106 results about "Stabilization pond" patented technology

A system for treating sewage is composed of a pretreating construction, a deflection-type nunja filter pool group and a lateral underflow nunja bed group, which are arranged in gradient mode from high level to low level. Each filter pool contains a vertical retention wall, filler (haydite or zeolite) and aquatic plant. Said lateral underflow nunja bed group consists of multi-stage lateral underflow nunja bed, natural oxygen-aerating area and anaerobic stabilizing pond. Its method is also disclosed.

The invention discloses an ecological combined treatment method and device for rural distributed sewage. The method comprises the steps of A) rural sewage collection and pretreatment; B) treatment by a biological filter; C) treatment by an artificial wetland and a stabilization pond; D) ecological landscape configuration. The device is characterized in that a main water inlet pipeline is respectively connected with a lattice pool and a regulation pool, the regulation pool is connected with a horizontal flow biological filter through a water distribution pipe, the horizontal flow biological filter is connected with a vertical flow biological filter through a filter screen-water distribution pipe, the vertical flow biological filter is connected with a first-level artificial wetland via a perforated water collection pipe which is horizontally arranged, the first-level artificial wetland is connected with a second-level artificial wetland through an overflow weir, the second-level artificial wetland is connected with the stabilization pond through a straight flow water drain pipe, and a main water drain pipe is arranged at the tail end of the stabilization pond. According to the method, energy consumption is not required, the operation and the maintenance are simple and convenient, and the method further has the advantages of landscape effect, economic benefits, simple structure and low investment; high-efficient purification of rural distributed domestic and farming sewage is realized, and the removal rate of nitrogen, phosphorus, COD and the like in sewage is above 80% after treatment.

The invention discloses a method for the advanced treatment of wastewater. The method comprises the following steps of: 1) filtering off-standard wastewater, delivering the wastewater into a catalytic ozonation tower, and simultaneously adding ozone for contact oxidization reaction; 2) delivering the effluent of the catalytic ozonation tower into an oxidization buffer stabilization basin for stabilization; 3) and after the stabilization, delivering the effluent into a BAF basin for treatment, and delivering discharged water into a clean water basin. The method reduces the addition amount of the ozone, improves the utilization efficiency of the ozone, converts the ozone into hydroxyl radicals by using a metal catalyst, and reduces the activation energy of hydroxyl radical oxidation reaction to promote hardly biodegradable macromolecule organic substances in the wastewater to be oxidized into easily biodegradable micromolecule substances, so that the biochemical limit to refining the wastewater is broken through and the biodegradability of the wastewater is increased; and the water quality of the effluent can meet the provincial standard of Jiangsu province, namely Chemical Industry Main Water Pollutant Discharge Standard, completely by further treatment in the BAF basin.

The invention discloses a method for directly preparing lithium hydroxide and lithium carbonate from salt lake brine with a high magnesium-to-lithium ratio. The method comprises the following steps: 1, further stabilizing brine obtained after potassium extraction of a salt pan in a stabilization pond to form boron and lithium brine with low potassium and sodium content; 2, carrying out boron extraction treatment on the boron and lithium brine to form a boric acid product and lithium brine; 3, 4 and 5, allowing the lithium brine to go through three times of refining to obtain a thirdly refinedsolution; 6, allowing the thirdly refined solution to go through a bipolar membrane electrodialyzer to form a lithium hydroxide solution; 7, allowing the lithium hydroxide solution to go through an evaporation crystallizer to obtain a lithium hydroxide monohydrate solid and evaporation mother liquor; 8, washing the lithium hydroxide monohydrate solid for recrystallization to form battery grade lithium hydroxide and a washing solution; and 9, allowing the evaporation mother liquor and the washing solution to go through a gas-liquid reactor to react with carbon dioxide gas to form the lithium carbonate. The method has the advantages of good maneuverability, and great increase of the recovery rate of lithium ions.

