Automatic deep bed filter with dual beds

Dual sand and anthracite bed filtration with automatic control

The Carbotecnia dual-loaded filter is ideal for use in applications where the water contains a high concentration of suspended solids and when the filtration rate is high.

The deep-bed filter with dual loading and automatic valve

It is ideal for use in applications where the water contains a high concentration of suspended solids and a high filtration rate is required.

This dual camba filter consists of a bed of number one anthracite with an effective size (E.T.) of 0.85 – 0.95 mm; placed on a bed of 16 x 35 U.S. Std. silica sand. Mesh with an E.T. of 0.44 – 0.52mm, 1/8 x 1/16 U.S. Std. silica gravel is used in this filter. Mesh as a support medium.

The granular media used in the Carbotecnia dual bed are evaluated in accordance with the quality parameters specified by AWWA in standard B-100.

Automatic filters with standard valves (Aquatrol):

Code
Tank size (in)
Bed volume(ft3)
Normal service flow (lpm)
Normal service flow (gpm)
Maximum service flow (lpm)
Maximum service flow (gpm)
Backwash flow (lpm)
Backwash flow (gpm)
Automatic Valve (Aquatrol)
Input/Output Connections
Connections Drainage
P_611023
8×44
0.75
9
2.5
13.2
3.5
26.5
7
AQT-275FT
1″
¾”
P_611024
9×48
1
12
3.1
16.7
4.4
34.07
9
AQT-275FT
1″
¾”
P_611025
10×54
1.5
15
3.9
20.8
5.5
37.85
10
AQT-275FT
1″
¾”
P_611026
12×52
2
21
5.5
29.9
7.9
56.78
15
AQT-275FT
1″
¾”
P_611027
13×54
2.5
24
6.4
34.8
9.2
71.92
19
AQT-275FT
1″
¾”
P_611028
14×65
3
28
7.5
40.5
10.7
83.27
22
AQT-275FT
1″
¾”
P_611029
16×65
4
37
9.8
53
14
109.77
29
AQT-285FT
1 ½”
1″
P_611030
18×65
5
47
12.4
67
17.7
140.05
37
AQT-285FT
1 ½”
1″
P_611031
21×62
7
64
16.9
91.2
24.1
166.54
44
AQT-285FT
1 ½”
1″
P_611032
24×72
10
83
22
118.8
31.4
227.1
60
AQT-315FT
2″
2″
P_611033
30×72
15
130
34.4
185.8
49.1
378.5
100
AQT-315FT
2″
2″

Automatic filters with premium valves (Clack):

Code
Tank size (in)
Bed volume(ft3)
Normal service flow (lpm)
Normal service flow (gpm)
Maximum service flow (lpm)
Maximum service flow (gpm)
Backwash flow (lpm)
Backwash flow (gpm)
Automatic Clack Valve
Input/Output Connections
Connections Drainage
P_611010
8×44
0.75
9
2.5
13.2
3.5
26.5
7
Clack WS1
¾”
¾”
P_611011
9×48
1
12
3.1
16.7
4.4
34.07
9
Clack WS1
¾”
¾”
P_611012
10×54
1.5
15
3.9
20.8
5.5
37.85
10
Clack WS1
¾”
¾”
P_611013
12×52
2
21
5.5
29.9
7.9
56.78
15
Clack WS1
¾”
1″
P_611014
13×54
2.5
24
6.4
34.8
9.2
71.92
19
Clack WS1
¾”
1″
P_611015
14×65
3
28
7.5
40.5
10.7
83.27
22
Clack WS1.25
1 ¼”
1″
P_611016
16×65
4
37
9.8
53
14
109.77
29
Clack WS1.25
1 ¼”
1″
P_611017
18×65
5
47
12.4
67
17.7
140.05
37
Clack WS1.5
1 ½”
1 ½”
P_611018
21×62
7
64
16.9
91.2
24.1
166.54
44
Clack WS1.5
1 ½”
1 ½”
P_611019
24×72
10
83
22
118.8
31.4
227.1
60
Clack WS2/QC
2″
2″
P_611020
30×72
15
130
34.4
185.8
49.1
378.5
100
Clack WS2H
2″
2 ½”
P_611021
36×72
20
187
49.5
267.6
70.7
529.9
140
Clack WS3
3″
3″
P_611022
42×72
30
255
67.3
364.1
96.2
757
200
Clack WS3
3″
4″

Components of a deep bed filter:

Fiberglass tank: made of a single piece lined with fiberglass for mechanical resistance and an inner polyethylene cover. It is maintenance free. Max. operating pressure 150 psi.

