178results about How to "Improve phosphorus removal efficiency" patented technology

The invention belongs to the field of sewage treatment, and relates to a tidal current wetland coupled electrochemical reinforced denitrification and dephosphorization method and system. The system comprises a tidal current artificial wetland aerobic bed (1), an anaerobic electrolysis bed (2) positioned on the lower part of the tidal current artificial wetland aerobic bed (1), and a system reflux pump (8) for connecting the tidal current artificial wetland aerobic bed (1) and the anaerobic electrolysis bed (2), wherein the tidal current artificial wetland aerobic bed (1) is communicated with a water inlet pipe (5) of an arranged pump, and planted with wetland plants (9); a first plate electrode (4) and a second plate electrode (11) are arranged inside the anaerobic electrolysis bed (2) and respectively connected with electrodes of a direct current power supply (3), and the bottom of the anaerobic electrolysis bed (2) is provided with a draining valve (6); and the positive and negative electrodes of the direct current power supply (3) can be exchanged regularly. The invention can reinforce the removal effect of nitrate and phosphate in the tidal current artificial wetland bed, and solve the problem that the operation of the wetland sewage treatment is greatly influenced by the seasonal changes, and the like.

The invention relates to a multi-mode constant-water-level sequencing batch active sludge sewage treatment method and system, belonging to the technical field of sewage treatment. The system comprises a sludge concentration pre-anoxic pond, an anaerobic pond, an anoxic pond, an aerobic pond, a facultative pond and a sequencing batch pond which are communicated, wherein the facultative pond runs in an aerobic or anoxic way. According to the system, multi-mode sewage treatment ways including an anaerobic-anoxic-aerobic mode, an anoxic-anaerobic-aerobic mode and an anaerobic-anoxic-aerobic-anoxic-aerobic mode can be performed. Due to the adoption of the sewage treatment method, the removing effects of nitrogen, phosphorus and organic matters can be enhanced, and equipment utilization ratio is increased.

The invention relates to a biology processing apparatus capable of processing sewage at low-temperature with low carbon-nitrogen-ratio in a cold region and a method for processing sewage at low-temperature with low carbon-nitrogen-ratio in the cold region, which relates to the biology processing apparatus for processing sewage and the method for processing sewage. According to the invention, problems that the ratio of carbon source and nitrogen source of sewage in winner at the cold region is low, the synchronization nitrogen and phosphorus removal efficiency in the current sewage processing technology is low, the index of nitrogen and phosphor in a processed effluent can not reach the standard can be solved. The apparatus comprises a water storage tank, a pre-conditioning hypoxia pool, an anaerobic pond, an anoxic pool, an aerobic tank, a sedimentation basin, an aeration head, a filling material, a stirrer, a water inlet pump, a reflux pump, a valve, an outlet pipe, a sludge discharge pipe and a residual sludge discharge pipe; The method comprises the following steps: 1)culturing microbe on a filling material; 2)adjusting operation parameter; 3)adjusting reflux ratio parameter; 4)passing the sewage through the pre-conditioning hypoxia pool, the anaerobic pond, the anoxic pool, the aerobic tank and the sedimentation basin for processing to obtain the processed water. The apparatus and the method can be used for construction and reconstruction of the sewage processing technology at low-temperature with low carbon-nitrogen-ratio in a north region.

A preparation method for modified fly ash phosphor absorbent and application thereof is characterized in that uniformly mixing fly ash and water firstly; adding sulfuric acid with the thickness of 98%, and the weight ratio of the fly ash, the water and sulfuric acid is 100: (6-10): (2-50), and stirring uniformly; and at last curing for 0.5 to 5 hours at the temperature of 20 to 300 DEG C and getting the modified fly ash phosphor absorbent. The invention has the creative characteristics of making use of low-cost sulfuric aid modifier to largely dissolve substances with phosphor absorbing potential and further improving the surface area of the fly ash, thereby getting the absorbent with relatively high phosphor removing ability and maximally playing the phosphor removing potential of the fly ash. The invention eliminates the working procedures such as high-temperature roasting, acid solution and alkaline solution extraction, filtering, drying, etc. which are commonly used in fly ash modifying process, thereby realizing simple technology. The absorbent has relatively high speed of phosphor absorbing when put into sewage, and the maximum purification effect can be achieved in 5 minutes.

