CN108178272B - Wastewater dephosphorization device and method for treating phosphorus-containing wastewater by using same - Google Patents

Wastewater dephosphorization device and method for treating phosphorus-containing wastewater by using same Download PDF

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Publication number
CN108178272B
CN108178272B CN201810005692.7A CN201810005692A CN108178272B CN 108178272 B CN108178272 B CN 108178272B CN 201810005692 A CN201810005692 A CN 201810005692A CN 108178272 B CN108178272 B CN 108178272B
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screw
shell
wastewater
phosphorus
wall
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CN108178272A (en
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冯华军
梁禹翔
余晓琴
邓永斌
周志阳
黄鹏
张华杰
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Zhejiang Leo Environmental Protection Technology Co ltd
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Zhejiang Leo Environmental Protection Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses a wastewater dephosphorization device and a method for treating phosphorus-containing wastewater by using the same, wherein the dephosphorization device comprises a cylindrical shell and a screw device arranged in the shell, the screw device comprises a central shaft which is vertically arranged and a screw blade which is continuously wound on the central shaft, and the outer edge of the screw blade is in contact fit with the inner wall of the shell; the wall of the shell above the top layer of the spiral sheets is provided with a medicament feeding port and a water outlet, the medicament feeding port is positioned above the water outlet, the wall of the shell between the two layers of the spiral sheets at the bottom is provided with a sewage inlet, and the bottom of the shell is provided with a sludge outlet. The method can effectively improve the contact area and the contact time of the wastewater and the phosphorus removal reagent, and skillfully realizes the regulation and control of the concentration of phosphate radicals and the concentration of the precipitator by the self-precipitation principle of the precipitation reagent, so that the precipitation reaction is carried out forward, thereby improving the utilization rate of the phosphorus removal reagent.

