what is the influent biodegradable chemical oxygen demand?
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what is the influent biodegradable chemical oxygen demand?
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- What is biochemical oxygen demand (BOD) test? At what stage of Sewage treatment this test is performed? BOD level of three samples of water labelled as A, B and C are 30 mg/L, 10mg/L and 500 mg/L respectively. Which sample of water is most polluted?Explain this example of the following water quality serial dilution. Note the dilution factors and how you would calculate #’s from the incubated plates. ……A serial dilution yielded TNTC in the 1:1 plate and the 1:10 plate, 10 cfu’s in the 1:100 plate and 1 cfu’s in the 1:1000 plate .vSludge that has been completely combined with water is recycled activated sludge.What are the system's operational issues?
- I just did an acute toxicity experiment using treated and non-treated effluents with daphnia magna and my mortality rate was higher in the treated effluent. My question is why is treated pulp effluent more harmful than non-treated pulp effluent on daphnia magna? If possible please provide links for references, this is not an easy topic to find.For a microbial cell to grow at its maximum specific growth rate, which of the following conditions shall be matched? O S = (1/2)Ks O S = Ks O S >> Ks OS <a) Define 'Disinfection' and 'Sterilization' OR differentiate between them. b) Enlist the different methods of 'Disinfection' which method would you recommend for 'Municipal Water Supply' and WHY? Depending on the availability of 'Source of Water which 'Source' is more important than the other for disinfection and WHY? Give reason. c) of them is stronger than the other and by what percentage? Define or differentiate between “Free Available Chlorine" and “Combined Available Chlorine". Write their Chemical Formulae and mention which one d) Define “Break Point Chlorination". With the help of a neat Figure' show the "Break Point" and also show "Combined Available Chlorine", "Free Available Chlorine" and "Total Available Chlorine". Mention the “Dosage" in order to obtain a “Free Available Chlorine Residual" of about 0.5 mg/l or above. e) Define the term “Chlorine Demand" of water. What are the "Factors" OR enlist the "Factors" that show the "Effectiveness of Chlorine".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 destructionConsider the sterilization of a sodium gluconate production medium in the holding section of a continuous sterilizer. Assuming constant temperature, the specific death rate constant of the contaminant is 20 s-1 . If the average residence time in the holding section is 10 seconds, calculate the Del factor for the following and explain the results. i. For Pe = 400 ii. For Pe = 400, assuming plug flow iii. For Pe = 100 iv. For Pe = 100, assuming plug flowSuspend 28.0 grams in the 1000 mL distilled water. Heat to boiling to dissolve the medium completely. Sterilize by autoclaving at 15 lbs pressure (1210C) for 15 minutes. Cool to 45-500C. If desired the medium can be enriched with 5-10% blood or other biological fluids. Mix well and pour into sterile Petri dishes. 1. Determine the amount of dehydrated medium needed to prepare 50 nutrient agar plates. Include amount for 2 additional plates as excess to compensate for compounding losses.Serial dilution = previous dilution x dilution 11 mL [2] 3 mL Colony count: 100 0.1 mL sample [1] 9.9 mL 5 mL 0.1 ml. Cokony count Dilution: 10-1 10-3 [3] 150 Dilution factor (DF): [4] [5] [6] Compute for the CFU/mL of the sample. Show your solution and express your final answer to 2 significant figures.Which of the following statements regarding low temperature storage is FALSE? Question options: freezing inhibits microbes through the unavailability of water freezing causes microbial death largely through DNA denaturation all of these statements are TRUE refrigeration functions largely by reducing the metabolic rate of microbes psychrophiles are generally not effectively inhibited by refrigeration many bacteria can survive freezing for years at a timeA water sample was taken from the Waikato River and returned to the laboratory to analyse water quality parameters. If the agar plate CFU number counting method is used, we can only expect 0.1 - 10% of the containing microbial species can form colonies on the agar plates. True FalseSEE MORE QUESTIONS