37results about How to "To achieve the effect of purifying water quality" patented technology

The invention discloses a composite microbial bacterium adsorbent and a preparation method thereof and a sewage treatment method. The composite microbial bacterium adsorbent comprises a composite carrier and composite microbial bacteria, wherein the composite carrier comprises sodium alginate, molasses, diatomite, micron-sized activated carbon and shell powder. The preparation method comprises thefollowing steps: using the sodium alginate, the molasses, the diatomite, the micron-sized activated carbon and the shell powder as the composite carrier, and then loading the composite microbial bacteria onto the composite carrier in an immobilizing manner to obtain the composite microbial bacterium adsorbent. The content and the survival rate of the microbial bacteria in the adsorbent are increased, and the effective survival time thereof is prolonged; when applied to sewage treatment, the composite microbial bacterium adsorbent can effectively degrade harmful substances, such as nitrite, ammonia nitrogen and hydrogen sulfide, in sewage, so as to achieve the effect of purifying water.

The invention discloses a suspension filler for water treatment. The suspension filler comprises a supporting frame and a carbon filer bundle having two ends fixed on the supporting frame, the carbon fiber bundle comprises an inner-layer carbon fiber bundle and an outer-layer carbon fiber bundle, the supporting frame comprises a first annular frame, a second annular frame and a third annular, and the first, second and third annular frames are arranged in a mutual intersection manner. The inner-layer carbon fiber bundle substantially flutters in the supporting frame, the outer-layer carbon fiber bundle slightly flutters, and microbes and dirty substances in wastewater can be adhered and adsorbed to the suspension filler; the suspension filler for water treatment adopting the first, second and third annular frames to form the supporting frame can fully utilize the power of water flow and airflow to realize buoyancy motion, so the suspension filler for water treatment combines excellent material performances comprising high adsorption performance, high biological endophilicity and the like of the carbon fiber material with the optimized designs of the structure of the supporting frame, the inner-layer carbon fiber bundle and the outer-layer carbon fiber bundle, thereby the comprehensive performances of the obtained suspension filler are very good.

The invention relates to the field of fishing tools, and specifically relates to a fishing net with an anti-corrosion property. The fishing net comprises the following raw materials: fluorocarbon resin, epoxy resin, acrylonitrile butadiene rubber, sodium hydroxide, iron oxide, zinc oxide, calcium carbonate, polyethylene and a bactericide. The fishing net with the anti-corrosion property provided by the invention has the following advantages: phenolic resin and polytetrafluoroethylene are added into the raw materials, so that anti-corrosion property of the fishing net can be improved; meanwhile, a plasticizer and a wetting agent are added into the raw materials, so that tautness and quality of the fishing net can be enhanced; and zeolite powder is added into the raw materials, so that a water purifying effect can be achieved, and pollution to river water due to operation of the fishing net is reduced.

The invention relates to a method for ecology restoration and water quality maintenance of a city landscape water body by adopting reclaimed water as supply. According to the method, a composite type plant ecology system comprising two parts of an ecology bank revetment and a composite type ecology floating island is constructed, and an artificial regulation system is adopted to regulate a landscape water body, wherein the ecology bank revetment comprises a vegetation soil slope type bank revetment, a vegetation tile type bank revetment and a wetland type ecology bank revetment; bank revetments on both sides of the landscape water body are provided with multiple groups of composite type ecology floating islands, wherein each group of the composite type ecology floating islands is formed by connecting a plurality of floating island monomers, and the lower parts of each group of the composite type ecology floating islands are suspended with ecology grasses; the artificial regulation system comprises three parts of water supply regulation, water body disturbance / oxygen increase regulation and aquatic animal regulation. The method of the present invention is applicable for landscape water bodies adopting reclaimed water as a supply water source, wherein the reclaimed water meets requirements of "The reuse of urban recycling water-Water quality standard for scenic environment use". With the method of the present invention, natural ecology system construction and artificial regulation are combined, self-purification capacity of water bodies can be effectively enhanced, and landscape function of water bodies can be maintained.