The invention provides a method for removing phosphorous based on high-efficiency promotion of spongy iron corrosion in the process of nitrogen removal by denitrification, belonging to the field of environment engineering technology. Sulphur can be used both as an electron donor for denitrification and as a reinforcing agent for promoting corrosion of spongy iron to remove phosphorous; when spongy iron and sulphur are mixed and put into a reactor, the phosphorous removal effect through corrosion of spongy iron can be improved; and when a mixture of sulphur mainly exerting sulfur-based autotrophic denitrification effect and spongy iron mainly exerting phosphorous removal effect through corrosion is used as a filling material of a denitrification filter tank, the effect of phosphorous removal can be improved, the process of denitrification is reinforced, so the dual effects of in-depth phosphorous removal and synchronous nitrogen removal on low carbon-nitrogen-ratio reclaimed water are obtained. The method provided by the invention has good application prospects in treatment of high-quality reclaimed water.

The invention discloses an inorganic-organic composite chemical dephosphorizing agent, a preparation method and an application thereof. The preparation method comprises the following steps that: under the protection of fed-in nitrogen gas, non-ion monomer, anion monomer and cation monomer with a certain proportion are selected; polymerization reaction is carried out under the action of a composite initiator at a temperature of between 35 and 70 DEG C for 2 to 6 hours; and then, an inorganic electrolyte and a stabilizer with a certain concentration are added and stirred evenly so as to generate the transparent dense inorganic-organic composite chemical dephosphorizing agent. The invention also comprises an application of the dephosphorizing agent in dephosphorizing treatment of domestic sewage, and has the advantages of less dose, wide pH application range, high dephosphorizing efficiency, coarse floe and quick settling velocity, etc.

A process for denitrifying and dephosphorizing sewage features use of biological treating method in such manner that the anoxic condition, anaerobic condition and aerobic condition are sequentially arranged. Its advantages are no conflict in carbon source and sludge age, and high effect.

The invention discloses an enhanced nitrogen and phosphorus removal combined type artificial subsurface-flow wetland treatment system. The system comprises a sedimentation pool with a screen cloth, a front catchment buffer pool, a vertical flow artificial wetland, an advection artificial wetland system and a rear catchment buffer pool; algae and suspension pollutants in sewage are removed through the screen cloth, then, primary sedimentation of the sewage is completed inside the sedimentation pool, the sewage enters the front catchment buffer pool through an overflow weir, and then the sewage enters the vertical flow artificial wetland system through a water inlet, sufficient oxygen is provided for the vertical flow artificial wetland system through a micro-aeration device, then, the sewage enters the advection artificial wetland system after the adsorption effect of microorganisms, plants and matrixes, and the sewage is discharged into the rear catchment buffer pool after being treated by the advection artificial wetland system, and discharged out of the system through a water outlet pipe. According to the enhanced nitrogen and phosphorus removal combined type artificial subsurface-flow wetland treatment system, the nitrogen and phosphorus removal effect can be enhanced, and suspended particles, organic pollutants, heavy metal ions and other contaminants in sewage can be effectively removed.

A novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity comprises the steps that a emical treatment unit effectively removes and converts organic pollutants into inorganic small molecular substance through microorganism in a biochemical treatment system, and the certain sludge concentration in the biochemical treatment unit is maintained; in a sediment unit, sewage produced after the treatment of the biochemical treatment unit enters a secondary sedimentation tank to perform sludge-water separation, a part of subsided sludge is excess sludge, the rest is returned sludge, and two third of returned sludge directly enters the biochemical treatment unit; in a ferrate oxidization treatment unit, one third of returned sludge enters a sludge reaction tank to react with input ferrate for 10-30 minutes, wherein the mass ratio of the ferrate to the excess sludge is 0.2:1; and a sludge dewatering unit performs filter pressing or centrifugal dewatering of the excess sludge. The novel sewage treatment process can reduce 35-45% of excess sludge quantity, has the advantages of being simple in devices, few in investment, free of pollution, convenient to operate and manage, low in operation cost and the like, and is suitable for application of industrial municipal sewage treatment plants.