The invention discloses a live pig slaughtering wastewater treating method which comprises the steps of (1) removing thick and large materials and pig hairs in wastewater as slaughtering wastewater firstly passes through a mechanical grating screen; (2) removing animal oil and pollutants with specific gravity more than that of water in the wastewater by enabling wastewater to flow into an oil separating sedimentation tank; (3) hydrolyzing macromolecules and organic matters which are difficult to degrade; (4) carrying out EGSB (expanded granular sludge bed) degradation on most part of organic matters in the wastewater; (5) carrying out degassing sedimentation on sludge contained in water from the step (4) in a middle sedimentation tank; (6) improving SBR (styrene butadiene rubber) degradation or converting parts of the organic matters and a large part of ammonia nitrogen; (7) disinfecting; and (8) reducing ammonia nitrogen concentration in water in a stabilization pond. The method aims at slaughtering wastewater characteristics that the water quality and the water amount are large in changing amount, and the COD (chemical oxygen demand), the ammonia nitrogen and the SS (suspended matters) are high, simultaneously considers the problems of deep denitrification and deep organic matter removal, is good in treatment effect, enables the discharged water quality to meet one level of effluent standards after the slaughtering wastewater is treated, and is lower in operating cost and convenient to popularize and apply.

The invention discloses a stabilization ponds-ecological corridors-constructed wetland based tail water treatment system, and belongs to the technical field of sewage treatment. The system comprises stabilization ponds (an aerated pond, a facultative pond and an aerobic pond), ecological corridors (1#, 2# and 3#) and a surface flow wetland; and tail water for treatment sequentially goes through the aerated pond, the 1# ecological corridor, the facultative pond, the 2# ecological corridor, the surface flow wetland, the 3# ecological corridor and the aerobic pond, and is discharged. The system uses biological treatment as a main means, is based on the theoretic research on the removal of pollutants through the aerated pond, a trench wetland and the constructed wetland, follows the conversion rule of main pollutants in tail water, optimally combines different types of the stabilization ponds with the constructed wetland, and utilizes the ecological corridors modeled on the trench wetland as a water conveying trench to form a tandem type aerobic-anaerobic reactor in order to promote the effective removal of the pollutants in the tail water.

The invention discloses a low-consumption nitrification and denitrification coal chemical wastewater advanced treatment device, comprising a catalytic oxidation pond, an oxidation stabilization pond and a rear biochemical BAF pond, wherein the catalytic oxidation pond is filled with ozone-catalytic particles in a static bed form, and a comprehensive dilution tank is provided with a charging hole and a stirrer; the ozone-catalytic particles are prepared from 88.7-91.3 parts of activated aluminium oxide particles, 1.2-1.5 parts of copper oxide, 4-7 parts of polyethylene glycol, 1.5-2 parts of polyvinyl alcohol, 0.8-1 part of titanium dioxide, 0.3-0.5 part of hydroxyl propyl cellulose and 0.2-0.4 part of manganese dioxide; the lower part and the upper part of an aerobic tank in the rear biochemical BAF pond are respectively provided with a lower sieve plate and an upper sieve plate, the lower sieve plate, the upper sieve plate and the side wall of the aerobic tank form an aerobic cavity, and a plurality of aerobic activated sludge particles and a plurality of second masson pines as a filler are arranged in the aerobic cavity. The low-consumption nitrification and denitrification coal chemical wastewater advanced treatment device oxidizes a macromolecular organic matter hard to degrade into a micromolecular organic matter easy to biochemically treat, and the biochemical property of effluent is further improved.

The invention relates to an organic sewage constructed wetland processing and high-yield non-food energy plant cultivating technology, which is characterized in that the organic sewage is sent into a methane tank, an oxidation pond and a constructed wetland orderly to achieve the purpose of sewage purification, and simultaneously, the non-food energy plant is cultivated. The invention has the advantages that a buried type ABR system can be ensured to be in an intermediate-temperature fermentation state, the organic matter is digested quickly, and methane is produced with high yield; the methane is used for intensifying light, heating, increasing carbon dioxide fertilizer and enhancing photosynthesis for the system to produce the non-food energy plant with high yield; under the previous condition, plant seeds and energy plants on the oxidation pond (the stabilization pond) and the constructed wetland can grow quickly so as to obtain high yield and produce high-quality protein feed, and the normal growth and absorption of eutrophic substances in the sewage in winter can be ensured; simultaneously, purified reclaimed water is fully utilized; and the plants inside and outside the system grow quickly, a large amount of carbon dioxide is absorbed and utilized, and zero emission of sewage and methane is realized.

