CN213446720U - Device of high-efficient dephosphorization in AO technology - Google Patents
Device of high-efficient dephosphorization in AO technology Download PDFInfo
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- CN213446720U CN213446720U CN202022142706.5U CN202022142706U CN213446720U CN 213446720 U CN213446720 U CN 213446720U CN 202022142706 U CN202022142706 U CN 202022142706U CN 213446720 U CN213446720 U CN 213446720U
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Abstract
The utility model discloses a device of high-efficient dephosphorization in AO technology, through crossing water hole UNICOM between anaerobism pond and the aerobic tank, the end in anaerobism pond encloses through still water district baffle and is equipped with still water district, top in the still water district is provided with the perforation and receives the water pipe, and the upside distribution that should perforate to receive the water pipe has the hole of receiving, the position of crossing the water hole is higher than the position of receiving the water hole, it links to each other with the first sewage pipe on coagulating basin upper portion to perforate to receive the water pipe to wear out anaerobism pond, still be provided with on the first sewage pipe and add medicine branch pipe, sewage part or whole in the anaerobism pond receive the water pipe through perforating and get into coagulating basin, coagulating basin's lower part is provided with the second sewage pipe and links to each other with coagulating sedimentation tank, coagulating sedimentation tank's upper portion is provided with the third sewage pipe and. The device of the utility model has the characteristics of investment saving, high medicament utilization rate, low operating cost, simple and convenient operation, stable effect and the like.
Description
Technical Field
The utility model relates to a device of high-efficient dephosphorization in AO technology belongs to water treatment facility field.
Background
The chemical phosphorus removal is that inorganic metal salt is added into the sewage to react with soluble salt (such as phosphate) in the sewage to generate insoluble precipitate, the insoluble precipitate is aggregated into floccules with larger particles under the action of a flocculating agent, and the aim of phosphorus removal is achieved after solid-liquid separation. Wherein, the flocculating agent is added to lead insoluble phosphate solid particles with small particle size to be aggregated into large particles which are easy to settle, thereby improving the precipitation effect.
The chemical agents used for chemical phosphorus removal are mainly metal salts and calcium hydroxide. After the high-valence metal ion medicament is added into the sewage, the high-valence metal ion medicament can be combined with phosphorus salt ions dissolved in the sewage to generate an insoluble compound containing Fe3+、Fe2+And Al3+Salts are widely used in phosphorus precipitation operations due to their low cost, and these agents exist mainly in the form of solutions and suspensions. In addition, calcium hydroxide is also used as a precipitating agent, and reacts to form calcium phosphate which is insoluble in water.
1. Aluminum salt phosphorus removal equation:
Al2(SO4)3+6H2O→2Al(OH)3+3SO4 2-+6CO2
Al2(SO4)3+2PO4 3-→2AlPO4+3SO42-
under the condition of controlling the pH value to be 6.0-6.5, theoretically, 1.5-3.0mol of aluminum is added for every 1mol of phosphorus. The pH should not be too high throughout to reduce Al (OH)3And (4) precipitating.
2. Iron salt dephosphorization equation:
Fe2(SO4)3+3HCO3-→Fe(OH)3+2SO42-+3CO2
Fe3++PO43-→FePO4↓(pH＝5～5.5)
iron Fe is added for every 1mol of phosphorus3+1.5-3mol, and the optimal pH value is 5.0. For the secondary treatment water with the phosphorus content of about 5mg/l, 100-200 mg/l ferric chloride (FeCl) is added3.6H2O) can achieve a phosphorus removal rate of 90% or more. The metal hydroxide forms large floccules which are beneficial to flocculation of the precipitation product and can adsorb colloidal substances and fine suspended particles. It is to be noted that the settling removal of organic matter in chemical settling reactions for the purpose of chemical phosphorus removal is of secondary importance, but the coagulation of organic colloids as well as suspended matter in the flocs is the decisive process in the separation.
The precipitation effect is influenced by the pH, as is the solubility of the metal phosphate. The optimal pH value range of the ferric salt is 5.0-5.5; aluminum salt is 6.0 to 7.0, since FePO is in the above pH range4Or AlPO4The solubility of (c) is minimal. In addition, the metal salt medicament has other advantages, such as reduction of sludge index of sludge, contribution to methane desulfurization and the like. The addition of the metal salt can lead Cl in the effluent of a sewage treatment plant-Or SO4 2-The ion content increases. Particular attention is paid if the precipitant solution contains an acid.
