front 1 Why should air binding in filters be avoided? | back 1 Air bound filters can lose media when backwashed |
front 2 Effective removal of turbidity using a filtration process is based on the nature of the suspended particles, types and degree of pretreatment, the chemical characteristics of the water and what other factor? | back 2 The filter type and operation |
front 3 What is the proper layering of media in a multi-media filter from top to bottom? | back 3 Anthracite, sand, garnet, gravel |
front 4 Mudballs in the filter media, filter media shrinkage and cracking are all attributed to what cause? | back 4 Improper or ineffective backwashing procedures |
front 5 A filter is 30 ft long and 30 ft wide, operates at a depth of 8.5 ft and has 24" of sand media. If the flow rate into the filter is 3,600 gpm, what is the filtration rate in gpm/sq ft? | back 5 4.0 gpm/sq ft |
front 6 What is the rule requirement regarding turbidity when using the conventional or direct filtration process? | back 6 Less than or equal to 0.5 NTU in 95% of monthly measurements |
front 7 The Surface Water Treatment Rule (SWTR) requires what percent (%) removal of Giardia cysts and enteric viruses? | back 7 99.9 and 99.99% |
front 8 This filtration process relies on a loading rate of 2-10 gpm/sq ft of filter surface area. | back 8 Gravity filtration |
front 9 Conventional filtration includes which processes in the treatment of water? | back 9 Coagulant addition, flash mixing, flocculation, sedimentation followed by filtration |
front 10 What filtration process requires filter media to be added to the water being treated as slurry where it collects on a septum or other appropriate screening device? | back 10 Diatomaceous earth (DE) filtration |