Chemical oxygen demand (COD) is measured through the reaction of organic compoundswith potassium dichromate forming chromium (III) ion. The computation of COD is inthe following: -8000(а — b)COD =× NormalityofFASAWhere:COD = chemical oxygen demand, mg/L= amount of ferrous ammonium sulphate titrant added to blank, mL- amount of titrant added to sample, mL=volume of sample, mL8000 = multiplier to express COD in mg/L of oxygenabа.An influent of domestic wastewater sample was collected from Taman Universitioxidation pond treatment system. The amount of the FAS titrant of 0.545 N added was37.8 mL and 10.7 mL for blank and sample, respectively. Determine the COD of thewastewater when the volume used for the titration is 200 mL but was diluted 5 timesbefore conducting the COD test.b. COD for a domestic wastewater normally ranged between 200 mg/L and 70 mg/L.Based on (a), does the COD of this wastewater falls under this range? Explain yourobservation.c. Then, you were asked to find out the biodegradability of this wastewater by conductinga 5-day biochemical oxygen demand (BOD5). A good indication for a biodegradablewastewater would have a COD/BOD ratio of 2 and above. Here, 55 mL of sample wasemployed for the test where the measured dissolved of oxygen at day 0 was 7.7 mg/Land 2.3 mg/L, respectively. Assess if the wastewater is biodegradable.

Given data, Amount of FAS added to blank a = 37.8 ml Amount of FAS added to sample b = 10.7 ml…

Chemical oxygen demand (COD) is measured through the reaction of organic compounds with potassium dichromate forming chromium (III) ion. The computation of COD is in the following: - 8000(а — b) COD = x NormalityofFAS A Where: COD = chemical oxygen demand, mg/L a = amount of ferrous ammonium sulphate titrant added to blank, mL = amount of titrant added to sample, mL =volume of sample, mL 8000 = multiplier to express COD in mg/L of oxygen b A. An influent of domestic wastewater sample was collected from Taman Universiti oxidation pond treatment system. The amount of the FAS titrant of 0.545 N added was 37.8 mL and 10.7 mL for blank and sample, respectively. Determine the COD of the а. wastewater when the volume used for the titration is 200 mL but was diluted 5 times before conducting the COD test. b. COD for a domestic wastewater normally ranged between 200 mg/L and 70 mg/L. Based on (a), does the COD of this wastewater falls under this range? Explain your observation. c. Then, you were asked to find out the biodegradability of this wastewater by conducting a 5-day biochemical oxygen demand (BOD5). A good indication for a biodegradable wastewater would have a COD/BOD ratio of 2 and above. Here, 55 mL of sample was employed for the test where the measured dissolved of oxygen at day 0 was 7.7 mg/L and 2.3 mg/L, respectively. Assess if the wastewater is biodegradable.

5th Edition

ISBN:9781305084766

Author:Saeed Moaveni

Publisher:Saeed Moaveni

Chapter6: Fundamental Dimensions And Units

Section: Chapter Questions

Problem 23P