8813results about How to "Improve water quality" patented technology

The invention relates to a high efficiency water treatment flocculant for drinking water and water treatment comprising a metal cation flocculant which is characterized in that the high efficiency water treatment flocculant also comprises a high efficiency adsorption component and an assistant medicament to be remixed, inwhich the weight ratio is: the high efficiency adsorption component 5-15%, the metal cation flocculant 50-85%, the assistant medicament 5-15%. The obvious characteristics of the invention are that each component can play the advantages of high intensity of the flocs of the inorganic flocculant and large flocs of the polymeric flocculant, overcomes the drawback of small flocs of the inorganic flocculant and low intensity of the flocs of the organic flocculant. The existence of the high adsorption component plays the action of adsorption of the organic compounds and heavy metal ion which are difficult to flocculat and precipitate, also plays the role of aid-coagulation, decoloration and deflavour. Thus the flocculant of the invention has advantages of good coagulation effect, large alum blossom, rapid settling velocity, good effluent quality and few dosage or the like.

The invention discloses a special biological fish fertilizer and a preparation method for the fertilizer used in aquiculture; wherein, the biological fish fertilizer mainly comprises raw materials as follows: microbiological preparation, inorganic fertilizers, fermentation organics, micro-mineral amino acid chelate, mineral composites, and water quality improver. The preparation method for the special biological fish fertilizer in aquiculture comprises steps as follows: microbiological preparation is produced; fermentation organics is then produced, and the micro-mineral amino acid chelate is produced, eventually the finished products are made. The special biological fish fertilizer has the advantages of limiting the growth and reproduction of the harmful algae, promoting the large-scale growth and reproduction of the suitable food for fish, effectively improving the water quality and purifying the water environment, strengthening the fish immunity, reducing the diseases, reducing cost due to the small use level, convenient use, mild odor, no pollution to the water, and environment protection. By combining the modern bioengineering technique, low-temperature drying technique, spray-drying technique, and super-fine crushing techniques, the preparation method has the advantages of stable quality for the fish fertilizers and lower overall cost.

A storm water receptor having at least one inlet and an outlet positioned at a discharge level lower than the level of the intake provided with a novel, removable divider which divides the receptor into an upper chamber and a lower chamber, having a float-actuated trap door that permits water entering the upper chamber of the catch basin or field inlet to be diverted and flow into the lower chamber until the lower chamber is filled with liquid, at which point the entrance into the lower chamber closes, and water entering the upper chamber passes directly out of the upper chamber through the discharge pipe. In an alternative embodiment of the invention, the float-activated trap door can be replaced with a stationary, removable plate or ramp.

The invention discloses a method for managing town black and olid river pollution in situ by utilizing biological repair technology, which takes the steps and measures of aerating and oxygenizing in riverway, adding a complex microbial agent, biologically repairing bottom sediment, arranging a bio-nest system and the like, so as to control and eliminate the exogenous and endogenous pollution of the river, purify the water quality of the river, improve the self-purification ability of the water body and achieve the purpose of eliminating black and olid. The method does not need to build structures in the riverway or lead the river water out of the riverway to be treated, or dredge the bottom sediment in the river, therefore the method is generally applicable to incomplete sewage interception and dredging or the rivers which can not be intercepted sewage or dredged temporarily, and the in situ treatment to the riverway which is affected by tide and has complicated fluid variation. Therefore, the method which can lead the water body to recover normal ecological function provides the practical, economic and convenient treatment method for various town black and olid rivers.

