Selection of the best wastewater treatment method in fish processing plants according to the AHP model (case study: Mirod fish processing planet)

Fish processing industry produces a lot of solid waste and wastewater. This wastewater consists of preliminary processing of raw fish, washing planet and offal products of raw waste)blood, viscer....). High fat of the industrial wastewater causes the problem of treatment, disposal and environmental crises. The purpose of this study is to select the best method for organizing and using wastewater treatment of fish processing planet based on the most widely used wastewater management technologies worldwide. Material and methods: This research was done by AHP method. Based on the general conditions in fish wastewater treatment plants in industrial estates and on expert judgments and using technical, economic, environmental, and administrative criteria, the processes are weighted. Treatment of wastewater included trickling filter, aeration lagoon, anaerobic digestion and active sludge. the results obtained are assessed using the Expert Choice Software. Finally the active sludge method with a score of 0/417 in the first priority and aeration lagoon, anaerobic digestion and trickling filter with a score of 0/284, 0/264 and 0/052 in the following priorities according to the opinion experts. According to the technical, managerial, environmental and economical criteria and sub-criteria, the final studies showed that the best way to use the wastewater treatment of the fish factory was the active sludge.