A desalination plant produces 10,000 m3/day of brine with concentration of 80 g (gram)/L. This brine will be thrown into the ocean. But the concentration has to be lowered to 60 dS/m. How much seawater should be mixed with the brine if the seawater has a salinity of 3%.? Calculate how much salt is in the brine in Tons/day.
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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.How much water must be removed from an unconfined aquifer to lower the water table 2 feet. In your research, you located a past study which determined the aquifer has a specific yield of 0.22. Assume the water is incompressible and the porosity does not change.How much dissolved oxygen (mg/L) is present in 27°C freshwater?
- What is the ratio of potassium concentration to salinity in a sea water sample, given that potassium is 0.038‰ and overall total salinity is 34.482‰?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/lDetermine 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 Celcius
- An urban sludge basin has a volume of 500 m3. The basin is initially 64% full. The sludge with a density of 1320 kg/m3 is taken away from the basin at a rate of 4 ton/day. How long will the basin take to be fully emptied? Assume the basin is now initially full and re-estimate the time to empty it completelySea 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)?
- If the chlorine demand for a water is 3.0 mg/L, and the breakpoint is at 3.0 mg/L, what would the amount of chlorine that would need to be added in (in mg/L) if you desired to have a free chlorine residual of 2.0 mg/L in the water?Suppose 1 m3 of an aquifer is contaminated with toluene.Groundwater moves through at an actual speed of 0.03 m/day and the toluene has a dissolved concentration equal to 20% of its solubility.How long will pump and treat take (in years) to remove the toluene spill?Toluene Conc. 4 LPorosity: 30%if temperature of a water sample is 20C and salinity is 30 ppt, what is the max concentration of dissolved oxygen?