The invention relates to a composite constructed wetland used for low pollution water purification treatment of farmlands and villages. The composite constructed wetland comprises a floating plant stabilization pond, a submerged plant oxidation pond and an emergent aquatic plant / hygrophyte ecology gravel bed which are orderly set along a water flow direction, wherein the floating plant stabilization pond is planted with floating plants, the submerged plant oxidation pond is planted submerged plants, and the emergent aquatic plant / hygrophyte ecology gravel bed is planted with emergent aquatic plants / hygrophytes. The composite constructed wetland adopts an ecological engineering processing method, and the operation cost of the composite constructed wetland is low; the total nitrogen removal rate and the total phosphorus removal rate of the low pollution water of farmlands and villages can reach more than 50% and more than 60%. In the composite constructed wetland, the floating plates, the submerged plants, and the emergent aquatic plants / hygrophytes planted in the floating plant stabilization pond, the submerged plant oxidation pond and the emergent aquatic plant / hygrophyte ecology gravel bed are aquatic economic plants which are capable of generating economic benefits and are easy to popularize in rural areas.

The invention provides a novel low-energy MBR (Membrane Bioractor) sewage treatment complete equipment and remote control system, mainly comprising two parts, i.e., novel low-energy MBR sewage treatment complete equipment and a remote control system; after entering the MBR sewage treatment complete equipment, sewage passes through a fine rack, a stabilization pond, an adjusting tank, a lift pump, an automatic cleaning filter, an integrated A2 / O-MBR reaction tank, a dump pump, an ultraviolet sterilizer and a reclaimed water tank sequentially; by the novel structure of the integrated A2 / O-MBR tank, not only can higher denitrification and phosphorus removal efficiency be obtained, but also aeration rate can be reduced by over 50%; a simple variable aeration method of an electrically operated three-way valve is adopted, so that total aeration rate is again reduced by over 50%; the new structure and the variable aeration method are combined, so that the aeration rate of the MBR sewage treatment complete equipment is 25 to 30% of the original aeration rate, and has the characteristics of high efficiency in denitrification and phosphorus removal, small occupied area and low energy consumption; the remote control system is adopted, and dozens and even over one hundred of the MBR complete equipment can be managed intensively by using an Internet network long-distance data processing function and can realize unattended operation, so the problem of difficulty in later maintenance is solved.

The invention relates to a microaerophilic recirculation treatment method for a membrane-separation concentrated solution of garbage leachate, which comprises the following steps: the concentrated solution is uniformly distributed on the surface layer of the recirculation area via an overhead tank and water distribution pipes, and discharged into a drain pipe via an overlaid soil layer, a garbage landfill layer and a pebble layer; and a forced draft is introduced into the recirculation area to accelerate the organic matters in the concentrated solution and garbage to decompose, and the concentrated solution is finally discharged into a stabilization pond. Since the landfill layer provides a microaerophillic environment, acid fermentation, high concentration and organic acid accumulation are inhibited, thereby accelerating the removal of COD and NH3-N; and the abundant microbial populations in the landfill layer is beneficial to the degradation and stabilization of the landfill layer. Thus, the invention has strong capability for resisting hydraulic load variations and favorable recirculation treatment effect on the concentrated solution.

