JPH07204685A - Tertiary treatment apparatus for drainage - Google Patents

Abstract

PURPOSE:To conduct denitrification and dephosphorization of drainage at high yields without remodeling an existing purification apparatus. CONSTITUTION:An impeller 4 is installed on the water surface in the denitrification vessel 1 of an apparatus main body A, and the impeller 4 is rotated by treated water discharged from a purification apparatus B. A lot of magnet grains 5 are fixed on the surface of the impeller 4; denitrification bacteria activated by the magnetic force of the magnet grains are exposed alternately to the hydrosphere and the atmosphere so that the colonies of the bacteria grow in a favorable environment to obtain efficient denitrification function. The iron components in water to be treated which is sent from a denitrification vessel 2 to a dephosphorization vessel 3 are attracted by the magnet grains fixed on the surface of a cylindrical filter medium 7 set in the dephosphorization vessel 3; phosphorus, which is apt to adhere to the iron components, is positively removed by being attracted by the magnet grains with the iron components.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a primary treatment in a purifying device,
The present invention relates to a waste water tertiary treatment device that obtains a high nutrient salt (nitrogen and phosphorus) removal rate by subjecting the treated water that has been subjected to the secondary treatment to a third treatment.

[0002]

2. Description of the Related Art Generally, most of organic pollutants contained in waste water are removed by sedimentation (primary treatment) and biological treatment (secondary treatment) in a purification device. In addition, most of the organic nitrogen is nitrified and further denitrified by repeating anaerobic treatment and aerobic treatment, and phosphorus is also extracted together with excess sludge, and the clarified treated water is placed in public water areas. Is released.

[0003]

By the way, the critical concentration of eutrophication by nutrient salts (nitrogen and phosphorus) contained in wastewater is extremely low, and it is released in closed water areas such as lakes, inner bays and inland seas. Inducing overgrowth of plankton due to the effect of trace amounts of nutrients contained in the secondary treated water
Various adverse effects that lead to deterioration of water quality can occur.

Therefore, in order to prevent these adverse effects, it is desirable to completely remove the nutrient salts from the wastewater and then release them into the public water area, but in order to completely remove them by the primary treatment and the secondary treatment. Must be equipped with a large-scale septic tank, resulting in high costs and poor feasibility.

Further, repair work is required to cope with the existing septic tank, and the treatment and purification during that period will be hindered, so that it cannot be promptly dealt with.

The present invention has been made in view of the above circumstances, and it is possible to realize a high nutrient salt removal rate at a low cost by using an existing septic tank, and a simple and easy-to-handle wastewater tertiary treatment device. Is intended to provide.

[0007]

In order to achieve the above object, the present invention provides a waste water tertiary treatment apparatus for denitrifying and dephosphorizing treated water, which is connected to a downstream of a purifying apparatus.
A denitrification tank and a dephosphorization tank, which communicate with each other through a baffle, are provided, the lower surface of the denitrification tank is immersed in treated water, and the surface of the denitrification tank is rotated while receiving the water flow of the treated water discharged from the water discharge pipe. An impeller for mounting the magnetically permeable member is provided on the other hand, and a tubular filter medium for mounting the magnetically permeable member on the surface is exchangeably immersed in the dephosphorization tank. Is communicated via an advection tube.

[0008]

[Operation] In the present invention, when the treated water discharged from the purification device flows into the denitrification tank, the impeller rotates by the water flow of the treated water. A magnetic susceptibility member is attached to the surface of this impeller, and the denitrifying bacteria that generate bacterial flora on the surface are activated by the magnetic force of the above magnetic susceptibility member. Since the atmosphere and the atmosphere are alternately switched, the treated water in the denitrification tank is denitrified under the optimum environment.

Next, when this treated water flows from the denitrification tank through the baffle into the adjacent dephosphorization tank, the inflowed treated water flows through the cylindrical filter media immersed in the dephosphorization tank. It flows out to the next processing tank through the pipe.

Iron is adsorbed to the cylindrical filter medium by the magnetic force of the magnetically permeable member provided on the surface thereof, and phosphorus adhering to the iron is adsorbed at the same time. As a result, most of the phosphorus is actively removed from the treated water during passage through the tubular filter media. By exchanging the tubular filter medium, the phosphorus adsorbed on the surface of the tubular filter medium can be extracted together with other excess sludge.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

Apparatus main body A of the waste water tertiary treatment apparatus shown in FIG.
A denitrification tank 1 and a dephosphorization tank 2 are formed adjacent to each other from the upstream side, and both tanks 1 and 2 are connected via a baffle 3.

On the water surface of the denitrification tank 1, a plurality of impellers 4 are rotatably provided along the water flow.
The lower part of is immersed in treated water. As shown in FIG. 2, on the surface of the impeller 4, a large number of magnet particles 5 as an example of a magnetically permeable member are attached. Further, at a position where it is desired to be biased to one side above the impeller 4, an inflow pipe 6 communicating with a water discharge pipe B1 of a purifying device B for performing primary treatment and secondary treatment of wastewater.
Is facing.