The invention relates to a water improver with multiple active microbes and a preparation method thereof, which adopts two or a plurality of following microbial strains, comprising a bacillus licheniformis, a bacillus subtilis, a bacillus megaterium, a lactobacillus plantarum, a saccharomyces cerevisiae, a candida lipolytica, bacillus pumilus, bacillus cereus, a rhodopsedomnas palustris, an alcaligenes faecalis and an arthrobacter globiformis. After the femination of the microbial strains, the preparation of the liquid is that the single microzyme zymocyte liquid is mixed and stirred in proportion; or the mixed bacteria solution is concentrated; or the concentrated single microzyme zymocyte liquid is mixed and stirred according to the proportion of the single microzyme zymocyte liquid, and is prepared into a mix bacteria solution. The mix bacteria solution is mixed homogeniously with an added assistant agent. The total amount of the live bacteria within the warrenty period is 106 to 1010 per milliliter. The preparation of the solid inoculant is that the zymocyte liquid is dried after the absoption of the adsorbent on the zymocyte liquid, is prepared into a solid bacterial powder and mixed evenly with the added assistant agent. The total amount of the live bacteria within the warreny period ranges between 106 and 1011 per gram. The invention has multi-function and stable effect and is suitable for treating various water bodies.

The invention relates to an ultrasonic combined waste water treatment process of refuse leachate, relating to the technical field of waste water treatment and recycling of resources and environmental protection. The ultrasonic combined waste water treatment process of the refuse leachate comprises the following steps of: enabling waste water to enter a regulating pond; treating colloids, amphoteric substances and heavy metals in a coagulation sedimentation pond; eliminating ammonia nitrogen in an ultrasonic catalytic oxidation pond; sequentially sedimentating through biological treatment in an ABR (Acrylate Butadience Rubber) baffle plate anaerobic pond, a hydrolytic pond, a facultative pond and an aerobic pond; filtering in a CMBR (Chatter Membrane Bioreactor); eliminating waste gases and stench in a carbon filter pond; disinfecting in a contact disinfection pond; and filtering in an RO (Reverse Osmosis) membrane reverse osmosis system so as to obtain water meeting the requirements for emission standards. The invention also provides a treatment system for the ultrasonic combined waste water treatment process. The ultrasonic combined waste water treatment process and system can obtain the outflow water with stable quality by treating the refuse leachate; the treatment system has the advantages of small size and occupying area, high efficiency, low energy consumption and easy realization for mechanical-electrical integration control and management; and in addition, the invention is beneficial to the protection of the original landscapes of a construction party by adopting a non-buried type structure and also reduces the influence of the operation of the treatment system on an office area.

A device for separating water from sludge comprising a processing box, wherein a feeding cylinder is disposed above the processing box, and the feeding cylinder is fixedly connected to the processing box through a plurality of connecting rods; a rotating rod is rotationally connected into the feeding cylinder; a first rotating motor is fixedly connected to one side of the feeding cylinder; the output end of the first rotating motor penetrates through the side wall of the feeding cylinder, and is fixedly connected to the rotating rod; a spiral blade is fixedly sleeved with the rotating rod, and the outer side of the spiral blade is matched with the inner side wall of the feeding cylinder.

The invention provides a processing method for reducing and recycling organic waste water. The method comprises steps: (1) pre-treating waste water to obtain pre-treated out-water; (2) treating the out-water obtained from the step (1) through solid-liquid separation; (3) nano-filtering the out-water obtained from step (2); (4) treating nano-filtered concentrated water obtained from the step (3) to obtain out-water subjected concentrated water nano-filtering, returning to the step (3) for mixing the out-water subjected to concentrated water nano-filtering with the out-water subjected to solid-liquid separation, and performing nano-filtering; (5) performing first reverse osmosis treatment on out-water obtained from the step (3) through nano-filtering; (6) performing second reverse osmosis treatment on concentrated water obtained from the step (5) through first reverse osmosis treatment; and (7) evaporating and crystallizing a concentrated liquid obtained from the step (6) through second reverse osmosis treatment in order to obtain crystallized salt and evaporated concentrated water. The invention further provides a processing system of the method. Through the method and system, waste water is truly reduced and recycled.

The invention discloses an attapulgite clay porous porous ceramsite, a preparation method of the ceramsite, and a purpose of the ceramsite. The ceramsite is prepared from raw materials of attapulgite clay and biomass, and a binder of industrial soluble glass. The ceramsite is prepared through calcining and oxidizing. The attapulgite clay porous ceramsite prepared by the present invention has advantages of high porosity, large specific surface area, high strength, strong water resistance, high water absorption, high catalytic activity, and the like. The porous ceramsite prepared by the presentinvention can be applied as a carrier for a catalyst, and a filling material for an aerated biological filter.