The invention discloses a sludge digestion liquid nitrogen removal and sludge stabilization device used in municipal wastewater treatment plants and a method. The device is provided with a digestion liquid tank, a nitration tank, an aerobic sedimentation tank, an effluent tank, a sludge stabilization tank, an anaerobic sedimentation tank, a middle water tank and a sludge tank. The method comprises the following steps: the system starts up; the sludge stabilization tank is filled with the water aeration tank effluent in the effluent tank; the mixture in the sludge stabilization tank enters the aerobic sedimentation tank for sludge-water separation; when the NO3- in the effluent of the sludge stabilization tank is more than -N which is more than 5 mg / L, the sludge is discharged; then newly deposited sludge is added, so that the sludge concentration MLSS can be maintained at 20-30 kg MLSS / m3. The device of the invention is suitable for municipal sludge disposal and has perfect structure and technology, high efficiency, good effect, as well as low equipment and operating costs.

The invention provides an artificial wetland treatment system for tail water of a sewage treatment plant. The artificial wetland treatment system at least comprises a shallow water multi-stage water falling channel, an artificial combination unit wetland, an underflow wetland and a biological stabilizing pond; the shallow water multi-stage water falling channel comprises a water channel and a multi-stage water falling dam; the artificial combination unit wetland comprises an aerobic nitrification area, an anoxic denitrification area and a settling area; the underflow wetland comprises a waterinlet channel, a microbial reaction area, wetland plants and a water outlet channel; the biological stabilizing pond is provided with an aquatic plant system and an aquatic animal system; sewage sequentially passes through the shallow water multi-stage water falling channel, the artificial combination unit wetland, the underflow wetland and the biological stabilizing pond sequentially; dwarf vallisneria longipedunculata and emergent aquatic plants are planted in the shallow water multi-stage water falling channel; a plurality of microbial growth based units are arranged in the aerobic nitrification area and the anoxic denitrification area of the artificial combination unit wetland at intervals; and the microbial reaction area of the underflow wetland consists of limestone, volcanic and gravel from top to bottom, and the grain size is from small to big.

The invention provides an SBR+ artificial wetland combined treatment system for domestic sewage recycling. The system consists of an SBR treatment device and an artificial wetland treatment device; the SBR treatment device comprises an SBR tank, a water inlet system, an aeration system, a drainage system, a sludge discharge system and automatic control equipment; and the artificial wetland treatment device consists of a three-level side wetland bed, a natural reoxygenation tank and a stabilization pond. The SBR and artificial wetland combining technology has the advantages of two water treatment techniques. The SBR has the advantages of strong impact load resistance, high automatic control degree and simple operation; and the artificial wetland has the advantages of low operation cost, simple maintenance, ecological effect, greening function, and capacities of beautifying the environment and combining the residential landscape. Meanwhile, the SBR and artificial wetland combining technology can overcome respective defects of the two techniques, shorten the aeration time of the SBR system, and reduce the energy consumption thereof. The artificial wetland can make up the nitrogen and phosphorus removal effect in the SBR; and the SBR system can solve the problem that the artificial wetland system has poor treatment effect in winter, effectively prevents the blockage of the artificial wetland, and reduces the occupied area of the artificial wetland.

An alpine area contact oxidation-artificial wetland combined treatment system and a method thereof for treating rural domestic sewage relate to the system and method of sewage treatment. The invention solves the technical problem that the existing ecological engineering method is largely affected by reason and can not be used in the alpine area. The system of the invention consists of an adjusting tank, a primary settling tank, a biological contact oxidation tank, a secondary settling tank, a horizontal subsurface flow artificial wetland and a stabilization pond which are connected in turn, wherein the adjusting tank, the primary settling tank and the secondary settling tank are built underground, and the biological contact oxidation tank and the horizontal subsurface flow artificial wetland are built indoors. The method is as follows: the rural domestic sewage is treated by the adjusting tank, the primary settling tank, the biological contact oxidation tank and the subsurface flow artificial wetland in turn and enters the stabilization pond to complete the treatment. The effluent can be used as farmland irrigation water. The system and method is suitable for the treatment of the rural domestic sewage in the alpine areas.

