316results about How to "Ensure sustainable development" patented technology

The invention discloses a lightweight wall plaster which comprises the following components by weight percent: 65-90% of inorganic cementing material, 5-30% of lightweight aggregate, 0-30% of filler and 0-10% of functional additive, wherein the inorganic cementing material is a desulfurized plaster or a building plaster. The lightweight wall plaster is a single-component dry mixed material produced by a factory and can be used on a construction site by only adding water for stirring, the lightweight wall plaster has a certain thermal insulation function and excellent fire prevention performance, the bonding performance is good, and the compressive strength is high, thereby being capable of replacing the traditional plastering mortar to be plastered on inner sides of external walls, partition walls, room separating walls, ceilings and other occasions and further improving the thermal insulation performance of wall bodies.

The invention discloses a traffic internet of things (IOT) layering system architecture based on information gathering. The layering system architecture provided by the invention comprises an entity physical layer, a network layer, a transmission layer, a foundation application layer and an information gathering layer. The layering system architecture provided by the invention is a height abstraction for various different physical networks, thus a uniform traffic IOT system architecture is provided for a plurality of traffic modes such as railways, waterways, highways and the like, and the transparence of the underlay network technology to an user or an application program can be achieved. According to the invention, an information system architecture which is uniform and cooperative and can provide uniform service is established, thus universal network service is provided for users; a fusion architecture is provided for the compatibility of various traffic IOT platforms; and a good foundation is laid for the compatibility of the existing traffic IOT and other region traffic IOT.

The invention discloses a recycled aggregate medium-dry hard concrete prepared by using building waste, which comprises the following raw materials of coarse aggregate, fine aggregate, a gelatinizing agent, a water reducing agent and water, wherein the gelatinizing agent comprises cement and coal ash, and the coarse aggregate comprises 50-100 percent of recycled coarse aggregate prepared from thebuilding waste. A preparation method of the recycled aggregate medium-dry hard concrete comprises the following steps of: pretreating the building waste, removing impurities, remaining waste concrete, waste bricks and the like; crushing and screening to prepare the recycled coarse aggregate; mixing the recycled coarse aggregate, natural sand, cement and water according to the proportion, adding the coal ash and the water reducing agent, stirring uniformly to obtain a mixture; and squeezing and forming the mixture, curing for 2 days to obtain the recycled aggregate medium-dry hard concrete. The invention solves the problems of worsening ecological environment and the like caused by difficulty in treating the building waste; and the building wastes are used for manufacturing the recycled aggregate for replacing natural aggregate, the increasingly deficient natural aggregate and damage degree to the ecological environment are reduced, and the living environment of human beings is protected. The recycled aggregate medium-dry hard concrete prepared by using the method has high strength and high abrasive resistance, and can be used for building base installations such as city roads, housing constructions and the like.

The invention relates to a white fast-setting, fast-hardening and high-belite sulphoaluminate cement clinker, and also relates to an application and a production technology thereof. The mineral component of the cement clinker comprises 0.5-4.6% of f-CaO; the chemical component of the cement clinker comprises 12.9-16.1wt% of SiO2, 12-19wt% of Al2O3, 0.15-1.0wt% of Fe2O3, 49-53wt% of CaO and 12-18.5wt% of SO3; and the clinker rate range Cm is 1.01-1.137, and P is 0.62-1.44. The clinker is produced through calcining 30-50wt% of limestone, 26-46wt% of slag powder and 21.1-40wt% of desulfurized gypsum in a rotary kiln at 1250-1350DEG C. 26-97% Of the clinker, 3-19% of anhydrite and 0-55% of the slag powder, or 5-25% of the clinker, 14.4-19.0% of the anhydrite and 55.8-79% of the slag powder are mixed and ground to form white fast-setting, fast-hardening and high-belite sulphoaluminate cement and high-late strength and high-belite sulphoaluminate cement.

