48results about How to "Less mud" patented technology

The invention provides a V-shape air-stripping technology for removing nitrogen and phosphorus of large and medium-sized sewage processing. The technology comprises following steps: introducing sewage, subjecting the sewage to go through a coarse screen to remove the slag, then adding water, lifting by a sewage pump, subjecting the sewage to a fine screen, transporting the sewage to a sand settling pool, transporting the sewage to a hydrolysis acidification pool, transporting the sewage to an integral processing pool of V-shape air stripping reflux and two-grade precipitation, transporting the sewage to a disinfecting pool and finally discharging the sewage if the quality of the sewage meets the standard. In the technology, the integral sewage processing pool of V-shape air stripping reflux and two-grade precipitation substitutes the biochemical reaction pool of A / A / O activated sludge process, the nitrated liquid internal reflux pump pool, the secondary precipitation pool, the sludge internal influx and external influx pump pool, the coagulation reaction pool and the inclined tube precipitation pool, and thus the high efficiency and compactness of removing nitrogen and phosphorus in sewage are achieved. Compared to the conventional processing technology, the V-shape air-stripping technology has the advantages of small occupied area, low investment, little drug consumption, little sludge discharge, low energy consumption, low cost, stable and controllable water quality, and convenient operation management.

The invention discloses a pretreatment technology for high-concentration refractory organic petrochemical wastewater. The technology comprises steps as follows: (1) the organic petrochemical wastewater is acidized until the pH ranges from 4 to 5, then the organic petrochemical wastewater is heated to the temperature of 80-95 DEG C, and wastewater A is obtained through solid-liquid separation after precipitation of silicate; (2) iron and copper plates are added to the wastewater A for microelectrolysis for 0.5-2 h, then wastewater B is obtained through solid-liquid separation, the pH of the wastewater B is adjusted to range from 2.0 to 2.5, a hydrogen peroxide solution accounting for 0.5%-3% of the wastewater B in volume is added, the mass fraction of the hydrogen peroxide solution is 25%-40%, a reaction is performed for 1-3 h, and wastewater C is obtained; (3) after the pH of the wastewater C is adjusted to range from 2.5 to 3.5, the wastewater C is subjected to three-dimensional electro-Fenton treatment for 1-3 h, then a flocculating agent is added after the pH is adjusted to range from 9.5 to 10.5 by alkaline liquor, and wastewater D is obtained after solid-liquid separation; (4) the pH of the wastewater D is adjusted to range from 1.5 to 3.5, a catalyst and persulfate are added, the mixture is irradiated by ultraviolet light and aerated for photocatalytic oxidation for 1-2 h, and the pretreatment of the wastewater is completed. With the adoption of the technology, the COD (chemical oxygen demand) value of the wastewater is effectively decreased, and the biodegradability of the wastewater is improved.

The invention provides a small sewage treatment hydrolysis and gas-stripping and precipitation technique method which comprises the following steps of: underground sewage, integrated anaerobic hydrolysis acidifying adjustment lift pump pond, integrated sewage treatment pond for Z type gas-stripping reflux two-stage precipitation, and up-to-standard emission. The anaerobic hydrolysis acidifying adjustment lift pump pond is adopted to replace various conventional and non-conventional comprehensive pretreatment procedures, the integrated sewage treatment pond for Z type gas-stripping reflux two-stage precipitation is adopted to replace procedures of a fine-rack girt chamber, an A / O biochemical reaction basin, a nitration liquid internal-reflux pump basin, a secondary precipitation basin, a sludge internal-reflux pump basin, a sludge external-reflux pump basin, a coagulation-flocculation reaction basin and an inclined-tube precipitation basin, a contact sterilization basin and the like in an A / O activated sludge method. The method has the advantages of being small in occupied space, less in investment and medicine consumption and sludge discharge, low in energy consumption and cost, stable and controllable in water quality, simple and convenient to run and manage, especially suitable for high-efficiency and compact treatment of nitrogen and phosphorus removal of sewage of ten thousand tonnage / per day and below.