The invention relates to a ditch-pond integrated system for controlling agricultural non-point source pollution and purifying river water and an application method thereof, and belongs to the technical field of water pollution controlling. The integrated system comprises an ecological ditch, a precipitating pond, an oxidation pond, a stabilization pond and a river, wherein the water inlet of the precipitating pond is connected with the water outlet of the ecological ditch and the water outlet of the river respectively, the water outlet of the precipitating pond is connected with the water inlet of the oxidation pond; and the water outlet of the oxidation pond is connected with the water inlet of the stabilization pond while the water outlet of the stabilization pond is connected with the water inlet of the river and farmland respectively. The integrated system makes full use of the purifying function of the ditch-pond integrated system, and meanwhile guarantees the ecological stability of the ditch-pond system; the integrated system ha high treatment efficiency.

The present invention relates to a device for treating high-concentration ammonia nitrogen sewage and a process for treating high-concentration ammonia nitrogen sewage using the device. The device comprises a sedimentation tank, a stabilization tank, a biofilter, a gasification high-efficient nitrification reactor and an evaporation-crystallization reactor, the treatment process comprises allowing the sewage to flow into the above device, intercepting a majority of suspended materials in the sewage by the precipitation tank, and then enabling the sewage to flow into the stabilization tank, lifting the sewage in the stabilization tank by the pump to the biofilter for treating and enabling the sewage to flow back to the stabilization tank to form an internal circulation, allowing the spillover sewage to enter the gasification high-efficient nitrification reactor for nitrification treatment, enabling the spillover sewage subjected to the nitrification treatment to enter the evaporation-crystallization reactor to generate the final solid product. Through the above-mentioned technical solution, the present invention provides a device for treating high-concentration ammonia nitrogen sewage and a process for treating high-concentration ammonia nitrogen sewage using the device which can improve the treatment effect and realize the resource utilization.

The invention relates to a sewage treatment system for water shortage cities and a storage and advanced treatment method of sewage and rainwater, belonging to the technical field of water treatment. The system comprises a pretreatment station house, stabilization ponds, a drainage and irrigation station house and artificial wetlands, wherein the stabilization ponds are divided into an anaerobic pond, a facultative pond, a primary aquatic plant pond, a secondary aquatic plant pond, a primary aquatic animal pond and a secondary aquatic animal pond; the artificial wetlands are constructed around the stabilization ponds and divide each of the stabilization ponds; and a culvert pipe passes through the space below the artificial wetlands among the pretreatment station house, the stabilization ponds and the drainage and irrigation station house to enable the pretreatment station house, each stabilization pond and the drainage and irrigation station house to be sequentially connected in series. Biological floras, planted aquatic plants or cultured aquatic animals are respectively put in each stabilization pond, and sewage and rainwater sequentially enter each stabilization pond to be purified. The invention has the advantages of low manufacturing cost and operating cost and easy maintenance and can be used for carrying out effective and reliable sewage treatment.

The invention relates to a dyeing wastewater advanced treatment device which comprises a regulating tank, a floatation tank, an advanced oxidation precipitation tank, an improved filler-type A2O tank, a reflux aeration filter tank and a stabilization pond, wherein the floatation tank is sequentially composed of a silt region, a mixing region and a separation region from bottom to top; the advanced oxidation precipitation tank comprises an aeration mixing region and a precipitation region; the improved filler-type A2O tank comprises a facultative anaerobic section, an anoxic section and an anaerobic section which are divided by deflector plates; and the reflux aeration filter tank comprises a downstream region, an upstream region and a sludge region. Wastewater enters the floatation tank via the regulating tank to remove scum, enters the advanced oxidation precipitation tank in which the pollutants are subjected to oxidative decomposition, enters the improved filler-type A2O tank to perform anoxic and anaerobic reactions, is subjected to reaction and filtration by the reflux aeration filter tank and enters the clean water tank, and the water treated by the stabilization pond is recycled.

