JPS58124507A - Method for washing surface of pressure type multi layer filter basin - Google Patents

Abstract

PURPOSE:To wash a filter material while the surface layer thereof is stirred, by embedding washing water injecting nozzles having stream barrier plates obliquely attached to the front face thereof in the upper layer of the filter material in proper arrangement. CONSTITUTION:When a solid substance is collected to the surface or the surface layer part of a filter material by filtration and the amount thereof reaches a definite amount or more, the supply of raw water is stopped and a washing process is started. At first, a water discharge process is carried out from a water discharge pipe 9 and a drain pipe 10 provided to a filtering tank and completed when an initial water level at the starting stage of the surface washing at about 10cm above sand is detected, a surface washing stage is started. To the surface washing stage a surface washing valve 7a and a drain valve 10a provided to a washing water are opened while all other valves are closed and a filter pump is stopped while a washing pump is driven. By this operation, washing water is injected at a high speed from each nozzle and, when impinged onto a stream barrier plate, the washing of the filter material is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure multilayer supertemperature surface cleaning method.

Rapid overheating affects not only the water supply layer but also the wastewater treatment process.
High JL! It is widely used as ajll equipment.

The filtration equipment used in the wastewater treatment process may be used for biological treatment such as activated sludge method or biological IIx method, or for physical and chemical treatment such as flocculation method or coagulation flotation method. However, the O#1 incoming water often contains a high value of O5゜S. As Gokurui l1liv
It may also be the h value.

In addition, in the case of pressure-type O multi-layer O-temperature O, it is possible to have a high pressure loss, and as shown in Figure 1, the amount of S and SO supplemented is large, so it is difficult to connect to the furnace material due to its high adhesiveness. A large amount of S, which is difficult to peel off, is further trapped inside. , q# In the case of a multi-layer O filtration basin, S and S are captured throughout the entire layer of the upper layer material and the surface layer of the lower layer material, as shown in Fig. 1.

Conventionally, for such one-superheat cleaning, back cleaning with cleaning water, surface cleaning by hitting the # surface with a jet of cleaning water from a nozzle on the surface of the sand layer, back cleaning with air, etc. have been used. -I have been exposed.

Back cleaning with air generally provides sufficient cleaning even in the case of excessive temperature in wastewater @ pressure type multi-layer in the processing process, but it requires an air source, it is difficult to prevent the flow of p-materials, and the equipment is difficult to clean. In addition, back cleaning with cleaning water and surface cleaning of the furnace material from the OS surface, which has been used in the past, are not sufficient. The present invention has been made in view of the above-mentioned 0ATIC @, and a baffle plate is slanted on the front side, and a round washing water injection nozzle with a sediment is attached to the upper layer. Embedded in the material in an appropriate position, and jetted cleaning water at high speed to generate a strong stirring flow that reflects the limited current 1 [K], and by this stirring *, the entire volume of the upper layer P# and the lower layer P#O It is characterized in that the surface layer St is not washed by stirring.

The present invention will be explained below based on illustrated embodiments.

In the figure, 1 is a pressure-type multilayer filtration tank installed during the treatment process of wastewater discharged from factories, workshops, sewage treatment plants, etc., and this filtration tank is dug underground. Even if it's overcharged.
. And this O filtration tank IKFi-Material 11! An inflow pipe 2 for the raw water to be supplied to the waste water P1a and a drain pipe 3 for discharging the filtered treated water (from the lower part of the filter tank) are provided. Each pipe is equipped with a 2.5Kti inflow valve of 2m and a #5 water valve for treated water.Furthermore, the tank 1 is filled with furnace material in a multi-layer system. In the embodiment, the upper and lower layers are the upper layer material 4a and the lower layer material 4b, but the number of layers #i is not limited.Even if the material of the furnace material is the same for both the upper and lower layers, it may be different. A plurality of cleaning nozzles 5 are buried at a predetermined depth in this upper layer p material 4a, but each nozzle 5
As shown in FIG. 2, a baffle plate 6 is arranged so as to be parallel to the surface of the spout material, and facing the cough nozzle at a required distance from the nozzle. This baffle plate 6 is also buried in the upper layer material like the nozzle, but the cleaning water sprayed multiple times by the nozzle flows into this ffi flow ll1L6, and most of it is at a certain inclination angle toward the surface of the upper layer p material. It is arranged with. The baffle plate 6 may be flat or one-sided, and may be fixed to the nozzle or to another member.

A washing water pipe 7 is connected to the nozzle 5, and the washing water pipe is divided into two parts, one of which is connected to the above-mentioned drain pipe 3 via a backflow valve 8.

K, which has passed through the raw water, is supplied through the inflow pipe 2 and is then fed to the pipe material 4a.
, 4b, the treated water is discharged from the drain pipe 3.
Ru. During this raw water, a Fi-filter pump (not shown) is driven and the inflow valve 21. The drain valve Sa is in the state s. Then, when the surface layer sK solids are captured and reach a certain value or more, this is detected by a timer or head loss meter and the supply of raw water is stopped (fIL valve is closed).
Then move on to the cleaning process. First of all, the water drain pipe 9 and the drain pipe 10 provided in the overtank are drain valve Pm and drain valve IQII.
Open I and begin the water draining process. At this time - the overbong is stopped, the inlet valve 2m is closed and the drain valve 3a is closed.

Drainage if 9 m, drain valve 10 m opened and 10 m above the sand
About 5B [0 Detect the starting water level and drain the water! 0 The self-flow process ends when the electrode detects the water level at which backwashing starts, and the backwashing process 11 ends after a set time set by the timer and immediately enters the backwashing process 11. In the self-processing process, strong stirring is performed to remove the peel. 7. Turn on the drain valve IQm, close all other valves, stop the overbong, and drive the cleaning pump. As a result, when the purified water is injected from each nozzle at high speed and collides with the baffle plate, a jet as shown in Figure 2 is generated. A stirring flow of O and water occurs over the surface of the furnace material. It is also possible to create a circular flow throughout the pond in the direction of the nozzle, thereby cleaning the tar material.

Therefore, if backwashing is performed after surface cleaning in this way, it is possible to sufficiently clean pressure-type multi-layer overcurrents in wastewater treatment processes simply by combining surface cleaning with washing water and backwashing. . −

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one layer 14. Fig. 2 is an explanatory diagram when cleaning the spruce material, Fig. 3 is a plan view, Fig. 4 is a sectional view of one embodiment, Fig. 5
The figure shows one chart for work process O7. 1... - Overtank 2... Inflow pipe 2 Heat... Inflow valve 3.10... Drain pipe 5M, 10m... Drain valve 4m, 4b --- Stainless steel S... Nozzle 6.・・Break plate 7 ・Washing water pipe 7! 1 ・Gate flow valve 8 ・Backwash valve 9 ・Drainage pipe 9m ・Drainage valve Patent applicant Fuso Construction Industry Co., Ltd. −, *Agent Kiyoshi Hayashi t!4.・
i'1 imaginary number is Figure 612 08
) Figure 2 Figure r

Claims (1)

[Claims] Pressure-type multi-layer in wastewater treatment process - In case of excessive temperature, the front wall is blocked.
A cleaning water injection nozzle with a tilted groove is embedded in the upper layer material at an appropriate position, and the cleaning water is jetted at high speed to generate a strong agitation flow that is reflected by the baffle plate, and this agitation flow is The entire volume of the upper layer P# and the surface layer S of the lower layer material are stirred and washed by tIII! Pressure-type multi-layer that creates mold - 1 for overtemperature! ! ! Image cleaning method.