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- 3. Compare batch culture and continuous culture. Draw diagrams for each of them. Describe cell growth phases in batch culture.JQuestion a) Write down the chemical equations for the reactions that take place in the DO test. b) Discuss the environmental significance of DO. c) Why should DO fixation be performed in the field rather than in the laboratory? Data Sheet Volume of solution for titration = Samples Sample A Sample B (i) (ii) (iii) (i) (ii) (iii) Average Average Titration reading Start End (+0.05mL) (+0.05mL) mL Volume of Na2S2O3 (mL) Dissolved Oxygen (DO)(mg/L)Note: If you don't know the solution please leave it but don't give me wrong solution.
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- Consider a suspension that contains virus particles with a diameter of 0.1 μm and a number concentration of 104/mL. Assume that the mixture is stirred in a beaker (G=10 s¹), the temperature is 25°C, and an optimal coagulant dose has been applied (a=1). a. Estimate the time required to halve the free virus concentration (i.e., those not attached to any other particles). b. If the suspension also contains bentonite particles with a diameter of 1 μm and a number concentration of 5×106/mL in addition to the viruses, what is the time required to halve the free virus concentration?(b) Demonstrate that the following equation is dimensionally homogenous. [10 %] Ixc Yp = ye+ Ayc fluid mechanicsThe following mineral analysis was reported for a water sample taken from a municipal groundwater water well. Determine the total, carbonate and non carbonate hardness in mg/L as CaCO3 using the predominant polyvalent cation definition of hardness. All reported as "mg/L as the ion" Iron 0.2 Manganese 0.6 Ammonium 0.5 Sodium 4.7 Potassium 0.9 Calcium 67.2 Magnesium 39 Barium 0.5 Silica 20 Flouride 0.35 Boron 0.1 Nitrate 0 Chloride 4.5 Sulfate 29 Alkalinity 284 as CaCo3 pH 7.6 units
- 2. 2. Bacteria in a certain culture increase at the rate proportional to the number of bacteria present. If the original number increases by 50% in 0.5 hour, how long will one expect three times the original number?BOD of a wastewater sample is determined by incubating the BOD bottles at four different temperatures, 5, 15, 20, 35, and 50°C. i The ultimate BOD of the sample incubated at 10°C would be-----compared to the sample at 50°C. ii. The reaction rate constant, k for sample incubated at 35°C would be- compared to the sample incubated at 5°CSubject : Environmental science