CN213950659U

CN213950659U - Upward flow granular activated carbon adsorption system

Info

Publication number: CN213950659U
Application number: CN202021749416.0U
Authority: CN
Inventors: 杨燕华
Original assignee: Suez Water Treatment Co Ltd
Current assignee: Suez Environmental Technology Beijing Co Ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2021-08-13
Anticipated expiration: 2030-08-20

Abstract

The utility model relates to an upward flow particle activated carbon adsorption system, it includes: the device comprises a contact tank (20), wherein a water distribution system (2) positioned at the lower part, a carbon bed (4) composed of granular activated carbon positioned above the water distribution system, and a water outlet water collecting tank (5) positioned at the upper part are arranged in the contact tank, wherein at least a space for accommodating the expanded carbon bed (4) is reserved between the water outlet water collecting tank (5) and the top of the carbon bed (4); the water inlet pipe (1) is communicated with the contact tank (20) in a fluid mode below the water distribution system (2), is provided with a water inlet valve (V1), and is communicated with the water outlet header pipe (6) in a fluid mode with the water outlet header tank (5); a pump (10) having an input conduit (101) and an output conduit (102), the output conduit (102) being fluidly connected to the contact tank below the water distribution system (2) via a pump valve (V5) and being arranged to maintain or vary the water upwelling rate during operation of the contact tank.

Description

Upward flow granular activated carbon adsorption system

Technical Field

The utility model relates to an upward flow particle activated carbon adsorption system, it is used for drinking water treatment and sewage treatment field.

Background

Activated carbon has a long history of being used in water treatment, and the activated carbon adopted in modern water treatment is mainly prepared by carbonizing and activating bituminous coal or lignite serving as a raw material and is basically divided into two types of Powdered Activated Carbon (PAC) and Granular Activated Carbon (GAC) according to the particle size. In view of the fact that granular activated carbon can be recycled, has high packing density and high adsorption capacity, the granular activated carbon is widely applied to the fields of feedwater treatment and advanced sewage treatment in recent years. Because the packing density of the granular activated carbon is high, the expansion rate of a carbon bed formed by the granular activated carbon is usually low during work, so that the retention rate of the granular activated carbon on suspended matters in water is high, and frequent backwashing is required. In addition, the initial adsorption capacity of the granular activated carbon adsorption tank is very high, and the later adsorption capacity is gradually reduced, so that the activated carbon needs to be replaced after being used for a period of time; however, in the prior art, it is common practice to replace the activated carbon in the entire tank together.

Therefore, there is a need for a granular activated carbon adsorption system that can ensure the expansion rate of a carbon bed composed of granular activated carbon in a tank during operation, facilitate backwashing of the carbon bed, and at the same time, enable continuous renewal of the granular activated carbon.

SUMMERY OF THE UTILITY MODEL

To this end, the present invention provides an upflow granular activated carbon adsorption system, according to one embodiment, which includes:

a contact tank in which are disposed: a water distribution system positioned at the lower part, a carbon bed which is positioned above the water distribution system and is composed of granular activated carbon, a water outlet water collecting tank positioned at the upper part, wherein at least a space for accommodating the expanded carbon bed is reserved between the water outlet water collecting tank and the top of the carbon bed,

a water inlet pipe which is communicated with the contact tank by fluid below the water distribution system and is provided with a water inlet valve,

a water outlet header pipe in fluid communication with the water outlet catch basin,

and the pump is provided with an input pipeline and an output pipeline, the output pipeline is in fluid communication with the contact tank below the water distribution system through a pump valve and is arranged to maintain or change the water ascending flow rate when the contact tank works.

From this, according to the utility model discloses an among the upward flow granular activated carbon adsorption system, carrying out the adsorption and filtration process to intaking, granular activated carbon and rivers reverse contact, the old charcoal of lower part earlier with the contact of intaking promptly, the new charcoal on upper portion then with go out the water contact. The carbon bed is kept stable in the adsorption working process, and the upper layer and the lower layer are basically not mixed even though backwashing is carried out. In addition, the rising flow velocity of water during the operation of the contact tank can be adjusted by the pump and the bursts, so that the expansion rate of the carbon bed can be adjusted, and the effective and efficient adsorption and filtration of the carbon bed can be ensured.

