A compressor compresses air flowing at 15 litre/s, 150 kPa, 20°C at the inlet to 500 kPa, 250°C at the outlet. During the compression, heat is lost at the rate of 1.5 kW. Determine the minimum input work for the compressor.

The density and percent crystallinity for two Nylon 6,6 materials are:

1.188 g/cm³ and 67.3%

1.152 g/cm³ and 43.7%

Compute the density of the totally crystalline and totally amorphous Nylon 6,6.

Discuss the advantages and disadvantages of disinfectants for pathogen removal from drinking water

environmental fate of medications medications can enter wastewater management systems either ... Question: Environmental fate of medications Medications can enter wastewater management systems either thro... (1 bookmark) Environmental fate of medications Medications can enter wastewater management systems either through human excretions or through improper disposal. Many medications are not effectively treated by current wastewater management processes and therefore are discharged by wastewater treatment plants. Antidepressants are some of the most commonly prescribed medications in the United States, and many antidepressants are not effectively managed by wastewater treatment plants. a. A wastewater treatment plant discharges to Boulder Creek in Colorado at a rate of 64 million L/day, and the stream flow, upstream of the wastewater discharge point, is 1110 L/s. If the concentration of the antidepressant venlafaxine (Effexor) measured in the creek water is 10 ng/L, what is the mass discharged per day from the wastewater treatment plant, assuming that there are no sources other than the wastewater treatment plant, and assuming that the drug rapidly equilibrates among sediment, fish, and water? What is the concentration of the medication in the wastewater treatment plant effluent?

environmental fate of medications medications can enter wastewater management systems either ... Question: Environmental fate of medications Medications can enter wastewater management systems either thro... (1 bookmark) Environmental fate of medications Medications can enter wastewater management systems either through human excretions or through improper disposal. Many medications are not effectively treated by current wastewater management processes and therefore are discharged by wastewater treatment plants. Antidepressants are some of the most commonly prescribed medications in the United States, and many antidepressants are not effectively managed by wastewater treatment plants. a. A wastewater treatment plant discharges to Boulder Creek in Colorado at a rate of 64 million L/day, and the stream flow, upstream of the wastewater discharge point, is 1110 L/s. If the concentration of the antidepressant venlafaxine (Effexor) measured in the creek water is 10 ng/L, what is the mass discharged per day from the wastewater treatment plant, assuming that there are no sources other than the wastewater treatment plant, and assuming that the drug rapidly equilibrates among sediment, fish, and water? What is the concentration of the medication in the wastewater treatment plant effluent?

Environmental fate of medications Medications can enter wastewater management systems either through human excretions or through improper disposal. Many medications are not effectively treated by current wastewater management processes and therefore are discharged by wastewater treatment plants. Antidepressants are some of the most commonly prescribed medications in the United States, and many antidepressants are not effectively managed by wastewater treatment plants. a. A wastewater treatment plant discharges to Boulder Creek in Colorado at a rate of 64 million L/day, and the stream flow, upstream of the wastewater discharge point, is 1110 L/s. If the concentration of the antidepressant venlafaxine (Effexor) measured in the creek water is 10 ng/L, what is the mass discharged per day from the wastewater treatment plant, assuming that there are no sources other than the wastewater treatment plant, and assuming that the drug rapidly equilibrates among sediment, fish, and water? What is the concentration of the medication in the wastewater treatment plant effluent? BCF = 40.27 KOC = 3.162 Organic sediment = 15 ppm Biota concentration = 5 g/100 m3 b. A man fishing near the outflow point of Boulder Creek eats 0.2 kg of fish from the creek. How much venlafaxine will he ingest? One dose of Effexor contains 75 mg of venlafaxine. What percentage of a dose will the fisherman ingest?

Velocity field for this system is:

V=[X^2-(y*z^1/2/t)]i-[z*y^3+(x^1/3*z^2/t^1/2)j+[-x^1/3*t^2/z*y^1/2]k

find the components of acceleration for the system.

