JPS6377508A - Moving bed type water treating apparatus - Google Patents

Abstract

PURPOSE:To continuously obtain clarified water without performing the replacement and regeneration of granular mediums and a backwashing process by separating the fluidized granular mediums from raw water and treated water to perform washing and separation and circulating them and arbitrarily adjusting both the circulated amount of the above-mentioned mediums and the discharged amount of washing water. CONSTITUTION:Granular mediums 10 are passed through holes (a), (b) opened to a control cylinder 6 for the circulated amount thereof and fed to an aeration scrubber 14 and a cylindrical washing chamber 2 and furthermore lifted with a sand lifter 3 while being subjected to secondary sand washing and reached to a solid-liquid separator 15 equipped with a conical type screen cylinder 4 and furthermore subjected to tertiary sand washing with sprayers 5 and uniformly fall on the upper layer part of a granular medium layer, regenerated and circulated. On the other hand, tertiary washing water and sand-lifting water are reached to the lower part of the sand lifter 3 through a washing/pumping return pipe 16 from the solid-liquid separator 15 and one part thereof is again lifted as sand-lifting water and one part is passed through the control holes (a), (b) and treated together with raw water and excess amount of water is discharged as primary washing water through a drainage hole (c) provided on a controller 7 of washing water and drainage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving bed water treatment device, in which raw water to be treated is continuously filtered and biologically treated in an upward flow while forming a counterflow with a washed granular media layer. Then, clear water is obtained.

(1) Industrial application field This invention is useful for tertiary treatment of sewage, industrial wastewater treatment,
It can be used in a wide range of fields, not only for filtration of pool water, but also as a filtration device and treatment device for industrial water supply and water supply.

(2) Conventional technology Up until now, biological treatment or filtration of raw water has generally been carried out using a supernatant water system, a fixed filter bed type filtration system, an activated carbon adsorption '3A system, etc. using aeration circulation in the lower part of the aeration tank using a single granular medium. There were major problems such as large-scale granular media circulation cleaning equipment, backwashing equipment, and replacement and regeneration of filter media.

Furthermore, even in the moving bed type filtration apparatus, it is difficult to wash and separate the granular media, and a large amount of washing water is generated, making it impossible to avoid the problem of mixing of the washing water into the treated water.

Furthermore, it is difficult to adjust the circulation amount of granular media and the amount of washing water depending on the composition and quality of raw water, the quality of treated water, and the properties of granular media. increases in proportion to the amount of pumped sand water, and if the circulating amount of granular media is increased, raw water will be mixed into the treated water and granular media will flow out.

When the amount of sand pumped water is reduced, the sand washing function is hindered, and the circulation of the granular medium is also hindered, resulting in the problem of clogging.

In order to adjust the amount of circulation of these granular media and the amount of washing water, it is necessary to provide a large-scale external device as disclosed in, for example, Japanese Patent Publication No. 57-12434.

(3) Problems to be Solved by the Invention Therefore, the purpose of the present invention is to isolate the fluidized granular medium from the raw water and treated water, wash and separate it, and circulate it to prevent the contamination of the raw water and the washed water into the treated water. By arbitrarily adjusting the circulation rate of the fluidized granular medium and the amount of washing water discharged, a predetermined treated water quality can be obtained according to the water quality and amount of raw water. The purpose is to obtain clear water using water.

(4) Means for Solving the Problem Therefore, in order to prevent mixing of raw water and washing water into the treated water, the present invention provides an isolated washing chamber in the fluidized granular medium layer, and also sets the solid-liquid separator at the water surface. This problem can be solved by installing a granular medium circulation rate adjustment device and a cleaning drainage amount adjustment device according to the raw water properties and granular media properties in the upper part. A processing tank body having a water outflow portion above is filled with granular media, a granular media cleaning chamber cylinder is provided in the center of the granular media layer to form a filtration and processing layer, and a filtration and treatment layer is formed in the center of the cleaning base cylinder.・A sand pumping pipe installed in response to the pumping sand water return pipe,
It is equipped with a cleaning water drainage volume adjustment pipe, and a granular medium circulation volume adjustment pipe is provided inside at the bottom and an aeration device is provided at the bottom of the pipe to form the primary sand washing section. This is a moving bed type water treatment equipment characterized by being provided with a solid-liquid separation device consisting of a formed screen cylinder and a water collection dish, and a tertiary cleaning device using spray.

(5) Effect Therefore, the present invention provides a treatment tank which has a raw water inlet at the bottom and a treated water outlet at the top, and is filled with a flowing granular medium, and the center of the tank has the raw water and the treated water. A washing room is provided which is isolated from the washing room, and the washing room is equipped with a granular medium circulation rate adjusting device, and is also equipped with a primary sand washing device for aeration cleaning, a sand pumping device, a pumped sand washing water return device, and a washing water drainage amount adjusting device. Since a solid-liquid separation device and a tertiary sand washing device are installed above the upper water surface, the washing of granular media and the sand pumping circulation are completely isolated from the raw water and treated water, and the primary sand washing and sand pumping by aeration washing are completely isolated from the raw water and treated water. The granular media undergoes a second sand washing process using a sand pipe and a tertiary sand washing process using water sprayed onto a plate, so that the granular media is thoroughly washed and recycled.