In a more specific embodiment, the output conduit of the pump is fluidly connected to the inlet conduit downstream of the inlet valve through the pump valve to connect to the contact tank through the inlet conduit. The output pipeline of the pump is arranged in this way, so that the whole system is more compact and the structure is simpler while the normal operation of the pump is ensured to realize the setting purpose.

In a more specific embodiment, the input conduit of the pump is fluidly connected to the outlet manifold. From this, the play water of water main can get into in the pump for the normal operating of pump uses through the input pipeline of pump, has realized the hydrologic cycle, and is further favorable to realizing compact system.

In a more specific embodiment, the upflow granular activated carbon adsorption system further comprises one or more backwash drain perforated pipes disposed in the contact tank between the effluent header and the unexpanded carbon bed.

In a more specific embodiment, the pump is also arranged to supply backwash water. This results in a smaller number of components constituting the system, which is advantageous for achieving a more compact system.

In a more specific embodiment, the one or more backwash drain perforations are fluidly connected to a backwash wastewater discharge pipe disposed outside the contact tank, and a discharge valve is disposed on the backwash wastewater discharge pipe. An effective and convenient backwashing of the activated carbon granules of the carbon bed can thereby be achieved.

In a more specific embodiment, the upflow granular activated carbon adsorption system further comprises one or more dosing pipes for dosing new or regenerated granular activated carbon, the outlet of the one or more dosing pipes being disposed below the effluent collection sump.

In a more specific embodiment, the upflow granular activated carbon adsorption system further comprises one or more spent carbon discharge perforated tubes disposed at the bottom of the carbon bed.

Thus, new carbon can be replenished from the upper part and old carbon saturated in adsorption can be discharged from the lower part at regular intervals as required, and the activated carbon in the upper layer gradually replaces the activated carbon in the lower layer which gradually becomes saturated, thereby enabling continuous adsorption operation without interruption. The carbon supplementing and discharging amount and frequency can be flexibly adjusted according to actual needs, so that the method is very suitable for the conditions of large pollutant load change range and high regeneration and replacement frequency of the granular activated carbon.

In a more specific embodiment, the one or more dosing conduits are connected to a storage means for granular activated carbon disposed outside the contact tank.

In a more specific embodiment, the one or more spent carbon discharge perforated pipes are connected to a recovery device disposed outside the contact tank through a spent carbon discharge valve.

In a more specific embodiment, the upflow granular activated carbon adsorption system further comprises a blower disposed outside the contact tank, the blower communicating through a vent pipe provided with a vent valve to below the carbon bed in the contact tank to gas wash the carbon bed. This ensures a more thorough and efficient backwash of the bed when required.

In a more specific embodiment, a gravel and/or quartz sand support layer is provided in the contact tank between the water distribution system and the carbon bed.

In a more specific embodiment, the average particle size of the granular activated carbon is in the range of 0.3mm to 1mm, i.e., 20x50 mesh to 12x40 mesh.

In a more specific embodiment, the contact cell employs an upflow velocity in the range of 12 to 18 m/h.

In a more specific embodiment, the expansion rate of the carbon bed during operation is in the range of 30% to 50%.

In a more specific embodiment, the thickness of the carbon bed at rest is in the range of 1 to 5m and the height at expansion at work is in the range of 1.5 to 8 m.

In a more specific embodiment, the flow rate of backwash water pumped through the pump during backwash is twice the flow rate of water during normal adsorption operation.

In a more specific embodiment, the backwash water upflow rate at backwash is in the range of 20 to 40m/h and expands the carbon bed 70 to 120%.

In a more specific embodiment, the gas flow rate for gas washing is 25 to 60m³/(m².h)。

In a more specific embodiment, the water distribution system is selected from the group consisting of a filter head structure of a filter plate, perforated pipes, U-shaped pipes, or filter bricks.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort. In the drawings:

fig. 1 shows a schematic vertical cross-sectional view of an upflow granular activated carbon adsorption system according to one embodiment of the present invention, wherein the carbon bed in the contact cell has not yet expanded;

fig. 2 shows a schematic vertical cross-sectional view of an upflow granular activated carbon adsorption system according to one embodiment of the present invention, wherein the carbon bed in the contact cell expands during operation;

fig. 3 shows a schematic vertical cross-sectional view of an upflow granular activated carbon adsorption system in which the carbon bed is about to be backwashed, according to one embodiment of the present invention.

