JPS60179190A - Dephosphorizing apparatus - Google Patents

Abstract

PURPOSE:To dephosphorize efficiently and stably over a long period of time by opening an original water inflow pipe to an agitation vessel, providing a treated water discharge means between the agitation vessel and a fluidization cylinder, and allowing a granular dephosphorizing material to be present at the inside of the vessel. CONSTITUTION:The original water contg. phosphates is allowed to flow into an agitation vessel 1 from an inflow pipe 7. An alkaline agent, etc. is injected from a chemical feeder 8 to regulate the pH of the liquid in the apparatus to 6-10, mixed, and agitated. A dephosphorizing material 11 having 0.1-0.2mm. size is added into the agitation vessel 1 and agitated to dephosphorize the original water to some extent. Then the water is circulated by a pump 5 to the bottom part of a fluidization cylinder 4 through a circulating pipeline 6. A fluidized bed of the dephosphorizing material 11 having 0.2-0.6mm. size is formed by the water sent from the bottom part. The original water is further dephosphorized by the contact with the fluidized dephosphorizing material 11, and flows out from an outflow port 9 through a treated water outflow pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for removing acid salts present in fibers.

[Prior art]

In recent years, with the progress of eutrophication in closed water bodies such as lakes, inland seas, and inner bays, various dephosphorization devices have been developed to remove phosphates from liquids discharged into these water bodies. .

Dephosphorization equipment includes a coagulation-sedimentation equipment that adds a flocculant to separate phosphates in the liquid as insoluble precipitates, and a coagulation-sedimentation equipment that separates phosphates from the p-liquid into biological forms by maintaining anaerobic and aerobic conditions. There are biological dephosphorization devices that fix sludge, but they all have the problem of discharging large amounts of sludge.

Therefore, a method for dephosphorizing without generating sludge by bringing phosphates in the liquid into contact with a dephosphorizing material such as granular phosphate minerals has been proposed, for example, in JP-A-53-1001.
A dephosphorization method such as that disclosed in Publication No. 63 has been developed and is attracting attention. In this method, dephosphorization is carried out by passing liquid in an upward or downward direction through a packed bed filled with dephosphorizing material. Some use layers.

(2) However, these methods all target liquids containing relatively low concentrations of phosphates, and it is difficult to apply them to liquids containing high concentrations due to the equipment.In other words, packed bed dephosphorization In equipment, the packed bed often becomes clogged, making it impossible to pass water for a long period of time (1), and fluidized bed removal equipment cannot identify the generated SS and does not have good phosphorus removal performance. Furthermore, because the dephosphorization material in these devices expands rapidly, it was necessary to draw out the dephosphorization profit and replenish the dephosphorization material as a new seed.

There are some that have dephosphorization present in the stirred tank, but
The dephosphorization performance is not sufficient, and there is a lot of sludge generated.

[Purpose of the invention]

It is an object of the present invention to solve these conventional problems and provide an apparatus that can efficiently and stably perform dephosphorization treatment over a long period of time, regardless of the phosphorus concentration in the liquid.

Another object of the present invention is to enable significant savings in installation space and processing costs.

[Structure of the invention]

The present invention provides a stirring tank having a stirring means at the upper part, and a fluidizing cylinder having a smaller cross-sectional area than the stirring tank at the lower part,
Connecting the lower part of the fluidizing cylinder and the stirring tank by circulation distribution,
A raw water inflow pipe is opened in the stirring tank, and a treated water outflow means is provided between the stirrer and the fluidization section, and a granular dephosphorizing material is contained inside. .

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a stirring tank 1 having a stirring means at the top is provided, but it is also possible to simply provide a mechanical stirrer 2 as the stirring means. , an inner cylinder 6 may be provided in the stirring tank 1 and the agitator 2 may be disposed within the inner cylinder 3, or an air jet pipe (not shown) may be installed in the lower part of the inner cylinder 6 instead of the agitator 2. It is also a preferable example to generate a circulating flow by an air lift effect.

At the bottom of the stirring tank 1, a fluidizing cylinder 4 having a cross-sectional area of and stirring 1 μm 1 are connected by a circulation pipe 6 having a pop 5 1-7, and 17 is arranged so as to lead the liquid in the stirring tank 1 to the fluidization cylinder 4F section.

Open the raw water inflow pipe 7 and chemical injection pipe 8 such as alkaline agent or calcium agent to the 1st stirrer 1. When the water is in the tank, the chemical pipe 8 may be directly connected to the middle of the raw water inflow pipe 7 to inject chemicals into the water.

Further, between the stirring tank 1 and the fluidization cylinder 4, there is a treated water outlet means, for example, a treated water outlet 9, a metal part 9, etc. In the apparatus configured in this way, various kinds of phosphate rock, bone coal, or abaite are further installed. A granular dephosphorizing material 11 such as a phosphate mineral such as a solid particle having 1-iiB or a particle supporting it or an ion exchange resin is present.

In the figure, reference numeral 12 indicates a tube from which the dephosphorizing material has been enlarged and expanded.

