Tetrachloroethylene Biochemical Oxygen Demand problem
Info: BOD: Biochemical Oxygen Demand BOD5 is the total amount of oxygen consumed by microorganisms during the first five days of biodegradation BOD5 = (DOi – Dof)/(P) this is the five-day BOD of a diluted sample Where DOi = the initial dissolved oxygen (DO) of the diluted wastewater DOf = the final DO of ...continues
Calculation of chlorine ions necessary for charge balance in surface water chemical analysis
Data: A chemical analysis of a surface water yields the following data: Ion Concentration mg/L Ca^(2+) 90 Mg^(2+) 30 Na^+ 72 K^+ 6 Cl^- 120 SO4^(2-) 225 HCO3^- 165 pH 7.5 Problem: The Cl^- concentration in the water analysis given has been questioned. What concentration of Cl^- (mg/L) would ma ...continues
Total hardness (TH), anion-cation balance
Calculation of total hardness (TH) and anion-cation balance given total anions.
A reverse osmosis plant desalinates 5x10^6 L/day of feedwater
A reverse osmosis plant desalinates 5x10^6 L/day of feedwater containing 1500mg/L of salts yielding 3x10^6 L/day of product water with 75 mg/L of salt. What would the salt concentration be in the brine?
Determining size needed for settling tank given flow rate and detention time.
6.10) A final settling tank for a 2-million-gallon-per-day (2mgd) activated-sludge treatment plant it to be designed to have an average overflow rate of 800 g/day-ft^2. the tank needs to have a minimum detention time of 2.0 hr and to allow proper settling it must be at least 11 ft deep. If the tank is circular, what should its d ...continues
29) A 200-MW power plant has a 100-m stack with raidus 2.5 m, flue gas exit velocity 13.5 m/s, and gas exit temperature 145 degrees Celsius. Ambient temperature is 15 degrees Celsius, windspeed at the stack is 5 m/s, and the atmosphere is stable, Class E, with a lapse rate of 5 C/km. if it emits 300 g/s of SO2, estimate the conc ...continues
Estimate of NOx concentration given emission volume and wind speed.
36) A freeway has 10,000 vehicles per hour passing a house 200 m away. Each car emits an average of 1.5 g/mi of NOx, and winds are blowing at 2 m/s across the freeway towards the house. Estimate the NOx concentration at the house on a clear summer day near noon (assuming that NOx is chemical stable).
Arrange the elements below into 3 different groups that have similar chemical properties. cesium chlorine magnesium barium potassium lithium bromine sodium fluorine calcium
The gas in a sealed bag of Cheetos...
The gas in a sealed bag of Cheetos™ has a volume of 500 mL in Pueblo where the atmospheric pressure is 600 mm of Hg. You take this bag to the top of Pikes Peak where the pressure is 420 mm of Hg. Assuming the temperature on the Peak is the same as Pueblo (hot day on the Peak!), what is the volume of the gas in the Cheetos™ bag ...continues
Balance this equation: H2(g) + N2(g) --> NH3(g) How many moles of ammonia ( NH3(g)) could be produced from 5 moles of H2(g) and 20 moles of N2(g) ?
