The fish processing industries are characterized by the high volume of water used in the
production stages and the consequent increase in the generation of wastewater, for this,
it is necessary to adopt mitigating measures to reduce waste and effluent production. In
addition, the proposal of wastewater treatment methods for the fish processing industry
presents some difficulties, such as the high concentrations of organic matter and solids
in suspension, and the lack of uniformity in its composition, which is directly related to
the species to be processed. As a way to promote a more sustainable model, the use of
reuse systems is promising to reduce the consumption of this natural resource, in
addition to reducing operating costs. However, in order to propose a reuse system one
must choose the appropriate treatment technology, taking into account the
characteristics of the generated effluents and the normative requirements for this
purpose. In view of these premises, this work aimed to evaluate alternatives to effluent
treatment systems generated by fish processing industries capable of meeting technical,
environmental and economic criteria, in order to comply with industrial reuse
regulations. A Multicriteria Analysis (MCA) was also performed to classify the
treatment systems applied in the following reuse scenarios: potability, industrial
refrigeration, toilets and cleaning of floors and sidewalks. As a result, it has been found
that the combination of multiple processes with the use of advanced tertiary treatment
techniques is appropriate for the treatment of wastewater from the fish industry. The
grouping of effluents with similar characteristics was also feasible, allowing a greater
range of alternatives of reuse and adjustment of the costs and complexity of the system
in function of the needs of each industrial plant.
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