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Identify (stepwise) the process of purifying drinking
water. What important contaminants are targeted by
each step in the process?
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- Which of the following is not a stage in purifi cation of drinking water: a. fi ltration c. activated sludge b. chlorination d. sedimentationState the purpose and importance of each process step in wastewater treatment.Discuss the process of purifying drinking water and the importance of each step in the removal of contaminants.
- Which of the following treatments of sewage involves the use of anaerobic bacteria?A. Primary sedimentation tanksB. Aeration tanks in secondary treatmentC. Settling tanks in secondary treatmentD. Flat plate collectorE. Sludge digesterWastewater treatment process is endothermic or exothermic?match coloumn a to coloumn b coloumn a coloumn b 11. Safe drinking water is totally free from chemicals.12. Total bacteria present in water samples from water vending machines isdetermined using an enzyme-substrate test. 13. All water samples from the La Trinidad water district must report <1.1 MPNper 100 mL total coliform to comply with DOH standards. FALSE All water samplesfrom the La Trinidad water district must report <1.1 MPN per 100 mLthermotolerant coliform to comply with DOH standards.14. Baguio ice plant and cold storage samples must be tested with the presenceof total bacteria, total coliform, and thermotolerant coliform once a month.15. A water sample that contains beyond the maximum acceptable level oftotal coliform must be retested. a. true b. false
- Describe, in order, the 6 steps of cleaning drinking water (filtration, flocculation, corrosion inhibitor, coagulation, chlorination, and sedimentation).A given municipal wastewater can be treated with the following methods. N + AS, Activated sludge with pre-denitrificationAS + N Activated sludge with post-denitrificationor UCT (Biological Phosphorus Purification designed at the University of Cape Town) Which process needs the greatest addition of lime? (choose the right answer) AS + N N + AS UCT Everyone needs the same amount of additivesPrior to better regulatory control of metal release into domesticwastewater systems, crown corrosion of sewer tiles was less ofa problem. Why?