1. A water sample has an influential alkalinityof 123 mg/L as CaCO3. Ferric Sulfate isadded at a dose of 73 mg/L for coagulation.Assume all alkalinity is HCO3- and ignoreall side reactions.A) How much alkalinity is consumed in thecoagulation reaction (in meq/L)?B) How much alkalinity remains aftercoagulation (in mg/L as CaCO3)

Step 1: For A) The coagulation reaction between FeSO4 and CaCO3 is : FeSO4 + CaCO3 = CaCO4 + FeO +…

Answered: 1. A water sample has an influential…

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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A Pump & Treat water treatment system at a contaminated site is designed to treat 5 m3/d of ground water in a reactor designed as a well mixed system. The effluent must meet quality standards of 25 mg/L of Iron. The treatment reactor’s 20 m3 volume is believed to be insufficient to achieve the standard. The ground water has an iron concentration of 100 mg/L and the treatment reactor has a kinetic constant of 0.5 d-1. – Confirm that the treatment system will NOT meet the effluent quality standards. – If not modify the design by adding a PFR system (using same treatment process and kinetics), what volume should the PFR addition be?
6 Ydu will obtain 2.0 L of tap water for you water hardness test. The water hardness test uses a precipitation reaction to precipitate the Calcium bicarbonate present out of solution by adding 1.9 g of Ca(OH) represented by the following equation: Ca(HC03|21ag) + Ca(OH)215) > 2CaCOsisi + 2 H20 ml What is the percent yield of CaCO3 produced in the hard water test? (fig. 4)
A drinking water treatment plant wants to compare the efficacy of three different solid coagulants, Alum [Al(OH)3(s)], Lime (CaCO3(s)), and Ferric Chloride (FeCl3(s)), for removing the phosphate (PO43-) level to 1 mg/L. The following are the equilibrium reactions [and the respective equilibrium constants (or solubility products, Ksp)] that result in phosphate removalfor each solid, the second reaction being more relevant in each case: Alum: Al(OH)3(s) ↔ Al3+ + 3OH- AlPO4(s) ↔ Al3+ + PO43- Ksp = 9.84 x 10-21 Lime: CaCO3(s) ↔ Ca2+ + CO32- Ca3(PO4)2(s) ↔ Ca2+ + PO43- Ksp = 1 x10-27 Ferric Chloride: FeCl3 (s) ↔ Fe3+ + 3Cl- Fe(PO4)(s) ↔ Fe3+ + PO43- Ksp = 1x10-26.4 What concentrations of Fe 3+, Al3+, and Ca2+ will be needed to maintain a phosphate concentration of 1 mg/L? What would be the best choice of solid coagulant for the Drinking Water Treatment Plant?…
4. Use the table below to calculate the following: The concentration (in mg/L and mol/L) of the coagulant active ingredient (Al2(SO4)3) in the stock solution (NOT the concentration of the hydrated form, which has been provided) The coagulant feed rate (in L/day) required to achieve target concentration The alkalinity consumed in the mixed water by coagulant addition (in mg/L as CaCO3). The stock solution does not contain any excess alkalinity. Coagulant Stock Solution concentration in Plant Flow mixed water (mgd) Concentration Spec. Gravity (mgAl2(SO4)3)/L) 6.5 21 26% Al2(SO4);•14H2O 1.28
The alkalinity of a water sample at pH 7 is 300 mg/L as CaCO3. Calculate the molar concentration of bicarbonate (HCO3-). Note that because the pH is less than 8, you can assume that all of the alkalinity is in bicarbonate form. Your Answer:
A sample of water at pH 10.5 has 36 mg/L of CO3-2 and 26 mg/L of HCO3-Including the contribution of [H+] and [OH-], find the alkalinity as CaCO3.
(a) (ii) Following chemical species were reported for water sample from a well. Concentration (milli equivalent)/L 15 15 05 30 12 18 8.8 Species Chloride (CL) Sulphate (SO2-) Carbonate (CO2) Bicarbonte (HCO3) Calcium (Ca²+) Magnesium (Mg2+) pH Find (i) The total hardness (in mg/L) as CaCO3 (ii) Alkalinity present in the water (in mg/L) as CaCO3.
8(a)
2. Cadmium is a pollutant of concern in mining. The initial concentration of cadmium in a mining wastewater (also called acid mine drainage) is 0.1 mg/L, and the EPA Maximum Contaminant Level (MCL) is 0.005 mg/L. What must the pH be so that the wastewater does not exceed the EPA MCL? Given: Cd(OH)2 → Cď²* + OH (unbalanced) K, = 5.33 x 1015 Cd(OH)2: Cd2+ = 112.4 g/mol 17.0 g/mol = 146.4 g/mol OH- =
A dose of 100 me/1 of alum is used in coagulating a turbid raw water. Calculate the sum of amount of permanent hardness and precipitate produced in a 1L sample. (Only HCO, alkalinity present.)
Soove it asap pl
For a solution with a pH equal to 9.5, express the concentrations of H+ and OH- in units of meq/L and mg/L as CaCO3.

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