The invention discloses a method for preparing a high-nickel concentrate from a low-grade red soil nickel ore, which comprises the following steps of: drying the low-grade red soil nickel ore until water content is 13 to 16 percent, crushing to ensure that the size of all particles is less than 3mm, grinding by using a high-pressure roller mill to ensure that particles with the size of less than 0.074mm account for 80 percent and specific surface area is not less than 2,000cm<2> / g, adding 15 to 20 percent of composite binder and 1 to 5 percent of coal powder, and pelletizing by using a disc pelletizer to obtain green pellets with the size of 6 to 16mm; drying and preheating the green pellets on a chain grate for water removal and solidification to ensure that each piece of pellet entering a kiln has the compression strength of over 500N; directly adding the preheated and solidified pellets into a rotary kiln, and reducing at the temperature of between 1,100 and 1,250 DEG C for 60 to 120 minutes by using pea coal as a reducing agent in a mass ratio of the reducing coal to the pellets of 0.8-1.0; and cooling a reduction product, sieving, performing magnetic separation to obtain a magnetic product, crushing, grinding, and performing magnetic separation to obtain the high-nickel concentrate, wherein the composite additive comprises the following components: Na2CO3 and CaO, iron oxide powder, the coal powder and sodium humate in a ratio of (30-60):(20-30):(20-30):(5-10). The method is high in adaptability and nickel recovery rate and suitable for mass production.

The invention discloses a continuous process for synthesizing oxamide, which belongs to the fields of catalysis, chemical industry, environmental protection and fertilizer. Coal-based synthesis gas is used to obtain H2≥99.0V% hydrogen and industrial CO through pressure swing adsorption separation technology; N2≥99.0V% nitrogen and industrial O2 are obtained through air through cryogenic separation technology. Use H2≥99.0v% hydrogen and N2≥99.0v% nitrogen to mix according to the ratio of N2:H2=1:3, and send them to the ammonia reaction tower to produce synthetic ammonia; industrial CO gas is sent to react with RONO gas after dehydrogenation, oxygen removal, and water removal The tower catalyzes the synthesis of oxalate, and the NO in the reaction tail gas is reacted with industrial O2 and an alcohol-water solution with an alcohol content of ≥10wt% to generate RONO for recycling; the synthesized oxalate and synthetic ammonia are directly sent to the reactor to synthesize oxamide, a slow-acting nitrogen fertilizer, Substituting urea or ammonium bicarbonate for agricultural and animal husbandry production has good economic and social benefits, and is an important development direction of C1 chemical and nitrogen fertilizer industries.

The invention discloses a sea bed nutrient lifting device and a method based on solar energy and wave energy. In the prior art, the sea bed nutrient lifting method is difficult to implement and has a high energy consumption. The device comprises a sea surface platform, underwater heat-insulating guide tubes and a sea bed heat-absorbing device, wherein the sea surface platform is formed by a top surface and a bottom surface, a compressible plastic heat-insulating water bag surrounds the sea surface platform to form closed space, a support plate is arranged at the middle of the closed space to divide the closed space into two chambers, the two chambers are communicated with each other, the underwater heat-insulating guide tubes are connected to the bottom surfaces of the chambers, and the two underwater heat-insulating guide tubes are communicated through the sea bed heat-absorbing device. Under the action of sea surface waves, the compressible plastic heat-insulating water bag pushes the upper-layer high-temperature sea water to flow into the lower-layer sea bed heat-absorbing device, resulting in heat exchange. The lower-layer sea water absorbs heat energy to lead to temperature rise and density drop and floats up under the action of buoyancy, so that the nutrient-enriched sea water deep in the sea is lifted up to the sea surface. The device and the method have the advantages of high efficiency and low energy consumption and are clean and environment-friendly.

