Concentration of Oxygen in Water Temperature (°C) Oxygen Concentration in Freshwater (ppm) Oxygen Concentration in Seawater (ppm) 1 14.0 11.0 10 11.5 9.0 15 10.0 8.0 20 9.0 7.5 25 8.0 7.0 30 7.5 6.0
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- Under anoxic conditions, biological denitrification of waste water by activated sludge results in the conversion of nitrate to nitrogen gas. Sludge is microorganisms, and these microorganisms carry out this reaction, this is a biological reaction. When acetic acid provides the carbon source, the reaction can be represented as follows: 5CH3COOH + 8NO3 → 4N2+ 10CO2 + 6H20 + 8HO Acetic acid Nitrate a) Is the stoichiometric equation balanced? write down the number of atoms of each species on left side and also on the right side of this equation. b) In the absence of side reactions, what is the yield of nitrogen from acetic acid in g g1? c) A certain waste water contains 6.0 mM acetic acid and 7mM NaNO3. If 25% of the acetic acid and 15% of the nitrate (NO3) are consumed in other reactions (e.g, for growth of the microorganisms in the sludge), which is the limiting substrate in the denitrification reaction? d) For the situation described in part c), what mass of gaseous nitrogen (N2) in…Using supporting calculations, determine the energy and cost (carbon) savingsassociated with the following biological nitrogen removal strategy: Partial nitrification (oxidation of all the influent ammonia to nitrite) and partialdenitrification (reduction of produced nitrite to nitrogen gas)Plants absorb several ions and water from soil. For this reason, it is necessary for the soil to have a pH value at the range of 6.0 – 8.0. Again, if the p4 is less than 3.0 or greater than 10, then the beneficial microbes of the soil die. Normally rainwater is slightly acidic, its p# value is 5.5. During thunderstorm nitrogen and oxygen of air react to form nitric oxide, which is oxidized to form nitrogen-dioxide. This nitrogen-dioxide reacts with water vapor and forms nitrous acid and nitric acid. Acid-rain occurs because of it. 2NO2+ H2O → HNO2+HNO3 Examination of soil in a region of Rajshahi revealed that its p" value was 6.43. Nitrogen-dioxide is formed in the air because of thunderstorms, and its concentration is 0.297 ppm. What will be the difference between the p" value of the soil after rain and the lowest standard pH value ?
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