The invention discloses a culture tail water treatment system which comprises a primary settling zone, an enhanced settling zone, a biological purification zone and an effluent storage zone, the primary settling zone is used for collecting culture tail water discharged from a seawater pond; the enhanced settling zone comprises a reservoir, a water separation dam and filter dams, the reservoir is divided into a plurality of settling ponds which are arranged side by side in the left-right direction by the water separation dam, the settling ponds on the left side are used for collecting culture tail water subjected to preliminary settling, every two adjacent settling ponds are communicated through the corresponding filter dam, and the settling pond on the right side is communicated with the biological purification zone through the corresponding filter dam; the biological purification zone comprises an animal breeding purification pond and a first plant purification wetland, the animal breeding purification pond is communicated with the sedimentation pond located on the right side through a filter dam, and the animal breeding purification pond is communicated with the effluent storage area through the first plant purification wetland. When the culture tail water is treated, the structure and function of the seawater pond are not changed, the process is advanced, the technology is reliable, economical and reasonable, manufacturing cost and operation cost are low, and management and maintenance are convenient.

The invention discloses a double-face water treatment filter material device, comprising a filter core (1), a sealing connecting piece (3) and a bolt sealing ring (5); the bolt sealing ring (5) is sleeved on top of a bolt (7) and traverses a middle hole of the filter core (1) which has bonded the connecting piece, a support member (4) is sleeved in the bolt and fixed at inner side of the filter core (1); another filter core (2) traverses the bolt (7) to be disposed at the other face of the sealing connecting piece (3) and to be bonded symmetrically with glue, another bolt sealing ring (6) is sleeved at the lower end of the bolt (7) and tightly adhered to outer side of the filter core (2) and locked by a lock nut (9), such that a sealing cavity with an opening at the lower end is formed; when in operation, the water enters into the cavity from both sides of the filter cores (1), (2) and passes through the hole channel of the support member (4), a perforation (8), and eventually flows out from an opening end (9) at the lower part of the bolt (7), thus purifying the water.

The invention provides an ecological filtered water treatment system and a manufacturing method thereof. The ecological filtered water treatment system comprises a first water filter tank, an artificial wetland zone, a second water filter tank, filler layers and a planting frame. The filler layers are arranged at the bottom of the first water filter tank and the bottom of the second water filter tank respectively, aquatic plants are planted in the filler layers, and the aquatic plants can absorb and decompose elements such as nitrogen and phosphorus and other pollutants in water, so that the effect of purifying water is achieved. Furthermore, wetland plants are planted in the constructed wetland zone, and terrestrial plants are planted in the planting frame, so that the biological diversity in the ecological filtered water treatment system can be improved, the sewage purification efficiency is improved, and meanwhile, the ecological stability in the ecological filtered water treatment system is improved. In addition, the planting frame is arranged in the opening direction of the second water filter tank, and the constructed wetland zone is a vertical constructed wetland zone, so that the occupied area of plant planting can be greatly reduced.

The invention discloses quick-washing and quick-drying textile non-woven fabric processing equipment. The equipment comprises a drying box and a cleaning box fixedly connected with the bottom of the drying box; an upper drying device and a lower drying device are sequentially arranged in the drying box from top to bottom; the upper drying device comprises a front set of first side plates and a rear set of first side plates which are symmetrically arranged. The invention relates to the technical field of fabric processing equipment. According to the quick-washing and quick-drying textile non-woven fabric processing equipment, the upper drying device and the lower drying device are longitudinally distributed; when a fabric passes through the drying devices, most of water in the fabric can be squeezed out through a water squeezing wheel, then the water in the fabric can be blown out through hot air blown downwards by a hot air circulating device, and meanwhile the drying effect is achieved; when the fabric passes through an ironing water tank, the fabric can be ironed by utilizing the temperature of the ironing water tank; the fabric can be ironed to be flat while being further heated, and the surface quality of the fabric can be improved while the fabric is rapidly dried; and the structure is compact, and the operation is coherent.

