39results about How to "Reduce short flow" patented technology

The invention discloses a spirally wound electrochemical water treatment reactor. The spirally wound electrochemical water treatment reactor comprises a vertically-arranged long-barrel-shaped shell; the interior of the shell is reaction space; the shell is provided with a water inlet and a water outlet connected with the reaction space; an electrocatalytic oxidation assembly is arranged in the reaction space in the shell and divides the reaction space located between the water inlet and the water outlet; the electrocatalytic oxidation assembly is formed by compounding and spiral winding of a positive electrode layer, a positive / negative electrode insulating layer, a negative electrode layer and a supporting layer; the positive electrode layer and the negative electrode layer are both of a net structure; and the distance between the negative electrode layer and the positive electrode layer is in a range of effective distances allowing an electrocatalysis reaction to occur between the negative electrode layer and the positive electrode layer. The structure of the reactor provided by the invention is beneficial for saving space, enlarging a reaction area, increasing gas-liquid polyphase mass transfer efficiency and realizing high-efficiency, long-acting and low-consumption treatment of pollutants in water.

The invention provides an integrated sewage treatment apparatus and a sewage treatment process flow using the apparatus. The sewage treatment apparatus comprises an anaerobic biological treatment pool, an aerobic biological treatment pool, a sewage sedimentation pool and a membrane biological reaction pool; and the anaerobic biological treatment pool, the aerobic biological treatment pool, the sewage sedimentation pool and the membrane biological reaction pool are sequentially connected. The apparatus is used to carry out effective integrated treatment on sewage. The integrated sewage treatment apparatus has the advantages of good sealing property, strong adaption ability to various foundation conditions, acid and alkali resistance, oxidation resistance, no deformation under high or low temperature, and long service life. The sewage production cycle and the onsite construction installation cycle are short, so the apparatus can be fast used; early disposable investment is small, so the operating cost is low; the quality of discharged water is stable, and pollution discharge is maximally treated; the sewage treatment apparatus has a small size, saves space, can be conveniently carried; and the apparatus can be used in a landfill mode, so the occupied earth's surface area is extremely small, noise is small, and the apparatus can be extremely well combined to surrounding living environment.

The invention discloses a rural domestic sewage dealing system with landscape function with scattered plots of unutilized land. The invention is characterized by the following: communicating with the filtering bed and the anaerobic tank; changing the traditional three-lattice-anaerobic tank; increasing the grid at the first lattice of the anaerobic tank; changing the discharging method at the immediate between the traditional first lattice wall and the second lattice wall; hanging the fiber filling at the third lattice. The filtering bed is divided into three lattices, the first lattice is an arranging water tank, the second lattice is filled three-layer composite base filtering material, and the third lattice is a water collecting sump. The waste water expands all rounds with the upflow straining function and capillarity of three-layer composite base filtering and is purified by filtering, depositing, absorbing and microbiological degradation. The invention has the simple operation, the good purifying effect and the good decorating environment effect.

The artificial wetland effluent collector as one effluent collector for sewage treating artificial wetland includes two parts, a buffering gravel region and a water collecting groove. The buffering gravel region has a perforated water distributing wall for controlling water flow from the wetland and ensuring homogeneous distribution of the inflow, and a flute-shaped collecting pipe in the effluent side for collecting water. The flute-shaped collecting pipe comprises several flute-shaped pipes with valve and water collecting unit. The present invention can ensure the pseudo-parallel flow state of sewage in the wetland.

The invention discloses a multilayer vertical methane biological oxidation device, relating to the technical field of greenhouse gasses abatement, wherein the device is composed of a reactor, methane supply system and air supply system. Methane and air is forcibly led to flow along the pores of filling medium up to down in the device by the gas supply system. Plurality of gas-arranging layers are vertically mounted in the reactor to realize the frequent mixing for the gas to reduce the short flow of the gas, provide growth advantage for methane oxidation bacteria in the filling medium, and make the methane to be continuously decomposed in the device to transform into CO2 and discharge from the outlet at last.