The invention discloses a treatment method of farmland wastewater, belonging to the technical field of wastewater treatment. The method comprises the following steps: (1) discharging farmland wastewater collected to a conditioning and storage tank into a plant reinforced precipitation pond with evergreen floating plants; (2) sending the farmland wastewater treated by the plant reinforced precipitation pond into an upstream multistage infiltration system; (3) sending the farmland wastewater treated by the multistage infiltration system into a biological stabilization pond; and (4) sending the farmland wastewater treated by the biological stabilization pond into a multistage surface flow wetland. The farmland wastewater containing high nitrate nitrogen pollutants is treated by a treatment technique which is mainly based on anaerobic denitrification and assisted by ecological wetland filtration and plant absorption; and thus, the method solves the problems of poor treatment effect, high investment and maintenance cost and the like in other farmland wastewater treatment methods, and has obvious environmental benefit and economic benefit.

The present invention relates to the waste water processing field in environmental projects, and relates to the waste water processing field in paper manufacturing industry, in particular to a new technique for the clarification of paper manufacturing waste water by using a synusiologic method. The synusiologic processing method of the paper manufacturing waste water of the present invention comprises the steps of waster water discharge, mesh gauze filtration, collecting basin bleeding, air supporting or sendimentation process, sendimentation basin bleeding, anaerobic pond and facultative pond pumping, fertilizer feeding, stabilization pond bleeding, adjusting basin bleeding, clean water leading-in and ground runoff wetland system entrance. The synusiologic processing method of the paper manufacturing waste water of the present invention can enable the COD value and the SS value of complex waste water to obviously reduce, the pH value is closed to 7, and water quality is clean without flavor. The water quality is superior to the one-grade standard of water contaminant discharge of the paper manufacturing industry, and clean water needed by an adjusting basin can flow back into the adjusting basin without outer discharge, so complete cleaning self circulation is realized.

The invention relates to the technical field of sewage treatment equipment, in particular to an integrated device for processing domestic sewage in small towns. The integrated device comprises a grilled channel, an adjusting pond, a hydrolytic acidification pond, a contact oxidization pond, a coagulation pond, an oblique pipe sedimentation pond, a sterilization pond and a flow groove, which are sequentially connected with one another. Large-block impurities in waste water can be removed through the grilled channel, then the waste water is discharged into the adjusting pond and the hydrolytic acidification pond, pollutants in the waste water can be intercepted by a sludge bed of the hydrolytic acidification pond, macromolecular and complicated organic substances are decomposed into low molecular and simple organic substances through absorption, assimilation and decomposition, the sewage enters the contact oxidization pond after being discharged from the hydrolytic acidification pond, the pollutants in the sewage can be assimilated and decomposed under an aerobic condition to finally generate carbon dioxide (CO2) and water (H2O), and finally the domestic sewage can be discharged by reaching the national standard through the coagulation pond, the oblique pipe sedimentation pond, the sterilization pond and the flow groove; and the water quality is stable and can reach the standard, the processing effect is good, the running cost is low, and the adaptability to the variation of the quality and quantity of the sewage is strong.

The invention provides an in-situ step enhanced combined purification system applicable to a slow flow type river. The in-situ step enhanced combined purification system is formed through the following steps: constructing a percolation dam for intercepting a water body step by step, reducing the flow velocity of the water body and promoting preliminary sedimentation of sediments, floating objectsand suspended matters in the water body; constructing a stabilization pond for settling large-particle-size suspended matters in the water body; constructing an ecological percolation island at the tail end of the stabilization pond, wherein the ecological percolation island is used for removing small-particle-size suspended matters in the water body; constructing a surface flow wetland for removing inflowing suspended matters in the water body, and increasing the transparency of the water body, wherein the percolation dam, the stabilization pond, the ecological percolation island and the surface flow wetland form a four-stage interception system; and constructing shoreside plant zones in areas at two sides of a riverway located at the tail end of the surface flow wetland, wherein the shoreside plant zones and the above four-stage interception system form the five-stage purification system. By constructing the four-stage interception system, the silting risk of the riverway is reduced,and the stability of the structure and the functions of a riverway ecological system is guaranteed; meanwhile, through the five-stage purification system, water is fully purified, the quality of water entering a river is guaranteed to reach the standard, and the purification function of the riverway is improved.