The invention discloses a composite filter element for a refrigerator and the refrigerator with the composite filter element. The composite filter element comprises a shell and a filter element component, a water inlet and a water outlet are formed in the shell, the filter element component is arranged in the shell and separates the water inlet and the water outlet, a first water passage is defined on the inner side of the filter element component, a second water passage is defined between the outer side of the filter element component and the shell, one of the first water passage and the second water passage is communicated with the water inlet, the other one of the first water passage and the second water passage is communicated with the water outlet, and the filter element component comprises a carbon rod and a nanofiber layer which are stacked along a water flow direction from the water inlet to the water outlet. According to the composite filter element for the refrigerator, water can be purified, and the purified water meeting direct drinking standards is automatically and timely provided for an ice-making system of the refrigerator. Besides, the composite filter element has a sterilizing function by the aid of the nanofiber layer, secondary pollution is prevented, and the problems of bacteria breeding and standard exceeding of the composite filter element are solved.

The invention discloses an ozone-ultra-micron air bubble-filtering system and an ozone-ultra-micron air bubble-filtering method. Domestic sewage is treated by utilizing an ozone-ultra-micron air bubble-filtering process, and is treated according to a water quality condition of the domestic sewage through changing an adding quantity of ozone and hydraulic retention time; according to water quality properties of the domestic sewage, a certain quantity of the ozone needs to be added before ultra-micron air bubbles to remove part of organic matters, improve dissolved oxygen and remove odor when the sewage is treated under the conditions that the sewage contains a lot of organic matters, the dissolved oxygen is low, a water body is odorous and the like; if the sewage contains a few of the organic matters and the water body is not odorous, predicated emission standards can be reached through an ultra-micron air bubble and filtering process. By combining the ozone oxidized organic matters, the ultra-micron air bubbles and a filtering process are combined to treat the domestic sewage, so that the treatment of the domestic sewage has pertinence and the removing effect of suspension matters and the organic matters is obvious.

The invention discloses a composite microbial bacterium adsorbent, a preparation method thereof, and a sewage treatment method. The composite microbial bacterium adsorbent includes a composite carrier and a composite microbial bacterium, and the composite carrier includes sodium alginate, molasses, diatomaceous earth, micron Grade activated carbon and shell powder. The present invention uses sodium alginate, molasses, diatomite, micron activated carbon and shell powder as a composite carrier, and then solidifies and loads the composite microbial bacteria on the composite carrier to make a composite microbial adsorbent, which improves the microbial efficiency in the adsorbent. When used to treat sewage, it can effectively degrade harmful substances such as nitrite, ammonia nitrogen, and hydrogen sulfide in sewage, and achieve the effect of purifying water quality.

The invention discloses a filter tower, a filter is arranged in the filter tower, a spray pipe connected with a water inlet pipe is horizontally arranged above the filter, and the lower end of the filter tower is connected with a drain pipe. When the filter tower works, water which needs to be purified can be pumped and sent to the spray pipe of the filter tower through a water pump, sprayed and then filtered by multiple layers of filter screens and multiple non-woven cotton filter layers of the filter, then the clean water returns into a water pond via the drain pipe, and the effect of purifying the water quality can be achieved by repeating the operation multiple times; when the water quality becomes poor, the work is repeated; therefore, the water containing impurities can be purified, the blockage of a small hole in a water cooling roller of a printing machine can be avoided, the maintenance workload can be further reduced and the water consumption can be saved.

The invention relates to the field of fishing gears and particularly relates to a fishing net with environment protection efficiency. The fishing net with environment protection efficiency is produced from the following raw materials: epoxy resin, nitrile rubber, ethyl dioxide, barium stearate, rosin, zinc oxide, a plasticizer, an antioxidant and zeolite powder. According to the fishing net with environment protection efficiency, ethyl dioxide and barium stearate are used in the material, so that influences of the fishing net to the environment are reduced, and meanwhile the tensile strength of the fishing net is also improved; meanwhile, the plasticizer and the antioxidant are added into the material, so that the tightness and quality of the fishing net can be improved; and the zeolite powder is added into the material, so that the effect of purifying water quality can be achieved, and the pollution of the fishing gear to river water during operation is reduced.

