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Disinfection of fresh recycled water with ultrasound at Dow Benelux B.V.

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Disinfection of fresh recycled water with ultrasound at Dow Benelux B.V.

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Samenvatting

The vapour phase of industrial cooling towers is a potential site for the residence and spread of Legionella bacteria, whose control and related legislation are a result of a growing concern. In relation to sustainability goals for water reuse, an effluent fresh wastewater stream at Dow Benelux B.V. in Terneuzen is recycled on site as cooling tower supply. Its disinfection is the aim of this research and for that purpose pilot test was run with low-frequency ultrasound in the sand filters pit (final polishing step of the BIOX plant - WWTP on site) treatment process. The study employed two electric powers - of 20 W and 250 W (time-averaged energy consumptions) converted into acoustic cavitation at 53 kHz in continuous and burst mode, respectively, in a flow-through system with an exposure time of 12-15 min. Ultrasound did not show effectiveness against free-flowing Legionella, but has not been tested for its potential to kill intracellular Legionella in the biofilm, where it was concluded the bacterial culture resides. Suggestions were given for future progress, involving variations of system setup and lab/pilot tests for the rest of the disinfection techniques in case ultrasound does not prove effective for Legionella at all.

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OrganisatieHZ University of Applied Sciences
OpleidingWatermanagement/ Aquatische Ecotechnologie
InstituutDelta Academy
PartnersDow Benelux B.V.,Terneuzen
Gepubliceerd in
Datum2013-06-28
TypeBachelorscriptie
TaalEngels

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