List of reference numerals

Contact tank 20

Carbon bed 4

Water distribution system 2

Effluent water collecting tank 5

Bearing layer 3

Water inlet pipe 1

Inlet valve V1

Main water outlet pipe 6

Pump 10

Pump valve V5

Input pipe 101

Output pipe 102

Back-washing drainage perforated pipe 8

Backwash wastewater discharge pipe 9

Discharge valve V2

Blower 11

Vent valve V6

Air duct 111

Drain valve V4

Feeding pipeline 13

Storage device 12

Waste carbon discharging perforated pipe 14

Waste carbon discharge valve V3

Waste carbon recovery device 15

Detailed Description

Hereinafter, an upflow granular activated carbon adsorption system according to an embodiment of the present disclosure is described in detail with reference to the accompanying drawings. To make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure.

Thus, the following detailed description of the embodiments of the present disclosure, presented in conjunction with the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The singular forms include the plural unless the context otherwise dictates otherwise. Throughout the specification, the terms "comprises," "comprising," "has," "having," "includes," "including," "having," "including," and the like are used herein to specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

In addition, even though terms including ordinal numbers such as "first", "second", etc., may be used to describe various elements, the elements are not limited by the terms, and the terms are used only to distinguish one element from another. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the scope of the present disclosure.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally placed when the disclosed products are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used merely for convenience of describing and simplifying the present disclosure, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present disclosure.

As shown in fig. 1-3, according to one embodiment, the present invention provides an upflow granular activated carbon adsorption system including a contact tank 20, wherein the contact tank 20 may be constructed of reinforced concrete or may be a container made of steel or other materials. The height of the contact tank 20 may be several meters, typically 4 to 8 m. The area of the single pool of the contact pool 20 is as small as several square meters, and is as large as hundreds of square meters, generally, 2-3 seats are used for a small number, and dozens of seats can be used for parallel connection. The contact tank 20 is mainly provided with a water distribution system 2 at the lower part and a carbon bed 4 which is arranged above the water distribution system 2 and is composed of granular activated carbon, wherein the water distribution system 2 is usually in a filter head structure of a filter plate, and can also be a perforated pipe, a U-shaped pipe, a filter brick and the like. The upper part of the contact pool 20 is provided with an effluent collecting tank 5, and a height exceeding 80-100% of the expansion rate of the carbon bed is reserved from the top of the carbon bed 4. Optionally, a gravel and/or quartz sand supporting layer 3 is further provided between the water distribution system 2 and the carbon bed 4 in the contact tank 20 to perform preliminary filtration on the influent water to be treated.

As shown in fig. 1 to 3, the upward flow granular activated carbon adsorption system according to this embodiment further includes: a water inlet pipe 1 which is in fluid communication with the contact tank 20 below the water distribution system 2, and on which water inlet pipe 1 a water inlet valve V1 is provided to controllably supply water to the contact tank 20; a water outlet header pipe 6 in fluid communication with the water outlet header tank 5 to draw the effluent, which is adsorbed and filtered by the carbon bed 4 in the contact tank 20, out of the contact tank 20 through the water outlet header tank 5 and the water outlet header pipe 6, and the effluent is transported to an effluent storage site, for example, via a water outlet transport pipe 7 connected to the water outlet header pipe 6; the pump 10 has an input pipe 101 and an output pipe 102, the output pipe 102 is connected to the contact tank 20 via the pump valve V5 under the water distribution system 2, and is configured to maintain or change the water ascending flow rate during the operation of the contact tank 20, i.e. the flow rate of water entering the contact tank 20 can be adjusted by the pump 10 and/or the pump valve V5, so as to adjust or maintain the expansion rate of the carbon bed 4 during the adsorption operation. As shown, in one particular embodiment, the output conduit 102 of the pump 10 is fluidly connected to the intake conduit 1 downstream of the intake valve V1 through the pump valve V5 to be connected to the contact tank 20 through the intake conduit 1, which may ensure a simpler and more compact overall structure. As shown, the inlet conduit 101 of the pump 10 may optionally be fluidly connected to the outlet manifold 6 to enable outlet water circulation, i.e., the use of the produced water of the upflow granular activated carbon adsorption system itself for operation of the pump 10, which further facilitates a compact overall structure.