The invention relates to a positive-negative floatation technology for cellophane, which comprises the following steps: subjecting siliceous-calcareous collophane ore to breaking and grinding process to dissociate ore monomer; adding water to it get ore pulp with concentration of 20 -50%; Leading the mixture to agitated tank; adding modifying agent sodium silicate and positive collector agent to ore pulp; processing the mixture in positive floating system to get foamed product; adding negative floatation agent inorganic acid and collector agent to the foamed product in negative flotation agitated tank; processing the mixture in negative floating system with carbonate vein mineral negative flotation to get foamed product as negative flotation debris and product in tank as clean ore. The invention can simplify process, deduce cost and recycle the water.

The invention relates to high-salt complex wastewater reuse and zero discharge integrated equipment and a technology. The equipment provided by the invention comprises a pretreatment system, a reuse and reduction system and a zero discharge system. The technology comprises the following steps: carrying out homogenization and averaged quantity on high-salt complex wastewater, successively adding sodium hydroxide, sodium carbonate, PAC and PAM to carry out coagulation treatment, letting a mixed liquor which has undergone coagulation treatment enter a filter tank for sedimentation and filtration by the use of an immersed microfiltration membrane, letting a supernatant enter a reverse osmosis treatment process, letting pure water obtained by reverse osmosis treatment enter a reuse water tank for utilization, further condensing condensed brine, and crystallizing the condensed brine or putting the condensed brine into an evaporation pond for atomization and evaporation processing, wherein the reverse osmosis treatment adopts three-level RO: a medium-pressure membrane element is firstly used for desalination and condensation; a high-pressure membrane element is then used for further desalination and condensation; and a ultrahigh-pressure membrane element is finally used for further desalination and condensation. According to the invention, 95% of reverse osmosis concentrated water or analogous high-salt complex wastewater can be recovered for reutilization, only 5% of high strong brine is left to undergo evaporative crystallization or enter the natural evaporation pond. Water resources are fully recycled, and reuse and zero discharge costs of high-salt complex wastewater are reduced.

A floating island comprising one or more layers of nonwoven mesh material and optional buoyant nodules. The mesh material is optionally coated with a spray-on elastomer or inoculated with nutrients or microorganisms. The island can include buoyant growth medium, floats, buoyant blocks, a prefabricated seed blanket, a dunking feature, capillary tubes, wicking units and / or bell flotation units. A larger embodiment is comprised of nonwoven mesh material, buoyant nodules, supplemental flotation units, stepping pads and optional load distribution members. Other optional features include a stepping stone flotation assembly, a stepping stone / vertical buoyant member flotation assembly, and a floating log assembly. The buoyancy of the island can be adjusted with a rigid framework of horizontal members, vertical members that can be moved vertically within the island, and / or a framework of prefabricated flotation tubes and cross members. The present invention also covers a floating island with a boat docking location.

The invention discloses a wastewater evaporation concentration process and a wastewater evaporation concentration device system. The process comprises the following steps of: delivering softened wastewater to be treated to a mechanical vapor recompression (MVR) system to perform evaporation and concentration, compressing the generated secondary steam and then delivering the compressed steam to an evaporator to recycle, delivering the concentrate to a triple-effect mixed flow forced circulating evaporation crystallization system to perform evaporation and crystallization, performing solid-liquid centrifugal separation on the crystallized concentrate and crystal grains, returning the separated mother solution to a stock solution tank or continuously performing evaporation and crystallization, and reclaiming the separated crystal, wherein the secondary steam generated by evaporation and crystallization is recycled for the evaporation crystallization system. After the wastewater is evaporated and concentrated by adopting the process of mechanical vapor recompression circulating evaporation and triple-effect mixed flow forced circulating evaporation crystallization, the wastewater does not need to be discharged to the ground water area, and the wastewater is discharged in a form of steam or closed and embedded in a form of sludge or the like, so the purpose of zero discharge of the wastewater can be fulfilled; and the process system has high heat efficiency, low energy consumption, energy conservation, great reduction in running cost, low temperature difference, low corrosion, difficult scale formation and long equipment service life.

