Page 22 - Vol.38-No.2

IRRIGATION

EXPLANATION, METHODS, AND SOLUTIONS FOR CHEMICAL

TREATMENT OF INDUSTRIAL WATER AND WASTEWATER

Fresh water is used in a broad range To avoid common problems expe- tection technology, given that acids will
of process applications including boiler rienced with these materials, it is cru- attack the internals of the pump if left
water and cooling system water treat- cial to use a pump that will precisely in contact. Therefore, it is imperative
ment, as well as food and beverage and gently dose long chain polymers that if a pump develops a tubing leak,
process water treatment, among others. without causing damage to them. Ad- or worse, a rupture, the leak detection
The resulting wastewater must then be ditionally, polymer and flocculants are system will shut the pump down and
properly treated before discharge into slippery, and spills can not only be very alert the operator there is a problem.
local sewer systems. messy, but may also cause hazardous Once the offending chemical is cleaned
conditions for operators. Clean up is from the pump head, and the tubing
RIWHQ GLIÞFXOW DQG FRVWO\ replaced, the pump should return to
To alert operators of leaks and to stop work.
the pumping action, it is important to
ÞQG D SHULVWDOWLF PHWHULQJ SXPS WKDW
is equipped with a built-in tube failure
detection system. The best tube failure
protection systems will detect the pres-
ence of oil and water-based polymers
in the pump head. Once the spill is de-
tected, the pump should automatically
shut down and possess the ability to In addition, it is important the me-
Many chemicals are utilized to aid in energize a relay, thus permitting com- tering pump have smooth, gentle,
the remediation of wastewater. These munication with external equipment and continuous flow. This will prevent
chemicals may be used for the removal such as a backup pump, an alarm, or damage to the chemical being dosed,
of solid particles, for pH adjustment, a SCADA system. as well as prevent a gaseous build-up
odor control, disinfection, foam preven- Effluents present in wastewater must which can cause vapor lock and loss
tion or removal, and sludge removal. have a certain level of pH before they of prime.
In this article we discuss the function can be released or disposed of into a Foaming in the activated sludge pro-
of various types of chemicals used, and sewer network. The pH level is adjust- cess will often develop in wastewater
why we believe a FLEXFLO® peristal- ed with the use of chemicals such as treatment processes. This foam floats
tic dosing pump is the best choice to Sulfuric Acid, Hydrochloric Acid, or and accumulates on the top of tanks.
deliver those chemicals. Phosphoric Acid, Sodium Hydroxide, ,W FDQ PDNH PHDVXUHPHQWV GLIÞFXOW WR
Flocculant and Coagulation polymers and Calcium Hydroxide. An acid or read and may overflow, causing an
are used to aid in the removal of solid base chemical is chosen depending unsafe operating environment. De-
particles. Flocculants separate solid on the pH level of the water. foamers and antifoaming agents can
content in the wastewater from the It is critical in this instance to use a be effectively dosed with a metering
liquid content. A coagulant combines peristaltic metering pump with multiple pump to minimize foam production and
small particles to form larger chain features to combat the effects of the accumulation.
particles. These polymers change the VSHFLÞF S+ DGMXVWPHQW FKHPLFDOV )LUVW These foam inhibitors are either sil-
charge of the particles so that they will the pump’s tubing should be chemi- icone compounds or high boiling al-
combine rather than repel other parti- FDOO\ UHVLVWDQW WR WKH VSHFLÞF DFLG RU cohols. It is critical these foam inhibi-
cles. The resulting long chain polymers base being used. Second, the meter- tors are precisely dosed, as dosing too
will form a thick sludge and settle to ing pump should be equipped with the much or too little can lead to further
the bottom. previously mentioned tube failure de- problems.
Circle 29 on enquiry card

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Grain Cooling The most natural way of grain preservation: :
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GRANIFRIGOR ™ • • Protection against treatment and fungi
insects
Without
chemical
• Short amortisation period
• Low energy demand
• Independent of ambient weather
• No resiratory losses
Genuine for over 50 years!
FrigorTec GmbH • info@frigortec.com • www.frigortec.com Circle 30 on enquiry card

20 Vol. 38 No. 2
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