Head or control valve: It is one of the main components, in which the inlet, outlet and drain connections are made; it allows us to change between the different service or backwash positions, in an automatic programmed way. Max. operating pressure 125 psi.

Granular filter media: It is a bed made up of anthracite number one with an E.T. of 0.85 – 0.95 mm and silica sand 16 x 35 U.S. Std. Mesh with T.E. of 0.44 – 0.52mm.

Lower distributor and distribution pipe: The distributor or diffuser is a micro-grooved element, which is placed at the bottom of the tank, it allows a correct flow distribution in the backwash position, and operates as a physical barrier that does not allow the leakage of the granular medium to the outlet line, in the service position. There are simple, stack type distributors or distributors with lateral tubes, spider type; their selection depends on the service and backwash flow, as well as the diameter of the tank. Its material of construction is HDPE or ABS. The central pipe is a PVC Ced pipe. 40 connecting the lower distributor to the control head or valve.

Supporting gravel: 1/8 x 1/16 U.S. Std. silica gravel, 1/8 x 1/16 U.S. Std. Mesh as a support medium. Having a micro-grooved distributor eliminates the need to place several beds of gravel of different grain size to avoid loss of material.

Operating conditions of the deep bed filter:

  • Input pH: 3-12
  • Bed height (in): 30 – 40
  • Clearance height for bed expansion (%, min.): 50
  • Hydraulic service load (gpm/ft2): 7-10
  • Hydraulic backwash load (gpm/ft2): 20 – 22
  • Operating pressure: 30 – 100 psi
  • Backwash: by pressure differential > 10 psid or by time every 72 hours max.
  • Lifetime of granular medium: 3 to 5 years}

Available configurations:

Simple automatic filter by time: Carbotecnia single tank equipment with dual loading, with automatic control valve for backwashing by time (every certain number of days or on a certain day of the week). Recommended for domestic or commercial use, and operation less than 23 h. When ordering these units with the premium valves (Clack), they have the option of automatic backwashing due to pressure drop (to make use of this configuration, a differential pressure switch must be requested with your sales consultant).

Multiple automatic filters: This configuration is only available for premium valves with industrial control (Clack WS2H and WS3). With this option, up to 16 units can be operated.

  1. Parallel filters: this option allows all filtration units to operate at the same time, unless a filter in the system is in backwashing stage. This system is programmed in such a way that when one of the filters requires backwashing, either due to time or pressure drop, the backwashing sequence is initiated in series for all the filters in the system, starting with the one that sent the signal.
  2. Progressive flow filters: this option is ideal when water demand varies and we have peak operating flows at different times of the day. This function consists of setting a flow value at which one or more filters will come into operation in order to meet the required flow. A flow value must be specified for the incorporation of each of the filters in the system.

Dual bed deep bed filter.

Dual bed filters provide high filtration efficiency compared to sand filters. Because anthracite is a coarser media than sand, larger spaces are formed between the grains, resulting in a higher suspended solids holding capacity without saturating the top layer of the filter. While the sand bed below the anthracite is responsible for retaining the smaller suspended particles that managed to pass the upper bed. The result of utilizing the full depth of the filter is a lower initial pressure drop and longer times between backwashes.

Advantages
Applications
  • High efficiency in the retention of suspended solids at high filtration velocities.
  • Filtration between 20 – 30 microns or microns.
  • Dual filters have a higher solids holding capacity than conventional silica sand-only filters.
  • Longer filtration cycles between backwashes with minimal pressure drop.
  • Drinking water filtration.
  • Industrial process water filtration.
  • Filtration of effluents or water treatment plants.
  • Swimming pool filtration.
  • Retention and reduction of suspended particles in water.
  • Filtration of surface water from rivers or wells.

More information:

How is a deep-bedded bed composed?

What is deep bed filtration?

What is microfiltration?

What are micrometers, microns or microns?

Difference between water filtration and water purification

Introduction to sediment filtration in liquids

Filter media for liquids

Selection of a distributor or nozzle for a deep bed filter

Disc filters

Source:

The 3 essential steps for reverse osmosis pretreatment + 1 optional step

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