I
Description TWA 6
Process description in general
The Berkefeld drinking water purifier serves for provision of hygienically perfect,
crystal-clear drinking water.
Every normally polluted and germ-contaminated surface or well water can be
treated. The unit is not suitable for desalination of brackish or sea water.
Berkefeld drinking water purifiers operate acc. to the precoat filtration process.
The raw water from rivers, lakes or wells is pumped into 4 pre-treatment tanks (8
m³ each) by means of a motor pump or electr. pump. In the single raw water tank
the chemicals acc. to the Berkefeld EMERGENCY EXERCISE or ACTION
SDP
(
s
tandard
d
osing
p
lan) are added. The addition is effected in four steps with
corresponding retention time. The water pre-treated this way is supplied to the
precoat pump via the surface suction device and via the raw water collector.
In the beginning of the filtering process a certain quantity of filter material (Berkesil
KE) is fed to the precoat filter by the precoat pump. By the following pre-treated raw
water stream the filter material is precoated to the special Berkefeld filter candles
located in the precoat filter, and there it forms the filtering layer. Flow direction in
the precoat filter is upwards (see attachment 6).
After the filtration the required chlorine value in the pure water is adjusted by
means of a chlorine dosator being connected in subsequent position. The
chlorinated pure water is supplied to the pure water tank, and after a retention time
it is supplied as drinking water to tanks or distributors by a pure water pump. By the
secondary chlorination a re-infection is prevented.
With increasing pollution of the filter layer the filter head loss increases. If a filter
head loss of about 3 bar is reached, the filter process is interrupted and the plant is
backwashed. The flow direction in the precoat filter is now downwards. After
backwash, new filter material is precoated and the filter process starts again.
The pure water reservoir facilitates short-term output peaks of about twice the
capacity of the plant.
Since drinking water treatment is of utmost importance it is advisable to
follow these instructions exactly and to practise all processes described in
practice operation with starting and stopping the operation repeatedly.
A reliable operation can only be expected if the manual operation of the
plant has been thoroughly trained on exercises and the operating staff is
well acquainted with the functioning of the plant.
The exercises
must
be repeated every three months since an absolute
reliability in operating such appliances is only guaranteed by constant
repetition.
Attention
!