What gases are produced in anaerobic sludge digesters?
Correct answer: B. Methane, Hydrogen sulfide, and CO2
- A. Methane and CO2 only
- B. Methane, Hydrogen sulfide, and CO2
- C. Methane, Hydrogen sulfide, and O2
- D. Hydrogen sulfide and CO2
Explanation
The type of gases produced by microbial activity depends upon the microbes and the organic substrates they utilize. Certain bacteria, called methanogens, grow anaerobically on cellulosic material and produce a large amount of methane along with carbon dioxide. These bacteria are commonly found in the anaerobic sludge during sewage treatment. Other anaerobic bacteria involved in the process of anaerobic digestion produce other gases like ammonia and hydrogen sulfide.
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Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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