Question 2. A family in Eastern Australia installs solar panels to run an air-source heat pump to heat their swimming pool. The panels produce a total of around 6 kW of electricity during the day. The heat pump draws 5 kW of electricity and delivers 23 kW of heating to the pool.

a) The pool contains 40,000 litres of water. When the heat pump is running, estimate the rate at which the temperature of the water in the pool rises, in kelvins per hour. How much would the pool heat up after 8 hours of running the heat pump? Assume a specific heat capacity for the water of 4.18 kJ kg–1 K–1. [4 marks] Answers: 0.5 K per hour, 4 K

b) If the cost of electricity in that part of Australia is 0.25 $ per kWh, how much has the family saved by using solar power instead of purchasing electricity to heat the pool directly for 8 hours? [2 marks] Answer: $46

c) The additional 1 kW of electricity generated by the solar panels is available to run the centrifugal pump that pumps the water from the swimming pool through the heat pump (a negligible amount of this energy ends up as heat energy in the water; most is lost to the atmosphere). Figure 2.1 shows the characteristic curves for the pump at different speeds. The pump sits below the pool, with pipework totalling 11 m of 25.4 mm internal diameter smooth plastic piping. There is a sharp-edged inlet (KL = 0.5) and exit back into the pool (KL = 1.0), with two 90° bends (KL = 0.85 each) in the pipework on both the suction and discharge sides (four 90° bends altogether).

i) Write down the extended form of Bernoulli’s equation, including terms to account for the head loss due to friction and the head contributed by the pump. [3 marks]

ii) In this system the head loss due to friction must be just balanced by the pressure head increase delivered by the pump. Show that the head loss due to friction can be expressed as a function of the volumetric flowrate of fluid through the pump, Q, as follows: 2 ?h f ? 20 00 00KQ [6 marks]

iii) For a flowrate of 120 litres min–1, use the Moody chart on page 3 to show that the Fanning friction factor is around 0.0044, and show that the head loss due to friction is 10 m. Assume the density of water is 1000 kg m–3 and the viscosity is 0.001 Pa s. [10 marks]

iv) From the characteristic curves shown in Figure 2.1, identify the pump speed in rpm required to deliver the desired flowrate of 120 litres min–1. Explain your reasoning. [2 marks] Answer: 2000 rpm

v) Calculate the power drawn by the pump to deliver 120 litres min–1, if the pump efficiency is 65%. [3 marks] Answer: 300 W

Design of Shell and Tube Heat Exchanger
Crude oil at 198°C is to be cooled to 39°C. The oil flow-rate is 6.127 kg/s. Cooling water
is available at 29°C and at the rate of 27.127 kg/s. The pressure drop allowance for each stream
is 100 kN/m2
. Design a suitable shell and tube heat exchanger for this duty.

The following are the properties of the two streams at the average temperature:

Data:
Assume overall heat transfer coefficient of 502 W/m2 K.
Tubes: 20 mm o.d., 16 mm i.d. tubes, 4 m long, square pitch 1.25do, carbon steel.
Pull through head, Floating Head type heat exchanger.
Baffle = 1/5 of the shell diameter and 25 % cut baffles
Fouling factors 0.0003 m2 K/ W for cooling water and 0.0002 m2 K/ W for crude oil
Thermal conductivity of metal = 57 W/m K

Present your results with detailed calculations to design Shell and Tube Heat Exchanger. Mention the various assumptions made in the calculations.

Estimate the cost of the heat exchanger.

Define (i.e. physical meaning) SRT, HRT, F/M ratio, SVI and indicate their importance during the operation of an activated sludge process in wastewater treatment plants.

Q1. What is the dominant form of benzoic acid at pH 2. Suggest the dominant form of caffeine at pH 2.

Q2. This lab uses a C18-reverse phase column. What does the stationary phase consists of? Is it polar or nonpolar?

Q3. Predict whether benzoic acid or caffeine will come out of the C18-reverse phase column first at pH 2.

Q4. To prepare the calibration standard solutions, calculate how much of each stock solution of sodium benzoate and caffeine should be added to each of the 25 mL volumetric flasks (See the procedure).

Q5. What are the peak absorption wavelengths of sodium benzoate and caffeine, respectively?

Describe the process of carbon dioxide absorption by a named solvent in a plate tower.

For IEUBK Model) 1.What assumptions are made when using this type of model? That is what values or relationships must the model include, which you did not supply. 2.What are the model supplied (“fixed") parameters which are assumed? 3.What are the user-supplied input variables required to run the model?

Discuss a number of waste removal/ disposal methods for chlorinated hydrocarbon solvents in the petrochemical industry

A gasoline storage tank drains by gravity to a tank truck; see the drawing. The pipe line between the tank and the truck is 100 m of 0.1 m diameter commercial steel pipe. The properties of gasoline are given as, density=720 kg/m3, dynamic viscosity = 0.0006 kg/m.s. Both tank and truck are open to the atmosphere, and the level in the tank is 10 m above the level in the truck. What is the volumetric flow rate of the gasoline? and how we choose moody chart