In the upward flow granular activated carbon adsorption system according to the present invention, the average particle size of the granular activated carbon used is generally between 0.25mm and 1.2mm, i.e., 30x60 mesh to 8x30 mesh; the most commonly used particulate activated carbon has an average particle size of between 0.3mm and 1mm, i.e., 20x50 mesh and 12x40 mesh. The ascending flow speed of water adopted by the contact tank can be 5-25 m/h, usually 10-20 m/h, the most common range is 12-18 m/h, the contact time is 5-12 min, mainly depends on the selected granular activated carbon, and the expansion rate of the carbon bed is 30-50% during work. The height H1 (FIG. 1) of the char bed 4 at rest may be 1-5 m, typically 1.5-3 m, and the char bed height at work expansion may be 1.5-8 m, typically 2-5 m. It should be noted that fig. 1 illustrates the carbon bed 4 in a quiescent state, height H1. Fig. 2 shows the carbon bed 4 in an expanded state during operation, the height of the carbon bed 4 being H2, the design value of H2 being 150% of H1. If the low inflow ramp rate is insufficient to bring H2 to 130% of H1, then the pump 10 is activated to increase the ramp rate to achieve the desired minimum expansion ratio. When the carbon bed 4 reaches an expansion rate of more than 30% during operation, the soluble pollutants in the water are adsorbed by the activated carbon, and the granular impurities in the water can pass through the carbon bed 4 without being trapped by the activated carbon and are discharged with the effluent. The valves V1 and V5 should be kept fully open during normal adsorption filtration operation of the upward flow granular activated carbon adsorption system.

In order to ensure an effective backwash of the carbon bed 4, in a more specific embodiment, the upflow granular activated carbon adsorption system according to the present invention further comprises one or more backwash drainage perforated pipes 8 arranged in the contact basin 20 between the effluent collection sump 5 and the unexpanded carbon bed 4, for example, at a height of 0.5-1.0 m above the top of the carbon bed, provided with several backwash drainage perforated pipes 8 of the same height and uniformly arranged. The backwash discharge perforated pipe 8 is fluidly connected to a backwash waste water discharge pipe 9 provided outside the contact tank, and a discharge valve V2 is provided on the backwash waste water discharge pipe 9 to controllably discharge backwash waste water outside the contact tank 20. Furthermore, to ensure backwash efficiency, a backwash pump may be connected below the carbon bed 4 in the contact tank to provide the desired flow rate of backwash water as required. More specifically, the pump 10 described above for maintaining or changing the expansion ratio of the carbon bed 4 may also be used to supply backwash water, which is advantageous for the compactness of the system.

As shown, optionally, the upflow granular activated carbon adsorption system according to the present invention may further comprise a blower 11 disposed outside the contact tank 20, the blower 11 being communicated to the underside of the carbon bed 4 in the contact tank 20 through a vent pipe 111 provided with a vent valve V6 for gas washing of the carbon bed 4.

Specifically, FIG. 3 shows a state in which the carbon bed 4 is backwashed. The contact tank needs to be backwashed for the carbon bed 4 after long-time work, and generally only needs to be backwashed for 1-3 times per month, if the quality of inlet water is poor or the work expansion rate of the carbon bed 4 is low, the backwashing frequency needs to be increased to 1-3 times per week. If the ideal operation of the carbon bed 4 cannot be fully restored by water backwashing alone, gas washing is required. The air washing is generally carried out 1-2 times per year, and if the quality of inlet water is poor or the working expansion rate of the carbon bed is low, the air washing frequency can be increased to 1-2 times per month.

When the carbon bed 4 is backwashed with water, the water raising speed is firstly increased by the pump 10, so that the carbon bed 4 is looser (the expansion rate is about 100 percent), the disturbance force is increased, and suspended matters which are carried in the water and are wrapped or adhered on the activated carbon particles are stripped. Then, in the process of standing and precipitating, by utilizing the characteristics of high settling speed and slow settling of the granular activated carbon, after the granular activated carbon is settled in place, opening a partial discharge valve V2 to discharge the muddy water on the upper layer. If the washing strength is insufficient, air-assisted scrubbing is used before washing to enhance the stripping action on the suspended matter.