The invention relates to the technical field of sewage constructed wetland treatment. According to a nitrogen and phosphorus removal constructed wetland process technology, a stabilization pond, a subsurface wetland, a deep purification pond and an enhanced phosphate removal unit are involved. The stabilization pond provides an anaerobic environment and is used for primary pretreatment of sewage, and large-molecular organic matter in water is converted into small-molecular organic matter. Water flowing out of the stabilization pond enters the subsurface wetland, the subsurface wetland is mainly used for removing COD in water and conducting nitration, and ammonia nitrogen is converted into nitrate nitrogen. Water flowing out of the subsurface wetland enters the deep purification pond, the deep purification pond provides an anoxic environment and is used for converting nitrate nitrogen into nitrogen, and nitrogen in water is removed. Water flowing out of the stabilization pond enters the enhanced phosphate removal unit, calcite filler is arranged in the enhanced phosphate removal unit, sewage flows through calcite, and phosphate and other ions in water chemically react with calcium ions to form phosphate precipitate to be finally removed. Through organic integration of the whole process, nitrogen and phosphorus removal of water is achieved on the basis of guaranteeing COD removal.

The invention discloses a plant landscape-type sewage ecological treatment technology. The plant landscape-type sewage ecological treatment technology comprises sewage pretreatment, constructed wetland and plant treatment, and micro-power aeration treatment. The plant landscape-type sewage ecological treatment technology is characterized in that a grid well (1), a grit chamber (2), a pre-precipitation tank (3), a subsurface flow-type anaerobic tank (4), a surface current-type micro-power nitrification tank (5), a precipitation stabilization pond (6), a subsurface flow-type ecological channel (7), a subsurface flow-type ecological greening space (8) and an ecological discharge tank (9) are adopted and are planted with plants. Through the subsurface flow-type anaerobic tank (4) and the surface current-type micro-power nitrification tank (5), organic matter removal, denitrification and part of dephosphorization are finished. The precipitation stabilization pond (6) can realize sludge settling and digestion simultaneously. Undigested sludge can be fed back to the pre-precipitation tank (3) periodically so that a treatment amount of sludge is reduced. Through the subsurface flow-type ecological channel (7) and the subsurface flow-type ecological greening space (8), dephosphorization is realized. The bottom of a water inlet section (13) of the subsurface flow-type ecological greening space (8) is provided with a back flush device (17) so that the back flush is realized. Through the combination of a plant-modified A / O biochemical treatment technology and constructed wetlands, organic matter treatment, denitrification and dephosphorization are realized simultaneously and landscape effects are obtained.

The invention discloses a method for directly preparing lithium carbonate from salt lake brine with a high magnesium-to-lithium ratio. The method comprises the following steps: 1, further stabilizingbrine obtained after potassium extraction of a salt pan in a stabilization pond to form boron and lithium brine with low potassium and sodium content; 2, carrying out boron extraction treatment on theboron and lithium brine to form a boric acid product and lithium brine; 3,4 and 5, allowing the lithium brine to go through three times of refining to obtain a thirdly refined solution; 6, allowing part of the thirdly refined solution to go through a bipolar membrane electrodialyzer to form a lithium lye solution; 7, allowing the rest of the thirdly refined solution to go through a forced evaporator in order to obtain a concentrated lithium solution; 8, allowing the concentrated lithium solution and a refined sodium carbonate solution to go through a high efficiency reactor in order to obtaina lithium carbonate precipitate with uniform granularity; and 9, cleaning the lithium carbonate precipitate, drying the cleaned precipitate, and packaging the dried precipitate to obtain a battery grade lithium carbonate product. The method has the advantages of good maneuverability, and great increase of the recovery rate of lithium ions.

