Environmental Engineering: Water Softening A lime soda softening plant treats a flow of 150 MGD, and the water has a hardness of 225 mg/L as CaCO3, an alkalinity of 178 mg/L as CaCO3, a Mg 2+ ion content of 39 mg/L, and 4 mg/L CO2. The commercial grade of quicklime has a purity of 85% and the soda ash has a purity of 95%. Use excess lime of 1.25 meq/L.  Determine: Compute the volume of sludge produced per millions gallons of water treated. Assume the sludge contains 10% solids and 90% water

Q: The following data were measured for the freeze–thaw test, AASHTO T 283. Three samples were…

A: Given that the diameter of samples is 6 in  Convert inches to mm D = 6 in.  =  150 mm

Q: For preparing PCC, would you prefer round and smooth aggregate or rough and angular aggregate?…

A: a. Choice of aggregate depends upon the type of construction. Round and smooth aggregates are used…

Q: A water with low alkalinity of 20 mg/L as CaCO3 will be treated with the alum lime coagulation. Alum…

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Q: A commercial laundry is considering constructing an ion exchange process to remove hardness from the…

A: The given data is: Qrequired=1000 m3/day Calcium, as CaCO3=200 mg/l Magnesium, as CaCO3=100 mg/l

Q: Explain the effect of fine content and plasticity on liquefaction resistance.

A: Fine Content : Fine content is defined as the percentage of soil particles that are smaller than…

Q: What is the amount of Moist Coarse Aggregate? b. What is the amount of SSD Fine Aggregate? c.…

A: Solution: Givendata  coarse aggregate = 1160 kg/m3  fine aggregate = 599 kg/m3 water content = 148…

Q: A compacted asphalt concrete specimen has the following properties:Asphalt content = 5% by total…

A: Calculate the voids in the total mixture (VTM),  VTM = 1-GmbGmm×100 where Gmb - Bulk specific…

Q: The mass of the aggregates to be tested in Los Angeles Abrasion Machine is 10,000g, what is the %…

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Q: List how high temperature failure of asphalt pavement occurs. Define oxidation in asphalt binder.…

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Q: Questions 30 is based on the information below: An asphalt concrete mix design has the following…

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Q: What dosage of lime with a purity of 90% of CaO is required to combine 35 mg/l of calcium.

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Q: Which equipment is used in the laboratory to determine asphalt cement high PG according to Superpave…

A: Equipment used to determine asphalt cement high PG  according to superpave mix design

Landfills

The landfill is a site used for the disposal of waste materials. The landfill is a solid waste facility that is often known as a dumping ground. The image below shows a landfill site in Hawaii. Landfilling is the most ancient and common method used for the disposal of waste. For the landfill, a deep trench is constructed in an isolated place away from the city. The trench for landfills is designed properly after analyzing the total population and the waste generation per capita. The waste is dumped into the trench and after every layer of waste, a layer of soil is spread on the top of it.