In water backwashing the carbon bed 4, the valves V1, V5 and V2 are first put in the fully closed state, the granular activated carbon layer sinks to the resting state, and at the same time, the drain valve V4 for discharging water in the contact tank 20, which is provided in the lower portion of the contact tank 20, is opened to drain water to lower the liquid level in the contact tank 20 to the top surface of the carbon bed. Starting the pump 10 and opening the pump valve V5 for backwashing, wherein the water amount is about twice of that of the carbon bed 4 during operation, namely the rising flow rate of water in the contact tank 20 is 20-40 m/h, so that the carbon bed 4 expands to 70-120%, the top surface rises to the position below the water outlet water collecting tank 5, then closing backwashing water inlet, and opening the discharge valve V2 for discharging water when the top of the carbon bed 4 falls to the position below the backwashing drainage perforated pipe 8 by about 20-30 cm until the liquid level in the contact tank 20 falls to the height of the backwashing drainage perforated pipe 8. The drainage time is 30 s-3 min, which is related to the depth of the carbon bed 4 and the particle size of the granular activated carbon. And then closing the discharge valve V2, opening the backwashing water inlet again, repeating the procedures for 1-2 times, ending the backwashing, and recovering the water inlet, thereby returning to the normal adsorption work.

In the case of gas washing of the carbon bed 4, the valves V1, V5, V2 and V6 are first put in the fully closed state, the granular activated carbon layer sinks to a resting state, and the drain valve V4 is opened to drain the water to lower the liquid level in the contact tank 20 to the top surface of the carbon bed 4. Starting the blower 11 and opening the vent valve V6, forming an air cushion layer in the structure of the water distribution system 2 below the lower part of the optional filter plate or other types of bearing layers, generally 30 s-1 min, and then increasing the air quantity for air washing, wherein the air quantity is 25-60 m³/(m²H), continuing for 2-4 min, starting the pump 10 and opening a pump valve V5 for backwashing, wherein the water amount is about twice of that in working, so that the carbon bed 4 expands to 70-120%, the top of the carbon bed 4 rises to a position below the water outlet water collecting tank 5, then backwashing water inlet is closed, and a discharge valve V2 is opened for discharging water when the top surface of the carbon bed 4 falls to a position about 20-30 cm below the backwashing drainage perforated pipe 8 until the liquid level in the contact tank 20 falls to the height of the backwashing drainage perforated pipe 8. The drainage time is 30 s-3 min, which is related to the depth of the carbon bed and the particle size of the granular activated carbon. And closing the discharge valve V2, re-opening the backwashing air inlet, repeating the procedures for 1-2 times, then ending the backwashing, recovering the water inlet and returning to the normal adsorption work.

In order to achieve a continuous renewal of granular activated carbon in the contact basin, as shown in the figures, in a more specific embodiment, the upward flow granular activated carbon adsorption system according to the present invention further comprises one or more dosing pipes 13 for dosing new or regenerated granular activated carbon, the outlet of the one or more dosing pipes 13 being arranged below the water outlet header tank 5. After adding new or regenerated granular activated carbon, the residence time adopted by the contact tank 20 can be 5-60 min, usually 8-30 min, depending on the adsorption removal efficiency required for pollutants in water. Optionally, the dosing line or lines 13 are connected to a storage device 12 for granular activated carbon arranged outside the contact tank, which storage device 12 is for example also arranged to wet the granular activated carbon and to dose the granular activated carbon. Furthermore, more specifically, the upward flow granular activated carbon adsorption system according to the present invention may further include one or more waste carbon discharge perforated pipes 14 disposed at the bottom of the carbon bed 4, for example, a plurality of waste carbon discharge perforated pipes 14 having the same height and uniformly arranged for discharging waste carbon are disposed above the supporting layer 3. Optionally, the one or more waste char discharge perforated pipes 14 are connected to a waste char recovery device 15 disposed outside the contact tank 20 through a waste char discharge valve V3.