The invention provides phosphorus removal modified slag haycite and a preparation method and an application thereof. The phosphorus removal modified slag haycite is formed by mixing, granulating and sintering raw materials, calcium hydroxide modified slag, an adhesive and a pore-enlarging agent; the mass ratio of the calcium hydroxide modified slag to the adhesive to the pore-enlarging agent is (50-80%): (15-30%):(5-20%). The calcium hydroxide modified slag is mixed slurry prepared by adding water after mixing slag and calcium hydroxide powder in a mass ratio of (2-5): 1. When the modified slag haycite is adopted for removing phosphorus, the modified slag haycite is substantially not affected by pH value of a water body, can adsorb phosphate in the water body efficiently within a short time, is good in adsorption effect and high in phosphorus removal efficiency, and not only can be directly used for repairing eutrophicated rivers and lakes, but also can be used for forced phosphorous removal of an artificial wetland and deep treatment of conventional waste water treatment engineering and etc. The used raw materials are wide in source and low in price. The preparation method is simple, green and environment-friendly, in process and high in operability and has a wide industrial application prospect.

The invention discloses an efficient nitrogen and phosphorus removal method for sewage properties-classified treatment in a highway service area. The efficient nitrogen and phosphorus removal method includes that toilet flushing sewage in the highway service area flows into a septic tank to be treated, the sewage in the septic tank sequentially flows through an adjusting tank (1), a nitration tank (1), a settling tank (1), a denitrification tank (1), a denitrification tank (2), a nitration tank (2) and a settling tank (2), and when effluent in the settling tank (2) reaches the standard, the effluent is discharged; simultaneously, catering sewage flows into an oil separation tank to be treated, and the sewage in the oil separation tank flows into an adjusting tank (2); the catering sewage and the toilet flushing sewage share the denitrification tank (1) and the denitrification tank (2), and the treatment method of the catering sewage flowing into the denitrification tank (1) or the denitrification tank (2) is identical to that of the toilet flushing sewage flowing into the denitrification tank (1) or the denitrification tank (2); simultaneously, other sewage flows into the adjusting tank (1) or the adjusting tank (2); if the other sewage flows into the adjusting tank (1), the treatment method of the other sewage flowing into the adjusting tank (1) is identical to that of the toilet flushing sewage flowing into the adjusting tank (1); and if the other sewage flows into the adjusting tank (2), the treatment method of the other sewage flowing into the adjusting tank (2) is identical to that of the catering sewage flowing into the adjusting tank (2).

The invention discloses a magnesium ammonium phosphate-electrooxidation integrated device and a simultaneous nitrogen and phosphorus removing method thereof and belongs to the field of wastewater treatment.The magnesium ammonium phosphate-electrooxidation integrated device comprises a magnesium ammonium phosphate-electrooxidation crystallization system and a nitrogen electrooxidation system.The magnesium ammonium phosphate-electrooxidation crystallization system comprises a reaction base and an anode B.The nitrogen electrooxidation system comprises a reaction base and an anode A.Each reaction base comprises an electrochemical instrument, a selector switch, a reference electrode, scrap iron, a cathode and a reactor, wherein the reference electrode and the cathode are connected in parallel through wires and vertically suspended in the reactor after being connected with the electrochemical instrument, the scrap iron can be suspended in the reactor through magnetic force stirring, and the selector switch is connected with the electrochemical instrument through a wire and then are connected with the anode A and the anode B in a switching mode.Just through simple electrode switching, the simultaneous nitrogen and phosphorus removing effect can be achieved, operation is easy, automatic running can be achieved, and no new pollution sources are generated.

The invention provides a preparation method of ferro-manganese binary metallic oxide modified haydite for removing phosphorus. The method comprises the steps that 1, haydite is mixed with a potassium permanganate solution, and a ferrous sulfate solution is added in a stirring condition, wherein the mass-volume ratio of the haydite to the potassium permanganate solution is 8 g:10-30 mL, and the continuous stirring is conducted for 18-25 hours after the ferrous sulfate solution is added; 2, after stirring is completed, the haydite is separated from a reaction mixture to be dried, sintering is conducted on the dried haydite for 2-6 h at the temperature ranging from 280 DEG C to 550 DEG C, and the ferro-manganese binary metallic oxide modified haydite is obtained after the haydite is taken out and cooled. A ferro-manganese binary metallic oxide which is adopted by the prior art has the defect of being small in particle, according to the preparation method of the ferro-manganese binary metallic oxide modified haydite for removing the phosphorus, the ferro-manganese binary metallic oxide modified haydite is prepared according to the actual situation that water in a filter tank or a constructed wetland flows to wash padding in engineering applications, the ferro-manganese oxide and the haydite are combined tightly, the effect of removing the phosphorus is improved, the cost of removing the phosphorus is reduced, and the service life of the padding is prolonged.

