UFC

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3-280-03

23

JULY

Filtration

using

the

plate

and

frame

filter

press

is

generally

desirable

for

sludge

with

poor

dewatering

characteristics

or

for

sludge

that

requires

a

solids

content

more

than

30%,

such

as

sludge

that

is

disposed

of by

incineration.

In

general,

if

sludge

characteristics,

such

as

concentration,

are

expected

to

change

over

a

normal

operating

period,

or if

minimal

conditioning

is

required,

the

variable-volume

press

may be

selected

over

the

fixed-volume

press.

The

paragraphs

that

follow

compare

general

advantages

and

disadvantages

of

the

plate

and

frame

filter

press

with

other

dewatering

processes

(Table

2-2).

The

advantages

and

disadvantages

of

the

variable-volume

recessed

filter

press

versus

the

of

fixed-volume

recessed

filter

press

are

also

presented

(Table

2-3).

Table

2-2.

Advantages

and

disadvantages

of

filter

press

systems

compared

with

other

dewatering

processes.

Advantages

Disadvantages

Large

quantities

of

inorganic

conditioning

chemicals

are

High

solids

content

cake.

commonly

used.

Can

dewater

hard-to-dewater

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Very

high

chemical

conditioning

dosages

or

thermal

conditioning

sludges.

may

be

required

for

hard-to-dewater

sludges.

Very

high

solids

capture.

High

capital

cost,

especially

for

variable-volume

filter

presses.

Only

mechanical

device

capable

of

Labor

cost

may

be

high

if

sludge

is

poorly

conditioned

and

if

producing

a

cake

dry

enough

to

press

is

not

automatic.

meet

landfill

requirements

in

some

locations.

Replacement

of

the

media

is

both

expensive

and

time

consuming.

Noise

levels

caused

by

feed

pumps

can

be

very

high.

Requires

grinder

or

prescreening

equipment

on

the

feed.

Acid

washing

requirements

to

remove

calcified

deposits

caused

by

lime

conditioning

may

be

frequent

and

time

consuming.

Batch

discharge

after

each

cycle

requires

detailed

consideration

of

ways

of

receiving

and

storing

cake,

or of

converting

it to a

continuous

stream

for

delivery

to an

ultimate

disposal

method.

Source:

EPA

()

2-13

Benefits and drawbacks of different types of filter press plates

There are several types of filter press plates available in the market, each with its own set of benefits and drawbacks. Here are some of the main types of filter press plates and their advantages and disadvantages:

1. Recessed Chamber Plates

• Benefits: Recessed chamber plates have a higher capacity for solids compared to other types of plates, which makes them ideal for applications that require a high level of solid retention. They are also easy to clean and maintain.
• Drawbacks: Recessed chamber plates are more expensive than other types of plates, and they require a longer cycle time due to the thick cake that they produce.

2. Membrane Plates

• Benefits: Membrane plates can create a higher pressure differential, which can result in drier cakes and better solid-liquid separation. They are also more efficient at removing solids than other types of plates.
• Drawbacks: Membrane plates are more expensive than other types of plates, and they require more frequent maintenance and replacement due to the wear and tear on the membrane.

3. Plate and Frame Plates

• Benefits: Plate and frame plates are less expensive than other types of plates, and they are versatile and can be used for a variety of applications. They also have a shorter cycle time than recessed chamber plates.
• Drawbacks: Plate and frame plates have a lower capacity for solids compared to other types of plates, and they are more difficult to clean and maintain.

4. Gasketed Plates

• Benefits: Gasketed plates are easy to assemble and disassemble, which makes them ideal for applications that require frequent cleaning and maintenance. They are also less expensive than other types of plates.
• Drawbacks: Gasketed plates have a lower capacity for solids compared to other types of plates, and they are not suitable for applications that require high pressure filtration.

5. Center Feed Plates

• Benefits: Center feed plates have a high capacity for solids, which makes them ideal for applications that require a high level of solid retention. They are also easy to clean and maintain.
• Drawbacks: Center feed plates are more expensive than other types of plates, and they require a longer cycle time due to the thick cake that they produce.

Overall, the choice of filter press plates depends on the specific application and the level of solid-liquid separation required. It is important to consider the benefits and drawbacks of each type of plate and select the one that best fits the requirements of the application.