Page - 116 - in Intelligent Environments 2019 - Workshop Proceedings of the 15th International Conference on Intelligent Environments

Figure 8. Graphical representation of the BOD5 of the liquid discharges of the 5 industrial units and the final collector BOD5 monitoring follows that of COD with lower values. It oscillates between 23 and 2462 mg of O2 / l with an average of 1082 mg of O2 / l. Slaughterhouse and final collector values exceed those of the standards for direct discharge. Table 11 and figure 8 show the biochemical oxygen demand of the liquid discharges. 4.8. COD / BOD5 ratio Table 12. Biodegradability COD / BOD5 Sampling point DCO/DBO5 ratio Poultry slaughterhouse 2,05 Vegetable fat 01 1,06 Vegetable fat 02 4,67 Textile industry 3,15 slaughterhouse 1,79 final save-all 4,16 The COD / BOD5 ratio indicates whether the wastewater discharged directly into the environment receptors have characteristics of domestic wastewater (COD / BOD5 ratio below 3) [5]. The results are an indication of the importance of pollutants with little or no biodegradability [6]. The wastewater has a COD / BOD5 ratio ranging from 1.06 mg / l to 4.67 mg / l, i.e. the liquid discharges of the agri-food units are in line with that of the COD / BOD5 domestic wastewater less than 3 [5]. While those of the second unit of margarine production. So, it can be concluded that even if the wastewater of these releases have a high organic load, they are easily biodegradable. Table 12 show the biodegradability levels due the measurement of COD / BOD5 of the liquid discharges. 4.9. BOD5 / COD ratio Table 13. Biodegradability DBO5 / COD Sampling point DBO5/DCO ratio Poultry slaughterhouse 0,49 Vegetable fat 01 0,94 Vegetable fat 02 0,21 Textile industry 0,32 slaughterhouse 0,56 final save-all 0,24 1838.5 23.5 301 471 1193.5 2462 500 Poultry slaughterhouse The company produces vegetable fat 01 The company produces vegetable fat 02 Textile industry slaughterhouse final save-all BOD5 limit Value K.Laaroussi etal. /PhysicochemicalCharacterizationTowardsSmartWaterManagement116