The invention discloses a hard reinforced concrete revetment slope biological repairing method, which is characterized by comprising the steps of: roughing a concrete revetment and constructing drainage ditches at set intervals; digging a water collecting tank on one side of the cross of the revetment and a road, reserving an opening at the joint of the drainage ditch and the water collecting tank, and constructing a watertight concrete overflow bank; filling gravels in the water collecting tank and the drainage ditches; and welding earthwork grids by high-density polyethylene stripes on the protection slope, laying gravel cushion coats in the earthwork grids, and finally pouring biological slurry. The method has the advantages that: the whole project is stable and safe; rain flows into the water collecting tank and passes through grave areas, non-watertight sand-free concrete, a slope cushion coat, plant roots and the like to seep into rivers, so water quality is improved to a relatively large extent; when rainfall runoff is overlarge, the rain overflows from the overflow bank and passes through the graves of the drainage ditches, so the water quality is also purified to a certain extent, meanwhile the slope is protected; the biological slurry poured onto the slope is prepared from biological materials, and has certain anti-erosion strength and can be used as a substrate for plant growth, so the cost is low and the operation is simple.

The invention discloses a removing method of ammonia nitrogen from water through ozone catalytic oxidation, which comprises the following steps: one, arranging activator in reactor; two, proceeding ozone disperse-gas in the reactor; three, controlling contacted time of ozone and waste water and activator and waste water with full of ozone; leading the disposing water out of reactor; getting yielding water. This invention can either dispose high concentrate ammonia nitrogen waste water, or low concentrate ammonia nitrogen waste water, and non-cause twice pollution.

The present invention relates to an active peptide feed addictive, as a mixture of one or more plant protein and animal protein, which is the product of the following steps: fermenting and degrading the mixture through bacillus and the like, controlling the degree of hydrolysis at 20-35%, obtaining a fermentation supernatant after a separation post-processing process, concentrating drying the supernatant or directly adsorbing the supernatant onto the carrier, and then low temperature drying it. Said active peptide feed addictive is capable of obviously depressing development of bacillus coli and salmonella, and can prevention and cure diarrhea caused by bacilli or lienteric diarrhea; can exert its functions at a very low concentration, with a very intense effect; can regulate stomach and intestine bacterium group and promote animals digestion functions; can excite animal immune function, reinforce animal disease resistance against a plurality of epidemic diseases and greatly reduce the morbidity and death rate; can promote animal development and improve the growth velocity; can improve the feed use ratio and reduce production costs. Applications of the microorganism fermentation degradation method provided by the present invention have a low fabricating cost, and the obtained peptides have many kinds and high content, without environment pollutions.

The invention discloses a river crab integrated culture method in ponds. The river crab integrated culture method in the ponds comprises the following steps of preparing the ponds; equipping the ponds with escape-proof facilities, water inlet and drainage facilities and bottom aeration facilities; breeding snails, river crabs, freshwater shrimps, dark sleepers and Aristichthysnobilis; planting aquatic plants; feeding feedstuff; managing water quality and sloughing. According to the river crab integrated culture method in the ponds, the ecological layout is adjusted, the self-purifying capacity of the ponds is improved, the pressure exerted on creatures by eutrophication of a water environment and the ponds can be released, the ecological balance and the stabilization of the water quality can be kept, and accordingly the disease incidence are reduced and the foundation for achieving high and stable yields is laid; meanwhile, existing culture facilities are fully taken advantages of, the comprehensive productivity of the ponds is improved, and accordingly the overall economic benefits are improved. The river crab integrated culture method in the ponds is beneficial to utilizing solar energy and the feedstuff to the utmost, preventing diseases and improving the capacity of resisting natural and market risks. Through the embodiment of the river crab integrated culture method in the ponds, the disease incidence of the crabs cultured in the ponds can be reduced, and the culture loss and culture risks can be reduced. The predicted comprehensive benefits of the culture can be improved, and meanwhile the pollution of the ecological environment of a water area caused by the culture can be reduced.