The invention relates to the technical field of water treatment, in particular to a microbial preparation and an aquaculture water purification method. The microbial preparation comprises a composite bacterial fixing agent and a ferrous stabilizer, the preparation method of the composite bacterial fixing agent comprises the following steps: (1) adding a composite carrier into water and stirring to obtain a premixed solution, and the composite carrier comprises sodium alginate, zeolite powder and CaCO3; (2) adding a compound bacteria solution into the premixed solution, and stirring and mixing to obtain a mixed solution; (3) dropwise adding the mixed solution into a CaCl2 solution, and standing for crosslinking to obtain gel balls; and (4) washing the gel balls to obtain the composite bacteria fixing agent. The ferrous stabilizer is activated carbon loaded with ferrous particles. The aquaculture water purification method adopts the microbial preparation to reduce the nitrite and / or nitrate content of the aquaculture water. The microbial preparation and the aquaculture water body purification method can obtain a faster and more efficient nitrite degradation rate.

The invention relates to a young macrobrachium rosenbergii anti-stress splashing agent and a preparation method thereof, and belongs to the technical field of a compound feed for aquatic products. Thepreparation method comprises the following steps of taking a Chinese gall extract, a rheum officinale extract, a horseradish tree seed extraction mixture, chromium methionine, ferrous glycine, vitamin E, vitamin C, glucose and the like; and sufficiently mixing the components, and performing crushing so as to obtain dry powder. According to the young macrobrachium rosenbergii anti-stress splashingagent and the preparation method thereof disclosed by the invention, raw material sources are stable, and the young macrobrachium rosenbergii anti-stress splashing agent is simple to prepare, extensive in material taking and suitable for large-scale production; and the anti-stress splashing preparation disclosed by the invention can directly remove free radicals in organisms, eliminate negative influence of the free radicals on normal functions of tissues and organs of the organisms, increase the speed of repairing the broken immune system, retard reactions of the organisms to stress conditions, enhance immunity, enhance stress resistance, reduce the generation of diseases and increase the survival rate.

The invention discloses an efficient solar water-saving water purification system. The system comprises a water tank; a frame is fixedly connected to the bottom surface of the water tank; a heating box is fixedly inlaid in the upper surface of the frame; the bottom of the right side surface of the water tank is provided with a water tank water outlet; the top of the left side surface of the heating tank is provided with a heating tank water inlet; a communicating pipe is arranged on the upper surface of the frame; and the left end of the communicating pipe is fixedly communicated with the water tank water outlet. The efficient solar water-saving water purification system has the advantages that a base is arranged, under the action of a rolling bearing and a rolling shaft, a solar panel setcan be rotated along with the rotation of the sun, so that a better lighting effect is achieved, a limiting block is arranged, under the action of a sliding rail, the solar panel set can be fixed atthe best lighting position, so that the conversion efficiency of solar energy is improved, a heating box is arranged, under the action of a heating layer and a heat preservation layer, water can be rapidly and effectively heated, and therefore the effect of high-temperature sterilization is realized.

The invention discloses a rainwater conservation purifying and repairing system. The structure of the rainwater conservation purifying and repairing system comprises a fixing mechanism, a rainwater conservation purifying device, a rainwater collecting mechanism and a seal ring, wherein the upper surface of the fixing mechanism is welded to the lower surface of the rainwater conservation purifyingdevice and is vertical to the lower surface of the rainwater conservation purifying device, the upper surface of the rainwater conservation purifying device is welded to the lower surface of the rainwater collecting mechanism and is vertical to the lower surface of the rainwater collecting mechanism, the upper surface of the fixing mechanism is parallel to the lower surface of the rainwater collecting mechanism, the left end of the seal ring is mounted at the right end of the rainwater conservation purifying device in an embedding manner, and the rainwater conservation purifying device comprises a vertical flow-dividing mechanism, a large particle filtering mechanism, a self-induction overflow mechanism, an ecological water body mechanism, an odor-removing and water-draining mechanism andan outer barrel. For the rainwater conservation purifying and repairing system provided by the invention, according to the design, the bioremediation method is adopted for repairing and purifying thecollected rainwater, while zero pollution is realized, the water quality is improved, and thus the application range of the system is expanded.