The invention provides a splitted and equalized combined gas and water forced cross-flow cleaning tubular submerged membrane unit comprising membrane tubes, a support structure, an air intake pipe, awater collecting pipe, a connecting pipe head and a soft connecting pipe, and a plurality of membrane tubes as a set are inserted vertically into the interior of the support structure. The most remarkable innovation of the splitted and equalized combined gas and water forced cross-flow cleaning tubular submerged membrane unit is that after dividing the whole bundle of membrane filaments into multiple bundles, the membrane bundles are uniformly thinned in a narrow space formed by a guide cylinder which air and water must pass by and the inner walls of the membrane tubes, the membrane tubes arein a submerged and vertical suspension state, the cross-flow turbulent cleaning effect of an air-water mixture on the surface of the membrane filaments filled in the space is enhanced, the short-flowand dead-end phenomena of the air and the water pass by can be greatly reduced, the sufficient cleaning of the surface of the membrane filaments can be effectively ensured, and the problems such as damage and breakage caused for the reason that dirt among the membrane filaments inside a hollow fiber membrane filter element is hardened and deposited to cause incomplete cleaning, and the membrane filaments are easily entangled with each other can be overcome.

The invention discloses a large three-lattice integrated geographical septic tank and a making method thereof. The large three-lattice integrated geographical septic tank comprises a tank body, a feces inlet pipe, a feces outlet pipe and a check hole, wherein the tank body comprises an upper half tank body and a lower half tank body which are abutted together, and a sealing rubber mat is arranged at a combined part of the upper half tank body and the lower half tank body; the tank body is internally provided with a two-lattice support shaped like a Chinese character 'Jing' and a partition plate, wherein the support shaped like the Chinese character 'Jing' and the partition plate are used for sequentially dividing the inside of the tank body into three cabins which are respectively a first-stage anaerobic chamber, a second-stage anaerobic chamber and a clarifying chamber; the bottom of the first-stage anaerobic chamber is communicated with the bottom of the second-stage anaerobic chamber; the partition plate is provided with holes which are vertically staggered. The large three-lattice integrated geographical septic tank can be used for remarkably improving the compressive strength and has the characteristics of acid and alkaline resistance, corrosion resistance, long service life, no gaps, good integrality, no leakage, no pollution to underground water, no environment pollution, benefit for ecological environment and the like. By using the large three-lattice integrated geographical septic tank, the processes for treating sludge, digestion gas and wastewater at the water outlet end of the septic tank can be separated, so that the interference of an air floating phenomenon to wastewater treatment is avoided.

The invention relates to a method for preparing a cigarette dual-fiber hybrid filter tip by utilizing soybean fibers, and the method comprises the following steps of: disentangling and stretching a soybean fiber bundle, eliminating surface static electricity and reducing curling and winding of the fibers; forming the surface wet soybean fibers and cellulose acetate fibers in a ratio of 4:1 into tows, and evenly mixing the two fibers; transversely stentering the evenly mixed tow, drawing till no obvious lamination, and evenly applying a plasticizer to the surface; fabricating a cigarette filter stick by means of a filter stick forming machine, and then cutting the filter stick into filter tips for wrapping cigarettes. Compared with the prior art, the filter tip prepared by the method provided by the invention is even in voids, and is good in effect of capturing granule-phase and gaseous-phase particles and larger in fiber absorption surface; the soybean fibers adopted in the invention belong to regenerable plant fibers and can be easily and biologically degraded under natural conditions. The soybean fiber-acetate fiber hybrid filter tip can be used for providing a new technical way for cigarette production while keeping the quality of cigarette smoking unchanged and reducing the harm of cigarette smoking.

