36-37 DRYDEN AQUA:SPN Master pages 14/7/09 23:56 Page 3
spnfeature
PROBLEM
Dryden Aqua, marine
biologists specialising
in water quality and
water treatment, say
SOL
VED!
the problem of
chlorine disinfection by-products has essentially been solved. The
company has developed a range of products and procedures to prevent
the formation of chlorine disinfection by-product precursors. The
answer, the company claims, comes from understanding biology,
chemistry and the water treatment reactions as a whole
T
he biological components of solution, get bound up in organic matter in will each react with chlorine means you
swimming pool water treatment the filters, or will exit through the surface end up using more chlorine.
systems have never been of the pool water into the atmosphere. “The objective is to eliminate or greatly
considered in any great detail – so “If the chlorine gets bound up as a large reduce chlorine disinfection by-products.
says Dryden Aqua Pool – marine chlorinated organic molecule, it will not In order to achieve this task bacteria can
biologists who specialise in water quality exert a toxicological response, or at least it not be allowed to proliferate on any
and water treatment. will be much less toxic than a chlorinated surface in contact with the water,
They say water treatment systems gas. Volatile chlorinated gas includes otherwise you produce ammonium and
should not be considered as a collection of chemicals such as nitrogen trichloride, tri- inorganic chloramines. The principle
different components, pumps, filters and halomethane (mainly chloroform) and surface is the sand in the filters and
chemicals etc. cyanogen chloride which is a nerve gas. Dryden Aqua have developed the unique
“Instead the system must be treated as The design of the water treatment system; filtration media called AFM out of a €1.2m
a whole, with all the physical equipment the use of sand or AFM media, water flow- Research project with the European
and chemical products working together.” rates, back-wash procedure, use and Commission to solve this problem. AFM
To this end Dryden Aqua are now application rate of flocculants, UVc and also reduces the Legionella and MRSA
involved in helping prepare a new water ozone systems, will all dictate what bacteria risk and will provide much better
treatment specification and standards for happens to the chlorine and the form that protection from the oocysts of
Europe and the Middle East. the chlorine will take. “This is important Cryptosporidia and Giardia.
AFM and the technology developed by because the harm chlorine by-products can “AFM prevents the growth of bacteria in
Dryden Aqua allows chlorine free do to the building, the public and the staff the filter bed, but bacteria will still grow on
disinfectants to work more effectively, and if is related to how volatile the products every other surface in contact with the
you operate a chlorinated system the become when in solution. water including the tiles and pipe work, so
procedures will reduce chlorine consumption “Perhaps we need to re-think how we in order to reduce or eliminate these
and by-products by up to 90%. operate pools and the design of the water bacteria; Dryden Aqua developed the
“The atmosphere in a swimming pool can treatment systems. For example, we know biological flocculant NoPhos.” spn
be very corrosive and one of the chemicals that the use of UV irradiation and ozone
that give pools their characteristic chlorine will chop up organic molecules; this is how
DRYDEN AQUA
smell is nitrogen trichloride. This gas will the process works to kill bacteria. By
telephonesolid 01875 822222
attack concrete, metal and stainless steel to chopping one large organic molecule up
envelopeback
sales@drydenaqua.com
cause stress corrosion cracking of the into many smaller organic molecules that
pc
www.drydenaqua.com
supporting roof structures and ventilation
systems. Not only is nitrogen trichloride
damaging to the building, it is also
“DRYDEN AQUA HAVE DEVELOPED
implicated in causing respiratory distress,
asthma and sensitised allergic reactions
THE UNIQUE FILTRATION MEDIA
among the public and pool staff.
“When chlorine is added to the water it
CALLED AFM OUT OF A €1.2M
may be changed into chloride, which is
okay. The chlorine will also be consumed
RESEARCH PROJECT WITH THE
by pollutants in the water to form
chlorinated products that will either; stay in
EUROPEAN COMMISSION”
Visit our website at
www.swimmingpoolnews.co.uk AUGUST 09 swimming pool news 37
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