This set of Environmental Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Wastewater Treatment of Food Processing Industries – Slaughterhouses”.
1. Slaughterhouses and meat processing industry cannot be divided into which of the following category?
a) Slaughterhouses hogs and cattle
b) Slaughterhouses for poultry
c) Meat processing industry
d) Enhanced nitrogen removal
View Answer
Explanation: Slaughterhouses hogs and cattle, Slaughterhouses for poultry, Meat processing industry and meat cutting plants are the various categories of Slaughterhouses and meat processing industries, whereas, aeration process for removal of nitrogen from waste water is called as enhanced nitrogen removal process.
2. Local butcher shops constitute the majority of the slaughter wastes.
a) True
b) False
View Answer
Explanation: Local butcher shops slaughter wastes are allowed to enter the domestic sewage in urban areas without any sort pf preliminary treatment, and constitutes the majority of the slaughter wastes.
3. Which of the following slaughter residues can be used as raw materials in pharmaceutical industry?
a) Fat and bones
b) Meat unfit
c) Animal carcass
d) Feces
View Answer
Explanation: Meat unfit for human consumption and animal carcass is never used as raw materials in pharmaceutical industry because they require various primary treatment and also unfit for use, Feces are harmful because of presence of E.Coli and several pathogenic bacteria but fat and bones can be used as raw materials in pharmaceutical industry due to their high potential.
4. Which the following is the third division of the slaughterhouse wastes production areas, that includes green line and red line?
a) Yellow line
b) Purple line
c) Blue line
d) Orange line
View Answer
Explanation: The slaughterhouse wastes can be divided into three production areas, truck washing and animal shreds also called as green line, slaughter and cutting also called as red line and stomach, intestine and entrails cleaning also called as Yellow line, there is no such purple, blue and orange lines in slaughterhouse wastes production areas.
5. Which the following is screened and removed from the waste water from green line and then fed into main wastewater stream?
a) Large particles
b) Metal pieces
c) Water
d) Intestine contents
View Answer
Explanation: The waste water from truck washing and animal shreds, green line is screened to remove Large particles and then fed into main wastewater stream, Metal pieces is usually not found, water is not removed from waste water, Intestine contents is removed in the later stage.
6. Which of the following physical method is not followed in the primary waste treatment?
a) Rotating screening drums
b) Separators
c) Fine rakes
d) Algal treatment
View Answer
Explanation: Rotating screening drums, Separators, Fine rakes, separators, screening catchers etc. are physical method of separation and treatment of the green line wastes, whereas algal treatment is a biological method of treatment which is usually not followed.
7. The yellow line constitutes the processing of intestine, stomach and _______ cleaning.
a) Animal Sheds
b) Entrails
c) Fats
d) Slaughter
View Answer
Explanation: Slaughter and cutting is the red line processing step, Animal Sheds the green line, fats residue is used as a raw material, hence, not removed, the yellow line constitutes the processing of intestine, stomach Entrails where it is cleaned.
8. Which of the following organic matter is present in slaughter house waste water?
a) Oil and fats
b) Uranium
c) Radium
d) Chromium
View Answer
Explanation: The organic matter in slaughter house wastewater includes oil and fats which is emulsified, uranium, radium, chromium are the heavy metals which are toxic which is usually not found in slaughter house waste water.
9. Which of the following methods can be used to reduce the BOD load in slaughter house waste water?
a) Biological
b) Chemical
c) Physical
d) Flocculation
View Answer
Explanation: Biological methods can be used to reduce the BOD load in slaughter house waste water, Chemical method can be used to reduce COD and not BOD of water, Physical method would be very tedious and not efficient, Flocculation is also a chemical treatment process.
10. Biological method can also be used for use of water in the irrigation by regenerating the nutrients.
a) True
b) False
View Answer
Explanation: Biological methods can also be used to reduce BOD load and the water can be made fit for irrigation by regenerating the nutrients within the waste water.
11. Which of the following biological method shouldn’t be used for BOD load reduction?
a) Oxidation ponds
b) Activated sludge system
c) Anaerobic biological method
d) Chemical precipitation
View Answer
Explanation: Biological methods such as Oxidation ponds by creating large space methods, activated sludge system which uses various microorganisms for treatment and Anaerobic biological method be used for BOD load reduction in waste water, Chemical precipitation is a chemical method and not a biological method.
12. The treatment of wastewater by the interaction of sunlight, bacteria, and algae using large, shallow ponds are called as ______
a) Oxidation ponds
b) Deoxygenation pond
c) Anaerobic ponds
d) Algal pond
View Answer
Explanation: The treatment of wastewater by the interaction of sunlight, bacteria, and algae using large, shallow ponds are called as Oxidation ponds, in the process of photosynthesis, the algae releases oxygen which is needed by aerobic bacteria to reduce the BOD load of waste water, Deoxygenation pond and Anaerobic ponds requires the absence of oxygen which is not a process in the oxidation pond, Algal pond.
13. Which of the activated sludge system types is not used in slaughter house wastewater treatment?
a) Cascade
b) Single
c) Two stage
d) Parallel
View Answer
Explanation: The activated sludge system types that is used in slaughter house waste water treatment includes various activated sludge systems like Cascade, Single, two stage systems, whereas Parallel sludge system is not used in slaughter house waste water treatment.
14. Wastewater Stabilization Ponds are treated by natural occurring processes.
a) True
b) False
View Answer
Explanation: Wastewater Stabilization Ponds are treated by natural occurring in which black water, greywater and fecal sludge are treated by the influence of solar light, wind, microorganisms and algae in the large, manmade ponds.
15. Which of the following uses long solids retention times to remove biodegradable organic wastes?
a) Oxidation ditch
b) Pond sludge
c) Activated sludge system
d) Maturation pond
View Answer
Explanation: An oxidation ditch is an activated sludge process in which long solids retention time is used to remove biodegradable organics, maturation ponds is for the removal of pathogens, activated sludge system is the biological treatment of wastewater using bacteria, Pond sludge is the accumulation of organic debris at the bottom.
16. Sewage lagoons gives a fruity smell.
a) True
b) False
View Answer
Explanation: Due to insufficient dissolved oxygen and anaerobic digestion, the sewage lagoons give a sulfurous, rotten egg like smell and the sewage odor means lagoon failure due to insufficient circulation to digest influent BOD, hence, the waste accumulates and is digested anaerobically which is comparatively slow process and releases foul smell.
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