The invention discloses an aquatic ecosystem construction device which comprises submerged plants, a planting bed, a buoyancy fish nest, a fixing rope and an anchoring pier which are sequentially arranged from top to bottom, wherein the buoyancy fish nest is fixed to the anchoring pier through the fixing rope, the planting bed is arranged at the top end of the buoyancy fish nest, the submerged plants are planted in the planting bed, and fish inlet holes are formed in the anchoring pier and the buoyancy fish nest. Compared with the prior art, the submerged plants on the planting bed are made to float in water through the buoyancy fish nest, the depth of the planting bed sinking into the water is adjusted through the fixing rope, the buoyancy fish nest and the anchoring pier provide habitats of different water depths for fishes, and the anchoring pier provides a fixing fulcrum for the whole device while providing the habitats for demersal fishes. The aquatic ecosystem constructed by the invention is suitable for water areas with larger water depth, particularly suitable for deeper frozen water areas with damaged fish habitats, and can effectively improve the water ecological environment of the water areas.

The invention discloses an ecological circulation type aquatic and plant circulation symbiosis system. A seedbed is placed on the top, and the seedbed is located on the side of the installation seat close to the fish tank, the seedbed is provided with a tea tray, and the tea tray is fixed on the top of the seedbed, and the bottom inner wall of the seedbed is provided with a filter cover, and the filter cover is cup-shaped Structure, the filter cover is located on one side of the seedbed, and the filter cover is located below the tea tray, the interior of the filter cover is provided with a golden bell, and the top of the golden bell is provided with a pipe cap plug. The invention perfectly combines the aesthetics of the fish tank, the practicability of the tea tray and the ornamental value of the landscape, and realizes the ecological cycle-type aquatic and plant cyclic symbiosis system. When it comes to fish farming, no care is taken.

The invention discloses a flow guide wall device, a water quality purification treatment system and a method thereof. The flow guide wall device comprises a framework assembly and a filling assembly.A gap is formed in the side wall of the framework assembly, the framework assembly is further provided with an accommodating groove communicated with the gap, and the filling assembly comprises a filter layer and a phosphorus removal filter material layer. The filter layer and the phosphorus removal filter material layer are both arranged in the accommodating groove, and the phosphorus removal filter material layer is positioned on the upper part. The water quality purification treatment system comprises a plurality of flow guide wall devices, and the flow guide wall devices are arranged on revetments on the two sides in the water flow direction of a to-be-treated water area at intervals so that water flows circuitously. According to the flow guide wall device, the water quality environment state does not need to be changed manually, the purification efficiency is high, and when sewage in a to-be-treated water area flows through the framework structure, the purpose of nitrogen and phosphorus removal is achieved in a biophysical combination mode. The flow guide wall device can achieve the purposes of no energy consumption, high purification rate, wide application range and multifunctional phosphorus element reduction measures.

The invention discloses a suspension filler for water treatment. The suspension filler comprises a supporting frame and a carbon filer bundle having two ends fixed on the supporting frame, the carbon fiber bundle comprises an inner-layer carbon fiber bundle and an outer-layer carbon fiber bundle, the supporting frame comprises a first annular frame, a second annular frame and a third annular, and the first, second and third annular frames are arranged in a mutual intersection manner. The inner-layer carbon fiber bundle substantially flutters in the supporting frame, the outer-layer carbon fiber bundle slightly flutters, and microbes and dirty substances in wastewater can be adhered and adsorbed to the suspension filler; the suspension filler for water treatment adopting the first, second and third annular frames to form the supporting frame can fully utilize the power of water flow and airflow to realize buoyancy motion, so the suspension filler for water treatment combines excellent material performances comprising high adsorption performance, high biological endophilicity and the like of the carbon fiber material with the optimized designs of the structure of the supporting frame, the inner-layer carbon fiber bundle and the outer-layer carbon fiber bundle, thereby the comprehensive performances of the obtained suspension filler are very good.

