The treated waste water is being discharged into a river that has a temperature of 15°C. The BOD rate constant determined in the laboratory for this mixed water is 0.12 per day (base e) at 20°C (Temperature coefficient, 1.047). What fraction of maximum oxygen consumption will occur in first four days?
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- Calculate the exact alkalinity (in mg/L as CaCO3) of a water containing 120.0 mg/L of bicarbonate ion and 15.00 mg/L of carbonate ion. The water has a pH of 9.4.In a biological wastewater treatment system, which of the following conditions could beconsidered as an anoxic condition: ( )(A) [Dissolved Oxygen] = 3.5 mg/L and [Ammonia-N] = 10 mg/L;(B) [Dissolved Oxygen] = 0.3 mg/L and [Nitrate-N] = 15 mg/L;(C) [Dissolved Oxygen] = 0.05 mg/L and [Nitrate-N] = 0.1 mg/L;(D) [Dissolved Oxygen] < 0.05 mg/L and [Ammonia-N] = 10 mg/LCalculate "exact" alkalinity of the water containing 130 mg/L of bicarbonate ion, 25.00 mg/L of carbonate ion and the pH is 9.3
- Determine the exact and approximate alkalinity of a water sample that contains 120.0 mg/L of (CO3)^2- and 75.0 mg/L of (HCO3)^- at a pH of 9.7 at 25 degrees CelciusSea water can be desalinated by using reverse osmosis. A plant treats 4,000 m3 /day of feedwater containing 27,000 ppm of salinity. The product salinity is 300 ppm. What is theproduct recovery (desalinated water) based on the volume of the feed? The salinity of thebrine output is 52,000 ppm.A city of 20,000 people disposes of 1.05 m3/s of treated sewage that still has an ultimate BOD of 28.0 mg/L and 1.8 mg/L DO into a river. Upstream from the outfall, the river has a flow rate of 7.08 m3/s and a velocity of 0.37 m/s. At this point, the ultimate BOD and the DO in the river are 3.6 and 7.6 mg/L, respectively. The saturation value of DO (at the temperature of the river) is 8.5 mg/L. The deoxygenation coefficient is 0.61/day, and the reaeration coefficient is 0.76/day. Assume complete mixing and the velocity in the river is the same upstream and downstream of the outfall. What is the oxygen deficit and the ultimate BOD just downstream from the outfall (just after mixing, before any reaction can occur)?
- The flow of a river is 1.5 m3/s, the river is polluted with the pesticide permethrin and flows into a lake (100 m x 100 m 2.5 m) 25000m3. Steady state concentration of permethrin leaving the lake is 1.4 ppm and the average cross-sectional area of the river is 2.7 m2. The half-life of permethrin in this environment is 19 hrs.A bottle is filled with river water. The initial dissolved oxygen concentration is 10.2 mg/L. After 5 days the dissolved oxygen concentration is 3.0 mg/L. Calculate the BOD 5. in mg/lA wastewater contains 0.2 M pyruvate. Estimate the volume of methane in liters (STP) that would be produced per liter of wastewater from anaerobic treatment in a CSTR with a detention time of 15 d, assuming an efficiency of wastewater treatment of 97%. In order to solve this problem use thermodynamics to estimate f9 with an energy transfer efficiency of 60%, and assume the organism decay rate is 0.08 d'. Please correct answer otherwise dislike
- A thermal oxidizer incinerator operates as a plug flow reactor at a temperature of 250 deg C. The first order rate constant for vinyl chloride removal is 45/sec at 250 degrees C and the inside diameter of the incinerator (which is shaped like a cylinder) is 1 m. (a) If the pollutant (Vinyl chloride) enters the incinerator at a flow rate of 3,000 m3/min and it is desired to remove 99.99% of the pollutant, what should the length of the incinerator be? (b) What is the length of the incinerator if the desired removal is increased to 99.99995%?A trickling filter with a volume of 250 m3 is used to treat wastewater with flowrate 30,000 m3/d and BOD5 of 130 mg/L. The OLR in peak conditions is 1.6 times that of average conditions. Calculate the required oxygen supply per unit mass of BOD.A stream containing no biochemical O2 demand (obviously a hypothetical situation) has a DO of 5.00 mg/L and a flow rate of 8.70 m3/s. The temperature of the stream is 15 degrees Celsius. The average velocity in the stream is 0.174 m/s. The average depth is 5 m. Determine the reaeration coefficient and the rate of reaeration.