The invention discloses a novel treatment process of antibiotic wastewater electron beams. The process is characterized by comprising the following steps of: irradiating electron beams, taking an antibiotic wastewater (500-1000mL) sample, adding 0.5%o-2%o of irradiating synergistic agent, mixing uniformly, conveying by using a tray, and irradiating by using a transmission system under the beam of an electron accelcrator; (2) carrying out coagulating sedimentation, adding 0.2%o - 0.4%o of flocculant into an irradiated water sample, quickly stirring for reacting, adding 0.4%o -0.7%o of coagulant aid, slowly stirring to form alumen ustum, standing for settling for 30 -60min, loading supernate by using a sterile bottle, conserving at temperature of 5oC -8oC, and conveying to the detection place to carry out detection analysis on the concentration of vancomycin and biological value; and (3) carrying out result analysis in which biological value is 0.5%, removal rate is 98.7%, vancomycin in mother solution is lower than a detection limit, and the biotoxicity of wastewater is obviously reduced.

The invention discloses a method for treating oil field produced water in the petroleum industry and a treatment flow thereof for treating the oil field produced water and making the produced water meet the re-injection requirement. The treatment method comprises the following steps of: treating the oil field produced water by using a pre-oxidation treatment device, putting an agent between a primary oil removal tank and a secondary settlement tank, filtering the oil field produced water by using a micropore ceramic granular filter material and then delivering the filtered oil field produced water. The primary oil removal tank, the secondary settlement tank, a delivery tank and a delivery pump are adopted in the treatment flow and connected by adopting pipelines; the front end of the primary oil removal tank is connected with the pre-oxidation treatment device; a coagulation reactor is connected between the primary oil removal tank and the secondary settlement tank; and the tail end of the flow is connected with a ceramic filter tank. The treatment method can solve the problems of corrosion and scaling of the oil field produced water so that the water quality of the treated injection water comprehensively and stably reaches the standard. The treatment method generates a small amount of mud, and greatly reduces the subsequent treatment cost.

The present invention provides a Z-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank, wherein the rectangular tank body contains a grid-containing sand settling pretreatment zone, an anoxic zone, an aeration zone, a clarifying reflux zone, an inclined pipe / plate precipitation zone, a contact disinfection ditch, and the like, and conventional water treatment equipment, a horizontal slit-type gas-water separator, a Z-shaped separation wall, a surface type gas stripping micro power reflux device arranged in a horizontal and completely-paving manner, and an L-shaped hydropower hybrid spiral flow generator are arranged inside the tank body. The Z-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank has a simple and compact structure, and has the following advantages that: denitrogenation, phosphorus removing, two stage precipitation and disinfection treatment are completed in the same tank; and compared with the conventional process adopting a plurality of independent small tanks, the Z-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank of the present invention has advantages of low investment, small occupation area, less agent consumption, less sludge discharge, low energy consumption, low cost, stable and controllable water quality, easy operation and management, and the like, and is especially suitable for sewage denitrogenation and phosphorus removing integrated treatments with a scale of 10000 tons / day and below.

The invention relates to a construction method for a pneumatic tamping pipe of a horizontal frozen hole on a metro bypass, which comprises the following steps: mounting an orifice water sealing device, building a pipe-rammer frame and installing guide rails, preparing for ramming, constructing the pneumatic tamping pipe, sealing and grouting. When the construction is carried out in tunnels, connecting passages and shield entering and leaving tunnels, because the stratum located by the pneumatic tamping pipe is sandy soil, mucky clay, silt, and the like, which is soft, great water-containing and huge pressure-bearing stratum, the application of the method can guarantee less mud from a construction frozen hole, small disturbance to the stratum and construction safety and low cost. The equipment used by the invention is low in cost; the frozen pipes are simple to manufacture without utilizing large-size drill, and have high connection strength, security and reliability, energy saving andenvironmental protection.

The invention belongs to the field of sewage treatment and in particular relates to a novel residual sludge cell wall breaking system and method. The system comprises a mixer, a bead mill and a pH adjusting device, wherein the mixer is provided with a sludge inlet and a magnetic powder feeding port; a sludge outlet of the mixer is communicated with the bead mill; and the mixer is connected with the pH adjusting device by a dosing pump. The system is small in covering area, convenient to run, low in processing cost and the like.

The invention relates to a high-efficiency treatment and recycling method of chemical industry wastewater and biochemical effluent and belongs to the field of wastewater treatment. The method comprises the following steps: (1) carrying out a Fenton oxidation reaction in a reaction tank, regulating the pH value to be 5-7, and adding ferrous sulfate and hydrogen peroxide into a water sample, so as to enable concentration of Fe<2+> and H2O2 respectively to be 1-3 mmol / L and 2-5 mmol / L, and performing reaction for 60-600 minutes; (2) mixing butylated hyper-crosslinked resin with effluent in the step (1), wherein the amount of the resin is 0.1-5 percent of the volume of the water, and mixing for 10-1000 minutes; (3) performing solid-liquid separation of the resin and water in the effluent in the step (2), so as to enable the separated effluent to be discharged or directly recycled. According to the method, hardly degradable substances in the chemical industry wastewater and the biochemical effluent can be effectively removed, the effluent meets the primary A discharge standard of pollutants for municipal wastewater treatment plants and related reclaimed water recycling standards, and the method is applied to advanced treatment and recycling of wastewater.

The invention discloses a thermal power plant desulfurization wastewater up-to-standard discharge treatment system and method. The system comprises a desulfurization wastewater input pipeline, a preliminary sedimentation pool, a heavy metal reactor, a calcium hydroxide adding device, an organic sulfur adding device, a NaClO adding device, an aeration reaction pool, a middle water pool, an electricflocculation device, a centrifugal concentration pool, a plurality of medium filters and a clear water pool. The system and the method have the advantages that the centralized treatment on thermal power plant desulfurization wastewater can be realized; after the treatment, the stable water quality capable of meeting the desulfurization wastewater discharge requirements can be obtained.

The invention provides a processing system for changing chrome tanning wastewater into a resource and a processing technique thereof. The invention relates to a processing method for the chrome tanning wastewater and provides the processing system and the processing technique for changing the chrome tanning wastewater into the resource at normal temperature and pressure with low processing cost and high recycling utilization ratio. The processing system comprises a grating filter pre-settling device, a chemical reaction settling pond, a pressure filter, an acid leaching reaction pool, a filter and a liquid collecting cabin, wherein an output port of the grating filter pre-settling device is connected with an input port of the chemical reaction settling pond; the output port of the chemical reaction settling pond is connected with the input port of the acid leaching reaction pool through the pressure filter; the output port of the acid leaching reaction pool is connected with the liquid collecting cabin through the filter; a pH monitoring adjusting device is arranged on the chemical reaction settling pond; and a heating device is arranged on the acid leaching reaction pool.

The invention provides an integral membrane coagulation reactor (MCR) and a water treatment technology. The integral MCR comprises a membrane pool, and a membrane component and an aerating apparatus which are arranged in the same membrane pool. A coagulant is injected into the membrane pool while aeration is carried out at the bottom of the membrane pool, and the aeration rate is more than or equal to 0.05L / min, so that the coagulant is evenly dissolved in the membrane pool, and the particle sizes of flocs are enabled to stably increase. The contaminants are effectively removed by the coagulant, so that the transmembrane pressure difference increment caused by the contaminants is slowed down. The water quality of effluent is guaranteed by utilizing the interception performance of an ultrafiltration membrane. Furthermore, the surface of the membrane is not damaged by the flocs in a running process. The flocs are continuously formed in the membrane pool, so that the flocs are large in density, sludge is conveniently discharged, and less sludge is left. The integral MCR and the water treatment technology can reduce the occupied area to a great extent while guaranteeing contaminant removal efficiency and retarding membrane fouling. The integral MCR and the water treatment technology can be used for treating drinking water of a contaminated water source, and are also applied to urban sewage plant treatment and reclaimed water purification.

A horn guard device for a motorcycle having an aesthetic appearance improved and being capable of meeting legally-specified values for a horn sound pressure in different countries. A spiral-type horn is attached onto a down tube with its sound-pressure outlet facing the road surface. The horn is placed downward of an engine. A water-exposure guard is provided facing a front portion of the sound-pressure outlet. The water-exposure guard faces the sound-pressure outlet with a predetermined angle therebetween. The water-exposure guard can be integrally formed on a lower portion of a bracket attached to bosses extending to the side from the down tube.

The invention belongs to the field of sewage treatment and in particular relates to a novel residual sludge cell wall breaking method. The invention provides the novel residual sludge cell wall breaking method and also further discloses a residual sludge cell wall breaking device. After residual sludge cell walls are broken by magnetic powders, the residual sludge digestion reaction time is greatly shortened, and the methane gas production rate in a sludge digestion process can be increased by organic matters dissolved out in residual sludge cells. The residual sludge cell wall breaking device is simple and convenient to operate and high in efficiency, and is suitable for industrial large-batch production.

