11.12 The block diagram in Figure 11.39 shows a secondary wastewater treatment p
ID: 1709822 • Letter: 1
Question
11.12 The block diagram in Figure 11.39 shows a secondary wastewater treatment plant. a. Identify the various unit operations and flows, and state their purpose or function. Why are they there, or what do they do? b. Suppose you are a senior engineer in charge of wastewater treatment for a metropolitan region. You have retained a consulting engineering firm to design the plant shown. Four firms were considered for the job, and this firm was selected, over your objection, by the metropolitan authority board. There are indications of significant political contributions from the firm to the members of the board. While this plant will probably work, it clearly will not be the caliber of plant you desired, 11.14Explanation / Answer
Answer:
J to F: Preliminary treatment consisting of grit removal or screening and then sewage sedimentation of heavy particles and chemical precipitation of inorganic matter.
F is the pre-settling tank for wastewater. The settled sludge in F (through G) goes to E, which is the sludge digestion chamber. Then H is the sludge sent for drying.
A is the aeration tank. From A, the aerated wastewater goes to B, which is Settling tank, then to I for tertiary treatment of effluent.
From B, wastewater is recirculated to A in process C, and excess sludge goes to E through process D.
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