Resumo

MARIN LEAL, Julio César et al. WASTEWATER TREATMENT OF A FISH PROCESSING INDUSTRY IN BATCH ANAEROBIC REACTORS. Cienc. Ing. Neogranad. [online]. 2015, vol.25, n.1, pp.27-42. ISSN 0124-8170.

In this paper, the treatment of wastewater from a fish processing industry (Manta, Ecuador) in batch anaerobic reactors was evaluated and its adjustment to current environmental standards for discharge was established. For this purpose, laboratory tests were performed in 1 L reactors supplied with sludge from an anaerobic treatment plant of domestic wastewater, with a contact time of 24 h. The effluent was diluted with distilled water in proportions of 33%, 66%, and 100% corresponding to the stages I, II, and III respectively. During each stage, the following parameters were monitored according to standard methods: pH, total alkalinity, BOD₅₂₀, COD, nitrite, ammonium, total Kjeldahl nitrogen (TKN), orthophosphate, sulfate, total suspended solids (TSS) and volatile suspended solids (VSS). Results show removal percentages of organic matter, expressed as BOD_5.20 (37.9±4.1%, 41.8±7.6%, and 46.2±3.2%) and COD (34.7±97%, 36.9±9.2%, and 43.8±4.1%, for the stages I, II and III, respectively), relatively low as a result of the inoculum source used, as well as the salt relative content in industrial effluent. The removals of ammonium, TKN and orthophosphate were between 60-95%, 25-37%, and 6-25%, respectively. The treated effluent requires a post-treatment to reduce organic matter contents and nutrients to the discharge limits allowed in the Republic of Ecuador.

Palavras-chave : Anaerobic sludge; anaerobic treatability; batch reactor; biodegradable matter; industrial effluent.

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