JPH0929242A - Apparatus for waste water tertiary treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high phosphorus removing rate without modifying an existing purification apparatus. SOLUTION: In an apparatus main body A, a denitrification tank 1 is provided and a dephosphorization tank 2 is provided on the downstream thereof and a plurality of treating tanks 2a are provided in this dephosphorization tank 2. In addition, freely exchangeable cylindrical filter frames 7 are filled in each of these treating tanks 2a. A number of magnetic particles are fixed on the peripheral face of this cylindrical filter frame 7 and a filter medium 7b formed by calcining or drying weathere pumice particles such as Kanuma soil is filled in the inside. Waste water treated with primary and secondary treatments in a purification apparatus B is specifically denitrified in the denitrification tank 1 and it flows into the dephosphorization tank 2, wherein dephosphorization is performed by magnetic particles of the cylindrical filter frame 7 mounted in each treating tank 2a and the built-in filter medium 7b and reaches a final treating tank 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater tertiary treatment device for enhancing the removal rate of nutrients by subjecting the wastewater subjected to the primary treatment and the secondary treatment by a purifying device to a further tertiary 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 clarified wastewater is released to public water areas. To be done.

[0003]

By the way, the critical concentration of eutrophication by nutrient salts (phosphorus, etc.) contained in wastewater is extremely low, and it is released in closed water areas such as lakes, inner bays, and inland seas. Various adverse effects that lead to deterioration of water quality, such as overproliferation of plankton due to the influence of a small amount of nutrient salts contained in the secondary treated water, may 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 at the same time, the waste water tertiary treatment is simple and easy to handle. The purpose is to provide a device.

[0007]

In order to achieve the above object, the present invention relates to a drainage tertiary treatment device for communicating the downstream of a purifying device with a tertiary treatment of wastewater, wherein a plurality of dephosphorization tanks are provided in a main body of the device. A cylinder in which a treatment tank is provided and a final treatment tank is provided at the most downstream side, a magnetically permeable member is mounted on the surface of each of the above treatment tanks, and a filter medium formed by firing or drying pumice weathered grains is loaded inside. The cylindrical filter frames are arranged so that they can be exchanged, the drainage inlet is opened in the lower part of each cylindrical filter frame, and the advection pipe for discharging the drainage is provided in the upper part. It is characterized by being opened in the processing tank. Further, it is preferable that the bottom portion of the cylindrical filter frame and the bottom portion of the processing tank are formed with positioning portions that can be engaged with each other.

According to the present invention, when the wastewater discharged from the purification device flows into one processing tank provided in the dephosphorization tank, an inlet opening at the bottom of the cylindrical filter frame mounted in this processing tank. From the inside to the inside and then flows out to the adjacent processing tank through the advection pipe provided in the upper part. A magnetism member is attached to the surface of the cylindrical filter frame, the iron component in the waste water is adsorbed by the magnetic force of the magnetism member, and the phosphorus component is attached via the iron component. Further, when the waste water passes through the inside of the cylindrical filter frame, the phosphorus content in the waste water is adsorbed by the filter material formed by burning or drying the pumice weathered particles loaded in the inside. As a result, when the wastewater discharged from the purification device passes through the plurality of treatment tanks, most of the phosphorus content contained in the wastewater is removed and reaches the final treatment tank and is discharged. It should be noted that, preferably, when the tubular frame is replaced with a new tubular frame, by forming a positioning portion that is engageable with each other in the bottom portion of the tubular filter frame and the bottom portion of the processing tank, The positioning portion serves as a guide and can be always installed in the correct position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1 and FIG. 2, a denitrification tank 1 and a dephosphorization tank 2 are formed adjacent to each other from the upstream side in the apparatus main body A of the wastewater tertiary treatment apparatus, and these tanks 1 and 2 are connected via a baffle 3. It is in communication.

On the water surface of the denitrification tank 1, a plurality of impellers 4 are horizontally installed so as to be rotatable along the water flow.
The lower part of is immersed in the drainage. As shown in FIG.
On the surface of the impeller 4, a large number of magnet particles 5 as an example of a magnetically permeable member are attached. An inflow pipe 6 communicating with a water discharge pipe B1 provided in the purifying device B is exposed at a position where it is desired to be biased to one side above the impeller 4, and the purifying device B performs the primary treatment and the secondary treatment. The drainage is the above water discharge pipe B
1 is discharged onto the impeller 4 through the inflow pipe 6.

On the other hand, the dephosphorization tank 2 is divided into a plurality of treatment tanks 2a and a downstreammost final treatment tank 2b from the upstream side to the downstream side along the flow of waste water, and the water surface of the final treatment tank 2b is divided. The discharge pipe 9 is opened.

A cylindrical filter frame 7 is replaceably mounted on each of the processing tanks 2a. Both sides of the cylindrical filter frame 7 are slidably held upward by the filter frame guides 10 provided in the processing tanks 2a. Further, as shown in FIG.
A positioning recess 7c is formed at the bottom of the cylindrical filter frame 7, and a positioning projection 2c that engages with the positioning recess 7c.
Is formed at the bottom of each of the processing tanks 2a.

