Question

Problem 4: An environmental consultancy firm collected a wastewater sample from a Brewing Industry which contains the following: Ethylene glycol (C2H602): 200 mg/L Phenol (C6H6O): 150 mg/L Methanol (CH3OH): 50 mg/L Ethylene diamine hydrate (C2HioN20): 100 mg/L (C2Hi0N20 is essentially non-biodegradable) Since, the consultancy firm does not have any lab facility, they only rely on the theoretical calculation by themselves and the third party's experimental data. As an environmental engineer working there, you are assigned to answer the following questions: a) Compute the theoretical COD b) Compute the BODs, if the k (10 base) is 0.2/day and BODu to COD ratio is 0.90 c) After biological treatment, the BODs is 30 mg/L. Estimate the COD (ki 0.10/day and BODu to COD ratio is 0.90) (Tips: After oxidation, Ethylene diamine hydrate produces NHs along with CO2 and H20.)

Answer 1