Page - 110 - in Intelligent Environments 2019 - Workshop Proceedings of the 15th International Conference on Intelligent Environments

Picture 3. Filtration Assembly Picture 4. Oven Table 3. sample volume according to the measurement range of BOD Measuring range BOD in mg / L Sample volume Denitrifying solution "number of drops" 0_40 428 10 0_80 360 10 0_200 244 5 0_400 157 5 0_800 94 3 0_2000 56 3 0_4000 21,7 1 If there is no measurement history, we consider that the BOD5 = COD * 80% • We label the bottle, place a clean magnetic stirrer in the BOD5 bottle, we fill the rubber black seal with 3-4 drops of KOH solution and place it on the vial, then, we check the temperature of the sample (20 ° C) and place the BOD bottle on the support and check that the agitation is running. We note the position of the sample in the device and lastly, the device is activated (see, picture 5). Picture 5. BOD5 measuring device - Determination of the chemical oxygen demand (COD): The preparation of White with 10 ml of distilled water that are mixed with 5 ml of potassium dichromate and 15 ml of sulfuric acid / silver sulphate solution. We duplicate the white when possible. We prepare a reference solution of 10 ml of reference daughter solution that are mixed with 5 ml of potassium dichromate and 15 ml of sulfuric acid / silver sulphate solution. We refer daughter solution 100mg O2 / L: (mother solution diluted 10 times), we stock solution (1000 mgO2 / L, blue): 2.5 ml and finally, we complete to 25ml by distilled water in a 25ml jar. We prepare a 10 ml sample to be analyzed which is mixed with 5 ml of potassium dichromate and 15 ml of sulfuric acid / silver sulphate solution. The sample is duplicated K.Laaroussi etal. /PhysicochemicalCharacterizationTowardsSmartWaterManagement110