Thus, after being prepared into a char slurry or being wetted, new or regenerated granular activated carbon is periodically added into the contact tank from below the effluent collection sump 5 and above the top of the char bed 4 in the contact tank 20. The dosage and the dosage frequency of each time depend on the actual water treatment effect and the activated carbon saturation of the carbon bed 4. The average addition amount of the carbon can be from several mg/L to hundreds of mg/L, and is generally 5-50 mg/L. The active carbon is not required to be added continuously, if the adding amount is large, the active carbon can be added for several times every day, and if the adding amount is small, the active carbon can be added once every 2-3 days. In order to uniformly distribute the adding materials and avoid blockage, the active carbon adding pipeline 13 can adopt a one-pipe one-hole type, the quantity of the pipeline 13 and the adding outlets depends on the size of the contact tank, and the area of the outlet of each adding pipeline 13 is generally not more than 10m²(pitch)<3.5m) and for example at an angle of around 60 deg. to the horizontal. The residence time of the activated carbon in the contact tank 20 can vary from a few days to several hundred days, depending on the height of the carbon bed 4 and the amount of activated carbon dosed.

The removal of saturated granular activated carbon from the lower part of the contact tank 20 is performed by means of one or more waste carbon discharge perforated pipes 14 arranged at the bottom of the carbon bed 4, which for uniform discharge may be branched perforated pipes for contact tanks with larger areas. The discharge amount and frequency of saturated activated carbon depend on the adding amount of carbon and the capacity of a waste carbon recovery device, the saturated activated carbon can be discharged for 2-5 times per carbon adding, and the discharge amount of each time is the sum of the adding amounts of the carbon discharging last time.

In addition, in this case, valves V1, V5 remain fully open, valves V2, V4, V6 remain fully closed, and V3 remains normally fully closed, and is only opened during carbon rejection. In this case, the valves V1 and V5, V2, V3 and V6 are kept in a fully closed state during backwashing or gas washing.

From this, according to the utility model discloses an upward flow granule active carbon adsorption system does not basically have the filtration to hold back the effect to the suspended solid in the intaking, consequently is fit for the activated carbon adsorption of the high clarified water of turbidity and the sewage second grade biochemical treatment factory effluent to the back flush frequency is extremely low, and the water washing frequency exceeds once a month, the gas washing frequency is 1 ~ 2 times every year. And according to the utility model discloses an adsorption process in upward flow granular activated carbon adsorption system's adsorption in-process granular activated carbon is reverse contact with water, the old charcoal of lower part earlier with the contact of intaking promptly, the new charcoal and the contact of play water on upper portion. The carbon bed is kept stable in the adsorption working process, and the upper layer and the lower layer are basically not mixed even though backwashing is carried out. The new carbon can be supplemented from the upper part and the old carbon with saturated adsorption can be discharged from the lower part regularly and regularly according to the requirement, and the activated carbon on the upper layer gradually and slowly replaces the activated carbon on the lower layer which gradually becomes saturated, so that uninterrupted continuous adsorption work can be carried out. The carbon supplementing and discharging amount and frequency can be flexibly adjusted according to actual needs, so that the method is very suitable for the conditions of large pollutant load change range and high regeneration and replacement frequency of the granular activated carbon.

Furthermore, the test shows, according to the utility model discloses an upward flow granule active carbon adsorption system can realize following effect:

water with higher suspended matter content (suspended matter SS >5mg/l) can be treated;

more than 50 percent of Total Organic Carbon (TOC) in water can be removed by adsorption;

the removal rate of 12 indicative artificial micro pollutants reaches more than 80 percent;

the effective adsorption capacity of the carbon bed unit is not obviously reduced after the operation for months.

The exemplary embodiment of the upward flow granular activated carbon adsorption system proposed by the present invention has been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations of the various technical features and structures proposed by the present invention can be made without departing from the scope of the present invention.

The scope of the present disclosure is not defined by the above-described embodiments but is defined by the appended claims and equivalents thereof.

Claims

1. An upflow granular activated carbon adsorption system, comprising:

a contact tank (20), in which contact tank (20) there are provided: a water distribution system (2) positioned at the lower part, a carbon bed (4) which is positioned above the water distribution system (2) and is composed of granular activated carbon, a water outlet water collecting tank (5) positioned at the upper part, wherein at least a space for accommodating the expanded carbon bed (4) is reserved between the water outlet water collecting tank (5) and the top of the carbon bed (4),

a water inlet pipe (1) which is communicated with the contact tank (20) in a fluid manner below the water distribution system (2) and is provided with a water inlet valve (V1),

a main water outlet pipe (6) in fluid communication with the water outlet catch basin (5),

a pump (10) having an input conduit (101) and an output conduit (102), the output conduit (102) being fluidly connected to the contact tank (20) below the water distribution system (2) via a pump valve (V5) and being arranged to maintain or vary the water upwelling flow rate during operation of the contact tank (20).