The alkalinity of the sewage is correspondingly reduced after the metal salt medicament is added, which may have adverse effect on the purification. When using iron sulphate in a simultaneous precipitation process, the influence on the nitration reaction has to be taken into account. In addition, if sewage treatment plant sludge is used in agriculture, the effect of aluminum or iron loading on agriculture must be considered when using metal salts to remove phosphorus.
3. Lime phosphorus removal equation:
5Ca2++4OH-+3HPO4 2-→Ca5OH(PO4)3+3H2O
for removing phosphorusThe rate reaches more than 90 percent, and the pH value is controlled to be more than 10.5-11.0. The weight ratio of Ca/P is 2.2: 1 or more. During precipitation, not Ca, which is essential for the formation of insoluble calcium phosphate2+And is OH-Ions, since the solubility of calcium phosphate decreases with increasing pH, Ca (OH) is used2The pH value required by phosphorus removal is more than 8.5.
However, in the pH range of 8.5 to 10.5, calcium carbonate is produced in addition to calcium phosphate, which may lead to scaling of the walls of the basin or canals or pipe walls. The reaction of phosphate precipitation with calcium is affected by the bicarbonate concentration (alkalinity) in addition to the PH. Under certain pH value, the adding amount of calcium is proportional to alkalinity. For soft or medium-hard sewage, when calcium precipitation is used, the amount of calcium required to achieve the required pH is small, and sewage with strong buffering capacity requires a large amount of added calcium.
4. Chemical phosphorus removal process
The chemical phosphorus removal process can be classified according to the adding place of chemical agents, and the chemical phosphorus removal process is usually adopted in practice as follows:
preposed dephosphorization, synchronous dephosphorization and postpositive dephosphorization.
1) The preposed dephosphorization process is characterized in that chemical agents are added into a grit chamber, a water inlet channel (pipe) of a primary sedimentation tank or a Venturi channel (utilizing vortex). It is generally necessary to provide a means of generating the vortex or to supply energy to meet the mixing requirements. The resulting precipitate (large clumps of flocs) is separated by sedimentation in the primary sedimentation tank.
If the biological section adopts a biological filter, an iron salt agent is not allowed to be used so as to prevent the harm to the filler (the generation of yellow rust). The preposed dephosphorization process is suitable for reconstruction of the existing sewage treatment plant because only a chemical dephosphorization measure is added at the front end of the existing process, and the process step can not only remove phosphorus, but also reduce the load of biological treatment facilities.
The commonly used chemical agents are mainly lime and metal salt agents. After the preposed dephosphorization, the content of the residual phosphate is controlled to be 1.5-2.5mg/L, and the requirement of the follow-up biological treatment on the phosphorus can be completely met.
2) The synchronous phosphorus removal is the most widely used chemical phosphorus removal process at present, and accounts for about 50 percent of all chemical phosphorus removal processes abroad. The process is to add chemical agents into the effluent of an aeration tank or the influent of a secondary sedimentation tank (after AO reaction). At present, the synchronous chemical phosphorus removal method can be adopted for the activated sludge process and the biological rotating disk process, but whether the medicament can be added into the inlet water of the secondary sedimentation tank or not is worth discussing for the biological filter process.
3) The postpositive dephosphorization is carried out in a facility separated from the biological treatment by settling out, flocculation and separation of flocculated substances, so the process is also called as a two-stage process. Generally, a chemical agent is added into a mixing tank behind a secondary sedimentation tank, and a flocculation tank and a sedimentation tank (or an air flotation tank) are arranged behind the chemical agent.
For the receiving water body with low requirement, lime emulsion agent can be adopted in the post-dephosphorization process, but the pH value of the effluent needs to be controlled, for example, CO can be adopted2And (4) neutralizing. The use of an air flotation tank allows better removal of suspended matter and total phosphorus than a sedimentation tank, but is more expensive to operate because of the constant supply of air required.
However, at the present stage, when a preposed phosphorus removal mode is adopted, the concentration of phosphorus in the wastewater is the concentration of phosphorus in the quality of the inlet water.
The post-phosphorus removal mode is a phosphorus removal mode in which a phosphorus removal process is set after biological treatment phase separation, and the phosphorus content in the wastewater after biological treatment is less than or equal to the water inflow.
