JPS644468Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a catalytic dephosphorization device that removes phosphorus from water by bringing solid particles having phosphorus adsorption ability into contact with the device.

[Prior art]

An alkaline agent and
Alternatively, a catalytic dephosphorization device is known that removes phosphorus from water while passing water to be treated into which a calcium agent has been injected.

In addition, carbonic substances present in the water to be treated and calcium carbonate generated during the process of adding chemicals contaminate the dephosphorization material, so it is necessary to first decarbonate the water to be treated and then add alkaline agents and calcium carbonate. The process consists of a step of injecting the chemical, a sand filtration step to remove calcium carbonate contained in the chemicals, calcium carbonate generated by adding the chemicals, and organic matter contained in the water to be treated, and a dephosphorization step to remove phosphorus. A device has also been proposed, and if such a device is used, there will be no contamination of the dephosphorizing material, and treated water with stable quality for a long period of time can be obtained.

[Problem that the invention attempts to solve]

However, in the conventional apparatus consisting of each step, the steps are complicated and the amount of acid required for decarboxylation is enormous. Furthermore, when a device that does not include decarbonation or sand filtration steps is used, the dephosphorization material becomes contaminated and the quality of the treated water deteriorates, making it necessary to replace the entire amount of the dephosphorization material.

Furthermore, if the method of injecting acid is adopted as a method for regenerating contaminated dephosphorization material, not only will there be problems in processing the regenerated waste liquid, but it will also require a large amount of regenerating acid and a long regeneration time.

The present invention aims to solve the above problems and provide a catalytic dephosphorization device that efficiently regenerates dephosphorization material with a small amount of chemicals and simplifies the process.

[Means for solving problems]

In this invention, a tank equipped with an inflow pipe for treated water, an outflow pipe for treated water, and acid and alkali agent injection equipment is filled with solid particles having phosphorus adsorption ability, and at the same time, a water sprinkling device and a sprinkling system for treated water are installed at the bottom of the tank. This is a catalytic dephosphorization device that is equipped with an air system and further has a circulating water pipe connected between the bottom and top of the tank.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows an embodiment of a downward flow catalytic dephosphorization device, in which 1 is a tank body, a water inflow pipe 2 to be treated, and a water outflow pipe 3. , an acid injection tube 4 and an alkaline agent injection tube 5 are provided, and the acid injection tube 4 and alkali agent injection tube 5 can also be used for the same purpose. Inside the tank body 1, a packed layer of dephosphorization material 7 is formed on a supporting bed 6 such as gravel, and a water collector 8 connected to the treated water outflow pipe 3 is provided in or below the supporting bed 6 at the bottom.
and a diffuser 10 connected to the compressor 9 are provided.

It is preferable that the water collector and sprinkler 8 collects and sprinkles the treated water, and the treated water is returned from the treated water tank 11 connected to the treated water outflow pipe 3 via the return pump 12. Water collector 8
can also be used as the diffuser 10 by using appropriate piping.

Furthermore, the bottom and top of the tank 1 are connected by a circulation water pipe 14 with a circulation pump 13 interposed therebetween, so that water circulates within the tank 1.

In the illustrated example, the acid injection pipe 4 and the alkaline agent injection pipe 5 are opened into the circulating water pipe 14, but they can also be opened directly into the tank body 1.

In addition, the circulating water pipe 14 is provided with a flow type PH meter 15, and this PH meter 15 is connected to the injection pump 16 of the acid injection pipe 4 and the injection pump 1 of the alkaline agent injection pipe 5.
7 to enable automatic driving.

In the figure, 18 indicates a backwash drain pipe connected to the upper part of the tank body 1, and 19 indicates a waste water pipe connected to the lower part of the tank body 1.

Thus, the water to be treated is introduced into the tank body 1 from the water inflow pipe 2 after adding a calcium agent and/or an alkaline agent as necessary, and flows downward through a packed bed of dephosphorization material 7. The dephosphorized treated water flows through the water collector 8 and from the treated water outlet pipe 3 into the treated water tank 11 .

Perform the water flow for a predetermined period (for example, 1 to 3 days),
When the packed bed of the dephosphorization material 7 becomes clogged and the filtration resistance increases, the inflow of the water to be treated is stopped, the return pump 12 is activated, and the treated water is transferred from the treated water tank 11 to the water collector 8 and the tank body 1. Water is sprayed to the inner lower part and circulated upward to wash the dephosphorizing material 7, and the washing waste water is discharged to the outside from the backwash drain pipe 18. In order to strongly clean the dephosphorizing material 7, it is also possible to carry out so-called combined air cleaning by ventilating the inside of the tank from a compressor through an aeration diffuser 10.

The process continues while cleaning the dephosphorizing material 7 intermittently as described above, but over a long period of time (for example, about 5 to 6 months), the dephosphorizing material 7 is gradually removed.
The water becomes contaminated with calcium carbonate and organic matter, and the quality of the treated water also deteriorates. Therefore, after stopping the inflow of the water to be treated, the drain pipe 19 is opened and the water in the tank body 1 is drawn out. This water may be drawn out by leaving enough water so that the dephosphorizing material 7 is immersed in the water when aeration, which will be described later, is carried out, and by appropriately determining the opening height of the drain pipe 19.

After the water is removed from the tank 1, the water in the tank 1 is circulated through the circulating water pipe 14 by the circulating pump 13, and at the same time, acid is injected from the acid injection pipe 4 to efficiently lower the pH of the water in the tank 1. After that, the compressor 9 is started and air is blown in from the aeration device 10 to agitate the dephosphorization material 7. This operation effectively removes calcium carbonate and organic matter on the dephosphorization material 7. Next, the injection of acid and the compressor 9 are started.
The process is stopped, alkali is injected through the alkaline agent injection pipe 5, and the pH of the water in the tank 1 is increased to 7-8 while circulating the water in the tank 1 through the circulating water pipe 14.

