Wastewater treatment of a fish processing industry in batch anaerobic reactors.
Abstract
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 24h. 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, BOD5.20, 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 BOD5.20 (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.
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