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- According to the Berner Classification for aqueous environments, which of the following definitions describes the Postoxic stage? O a. Dissolved Oxygen 1mM of Sulfide Species O c. Dissolved Oxygen 0.5% of Saturation (~1 mM) Plants can assist in geochemical metal exploration, because: O a. they carry mineral grains to the surface O b. none of the other options O c. they produce gases that can be analysed between their roots O d. they transport dissolved metals to the surface through their rootsDesign an experiment to solve the following problem:Determine the rate of methanogenesis (CO2 + 4H2 S CH4 +2H2O) in anoxic lake sediments and whether or not itis H2-limited.A microorganism is grown in a fermenter under steady-state conditions. The microorganism growth follows Monod kinetics and the following stoichiometric equation: C3H6O3 +a O2 +b NH3 → c biomass + d CO2 + e H₂O Given that the biomass yield is 0.415 grams of biomass per gram of substrate, determine the respiratory quotient.
- No controls on the release of CH,CI, CH,CI,, or CHCI, have been proposed. What does that imply about their atmospheric lifetimes, compared to those for CFCS, CCl4, and methyl chloroform?Some suggest that lakes without fish populations due to acid depostiion can simply be stocked with young fish. Who might be satisfied with this solution? Explain. Explain why this action does not solve the problem.Describe the primary sources and some of the health problems associated with each of the following pollutants: carbon monoxide (CO) sulfur dioxide (SO2) volatile organic compounds (VOCs) nitrogen oxides
- Explain how these factors: the size of bioaerosol, inspiratory flow rate, flow pattern, inhaled volume, respiratory rate influence the respiratory degration of bioaerosols.outline the factors that negatively affect the viability of microorganisms in aerosols.Select which of the following standard enthalpy of formation values is not zero at 25 C: Check all that apply. Ca(s), 03(g), NO(g), Mg(s), HCl(g)
- c) Explain why the proton Mitchel's proton gradient mechanism is implausible. What is the most important of these and what is the compelling evidence to support these that some of the tenets of chemiosmotic theory need revision.Explain the Alkali reserve ?An activated sludge system operates at a flow rate (Q) of 400 m³/day (and an HRT of 0.129 day) with an incoming BOD (So) of 300 mg/L. Through pilot plant work, the kinetic constants for this system are determined to be Y = 0.5 kg SS/kg BOD, Ks = 200 mg/L, and 2/day. What mixed liquor concentration is necessary to attain a 95% BOD removal? What will the corresponding MCRT be? =