connected to the aerobic zone, the upper portion of the aerobic zone is connected to the ozone zone through a pipeline, and an outlet of the ozone zone is connected to a water outlet pipe; an aeration device and a membrane component are arranged in the aerobic zone, and an ozone inputchannel is arranged in the ozone zone. According to the device provided by the invention, an ozone oxidation process is added after anaerobic-aerobic membrane process treatment and tail water after ozone treatment can flow back to the anaerobic zone; through anaerobic ammonia oxidation and short-cut nitrification denitrification, and through ozone, organic pollutants in the wastewater are furtherdegraded, meanwhile, the wastewater decolorization and disinfection effects are improved, and the effluent quality meets the discharge standard of the livestock and poultry industry or zero dischargecan be realized through reclaimed water reuse.

The invention provides a multifunctional loaded catalyst, a preparation method thereof, and application of the catalyst to combined removal of CO in flue gas. The multifunctional loaded catalyst comprises a carrier as well as an alkali-based component and a metal active component which are loaded on the carrier. The loaded metal catalyst is modified by the alkali-based component of KOH or NaOH andthe like, so the synergistic effect of CO2 removal and CO removal can be realized. The multifunctional catalyst is simple in preparation method, high in CO2 removal rate and CO catalytic reaction activity, high in stability after long-time use and suitable for CO and CO2 combined removal in fire disaster flue gas of closed space such as a submarine, a space station and a refuge chamber for mining, so that microenvironment purification after the closed space fire disaster is realized. The experiment indicates the multifunctional catalyst provided by the invention can realize synergistic effective removal of high-concentration CO2 (0.5 to 15.0 percent) and CO (0.1 to 0.5 percent) at 0 to 200 DEG C.

The invention discloses an electric-arc furnace converter process for smelting steel and iron slag, belongs to the field of metallurgy, and aims to solve the technical problem about providing the electric-arc furnace converter process for smelting steel and iron slag with short duration of heat and low power consumption. In order to solve the technical problem, the invention provides the following technical scheme: furnace burden comprises molten iron, steel and iron slag, and steel scrap; molten iron is put into the furnace to enable the tapping of the molten iron accounts for 30-60% of that of all furnace burden; steel and iron slag is put into the furnace to enable the tapping of the steel and iron slag accounts for 35-70% of that of all furnace burden; when the steel scrap is put into the furnace for the first time, the tapping of the steel scrap accounts for 0-5% of that of all furnace burden; when the steel and iron slag is put into the furnace for the first time, the steel scrap is also put into the furnace, and the steel scrap is distributed on the steel and iron slag. With adoption of the process, the physical and chemical heat brought about by the molten iron is fully utilized to accelerate furnace burden melting and formation of the furnace burden in the furnace hearth, shorten melting time, reduce smelting power consumption, improve productivity and reduce production cost.

The invention belongs to the field of wastewater treatment, and particularly relates to an automatic aeration-type biological membrane transfer device. The automatic aeration-type biological membrane transfer device disclosed by the invention comprises a water channel, a water inlet, a sludge outlet, and a water outlet, wherein the water inlet and the water outlet are located at the lower side of the center line of a spindle, and distributed in a diagonal line on the water channel; the water inlet, the sludge outlet and the water outlet are arranged at different sides of the water channel; the device also comprises a rotating ring; the rotating ring is arranged inside the water channel through a rotating shaft; and the rotating ring is connected with a drive device. The automatic aeration-type biological membrane transfer device adopts a form of the rotating ring, drives the rotating ring to rotate by virtue of rotation of the rotating shaft, alternatively and fully contacts the air and sewage, and carries out oxygen transfer and mass transfer movement. The automatic aeration-type biological membrane transfer device is integrated with the characteristics of large hang membrane area of an elastic solid filler, high processing load, strong impact resistance and the like, and has the advantages of being simple in structure of a biological turntable, low in construction cost, simple to run and maintain, and the like.

The embodiment of the invention discloses a method for treating wastes. The method comprises the following steps: a. obtaining the upper aeration environment in a bioreactor, setting the aeration times and the time of every aeration, and carrying out upper aeration treatment; b. after completing upper aeration for the set aeration times, detecting the pH value of percolate in the bioreactor; c. stopping upper aeration when the pH value of the percolate is more than 7, collecting methane generated in the bioreactor, and executing the next step after completing collection; d. resetting the aeration times and the time of every aeration when the pH value of the percolate is less than 7, then carrying out upper aeration treatment and returning to the step b; d. restarting and executing upper aeration once and degrading the wastes. The embodiment of the invention also discloses a system for treating wastes. By adopting the method and system disclosed by the embodiment of the invention, the problems that the methane yield is reduced when the upper aeration frequency is relatively high and the waste treatment time is relatively long when the upper aeration frequency is relatively low in the prior art are solved.