Florida Drinking Water Operator "B" Practice Test

What can be done upstream of the filters to improve performance when increased filtration rates cause higher turbidity?

1. Add a polymer coagulant aid to strengthen the floc

2. Reduce the flow to the filters

3. Increase the size of the filter media

4. Change the source of water

The correct answer is: Add a polymer coagulant aid to strengthen the floc

Adding a polymer coagulant aid upstream of the filters can significantly enhance the filtration process, especially when facing increased filtration rates that lead to higher turbidity. The polymer acts to improve the formation and strength of the floc, which is a clump of particles that forms during the coagulation process. Stronger floc is more effective at capturing smaller particles and contaminants, which is crucial when turbidity levels are elevated. When higher turbidity levels occur, it indicates an increased concentration of suspended solids in the water, which can overwhelm the filtration system. By incorporating a polymer coagulant, the effectiveness of the flocculation process is enhanced, leading to better aggregation of particles that can then be effectively removed by the filters. This method is beneficial for maintaining optimal filter performance and extending filter run times despite the challenging conditions posed by higher turbidity levels. Other methods, such as simply reducing the flow to the filters, could help temporarily but would not address the underlying turbidity problem. Increasing the size of the filter media might change the physical dynamics of the filtration but not necessarily resolve the issues with turbidity. Changing the source of water could be a longer-term solution, but it often involves logistical and regulatory complexities. Ultimately, integrating a polymer coagulant