What is the BOD, of a waste that yields an oxygenconsumption of 2.5 mg/L from a 1.00 percent sample? If the ultimate BOD for this sample is 350.0 mg/L what is the rate constant, if you can assume the temperature is 20 °C?
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- You are the lead engineer on a wastewater treatment plant with a biological reactor. You are required todetermine how much biomass will be produced in kg per day in your plant. A junior engineer determines theultimate BOD of the incoming waste as 600 mg/l, with a decay constant of 0.1/d. The incoming substrateconcentration used should be the five-day BOD. The incoming flow is 75 m3/d however there are lossesupstream of the plant accounting for 15 m3/d of the flow. The target BOD discharged from the plant is 25mg/l. the kinetic constants for the system are Ks = 90 mg/L BOD5, kd = 0.2 d-1, μm = 1.5 d-1, and Y = 0.6 mg VSS/mgBOD5. Include a sketch to illustrate the biological reactor and its incoming flows.An effluent stream sample (500 mL) from a metal-working facility contains 0.52 g nickel sulphate. (i) What is the nickel concentration of this effluent stream (in mg/L)? (ii) Would you regard this concentration as suitable for discharge to the local sewage system? (iii) How much total nickel (in kg) leaves the facility per year in this stream if ~1 ML of effluent is produced?An artisanal gold mine discharges 0.87 kg/day of mercury into a lake. The outlet stream discharge was measured at 1.6 m3/s with a steady state concentration of 5.2 ppb mercury. What is the percentage of the contaminant that is lost in the lake?
- If the BOD4 of a waste is 200.0 mg/L and the ultimate BOD is 270.0 mg/L, what is the rate constant at 10⁰C.A city receives 42 tons per day of a solid waste stream with chemical formula C4H17O to their waste to energy facility each day. Estimate the air requirements to combust this waste in cubic ft per day. Assume specific weight of air is 0.075 lb/cu ft and that air is 21% oxygen by weight.Suppose 1 m3 of an aquifer is contaminated with toluene.Groundwater moves through at an actual speed of 0.03 m/day and the toluene has a dissolved concentration equal to 20% of its solubility.How long will pump and treat take (in years) to remove the toluene spill?Toluene Conc. 4 LPorosity: 30%
- Dissolved oxygen (D0) is influenced by which factors? Explain. How can you determine chloride content in a waste water sample? Subject: Enviromental Engineering 2 labIf the chlorine demand for a water is 3.0 mg/L, and the breakpoint is at 3.0 mg/L, what would the amount of chlorine that would need to be added in (in mg/L) if you desired to have a free chlorine residual of 2.0 mg/L in the water?A certain city has a solid waste generation rate of 0.59 kg/capita-day. Supposed that the bulk density of the MSW is 530 kg/m3, find the volume in m3 of the MSW generated by 1,000 people per year.
- A river traveling at a velocity of 10 km/day has a dissolved oxygen content of 5 mg/L and an ultimate cBOD of 25 mg/L at distance x=0 km, that is, immediately downstream of a waste discharge. The waste has a cBOD decay coefficient kl of 0.2/day. The stream has a reaeration rate coefficient k2 of 0.4/day and a saturation dissolved oxygen concentration of 9 mg/L. (a) What is the initial dissolved oxygen deficit? (b) What is the location of the critical point, in time and distance? (c) What is the dissolved oxygen deficit at the critical point? (d) What is the dissolved oxygen concentration at the critical point?Assume emissions of all sulfur compounds increase from 100 x 1012 grams/year up to 150 x 1012 grams/year, while the global average concentration increases from 0.906 ppb to 1 ppb. Removal by wet deposition under these new conditions has a rate constant kwet = 0.3 week-1. a. For the mass balance of all sulfur compounds, explain in 2-3 short sentences why there is no chemical reaction term in the mass balance equation, only wet and dry deposition. b. Determine the residence time of sulfur compounds in the atmosphere due to dry deposition alone, assuming the atmosphere is in steady state with respect to sulfur.A waste has an ultimate BOD of 1,000 mg/L and a kL of 0.1/day. What is its 5-day BOD?