Given the truss with loading shown. Note that the roller connection at Joint D is in atrack so that it cannot move in the x-direction, but it can roll in the y-direction.Solve the truss with the virtual load you would use if you are going to solve for the verticaldeflection at Joint E using the method of virtual work.Note: Just solve the truss. You DO NOT need to find the vertical deflection at Joint E.

Question (1): (18 Marks) Gaza City has a total population of 650,000 inhabitant, where 75% of the population is connected to wastewater collection system. The water consumption per capita is 100 L/day. Currently, the collected flow treated partially by aerated lagoon system. The municipality intend to change the treatment system to a completely mixed activated sludge system to be used for organic matter removal only to fulfill the Palestinian standards for reuse (Soluble BOD 30 mg/l). The given data from the municipality laboratory and assumptions: ⚫ The influent soluble Biological Oxygen demand = 500 mg/l. Biomass yield (Y) = 0.5 mg VSS/mg BOD removed • Endogenous decay rate constant (Ka) = 0.05d¹ • • The concentration of biomass (X) = 3000 mg MLVSS The concentration of recycled biomass (X) = 10000 mg MLVSS/L Growth rate (d) 2.5 1.25 100 For the completely mixed activated sludge system find the following: a) The average flow to the treatment plant. b) The mean cell residence time. c)…

Question (3): (20 Marks) You have been assigned to design a secondary wastewater treatment component based on a tricking filter technique. The flow rate is 3500 m³/day, the raw wastewater has a BOD5 of 600 mg/l. This wastewater is primarily treated with an efficiency of 35%. • Assume suitable design criteria to obtain a BOD effluent of 15 mg/l. Design the secondary clarifier • Perform all the necessary cheeks on your design.