Problem 2. A continuous-stirred tank reactor (CSTR) activated sludge facility is being designed for a vinegar manufacturer. The design flow to the facility is 4000m3/ day with 400mg acetic acid/liter (CH3COOH, molecular weight (MW)=60). You may assume there are no solids in the influent. A literature search has provided values of b,K and q(=m/Y) as 0.1 day 1,5mg acetic acid/liter and 6mg acetic acid/mg VSS.day. Assume that 0.8 MLSS (mixed liquor suspended solids)=MLVSS (mixed liquor volatile suspended solids, Xv), =0.25 day and x=20 days. If nutrients are required, they will be added as NH4Cl(MW=53.5 ) and H3PO4 ( MW=98, atomic weight of P=31 ). Thermodynamic data (half-reactions) are included in the Tables (5.3,5.4 and 5.5) in the 2nd edition of the textbook or in Tables of Chapter 2 of the 1st edition of the textbook. a.) (20 marks) Write the balanced, overall biological reaction (R) b.) (10 marks) Estimate the yield Yobs (mg active VSS/mg COD). c.) (5 marks) Calculate xmin and the safe factor (=x/xmin2). d.) (10 marks) How much NH4Cl and H3PO4 (the minimum quantities) are required per day? e.) (5 marks) What is the theoretical oxygen demand (kgO2/ day)? f.) (5 marks) What is the MLSS? The following equations may be useful: A=(Gpp/mn+Gp/)/(Gr)where:n=1forGP0,GP=35.10+Gc0kJ/eeqGr=GaO+GaokJ/eeqfs=1/(1+A)fs=fs(1+0.2bx)/(1+bx)R=fsRc+faRs+Rdfa+fs=11/x=Y[qS/(K+S)]bS=K(1+bx)/[x(Yqb)1]Theoreticaloxygendemand(kgOO2/day)=Q(SS)feXV=(x/)[Xv0+Y(S0S)(1+0.2bx)/(1+bx)]Yobs=Y[(1+(1fd)bx)/(1+bx)]U=(1/x+b)/Y