Manual deep bed filter with multimedia bed

Deep bed filtration with multimedia bed (anthracite, sand and garnet) with manual control

The Carbotecnia multimedia loaded filter is the best choice when looking for high filtration efficiency, in addition to having a high capacity to retain suspended solids compared to conventional dual and sand filters.

Advantages Applications
  • High efficiency in the retention of suspended solids.
  • Filtration between 5 – 10 microns.
  • Multimedia filters have a higher solids holding capacity than conventional sand and dual filters.
  • Drinking water filtration.
  • Reverse Osmosis Pretreatment
  • Filtration of cooling system feed water
  • Retention and reduction of suspended particles in water.

The manual deep bed multimedia filter

It is a simple, single-tank, manual multimedia filter with Carbotecnia dual loading and manual control valve. Recommended for domestic or commercial use, and operation less than 23 h.

With this filter, a solids filtration efficiency of between 5-10 microns can be obtained. This is achieved by placing the granular media in such a way that the size of the void spaces (pores) decreases along the depth of the filter. The largest particles are captured by anthracite number one with an effective size (E.T.) of 0.85 – 0.95 mm. The remaining particles that make it past the anthracite bed are captured by the 16 x 35 U.S. Std. silica sand bed. Mesh with an E.T. of 0.44 – 0.52 mm, and finally the garnet bed number 30 – 40 with an E.T. of 0.33 – 0.37 mm.

The media used in this filter is a combination of ¼ x ⅛ U.S. Std. silica gravel. Mesh and garnet number 8-12 is placed on top of the silica gravel bed, this material is called high density gravel. This arrangement is necessary because garnet 30 – 40 is a denser material than silica gravel. Failure to place the high-density gravel causes the garnet from the bottom bed and the silica gravel to mix when backwashing.

The granular media used in Carbotecnia multimedia loading are carefully selected in accordance with the quality parameters specified by AWWA in standard B-100.

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)
Manual Valve
Input/Output Connections
Connections Drainage
P_610001
8×44
0,75
8
2,1
10,6
2,8
26,5
7
Purago F1
1″
1″
P_610002
9×48
1
10
2,6
13,3
3,5
34,07
9
Purago F1
1″
1″
P_610003
10×54
1,5
12
3,3
16,7
4,4
37,85
10
Purago F1
1″
1″
P_610004
12×52
2
18
4,7
23,9
6,3
56,78
15
Purago F1
1″
1″
P_610005
13×54
2,5
21
5,5
27,9
7,4
71,92
19
Purago F1
1″
1″
P_610006
14×65
3
24
6,4
32,4
8,6
83,27
22
Purago F2
2″
2″
P_610007
16×65
4
32
8,4
42,4
11,2
109,77
29
Purago F2
2″
2″
P_610008
18×65
5
40
10,6
53,6
14,2
140,05
37
Purago F2
2″
2″
P_610009
21×62
7
55
14,5
73
19,3
166,54
44
Purago F2
2″
2″

Components of a manual multimedia 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 manual control valve: it is the component in which the inlet, outlet and drain connections are made; it allows us to change between the different service or backwash positions manually. Max. operating pressure 125 psi.

Granular filter media: Granular filter media is a bed consisting of anthracite number one with an E.T. of 0.85 – 0.95 mm, silica sand 16 x 35 U.S. Std. Mesh with O.T. of 0.44 – 0.52mm and garnet number 30 – 40 with O.T. of 0.33 – 0.37 mm.

Lower distributor and distribution pipe: The distributor is a micro-grooved element, placed at the bottom of the tank, which allows a correct distribution of the flow in the backwash position and operates as a physical barrier that does not allow the granular medium to escape 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.

Backing 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 manual multimedia 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 media: 3 to 5 years

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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