The invention discloses an oil separation lifting treatment method for restaurant wastewater. The method includes the following steps of firstly, separating sundries out of restaurant wastewater; secondly, achieving oil-water separation through an oil-water separation tank; thirdly, achieving sewage lifting discharge through a sewage lifting box. At least one liquid distribution baffle of a porous structure is additionally arranged at the liquid inlet position of the oil-water separation tank, and the baffles stand in the oil-water separation tank in a perpendicular state or an inclined state so that a fed liquid distribution guide system can be formed. An overflow weir type water sealing device is adopted between the oil-water separation tank and the sewage lifting box. When wastewater enters the oil-water separation tank, it can be ensured that a uniform flow dividing effect and the effect of reducing short flow and turbulent flow of wastewater are achieved, so that flowing dead zones are avoided; it can also be ensured that water layer stability breakage caused when discharged water in the sewage lifting box is too concentrated and forms vortexes in water layers is avoided.

The invention relates to a rainwater and sewage treatment system based on multi-point mixed drainage and regulation and storage. The system comprises an intelligent intercepting well and an initial rainwater regulation and storage sewage intercepting chamber which are communicated with each other. The intelligent intercepting well discharges sewage or rainwater entering from the treatment drainageport to the initial rain regulation and storage sewage intercepting chamber through the sewage intercepting pipeline during dry season pollution discharge or rainy season initial rain; and the initial rainwater regulation and storage sewage interception chamber is used for pretreating sewage discharged by the intelligent intercepting well and then discharging the pretreated sewage to the sewage treatment plant, or the initial rainwater in the rainy season is treated and then stored. Sewage in dry seasons and initial rain in rainy seasons are intercepted by the intelligent intercepting well and are converged into the initial rain regulation and storage sewage intercepting chamber, rainwater in the later period of initial rain in the rainy season is discharged to the water body, the initialrain regulation and storage sewage interception chamber primarily treats sewage and then discharges the sewage to the sewage treatment plant, the initial rain is treated and then stored, dry season sewage interception of a mismixed rainwater outlet and collection of initial rainwater in the rainy season are achieved, pollution to the receiving water body is reduced, and a guarantee is provided for water body quality improvement.

The invention relates to an energy-saving and efficient ecological floating island. The whole ecological floating island equipment mainly comprises three functional regions, namely an aquatic plant region, a filler region and an aeration system region, an ecological floating island structure adopts a plastic material with stable performance, a main frame is built by using an assembling mode, so that transportation is facilitated, an aeration system is powered by using solar energy, the night aeration work of the aeration functional region is controlled through a photoinduction technology, so that dissolved oxygen of a water body can be increased, in addition, the energy consumption can be reduced, the aquatic plant region has adsorption and enrichment effects, a biological filter technology is coupled, so that the short flow of sewage at the cross section of the water body can be reduced, and the contact probability of a filler and pollutants can be increased. The energy-saving and efficient ecological floating island has the technical advantages that the problem that aquatic plants do not produce oxygen at night without photosynthesis, meanwhile, the problem that the content of the dissolved oxygen of the water body is low due to biological metabolism and oxygen consumption can be solved, the sewage treatment capacity is effectively improved, the landscape function is good, the cost is low, and the management is simple.

The invention discloses a short-cut nitrification and denitrification coupled anaerobic ammonia oxidation denitrification reactor and complete equipment, and belongs to the field of sewage treatment. The device comprises a tank body, a filler module and a circulating pipeline, the tank body comprises a lower-section sludge hopper, a middle-section central water inlet pipe and a filler area which are arranged from bottom to top in the vertical direction, and a heater is mounted on an upper-section circulating pump water inlet pipe; an aerator pipe is arranged in the sludge hopper; a sludge discharge pipe is arranged at the lower section; the central water inlet pipe is fixed on the filler module bracket; an annular water distributor is mounted at the lower section of the central water inlet pipe through a flange; the spherical mounting fillers are made into strings and fixed in the filler frame, and the filler frame is placed on the filler module support. And an insulating layer, a sampling port and a top cover plate are arranged outside the tank body. By strictly controlling the dissolved oxygen concentration and temperature in the reactor, short-cut nitrification and denitrification coupled anaerobic ammonia oxidation high-efficiency denitrification can be realized, so that the aim of purifying water is fulfilled.