The invention discloses a compound phosphorus removal flocculating agent for water treatment, which is compounded by red mud and calcium oxide. The flocculating agent is simple in preparation method,good in phosphor removal effect, low in agent cost, safe and reliable, suitable for a wide range of water treatment engineering and most suitable for treating phosphor-containing wastewater with highconcentration.

The invention provides a method for preparing magnesium aluminum hydrotalcite nanosheets in one step for adsorbing phosphorus removal, and belongs to the technical field of environmental protection. In the method, urea is used as a layer growth inhibitor, and the hydrotalcite nanosheets are prepared in one step in an aqueous urea solution. The preparation method controls the dropping rate to maintain pH constant by simultaneously adding a magnesium aluminum mixed salt solution and a sodium hydroxide solution to the aqueous urea solution, and after sufficient reaction, hydrotalcite nanosheet powder is obtained by centrifugation and lyophilization. A preparation process is simple, the production time is short, no organic solvent is used, and the method has the advantages of low cost, environmental friendliness and wide application range. The prepared hydrotalcite nanosheets have a large adsorption capacity and high phosphorus removal efficiency, and are adsorbent used for treating a highconcentration phosphorus-containing water body.

The invention discloses a preparation method of a lanthanum-loaded modified bentonite dephosphorization material. The preparation method comprises the steps as follows: performing ultrasonic treatmenton a lanthanum chloride solution in an alkaline environment, mixing the treated solution with bentonite, then, performing stirring and ultrasonic treatment, and finally, performing cleaning, filtration, grinding and sieving to obtain the lanthanum-loaded modified bentonite dephosphorization material. Compared with the prior art, the method has the advantages that selected raw materials are sufficient, natural, non-toxic, convenient to use and low in cost, the treatment process is simple, the treatment cost is lower, used raw materials are environment-friendly materials, secondary pollution isavoided, and meanwhile, the preparation time is obviously shortened. The dephosphorization material prepared with the preparation method of the lanthanum-loaded modified bentonite dephosphorization material has the phosphorus removal rate up to 90% or above and has characteristics of high efficiency, controllability and the like.

The invention relates to a compound chemical phosphorus removal agent for sewage and a preparation method thereof. The present chemical phosphorus removal agent is insufficient in action with phosphorous compounds in sewage, high in dosage, poor in phosphorus removal effect and high in phosphorus removal cost. The compound chemical phosphorus removal agent for sewage is a mixed solution of ferrous sulfate, aluminum trichloride, methanol and poly(dimethyl diallyl ammonium chloride); the preparation method of the agent comprises the following steps: putting FeSO4.7H2O and AlCl3.6H2O solids in a mass ratio in a reactor so as to react to obtain a ferrous sulfate-aluminum chloride liquid, adding industrial methanol to the ferrous sulfate-aluminum chloride liquid, next, adding the poly(dimethyl diallyl ammonium chloride) according to a ratio of the poly(dimethyl diallyl ammonium chloride) to the ferrous sulfate-aluminum chloride liquid obtained in the first step, and mixing and stirring to obtain the compound chemical phosphorus removal agent for sewage. The compound chemical phosphorus removal agent for sewage has the characteristics of good phosphorus removal effect and simultaneous consideration to denitrification, and thus can be widely applied to the fields of industrial wastewater treatment and domestic wastewater treatment, and has excellent water treatment effect.

The invention discloses a removing method for phosphorus in acid vanadium leaching liquid. The pH value of the acid vanadium leaching liquid is 2.5-4.0; and the concentration of phosphorus is 0.3-1.5g / L. In the method, an oxidizing agent A is used for oxidizing the acid vanadium leaching liquid; A is one of NaClO, HClO, H2O2, KMnO4 or (NH4)2S2O8; a phosphorus removing agent is a composite phosphorus removing agent, and mainly consists of B and C components; the B component is one of [Fe(OH)n(SO4)m]q, FeSO4 and Fe2(SO4)3, wherein n is not more than 2 and not less than 0.5, m is not more than 3and not less than 1, and q is not more than 100000 and not less than 10; the C component is one of Al2(SO4)3, MgO, CaO, ZrSO4 and PbSO4; the mole ratio of the B component and the C component to phosphorus in the acid vanadium leaching liquid is 0.1-3: 1; and the mole ratio of the C component to phosphorus in the acid vanadium leaching liquid is 0.1-3: 1. The method removes phosphorus through adding of the composite phosphorus removing agent after oxidation by adding the oxidizing agent in the acid vanadium leaching liquid. Compared with the prior art, the removing method has the advantages ofsimple process, high phosphorus removing efficiency and stable phosphorus removing effect.

