A DWTP pumps groundwater as a raw water source. The relevant water quality parameters are as follows: Compound Concentration of the ion/compound (mg/L) pH 7.3 units CO2 25 Ca2+ 55 Mg2+ 40 HCO3- 50 SO42- 90 a) What is the dose of lime and soda (in mg/L as CaCO3) required to reduce the hardness to zero? calculate using Bar diagram

A DWTP pumps groundwater as a raw water source. The relevant water quality parameters are as follows: Compound Concentration of the ion/compound (mg/L) pH 7.3 units CO2 25 Ca2+ 55 Mg2+ 40 HCO3- 50 SO42- 90 a) What is the dose of lime and soda (in mg/L as CaCO3) required to reduce the hardness to zero? calculate using Bar diagram

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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7. Calculate the amount of lime (84%) and soda (92%) required for treatment of 20,000 litres of water, whose analysis is as follows: Ca(HCO3)2 = 40.5 ppm; Mg(HCO3)2 = 36.5 ppm; CaSO4 = 34 ppm; CaCl2 = 27.75 ppm; MgSO4 = 30.0 ppm; SiO2 = 3.5 ppm; NaCl = 10 ppm. Also calculate the temporary & permanent hardness of water sample.
The analysis of water quality from an artesian well presented the result Alkalinity atbicarbonates equal to 24 (mg/L CaCO3), the pH of 7.0, the concentration of Ca+2 equal to 14 mg/L and theMg+2 concentration equal to 20 mg/L.Knowing that the equivalent weight of CaCO3 is equal to 50, of Ca+2 equal to 20 and of Mg+2 equal to 12.It is concluded that the permanent and temporary hardness, respectively, are: (A) 24mg/L (CaCO3) e 118 mg/L (CaCO3).(B) 94 mg/L (CaCO3) e 24 mg/L (CaCO3).(C) 24 mg/L (CaCO3) e 94 mg/L (CaCO3).(D) 94 mg/L (CaCO3) e 118 mg/L (CaCO3).
1. A sample of water having a pH of 7.2 has the following concentration of ions. Determine the water's total hardness. lon Concentration (mg/L) HCO, 110 so* 67.2 CI 11 lon Concentration (mg/L) Ca* 40 Mg* 10 Na' 11.8 K* 7.0
From water sample, 25 mg/L HCO3" as CacO3, 10 mg/L C032 as Caco3 and 50 mg/L Ca* as CaCO3 were measured. pH was near neutral. What is alkalinity? () mg/L as Cac03 (*Answer in whole number only)
Which of the following is not an apparatus or supplies for the Plastic Limit O flat glass plates for mixing soil and for rolling threads ) Distilled water O A length of rod 3 mm in diameter and 100 mm long ) Casagrande apparatus Based on the below data from a sieve analysis test, what is the cumulative percent retained above 1.25 mm sieve: Sieve Mass Size Retained 5.00 mm 10 2.50 mm 40 1.25 mm 30 630 pm| 120 315 um 12 8 160 μm Pan O 64% 36% O 22.5% O77.5% The hydrometer method is based on Stokes equation for the velocity of a freely 8 (Ctrl) - falling sphere. True False
How many pounds per day (lbs/day) of lime and soda ash need to be delivered daily to a plant treating groundwater with the following characteristics (do not worry about adding any safety factor, even though you would in the real world): Calcium Carbonate Hardness (CaCH) = 200 mg/L as Calcium Carbonate Magnesium Non-Carbonate Hardness = 100 mg/L as Calcium Carbonate (Use soda ash; carbon dioxide is not an option) Alkalinity= 200 mg/L as Calcium Carbonate Flow Treated = 10 MGD The answers are expressed in units of lbs/day with lime first followed by soda ash O 4,800 and 3,100 O 22,600 and 31,000 O 15,000 and 7,400 O 18,500 and 8,800
8. A laboratory provides the following analysis obtained from a 50-ml sample of raw water: Ca - 60 mg/L, Mg¹- 10 mg/L and the alkalinity is 150 mg/L) What is the hardness of this water sample in units of mg/L as CaCO,? What are the carbonate hardness and non-carbonate hardness? |
Unit operations question
A groundwater contains the following constituents: CO2 = 9.6 mg/L Ca?+ = 95.2 mg/L 1. Mg?+ = 25.8 mg/L HCO3 = 198 mg/L as CaCO3 The facility is to treat 50 x 106 L/d of water from this source using lime-soda ash to reduce the hardness. Determine the quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% Cao by weight and the soda ash is pure sodium carbonate.
Problem 4. A receipt of surface water sample is given in Table below: Substance Concentration (mg/L) Total Hardness 1000 mg/L CaCO3 Phenolphthalein acidity 5 mg/L CaCO3 Phenolphthalein Alkalinity 3 mg/L CaCO3 It is known that phenolphthalein alkalinity is only due to CO3²- and phenolphthalein acidity is only due to H₂CO3. Assuming the hardness of sample is because of calcium and magnesium ions, alkalinity-acidity are due to the carbonate species, calculate: a) The pH of sample. b) Temporary and permanent hardness as mg/L CaCO3. c) Total alkalinity and acidity as mg/L CaCO3. Molecular weights (g/mole): Ca = 40, Mg = 24, H = 1, C = 12, 0 = 16
A laboratory provides the following solids analysis for a wastewater sample: TS = 290 mg/L; TDS = 37 mg/L; FSS = 38 mg/L. a) How you can measure the following parameters: Fixed Dissolved Solids: Volatile Suspended Solids: b) What is the total suspended solids concentration of this sample? c) Does this sample have appreciable organic matter? Why or why not