This set of Environmental Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Wastewater Treatment of Food Processing Industries – Breweries”.
1. Which of the following constituent is absent in beer?
a) Alcohol
b) Carbonic acid
c) Water
d) Cream
View Answer
Explanation: Beer is made up of Alcohol and Carbonic acid and water being the major constituent of almost all the liquid beverages, cream is not present in beer as it is an alcoholic beverage.
2. Which the following is not a kind of beer?
a) Lager
b) Top fermented
c) Bottom fermented
d) Medium fermented
View Answer
Explanation: Different kinds of malt and yeast is used to ferment different kinds of beer. Lager is a type of beer usually accustomed at lower temperatures, Top fermented and Bottom fermented beer depends on the top and bottom separation of the mixture after fermentation, whereas, there is no such medium fermented beer.
3. Which of the following operation steps is not followed after the malting step?
a) Wort production
b) Fermentation
c) Storing
d) Cleaning
View Answer
Explanation: Wort production, Fermentation, Storing, filtration, bottling steps are followed after the malting step, cleaning is done after all the steps are carried out.
4. Starch in the malt is converted into fermentable sugar prior to fermentation step.
a) True
b) False
View Answer
Explanation: Before conversion of malt into alcohol, the starch present in the malt is converted into fermentable sugar prior to fermentation step.
5. Which of the following unit operations does not generate waste water?
a) Brewing
b) Fermentation
c) Packaging
d) Malting
View Answer
Explanation: Malting is a process in which the grain germinated is further dried, so it doesn’t involve any waste water, Brewing, Fermentation and Packaging steps involve a lot of waste water being generated in each step.
6. Which of the following measures is usually lower in brewery wastewater?
a) BOD
b) Temperature
c) pH
d) Turbidity
View Answer
Explanation: Wastewater from the brewery usually have a lower BOD and COD generally with a ratio of 2.0, temperature is generally high due to decreasing wastewater volumes, pH is alkaline in nature, so, its high on the pH scale, turbidity is usually present.
7. Alkaline pH values are usually observed in the bottle washing waste water.
a) True
b) False
View Answer
Explanation: The bottling unit produces a lot of waste water where the bottles get deposited in the bottle deposit unit, alkaline pH values are usually observed in the bottle washing waste water.
8. What of the following is removed during the pre-treatment process?
a) Settable solids
b) Supernatant
c) Homogenization
d) Salting
View Answer
Explanation: Settable solids like shards, bottle caps, spent hops etc., are usually removed during the pre-treatment process, supernatant usually has other waste which goes for secondary treatment, high amounts of salinity observed during the any production process is due to salting processes, homogenization is the process of making the fat globules uniformly distributed.
9. Biological neutralization of alkalis is usually done during the ___________
a) Floatation and fat separation
b) Mixing
c) BOD degradation
d) Pasteurization
View Answer
Explanation: In the BOD degradation step, the Biological neutralization of alkalis can be done using carbon dioxide, Pasteurization is followed during the initial treatment of waste water from dairy industry for decreasing the microbial load in the milk by exposing the it to higher temperatures, Floatation and fat separation is the first step which is followed by Mixing where carbon dioxide is removed.
10. Reactors that run without heating of wastewater, are usually used.
a) True
b) False
View Answer
Explanation: The reactors used for waste water treatment usually run without heating of wastewater and the temperature of the reactors are in the range of 24-36°C.
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