This work addresses the problem of using seawater for cooling and
the associated environmental problems caused by the usage and
discharge of biocides. The discharged biocide and its byproducts
are toxic to aquatic lives and must be decreased below certain
limits on load prior to discharge. The conventional approach has
been to add biocide removal units as an end-of-pipe treatment. This
work introduces an integrated approach to reducing biocide
discharge throughout coordinated strategies for in-plant
modifications and biocide removal. Process integration tools are
used to reduce heating and cooling requirements through the
synthesis of a heat-exchange network. Heat integration among
process of hot and cold streams is pursued to an economic extent by
reconciling cost reduction in utilities versus any additional
capital investment of the heat exchangers. Other strategies include
maximization of the temperature range for seawater through the
process and optimization of biocide dosage. This new approach has
the advantage of providing cost savings while reducing the usage
and discharge of biocides. Usefulness of this approach is
illustrated on a case study.
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