The synchronous phosphorus removal process is characterized in that a chemical agent is added into the effluent of an aeration tank or the influent of a secondary sedimentation tank after biological treatment, the phosphorus content in the wastewater is less than or equal to the water inflow, and the chemical agent is directly added into the activated sludge mixed solution for synchronous phosphorus removal, so that the reaction of the phosphorus removal agent and phosphate radical is influenced, and the activity of the activated sludge is influenced.
The phosphorus removal agent is added when the phosphorus content in the wastewater is lower no matter the pre-phosphorus removal, the synchronous phosphorus removal and the post-phosphorus removal are all phosphorus removal agents, so that the reaction efficiency of the phosphorus removal agents is greatly reduced, the use of the phosphorus removal agents is increased, the addition coefficient of the phosphorus removal agents in the practical operation can reach 2-4, and the use cost of the agents of the sewage treatment station is greatly increased.
SUMMERY OF THE UTILITY MODEL
To the technical problem, an object of the utility model is to provide a device of high-efficient dephosphorization in AO technology, compare with traditional chemical dephosphorization, the reaction efficiency of dephosphorization agent is high, and the medicament use amount is few, and dephosphorization is effectual.
In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a device of high-efficient dephosphorization in AO technology, includes anaerobism pond and aerobic tank, through water hole UNICOM between anaerobism pond and the aerobic tank, be provided with the mud back flow on the aerobic tank and link to each other its characterized in that with the anaerobism pond: the tail end of the anaerobic tank is surrounded by a still water area extending from top to bottom through a still water area baffle, the water inlet of the still water area is positioned at the middle lower part of the anaerobic tank, a perforated water receiving pipe is arranged at the upper part of the still water area, a water receiving hole for allowing water to flow into the perforated water receiving pipe is distributed at the upper side of the perforated water receiving pipe, the position of the water passing hole is higher than the position of the water receiving hole, the perforated water receiving pipe penetrates out of the anaerobic tank to be connected with a first sewage pipe positioned at the upper part of a coagulation reaction tank, an electromagnetic valve for adjusting the amount of sewage entering the perforated water receiving pipe is arranged on the first sewage pipe, a medicine adding branch pipe is further arranged on the first sewage pipe, a stirring device is arranged in the coagulation reaction tank, the part or the whole sewage in the anaerobic tank enters the coagulation reaction tank through the perforated water receiving pipe, a second sewage pipe is arranged at the lower part, and the upper part of the coagulating sedimentation tank is provided with a third sewage pipe connected with the aerobic tank.
In the scheme, the method comprises the following steps: separate through vertical baffle between anaerobism pond and the good oxygen pond and establish, still water district baffle includes the vertical first baffle and the side shield that extend of top-down, the width of first baffle is less than the width in anaerobism pond, the well lower part in anaerobism pond is stretched to the lower extreme of first baffle, and is gapped between this first baffle and the vertical baffle, and one side of this first baffle is fixed on the lateral wall in anaerobism pond, links to each other through the side shield between opposite side and the vertical baffle, the curb plate in first baffle, side shield, vertical baffle and anaerobism pond encloses into still water district, cross the water hole setting on vertical baffle, and be located outside the still water district.
In the scheme, the method comprises the following steps: the lower part of first baffle forms the second swash plate to the direction slope that is close to vertical baffle, the water inlet below in stagnant water district is provided with first swash plate, and the one end of this first swash plate is fixed on vertical baffle, and the other end downward sloping extends to the below of the vertical section of first baffle, the lower part of first baffle forms the second swash plate to the direction slope that is close to vertical baffle, and is gapped between this second swash plate and the first swash plate, the water in anaerobism pond gets into stagnant water district through the clearance between first swash plate and the second swash plate. The arrangement of the first inclined plate and the second inclined plate is beneficial to the precipitation of sludge.
In the scheme, the method comprises the following steps: the coagulating sedimentation tank is internally provided with a vertically extending guide cylinder, the second sewage pipe is connected with a water inlet on the upper part of the guide cylinder, a bell mouth is arranged on a water outlet on the lower part of the guide cylinder, and a water outlet on the lower part of the guide cylinder extends to the upper part of a mud bucket at the bottom of the coagulating sedimentation tank. Thus avoiding the disturbance of bottom sludge by the inlet water.
