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- 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 of CO2. The commercial grade of quicklime has a purity of 85%, and the soda ash has a purity of 95%. Determine a. The pounds of quicklime and soda ash required per million gallons. b. The tons of quicklime and soda ash required per month if a month is considered to be 30 days.3. Circular clarifiers are used to remove solid materials from water. They allow continuous treatment of water and can handle fairly large flows. Solids settle to the bottom of the clarifier and are carried away by a small stream of water (the waste stream). Most of the water exits the tank as treated effluent. Assume a clarifier receives a flow of 0.10 m3/s with a solid concentration of 800 mg/L. If the waste stream consists of 3% of the incoming flow and carries 90% of the incoming solids, a) what is the solids concentration in the waste stream, and b) what is the solids concentration in the treated effluent?MPN of effluent is 106/100 ml and it reduces to 102/100 ml after chlorination. Find percentage removal (%R) and log removal (logR) of MPN.
- Water treatment plant proble need solutiona. Compute the liquid limit.b. Compute the plastic limit.c. Compute the natural water content.d. Compute the liquidity index.This unit in the wastewater treatment system settles dense inorganic particles not removed by the influent screens. clarifier grit chamber equalization basin aerators none of the choices
- A PFR is not meeting effluent requirements so baffles are going to be added to the tank toincrease contact time. The tank is 12 ft deep, 40 ft wide, and 120 ft long. The engineer isgoing to add long baffles to the tank. The baffles will be 90% of the tank length. If thecurrent HRT is 0.5 d, and the influent concentration is 9 mg/L with an effluent limit of 1.5mg/L, how many baffles need to be added? Assume k=1.98/dayA tank is initially filled to capacity with 300 L pure water. At t=0, brine containing 2 g/L salt is pumped into the tank at a rate of 25 L/min. The well-mixed solution is pumped out at a larger rate of 50 L/min. Determine the concentration of the salt inside the tank after 5 min. Use dQ/dt = ci vi - co vo as a formulaThe pOH of a basic solution is 3.33. What is pH?
- An impellar blade unit operates at 50 rpm. Determine the degree of mixing? Also if the blade operates from 50 rpm to 100 rpm what is the percent increase?Advantages and Disadvantages of manual and mechanical mixing.(a) A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m3 /s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system. (B) A water treatment at Nibong Tebal receiving a raw water contains a concentration of 0.5 µg/m3 atrazine from Kerian River. In order to comply with the drinking water quality guideline, the treatment plant should reduce the concentration of Atrazine to 0.1 µg/L. If the dosing of powdered activated carbon have been applied before the coagulation, calculate the minimal dose of PAC in mg/m3 .