EHS409
Question: Advanced waste water treatement processes can produce potable water from waste water. Which is not an advanced waste water treatment process.
Answer: Primary cholimation
Question: What will not be part of the result if combined sewerage system is adopted for a city with frequent heavy rains.
Answer: Back-flow of sewage will be rampant due to low pressure and poor gradient.
Question: Which of the following factors will impart the least influence on waste water sedimentation in a sedimentation tank?
Answer: Particle shape
Question: What is not a reason for monitoring fats, oils and greese (FOG) in waste-water.
Answer: FOG can be recovered and recycled for re-use in the kitchen.
Question: Which is not true of comminutor and grinder processes in waste water treatment.
Answer: To improve efficiency, comminuting and grinding devices should treat waste water before the sceening process.
Question: What set of components detracts from the list of components of sewage as described by WAHEB (1991)
Answer: Lundry waste water; condensed waste water from evaporator units.
Question: Which of the following types of Biochemical Oxygen Demand (BOD) is the most popular.
Answer: BOD5
Question: Which is not characteristic of simplified sewage system?
Answer: Cost of installation and maintenance will be higher.
Question: Which of the following sludge treatment has the greatest impact of BOD reduction?
Answer: Stabilization
Question: There are some waste waters that are not sewage, and need not be discharge into the sewerage system. They include the following except:
Answer: Effluenct from laundaries
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