In the scheme, the method comprises the following steps: and a sludge discharge pipe is arranged on the bottom sludge hopper of the coagulating sedimentation tank. The sludge in the coagulating sedimentation tank is discharged through the sludge discharge pipe.
In the scheme, the method comprises the following steps: the upper portion of coagulating sedimentation jar is provided with the round weir of receiving, and this weir of receiving encloses into annular drainage district on coagulating sedimentation jar's upper portion, coagulating sedimentation jar's supernatant turns over and gets into annular drainage district behind the weir, third sewage pipe and annular drainage district UNICOM.
Has the advantages that: the utility model discloses compare traditional dephosphorization system characteristics and carry out chemical dephosphorization earlier after AO anaerobic reaction, at this moment, phosphorus content is high in the sewage (the mud of good oxygen pond fully absorption phosphorus flows back to the anaerobism pond, releases phosphorus in the anaerobism pond to the sewage), and the dephosphorization of the phosphorus removal agent that adds like this is efficient, and the addition can significantly reduce, and the working costs is low. The sewage after chemical dephosphorization enters an aerobic tank to carry out aerobic reaction under the action of activated sludge, and a small amount of phosphorus in the sewage is absorbed under the action of the activated sludge to achieve the effect of deep dephosphorization. The device of the utility model has the characteristics of investment saving, high medicament utilization rate, low operating cost, simple and convenient operation, stable effect and the like.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a sectional view B-B of fig. 1.
Fig. 4 is a cross-sectional view taken along line C-C of fig. 1.
Detailed Description
The invention will be further described by way of examples with reference to the accompanying drawings:
example 1, as shown in fig. 1 to 4, an apparatus for removing phosphorus efficiently in an AO process is composed of an anaerobic tank 1, an aerobic tank 2, a water through hole 3, a vertical partition plate 4, a still water region a, a perforated water collecting pipe 5, a water collecting hole 5a, a first baffle plate 6, a side baffle plate 7, a first inclined plate 8, a second inclined plate 9, a coagulation reaction tank 10, a first sewage pipe 11, an electromagnetic valve 12, a dosing branch pipe 13, a stirring device 14, a second sewage pipe 15, a coagulation sedimentation tank 16, a third sewage pipe 17, a draft tube 18, a bottom mud bucket 19, a mud pipe 20 and a water collecting weir 21.
The anaerobic tank 1 and the aerobic tank 2 can be separately arranged, and for the convenience of arrangement, in the embodiment, the anaerobic tank 1 and the aerobic tank 2 are separated by a vertical partition plate 4. The anaerobic tank 1 is communicated with the aerobic tank 2 through a water through hole 3, and the water through hole 3 is arranged on a vertical partition plate 4.
The aerobic tank 2 is provided with a sludge return pipe (the sludge return pipe is not shown in the figure) which is connected with the anaerobic tank 1, the tail end of the anaerobic tank 1 is surrounded by a still water area A extending from top to bottom through a still water area baffle, the still water area baffle comprises a first baffle 6 and a side baffle 7 extending vertically from top to bottom, the width of the first baffle 6 is less than that of the anaerobic tank 1, the lower end of the first baffle 6 extends to the middle lower part of the anaerobic tank 1, a gap is reserved between the first baffle plate 7 and the vertical clapboard 4, one side of the first baffle plate 6 is fixed on the side wall of the anaerobic tank 1, the other side is connected with the vertical clapboard 4 through the side baffle plate 7, the first baffle plate 6, the side baffle plate 7, the vertical clapboard 4 and the side plate of the anaerobic tank 1 enclose a still water area A, the water inlet of the still water area A is positioned at the middle lower part of the anaerobic tank 1, and the water passing holes 3 are arranged on the vertical partition plate 4 and positioned outside the still water area A. In order to facilitate the precipitation of sludge, the lower part of the first baffle 6 forms the second swash plate 9 to the direction slope that is close to the vertical baffle 4, still water district A's water inlet below is provided with first swash plate 8, this first swash plate 8's one end is fixed on vertical baffle 4, the other end downward sloping extends to the below of the vertical section of first baffle 6, it is gapped between second swash plate 9 and the first swash plate 8, the water of anaerobism pond 1 gets into still water district A through the clearance between first swash plate 8 and the second swash plate 9.
A perforated water receiving pipe 5 is arranged at the upper part in the still water area A, water receiving holes 5a are distributed at the upper side of the perforated water receiving pipe 5, the position of the water passing hole 3 is slightly higher than the position of the water receiving holes 5a, the perforated water receiving pipe 5 penetrates out of the anaerobic tank 1 to be connected with a first sewage pipe 11 positioned at the upper part of the coagulation reaction tank 10, an electromagnetic valve 12 for adjusting the sewage amount entering the perforated water receiving pipe 5 is arranged on the first sewage pipe 11, a medicine adding branch pipe 13 is also arranged on the first sewage pipe 11, a stirring device 14 is arranged in the coagulation reaction tank 10, part or all of the sewage in the anaerobic tank 1 enters the coagulation reaction tank 10 through the perforated water receiving pipe 5, the water amount entering the perforated water receiving pipe 5 can be adjusted according to the electromagnetic valve 12, meanwhile, if the water amount entering the perforated water receiving pipe 5 is small, the rest of water directly enters the aerobic tank 2 from the water passing hole 3, a second sewage pipe 15 arranged at the lower, the upper part of the coagulating sedimentation tank 16 is provided with a third sewage pipe 17 which is connected with the aerobic tank 2. A guide shell 18 extending vertically is arranged in the preferable coagulating sedimentation tank 16, a second sewage pipe 15 is connected with a water inlet at the upper part of the guide shell 18, a bell mouth is arranged on a water outlet at the lower part of the guide shell 18, and a water outlet at the lower part of the guide shell 18 extends to the upper part of a mud bucket 19 at the bottom of the coagulating sedimentation tank 16. A sludge discharge pipe 20 is arranged on a sludge hopper 19 at the bottom of the coagulating sedimentation tank 16. The upper portion of coagulating sedimentation tank 16 is provided with round weir 21 of receiving, and this weir 21 of receiving encloses at coagulating sedimentation tank 16's upper portion and becomes annular drainage district, and coagulating sedimentation tank 16's supernatant turns over behind weir 21 and gets into annular drainage district, and third sewage pipe 17 and annular drainage district UNICOM.
Activated sludge which is fully absorbing phosphorus in the aerobic tank 2 flows back to the anaerobic tank 1, phosphorus in cells is fully released into sewage by using a carbon source of inlet water in the anaerobic tank 1, and when the phosphorus content in the sewage in the anaerobic tank 1 is the highest in the whole sewage treatment system, a chemical phosphorus removing agent is added, and when the same amount of phosphorus is removed, the added phosphorus removing agent is the least, and the phosphorus removing agent has the highest reaction utilization rate with the phosphorus in the sewage.
Set up still water district A at anaerobism 1 end, the muddy water separation is realized at still water district A to the mixed liquid in the anaerobism pond 1, the supernatant after the separation enters into perforation through receiving water hole 5a and receives water pipe 5, and enter into coagulation reaction tank 10 through first sewage pipe 11, simultaneously a small amount of ageing activated sludge and impurity in the activated sludge enter into coagulating sedimentation jar 16 along with the supernatant and get rid of, activated sludge in the anaerobism pond 1 can be avoided like this and subsequent phosphorus removal reaction device is entered into, also can get rid of the impurity of mixing in the activated sludge the inside in the system, can keep activated sludge's activity. Meanwhile, the tail end of the anaerobic tank 1 is also provided with a water through hole 3, so that the mixed liquid in the anaerobic tank 1 simultaneously enters the aerobic tank 2 for subsequent aerobic biological reaction, and the amount of the entering water can be adjusted by the opening degree of an electromagnetic valve 12 on the first sewage pipe 11. The supernatant entering the first sewage pipe 11 is mixed with the phosphorus removing agent entering from the dosing branch pipe 13 and enters the coagulation reaction tank 10, the mixture is subjected to a sufficient coagulation reaction under the action of a coagulation stirrer 14, at the moment, free phosphate ions in the wastewater and the phosphorus removing agent are sufficiently reacted to generate a precipitate, the precipitate is subjected to a complete coagulation reaction and then enters the coagulation sedimentation tank 16 through the second sewage pipe 15 and the guide cylinder 18 for sludge-water separation, the precipitate containing a large amount of phosphate ions enters the bottom sludge hopper 19 and is periodically discharged to a post-positioned sludge disposal system through the sludge discharge pipe 20, the supernatant subjected to sludge-water separation in the coagulation sedimentation tank 16 is discharged into the aerobic tank 2 through the water receiving weir 21 and the third sewage pipe 17 for subsequent aerobic biological reaction, at the moment, most of phosphorus in the supernatant separated from the coagulation sedimentation tank 16 is subjected to coagulation reaction and is generated and removed, the phosphorus content is low, and the activated sludge in the aerobic tank 2 can be subjected to excessive and sufficient phosphorus absorption under the aerobic condition, finally, the free phosphate ions in the wastewater are very few, so that the requirement of standard discharge of the subsequent wastewater TP is concealed, and the effect of deep phosphorus removal is achieved. And the activated sludge which fully releases phosphorus in the anaerobic tank flows back to the aerobic tank to continuously absorb phosphorus.