Description

Wastewater dephosphorization device and method for treating phosphorus-containing wastewater by using same
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a spiral phosphorus removal device and a method for treating phosphorus-containing wastewater by using the same.
Background
The research shows that when the total phosphorus content in the water exceeds 0.2 mg/L, the algae can be promoted to be excessively propagated, the balance of the original water body is damaged, and eutrophication pollution is caused.
Based on this, the chemical precipitation method is an effective method for treating the phosphorus-containing wastewater at present. The chemical precipitation agent mainly comprises aluminum ions, iron ions and calcium ions, wherein the balance constant of hydroxyapatite generated by lime and phosphate radicals is the largest, and the phosphorus removal effect is the best.
Main reaction: 5Ca2++7OH-+3H2PO4 -＝Ca5(OH)(PO4)3↓+6H2O
Side reaction: ca2++OH-＝Ca(OH)2↓
In addition, a great deal of literature and patents report various mixed chemical precipitating agents which can effectively improve the precipitation efficiency of inorganic phosphorus, for example, patent 201611200586.1 discloses a composite phosphorus removing agent combining inorganic and organic matters, which has the advantages of low investment cost, low operation cost, small sludge amount and the like, the phosphorus concentration of effluent treated by the agent can reach 0.5 mg/L, patent 201210211006.4 discloses a composite phosphorus removing and decolorizing agent and a phosphorus and decolorizing method thereof, wherein the composite agent comprises ferrous sulfate, calcium hypochlorite, borax and the like, and the phosphorus removing rate of wastewater reaches 70-95% by mixing and standing.
The above reagents can effectively precipitate inorganic phosphorus in wastewater, but the utilization rate of the reagents is very low, often less than 1%. The contact area of the precipitant and the sewage is small, and the contact time period causes one of the main reasons of low utilization. In addition, the removal rate of phosphate radical mainly depends on the equilibrium constant and ion concentration of the reaction formula, and according to the main reaction, because the phosphorus concentration in domestic sewage is low, if the reaction needs to be carried out in the forward direction, the concentration of the precipitate needs to be reduced and the cation concentration needs to be increased, the precipitate is difficult to be taken out, and only the cation concentration is continuously increased, the effective removal of phosphorus can be realized, so that a large amount of phosphorus removing agent is wasted effectively.
Disclosure of Invention
Based on the defects in the prior art, the invention provides the wastewater dephosphorization device, which can effectively improve the contact area and the contact time between wastewater and a dephosphorization reagent, and skillfully realizes the regulation and control of the concentration of phosphate radicals and a precipitator by the precipitation reagent self-precipitation principle, so that the precipitation reaction is carried out forward, thereby improving the utilization rate of the dephosphorization reagent.
A wastewater dephosphorization device comprises a cylindrical shell and a screw device arranged in the shell, wherein the screw device comprises a vertically arranged central shaft and a screw plate continuously wound on the central shaft, a gap is reserved between the outer edge of the screw plate and the inner wall of the shell, and the gap is smaller than 1 mm; the wall of the shell above the top layer of the spiral sheets is provided with a medicament feeding port and a water outlet, the medicament feeding port is positioned above the water outlet, the wall of the shell between the two layers of the spiral sheets at the bottom is provided with a sewage inlet, and the bottom of the shell is provided with a sludge outlet.
The invention has the following action principle:
1) the upper part of the reactor is added with a phosphorus removal reagent, and the precipitate gradually sinks along the screw under the action of the screw. Based on this, the concentration of cations in the upper reaction solution is high and the concentration of precipitates is low, which is very beneficial to forward proceeding of the precipitation reaction, so that the method is suitable for treating wastewater with low total phosphorus concentration, namely wastewater in the later reaction period.
2) The lower part of the reactor contains a large amount of precipitate, but the precipitate only treats a very small amount of phosphorus at the upper part, mainly because the cation precipitates spontaneously under the action of hydroxyl, and when the precipitate meets high-concentration phosphorus, the precipitate reacts with the phosphorus again to generate precipitate, and the process is just suitable for treating the high-concentration phosphorus in the bottom feed water.
Preferably, the height h of the shell is 1-2 m, and the diameter of the shell is 3/10-3/5 of the height h.
The height of the shell of the reactor is preferably 1-2 meters, because the phosphorus removal device is mainly applied to a distributed rural domestic sewage treatment system, the water quantity is small, the height of the reactor is not required to be higher than 2 meters, when the height of the reactor is lower than 1 meter, the height of the reactor is insufficient, the effective separation of sediment and wastewater cannot be realized, in addition, the contact time of a phosphorus removal agent and the wastewater is also reduced, the phosphorus removal effect is incomplete, and the utilization rate of the phosphorus removal agent cannot be improved.
Preferably, the height of the water outlet is 1-5cm lower than the medicament adding port.
Preferably, the gap between the outer edge of the spiral sheet and the inner wall of the shell needs to be less than 1 mm.
The gap between reactor cylinder formula shell and the spiral ware needs to be less than 1mm, when the interval was too big, can lead to the precipitant directly to fall to the bottom from the gap, can't reach precipitate reutilization's effect, but when no gap between shell and helical blade, then can lead to the blade corner to produce the reaction dead zone.
Preferably, the outer side of the helical blade is inclined downwards, and the inclination angle is 5-20 degrees. The inclination angle here means an angle between the inclined surface of the helical blade and the horizontal plane.
The outer side of the blade of the screw propeller needs to be inclined downwards, and the inclination angle A is 5-20 degrees. This requires the outer sides of the blades of the screw to be inclined downwards, since the screw will cause the sediment to suspend hydrodynamically during rotation, in order to ensure that the sediment stays in each layer for a sufficient amount of time, rather than falling vertically directly from the centre of the reactor.