The invention relates to a restoration method for a damaged ecosystem in a steep-slope area in a water-level-fluctuating zone of a reservoir. The method comprises the following steps:when the impounded water level is at the lowest point, cleaning the upstream slope in the water-level-fluctuating zone, and manually tamping; digging planting holes at the top of the slope, and planting Chinese red pines and the like to form a multifunctional protective forest belt; digging planting grooves and planting holes within the range of the water-level-fluctuating zone, laying jute geotextile, planting vetiver within the range with the water-level-fluctuating depth of 2m to form a hedgerow; and mixedly planting vetiver and wire grass within the range with the water-level-fluctuating depth of 2-10m to form a combined vegetation slope restoration belt. The protective forest belt, the hedgerow and the combined vegetation slope restoration belt form a three-dimensional restoration space together, thereby ensuring that plants can take roots and restore in the steep-slope area in the water-level-fluctuating zone. By restoring the vegetation in large area, the invention effectively reduces the overland flow and the soil erosion, and improves the fertility and the properties of the soil, thereby restoring the damaged ecosystem. The invention has the advantages of convenient construction and less investment, can not be easily damaged by water, and is applicable to the water-level-fluctuating zone of a reservoir with large water-level-fluctuating range and precipitous topography.

The invention relates to compound microecologics for purifying water quality and a preparation method thereof, belonging to the technical field of applied biotechnology. The method is characterized by conforming to the principle of diversified development of microecologics, utilizing various kinds of beneficial bacteria with different functions, carrying out scientific combination according to the proportion occupied by each kind of bacteria determined by orthogonal experiment, and forming efficient the multifunctional compound microecologics with the functions of intestine environment improvement, eating promotion, harmful bacteria restriction, water quality improvement, and the like. The invention is more characterized in that beneficial bacteria in the invention can be obtained easily at various parent strain markets, liquid fermentation technology is adopted for enlarging culture, and viable breeding accelerator, protective agent, viable absorbent, and the like are added to ensure the stability and the high efficiency of the compound microecologics. The invention solves the problems of unstable product characteristics, unsatisfactory using effect, low viable bacteria survival rate, and the like of microecologics at the current market.

The invention discloses a method for removing water eutrophication, which comprises the following steps of: investigating a community structure of aquatic organisms in water body, and finding a missing link or broken link in a food chain according to an investigation result; stocking predacious fishes in the water body, removing small trash fishes and herbivorous fishes from the water body by adopting a medicament mode or a manual fishing mode, and regulating the community structure of the fishes in the water body; planting submerged plants, floating plants and emergent aquatic plants in the water with the depth of 0 to 1.5m; and stocking filter-feeding fishes, filter-feeding shellfishes, detritus feeding benthonic animals and herbivorous fishes in the water body. The method for removing water eutrophication can realize the removal of the water eutrophication and ecological restoration for large-scale water body of which the parameters cannot be manually controlled, effectively inhibit the outburst of algal bloom and keep the stable quality of the water body.

The invention relates to a method for treating high salinity wastewater. The invention uses treatment processes of alkali regulation and hardness removal, immersed microfiltration, neutralization and membrane distillation, aiming at the high salinity wastewater in petrifaction enterprises. The immersed microfiltration solves the problems of easy blocking, rapid flux decline rate and the like of a membrane; and the alkali regulation and hardness removal effectively removes the hardness in wastewater, reduces membrane pollution, improves the concentration multiple of the membrane distillation, lowers the load of evaporation and improves the processing effect and the operation stability of the membrane distillation. The method of the invention has wide applicability, simple device, convenient operation, stable operation and the like, and water produced by membrane distillation is good in water quality and can be directly reused for production.

