Please do MC thanks. 10. Which of the following is/are INCORRECT for the BOD test? (a)...

Please do MC thanks. 10. Which of the following is/are INCORRECT for the BOD test?
(a) Long time necessary to get results
(b) Only biodegradable organic matter can be measured
(c) Acclimated seed needed to get meaningful results
(d) Pre-treatment like dilution may be necessary for toxic wastes and nitrifying conditions
(e) None of the above
4
11. Find the theoretical TOC of 120 g/L glucose (C6H12O6) solution [Given molar mass of C=12,
O=16, H=1].
(a) 12 g/L
(b) 24 g/L
(c) 48 g/L
(d) 96 g/L
(e) 120 g/L
12. Facultative bacteria are able to work in the
(a) presence of oxygen only
(b) absence of oxygen only
(c) presence as well as absence of oxygen
(d) presence of water
(e) None of the above
13. A rapid and significant increase in filamentous organisms in the mixed liquor may be
expected to
(a) result in a far better effluent because of the great amount of surface area for absorption.
(b) plug up the return sludge pumps because the filaments hang upon valves and gasket
in the sludge line.
(c) lead to much denser return sludge because the filaments would tend to strain the
dispersed cells of ordinary organisms out of the effluent.
(d) cause bulking of the sludge solids to the point that some solids might be swept out that
results in turbid, poor quality effluent.
(e) lead to a much lower F/M ratio because the filaments are so totally insoluble.
14. Given the following information, determine the weight percent of volatile components:
Sample = 50 ml
Crucible weight = 21.6329 g
Crucible and dry solids weight = 21.6531 g
Crucible and ash = 21.6380 g
(a) 71.25%
(b) 72.65%
(c) 73.55%
(d) 74.75%
(e) 75.65%

15. Tube A is original sample containing 3000 bacteria/mL; 1 ml of this sample is diluted with 9 mL of sterile distilled water in Tube B; another same dilution practise is made from Tube B into Tube C and 2 mL from Tube C is then incubated on an agar plate medium. The bacterial colonies count observed in this agar plate after incubation would be (a) 15 (b) 30 (c) 60 (d) 120 (e) 300 16. Calculate the time it will take to increase the cell number from 104 CFU/mL to 108 CFU/mL assuming a generation time of 1.5 hr. (a) 5 hr (b) 10 hr (c) 20 hr (d) 40 hr (e) 80 hr 17. The total solids in wastewater would be a combination of: (a) Fixed solids and settleable solids. (b) Dissolved solids and volatile solids. (c) Dissolved solids and suspended solids. (d) Suspended solids and fixed solids. (e) Fixed solids and dissolved solids. 18. A batch reactor is characterized by (a) a constant residence time. (b) variation in extent of reaction and properties of the reaction mixture with time. (c) a very low conversion rate. (d) variation in reactor volume. (e) None of the above 19. Which of the following statement(s) is/are CORRECT for designing an attached growth process? (a) Low range of organic loading rate determined by sufficient food for bacteria (b) High range of organic loading rate determined by oxygen limitations (c) Low range of hydraulic loading rate determined by adequately wetting biofilm (d) High range of hydraulic loading rate determined by biofilm and ponding (low oxygen) (e) All of the above 6 20. Which of the following is a CORRECT statement to describe the complete-mix activated sludge plant? (a) Because of the complete-mix circumstance, the term “mean cell residence time” has no meaning. (b) Because of the complete-mix circumstance, the F/M ratio cannot be calculated. (c) The F/M ratio is significantly higher near the inlet end of the aeration basin than near the outlet of the aeration basin. (d) The rate of oxygen uptake per unit of activated sludge is about the same throughout all of the aeration basin. (e) None of the above.

Expert Solution

Ally Wells answered 11 months ago

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