The invention discloses a sectionalized sewage treatment tank using a cyclic activated sludge system. The sewage treatment tank comprises a tank body; the tank body is provided with a water inlet, a water outlet and a surplus sludge discharge outlet and is partitioned by division plates into a pre-anaerobic zone, an anaerobic zone, an anoxic zone and an aerobic zone which are of different volumes, wherein the volume of the aerobic zone is greater than the volume of the anoxic zone, and the volume of the anoxic zone is greater than the volume of the anaerobic zone; stirrers are respectively arranged in the pre-anaerobic zone, the anaerobic zone and the anoxic zone; an aeration device, an aerobic sludge circulating pump and a water decanter are installed in the aerobic zone; sludge flows back in two stages, wherein the sludge is recycled from the aerobic zone to the anoxic zone in the first stage and then flows back from the anoxic zone to the pre-anaerobic zone in the second stage. According to the invention, sectionalized and staged cycling of the sludge enables anaerobic and anoxic states to be optimal, phosphorus accumulating organisms, anti-denitrifying bacteria and nitrobacteria in the sludge can realize phosphorus removal and nitrogen removal under optimal conditions, and therefore, a good nitrogen, phosphorus and organic matter removal effect is achieved.

The invention provides a sewage treatment method based on an improved A2O process, belonging to the technical field of sewage treatment. The method concretely comprises the steps of enabling sewage tosequentially pass through an anaerobic pool, an anoxic pool, an aerobiotic pool and a secondary sedimentation tank; mixing reflux mixed liquid in the aerobiotic pool with inlet water of the anaerobicpool, and then enabling the mixed liquid to enter the anaerobic pool for treating; inoculating the anaerobic pool with domesticated anaerobic sludge. Total nitrogen is removed by means of a combinedaction of anammox bacteria and denitrifying bacteria, so that the nitrogen removal ability is high; furthermore, the bacteria do not compete with phosphorus-accumulating bacteria for a carbon source and a growth space, so that the phosphorous removal efficiency is high. The method solves the problem of contradiction of carbon source competition between the phosphorus-accumulating bacteria and thedenitrifying bacteria and sludge age difference in an anaerobic pool of the traditional A2O process.

The invention relates to the technical field of sewage treatment, in particular to an intelligent dosing control system based on a BP neural network. The intelligent dosing control system comprises: awater inflow flowmeter for collecting a water inflow value; a tester for total phosphorus in inflow water, wherein the tester is used for collecting a total phosphorus value of the inflow water; an improved ATV phosphorus removal model, wherein the water inflow value and the total phosphorus value of the inflow water are substituted in the improved ATV phosphorus removal model for real-time calculation so as to obtain a dosing trend value and a dosing amount; a tester for total phosphorus in , wherein the tester collects a total phosphorus value of the effluent; a BP neural network adjustmentmodule, wherein the received dosing amount and the total phosphorus value of the effluent are substituted in the BP neural network adjustment module for calculation so as to obtain a dosing amount correction value; a PLC control module, which is used for converting the dosing amount correction value into a corresponding control signal; and a dosing pump, which is used for carrying out dosing according to the control signal. According to an embodiment of the invention, the dosing trend value and the dosing amount are calculated in real time by collecting the water inflow value and the total phosphorus value of the inflow water; the dosing amount and the total phosphorus value of the effluent are substituted in the model for calculation so as to obtain the dosing amount correction value; the system controlled to dose a clarification tank according to the dosing amount correction value; and thus, the phosphorus removal efficiency of inflow water of the clarification tank is improved.

The invention belongs to the technical field of water environment restoration and particularly relates to a regeneration method for urban sewage by continuous flow. In view of the problems existing in a conventional simultaneous nitrogen and phosphorus removal process of serious shortage of carbon sources due to competition for carbon sources in nitrogen and phosphorus removal, big differences in sludge ages of a denitrifier and phosphorus removal bacteria and demand for dissolved oxygen, insufficient alkalinity of sewage, difficulty in giving consideration to nitrogen and phosphorus removal effects concurrently and the like, through overall planning from the process flow and optimization of tasks of all processing units, the regeneration method can be used for removing phosphorus and organic matters by an anaerobic-aerobic process, partially oxidizing ammonia and nitrogen into nitrite nitrogen by a multistage completely hybrid nitrosation process, and realizing autotrophic denitrification by using an upward-flow anaerobic ammonia oxidation biofilter so as to achieve high-efficient low-carbon treatment and regeneration of the sewage, with effluent COD less than 45 mg / L, BOD less than 10 mg / L, TP less than 0.4 mg / L, and TN less than 10 mg / L, so that the treated sewage can reach the national primary standard A.