The invention provides an environment-friendly method for culturing fish by using net cages and relates to a technique for culturing fish by using the net cages. In the method, one or more inner net cages are sleeved in an outer net cage; predatory fish is cultured in the inner net cages; and omnivorous fish, filter fish, or omnivorous fish and filter fish are cultured in the gap between the outer net cage and the inner net cages, wherein the omnivorous fish or the filter fish feed on residual baits and excreta of the predatory fish and animals and plants attached to meshes. By the method, water environmental pollution due to eutrophication of water environment caused by fish culture in the net cages is avoided; pollution-free fish culture is realized; utilization ratio of the bait is increased; breeding cost is reduced; and economical benefit is increased.

The invention discloses a method for preparing steel fiber rubber particle modified asphalt recycled aggregate concrete. In the method, waste concrete is subjected to crushing, separating, screening, washing and drying to obtain the recycled aggregate, and the recycled aggregate is stirred with emulsified asphalt until the emulsified asphalt is covered on the surface of the recycled aggregate; waste tire is subjected to coarse crushing, separating, washing and drying to obtain the steel fiber rubber particle; and the recycled aggregate containing the emulsified asphalt, steel fiber rubber particles, natural aggregate, cement, sand and water are stirred according to certain ratio to obtain the steel fiber rubber particle modified asphalt recycled aggregate concrete. In the invention, the waste tire is subjected to crushing process to produce the steel fiber rubber, and the crack resistance, the heat preservation capability and the energy absorption and noise reduction capability of the asphalt recycled aggregate concrete are effectively improved by the modification of the steel fiber rubber; and the material is a circular economy building material, and by producing the material, the environmental pollution is reduced, and the performance of the material can be improved under the condition of not increasing cost.

The invention relates to a method useing cultivated silkworm fibroin heavy chain promoter to express extraneous sources protein. It can increase extraneous sources protein content to 16% which is greatly higher by using light chain protein and fhx promoter. This can broaden cultivated silkworm application field. And it can be used to easily gain transgene silkworm concoon to get purpose extraneous sources protein by feeding purpose transgene silkworm largely.

The invention discloses a construction regenerated binding material prepared from construction garbage, prepared by the following steps: putting the construction garbage in a reclamation machine to rub, impact, activate, and modify, using a micro powder extraction device to obtain regenerated micro powder, adjusting the proportion. The invention also discloses a preparation method of the material, comprising the following steps: pretreating construction garbage, reserving waste concrete, waste bricks, waste lime-sand mortar, and waste slag as raw materials; crushing and sieving raw materials to obtain particles; putting the particles in the reclamation machine for processing, removing inert membranes on sand grains, and activating the surface activity of particles; extracting micro powder by a dust collector, sieving the micro powder, and taking undersized parts to obtain regenerated micro powder; continuously crushing the unextracted particles, and extracting the regenerated micro powder when crushing; examining, and adjusting the components to obtain the construction regenerated binding material, wherein, the particles in the reclamation machine are regenerated sand. The construction regenerated binding material is used for replacing 50-70 % of ordinary portland cement to be as masonry cement.

The invention relates to a method for comprehensively treating construction waste, which comprises the following steps of: 1. disinfecting the construction waste to be treated by adopting a chlorine dioxide disinfectant; 2. loading the construction waste obtained from the step 1 to a hopper and conveying to a sorting platform to sort out impurities; 3. feeding the sorted construction waste to an edge-type crusher through a plate feeder to crush initially; 4. feeding the initially crushed construction waste to a hopper of an impact crusher after magnetic separation by a magnetic separator and crushing the construction waste finally by the impact crusher; 5. screening and peeling out sandstone materials from concrete and feeding the sandstone materials after being washed by a washer to a coarse aggregate bin, wherein the aggregate separated from the washed fine powder washed is used as raw materials of dry mortar or ready mixed mortar or three-hole brick of concrete. The invention ensures that the construction waste resources are utilized comprehensively, and the ordering management, the resource management and the harmless treatment of the construction waste are achieved, thereby achieving the purposes of saving land and reducing secondary pollution.