2. An upflow granular activated carbon adsorption system as in claim 1, characterized in that the output conduit (102) of the pump (10) is fluidly connected to the inlet conduit (1) downstream of the inlet valve (V1) through the pump valve (V5) to be connected to the contact tank (20) through the inlet conduit (1).

3. An upflow granular activated carbon adsorption system as in claim 2, wherein the inlet conduit (101) of the pump (10) is fluidly connected to the outlet header (6).

4. An upflow granular activated carbon adsorption system as in claim 3, further comprising one or more backwash drain perforations (8) disposed in the contact tank (20) between the effluent header tank (5) and the unexpanded carbon bed (4).

5. An upflow granular activated carbon adsorption system as in claim 4, in which the pump (10) is also arranged for supplying backwash water.

6. An upflow granular activated carbon adsorption system as in claim 5, wherein the one or more backwash drain perforated pipes (8) are fluidly connected to a backwash wastewater discharge pipe (9) disposed outside the contact tank (20), a discharge valve (V2) being provided on the backwash wastewater discharge pipe (9).

7. An upflow granular activated carbon adsorption system as in any of claims 1 to 6, characterized in that it further comprises one or more dosing pipes (13) for dosing new or regenerated granular activated carbon, the outlet of the one or more dosing pipes (13) being arranged below the effluent collection sump (5).

8. An upflow granular activated carbon adsorption system as in claim 7, further comprising one or more spent carbon discharge perforated tubes (14) disposed at the bottom of the carbon bed (4).

9. An upflow granular activated carbon adsorption system as in claim 7, wherein the one or more dosing pipes (13) are connected to a granular activated carbon storage device (12) disposed outside the contact tank (20).

10. The upflow granular activated carbon adsorption system of claim 8, wherein the one or more waste carbon discharge perforated tubes (14) are connected to a recovery device (15) disposed outside the contact tank (20) through a waste carbon discharge valve (V3).

11. An upflow granular activated carbon adsorption system as in any one of claims 1 to 6, characterized in that it further comprises a blower (11) provided outside the contact tank (20), the blower (11) being communicated below the carbon bed (4) in the contact tank (20) through a vent pipe (111) provided with a vent valve (V6) to gas wash the carbon bed (4).

12. An upflow granular activated carbon adsorption system as in any of claims 1 to 6, characterized in that a gravel or quartz sand support layer (3) is provided in the contact tank (20) between the water distribution system (2) and the carbon bed (4).

13. The upflow granular activated carbon adsorption system of any one of claims 1 to 6, wherein the average particle size of the granular activated carbon is in the range of 0.3mm to 1mm, i.e., 20x50 mesh to 12x40 mesh.

14. An upflow granular activated carbon adsorption system as in any of claims 1 to 6, characterized in that the contact cell (20) employs an upflow velocity in the range of 12 to 18 m/h.

15. An upflow granular activated carbon adsorption system as in any one of claims 1 to 6, characterized in that the expansion rate of the carbon bed (4) in operation is in the range of 30% to 50%.

16. An upflow granular activated carbon adsorption system as in any one of claims 1 to 6, characterized in that the thickness of the carbon bed (4) at rest is in the range of 1 to 5m and the height at expansion at work is in the range of 1.5 to 8 m.

17. An upflow granular activated carbon adsorption system as in claim 5 or 6, wherein the flow rate of backwash water pumped by the pump (10) at backwash is twice the flow rate of water at normal adsorption operation.

18. An upflow granular activated carbon adsorption system as in claim 5 or 6, characterized in that the backwash water rising flow rate at the time of backwashing is in the range of 20 to 40m/h and expands the carbon bed (4) by 70 to 120%.

19. The upflow granular activated carbon adsorption system as in claim 11, wherein the gas flow rate for the gas washing is 25 to 60m³/(m².h)。

20. Upflow granular activated carbon adsorption system as in any of claims 1 to 6, characterized in that the water distribution system (2) is selected from a filter plate filter head structure, perforated pipe, U-shaped pipe or filter brick.