9-2(15 pts) Determine the alkalinity, total hardness, carbonate hardness, and non-carbonatehardness (in mg/L CaCO3) for the water (pH 7.4) with the following chemical concentrations.Calculate the doses of lime and soda ash to soften this water.Constituent Concentration, mg/LCa2+95Mg2+13.5Na25.8HCO3244SO 2-73CI67.8H2CO37.7

To determine the alkalinity, total hardness, carbonate hardness, and non-carbonate hardness for the…

Answered: 9-2 (15 pts) Determine the alkalinity,…

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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Write the importance of BOD/COD ratio. If 5 days 25 °C BOD of sewage sample is 180 mg/L, calculate its 5 days 20 °C BOD. Assume the deoxygenation constant at 20 °C, K 20 as 0.23 d-¹ at base e. Deoxygenation constant varies with with temperature as KT = K20 (1.05)T-20, where T is temperature in °C.
(d) Ca(HCO3)2 = 150 mg/L; Mg(HCO3)2 = 200 mg/L; CaSO4 = 180 mg/L; MgCl2 = 95 mg/L; CaCl2 = 137 mg/L; turbidity = 15 mg/L; NaCl = 58.5 mg/L. Calculate: (i) Carbonate and non-carbonate hardness in degree Clark. (ii) The cost of limesoda process, if lime (95% pure) is Rs.200/10 Kg and soda (86%pure) is Rs. 400/10 Kg for softening of 150,000 liters of hard water using Al2(SO4)3 as a coagulant @ 28.5 mg/L. (iii) A hard water sample having 530 ppm CaCO3 equivalent hardness was completely softened on passing over a zeolite bed. The exhausted bed was subsequently regenerated using 75 liters of 45 percent brine solution. Calculate the quantity of hard water that has been softened using zeolite softener.
Concretes have several properties. Which one of the following statements is incorrect? a. Concretes have good tensile strength b. Concretes have good shear strength c. Concretes have good compressive strength d. Concretes have good wear resistance
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Treatment plant questions
A water sample having a pH of 10 at 25°C contains the following ions: Na* = 56 mg/1 Mg²+ = 24 mg/1 Ca²+ = 50 mg/1 CO₂-² = 75 mg/1 Cl- = 35.5 mg/1 The carbonate and non-carbonate hardness of the water sample, respectively are A B C D 125 and 225 (mg/1 as CaCO3) 125 and 100 (mg/1 as CaCO3) 130 and 225 (mg/1 as CaCO3) 130 and 95 (mg/1 as CaCO3)
The following waste water test result were obfecined fox test of teken-The Simple concen foation solids, Suspended susporded a Simple were pecfooned. eusing the 50 mL Calculate oftotel and volctile Solid solids votit volatile Mass of empty dish =62.0039sam mass of 4 Mass %3D dish t doy Solids = 62.0394 %3D dish + igmited solids = 62: 0367 of u Mass of filter=1540 gram of filter tday solids = 1-S5agsom %3D L) MUss y muss of filtest iynited Solids 1:5494 こ

An activated sludge system using CSTR with sludge recycle has an influent flow rate (Q°) of 2.5 MGD that contains BOD of 200 mg/L. The volume of the aeration tank (CSTR) is 0.6 million gallons. The MLVSS (assume this is X,) in the aeration tank is 2000 mg VSS/L and the decay rate (b) is 0.1/day. The effluent from the secondary clarifier meets NPDES standards for suspended solids and BOD. The concentration of the settled sludge exiting the bottom of the secondary clarifier is 15,000 mg VSS/L. The sludge waste flow rate (Q") is 1 % of the influent flow rate, and the effluent flow rate (Qª) is ~99% of the influent flow rate. а) What is the hydraulic retention time, 0 (d)? b) What is the solids retention time, 0x (d)? Activated sludge with recycle с) What is the F/Ma ratio?
Water treatment please answer quickly please
In a municipal wastewater treatment plant, the influent flow rate into a complete mixing activated sludge system is 50 L/sec, its solid concentration MLSS is 30 mg/L, and the BODs in the influent is 245 mg/L. The MLSS concentration at the bottom of the secondary clarifier is 15,000 mg/L and 10 mg/L at the top of the |clarifier. The flow rate of returned activated sludge is 20 L/sec. a. What is the concentration of the MLSS in the activated sludge reactor (assuming that it is fully mixed and has constant concentration)? b. What is the activated sludge basin volume if the hydraulic retention time in the basin is 10 hours and the system is operated at the R/Q ratio given in the problem? |c. If the cross section of the basin is 20 m² (perpendicular to the flow), how long the basin will be? d. The plant has 96% BOD5 removal. What is the effluent BOD5? e. The flowrate of the waste activated sludge (WAS) is 0.2 L/sec. How many solids (in kg) are wasted every day through the secondary…
Discuss the significance of the determination of Grain size analysis and water content. (10)
3. The dissolved solids content is determined by filtering a portion of the sample through a glass fiber filter disc into a porcelain evaporating dish, drying the sample at 100°C, and igniting the residue by placing the dried sample in a muffle furnace at 550°C. The following masses are recorded: *Volume of sample: 25 mL •Mass of empty dish: 51.494 g a) The total dissolved solids content is: •Mass of dish and dried solids: 51.524g •Mass of dish and ignited solids: 51.5069 g b) The volatile dissolved solids content is: Does the total solids content equal the sum of the suspended and dissolved solids? c) The fixed dissolved solids content is:

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