March/April 2020 - 7

WATER TREATMENT
FOOD SAFETY
of the washing process. The company
works primarily with fresh produce
processors and packers in the potato,
vegetable and hard fruit sectors,
providing solutions for the treatment
and reuse of washing water.
Most processors look to end-ofline
solutions when purifying water,
said Blaak. Rather than replenishing
water at each stage in the processing
line, wash water is continuously
cleaned and refreshed using a water
purification installation.
" We only treat the water of the first
washing when it's coming from the field,
for example, potatoes containing sand,
silt, leaves and stones, " explained Blaak.
Installations include technology for
filtration, sand and soil removal, sludge
dewatering and disinfection.
Concerns about water scarcity have also
put pressure on processors to reduce or reuse
wash water wherever possible.
In the first stage, visible, rough
particles are separated out using a
curved screen or rotating drum filter.
At this stage, all material 2 millimeters
in size or higher is filtered out.
After that, fine sand 63 microns and
higher is removed, and then water is
removed from the filtered sand until
it's 70-80 dry solids, making it easy to
handle and transport.
Following this, silt and fine sand less
than 63 microns in size is removed via
sedimentation using a flocculant or
clarifying agent. This is a critical step
in the process, said Blaak. Silt and dirt
is measured to determine how much
flocculant is needed. Sedimentation is
continuously optimized and adjusted
automatically. After this step, treated
water is transparent and visibly clear
again; 80-90% of bacteria, spores,
fungi and pesticides are removed.
The settled sediment is further treated
to remove as much water as possible.
The sludge is pressed until it is a
dry cake of clay. Most processors return
the soil to the field where the crop
was grown.
Does This Look Familiar?
WE WON'T
LEAVE YOU
HANGING!!
* No Flow Interruption * No Bags
* No Cleanup * No Downtime * No Kidding
Filtration Down to 2µ
100% AUTOMATIC SELF CLEANING
WATER FILTRATION SYSTEMS
2672 S. La Cienega Blvd, Los Angeles, CA 90034 USA
(800) 336-1942 (310) 839-2828 www. tekleen.com info@tekleen.com
PRODUCE PROCESS ING
7

http://www.tekleen.com

March/April 2020

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