When the inclination angle is lower than 5 degrees, a large amount of sediments can directly fall from the middle part of the helical blade, so that the contact time of the sediments and the wastewater is insufficient; however, when the inclination angle is less than 20 °, a large amount of the precipitate is deposited on the periphery of the reactor, and the contact area of the precipitate with the waste water is also insufficient.
Preferably, the distance between adjacent helical blades is 5-20 cm. Too large a blade pitch will result in too many ineffective reaction zones; the blade interval is too short, which is easy to cause sediment blockage.
The invention provides a method for treating phosphorus-containing wastewater, which utilizes a phosphorus removal device for the wastewater to comprise the following steps:
(1) pressing phosphorus-containing wastewater from a bottom sewage inlet through a water pump, and gradually moving upwards along the direction of a screw;
(2) slowly adding a phosphorus removal reagent from a reagent adding port at the top of the reactor;
(3) and pumping sludge at the bottom of the device through sludge effluent every 5-10 days.
As preferred, dextrorotation screw spiral direction is anticlockwise, and levogyration screw spiral direction is clockwise, and this spiral process except can making the inside deposit of reactor fully contact with waste water, also can guarantee to get into the screw immediately after reactor top deposit is produced, avoids new deposit to produce the influence to going out water, has also saved the secondary and has depositd the step.
Preferably, the screw speed in the screw is 1-10 rmp.
The screw speed of the propeller is 1-10rmp, and the bottom water inlet can generate power for the water body, so that the propeller can be stopped from rotating when the water inlet amount is large, the propeller can be properly started when the water inlet amount is low, but the rotating speed needs to be lower than 10rmp, and the excessive rotating speed can cause the sediment in the reactor to be mixed with the water body in a transition manner, so that the water outlet clarity is influenced.
Preferably, the residence time of the waste water is between 0.5 and 2 hours.
The method has better treatment effect on the wastewater containing low-concentration phosphorus (<20 mg/L), and a large amount of sediment can be generated when the concentration is too high, so that the propeller is blocked.
Compared with the prior art, the invention has the following beneficial effects:
(1) the device can effectively improve the utilization of the phosphorus removing agent, thereby reducing the phosphorus removing cost;
(2) the invention does not need any manual maintenance, has simple operation and extremely low energy consumption;
(3) the invention has small floor area and does not need a secondary sedimentation tank.
Drawings
FIG. 1 is a schematic view of a phosphorus removal device of the present invention.
FIG. 2 is a cross-sectional view of the phosphorus removal device of the present invention.
The reference numerals shown in the figures are as follows:
1 spiral device 2 water outlet 3 shell
4 medicament adding port 5, water inlet 6 and sludge outlet
11 center shaft 12 helical blade
Detailed Description
As shown in figures 1 and 2, the wastewater dephosphorization device comprises a cylindrical shell 3 and a screw 1 arranged in the shell, wherein the screw 1 comprises a central shaft 11 vertically arranged at the center in the shell and a helical blade 12 continuously wound on the central shaft, a gap between the outer edge of the helical blade and the inner wall of the shell is smaller than 1mm, and the outer side of the helical blade is obliquely arranged and forms an included angle of 5-20 degrees with the horizontal plane.
A medicament adding port 4 and a water outlet 2 are formed in the shell and above the top layer of spiral blades, the water outlet is 1-5cm lower than the medicament adding port, a sewage inlet 5 is formed in the shell between the two layers of spiral blades at the bottom, and the distance H between every two adjacent layers of spiral blades is 5-20 cm; the bottommost position of the center of the bottom of the shell is provided with a sludge outlet 6. The height h of the shell is 1-2 m, and the diameter is 3/10-3/5 of the height h.
The working mode of the invention is as follows:
(1) pressing phosphorus-containing wastewater from a bottom sewage inlet through a water pump, and gradually moving upwards along the direction of a screw;
(2) slowly adding a phosphorus removal reagent from a reagent adding port at the top of the reactor;
(3) and pumping sludge at the bottom of the device through sludge effluent every 5-10 days.
Example 1
Aiming at one flow of 30m3The total phosphorus concentration of inlet water of the rural domestic sewage/d is 7.7 mg/L, the pH value of the inlet water is 6.3, the height of the used phosphorus removal device is 1.4 m, the diameter is 0.7m, and the selected phosphorus removal reagent is a finished phosphorus removal agent (Kaxiong brand, made of Fe and sold directly in the market)3+、OH-、SO4 2-、Mg2+And Cl-Plasma composition).
In the traditional stirring tank and sedimentation tank reactor, when the phosphorus removal dosage of each ton of wastewater is 50g, the total phosphorus concentration of the effluent reaches 1.3 mg/L, and when the reagent is used in the phosphorus removal device, only 12g of the reagent needs to be added to each ton of wastewater, and the total phosphorus concentration of the effluent of the wastewater reaches 1.2 mg/L.
Example 2
The sewage system and the using device are the same as the embodiment 1; the selected phosphorus removal reagent is finished phosphorus removal liquid directly sold in the market (the brand is environment-friendly, and the components are unknown).
In the traditional stirring tank and sedimentation tank reactor, the dosage is 0.3 kg/cubic water, the total phosphorus concentration of the effluent reaches 0.7 mg/L, and when the reagent is used in the phosphorus removal device, only 0.09kg of the reagent needs to be added to each ton of wastewater, and the total phosphorus concentration of the effluent of the wastewater reaches 0.7 mg/L.
Example 3
Aiming at a flow of 75m3The total phosphorus concentration of inlet water of the rural domestic sewage/d is 4.5 mg/L, the pH value of the inlet water is 6.1, the height of the used phosphorus removal device is 1.8 m, the diameter of the phosphorus removal device is 1m, and the selected phosphorus removal reagent is a finished phosphorus removal agent sold directly on the market (Beibei protects the environment in the brand and has unknown components).
In the traditional stirring tank and sedimentation tank reactor, the dosage is 0.2 kg/cubic water, the total phosphorus concentration of the effluent reaches 1.0 mg/L, and when the reagent is used in the phosphorus removal device, only 0.07kg of the reagent needs to be added to each ton of wastewater, and the total phosphorus concentration of the effluent of the wastewater reaches 0.9 mg/L.
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any person skilled in the relevant art can change or modify the present invention within the scope of the present invention.

