How much dissolved oxygen (mg/L) is present in 27°C freshwater?
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- Calculate dissolved oxygen concentrations at 0 and 25 degrees using Henry's formula.Calculate the pH and alkalinity (in mol/L) of a water that contains 120.0 mg/L of bicarbonate ion and 15.00 mg/L of carbonate ion.What are sources, sinks, and environmental factors affecting Dissolved Oxygen in bodies of water?
- Water is taken from a river to cool a power plant. The water accepts waste heat and is returned water back to the river. The return water has a flow rate of 200 gal/min, and the receiving river has a flow rate of 3,000 gal/min and a temperature of 18 degrees C in the summer at the point of mixing. If the maximum allowable temperature of the river after mixing is 22 degrees C before the fish die, what is the maximum allowable temperature of the return water?The volume of ocean water is 1338x10^6 km^3. The runoff from rivers is 44.7x10^3 km^3/year and the runoff from groundwater is 2.2x10^3 km^3/year. The precipitation on the ocean is 1270mm/year (The ocean area is 361.3x10^6 km^2). Estimate the residence time of water molecules in the ocean (in years).Water quality and characteristics discuss: Organoleptic parameters
- The volume of atmospheric water is 12669km3. The evapotranspiration from land is 7200 km3 per month and from ocean is 505000 km3 per year. Estimate the residence time of water molecules in the atmosphere in a month.Can someone please help me out with this hydrology question? Thank you A 10 g mouse (dry weight) is accidentally bottled in a 25 litre jug of spring water that initially contains 10 mg/L of oxygen. Assume that 70% of the dry weight of the mouse is carbohydrate (CH20). Write the relevant equation for oxygen consumption. Does the jug become anaerobic? If 2 ppm nitrate and 15 ppm sulphate are also in the jug, how much nitrate and sulphate will be left in the jug when it comes to equilibrium?What volume of water is contained in one cubic meter of material if the porosity is 20% and the saturation expressed as a fraction of the pore space is 30% ?
- A city wishes to discharge wastewater primary effluent to a river which supports a trout. The state requires the city to show that the trout population is protected. Trout require a minimum of 4 mg/l of dissolved oxygen to survive. Determine the minimum downstream dissolved oxygen concentration from the following information about the wastewater discharge and river. Does the minimum dissolved oxygen concentration meet the requirements? Wastewater discharge=0.45m3/s, river flow rate= 8.5 m3/s, river cross-sectional area=19m2, dissolved Oxygen concentration in the wastewater= 0.2mg/l, dissolved oxygen content of the river upstream = 8.1mg/l, saturation dissolved oxygen concentration at 20 C= 9.0 mg/l, BOD concentration in wastewater = 85 mg/l, BOD concentration upstream in the river= 0.2 mg/l, BOD decay constant = 0.2 d-1, and the reaeration constant for the river= 0.4 d-1.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.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/l