The invention relates to a simple pendulum motion electrode sewage treatment device which comprises a sewage treatment tank, a rotating shaft is rotatably mounted at the upper part of the sewage treatment tank, two ends of the rotating shaft extend out of the sewage treatment tank and are connected with a simple pendulum type magnet magnetic needle assembly, and an electromagnet driving structure is arranged under the end part of the rotating shaft; and the part, positioned in the sewage treatment tank body, of the rotating shaft is connected with an electrode bracket; an electrode group is placed in the electrode bracket. By means of simple pendulum motion of the electrode group and relative immobility of sewage, short flow is reduced, concentration polarization is reduced, formation of dirt on the electrodes is slowed down, the distance between electrode plates is reduced, the organic matter pollution decomposition effect is improved, energy consumption is reduced, electromagnet repulsive force provides swing driving force when the mass block is located at the bottom, and the device has the advantages of simple structure, wide electrode application type, low manufacturing cost, low energy consumption and long service life.

The invention discloses a domestic sewage treatment system comprising an anaerobic treatment system, an aerobic treatment system, a precipitation system, a disinfection system, a sludge storage systemand a power distribution room; the anaerobic treatment system is additionally provided with a filler baffle plate and a rotary filler box, so that the contact time and area of domestic sewage and filler are increased, and the starting time is shortened; an underflow stirrer is additionally arranged, so that the problems of short flow, dead corner and the like are reduced; the volumes of compartments of a reactor are different, and the degradation efficiency is improved by utilizing the difference of microbial communities; according to the aerobic treatment system, a flow baffle is additionally arranged, the dissolved oxygen amount is increased in a mechanical mode, and the operation cost is saved; the different-wave baffle plate is utilized, so that the inflow retention time is prolonged,the surface of the baffle plate is rough, a film is easy to form on the baffle plate, and the treatment efficiency is improved; by adding a modified combined suspended filler, the film culturing efficiency of the filler is improved. The invention also discloses a method for treating domestic sewage by using the domestic sewage treatment system, biochemical treatment is carried out in the whole process, no chemical is added, and secondary pollution is reduced.

The invention discloses an electrolytic manganese wastewater ion exchange treatment system adopting aeration type ion exchange devices. The electrolytic manganese wastewater ion exchange treatment system is characterized in that a wastewater storage pond (4) is connected with lower liquid feeding and discharging holes of an ion exchanger A (1) and an ion exchanger B (2) respectively; a regeneration liquid preparation pond (3) is connected with upper liquid feeding and discharging holes of the ion exchanger A (1) and the ion exchanger B (2) respectively; a valve is arranged on a pipeline; both the ion exchanger A (1) and the ion exchanger B (2) are the full-contact aeration type ion exchange devices. The electrolytic manganese wastewater ion exchange treatment system has the beneficial effects that the system operating efficiency is improved, the continuous adsorption of equipment is ensured, a process is realized by controlling the valve to be opened and closed, a control process is simple and stable, a control mode is simple and easy to operate, the adjustment is quick, and the outlet water quality can meet the standard; the full-contact aeration type ion exchange devices are adopted, so that resin can be in full contact with water to be treated and full adsorption is ensured.

The invention discloses an electrolytic manganese waste water ion exchange treatment system under automatic control in a whole process and adopting an aeration type ion exchange device. The electrolytic manganese waste water ion exchange treatment system is characterized in that a waste water storage tank (4) is respectively connected with lower liquid inlets / outlets of an ion exchange A(1) and an ion exchange B(2), a regenerated liquid preparation tank (3) is respectively connected with upper liquid inlets / outlets of the ion exchange A(1) and the ion exchange B(2), an electrically operated valve is arranged on a pipeline, the electrically operated valve is electrically connected with a PLC (programmable logic controller), and the ion exchange A(1) and the ion exchange B(2) are both full contact aeration ion exchange devices. The electrolytic manganese waste water ion exchange treatment system has the beneficial effects that the PLC controls the program to perform automatic operation in the whole process, automation degree of equipment is improved, and the operating efficiency of the system is improved; two ion exchanges which are arranged in parallel guarantee continuous adsorption of the equipment; the full contact aeration ion exchange devices are adopted to ensure that resin comes into full contact with water to be treated to guarantee full adsorption.