The invention discloses an electric flocculation method for pretreating high-concentration polluted wastewater of glyphosate. The method comprises the following steps that after the glyphosate wastewater is filtered, suspended solids are removed, the pH value of the wastewater is adjusted to be 7+ / -0.2, a water pump is started to pump the wastewater into an electrolytic bath, the electrolytic bath is electrified, water flow is controlled to adjust time for an electrolytic reaction, after the reaction is completed, output water stands still to be deposited for 0.5-1 h, foam on the liquid level is scraped, and upper clean water discharged after bottom sludge is removed is treated water. According to the method, aluminum plates are used for serving as a negative pole and a positive pole of electric flocculation to treat the glyphosate wastewater, and under the condition of the optimum technology parameters, speed of the pollutant removing effect is higher, efficiency is higher, and cost is lower in comparison with a conventional treatment method; the wastewater COD removing rate reaches 70.3% within a short time, the TP removing rate reaches 75.4%, basically, chromaticity and turbidity can be removed completely, the output water is clear, operation is easy, and automatic management can be achieved.

The invention discloses an electrocoagulation / slow decarburization combined water treatment device. The device comprises an electrocoagulation reactor and a slow decarburization process water treatment appliance, wherein the electrocoagulation reactor comprises an electrocoagulation reaction tank, an electrocoagulation reaction appliance and an electrocoagulation power distribution cabinet, the electrocoagulation reaction appliance is arranged in the electrocoagulation reaction tank, and the electrocoagulation reaction appliance is connected with the electrocoagulation power distribution cabinet; the slow decarburization process appliance includes a condensation pool, a flocculation tank and a sloping plate sedimentation tank, the sloping sedimentation tank includes a plug flow zone, a pre-precipitation zone, a sloping plate zone and a sludge concentration zone, and the electrocoagulation reaction tank communicates with the condensation pool; the flocculation tank communicates with thebottom of the condensation pool, the flocculation tank communicates with the plug flow zone, and the plug flow zone is connected with the pre-precipitation zone; and the pre-precipitation zone is connected with the sloping plate zone. The electrocoagulation / slow decarburization combined water treatment device has a perfect supporting control system, high degree of automation and simplified installation of the appliance, and the cost of operation and investment is saved; and the treatment effect is good so that the requirements of softening and clarification pretreatment processes of wastewater can be met, and meanwhile addition of a coagulant and an assistant coagulant is reduced so that safe operation of the subsequent membrane treatment process system can be ensured effectively.

A low-pressure membrane water treatment process based on a sandwich type loose floc protective layer is disclosed. An integrated type membrane coagulation reactor is adopted by the process, and mainly includes a membrane tank, a low-pressure membrane assembly arranged in the membrane tank and an aeration device arranged in the same membrane tank. The membrane tank is in series connection with a suction pump and a coagulant adding tank through a pipeline. The bottom of the membrane tank is provided with a sludge discharging valve. The coagulant is injected into the membrane tank through the coagulant adding tank through a batch-type manner so that coagulant hydrolyzed floc forms the sandwich type loose protective layer on the membrane surface. Raw water is fed into the membrane tank, treated by adsorption by the floc layer and membrane treatment, and then discharged. The process can ensure water quality of discharged water, and can effectively reduce membrane pollution at the same time, especially membrane pollution caused by low-molecular-weight organic matters. The treatment device integrating an adsorption process and a membrane process is adopted by the water treatment process, thus effectively reducing the occupied space.

A horn guard device for a motorcycle having an aesthetic appearance improved and being capable of meeting legally-specified values for a horn sound pressure in different countries. A spiral-type horn is attached onto a down tube with its sound-pressure outlet facing the road surface. The horn is placed downward of an engine. A water-exposure guard is provided facing a front portion of the sound-pressure outlet. The water-exposure guard faces the sound-pressure outlet with a predetermined angle therebetween. The water-exposure guard can be integrally formed on a lower portion of a bracket attached to bosses extending to the side from the down tube.