The invention relates to a method for recycling the wastewater from papermaking without discharging, comprising the following steps of: (a) pretreating the wastewater from papermaking: recovering the paper pulp in the wastewater by filtering, removing the fiber in the wastewater to guarantee the paper-pulp recovering amount and the effluent quality and reduce the load of the subsequent process, recycling the recovered fiber for production, feeding the left fiber into a physical, chemical and biochemical system, and treating physically, chemically and biochemically; and (b) discharging the wastewater into an aerating pond, treating further, discharging the biochemical sludge and the wastewater into a settling pond, settling in the settling pond, feeding the wastewater into a stabilizing pond, sterilizing by static electricity for recycling, making one part of the settled sludge reflow into the aerating pond, feeding the other part of sludge into a sludge storing pond, settling in the sludge storing pond, returning a supernatant into the aerating pond, storing the sludge for a long time, and transporting outwards to serve as the farmyard manure. The method has the advantages that the capital expense and the operation expense can be saved, the pollutant in the wastewater can be removed, the least energy is consumed, the wastewater from papermaking can be recycled without being discharged, and the enterprises can gain high economic benefit with low investment.

The invention discloses a method for treating domestic sewage through artificial wetland. The method includes following steps: S5, guiding upper-layer domestic sewage in a sewage tank into artificialwetland; S6, guiding the domestic sewage after being treated in upper-layer artificial wetland into middle-layer artificial wetland and bottom-layer artificial wetland, wherein aquatic plants plantedin the middle-layer artificial wetland and the bottom-layer artificial wetland are arranged as follows: taking reed, arundo donax var versicolor, cattail and aquatic iris as emergent aquatic plants ina stabilization pond shoreside shallow area, taking water hyacinth as a main floating-leaved plant and cold-season cress as a main floating bed plant, and total plant coverage is greater than 20%. Compared with conventional technology, the method has the advantages that sewage is pretreated through process steps of filtering, aerating and precipitating, impurities and high salt in the sewage canbe separated effectively, and impact of production sewage on artificial wetland ecological environment is prevented; organic matter decomposed by the aquatic plants can provide a carbon source for wetland denitrification.

The invention provides a sewage treatment method for a paper making plant with small chemical dosage and good treatment effect. Large particles of sewage such as plastic bags, branches and leaves and so on are eliminated through man-made grate, slurry is collected through 60 meshes nylon inclined web, after settled down, water enters a stabilization tank to be discharged or sterilized by static and recycled, part of sludge settled down by a settlement tank returns to an aeration tank, and the residual sludge comes into a sludge storage tank, pumped up by a lift pump to a collecting well and staying for 6 hours to regulate water flow, then the residual sludge is added with coagulant and finally filtered by hollow fiber. The elimination ratios of SS and COD in sewage of the invention are respectively 85 to 98 percent and 60 to 80 percent, and the recovered long fiber can be recycled by a paper making workshop; tiny fibers are removed by a micro-strainer, biochemical treatment load is cut down, and the effluent quality is good, some water is recycled, which is beneficial to wiping off contaminants in water; a suspension train biological aeration system of the invention has low requirements for the tank, and is helpful for eliminating contaminants in water and saves the expenses of infrastructure.

The invention relates to a plant filter bed ecological technology, and belongs to a wastewater treatment technique for constructed wetlands. The technology disclosed by the invention mainly comprises a stabilization pond, a plant filter bed, a deep purifying pond, and a reinforced dephosphorization unit, wherein the stabilization pond provides anaerobic environment and performs preliminary pretreatment on wastewater to remove SS, an ammonifying process is performed, and organic matters are subjected to hydrolysis acidification so as to obtain micromolecules; water flowing out of the stabilization pond enters the plant filter bed, through an aquatic plant stereoscopic net root system and biomembranes attached to the surface of the root system, the organic matters in a water body are removed, and a nitration reaction is performed; water flowing out from the plant filter bed enters the deep purifying pond; the deep purifying pond provides oxygen-deficient environment and is mainly used for converting nitrate nitrogen into nitrogen, so that decarburizing and denitriding the water body are realized; and water flowing out of the stabilization pond enters the reinforced treatment unit. A calcite filling is placed in the reinforced treatment unit, so that ions such as phosphate radicals form phosphate precipitations, and the dephosphorization effect is improved. The plant filter bed in the technology does not need the filling, so that the mounting and the operation are convenient, and the plant filter bed ecological technology is especially suitable for treatment of individually-drained wastewater in rural areas.