On the other hand, the dephosphorization bath 2 is divided into a plurality of treatment baths 2a and a final treatment bath 2b from the upstream side to the downstream side along the flow of the treated water, and the treatment baths 2a are exchangeable. The tubular filter material 7 is erected. As shown in FIG. 3, a large number of magnet particles 5, which are an example of a magnetically permeable member, are attached to the surface of the tubular filter material 7. Further, the inside of the cylindrical filter medium 7 is filled with an internal filter medium such as pumice weathered particles typified by so-called Kanuma soil.

An inflow port 7a is formed in a side surface of the lower portion of the cylindrical filter medium 7 which faces the upstream direction, and the treated water flows into the inflow port 7a and rises. Further, an advection pipe 8 communicating with the inside of the tubular filter medium 7 is connected to the side surface of the upper portion of the tubular filter medium 7 which is directed in the downstream direction, and the discharge port of the advection pipe 8 is connected to the adjacent processing tank 2a. It is open. Further, an advection pipe 8 communicating with a cylindrical filter medium 7 standing upright in the treatment tank 2a located at the most downstream side is opened in the final treatment tank 2b, and a discharge pipe 9 is opened in the water surface of the final treatment tank 2b. .

Next, the operation of the embodiment having the above structure will be described.

When the treated water, which has been subjected to a predetermined primary treatment and a secondary treatment in the purifying device B, is discharged from the inflow pipe 6 of the main body A of the device to the impeller 4 laterally provided on the water surface of the denitrification tank 1, this impeller 4 rotates, the denitrifying bacteria that generate a flora on the surface of the impeller 4 alternate between the hydrosphere and the atmosphere to create a good denitrifying environment, and the denitrifying bacteria are attached to the surface of the impeller 4. The denitrification tank 1 is activated by receiving the magnetic force of the magnet particles 5.
Denitrify the treated water that has flowed into the system under a favorable environment.

The treated water that has flowed from the denitrification tank 1 through the baffle 3 into the treatment tank 2a of the adjacent dephosphorization tank 2 slowly descends, and the cylindrical filter medium 7 standing upright in this treatment tank 2 is provided. From the inflow port 7a formed in the lower side surface of the cylindrical filter medium 7, it flows into the inside of the cylindrical filter medium 7 and rises inside thereof. in the meantime,
Iron is adsorbed by the large number of magnet particles 5 mounted on the surface of the tubular filter material 7 and, at the same time, phosphorus adhering to the iron is adsorbed. Further, phosphorus and other contaminants are efficiently removed by the internal filter medium such as weathered pumice particles filled in the tubular filter medium 7.

As a result, most of the nitrogen and phosphorus in the treated water are removed while flowing through the treatment tanks 1 and 2a,
In the final treatment tank 2b, clear treated water (tertiary treated water) having an extremely high iron and nutrient salt removal rate can be obtained.

The tubular filter medium 7 is a replaceable cartridge type, and the phosphorus adsorbed on the tubular filter medium 7 together with the excess sludge can be easily extracted by replacing the tubular filter medium 7 itself. You can

Furthermore, since this waste water tertiary treatment device does not require external power, it is economical, and it can be dealt with by a simple extension work without modifying the existing purification device 5, so that a quick response is possible. It is possible and easy to handle.

[0022]

As described above, according to the present invention,
Only by installing it downstream of the purification device, it is possible to obtain clear tertiary treated water with extremely high nutrient salt removal rate.

Moreover, since it is non-powered, it is economical and maintenance is easy, and it can be easily added to an existing purification device at low cost.

Furthermore, since the tubular filter medium is a replaceable cartridge type, phosphorus can be easily extracted together with other excess sludge by exchanging the tubular filter medium.
Good handleability.

[Brief description of drawings]

FIG. 1 Schematic cross-sectional view of a wastewater tertiary treatment device

FIG. 2 is a perspective view of an impeller.

FIG. 3 is a perspective view of a tubular filter medium.

[Explanation of symbols]

 1 denitrification tank 2 dephosphorization tank 3 baffle 4 impeller 5 magnetic member 7 tubular filter material 8 advection tube A device body B purification device

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Claims (1)

[Claims] 1. A waste water tertiary treatment device for denitrifying and dephosphorizing treated water communicating with a downstream of a purification device, wherein a denitrification tank and a dephosphorization tank communicating with each other via a baffle are provided in the main body of the device. On the water surface of the denitrification tank, there is provided an impeller whose lower part is immersed in treated water and which is rotated by receiving the water flow of the treated water discharged from the water discharge pipe and which is equipped with a magnetically permeable member on the surface thereof. A drainage tertiary treatment device characterized in that a tubular filter medium having a magnetically permeable member mounted on the surface is replaceably immersed, and the inside of the tubular filter medium is communicated with the next treatment tank through an advection pipe. .