The invention discloses a new anaerobic reactor for treating landfill leachate wastewater. The new anaerobic reactor for treating landfill leachate wastewater comprises an anaerobic reactor and a computer full-automatic monitoring system, wherein the computer full-automatic monitoring system is in control connection with the anaerobic reactor, the temperature and flow rate of the anaerobic reactorduring the operation process are both controlled through the computer full-automatic monitoring system, and the anaerobic reactor comprises a water inlet pipe, a steel structure tank, a water-distributing sand-settling plate, a steel structure platform, a first-layer guide plate separator, a second-layer guide plate separator, a first-layer guide plate separator biogas lift pipe, an internal circulation return pipe, a biogas dehydrator, a second-layer guide plate separator biogas lift pipe, a water outlet pipe, an outer circulation pipe and a sand discharge pipe. Water is distributed by usinga swirling tangential line to reduce dead zones and short flows of the operation of the anaerobic reactor; the biochemical reaction of wastewater and anaerobic microorganisms is increased; the two layers of the guide plate separators are arranged, to increase the sludge interception and further improve the collection efficiency of biogas; the operational efficiency of the anaerobic reactor is enhanced.

The invention discloses a nitrogen and phosphorus removal treatment method based on an MBBR (moving bed biofilm reactor) technology, and belongs to the field of wastewater treatment. In the method, apre-anoxic zone, an anaerobic zone, a first anoxic zone, a second anoxic zone, an MBBR aerobic zone, a low dissolved oxygen zone and a rear anoxic internal reflux zone are included, wherein the anaerobic zone is communicated with the first anoxic zone through an upper part rectangular water through hole in the middle of a partition wall between the anaerobic zone and the first anoxic zone; the first anoxic zone is communicated with the second anoxic zone through a lower part rectangular water through hole in one side end of a partition wall between the first anoxic zone and the second anoxic zone; the second anoxic zone is communicated with the MBBR aerobic zone through an upper part rectangular water through hole in the outer side end of a partition wall between the second anoxic zone andthe MBBR aerobic zone; the MBBR aerobic zone is communicated with the low dissolved oxygen zone through a plurality of groups of parallel circular water holes with the upper parts being submerged inmuddy water in one end side of a partition wall between the MBBR aerobic zone and the low dissolved oxygen zone. The method overcomes the defect of insufficient effect in terms of advanced nitrogen removal in the existing traditional technology, and can be applied to the construction of nitrogen removal treatment facilities for wastewater.

The invention discloses a push-flow electrochemical water softening method and a push-flow electrochemical water softening device. Anode electrodes and cathode electrodes are sequentially and vertically installed in an electrochemical reactor in an alternate way; a plurality of electrode chambers are formed by the anode electrodes and the cathode electrodes which are arranged up and down in a staggered way; a water through channel is reserved in the bottom of each anode electrode or each cathode electrode and is communicated with the bottom of the electrode chamber adjacent to the water through channel; another water through channel is reserved in the top of each anode electrode or each cathode electrode and is communicated with the top of the electrode chamber adjacent to the water through channel; the bottom water through channels and the top water through channels are arranged in an alternate way. The method comprises two alternate operation steps: water softening stage: enabling hard water to pass through the electrochemical reactor, promoting water electrolysis by using direct current, respectively generating CaCO3 and Mg(OH)2 and depositing same on the surfaces of the cathodeelectrodes so as to remove hard ions in the water; cathode electrode descaling stage: introducing air into the electrochemical reactor, descaling the cathode electrodes by using the shear force generated by bubble breakage, and discharging the removed precipitate from a sludge outlet. The method and the device are suitable for softening industrial circulating water of industries such as electricpower, petroleum as well as heating and ventilation.