The invention discloses an oil-containing wastewater treatment process combining an ultrafiltration membrane and an electro-catalysis method. The process comprises the following steps: (1) pretreatingemulsion-containing wastewater; (2) inputting the wastewater into an ultrafiltration membrane system, performing cross-flow filtration, and concentrating grease components, suspended solid and othermacromolecular substances in the wastewater so as to reduce the volume of the waste liquid greatly; (3) inputting the effluent of the ultrafiltration membrane system into an electro-catalysis reactiontank, adjusting the pH value, adding activated carbon, and carrying out an electro-catalytic oxidation reaction; (4) dividing the effluent of the electro-catalysis reaction tank into two parts, returning the supernatant to a circulating liquid storage tank, returning the bottom turbid liquid to the ultrafiltration membrane system, and performing continuous circulation of the wastewater in the ultrafiltration membrane system, the electro-catalysis reaction tank and the circulating liquid storage tank; and (5) performing circulation of the above process for a certain period of time, inputting the effluent of the circulating liquid storage tank into a flocculation sedimentation tank, adjusting the pH value, adding chemicals, completing flocculation and sedimentation, and inputting the effluent to a subsequent treatment system.

The invention discloses a reclamation area complicated geological condition cast-in-situ bored pile multi-machine combined construction method in the field of construction. The method comprises the steps of field preparation, pile position lofting, embedment of protection cylinders, placement of a rotary drilling rig, rotary drilling, hole formation, hole detection, manufacturing and installationof reinforcement cages, casting of concrete and the like. The reclamation area complicated geological condition cast-in-situ bored pile multi-machine combined construction method is suitable for pilefoundation construction of such engineering as municipal administration, construction and urban rail traffic under reclamation area complicated geological conditions, adopts multiple drilling machinesfor combined construction to form holes, and achieves advanced technology, high applicability, economy, high efficiency and excellent social and economical effects.

The invention discloses a pretreatment method of waste emulsion, and belongs to the technical field of sewage treatment. The pretreatment method of the waste emulsion comprises the following steps: sequentially carrying out primary electrochemical demulsification reaction, primary sludge-water separation, electro-catalytic oxidation reaction, sludge-water separation, and / or electro-Fenton reaction, and sludge-water separation, or carrying out electro-Fenton reaction and then electro-catalytic oxidation reaction, iron-carbon micro-electrolysis reaction, Fenton reaction and sludge-water separation on waste emulsion stock solution, and enabling obtained wastewater to enter a biochemical reaction system for up-to-standard sewage discharge treatment. The pretreatment method of the waste emulsion is moderate in one-time investment, low in operation cost, high in automation degree and clear in effluent, and gives consideration to wastewater of other processes of enterprises; one-time treatment of the wastewater is achieved, concentrated liquid and secondary pollution are avoided, and the wastewater treated through the wastewater emulsion pretreatment method can directly enter a subsequentbiochemical system to be subjected to up-to-standard sewage discharge treatment.

The invention relates to an electroflocculation method and an electroflocculation device for simultaneously removing fluorine and cadmium from rural groundwater. The electroflocculation device comprises a power supply, an electroflocculation reaction tank, anode plates, cathode plates, bipolar plates, a clarification tank and a drainage pipe, wherein the cathode plates and the anode plates are incrossing interval placement; meanwhile, the bipolar plates are inserted between the cathode plates and the anode plates; the cathode plates and the anode plates are separately connected through conductive wires, and are connected to the negative electrode and the positive electrode of the power supply respectively; the polar plates are arranged inside the electroflocculation reaction tank; the electroflocculation reaction tank is connected with the clarification tank through the drainage pipe; a water inlet is formed in the lower part of the electroflocculation reaction tank. The electroflocculation method is simple; by the electroflocculation method, the pollutant removing efficiency is high; the electroflocculation method is a novel method for removing the fluorine and the cadmium from the groundwater, by which addition of a chemical is not required and operation is flexible and simple.

The invention relates to a magnetic sludge zero discharge sewage continuous treatment process and a dedicated device. Sewage is treated by an activated sludge aeration tank, an ozone hydrolysis tank and an ozone deodorization tank, separable high concentration sludge is generated according to a principle that microorganism dies and dissolves in extreme environment and adsorption and dependence ofmagnetic powder for sludge, and a set of continuous magnetic sludge rapid separation ozone sludge self-dissolving coupling novel sewage treatment process is built. The process can reduce sludge or discharge no sludge. In addition, the process has the advantages of low energy consumption and low cost and the like, overcomes defects of traditional methods, and appears in the sewage treatment field for the first time.

