5) What is the dependent variable measured in the BOD test? (Explain how you reach your conclusion) 6) The BOD test is an indirect measure of the concentration of organic biodegradable materials in a wastewater. Explain in which way is considered an "indirect"
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Related questions
A paper manufacturing company bleaches paper products which results in elevated concentrations of trihalomethanes (THMs) and in particular trichloromethane (TCM; i.e., chloroform) in their wastewater. The company’s consultant has decided to treat this wastewater with granular activated carbon with the hope of achieving an effluent TCM concentration of . Based on the isotherm data generated in Table 1 and associated test information, answer the questions below.
Table 1. Adsorption isotherm results for TCM and GAC. Experiments were conducted at an initial TCM concentration of and in bottles |
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a. Using the isotherm data, which isotherm model – Langmuir or Freundlich – fits the data the best?
b. The treatment system will be operated to achieve less than TCM in the effluent during operation, after which, the GAC will be replaced. At the effluent concentration of , use your isotherm model to estimate the solid phase TCM concentration ().
c. Estimate the carbon usage rate during the period of time between GAC system start-up and breakthrough (TCM effluent concentration of ). Assume the influent TCM concentration is and the flow rate is . Describe the rationale for how you approached this part of the problem.