The invention discloses an organic cultivation method based on rotation of autumn melons, vegetable broad beans, rice and water chestnuts, and relates to the technical field of rotation cropping. The organic cultivation method includes the following steps: (1), establishing an organic cultivation production base; (2), cultivating according to a rotation method; (3), cultivating organic melons, organic vegetable broad beans, organic rice (planting one batch of early-season rice in the first year and the second year of a rotation cycle) and organic water chestnuts according to quality requirements and production technology standards of organic agricultural products, and fertilizing soil by straw turnover and organic fertilizer preparation. The rotation method includes sequentially cultivating the early-season rice, the autumn melons and the vegetable broad beans at the first year, and sequentially cultivating the early-season rice and the water chestnuts at the second year, wherein every two years serve as a rotation cycle. The organic cultivation method has the advantages that the organic melons, the organic vegetable broad beans, the water chestnuts and the organic rice can be cultivated in the same cultivation production base, a high-efficiency ecological circular agriculture cultivation mode, high practicability and operability and high social, economic and ecological benefits are achieved, and the method has a broad promotion and application prospect in the middle and lower reaches of Yangtze River.

The invention discloses a preparation method for steel fiber ABS / PC plastic reclaimed aggregate concrete, which comprises the following steps of smashing, separating, sieving, cleaning and drying waste building concrete to obtain reclaimed concrete aggregate; smashing waste ABS / PC plastics to obtain reclaimed ABS / PC plastic particles; and then stirring steel fibers, reclaimed ABS / PC plastic particles, reclaimed concrete aggregate, natural coarse aggregate, sand, cement and water in proportion. The toughness, rupture strength, compression strength, impact resistance and other properties of the reclaimed aggregate concrete can be effectively improved by steel fiber modification; the reclaimed ABS / PC plastic particles can improve the anti-cracking performance, thermal insulation performance, wear-resisting performance and compression strength of the concrete; and the production of the material can reduce the environment pollution and improve the performance of the material without increasing cost.

The invention discloses a biological treatment method for waste mud in petroleum and natural gas exploration drilling work, which is characterized by comprising the following steps of: a, forming a microbial treatment layer, namely inoculating special microbial strains to the waste mud in a weight ratio of 3-5: 100, mixing the strains and the waste mud uniformly, stirring the mixture and natural soil with water content of 10 to 10 percent and grain diameter of less than 0.5 centimeter uniformly according to the density condition of the waste mud in a following mode to form the microbial treatment layer, adding the natural soil in an amount which is 2.5 to 3 times that of the waste mud into the waste mud with density of 1 to 1.5kg / L, adding the natural soil in an amount which is 2 to 2.5 times that of the waste mud into the waste mud with density of 1.5 to 2.5kg / L, and controlling the water content of the microbial treatment layer to be between 25 and 30 percent; b, treating the soil; and c, treating plants. The method can solve the technical problem that effusion enters underground water to pollute a water source because the natural soil with high water content and large grain diameter is easily scoured by hard rain under the condition that pollutants in a pretreatment mixture are not yet effectively degraded in the prior art.

The invention discloses a facility agriculture intelligent water and fertilizer integrated control system and a control method. The control system comprises a four-layer framework of a planting layermodule, a control layer module, a local management layer module and a remote management layer module; and the control layer module, the local management layer module, the remote management layer module and the planting layer module are electrically connected with each other. The control system comprises the following steps: determining a precise fertilizer mixing control algorithm; determining thedynamic correlation between the atmospheric indexes of the soil plants, and establishing an optimal water and fertilizer regulation and control mode mathematical model; and researching and designingthe facility agricultural water and fertilizer integrated system. According to the control system and the control method in the invention, the utilization coefficient of irrigation water and the effective utilization rate of the fertilizer can be improved, wasting of resources, ecological degradation and environmental pollution are reduced, the sustainable development of agriculture is guaranteed,and high-yield, high-quality, efficient, ecological and safe modern agriculture development is realized.