The invention belongs to the technical field of biological sewage treatment, and relates to a device and a method for simultaneously realizing urban sewage treatment and excess sludge reduction. According to the invention, sludge fermentation is combined with short-cut denitrification and anaerobic ammonia oxidation, short-cut denitrification is used for reducing nitrate nitrogen into nitrite nitrogen by using short-chain fatty acid generated by sludge fermentation, and ammonia nitrogen generated by fermentation is used as a reaction substrate of anaerobic ammonia oxidation for deep denitrification; and thus, efficient, energy-saving and stable denitrification is carried out on urban sewage under the condition that no additional carbon source is added, organic matters in the sludge are recycled, and the sludge is reduced.

The invention relates to a method for deeply dehydrating sludge through gravity concentration and photodecomposition. The method comprises the steps that a macromolecular composite flocculant is added into the sludge with the water content of 98% or above according to the proportion of 1.3%o-1.7%o of the sludge solid content Tds, and the sludge is concentrated through gravity till the water content ranges from 95% to 97%; the sludge subjected to gravity concentration is aerated; Fe2+ salt is added into the aerated sludge according to the proportion of 1.1%o-1.3%o of the sludge solid content Tds, and the sludge is irradiated with ultraviolet light with the wavelength being 253.7 nm; FeSO4.7H2O is added in a stirred mode according to the proportion of 6.5%-8.5% of the sludge solid content Tds. According to the method for deeply dehydrating the sludge through gravity concentration and photodecomposition, the equipment investment cost is low, the agent addition amount is reduced, energy consumption is reduced, environment-friendly clean energy is utilized, and the water content of a sludge cake is reduced.

The invention relates to the field of marine drilling, and discloses drill bit equipment for deep water drilling and a drilling method. The drill bit equipment for deep water drilling comprises a drilling part, a drill body part and a spraying channel, wherein the drilling part comprises a drill bit body and a plurality of blades spirally distributed on the drill bit body; the drill body part is connected with the drilling part; the spraying channel comprises a drilling fluid flow channel, a first spraying hole and a second spraying hole; the drilling fluid flow channel penetrates through the drill body part and extends into the drilling part; the first spraying hole is formed in the drilling part and communicates with the drilling fluid flow channel; and the second spraying hole is formed in the drill body part and communicates with the drilling fluid flow channel. The drilling speed of surface layer drilling machinery is increased, the deep water surface layer operation efficiency is improved, the risk that a roller bit is damaged and fails is avoided, limitation of the service life of a roller bit bearing is overcome, and the second-opening drilling depth can be increased on the premise of meeting operation safety. In addition, the track of a second-opening borehole can be controlled well, the annulus volume is reduced, the amount of well cementation cement is reduced, and the operation cost is reduced.

The invention belongs to the field of wastewater treatment, and particularly relates to an electrochemical comprehensive treatment technology for high-concentration organic wastewater hard to degrade. The wastewater treatment technology comprises pH regulation, electric flocculation, electro-fenton comprehensive treatment, aeration oxidation and coagulating sedimentation. The technology can effectively degrade various benzene rings, phenols, macromolecular compounds to break bonds, the good treatment effect is achieved for organic matters and complexing state heavy metal hard to degrade, the wastewater COD and chroma removal effect is good, the BOD / COD ratio is increased, the wastewater biodegradability is remarkably improved, the treatment efficiency is high, power consumption is low, medicament consumption is low, mud consumption is low, and the good economic and social effect is achieved.

The invention discloses a coal gasification sewage treatment method which sequentially comprises the following steps: coal gasification sewage is pretreated, and the pretreatment comprises oil removaltreatment and coagulation treatment; insoluble substances are removed through double-alkali softening treatment, the double-alkali softening treatment comprises the step of adding a double-alkali softener into the sewage, the double-alkali softener comprises sodium hydroxide and sodium carbonate, the total hardness of the sewage subjected to the double-alkali softening treatment is reduced by 90%or above, and the hardness of the sewage is smaller than 200 mg / L; anaerobic ammonia oxidation treatment is performed; and aerobic aeration treatment is performed. The hardness of the sewage is obviously reduced, the operation is simple and the sludge amount is small.