Question

Wastewater treatment

1. The Ampang Jaya Municipal Council with a population of 350,000 and several industries discharged 11 MGD of raw sewage into an activated sludge system treatment plant. The average concentration of BOD₅ is 240 mg/L and the suspended solids is 260 mg/L.

1. If the average domestic per capita sewage flow is 225 L/c.day, what is the average flow of the industrial wastewater (in MGD)?

4. marks)

2. If the average BOD₅ load from the domestic sewage is 55gcapita^-1day^-1, determine the average daily BOD₅ loading (kg/day) from the industrial wastewater. What is the population equivalent to this BOD₅ loading?

4. marks)

c)   Biological treatment is an important and integral part of any wastewater treatment plant that treats wastewater from either municipality or industry having soluble organic impurities. The MPAJ wastewater is going to be treated in a complete-mix activated sludge plant.

(i) List 3 important parameters of wastewater constituents that can be removed   by a the activated sludge system.

                                                                                                                

(ii) Draw a schematic diagram showing all the typical treatment processes and waste flow paths in the entire municipal wastewater treatment plant. Also show and label the residuals produced by certain processes.

Answer 1