The invention discloses a method for preparing pueraria fibre from pueraria waste residue, belonging to the field of textile engineering. The method comprises the following steps: (1) separation, (2) water rinse, (3) drying, (4) fluffing, (5) microwave treatment, (6) water rinse,(7) acid rinse, (8) water rinse, (9) first soda boiling, (10) water rinsing, (11) second soda boiling, (12) fibre breaking, (13) bleaching, (14)dehydration, (15) oil Providing (16) dehydration (17) fluffing and (18) drying. The invention adopts the combined technology of microwave-chemical degumming, achieving a shorter total degumming cycle than the total degumming cycle achieved by employing the method only by chemical degumming techniques through strong acid and strong alkali. The fabrication method is simple and less labor-consuming. The invention can lower the production cost and is beneficial to the industrialized production. The method can make use of the pueraria waste residue for a better end, contributes a lot to environment preservation and energy saving. In addition, the pueraria fibre obtained by the method can meet demand of the people on environment-friendly purely natural fibres.

The invention discloses application of candida utilis (CUM) and lactobacillus plantarum (LP) in preparation of enzyme fertilizer with functions of promoting crop growth and development and improving the soil effect, and further discloses the enzyme fertilizer prepared after pomace is fermented through CUM and LP, and a preparation method of the enzyme fertilizer. The method includes the following steps of firstly, mixing pomace, brown sugar, water and yeast fermentation liquor, and conducting sealed fermentation for 25-35 days; secondly, adding a lactic acid bacteria fermented solution to the material subjected to sealed fermentation, and conducting sealed fermentation for 25-35 days. The invention further discloses application of the enzyme fertilizer in crop plantation. The enzyme fertilizer contains a large amount of somatomedin, and therefore the disease resistant function of crops can be improved, pesticide residuals are greatly reduced, and growth and development of crops are promoted; soil can be purified and restored, soil-borne disease pathogen can be restrained, and resisting performance of plants is improved.

The invention provides a novel ocean water surface garbage removing device which comprises a floating plate, a gravity center hemisphere, a rotating shaft, a wind wheel, a propeller, collecting hoppers, a bearing, a pin and a screw. The floating plate floats on the ocean water surface, the gravity center hemisphere is installed below the floating plate, the rotating shaft is vertically installed in a center hole of the floating plate, the propeller is installed on a lower half portion of the rotating shaft, lower half portion of the rotating shaft extends into the gravity center hemisphere, the wind wheel is installed at the top of the rotating shaft, and the top of the rotating shaft extends to the position above the floating plate; the collecting hoppers are installed around the floating plate, and water inlet pipes leading out from the lower portions of the collecting hoppers are inserted into water inlet holes in the periphery of the gravity center hemisphere; and air blows the wind wheel to rotate so as to drive the rotating shaft to rotate, the rotating shaft drives the propeller to rotate, garbage on the water surface of the position around the floating plate flows along the water surface to enter the collecting hoppers, and water without the garbage enters the gravity center hemisphere through the water inlet pipes below the collecting hoppers and is then discharged out from drain holes in the bottom of the gravity center hemisphere. Passing ocean garbage can be collected into the collecting hoppers, and ocean garbage fishing work can be completed.

The present invention discloses a judgment method for preventing the sudden lane change of a back vehicle after overtaking a passenger vehicle and a device. The device comprises an image acquisition module, an LCD monitor, an alarm module, a storage hard disk and a digital signal processor. The method comprises the following steps that a lane image is collected through a camera, firstly whether a vehicle in a left side lane is in an overtaking state is judged, on the above condition, combined with a front lane vehicle travelling state, if only a left front side lane in front lanes has a vehicle or the distance of the vehicle in the left front side lane is smaller than the distance between the front vehicle in an own lane and an own vehicle, which means that the vehicle which overtakes the own vehicle has the possibility of lane change, a system device emits an alarm, and the image of the lane change overtaking vehicle is stored in the storage hard disk at the same time. According to the device and the method, the traffic accident in the overtaking and lane change process of the back vehicle can be effectively prevented, the technical content and ability of road passenger transport safety management are improved practically, and the purpose of improving native road passenger transport safety and the operational efficiency of road passenger transport and maintaining sustainable development is achieved.