An inflow port 7a is formed at the bottom of the side surface of the cylindrical filter frame 7 which faces the upstream direction, and an advection pipe 8 is provided at the upper part of the side surface of the cylindrical filter frame 7 which faces the downstream direction. And the discharge port of the advection pipe 8 is opened to the adjacent processing tank 2a or the most downstream final processing tank 2b. A large number of magnet particles 5 as an example of a magnetically permeable member are attached to the peripheral surface of the cylindrical filter frame 7 (see FIG. 4), while the filter material 7b is provided inside.
Are loaded interchangeably. The filter material 7b is formed by burning or drying weathered pumice particles, which is typified by so-called Kanuma soil.

Next, the operation of the embodiment having the above construction will be described. When the wastewater which has been subjected to the primary treatment and the secondary treatment in the purifying device B is discharged from the inflow pipe 6 communicating with the main body A of the device to the impeller 4 laterally provided on the water surface of the denitrification tank 1, the impeller 4 is generated. The denitrifying bacteria that rotate and form 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 magnets attached to the surface of the impeller 4. The waste water that has been activated by receiving the magnetic force of the particles 5 and that has flowed into the denitrification tank 1 is denitrified in a favorable environment.

The drainage flowing from the denitrification tank 1 through the baffle 3 into the first treatment tank 2a of the adjacent dephosphorization tank 2 slowly descends, and the cylindrical filter frame installed in the treatment tank 2 is installed. From the inflow port 7a formed in the lower side surface of 7, the inside of this cylindrical filter frame 7 is flown in, and the inside of this cylindrical filter frame 7 rises. Meanwhile, many magnet particles 5 attached to the surface of the cylindrical filter frame 7
As a result, iron is adsorbed, and at the same time, phosphorus attached to the iron is adsorbed. On the other hand, when passing through the tubular filter frame 7, phosphorus and other contaminants in the waste water are adsorbed and removed by the filter medium 7b loaded in the tubular filter medium 7. The filter material 7b is formed by burning or drying weathered pumice particles, which is typically Kanuma soil, and can efficiently adsorb and remove the phosphorus content in the waste water.

As a result, most of the nitrogen and phosphorus contained in the wastewater are removed while the wastewater flows through the treatment tanks 1 and 2a, and the final treatment tank 2b has a very high removal rate of iron and nutrients. Clear effluent (third treated water) is obtained.

The tubular filter frame 7 is a replaceable cartridge type, and phosphorus adsorbed on the tubular filter frame 7 together with the excess sludge can be easily replaced by replacing the tubular filter frame 7 itself. Can be extracted. When a new tubular filter frame 7 is attached to the processing tank 2a, this processing tank 2
The both sides of a are mounted in a state of being engaged with the filter frame guide 10, and the positioning concave portion 7c formed at the bottom is engaged with the positioning convex portion 2c formed at the bottom of the processing tank 2a to position and fix. Since the bottom portion of the tubular frame 7 is positioned and fixed, it is not necessary to set the filter frame guide 10 to be tight with respect to the tubular filter frame 7, and replacement is easy.

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.

[0019]

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.

Further, 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.

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

In addition, the filter medium loaded in the cylindrical filter frame is formed by burning or drying weathered pumice particles, and can efficiently adsorb the phosphorus content and other sludge in the waste water.

Further, as described in claim 2, a new tubular filter frame is formed by forming a positioning portion for positioning the tubular filter frame at the bottom of the tubular filter frame and the bottom of the processing tank. The positioning when mounting the filter is easy, and the tubular filter medium can be easily replaced.

[Brief description of drawings]

[Figure 1] Cross-sectional side view of the wastewater tertiary treatment system

[Figure 2] Plan view of the wastewater tertiary treatment system

FIG. 3 is a perspective view of an impeller

FIG. 4 is a perspective view of a cylindrical filter frame.

FIG. 5 is a sectional side view of a cylindrical filter frame.

[Explanation of symbols]

 A Device main body B Purification device 2 Dephosphorization tank 2a Treatment tank 2b Final treatment tank 2c, 7c Positioning portion 5 Magnetic member 7 Cylindrical filter frame 7a Inlet port 7b Filter medium 8 Advection pipe

Claims (2)

[Claims] 1. In a wastewater tertiary treatment device that communicates downstream of a purification device and thirdly treats wastewater, a dephosphorization tank provided in the main body of the apparatus is provided with a plurality of treatment tanks and a final treatment tank at the most downstream, In each of the above-mentioned processing tanks, a magnetic filter member was mounted on the surface, and a cylindrical filter frame in which a filter material formed by burning or drying pumice weathered particles was loaded was arranged exchangeably. A drainage tertiary treatment device characterized in that a drainage inlet is opened in the lower part of the cylindrical filter frame, and an advection pipe for outflowing the drainage is provided in the upper part, and the advection pipe is opened in the adjacent treatment tank or the final treatment tank. . 2. A tertiary treatment apparatus for waste water according to claim 1, wherein a positioning portion that is engageable with each other is formed on the bottom portion of the cylindrical filter frame and the bottom portion of the treatment tank.