The invention discloses a floating water inlet folded plate rotary ecological dam and belongs to the fields of ecological engineering, environmental engineering and agricultural non-point source pollution control engineering. The ecological dam is constructed in a rice field drainage channel system and used for intercepting rice field recession, removing nutrient salt such as nitrogen and phosphorus in the recession, preventing the recession from being discharged into natural water, relieving surface water body non-point source pollution load, repairing a channel system ecological system and improving the water quality of farmland recession receiving water. The floating water inlet folded plate rotary ecological dam comprises a first matrix chamber, a second matrix chamber, a third matrixchamber, a fourth matrix chamber, a fifth matrix chamber, a sixth matrix chamber, a seventh matrix chamber, an eighth matrix chamber and a dam body arranged outside the dam. The invention provides a floating water inlet folded plate rotary ecological dam which is applied to a rice field drainage channel system and structurally can achieve automatic upper-layer water taking, improve the hydraulic condition, facilitate matrix replacement and enhance the nitrogen and phosphorus removal capacity.

The invention discloses a fast infiltration system used for rural sewage treatment. The system is composed of an upper layer and a lower layer, wherein a lower-layer tank body is composed of a gratingditch, an oil removal sedimentation tank, an adjusting tank and a water outlet tank, an upper-layer tank body is a fast infiltration tank, the fast infiltration system used for rural sewage treatmentis further provided with an external fan, the fast infiltration tank comprises a water collection layer and a plurality of infiltration layers from bottom to top, the water collection layer comprisesa water gathering layer, a middle bearing board and a dephosphorization layer from bottom to top in sequence, the water gathering layer is connected with a water outlet tank through a water gatheringpipe, the infiltration layers comprise bottom bearing boards, lower infiltration layers, transition layers and fast filtering layers from bottom to top in sequence, air distributing pipes are arranged on the lower infiltration layers, each air distributing pipe is connected with an air distribution header pipe, an air source is from the external fan, water distribution pipes are arranged on the fast filtering layers, and each water distribution pipe is connected with a water distribution header pipe; a reflux pump is arranged in the water outlet tank. By means of the fast infiltration systemused for rural sewage treatment, the concentration of pollutants which enter the fast infiltration tank is reduced, sewage short flows, orifice blocking and filler hardening are reduced, and maintenance workloads of workers are reduced.

The invention relates to a method for preparing a cigarette dual-fiber hybrid filter tip by utilizing soybean fibers, and the method comprises the following steps of: disentangling and stretching a soybean fiber bundle, eliminating surface static electricity and reducing curling and winding of the fibers; forming the surface wet soybean fibers and cellulose acetate fibers in a ratio of 4:1 into tows, and evenly mixing the two fibers; transversely stentering the evenly mixed tow, drawing till no obvious lamination, and evenly applying a plasticizer to the surface; fabricating a cigarette filter stick by means of a filter stick forming machine, and then cutting the filter stick into filter tips for wrapping cigarettes. Compared with the prior art, the filter tip prepared by the method provided by the invention is even in voids, and is good in effect of capturing granule-phase and gaseous-phase particles and larger in fiber absorption surface; the soybean fibers adopted in the invention belong to regenerable plant fibers and can be easily and biologically degraded under natural conditions. The soybean fiber-acetate fiber hybrid filter tip can be used for providing a new technical way for cigarette production while keeping the quality of cigarette smoking unchanged and reducing the harm of cigarette smoking.

