Estimate nitrate and CO2 removal in a lake, if P removal from euphotic zone is observed to be 6 µg/L during the month of April. What is the rate of algae/ phytoplankton biomass production?
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- The carbon dioxide from the combustion of 1.50 grams of C2H6 is collected over water at 25 degrees Celsius. The pressure of CO2 in the collection flask is 746 mm Hg, and the volume is 2000.00 mL. How much of the CO2 formed apparently dissolved in the water of the pneumatic trough?A water contains 50.40 mg · L−1 as CaCO3 of carbon dioxide, 190.00 mg · L−1 as CaCO3 of Ca2+ and 55.00 mg · L−1 as CaCO3 of Mg2+. All of the hardness is carbonate hardness. Using the stoichiometry of the lime soda ash softening equations, what is the daily sludge production (in dry weight, kg · day−1) if the plant treats water at a rate of 2.935 m3 · s−1? Assume that the effluent water contains no carbon dioxide, 30.0 mg · L−1 as CaCO3 of Ca2+ and 10.0 mg · L−1 as CaCO3 of Mg2+. Be sure to calculate the mass of CaCO3 and Mg(OH)2 sludge produced each day.Suppose the rate of evaporation in a hot, dry region is about 2m per year, and the seawater there has a salinity of 35 ppt. Assuming 90% yield, how much salt (NaCl) can be harvasted each year from 1 km2 of solar evaporation ponds? (The concentration of Sodium in seawater is 480.61 mM)
- An aquifer contaminated with petroleum is found to have the following component concentrations at a particular site: benzene 158 ppm toluene 124 ppm ethylbenzene 91 ppm xylene 45 ppm n-heptadecane 161 ppm pristane 84 ppm Provide an estimate for the age of the spill at this site using (a) BTEX ratio and (b) nC17:Pr ratio. Show your calculations and use units throughout. Give proper s.f. for the answer.How to you calculate the hazard quotient for lead and naphthalene? Please provide examples.At 0°C and 1 bar, a monolayer of CO adsorbed on 1 g of Fe/Al2O3 catalyst occupies a volume of 4.25 cm3. What is the area of the catalyst? The area per adsorbed particle is 0.165 nm2. Give your answer in m2.
- Chemistry An aquifer contaminated with petroleum is found to have the following component concentrations at a particular site: benzene158 ppm toluene124 ppm ethylbenzene91 ppm xylene45 ppm n-heptadecane161 ppm pristane 84 ppm Provide an estimate for the age of the spill at this site using (a) BTEX ratio and (b) nC17:Pr ratio. Show your calculations and use units throughout. Give proper s.f. for the answer.Calculate volume and weight of sludge generated in thickener by chemical coagulation.Data given as:Wastewater flow: 10000 m3/dInlet concentration: 1100 mg/LFeCl3 added: 500 mg/LCaO added: 400 mg/LOverall particle removal efficiency: 80%Sludge’s specific gravity: 1.05Sludge’s moisture content: 95%Assume STANDARD chemical reactions and their product’s behavior as:FeCl3 + H2O → Fe(OH)3CaO + H2O → Ca(OH)21) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500. Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).
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