What is the principal purpose of anaerobic digestion of sewage sludge?
Correct answer: A. To stabilize organic matter and produce biogas
- A. To stabilize organic matter and produce biogas
- B. To increase the volume of raw sludge
- C. To remove all dissolved salts from sludge
- D. To convert sludge directly into drinking water
Explanation
Anaerobic digestion biologically stabilizes sludge in the absence of oxygen and produces biogas containing methane. It also reduces odor and the amount of volatile organic matter, but does not remove all salts.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Environmental Engineering
Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
Practise Environmental Engineering
80 free Environmental Engineering MCQs from Civil Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Civil Engineering questions like this
Civil Engineering is on 3 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Environmental Engineering questions
A trickling filter treats wastewater mainly by using:
Which sewer arrangement carries domestic sewage and stormwater in the same pipe?
In a water distribution system, chlorine residual is maintained mainly to:
Which solid-waste treatment method uses microorganisms to convert biodegradable waste into a soil-like product?
Which practice best follows the waste-management principle of resource recovery?
A wet scrubber is primarily designed to control air pollution by: