1. The insecticide 2-hydroxyquinoxaline (CsH&N20;) can be degraded in soil syste

Question

1. The insecticide 2-hydroxyquinoxaline (CsH&N20;) can be degraded in soil systems by Bacillus bacteria. For a soil porewater concentration of 42 mg/L, determine the ThOD if Bacillus completely degrades 2-hydroxyquinoxaline to CO2, H 0, and NO under acrobic conditions. 2. A BODs test was used to analyze the oxygen demand for a pollutant discharged intoa stream. Use the BODs test information to answer the following. Initial DO (mg/L) Final DO (mgL ki at 20°C (days) 9.1 0.09 Sample Volume (mLs)60 BOD Test Volume (mLs)300 a. Determine the BODs in units of mg/L b. Determine the BODu units of mg/L. c. The water temperature in the stream is 8'C. Adjust the BOD rate constant to the stream d. Estimate the amount of BOD remaining after 10 days with units of mg/L in the stream; e. Estimate the concentration of non-biodegradable organic material in units of mg/L if the temperature with units of days. the stream temperature 8°C. measured COD is 115 mg/L

Explanation / Answer

d) Using the equation:

BOD10 = BODu * (1-exp^- (k8°c) * (10days) BOD10 = 78.65mg / L * (1-exp^-(0.02days^-1) * (10days)) = 14.26 mg / L

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