What category of bacteria does tube "B" represent? High oxygen concentration Low oxygen concentration 0250 bar, (a) (b) (c) (d) O obligate aerobes O aerotolerant O facultative anaerobes O obligate anerobes
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- Effluent from an industry 'A' has a pH of 4.2. The effluent from another industry 'B' has double the hydroxyl (OH-) ion concentration than the effluent from industry 'A'. pH of effluent from the industry '8' will beQuestion 90/100 A trapezoidal section has a bottom width of 20 ft and side slope of inclination 1:1.5. Its friction factor f = 0.056. The depth of the channel is 4.0 ft. The channel slope is 0.025.Use C = √(8g/f) Compute the flowrate in cu.ft/s 1937 1370 2373 2062You are being consulted for the design of a coagulation-flocculation basin for a water treatment plant. Ferric sulfate is available as a commercial coagulant and is popular at removing turbidity and color. The chemical reaction for its addition to water is: Fe2(SO4)3 + 3Ca(HCO3)2 ----> 2Fe(OH)3 (s) + 3CaSO4 + 6CO2Results of a jar test to determine the optimal coagulant dose are provided below. The initial water sample has a pH=6.5 and turbidity of 30 NTU. Ferric sulfate dose, mg/L: 5 10 15 20 25Turbudity, NTU: 15 5 1 0.9 2What is the optimal mass of ferric sulfate you would need to purchase every day to treat 106 gallons/day to a turbidity below 1 NTU (assume 100% purity of the coagulant).
- For a solution containing 200 mg/L of glycine [CH2(NH2)COOH] whose oxidation can be represented as 2CH2(NH2)COOH + 3O2 --> 4CO2 + 2H2O + 2NH3NH3 + 2O2 --> NO3- + H+ + H2O(a) Find the theoretical CBOD.(b) Find the nitrogenous portion of BOD (BOD only due to oxidation of N compounds). (c) Find the total theoretical BOD.The second stage nitrification process is :presented by the following equation Nitrobacter 2NO2+ 02 -> 2NO3 Give the value of Oxygen Required for this ?stage in Ib / IbN oxidized إختر أحد الخيارات 4.57 .a O 1.0 .b O 1.14 .c O 3.43 .d OProvide relevant infomation about the constituents of OPC in the blank cells of the following uble Specific gravity Peroent by weight Rate of S.N Constituent Desity Role Size hydration Tricalcium aluminate Tetracalcium 2 aluminoferite 3 Helite 4 Alite Gypum
- ENVIRONMENTAL ENGINEERING: WATER POLLUTION For a solution containing 200 mg of glycine [CH2(NH2)COOH] whose oxidation can be represented as: 2 CH2(NH2)COOH + 3 O2 ---> 4 CO2 + 2 H2O + 2 NH3 NH3 + 2 O2 ---> NO3- +H+ + H2O FIND: The theoretical CBOD The untimate NBOD The total theoretical BOD.A treatment plant has been designed to achieve 99 percent inactivation of Giardia Lamblia using chlorine dioxide. The engineer used data on the disinfection of Giardia Lamblia at 20°C for the design, but the plant operates in a northern climate, and current estimates are that the low water temperature in some winters will be 0.5°C. Estimate the expansion required in the contact chamber in order to achieve the same inactivation at that temperature. You may assume complete mixing in the contact chamber and that the inactivation of Giardia Lamblia follows the Chick-Watson relationship. Ct values for achieving 90% inactivation of Giardia Lamblia (mg.min/L) Temperature (°C) 0.5 °C 5 °C 10 °C 15 °C Chlorine 0.97 0.63 0.48 0.32 dioxide * Note that the chick Watson's disinfection rate constant is a function of temperature. 20 °C 0.24 25 °C 0.16Charcoal samples from Stonehenge in England wereburned in O2, and the resultant CO2 gas bubbled into asolution of Ca(OH)2 (limewater), resulting in the precipitationof CaCO3. The CaCO3 was removed by filtration anddried. A 788-mg sample of the CaCO3 had a radioactivityof 1.5x 10-2 Bq due to carbon-14. By comparison, livingorganisms undergo 15.3 disintegrations per minute pergram of carbon. Using the half-life of carbon-14, 5700 yr,calculate the age of the charcoal sample.
- Which of the following is not a cause of energy loss in pipes? O Boundary friction O Changes in pipe diameter or geometry O The presence of control valves or fittings O Pipe temperatureAluminum pieces inadvertently collect on the filter. a. If left on the filter, will the percent yield of the alum be reported as too high or as too low? Explain. b. If the aluminum pieces are detected on the filter, what steps would be used to remedy the observation? Explain.It is a kind of wastewater treatment where they use activated carbon to treat water. A. Sedimentation B. Coagulation| C. Filtration D. Activated Carbon Adsorption