Answer Happy

l need help with question 2 in this assissment any help would be
great I really need the help
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: (0) to allow the leachate to discharge into the river where the park will be (11) 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 BODs is 225 mg/L. The landfill leachate, which discharges at a rate of 2000 m/day, has a BOD: concentration of 250 mg/L. 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 BODs is 225 mg/L. The landfill leachate, which discharges at a rate of 2000 m/day, has a BODs 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.
SUBMIT A REPORT THAT: 1. States clearly your city's population and the current conditions for its wastewater treatment plant. (4%) 2. Intabular form shows the following for both operating conditions of the wastewater treatment plant: (12%) a. Influent flow and concentration b. Soluble, particulate and total BOD, in the effluent c The MLVSS to achieve the required effluent d. The sludge production e. The air required for producing the effluent f. Explains the calculations to obtain the effluent quality and the operating conditions 3. Shows a sample calculation with all details for obtaining the quantities above. (24%) 4. Shows, using a graph, how the Do varies along City Park River, from the effluent tributary to 40 km downstream (15%) 5. Shows a sample calculation with all details for obtaining the critical points on the graph (20%) 6. Gives clear advice to the city on: a. Where is the closest location for the park (5%) b. Implications on the activated sludge by having the leachate treated at the wastewater treatment plant 15%) A qualitative discussion on the consequences of climate change on water quality within the park. (10%) Graphical 7. CLEARLY STATES ANY ASSUMPTIONS NECESSARY IN COMPLETING YOUR REPOR Descriptio For questioni • the city's population is 65000 its wastewater treatment plant has an aerator volume of 6000 m • its 5RT IS 7.0 days. Table 2. Information on the wastewater treatment Values for the coefficients: Half saturation constant, ki 125 mg/L Decay coefficient, ke 0.1 d Maximum specific growth rate : 2.40 Yield coefficient, 0.5 mg VSS/1.0 mg BOD. Secondary clarifier: Solids concentration in its effluent: Biodegradable fraction, f.: 20.0 mg/ 0.63 Aeration System: Oxygen transfer efficiency. Density of air: Oxygen in air: 8% 1.185 kg/m 23.8%by mass
Location BOD (mg/L) DO (mg/L) K. (d) at K(d) at 20°C 20°C deos Orcarat WW WWTP TBD 2.2 0.35 1.056 Just upstream of the plant along City Park River 6.0 6.0 0.41 0.39 1.056 1.024 250 2.5 0.35 1.056 Landfill leachate TBD, To Be Determined The variation of saturation concentration of oxygen with temperature is given in Table 5. Table 5 Saturation concentration of Oxygen in water. TCC) 20 21 22 23 24 25 26 27 28 29 30 DO. (rg/L). 9.2 9.0 8.7 8.5 8.4 9.2 8.1 7.9 7.8 7.6 Proposed pipe for leachate treatment closest possible location of park to the landfill WWTP Landfill City Park River 20km Figure 1
FORMULA SHEET WATER QUALITY CONTROL Streeter-Phelps equation: kalo 16-kat - e-kert ek')+D + D - k, – ka k! kr - kall tc 1-D. do) 1 In it d ka, deoxygenation rate constant, (d1); D, oxygen deficit in river after exertion of BOD for time, t, (mg/L); time of travel of wastewater discharge downstream, (d); Lo, initial ultimate BOD after mixing, (mg/L); Do, initial deficit after mixing, (mg/L). kr, reaeration rate constant, (d-1); to time to the critical point of maximum DO deficit Reaction rate adjustment for temperature: k = kant I is 1.056 for the deoxygenation constant and 1.024 for the reaeration constant. O'Connor and Dobbins reaeration equation for k, at 20°C: 3.9*** k, = H15 where v, mean stream velocity, (m/s); H, mean depth of stream, (m) =
Y = ACTIVATED SLUDGE PROCESS 0.QY(S. -S) V(1+k.) K. (1+k.0.) == Y ( 1+k, U X, mixed liquor volatile suspended solids concentration sludge (inert and volatile) (mg/4 (mg/L); SQ, S BODs in the influent and the effluent, respectively Ks half saturation constant (mg/L); (mg/L); Yes. Y observed and true yield coefficients respectively, Mo,mass of oxygen (kg/d) (mg VSS/mg BOD) un maximum specific growth rate (d1); Px daily sludge produced (kg/d); solids retention time(d); f, ratio of BODs to BOD. SVI, sludge volume index (ml/g); k. endogenous decay rate constant (d);