The method by which the leachate from your city’s landfill is treated will determine where your city’s
recreational non-contact water park can be sited. Two options are being considered, which are:
(i) to allow the leachate to discharge into the river where the park will be;
(ii) to first collect the leachate and send it for treatment at your city’s nearby wastewater
treatment plant.
Your company has been asked to find the most suited location and you are leading the study on its
technical feasibility.
The following constraints have been defined for siting the park:

1. The park must be at least twenty (20) kilometres downstream from the landfill leachate discharge;
2. It must be as close as possible to the landfill;
3. The DO must be at least 2.0 mg/L throughout its length of five (5) kilometres.
   Figure 1 shows the landfill in relation to the wastewater treatment plant and the proposed park. Without
   treatment, the leachate discharges into the same tributary being used for the effluent from the
   wastewater treatment plant.
   The current conditions of your city’s wastewater treatment plant are given in Table 1. It includes the
   population of your city, the size of the aerator and the sludge retention time (SRT) being used. The daily
   per capita wastewater generation is 350 litres, and its soluble BOD5 is 225 mg/L.
   The landfill leachate, which discharges at a rate of 2000 m3
   /day, has a BOD5 concentration of 250 mg/L.
   Table 2 provides further information on the parameters that had been used for establishing operating
   conditions.
   Table 3 provides information on the physical setting of City Park River
   Table 4 contains information on the water quality.
   Table 5 shows how the saturation concentration of oxygen changes with temperature.
   Assignment
   The city wishes that you indicate the location as close as possible to the landfill under the two options of
   (i) direct discharge of the leachate into City Park River; and (ii) treatment of the leachate in the
   wastewater treatment plant.
   You are to do the following:
4. Find the effluent quality from the plant and the operating conditions of the plant to produce it,
   when no leachate is being treated.
5. Then find the best location for siting the park.
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6. Find the modifications required in your wastewater treatment plant to ensure that the effluent
   quality remains the same when the landfill leachate is being treated.
7. Then find the best location for siting the park.
   SUBMIT A REPORT THAT:
8. States clearly your city’s population and the current conditions for its wastewater treatment
   plant. (4%)
9. In tabular form shows the following for both operating conditions of the wastewater treatment
   plant: (12%)
   a. Influent flow and concentration
   b. Soluble, particulate and total BOD5 in the effluent
   c. The MLVSS to achieve the required effluent
   d. The sludge production
   e. The air required for producing the effluent