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The given groundwater shows the following chemical composition: Sodium =7 mgIL, Calcium = 70 mg/L, Magnesium = 35 mg/L, Potassium = 1 mgIL Bicarbonate = 200 mg/L, Sulfate = 30 mgIL, pH = 7.5 Atomic mass unit: sodium (23), calcium (40), magnesium (24.3), potassium (39.1) Sulfur (32.1), hydrogen (1), oxygen (16), carbon (12) Can all calcium and magnesium in the groundwater, theoretically, be removed by internal alkalinity during the softening process? If not, how much calcium and or magnesium should be removed by the addition of external source of alkalinity? Show your work for the full credits.
A tensile test was performed on a metal specimen having a circular cross section with a diameter of 0.50 inch. The gage length is 2 inches. For a load of 13.5 kips, the elongation was 4.66 x 10-3 inches.
Rigid members ABC and DEF are joined with steel links BE and CF using 25mm pins. The links are made of 25mm thick 50mm wide plates and are single shear. Determine the maximum normal stress in each of links BE and CF
Find the discharge with an 80% risk of being equaled or exceeded at least once in the next 10 years. (Hint: first find the annual probability of exceedance for this discharge.)
Given the following information, determine the required DO concentration in the treatment plant effluent discharge in order to ensure that at no point downstream the DO in the river drops below 4 mg/L:
A fire hydrant is supplied through a 6 inch cast iron pipe of 16,000 feet length. The total drop in pressure is limited to 35 psi. What is the discharge through the pipe for a water temperature of 80°F ((kinematic viscosity) = 0.93 × 10-5 ft2/sec)
a gate having cross section shown in fig closes an opening 5 ft and 4 ft high in a water reservoir. The gate weighs 400lb and its center of gravity is 1 ft to the left of AC and 2 ft above BC. Determine the horizontal reaction that is developed on..
What are the annual runoff coefficient (Runoff/Rainfall ratio) for the sub areas and for the total watershed taken as whole Sub-area Area (m2)/ Annual Precipitation (mm)/ Annual Evaporation (mm) A 10.7 1030 530 B 3.0 830 438 C 8.2 900 430 D 17...
A sample of neon has a volume of 555 mL when it is at a pressure of 813 mmHg. What will be the volume when the pressure is increased to 1138 mmHg?
Incandescent light bulbs have been phased out in the US because they are very inefficient (i.e., they produce a very large amount of heat). A 10 W light-emitting diode lamp (LED) can produce about the same light output as incandescent light bulbs
Blood is flowing through an aorta of 1.0 cm diameter at an average velocity of 50 cm/s. The mean pressure is 100 mm Hg, The blood enters a stenosis where the aortic diameter is 0.5 cm. What is the appropriate pressure at the point of maximum steno..
It rains an average rate of 0.4 in/hr in a 600 acre watershed for 3 days. Determine: a) average rainfall rate in cfs b) rainfall volume for the 3 days in acre-ft c) rainfall volume in inches.
Ten tons of a mixture of paper and other compostable materials has a moisture content of 7%. How many tons of water must be added to the solids to achieve a mixture with 50% moisture for composting
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