The invention discloses an integrated small and medium multi-point water inflowing deep nitrogen and phosphorus removal sewage processing system and a processing method. The system and method are mainly used for processing high-concentration town sanitary sewage and high-concentration industrial waste water, especially COD, sanitary sewage with high ammonia nitrogen content or industrial waste water. The processing system comprises a grating adjusting pond, an aeration tank, a first anoxic pond, a first aerobic pond, a second anoxic pond, a second aerobic pond, a precipitating pond, a flocculation reaction pond and a flocculation precipitating pond which are successively communicated. The multi-point water inflowing mode is adopted, water resources are reasonably utilized, and the system has the advantages of being low in cost, efficient, capable of resisting loading and impacting, stable in quality of discharged water, convenient to operate and manage, and beneficial for integrated construction and saving of occupied area.

The invention relates to a dephosphorization technique for sewage organisms in an intermittent air-exposition biologic filtering pond, with the adoption of a sewage treatment system orderly consisting of a fixed bed anaerobic biologic filtering pond and an intermittent air-exposition biologic filtering pond. The intermittent air-exposition biologic filtering pond discharges an anaerobic reaction liquid rich in phosphor, namely, the anaerobic liquid rich in phosphor, when the anaerobic phase comes to an end, and the water is taken in continuously during the aerobic phase. Two intermittent air-exposition biologic ponds are aligned, and two filtering ponds are crossed for work. Each intermittent air-exposition biologic pond circularly works according to the time limit of the arranged intermittent air exposition period, and the whole system achieves the continuous water intake and outtake. The technique has simple and convenient operation and lowoperational cost, and can effectively eliminate the phosphor in the sewage. Compared with the prior dephosphorization technique, the invention adopts the method of the discharge of the anaerobic liquid rich in phosphor rather than the aerobic biologic cells rich in phosphor to remove the phosphor in the intermittent air-exposition biologic filtering pond. The dephosphorization property of the reactor does not depend on the anti-washing, the work period of the reactor is effectively prolonged, and the energy consumption during the anti-washing of the filtering pond is reduced.

The invention discloses a treatment method and device for nitrogen and phosphorus removal of rural domestic wastewater. The treatment method comprises the following steps: 1) collecting the domestic wastewater by utilizing a regulating tank and simultaneously performing water quantity homogeneous regulation; 2) degrading organic matters and removing nitrogen and phosphorus: controlling a biochemical reaction tank by utilizing a control system and performing water intake / drainage-anaerobic-aerobic step sequence operation on the wastewater entering the biochemical reaction tank to realize organic matter degradation and nitrogen and phosphorus removal; 3) performing sludge discharge treatment: adopting a forced sludge discharge method at the later aerobic stage, discharging activated sludge with high phosphorus content formed in the biochemical reaction tank at the later aerobic stage to a sludge tank for storage through a sludge pump and conveying to a sludge treatment plant for treatment through a sludge suction tanker regularly; and 4) draining clear water at the top of the biochemical reaction tank into a clear water tank in the water intake / drainage steps and discharging throughan efflux pump after the clear water in the clear water tank is sterilized by a sterilizing device. The method for the nitrogen and phosphorus removal of the rural domestic wastewater, disclosed by the invention, has the benefit that as moving equipment is less, the maintenance expense is low, and the running expense is lower than 0.25 yuan / ton.

