A water contains 3.5 mg/L of ferrous iron (Fe2+), 0.3 mg/L of manganese (Mn2+), and 0.7 mg/L of ammonia (NH3-N). If a free residual chlorine of 0.3 mg/L is needed after disinfection of this water, then the required chlorine dose (in mg/L) to disinfect this water is:
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- You are treating 10 million gallons per day (MGD) of water with alum at a dosage of 50.0 mg/L. Alum is available as a hydrated salt Al2(SO4)3.16H2O. Determine:(a) The monthly alum dosage required in metric tons/month (1 metric ton = 1000 kg)(b) If you assume that each equivalent of alum added to the water consumes 1 equivalent of alkalinity, determine the alkalinity consumed by alum addition in milliequivalents/L (meq/L)(c) Given that the raw water contained 30 mg/L as CaCO3 of alkalinity, is the alkalinity sufficient? What would happen if the alkalinity is inadequate?A water contains 100.0 mg/L CO2-3 and 75.0 mg/L HCO-3 at a pH of 10 (T =25C). Calculate the exact alkalinity. Approximate the alkalinity by ignoring the appropriate chemical species. Select one: a. 167 mg/L b. 233 mg/L c. 459 mg/L d. 385 mg/LCalculate 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.
- You are asked to design a disinfection process using chloramine as your disinfection agent. The influent concentration of giardia is 1000 organisms per 100 ml. The USEPA regulation requires a 3 log reduction in giardia concentration in the disinfection process. The chlorine contact tank is 30 meters long and has a cross section area of 10 square meters and the flowrate is 150 cubic meters per hour and can be modeled as a plug flow reactor. The Ct value that needed is 1100 mg/L min. It is important to know that the chloramine concentration breaks down over time due environmental factors that are beyond your control. The decay is a first order process and has a decay coefficient of 0.1 hr-1. What is the effluent giardia concentration? In order to ensure disinfection occurs we often use the effluent concentration in our Ct calculation, what is the effluent concentration of chloramine? Given the decay behavior of chloramine described above, what concentration of chloramine should I dose…Environmental Engineering: A lake with a constant volume of 10*106 m3 is fed by a pollution-free stream with a flow rate of 50m3/s. A factory dumps 5m3/s of a nonconservative waste with a concentration of 100mg/L into the lake. The pollutant has a reaction coefficient rate, k, of 0.25/day. Assuming the pollutant is well mixed in the lake, find the steady state concentration of the pollutant in the lake.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/L
- You place a 20 g sample of solid waste in a drying oven overnight and find the mass in the morning (after the moisture has been evaporated) to be 16.2 g. A 1 g (wet) sample is also placed in a 1L water jacket bomb calorimeter and 0.18 g of ash remains in the sample cup after combustion. The temperature in the calorimeter is raised by 2.17 ˚C. Calculate the heat value on a wet weight basis, dry weight basis, and on a moisture and ash-free basis. Convert your values to BTU/lbA rapidly mixed tank consists of a treatment unit used to disinfect a solution. The solution enters the 2000 m3 tank at a rate of 0.4 m3/s. The pollutant contains 7.94 CFU per liter and has no 0 mg/l of chlorine. The treatment unit uses a stock solution containing 750 mg/L which is released a rate that will cause the chlorine concentration in the tank to be 2 mg/L. The chlorine reacts with the water in such a way that it is depleted at a rate (in mg/L-h) given by rcl = ( -0.45 / h) CCl. When exposed to chlorine, the bacteria die off at a rate (in cells/L-s) given by:a) Calculate the required flow rate in L/s of the stock solution when the system is operating at steady state, including a schematic of the system.b) Determine the bacterial concentration (in CFU/L) thar should be expected in the effluent from the tank?Sea 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.
- Chloroform, CHCl3 a volatile liquid, was once used as an anesthetic but has been replaced by safer compounds. Chloroform boils at 61.7°C and has a heat of vaporization of 31.4 kJ/mol. What is its vapor pressure at 37.2°C?A water treatment plant is being designed to process 50000m3/day of water. Jar testing indicate that an alum dosage of 40mg/l with flocculation at a Gt value of 2×104 produces optimal results at the expected water temperature of 150c . Determine: ØThe monthly alum requirement for the treatment plant ØVolume of the flocculation basin. ØThe power requirement ØProjected area of paddle blades [Take absolute viscosity at 150c to be 1.139 ×10-3 Ns/m2 (Assume Vp 0.5m/s, CD 1.8) ]Calculate the percent volatility of the solids given that an empty container weighs 15.7g. A sample from the aeration tank is put in the container. At temperature 104 degC , the container now weighs 21.2211g. It was further heated in a furnace with a temperature of 540degC and gained a constant weight of 20.5057.