On the other hand, the sand pumping water and the tertiary washing water pass through the return pipe and become sand pumping water again, some of it is discharged outside the equipment as the primary washing water, and some of it is effectively treated together with the raw water, so that This is a water treatment device that can obtain clear water by continuously regenerating fluidized granular media while preventing washing water from entering the water.

(6) Examples Hereinafter, examples of the present invention will be explained with reference to the drawings.
In FIG. 1, in a processing tank body that has a raw water inflow pipe 11 below a processing tank 1 filled with a fluidized granular medium 10 and a treated water outflow pipe 12 above, a cleaning chamber cylinder is provided at the center of the tank. 2 to form a fluidized granular media layer, 1 granular media 1
As shown in FIG. A granular medium circulation amount adjusting tube 6 is provided inside the cleaning chamber tube 2, and the inside of the cleaning chamber tube 2 passes through a hole opened in the adjusting tube and passes through an aeration sand washing device 14 provided at the bottom of the cleaning chamber tube 2. Furthermore, sand is lifted while being subjected to secondary washing by the sand pumping device 3 provided in correspondence with the washing/pumping water return pipe 16, and the conical screen cylinder is provided at the top of the washing chamber cylinder 2 above the treated water surface. The sand reaches the solid-liquid separator 15 equipped with the solid-liquid separator 15, which is equipped with the solid-liquid separator 15, and is then subjected to tertiary sand washing by the spray device 5, and then falls evenly over the entire circumference of the solid-liquid separator 15 onto the upper layer of the granular media layer, where it is regenerated and circulated. .

On the other hand, the tertiary washing water and pumped sand water pass from the solid-liquid separator 15 through the return pipe 16 and reach the lower part of the sand pumping device 3, and some of them are pumped up again as pumped sand water, and some of them are used as part of the granular medium circulation amount. It passes through the adjustment holes a and b and is efficiently treated together with the raw water, and the excess water becomes primary cleaning water, which is then sent to the cleaning water drainage adjustment device installed at the top of the cleaning chamber cylinder 2! i! It is discharged to the outside of the device through a drainage hole C provided at 7.

Therefore, the rotary joint device i! is provided in correspondence with the air supply device of the sand lifting device 3! 17, the granular media circulation amount is 1glff
The granular medium circulation amount is adjusted by rotating the 1Ill cylinder 6 with the lever 6, and the degree of sand washing of the granular medium is adjusted by adjusting the lower-second cleaning air control valve 9 and the sand pumping water air control valve 8. .

(7) Effects of the Invention Accordingly, the present invention performs cleaning, separation, and circulation of fluidized granular media separately from raw water and treated water, and because the cleaning process is performed three times, clean treated water can be obtained, which can be used for drinking water. It can also be used as

Furthermore, since the circulation rate of the granular media can be adjusted arbitrarily, it can be used as a rapid filtration device by increasing the circulation rate, or it can be used as a rapid filtration device by decreasing the circulation rate to generate biofilm on the granular media and perform biological treatment. The amount of circulating granular media can be easily adjusted by adjusting the amount of sand pumping air and adjusting the opening of the circulation amount adjustment hole according to the amount and quality of raw water and the quality of treated water. The degree of cleaning of one granular medium can be arbitrarily adjusted by setting the amount of air, the amount of sand pumping air, and the spray water.

Furthermore, the washing water level adjustment device allows the amount of washing water to be adjusted according to the characteristics of the raw water, the amount of water, and the properties of the granular media.

Treated water with a wide range of predetermined water qualities can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing an embodiment of the present invention, FIG. 2 is a detailed longitudinal side view of the lower part of the cleaning chamber cylinder, and FIG. 3 is a cross-sectional view of the circulation i adjustment bag rflvi. In the figure, 1 is a treatment tank, 2 is a cleaning chamber cylinder, 3 is a sand pumping device, 4 is a conical screen, 5 is a spray device, 6 is a granular medium circulation site adjustment device, 7 is a cleaning drainage water level adjustment device, and 8 is a pumping device. Sand air control valve, 9 is a primary cleaning air control valve, 10 is a granular medium, 11 is an inflow pipe, 12 is an outflow pipe, 13 is a raw water distribution device, 14 is an aeration washing sand device, 15 is a solid-liquid separation device, 16 is 3
Next wash water/pumped sand water return pipe, 17 is a rotary joint, r Patent Applicant” Akashi Purification Co., Ltd. Representative Tatsubu Matsumura Procedural Amendment (Method)

Claims (1)

[Claims] A treatment tank filled with the granular media to be transferred, a washing chamber isolated from the raw water and treated water in the center of the tank, a means for passing water in an upward flow from below the granular media layer, and a means for passing water above the water surface. The water is supplied for cleaning through a conical screen, flows downward and forms a counterflow with the treated water, forming a moving bed type water treatment device, as well as an adjustment tube that adjusts the circulation rate of the granular media at the lower inside of the cleaning chamber cylinder. A moving bed type water treatment device characterized in that a washing water drainage amount adjusting device is provided above the washing chamber cylinder, and further, the tertiary washing water and sand pumping water are returned to the sand pumping device section through a return pipe.