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 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 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.

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 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 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 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 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 discloses a treatment method and device for denitrification and dephosphorization of rural domestic sewage, wherein the method comprises: 1) using a regulating tank to collect domestic sewage, and at the same time adjusting the water volume homogeneously; 2) degrading organic matter and denitrifying and dephosphorizing , use the control system to control the biochemical reaction tank to run the steps of water intake/drainage-anoxic-aerobic sequence for the sewage entering the interior, so as to realize the degradation of organic matter and the removal of nitrogen and phosphorus. 3) Sludge treatment, in the late stage of aerobic stage The method of forced sludge discharge is carried out, and the activated sludge with high phosphorus content formed in the late aerobic stage in the biochemical reaction tank is discharged to the sludge tank for storage through the sludge pump, and is regularly sent to the sludge treatment plant by the suction tank truck for treatment; 4 ) In the water inlet/drainage step, the clear water at the top of the biochemical reaction tank is discharged to the clear water tank, and the clear water in the clear water tank is discharged by the external discharge pump for use after passing through the disinfection device. The method for denitrification and dephosphorization of domestic sewage in rural areas has less moving equipment and low maintenance cost, and the operating cost is as low as 0.25 yuan/ton.

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).