Chapter Review Questions

14.1 What type of waste treatment pond is most common?

14.2 Give three classifications of ponds based on their location in the treatment system.

14.3 Describe the processes occurring in a raw sewage stabilization pond (facultative).

14.4 How do changes in season affect the quality of the discharge from a stabilization pond?

14.5 A wastewater treatment pond has an average length of 690 ft with an average width of 425 ft. If the flow rate to the pond is 300,000 gpd and it is operated at a depth of 6 ft, what is the hydraulic detention time in days?

14.6 A pond 730 ft long and 410 ft wide receives an influent flow rate of 0.66 ac-ft/day. What is the hydraulic loading rate on the pond in inches per day?

14.7 Name three main parts of the trickling filter, and give the purpose or purposes of each part.

14.8 Name three categories of trickling filter based on their organic loading rate.

14.9 Which classification of trickling filter produces the highest quality effluent?

14.10 What is the purpose of recirculation?

14.11 The recirculation ratio is 0.80. The influent flow rate is 2.3 MGD. What is the total flow being applied to the filter in MGD?

14.12 Why is a settling tank required following the trickling filter?

14.13 List three things that should be checked as part of the normal operation and maintenance procedures for a trickling filter.

14.14 A trickling filter 90 ft in diameter treats a primary effluent flow rate of 0.288 MGD. If the recirculated flow to the clarifier is 0.66 MGD, what is the hydraulic loading rate on the trickling filter in gallons per day per square foot (gpd/ft2)?

14.15 A treatment plant receives a flow rate of 3.0 MGD. If the trickling filter effluent is recirculated at a rate of 4.30 MGD, what is the recirculation ratio?

14.16 Describe the RBC.

14.17 Describe the process occurring in the RBC process.

14.18 Can an RBC be operated without primary settling?

14.19 What does a white, chalky biomass indicate?

14.20 Name two types of RBC media?

14.21 What makes the RBC similar to the trickling filter?

14.22 What makes the RBC perform at approximately the same levels of performance throughout the year?

14.23 Describe the appearance of the slime when the RBC is operating properly. What happens if the RBC is exposed to a wastewater containing high amounts of sulfur?

14.24 The slime in the first stages of the RBC is gray and shaggy. The slime in the last two stages of the train are reddish brown. What does this indicate?

14.25 An RBC unit treats a flow rate of 0.45 MGD. The two shafts used provide a total surface area of 200,000 ft2. What is the hydraulic loading on the unit in gpd/ft2?

CHAPTER

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