The invention discloses a system and method for integrating Internet electronic trade, adopting a structure of symmetrical network, using the devices installed on various Internet trade websites to make inter-network, inter-platform and inter-database bidirectional electronic trade integration. It is worth noticing that the symmetrical network structure makes any level trade integration able to be carried on between equal devices and supports bidirectional exchange of commodity information and settling and delivering information; a code mapping dictionary solves the unconformity problem of commodity numbers in the trade integration; a mode of processing link files related in the trade reduces the pressure in data transmission bandwidth; a trade integration data structure is built by the initiating party and confirmed by the receiving party, thus assuring the conformity of trade integration data. The invention has the advantages of high efficiency, low cost, commodity sharing between websites, trade integration, and profit sharing and the characters of openness, equity, independency and intelligence.

The invention discloses an under-forest-based breeding method of laying hens. The under-forest-based breeding method comprises the following steps: preparing a high-quality laying hen under-forest stocking field; selecting an under-forest-based laying hen house; selecting an under-forest stocking high-quality laying hen variety; carrying out high-quality laying hen under-forest breeding and raising management; preparing an under-forest breeding laying hen feed formula; planting a rotation grazing system and forage grass on a forest land pasture; immunizing stocking laying hens and establishing an under-forest stocking laying hen immunizing procedure; preventing and treating common parasitic diseases of the under-forest breeding of the high-quality laying hens; carrying out harmless treatment on breeding wastes of the stocking laying hens. The under-forest-based breeding method of the laying hens, disclosed by the invention, combines the characteristics of the under-forest breeding, and the immunizing procedure of the laying hens is optimized, and furthermore, the health of chicken flocks is guaranteed; a stocking characteristic is combined so that the prevention and treatment of the common parasitic diseases of the stocking laying hens are completed; the harmless treatment of the breeding wastes of the stocking laying hens is researched, and an ecological environment and sustainable development are guaranteed.

The invention discloses rhizosphere growth-promoting water-soluble microbial bacterium manure. The rhizosphere growth-promoting water-soluble microbial bacterium manure is prepared from culture obtained by carrying out aerobic mixed fermentation on bacillus cereus GF-1, streptococcus thermophilus BLST, bacillus mucilaginosus G3, bacillus subtilis B7348, bacillus subtilis N9-1-35, lactobacillus plantarum LP and candida utilis CUM on a universal culture medium, wherein the total number of biological living bacteria in the microbial bacterium manure is greater than or equal to 2*10<10> CFU / g. The invention also discloses a preparation method of the rhizosphere growth-promoting water-soluble microbial bacterium manure. The microbial bacterium manure disclosed by the invention utilizes exogenous plant growth-promoting bacteria and associated bacteria to improve the micro-environment of root soil, and the prepared microbial bacterium manure is applied into the soil, the soil environment can be effectively improved, the growth of plants is promoted, and the resistances of the plants are improved.

The invention relates to an AE series heat resistant casting magnesium alloy containing cerium and lanthanum, which comprises and has the weight percentage of each element of: Al:3%-5%, Ce:0.4%-2.6%, La:0.4%-2.6%, Mn:0.2%-0.6%, the rest being magnesium. The lanthanum cerium mischmetal used is produced by separating the Nd, Pr which is more valuable and selling from ordinary cerium rich mischmetal which leaves the cheap and abundant cerium lanthanum mischmetal. The invention has better mechanical performance in both normal and high temperature than AE44 and AZ91alloy, and the minimum creep rate under 200 DEG C, 70MPa is 1.82 multiplied by10-9s-1, 100 hour creeping elongation rate is 0.17%, all being better than an AE44 alloy.