The invention provides a preparation method for treating and recycling coal tar hydrogenation wastewater. The preparation method for treating and recycling the coal tar hydrogenation wastewater comprises the steps of S1, deoiling the coal tar hydrogenation wastewater; (1) discharging oil-containing wastewater into a sewage treatment tank for centralized treatment; and (2) preparing treatment and purification equipment, namely, a sewage adjusting tank, wherein the sewage adjusting tank is divided into an outer tank and an inner tank, the sewage adjusting tank is internally provided with a cavity of a hydraulic cyclone separation area and a cavity of a precipitation separation area, and the cavity of the precipitation separation area is the inner tank. The preparation method for treating and recycling the coal tar hydrogenation wastewater, provided by the invention, has the advantages that the operation is simple, oil and acid in the wastewater can be separately treated, the wastewater treatment effect can be enhanced, and part of resources can be recycled.

The invention relates to an ecological pond lotus water purification system, and relates to the field of municipal water purification engineering. The ecological pond lotus water purification system comprises a plurality of purification tanks arranged in a water flow channel, the heights of the plurality of purification tanks are sequentially reduced, and aquatic plants are planted in the purification tanks. The tank walls, facing the lower side, of each purification tank comprise a first tank wall formed by pouring concrete and a second tank wall formed by piling stones or bricks, and the second tank wall is located on the lower side of the first tank wall. According to the invention, the water purification effect can be effectively optimized.

The invention discloses an environment-friendly vacuum pump system. The system comprises a common skid-mounted base and a purified water cooling water tank, wherein the purified water cooling water tank is installed on the outer wall of the upper end of the common skid-mounted base, and a purified water tank and a sediment water tank are organically combined with a circulating water pump through avacuum water pump to achieve the effect of purifying water; and then the primary raw water formed by mixing low molecules or water vapor and the like released by an extruder or a granulator materialin a hot melting state is pretreated by a filtering and purifying system in a raw water purifying water tank, so that secondary raw water is formed after pretreatment; the secondary raw water is purified by four purification channels to form purified water; the purified water is cooled by a purified water cooling water tank, and the purified water with higher temperature is cooled to normal temperature; and finally, the purified water flows into a purified water cooling water tank through a circulating water pipe and is used as circulating water of a vacuum water pump, so that the repeated closed-loop use effect is achieved. The technical scheme is convenient for cyclic utilization, and the treated circulating water is free of any pollution and has important environmental protection significance.

The invention discloses a composite microbial preparation and application of the same in treatment of water body with algal bloom. The composite microbial preparation comprises algicidal bacteria, a viscous bacterium and water-purifying bacteria, wherein the algicidal bacteria comprise enterobacterium and / or bacillus subtilis, the viscous bacterium is bacillus mucilaginosus, and the water-purifying bacteria comprise a photosynthetic bacterium and / or a nitrite bacterium. A preparation method for the composite microbial preparation comprises a first step of separately culturing each bacterium and a second step of culturing all the bacteria mixed in proportion. The invention has the following advantages: separate culturing enables each bacterium to grow in a most effective way, and application of a mixture of the separately cultured bacteria gives full play to effect of each bacterium in the alga-controlling composite microbial preparation; the composite microbial preparation can effectively overcome the problem of debated algicidal effect caused by current impact on the bacteria and achieves alga-removing effect as well as water purifying effect, especially a removal effect on elemental nitrogen in the water body; and a breakthrough is made to the limitation that a traditional microbial preparation is only applicable to a hydrostatic water body with a small area, and the composite microbial preparation is applicable to rivers, lakes and regenerated water bodies.

The invention discloses an algae harvesting method taking modified chitosan as a flocculant. The method comprises the following steps: firstly, modifying chitosan to obtain a guanidine chitosan flocculant, and then adding the guanidine chitosan flocculant to a micro algae culture solution, so that the concentration of the guanidine chitosan flocculant in the micro algae culture solution is 2-100mg / L, stirring for 5-10 minutes, standing and participating for 10-120 minutes; removing supernate, and harvesting the micro algae. The chitosan has a better flocculation effect after being modified in a guanidination manner, and can be applied to collection of micro algae after large-scale cultivation, and rapid treatment of a harmful algal body of leading to water eutrophication, and the algae harvesting method has the advantages of low cost, less investment, simple preparation technological condition, environment friendliness and the like.

