JPS6051841B2 - Water collector backwashing device for upflow moving bed adsorption equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water collector backwashing device for an upflow moving bed adsorption device.

Conventionally, in an upflow moving bed adsorption device in which the liquid to be treated is supplied from the lower part of the adsorption tower, allowed to rise through the moving adsorbent layer, and then discharged from the upper part of the adsorbent layer, a water collector with a screen is used to suspend the liquid by dropping the adsorbent. It is placed in an adsorbent layer below the liquid surface to avoid the turbidity of the liquid to be treated, but adsorbents with small particle sizes gather on the surface of the screen and act like filter aids, preventing them from entering the liquid to be treated. It was necessary to prevent suspended solids from being trapped and causing clogging.

It is an object of the present invention to provide a water collector backwashing device for an upflow moving bed adsorption device that can easily clean the water collector.

In order to achieve the above object, the water collector backwashing device of the upflow moving bed adsorption device of the present invention has a water collector backwashing device for an upflow moving bed adsorption device in which the liquid of the adsorption tower is A gas-liquid separator located above the surface level is installed, and the treated liquid conduit led from this gas-liquid separator is connected to the piping outside the adsorption tower on the drainage route from the water collector placed in the adsorbent layer. A sewage discharge pipe connected via a first Ξ-way valve and discharging wastewater immediately after backwashing was connected to the middle of the treated liquid conduit via a second Ξ-way valve. Embodiments of the present invention will be described below with reference to the drawings. 1 is a sealed adsorption tower, 2 is a layer of adsorbent such as activated carbon that gradually moves from top to bottom in the tower, 3 is an outlet for the adsorbed adsorbent provided at the lower end of the adsorption tower 1, and 4 is an adsorption tower.
This is a regenerated adsorbent supply port provided at the upper end of the landing tower 1.

A supply pipe 5 for the liquid to be treated is raised to the liquid level of the adsorption tower 1, and is opened to the lower part of the adsorption tower 1 through a gas-liquid separator 7 having an air breathing valve 6.

Reference numeral 8 denotes a treated liquid water collector having a plurality of gates arranged in parallel in the circumferential direction of the adsorption tower 1 and having a screen, and is disposed in the upper part of the adsorbent layer 2.

Reference numerals 9 denote riser drain pipes communicating with the water collectors 8, and are connected to water collecting grooves 10 arranged around the upper outer periphery of the adsorption tower 1 near the liquid level in the tower.

11 is a processing liquid discharge pipe connected to the water collection groove 10.

Reference numeral 12 denotes a backwash liquid supply header pipe provided around the upper circumferential side of the adsorption tower 1, and is connected to the gas-liquid separator 7 via a branch pipe 13.

Each of the riser drain pipes 9 is connected to a branch pipe 15 from the backwash liquid supply header pipe 12 via a first three-way valve 14 installed in a piping section outside the adsorption tower 1. 16
is a sewage discharge pipe that discharges sewage immediately after backwashing,
It is connected to the branch pipe 15 via a second three-way valve 17.

In the above configuration, the adsorption tower 1 is
The liquid to be treated that is supplied from the lower part of the holder gradually moves up the adsorbent layer 2 and is adsorbed, and is discharged from the water collector 8 through the rising drain pipe 9 to the water collecting groove 10, and then to the treated liquid discharge pipe. 11
is released into the river.

The adsorbent is successively supplied from the regenerated adsorbent supply port 4 of the adsorption tower 1 to form an adsorbent layer 2 in the liquid to be treated filling the tower,
The adsorbent moves within the tower and is successively discharged from the adsorbent outlet 3, where it is regenerated. Backwashing of the water collector 8 is carried out by switching the first and second three-way valves 14 and 17, and the backwash liquid is supplied from the gas-liquid separator 7 via the branch pipe 13 to the supply header pipe 12. The treatment liquid is passed through the branch pipe 15 and is caused to flow back into the water collector 8 as a backwash liquid due to the pressure difference between the treated liquid and the treated liquid in the adsorption tower 1. This backflow loosens the adsorbent that has gathered on the screen surface of the water collector 8 and eliminates the clogging of the screen. Then, the first and second three-way valves 14 and 17 are switched again to flow the suspended water that flows into the water collector 8 immediately after cleaning into the wastewater discharge pipe 16, and then the first three-way valve 14 of the rising drain pipe 9 is switched. Switch to the original state and continue draining the processing liquid. This backwashing operation of the water collectors 8 is performed periodically and sequentially for each water collector 8 while the adsorption tower 1 is in operation. As described above, according to the present invention, even if the water collector becomes clogged, backwashing can be easily performed by simply switching the first and second three-way valves, and the wastewater immediately after backwashing can be transferred to the wastewater. It can be discharged separately through a discharge pipe.

In addition, a gas-liquid separator located above the liquid level of the adsorption tower was provided in the middle of the liquid to be treated supply pipe, and the liquid to be treated conduit led from this gas-liquid separator was placed in the adsorbent layer. Since the drainage route from the water collector is connected to the piping outside the adsorption tower via the first three-way valve, a good liquid to be treated that does not contain gas can be transferred to the water collector without using separate power. It can be supplied as wash water for backflow to the system, and there is no need to reduce the processing capacity of the adsorbent at all.

[Brief explanation of the drawing]

The figure is an explanatory diagram showing an embodiment of the present invention. 1...Adsorption tower, 2...Adsorbent layer, 5.
..... To be treated liquid supply pipe, 8 ..... Water collector, 9
...... rising drain pipe, 10... water collection groove,
12... Backwash liquid supply header pipe, 14...
First three-way valve, 17...Second three-way valve, 16.
...Sewage discharge pipe.

Claims (1)

[Claims] 1. In an upflow moving bed adsorption device in which the liquid to be treated is supplied from the lower part of the adsorption tower, allowed to rise in the moving adsorbent layer, and discharged from the upper part of the adsorbent layer, the liquid to be treated is supplied to the adsorption tower. A gas-liquid separator located above the liquid level of the adsorption tower is provided in the middle of the supply pipe, and a liquid conduit led from the gas-liquid separator is arranged in the adsorbent layer. A sewage discharge pipe is connected via a first three-way valve to the adsorption tower external piping portion of the drainage route from the pipe for discharging sewage immediately after backwashing, and a second three-way valve is connected in the middle of the liquid conduit to be treated. A water collector backwashing device for an upflow moving bed adsorption device, characterized in that the device is connected to the water collector through the upflow moving bed adsorption device.