The invention relates to the technical field of water treatment, in particular to a membrane chemical reactor, a water treatment system and a water treatment method. The membrane chemical reactor comprises a main body, a water guide assembly and a membrane assembly, wherein the water guide assembly comprises a plurality of first water guide plates and a plurality of second water guide plates, and the plurality of first water guide plates and the plurality of second water guide plates are sequentially accommodated in a membrane tank at intervals, are arranged in a staggered manner and jointly form a snakelike first flow guide channel; the membrane assembly comprises a membrane box, a plurality of first membranes and a plurality of second membranes; the plurality of first membranes and the plurality of second membranes are sequentially accommodated in the membranes tank at intervals, are arranged in a staggered manner, and jointly form a snakelike second flow guide channel; and two ends of the first flow guide channel are respectively communicated with a water inlet and the second flow guide channel, and the membrane tank is communicated with the water outlet. Therefore, by means of the arrangement mode, the water flow state can be improved, the good pollution control effect is achieved, the chemical cleaning time is prolonged, and then stable and efficient operation can be achieved.

The invention discloses a vertical turning flow bioretention pond, belongs to the field of municipal engineering, and provides a bioretention pond device capable of autonomously changing the oxygen-containing condition of rainwater, retaining and storing the rainwater and reducing suspended solids, nitrogen, phosphorus and organic matters in the initial rainwater. The vertical turning flow bioretention pond comprises a front tank wall, a rear tank wall, a left tank wall, a right tank wall, a tank bottom plate, a breather pipe, a left bottom partition plate, a right bottom partition plate, an overflow partition plate, a water passing vertical partition plate and a water distribution transverse partition plate. According to the vertical turning flow bioretention pond, an aerobic trickling filtration area is formed through the breather pipe and the water distribution transverse partition plate, so that the nitration effect of ammonium nitrogen is enhanced; through the water passing vertical partition plate and the overflow partition plate, firstly, a waterflooding anoxic saturation area is formed, and the denitrification effect of nitrate nitrogen is enhanced; a rainwater flowing path forms baffling, and the hydraulic retention time is prolonged; and thirdly, the rainwater retention capacity of the vertical turning flow bioretention pond is enhanced, the moisture required by life activities of plants and microorganisms is ensured, the biomass and activity of the plants and the microorganisms are improved, and the biological treatment capacity of the vertical turning flow bioretention pond is enhanced.

The invention belongs to the technical field of sewage treatment or river ecological restoration, and particularly relates to a modular combined constructed wetland. The modular combined constructed wetland comprises a plurality of wetland blocks which are connected in series through water distribution channels, each water distribution channel is connected with a main water distribution channel through a gate valve, and perforated walls are arranged at the joints of the water distribution channels and the wetland blocks. Sewage enters a first water distribution channel through the main water distribution channel after being pretreated, is uniformly distributed to a first wetland block, is collected by a second water distribution channel after being treated, is uniformly distributed to a second wetland block, and similar operations are conducted in turn until the sewage is treated by a fourth wetland block, is collected by a fifth water distribution channel and then is discharged. Under the same constructed wetland area, after the constructed wetland is divided into four same modules to be combined, compared with an original constructed wetland, the maintenance cost is saved by 70% or more, and the short-flow phenomenon is obviously reduced due to the effect of multiple times of water distribution.

The invention provides a method for optimizing a structure of an integrated domestic sewage treatment device, and the method can be used for improving the decontamination effect. The method comprises the following steps of: S1, generating a grid file corresponding to the integrated domestic sewage treatment device according to a preset simulation condition; S2, carrying out iterative solution on the generated grid file according to a preset solution parameter so as to simulate a flow state in the device and then obtain cloud charts and vector diagrams of a speed and a pressure under the current simulation condition; S3, setting a plurality of groups of different simulation conditions, and repeating the steps S1 and S2 to obtain the cloud charts and vector diagrams of speeds and pressures under different simulation conditions; and S4, analyzing and comparing the obtained cloud charts and vector diagrams of the speeds and pressures under different simulation conditions, and selecting a simulation condition corresponding to an optimum flow state mixing effect, wherein flow state mixing effect is represented by the cloud charts and vector diagrams of the speeds and pressures. The method provided by the invention is suitable for the technical field of environmental engineering.