The invention provides a biochar slow release base fertilizer special for wheat. The biochar slow release base fertilizer comprises a core layer and a coating layer coating the surface of the core layer. The core layer is made by mixing of the following raw materials by weight part: 30-40 of biochar, 10-15 of urea, 30-35 of potassium dihydrogen phosphate, 15-20 of potassium chloride, 30-40 of weathered coal, 0.2-0.6 of a botanical fungicide, 3-5 of abamectin dreg, 5-8 of vermiculite powder, and 0.2-0.5 of a fertilizer additive, and the weight of the core layer accounts for 50%-60% of the total weight of the slow release fertilizer. The coating layer is a mixture of biochar powder and a binder, and the weight of the coating layer accounts for 40%-50% of the total weight of the slow release fertilizer. The fertilizer provided by the invention has nutrients released slowly under control, one-time fertilization can meet the need of crops for fertilizer in the whole growth period, and the fertilizer dosage is reduced, thus effectively preventing pollution of the fertilizer to the environment. And the fertilizer provided by the invention can improve soil and increase wheat yield.

The invention provides semi-silicon synthetic leather and a preparation method thereof. The semi-silicon synthetic leather sequentially comprises an organosilicone surfacing layer and a polyurethane (PU) synthetic leather layer from top to bottom, wherein the organosilicone surfacing layer is prepared from the following main raw materials: organosilicone-based glue, a crosslinking agent, a platinum catalyst, an inhibitor, filler, a coupling agent, a promoter and an organic solvent; the semi-silicon synthetic is obtained by mixing the raw materials according to an appropriate proportion, and then adopting a gravure printing technology to print the mixed raw material on the surface of PU synthetic leather. Compared with the pure organosilicone synthetic leather, the cost of the semi-siliconsynthetic leather prepared by the method is greatly reduced; furthermore, compared with the traditional PU leather, the semi-silicon synthetic leather maintains the fine and smooth hand feeling as well as good anti-fouling property, mould-proof property and weather resistance of the organosilicone synthetic leather.

The treating process of oil field waste water for compounding tertiary oil production polymer solution includes aeration of waste water in aeration tank with air compressor to aerate from the bottom of the tank; filtering to eliminate three-valent iron ion and other harmful two-valent metal ion, with the three-valent iron being eliminated as ferric hydroxide with manganese sand; and treatment in oxygen eliminating apparatus. The treated waste water may be used directly in compounding polymer solution injected to stratum for displacing oil. The polymer solution compounded with the treated waste water has higher viscosity than that compounded with clear water and thus higher oil recovering rate. The present invention can eliminate environmental pollution caused by oil field waste water and make full use of water resource.

The invention discloses a compound feed used in an Australian Murray cod breeding period and a preparation method thereof and aims at providing a feed specially used in the Australian Murray cod breeding period and capable of remarkably improving the Australian Murray cod growth speed and reducing environmental pollution. The feed consists of imported fish meal 20%-40%, shrimp meal 5%-10%, chicken meat meal 5%-10%, soybean meal 5%-20%, high protein flour 18%-30%, beer yeast 2%-8%, cuttle cream 2%-8%, fish oil 2%-5%, soybean lecithin oil 2%-5%, vitamin premixed compound 0.1%-1.5%, microelement premixed compound 1%-5%, monocalcium phosphate 1%-3%, choline chloride 0.1%-1.5%, vitamin C phosphate ester 0.1%-0.5%, beta-1,3 glucan 0.1%-0.3%, vitamin E 0.03%-0.1%, mildew preventive 0.01%-0.05% and fine bran 0.5%-1.5%. The compound feed belongs to the technical field of fish feeds.

The invention discloses floating-bead-free low-density oil well cement paste and belongs to the technical field of oil and gas well cementation. The cement paste is prepared from 10-30% of cementing material A, 15-50% of cementing material B, 2-48% of filling material, 1-3% of fluid loss agent, 1-4% of early strength agent and 0.5-1.5% of dispersing agent. The cementing material A is one of G-grade oil well cement, D-grade oil well cement and ordinary Portland cement. The cementing material B is superfine ordinary Portland cement. The cement paste has the advantages of being low in cost, low in density, and high in early strength, density stability and quality stability.