When a thermocline develops in a temperate freshwater pond, the oxygen availability at the bottom of the pond _______ incerese decrease or nothing happens?
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When a thermocline develops in a temperate freshwater pond, the oxygen availability at the bottom of the pond _______
incerese decrease or nothing happens?
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- An activated sludge plant (CSTR w/ recycle) has the following characteristics: Influent substrate concentration, So = 400 mg/L BODL (all soluble); influent VSS, Xyº = 0; effluent 3 substrate concentration, S = 10 mg/L BODL; flow rate, Q = 1000 m³/day; aeration basin 3 volume, V = 200 m³; reactor MLVSS, Xv = 4,280 mg/L; average, steady-state oxygen uptake rate, Oxygen uptake rate (OUR) = 0.3 mg 02/L-min. The biomass viability (i.e., v = Xa/Xv) was measured using the oxygen uptake rate (OUR) technique and found equal to 0.926. An aliquot of mixed liquor was placed in a small reactor, aerated without any exogenous substrate addition (i.e., starvation conditions) and it's OUR was measured over time resulting in the following data: 0 1 2 3 4 5 Time (days) OUR (mg 02/L-min) 0.3 0.274 0.243| 0.222 0.203 0.182 6 8 10 0.165 0.135 0.110 By use of the above data, the microorganism decay coefficient (b, day can be estimated if you assume that a constant relationship exists between Xa and OUR,…Ted heats some food just to boiling, and stores some of it immediately in a container which he places in the refrigerator. A week later he takes the food out and finds it has spoiled. The microbes that spoiled the food are probably ________ organisms. thermophilic hyperthermophilic mesophilic psychrophilic. thermoduricLining a nest with warm insulating materials is an example of __________________________ thermogenesis
- Which of the following statements regarding low temperature storage is FALSE? Question options: all of these statements are TRUE refigeration inhibits microbes through the unavailability of water low temperature storage the metabolic rate of microbes many bacteria can survive freezing for years at a time psychrophiles are generally not effectively inhibited by refrigeration freezing causes microbial death through membrane destructionThe five most important green house gases in terms of quantity are carbondioxide,methane,sulphur dioxide ,nitroxides and chloro fluoro carbonates. True or falsePlease answer this question Define Anaerobic threshold
- Source: http://www.hrrsa.org/tours/virtual-tour Questions refer to the treatment of the liquid waste water. Where does the liquid water go after separation? Define “aerobic”, “anaerobic” and “anoxic.” How does the plant get biological organisms into the reactors?Source: http://www.hrrsa.org/tours/virtual-tour Questions refer to the treatment of the liquid waste water. What do these organisms remove from the water? How does temperature affect the activity of these microorganisms? When the water leaves the biological reactor, where does it go?(A) if both sentences are true, (B) if both sentences are false, (C) if the first sentence is true but the second is false, and (D) if the first sentence is false but the second is true. 1.Insufficient dissolved oxygen is necessary for the life of fish and other aquatic organisms. As aquatic photosynthesis is light dependent, the dissolved oxygen produced will peak during daylight hours and decline at night. 2. The potability or “drinkability” of tap water varies from place to place. The distillation process ensures that contaminants are left in the boiling vessel, which results in a cleaner and more pure water in the collection vessel. 3. The stable form of oxygen in the Winkler Titration Method in determining the dissolved oxygen in water was magnesium dioxide. The free iodine in the Winkler Titration Method turned the solution into a red color. 4. Tap water is more pure than distilled water. The purity and cleanliness of distilled water remains constant no matter where you get it…