Reference no: EM132884769 , Length: 11 pages

Advanced Water & Wastewater Treatment

Assignment: Wastewater Treatment Process Design

Table 1 shows a typical wastewater flow rate generated on a normal day from a newly developed community. For your exercise, you need to multiply the flow rate by (1.1+xy*0.01). where x, y are last two digits of your ID, y is the last digit. The flow rate given in Table 1 will be different for different students. Characteristics of wastewater are detailed in Table 2. Characteristics in Wastewater will again be different (see Table2). Additionally, the wastewater contains rubbish such as plastic bottles, toilet paper, silt, and sand. Average wastewater temperature throughout a year is 21 oC.

Q1 Design unit processes (screening, grit chamber, equalization basin, primary sedimentation tank, aeration tank & secondary sedimentation tank) using the water flow rates (Table 1), water characteristics (Table 2), design parameters and guidelines (Table 3). If more data and information are needed, please follow the reference book.

Q2. If you are asked to add the treatment unit to remove the nitrogen, what is/are an additional unit(s) would you add or how the treatment processes will you modify? Draw the flow diagram and explain.

Q3. If the new unit process is designed to remove 25 mg-N/L NH3, calculate the amount of air (kg/day) to be supplied to convert ammonia to nitrate. Calculate the quantity of sludge (kg/day) produced due to NH3-N oxidation. Yield is 0.3.

Q4. PO4-P removal of the designed wastewater treatment process is only 30%. However, PO4-P discharge limit into the receiving water body is < 0.5 mg/L. You are asked to design a chemical treatment process to bring PO4-P < 0.5 mg/L. In such condition, how much alum (based on theoretical calculation) would require in a day?

Q5. During the heavy raining season, the performance of the primary sedimentation tank significantly reduced due to the increased water flow rate. In such condition what would you recommend to improve the performance of the primary sedimentation tank?

Q6. After sometimes of operation of the wastewater treatment plant, heavy metals concentration in the inlet wastewater increased due to the discharge of the industrial wastewater. Due to the increased heavy metals concentration, the performance of secondary treatment process significantly reduced. If you are asked for the solution, what suggestion would you recommend?

Q7. How would you manage the sludge produced from this treatment process? Write stepwise.

Referncing - Harvard style

Attachment:- Wastewater Treatment Process Design.rar