The invention belongs to the technical field of sewage treatment, and particularly relates to a sludge concentration and dehydration system and a dehydration method thereof. The system is provided with a precipitation cone hopper on the lower side of a sludge concentration tank; a sludge delivery pipe for delivering sludge solution into the sludge concentration tank is arranged on the sludge concentration tank, a clean water discharge mechanism for discharging clean water to the exterior of the sludge concentration tank and a sludge discharge mechanism for discharging concentrated sludge to the exterior of the sludge concentration tank are also arranged on the sludge concentration tank; and the system also comprises a dissolved air floatation mechanism consisting of a dissolved air pump inlet pipe, a dissolved air pump, a buffer and a dissolved air water distributor. In the dehydration method, the sludge in the water continuously floats by the dissolved air technology of the dissolved air pump, so that the separated water becomes clean; and when air floatation is stopped and the clean water is discharged, the floating sludge naturally falls into the precipitation cone hopper and reaches the dehydration requirement. The dehydration effect of the dehydration system is good, the water content of the sludge can be furthest reduced, conditions are created for subsequent sludge dehydration and drying processes, and the operating costs of dehydration and drying are reduced.

The invention relates to an afforestation and soil preparation method for water conservation forest in north China, the method comprising following steps: (1) preliminary investigation of a selected water conservation forest area in north China; (2) forest land clearance in the water conservation forest area; (3) in the water conservation forest area, soil preparation with narrow horizontal strips and fish-scale pits along the contour line in an alternate form. According to the afforestation and soil preparation method, by performing investigation on the selection indexes of forest areas and performing soil preparation with narrow horizontal strips and fish-scale pits along the contour line in an alternate form, the soil porosity and infiltration capacity are increased so that soil and water conservation is achieved. The method can be applied under all kinds of terrain conditions. The method has following beneficial effects: small ground-breaking surface and small investment. By use of the method and in the long run, the differences in soil water distribution can be changed; the mechanism of selection through competition between individual vegetation can be promoted; stability and long effectiveness can be maintained; water and soil conservation and water purification can be achieved.

The invention provides a method for purifying domestic wastewater by using willows through super deep flow, which comprises the following steps: restoring eutrophic surface water through a super deep flow method by selecting red willows with excellent flooding tolerance; taking twigs of annual robust willows, and cutting into cutting slips with a length of 10-15cm; by taking a phenolic foam board as a carrier, planting the willow slips, and pre-culturing to accelerate rootage; transferring the willow seedlings into a tank containing domestic wastewater, wherein the contact area of the rhizospheres with the water body is enlarged through the deep and developed root systems of the red willows in combination with a super deep flow manner; and enabling a nutrient solution to circularly flow through a pump, thus increasing the oxygen supply to the rhizospheres. According to the red willow-based super deep flow method, nitrogen and phosphorus in a water body are effectively absorbed and purified, the wastewater treatment amount is increased, and the purification efficiency is improved. No secondary pollution is produced; and the aboveground biomass can be periodically harvested for wattling use, thus having high economic benefits and landscape effect.

The invention discloses a sewage treatment device capable of performing multi-stage filtration on sewage, relates to the technical field of sewage treatment, and aims to solve the problems that an existing sewage multi-stage treatment device generally needs to be provided with a plurality of tank bodies for conveying and guiding materials, so that multi-stage treatment measures can be completed, the overall occupied area of the device is large, and the treatment efficiency is low. The second-stage filtering mechanism is installed below the first-stage filtering mechanism and is in flange connection with the first-stage filtering mechanism through a flange plate, the number of the third-stage filtering mechanisms is four, and the four third-stage filtering mechanisms are mutually welded and connected and are all arranged below the second-stage filtering mechanism; the periphery of the lower surface of the second-stage filtering mechanism is fixedly connected with a third-stage filtering mechanism through a first bracket, the lower part of the third-stage filtering mechanism is fixedly connected with a temporary storage tank through a second bracket, and a feeding pipe is mounted at the upper end of the first-stage filtering mechanism.