The invention discloses a magnetically induced crystallization method and apparatus for removal and recovery of phosphorus in wastewater. A magnetically induced crystallization reaction apparatus comprises a reactor, a drug restore tank, a water tank and a blower. The reactor comprises a mixing zone, a reaction zone and a settling zone. A flap mixing apparatus is arranged in the mixing zone to lay a good foundation for the induction crystallization reaction; porous alkaline slag rich in Ca<2+> and electrolytic manganese slag are used as a composite induction seed to create a favorable conditions for the induction crystallization reaction; a magnetic field is added, and the magnetic force is favor of OH. generation, thereby promoting crystal growth; and magnetic force and iron in composite seed form a magnetic flocculation effect, thereby improving the separation effect of crystals and water, and improving the efficiency of phosphorus removal. The invention does not change the process of the wastewater treatment plant in the prior art, removes and recycles phosphorus in sludge dewatering filtrate and sludge nitrification liquid, has the advantages of simple equipment, simple operation, and simple control, and is conducive to production implementation.

The invention provides a method for carrying out nitrogen and phosphorus removal on municipal sewage municipal sewage. The method comprises the following steps: (1), carrying out anaerobic ammonia oxidation and phosphorus release treatment of short-cut denitrification phosphorus-accumulating bacteria on sewage in an anaerobic tank to obtain muddy water mixed liquor; (2), settling the obtained muddy water mixed liquor in a quick settling tank, firstly carrying out short-cut denitrification phosphorus-absorbing treatment on the obtained sludge, and then carrying out secondary settling in a secondary settling tank; firstly transferring the obtained liquid supernatant to a micro aerobic tank, carrying out oxidization treatment of ammonia nitrogen, then transferring to an anoxic tank, carrying out short-cut denitrification phosphorus-absorbing treatment, and finally carrying out secondary settling in the secondary settling tank; (3), refluxing nitrite mixed liquor produced by the micro aerobic tank to the anaerobic tank; (4), refluxing the sludge obtained by secondary settling to the anaerobic tank, wherein a liquid supernatant is the sludge obtained after nitrogen and phosphorus removal. The method disclosed by the invention can be used for not only realizing efficient nitrogen and phosphorus removal, but also greatly lowering energy consumption and material consumption in a sewage treatment process, and is especially suitable for treating low C / N (carbon / nitrogen) municipal sewage.

The invention discloses a constructed rapid infiltration pond and an application thereof in decentralized treatment of rural domestic sewage. An artificial filter material which is manually configured is filled in the constructed rapid infiltration pond, and is produced by mixing granular river sand and sponge iron according to the volume ratio of 5 to 1. Compared with the prior art, the constructed rapid infiltration pond can effectively improve phosphorus removal efficiency on the basis of effectively degrading and denitriding organic substances, so that the cost is lowest when the outlet water quality standard of sewage achieves the primary A standard in Pollutants Emission Standard of Urban Wastewater Treatment Firm (GB18918-2002).

The invention discloses electrolytic dephosphorization equipment and in particular discloses electrolytic dephosphorization equipment with an aerating device, belonging to wastewater treatment technology and equipment. The electrolytic dephosphorization equipment is characterized in that a water inlet pipe is arranged on one side of the upper part of an electrolytic tank; a water outlet pipe is arranged on the lower part of the other side of the electrolytic tank; circular electrode plates installed on a rotating shaft are arranged above the electrolytic tank; one of the electrode plates is an aluminium plate and the other one is an iron plate; the electrode plates are connected with a direct-current power supply; and the aerating device is installed at the bottom of the electrolytic tank and is connected with a blower by a gas pipe. The electrolytic dephosphorization equipment is simple and reasonable to operate and achieves unattended operation, and compared with the traditional electrolytic dephosphorization equipment and chemical dephosphorization methods, which need manpower to dispense drugs and switch valves, the electrolytic dephosphorization equipment saves time and labor, improves the dephosphorization efficiency, reduces the operation cost and is more energy-saving and environment-friendly.

The invention provides a phosphorus removal material and a preparation method thereof. According to the phosphorus removal material, a phosphorus removal surface layer with the phosphorus removal effect coats a construction aggregate, phosphorus in water can be effectively removed by mixing the phosphorus removal material and phosphorus-containing sewage, and then the technical problems that in an existing phosphorus removal method is poor in phosphorus removal effect and secondary pollution is easily caused can be solved; the phosphorus removal material has the advantages that the phosphorus removal effect is good, the phosphorus removal efficiency is high and no secondary pollution is caused. Meanwhile, the invention further provides the preparation method of the phosphorus removal material. According to the method, after the phosphorus removal compound in the raw material and the construction aggregate are mixed and then broken and smashed to prepare the phosphorus removal material, the method has the advantage of being simple and convenient to implement, and the obtained phosphorus removal material has the advantages of being uniform in structure, good in phosphorus removal effect and the like.