After the injection of the alkaline agent and the compressor 9 are stopped, the system is left for a certain period of time, and the water to be treated is passed through again to restart the dephosphorization process.

In addition, if a flow-type PH meter 15 is provided in the circulating water pipe 14 and this PH meter 15 is linked to the acid and alkali agent injection pumps 16 and 17, the circulating water pipe 14
Each injection pump 1 according to the PH value of the water flowing through it.
6,17 movements can be automated.

The second illustrated example shows an upward flow type embodiment, in which the treated water inflow pipe 2 is located at the lower part of the tank body 1, and the treated water outflow pipe 3 is located at the bottom of the tank body 1.
is provided on the upper part of the tank body 1, and the rest is almost the same as the first illustrated example. Therefore, the water to be treated to which the alkaline agent and/or calcium agent has been added is passed through the lower part of the tank body 1 and flows upward through the packed bed of the dephosphorizing material 7, except that it is similar to the first illustrated example. The effect is similar.

In the second illustrated example, phosphorus in the liquid to be treated is removed by circulating and mixing a part of the treated water from the water collector 8 with the water to be treated using the return pump 12 during the dephosphorization process by water flow. The concentration can be lowered and the dephosphorization efficiency can be increased. Water collector 8 in this example
may have only a water sprinkling function and no water collection function. Also, as in the first illustrated example, the injection of acid and alkali agents can be linked with the PH meter 15.

The third illustrated example shows an embodiment of a fluidized bed type, with a treated water inlet pipe 2 at the bottom of the tank body 1 and a treated water outlet pipe 3 at the top of the tank body 1. The treated water to which calcium and/or alkaline agents have been added is introduced into the bottom of the tank body 1, and at the same time, a part of the treated water is caused to flow into the bottom of the tank body 1 by a return pump 12 to mix with the water, thereby improving the efficiency of dephosphorization. To improve this mixing, it is advisable to provide a conical structure 20 at the bottom of the tank body 1.

Therefore, the water to be treated flows upward in the tank body 1, and a part of the treated water is mixed by the return pump 12, and the dephosphorization treatment is performed while fluidizing the dephosphorization material 7, but the treatment continues. If this is done, the dephosphorization material 7 will gradually become contaminated with calcium carbonate and organic matter over a long period of time. After stopping the inflow and return pump 12 of the water to be treated, the wastewater pipe 19
, and draw out an appropriate amount of water from the tank body 1. Next, the circulation pump 13 is started, the water in the tank body 1 is circulated through the circulation water pipe 14, and at the same time, acid is injected from the acid injection pipe 4 to lower the pH of the water, and then the compressor 9 is started, Air is blown in from the diffuser 10.

After that, the alkaline agent is injected, which is the same as in the embodiments shown in FIGS. be.

Note that the acid injected from the acid injection tube 4 is as follows:
Hydrochloric acid, sulfuric acid, organic acids, etc. can be used,
If organic contamination is severe, it is recommended to use an organic acid. The alkaline agents injected from the alkaline agent injection pipe 5 include slaked lime, magnesium hydroxide,
Caustic soda is used. In order to improve the mixing of these chemicals, it is also a preferable example to provide a line mixer near the injection point of the circulating water pipe 14.

As the dephosphorizing material 7, phosphate rock, bone charcoal, Kanuma soil, converter slag, and light burnt magnesia can be used.

In addition, the inner wall of the tank body 1, the water collector 8, the air diffuser 10
It is also necessary to use an acid-resistant material or resin for the parts of the tank body 1 that come into contact with water.

[Effect of idea]

As described above, the present invention eliminates the need for pretreatment processes such as decarboxylation and sand filtration, simplifies the process and equipment, and enables the regeneration of dephosphorizing material to be carried out in a short period of time by using aeration and water circulation. Since it can be carried out efficiently and in a short amount of time, it has the extremely useful effect of reducing the amount of chemicals such as acids used.

[Brief explanation of the drawing]

1 to 3 are longitudinal sectional views showing embodiments of the present invention, respectively. 1... Tank body, 2... Treated water inflow pipe, 3... Treated water outflow pipe, 4... Acid injection pipe, 5... Alkaline agent injection pipe, 6... Support bed, 7... Dephosphorization material, 8...
Water collector, 9...Compressor, 10...Aeration diffuser, 11...Treatment water tank, 12...Return pump, 1
3...Circulation pump, 14...Circulation water pipe, 15...
PH meter, 16, 17... Injection pump, 18... Backwash drain pipe, 19... Waste water pipe, 20... Structure.

Claims (1)

[Claims for Utility Model Registration] 1. A tank equipped with a treated water inflow pipe, a treated water outflow pipe, and acid and alkali agent injection equipment is filled with solid particles having phosphorus adsorption ability, and the treated water is poured into the bottom of the tank. equipped with water sprinklers and air diffusers,
The catalytic dephosphorization device is further characterized in that a circulating water pipe is connected between the bottom and top of the tank. 2 The treated water inflow pipe is connected to the upper part of the tank, the treated water outflow pipe is connected to the treated water sprinkling device, and the sprinkling device also has a water collection function, Claim 1 Catalytic dephosphorization equipment as described. 3. The catalytic dephosphorization apparatus according to claim 1 or 2, wherein the acid and alkaline agent injection equipment is opened in the circulating water pipe. 4. The catalytic dephosphorization apparatus according to claims 1 to 3, wherein the circulating water pipe has a PH meter linked to the acid or alkali injection equipment.