Figure 1 - available via license: Creative Commons Attribution 4.0 International
Content may be subject to copyright.
Source publication
Fish meal is used as feed for fish, dogs and cats, and in the pharmaceutical industry. Direct electro-oxidation has been used to treat fish meal industry effluent and organic pollutant removal, and was studied in this project. The anode used was titanium coated with ruthenium oxide and the cathode was stainless steel. In addition to organic polluta...
Citations
... Moreover, they are ineffective in degrading refractory compounds, which persist after the biological treatment. Thus, the application of new technologies and integration of different treatment processes for treating these effluents has been studied [3][4][5][6][7][8][9][10][11][12][13][14]. ...
... Using a Ti/ RuO 2 anode, Varadarajan et al. evaluated the EO performance for COD, biochemical oxygen demand (BOD), and total suspended solids removal, during the treatment of a wastewater from fish meal processing industry with a COD of 2236 mg L − 1 , obtaining promising results [11]. In a posterior study, and using the same anode material and similar wastewater, the authors evaluated the EO efficiency for total organic carbon and colour removal [7]. More recently, Á lvarez et al. studied a combined electrocoagulation and electrooxidation process to treat a fishing industry wastewater with a COD of 3500 mg L − 1 and a chloride concentration of 23.5 g L − 1 [14]. ...
The high organic load and the salinity content presented by fish canning wastewater (FCW), although a hindrance to the application of traditional treatment processes, are favourable conditions for the treatment by electrochemical oxidation (EO). In this study, the performance of EO treatment of FCW at different applied current density (j) and electrical charge, using a boron-doped diamond (BDD) anode, was evaluated regarding organic load, nitrogen, and phosphorous removals, biodegradability increment, toxicity reduction, and specific energy consumption. Experimental results showed that, for the range of the applied j studied, the efficiency of the process only depends on the applied electrical charge and that EO, with BDD anode, can effectively promote the depuration of the highly polluted FCW without requiring the addition of chemicals. After an applied charge of 60.5 kC, treated wastewater was obtained with a chemical oxygen demand of 130 mg L − 1 , a biodegradability index of 0.90, and a 2.8-fold reduction in toxicity towards Daphnia magna. Moreover, 80 % of nitrogen and 60 % of phosphorous removal were attained, foreseeing the potential recovery of nutrients through electrochemically mediated precipitation.
