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D21WW Water and Wastewater Treatment

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Question 1

a) Describe the need for a settling column test in the treatment of water and  wastewater. Explain the methodology and subsequent analysis, including any relevant equations, of the experimental data for discrete particles in dilute suspensions (Type 1 settlement). How would you modify the methodology if the particles were of the flocculent type (Type 2 settlement) and why?

b) The water treatment train for a medium sized town is shown in diagrammatic form in Fig. Q1b. The raw water is derived from two sources: an upland reservoir and a main river.

I. Suggest, giving reasons, one or more additional components to the treatment train if the raw water was from a non-renewable aquifer source.

II. State the chemicals likely to be used at A, B and C and outline their function.

III. Explain the flocculation process and the reasons why flocculation can assist gravity filtration.

IV. Using sketches, briefly describe what happens when chlorine gas is added to water during disinfection. Why is NH3 important in chlorine disinfection?

V. Compare and contrast rapid and slow sand filters. What advantage is offered by graded heterogeneous rapid sand filter media? Using the sketch of a 2-layer heterogeneous media to illustrate, describe how the layering of the graded materials should be carried out to achieve the best effect.

Question 2

a) Show a diagram of the treatment train for a conventional wastewater treatment plant, including the receiving water body and distinguishing between flow and sludge lines. Briefly describe the need for the unit processes and operations shown on your diagram and quote relevant design/control parameters.

b) Table Q2 (b) shows the characteristics of a treatment plant effluent and those of the river to which it is discharged. Determine the stream characteristics (flow and quality) immediately after mixing with the waste. If you were a river pollution control inspector, would you have approved the discharge of this effluent into the stream and why? Give a well-reasoned argument for your answer

Discuss the need for sludge thickening at wastewater treatment installations. A wastewater treatment plant producing both primary and secondary sludges only has gravity thickeners on site. What operational arrangement would you implement for thickening the sludges? What additional facility would you recommend for this works to improve the overall sludge thickening?

d) Discuss the causes of rising sludge and bulking sludge, and their possible control measures.

Question 3

a) Describe the operation of an anaerobic digester, paying particular attention to possible problems that can affect the treatment processes and how these problems may be prevented. List other possible treatment operations for sludge handling.

b) Discuss the purpose of storm tanks in wastewater treatment. How would you estimate the design flow for storm tanks?

c) A town is served by a sewage works, which is to provide full treatment for 3

DWF, the surplus flow being passed to storm tanks. A storm overflow structure upstream of the works is set to spill flow in accordance with the recommendations of the 1971 Technical Committee:

 

D21WW Water and Wastewater Treatment

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