The present invention is not limited to the above embodiments, and those skilled in the art can understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. The utility model provides a device of high-efficient dephosphorization in AO technology, includes anaerobism pond and aerobic tank, through water hole UNICOM between anaerobism pond and the aerobic tank, be provided with the mud back flow on the aerobic tank and link to each other its characterized in that with the anaerobism pond: the tail end of the anaerobic tank is surrounded by a still water area extending from top to bottom through a still water area baffle, the water inlet of the still water area is positioned at the middle lower part of the anaerobic tank, a perforated water receiving pipe is arranged at the upper part of the still water area, a water receiving hole for allowing water to flow into the perforated water receiving pipe is distributed at the upper side of the perforated water receiving pipe, the position of the water passing hole is higher than the position of the water receiving hole, the perforated water receiving pipe penetrates out of the anaerobic tank to be connected with a first sewage pipe positioned at the upper part of a coagulation reaction tank, an electromagnetic valve for adjusting the amount of sewage entering the perforated water receiving pipe is arranged on the first sewage pipe, a medicine adding branch pipe is further arranged on the first sewage pipe, a stirring device is arranged in the coagulation reaction tank, the part or the whole sewage in the anaerobic tank enters the coagulation reaction tank through the perforated water receiving pipe, a second sewage pipe is arranged at the lower part, and the upper part of the coagulating sedimentation tank is provided with a third sewage pipe connected with the aerobic tank.
2. The apparatus for efficient phosphorus removal in an AO process of claim 1, wherein: separate through vertical baffle between anaerobism pond and the good oxygen pond and establish, still water district baffle includes the vertical first baffle and the side shield that extend of top-down, the width of first baffle is less than the width in anaerobism pond, the well lower part in anaerobism pond is stretched to the lower extreme of first baffle, and is gapped between this first baffle and the vertical baffle, and one side of this first baffle is fixed on the lateral wall in anaerobism pond, links to each other through the side shield between opposite side and the vertical baffle, the curb plate in first baffle, side shield, vertical baffle and anaerobism pond encloses into still water district, cross the water hole setting on vertical baffle, and be located outside the still water district.
3. The apparatus for efficient phosphorus removal in an AO process according to claim 2, wherein: the lower part of first baffle forms the second swash plate to the direction slope that is close to vertical baffle, the water inlet below in stagnant water district is provided with first swash plate, and the one end of this first swash plate is fixed on vertical baffle, and the other end downward sloping extends to the below of the vertical section of first baffle, and is gapped between this second swash plate and the first swash plate, the water in anaerobism pond gets into stagnant water district through the clearance between first swash plate and the second swash plate.
4. An apparatus for efficient phosphorus removal in an AO process according to any one of claims 1 to 3, wherein: the coagulating sedimentation tank is internally provided with a vertically extending guide cylinder, the second sewage pipe is connected with a water inlet on the upper part of the guide cylinder, a bell mouth is arranged on a water outlet on the lower part of the guide cylinder, and a water outlet on the lower part of the guide cylinder extends to the upper part of a mud bucket at the bottom of the coagulating sedimentation tank.
5. The apparatus for efficient phosphorus removal in AO process of claim 4, characterized by: and a sludge discharge pipe is arranged on the bottom sludge hopper of the coagulating sedimentation tank.
6. The apparatus for efficient phosphorus removal in an AO process of claim 5, wherein: the upper portion of coagulating sedimentation jar is provided with the round weir of receiving, and this weir of receiving encloses into annular drainage district on coagulating sedimentation jar's upper portion, coagulating sedimentation jar's supernatant turns over and gets into annular drainage district behind the weir, third sewage pipe and annular drainage district UNICOM.
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