The invention discloses a wastewater evaporating process and device system. The wastewater evaporating process comprises the following steps: the wastewater to be treated firstly enters a pretreatment softening system for softening treatment and secondly enters a mechanical vapor recompression (MVR) system for evaporation concentration; the generated secondary steam is compressed and enters an evaporator for recycling; the concentrated solution enters a triple effect flow-mixing forced circulation evaporation and crystallization system for evaporation and crystallization; the generated secondary steam is reused by the evaporation and crystallization system; the concentrated solution and crystalline grains obtained through crystallization are subject to solid-liquid centrifugal separation; the separated mother solution is sent back to a raw liquor tank or evaporated continuously for crystallization; and the separated crystals enter a centrifugal drying and packaging system for weighting and packaging. After the process disclosed by the invention is adopted to soften, evaporate and crystallize wastewater and dry and package the obtained crystals, wastewater is not discharged to the water bodies of the surface of earth and the aim of zero wastewater discharge can be realized; the process system is low-carbon and environmentally friendly; the material can be recycled, the thermal efficiency is high, the energy consumption is low, the energy can be saved, the operating cost can be greatly reduced, the range of temperature is small, the corrosion is low and the service life of the equipment is long, and the scaling has small possibility of occurrence.

The invention discloses an environmentally-friendly soft-shelled turtle compound feed, including the following material components (each component is in the air-dry substance weight percentage): 30-35% of white fish meal, 15-25% of red fish meal, 5-10 % of fermented soybean mea, 3-6% of extruded soybean, 1-4% of wheat gluten, 5-10% of beer yeast, 18-25% of pre-gelatinized starch, 1-2% of calcium phosphate, 0.05-0.3% of enzyme preparation, 0.1-0.4% of microbial agents, 0.1-0.3% of compound multivitamins, 0.5-1.5% of composite multi-ore, 0.2-0.5% of 50% choline chloride. The inventive prescription can reduce the nitrogen and phosphorus content in the compound feed, improve the digestive absorption and deposition rate of the nitrogen and phosphorus in the soft-shelled turtle breeding, and can reduce the output of nitrogen and phosphorus in water to improve the breeding environment.

The invention discloses a reproducible phosphorus-uptake ceramsite and a preparation method thereof. The technical scheme provided by the invention comprises the following steps of: respectively drying 70-85 wt% of fly ash, 10-16 wt% of pore-forming agent and 5-14 wt% of clay powder and uniformly mixing the raw materials; after balling the mixture, baking at a temperature in a range of 950-1100 DEG C for 30-50 min to obtain a baked porous ceramsite; sequentially immersing the baked porous ceramsite with HCl, washing with water and drying; and loading zirconium oxide hydrate to obtain the phosphorus-uptake ceramsite. The phosphorus-uptake ceramsite prepared by the invention can be directly added into or filled as a filtering column to remove phosphorus in the water and the adsorbed phosphorus-uptake ceramsite can be desorbed by a NaOH solution to be reproduced; the saturated adsorption capacity to the phosphorus is 10-11 mg / g and the adaptability to the change of the phosphorus concentration in the water is good; after the treatment, the solid-liquid separation is easy to realize and the water quality of the discharged water is better. The reproducible phosphorus-uptake ceramsite provided by the invention has the advantages of strong phosphorus-uptake capability, easiness of realizing the solid-liquid separation, good cyclic usability and higher cost performance, so that the reproducible phosphorus-uptake ceramsite is applicable to phosphorous removal of various types of wastewater and surface water.