Claims (8)

1. A method for treating phosphorus-containing wastewater is characterized in that a wastewater phosphorus removal device is utilized, and the method comprises the following steps:
(1) pressing phosphorus-containing wastewater from a bottom sewage inlet through a water pump, and gradually moving upwards along the direction of a screw;
(2) slowly adding a phosphorus removal reagent from a reagent adding port at the top of the reactor;
(3) pumping sludge at the bottom of the device through a sludge outlet every 5-10 days;
the wastewater dephosphorization device comprises a cylindrical shell and a screw device arranged in the shell, wherein the screw device comprises a vertically arranged central shaft and a screw plate continuously wound on the central shaft, a gap is reserved between the outer edge of the screw plate and the inner wall of the shell, and the gap is smaller than 1 mm; the wall of the shell above the top layer of the spiral sheets is provided with a medicament feeding port and a water outlet, the medicament feeding port is positioned above the water outlet, the wall of the shell between the two layers of the spiral sheets at the bottom is provided with a sewage inlet, and the bottom of the shell is provided with a sludge outlet.
2. The process of claim 1, wherein the shell has a height h of 1 to 2m and a diameter of 3/10 to 3/5.
3. The treatment method according to claim 1, wherein the height of the water outlet is 1-5cm lower than the medicament feeding port.
4. The treatment method according to claim 1, wherein the outer side of the spiral sheet is inclined downward at an angle of 5 to 20 °.
5. The process of claim 1 wherein the pitch between adjacent flights is 5 to 20 cm.
6. The treatment method according to claim 1, wherein the screw is rotated counterclockwise when the right-handed screw is used as the screw, and is rotated clockwise when the left-handed screw is used as the screw.
7. The process of claim 1, wherein the screw speed of the screw is 1 to 10 rmp.
8. The process of claim 1, wherein the residence time of the waste water is 0.5 to 2 hours.
CN201810005692.7A 2018-01-03 2018-01-03 Wastewater dephosphorization device and method for treating phosphorus-containing wastewater by using same Active CN108178272B (en)

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CN108178272B true CN108178272B (en) 2020-08-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000288556A (en) * 1999-04-07 2000-10-17 Isao Somiya Wastewater treatment apparatus
CN104478121A (en) * 2014-11-13 2015-04-01 东华大学 Helical flow dephosphorization reactor
CN106669550A (en) * 2016-11-30 2017-05-17 江苏永冠给排水设备有限公司 High-speed reaction kettle equipment for fluorine water removal treatment based on planting method and use method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000288556A (en) * 1999-04-07 2000-10-17 Isao Somiya Wastewater treatment apparatus
CN104478121A (en) * 2014-11-13 2015-04-01 东华大学 Helical flow dephosphorization reactor
CN106669550A (en) * 2016-11-30 2017-05-17 江苏永冠给排水设备有限公司 High-speed reaction kettle equipment for fluorine water removal treatment based on planting method and use method thereof

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