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- The plant operators at the Acme WWTP maintains the 10,000 gal aeration basin shown below with a constant 1500mg/L mixed liquor suspended solids (MLSS). The suspended solids are separated in a clarifier with recycle of the separated sludge. The recycle flow rate is 5,000 gal per day and 500 gal of recycle are wasted daily. Given that the plant treats 25,000 gals of liquid waste per day and the effluent contains 30 mg/L MLSS, find the solids retention time assuming the system is at steady-state.Environmental Engineering question: A drinking water treatment facility is planning to reduce operation cost and residence time for one of the reactors in the treatment plant. What type of rectors will you recommend and why? a. Batch reactor b. Plug flow reactor c. Continuously stirred tank reactorA BOD test is run using 100mL of treated wastewater. The initial DO of the mixture after diluting the waste sample with distilled water is 9.0mg/L. After 5-day incubation, the DO measured was 4.0mg/L. After a long period of time, the DO is 2.0mg/L and no longer seems to be decreasing. Assume that nitrification has been inhibited. Determine the following: a)BOD5 & BODu of the waste sample b) BOD5 of the mixture and c) k THANK YOU
- A coagulation treatment plant with a flowrate of 0.05 m3/s doses with ferric sulfate at 20.0 mg/L. No other chemicals are added. The raw water suspended solids concentration is 36 mg/L. The effluent suspended solids concentration is 1.0 mg/L. The sludge solids content is 1.05%. The specific gravity of the sludge solids is 2.5. What volume of sludge is produced each day?Wastewater from a primary treatment tank is to undergo secondary treatment in an activated sludge unit. The following data and operational parameters are specified: Hydraulic detention time= 6h Mean cell residence time= 7days BOD content at inlet of reactor = 150 mg/L Food to microorganism ratio=0.3gm BOD/gm VSS-day Two identical units are designed to operate in parallel and to process a combined wastewater flowrate of 0.7m3/s. How large must each reactor be (m3)? What is the rate at which cell mass must be discharged from the units in steady state operation (kg/day)?A jar test reveals that the optimum alum coagulant dose is 50 mg/L at a pH of 8.1 and a temperature of 73 F. How many pounds per day of 49% alum are required for the whole plant? Total flow is 36 MGD with four parallel treatment plants, each designed for 12 MGD. Could use some guidance on setting up the equations.
- The results of a jar test on a surface water supply sample revealed that the optimum dose of alum (Al2(SO4)3.14H2O) as coagulant is 17 mg/L. Furthermore, the water has total alkalinity = 50 mg/L as CaCO3; pH = 7.8; and residual turbidity at optimum alum dose = 4 NTU. The water treatment plant has a mean flow of 10m3/hour. Determine: The kg of alum per year needed in the operation of the plant. The residual alkalinity in the sample, following the addition of alum at optimum dose. Solve parts (a) and (b) if instead of alum, ferric chloride (FeCl3) were used as coagulant. Assume the numerical jar test results are the same as those with alum.A wastewater treatment plant has been operating with the following specifications:flow rate = 7,630 m3/d, aeration tank volume = 1,270 m3, mixed liquor volatile suspendedsolids = 2,600 mg/l. The soluble BOD in the plant influent used to be 133 mg/l, but hasrecently changed to 222 mg/l. What is the new MLVSS this plant should use to maintain thesame F/M ratio as before? (Ans. Xnew = 4,340 mg MLVSS/l)Q: What precautions should we follow when conducting experiments in the Environmental lab? How can you determine chloride content in a wastewater sample? subject: Environmental Engineering-ll (lab) program: BE-Civil Engineering
- A municipal waste water has a BOD5 of 200 mg/L at 20 ˚C. The reaction rate constant k at 20 ˚C is 0.23 day-1.[5] a. calculate the ultimate CBOD.[5] b. calculate BOD5 at 15 ˚C.You have been treating a wastewater with bacteria that have the following kinetic coefficients: k= 16 mg BODL/mg VSS-day Ks = 10 mg BODL /l b =0.2/day Y = 0.35 mg VSS/mg BODL fd = 0.8A genetic engineer comes to you and claims he can “fix” your bacteria so they are more efficient. The fixed bacteria will have b=0.05/day and fd = 0.95, while all other coefficients are the same. Using a chemostat reactor, you were successfully using a safety factor of 30, and you plant to continue doing so. How would the genetic engineers plan affect your sludge production and oxygen requirements? Assume X0=0, S0=200 mg BODL/l). In what ways are the new bacteria more efficient?(a) Explain the advantages of a membrane bioreactor (MBR) system in advanced wastewater treatment. If a typical activated sludge treatment works is retrofitted to incorporate an MBR process, explain how wastewater and sludge treatment lines in the treatment works need to be modified. (b) Calculate how much additional aeration unit volume is required to upgrade a BOD removal activated sludge plant under the following conditions: I. Good nitrification performance by increase in Solids Retention Time (SRT). II. 80 % increase in SRT (Solids Retention Time) is achieved by 40 % reduction in sludge waste flow rate. III. Mixed Liquor Suspended Solids (MLSS) concentration in aeration unit and settled solids concentration is unchanged.