The invention discloses a gasification method of chilling slurry or powdery carbonic material. The method mainly consists of four technologies which are gasification in opposed multi-burner type, primary purification of synthetic gas, heat recovery and the treatment and recycling of black water, wherein, a gasification furnace is the core device of the method in the gasification process, which is provided with at least two pairs of opposed burners in uniform distribution and realizes the full gasification of the material under the operation pressure of 3-8 MPaG and the operation temperature of below 1200 DEG C-1700 DEG C. The invention has the following advantages: the carbon conversion rate in the gasification furnace is up to more than 90 percent, the effective gas content during slurry feeding is more than 84 percent and the effective content during powdery feeding is more than 90 percent; the ash content of the synthetic gas after primary purification is low, which can be lowered to below 1 mg / Nm<3>, thus having better water-gas ratio, i.e. the volume ratio of steam / synthetic gas (dry basis) is 1.3-1.5 / 1; the heat of the black water is totally recovered, the quality of ash water after purification is good and no fouling and clogging phenomena occur; the energy consumption, the oxygen consumption and the water consumption of the whole gasification process are relatively low, thus being capable of realizing long period stable operation with high efficiency.

The present invention provides compositions and methods for resolving bioavailable oxygen supply to plants subjected to hypoxic stresses. Compositions of the invention comprise an oxidizing agent, wherein the level and rate of oxygen released from the composition is controlled. Use of the compositions of the invention address hypoxic stress and also stimulate plant growth, enhance plant vigor, and / or improve crop yield.

The invention discloses an integrated advanced water treatment method by ultrafiltration membrane coagulation / adsorption / biological reactor and a device thereof. In the invention,, in which the coagulation, the adsorption and biological reaction is combined and completed in a same reaction cell. Raw water enters the ultrafiltration membrane coagulation / adsorption / biological reactor; activated sludge microorganism in the reactor biologically degrades ammonia nitrogen and organic matters with low molecular weight in the water; a coagulant-adsorbent adding system adds coagulant and adsorbent in the reactor to remove the organic matters with medium and high molecular weight and phosphorus; at last, the immersion ultrafiltration membrane components arranged in the reactor carries out the solid-liquid separation to prepare drinking water with excellent quality.A perforated aeration pipe is arranged on the lower part of the reacted to be connected with a sludge discharge pip to discharge the residual sludge in the reactor regularly. In order to ensure the membrane flux, a membrane reverse washing system carries out the reverse washing for the ultrafiltration membrane components regularly.The invention combines the coagulation effect, the absorption effect as well as the biological effect and ultrafiltration physical interception effect together so that the manufacturing cost and operation cost are remarkably reduced, while the invention is a novel process with the advantages of high efficiency, energy saving, convenient maintenance and management of advanced purification of the drinking water.

Filtration systems (40) utilize a pre-treatment method to cause scale formation to occur on particles (94) in the fluid stream (96) rather than on the filter surface and may also destroy microorganisms in the fluid stream. More specifically, but not limited to, a filtration device can be a filtration membrane, such as spiral wound filtration membrane (60), that utilizes an open feed spacer (80), such for example an embossed or printed pattern on the membrane, to create a thin feed spacer channel which replaces a conventional feed spacer mesh material. System (40) further utilizes a treatment device (54) to enable a pulsed power, magnetic, electro-magnetic, electro-static, or hydrodynamic fluid treatment scheme to condition particles in the fluid stream (96) such that scale forming elements precipitate (94) on to the particles in the fluid stream rather than on the filtration surfaces.

The invention belongs to the technical field of sewage treatment, and relates to a rural domestic sewage biological treatment system, particularly a rural domestic sewage biological treatment system which has the advantages of low capital construction and operating cost, small occupied room, convenient operation and management, high sewage treatment efficiency and discharge after reaching the standard. The rural domestic sewage biological treatment system provided by the invention is connected with a rural domestic sewage discharge pipeline. The rural domestic sewage biological treatment system is characterized by comprising an ecological open septic tank, a microaeration oxidation pond, a suspended substance biological filter, an artificial wetland and a scenic pond, wherein the ecological open septic tank, microaeration oxidation pond, suspended substance biological filter, artificial wetland and scenic pond are arranged from high to low and communicated through a pipeline or ditch; the sewage flows under the gravity; and the water inlet of the ecological open septic tank is connected with the rural domestic sewage discharge pipeline. The rural domestic sewage biological treatment system provided by the invention solves the problem of large occupied area, high investment and maintenance cost and the like in other rural sewage treatment methods.