Next, to explain its effect, raw water containing phosphates is
Raw water flows into the stirring tank 1 from the inlet pipe 7, and an alkali agent or calcium agent is injected from the chemical injection pipe 8 for stirring and mixing. In this case, the alkaline agent is preferably injected so as to adjust the pH of the liquid in the device to around 6 to 10. In the stirring tank 1, a dephosphorizing material 11 with a thickness of around 0.01 to 0.2 mm is also stirred and mixed, thereby dephosphorizing the raw water to some extent.
Water is circulated to the lower part of the fluidization cylinder 4 through the . , fluidization 4
In this case, a fluidized bed of dephosphorizing material 11 is formed before and after the 02 to 06 throat by water feeding from the lower part, and the raw water is further dephosphorized by contact with this flowing dephosphorizing material 11, and then flows from the outflow section 9 to the treated water outflow pipe. It flows out after 10 minutes.

In this dephosphorization treatment, the dephosphorization material that has grown to a large size in the stirring tank 1 settles down into the fluidization cylinder 4 according to its sedimentation speed, where it once again participates in the phosphorus removal reaction. Furthermore, if the phosphates in the raw water are t4j, then 5Ca2-1+ 6PO'4+OH-→Ca5(OH)
SS is precipitated based on the reaction (POa)6, and this S
As mentioned above, S is sent to the fluidization cylinder 4 through the circulation pipe 6 and is fixed in contact with the dephosphorization 112. When stirring is performed, a portion of the SS is granulated, sediments, reaches the fluidization tube 4, and is reused as dephosphorization waste.

This method compensates for the deficiencies of conventional agitation and fluidized bed dephosphorization methods, copes with fluctuations in INF, water quality, and water phase, homogenizes reaction conditions, and achieves stable dephosphorization. carried out.

Next, an experimental example will be shown.

Phosphorus concentration 400-500m9/l, Ca”-1
0100O/l, 5S10m? /l, pn 2.
0 raw water was aerated to make the total carbonate concentration 1) j'loO immediately/adjusted to the following 1- pH was adjusted to 7.2 using slaked lime,
The results of processing 50 n17 days using various methods are as follows.
It was as shown in the table.

Method (a) f is according to the present invention, and the stirring tank 1 shown in FIG.
An inner cylinder 3 of 0 mnφ x 1000 am H was provided, and a stirrer 2 of 350 ran was installed inside, and Jordanian phosphate rock 11 f: 0.78 with an effective diameter of 01 mesh was added, and a fluidizing cylinder 4 was installed. 380++nnφX 200
0 vrml (the inside was filled with 1000 mm of similar phosphate rock with an effective diameter of 0.2 mm (7, the circulation amount by the circulation pipe 6 was 50y+?/day).

Method (b) is a comparative example, and as shown in the second figure, 750 mm
It is a fixed bed method in which 2000 am of similar phosphate rock 11 with an effective diameter of 0.4 nrm is filled in a column 13 with a diameter of 4000 wH and water is passed in a downward flow. A similar phosphate rock 11 with an effective diameter of 02 is placed in the tower 16' of
It was a fluidized bed system in which water was filled in an upward flow, and further circulated from the -J second part of the column 13' to the lower part at a rate of 50 R/day.

In addition, method (d) is also a comparative example, and uses only the stirring tank 1 at the upper part of the fluidizing section 4 of the method (ω (invention)) (-
1. Treated water is discharged from the top.

As is clear from these results, compared to other methods, the present invention can maintain the phosphorus concentration in treated water at a low level, significantly reduces sludge generation, and has a good recovery rate of granular apatite. Ta.

[Effects of the Invention] As described above, according to the present invention, dephosphorization can be performed efficiently and stably over a long period of time regardless of the phosphorus concentration in the liquid, and the amount of sludge generated can be greatly reduced. In addition, the recovery of phosphorus becomes easier, and the installation area and processing costs are also greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal view showing one embodiment of the present invention, and FIGS. 2 and 3 are explanatory longitudinal views showing comparative examples with the present invention used in experiments. 1. Stirring, 2 Stirrer, 6 Inner cylinder, 4. Fluidization cylinder, 5. Bonder, 6. Circulation piping, 7. Raw water inlet, 8.
- Chemical injection pipe, 9 - Outflow part, 10... Treated water outflow pipe,
11. Granular dephosphorization material, 13, 13'... tower. Patent applicant: Patent attorney representing Ebara Infilco Co., Ltd.
Masayuki Takagi

Claims (1)

[Claims] 1. A stirring tank having a stirring means is provided at the upper part, a fluidizing cylinder having a cross-sectional area smaller than the stirring tank is connected to the lower part, and circulation piping is connected between the upper part of the fluidizing cylinder and the stirring tank. The raw water inflow T4 is opened (JJ) into the stirring tank, and a treated water outlet means is provided between the stirring tank and the fluidization section, and a granular dephosphorizing material is present inside. 2. The dephosphorization device according to claim 1, wherein the stirring means comprises an inner cylinder and a stirrer provided inside the cylinder. 2. The dephosphorization device according to claim 1, comprising an air ejection pipe opened at the bottom.