This set of Hazardous Waste Management Multiple Choice Questions & Answers (MCQs) focuses on “Biological Treatment – Anaerobic Systems”.
1. Which of the following is the end product of anaerobic degradation?
Explanation: In the absence of aerobic bacteria, anaerobic degradation occurs and decomposed liquor is formed, which requires further treatment.
2. The gases produced from anaerobic degradation process are ________ and ________
a) Nitrogen, sulphur
b) Acetate, nitrate
c) Carbon, methane
d) Methane, sulphur
Explanation: The end products of anaerobic degradation are suspended liquor, and gases mainly comprising of methane and carbon.
3. Non-methanogenic and methane-producing organisms effect anaerobic treatment.
Explanation: Effective anaerobic treatment relies on an optimum balance between non-methanogenic and methane-producing organisms to ensure that waste is not retained in liquor form but in gas.
4. The temperature range for anaerobic process is ________ and ______ degree Celsius.
a) 10-20, 20-30
b) 32-37, 40-55
c) 10-40, 40-55
d) 10-50, 20-47
Explanation: The temperature range for aerobic process is 32-37 and 40-55 degree Celsius i.e. the mesophilic and the thermophilic range.
5. Which of the following gas is toxic to methanogenic bacteria?
Explanation: Oxygen is toxic to methanogenic bacteria, the waste has to be kept anoxic conditions.
6. Soluble ions of heavy metals are toxic above _______ ppm in industrial waste.
Explanation: Soluble ions of heavy metals in industrial waste are toxic above 2 ppm, but their insoluble precipitates are not.
7. Sodium and potassium ions cause strong inhibition above ________ ppm.
Explanation: Sodium and potassium ions cause strong inhibition above 10000 ppm and Chlorinated hydrocarbons can induce complete failure of a digester at concentrations of 1 ppm.
8. Anaerobic digestion is generally applied to BOD wastes above ________ ppm.
Explanation: To make the process economical, sufficient methane has to be generated to maintain temperature, therefore anaerobic digestion is generally applied to BOD wastes above 6000 ppm.
9. The heat value in a digestion tank of an anaerobic process is _______ kJ/m3.
Explanation: The heat value in a digestion tank of an anaerobic process is 220 kJ/m3, with about 0.94 m3 of gas formed per kilogram of VSS destroyed and about 60% methane.
10. Anaerobic treatment is mediated through _______
a) Enzyme catalysis
Explanation: Anaerobic treatment is mediated through enzyme catalysis and depends on maintaining a balance of microbial population.
11. The treatability of the hazardous waste depends upon ________ content.
Explanation: The treatability of the hazardous waste depends upon the susceptibility of the hydrocarbon content to anaerobic biological degradation.
12. Which of the following parameters effect operating conditions of anaerobic treatment process?
a) Influent quality
Explanation: Influent quality, the biological activity of the reactor and the quality of the reactor environment effect operating conditions of anaerobic treatment process.
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