3.Following information obtained from the Cooper's Town waterreservoir. To complete a 100,000 m³/d water treatment facility design,CationCa2+Conc. (mg/L)AnionConc. (mg/L)121.3HCO3254Mg2+36.2SO42-186Na+8.1CI48K+12NO3pH19.17.3a) Construct a line diagram based on reactivity of the ion species. b) Estimatethe scaling potential of sample using Langelier Index. c) Determine TotalAlkalinity, Total Hardness, Carbonate Hardness and Non-Carbonate Hardness(mg/L as CaCO3). d) Determine the theoretical amount of lime and soda (kg/d)for removing hardness by chemical precipitation without any amount in excess.ka2 = 4.17*10-11, kca = 5.25*10-⁹, and neglect the ionic strength.(Reactivity of ion species: Ca2+>Mg2+>Na+>K+, HCO3>SO4²->CI>NO3¯)

Let's address each part of the question based on the provided water chemistry data from Cooper's…

Answered: 3. Following information obtained from…

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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Biomass and substrate mass balance equations can be merged giving QwXR/VX=Y/X (Qo/V) (So-S)-kd (i) Prove that X= SRT/HRT Note that HRT = t and SRT = tc. (ii) If you are an engineer working in a wastewater consultancy company, and obtained the following data: - SRT = 20 days HRT 20 hours = (Y(So-S)/1+kd(SRT)). So = 350 mg/L S = 100 mg/L Y = 0.15 kd = 0.22 per day Calculate the increment of MLSS (%) required in the aerobic tank if the discharge BOD5 in the effluent needs to achieve 10 mg/L.
2 A groundwater (Q1 = 5.0 L/s) reaches a point of convergence (mixing) in a river (Q = 1.0 m3/s) where an industrial wastewater discharge (Q2 = 10 L/s) also converges. /s). If the groundwater has ferrous iron with concentration [Fe2+] = 10.0 mg/L, the industrial wastewater has organic matter with concentration TOC = 50 mg/L, determine the COD of the river downstream of the mixing point.
mat assessment 8 number 8
Poorly treated municipal wastewater is continuously discharged directly into a lake. The discharge from the wastewater plant into the lake occurs at a flow of Qd = 1 m3/hr. The concentration of phosphate (PO43, M = 95 g/mol) in the discharge flow (Cxd) that is decaying with first-order kinetics is 100 mg/L. The lake is a well-mixed water body of 100 m3. (Phosphate is naturally uptaken by algae with a first- order decay rate constant equal to 0.20/day.) The concentration of phosphate in the incoming river (Cx,r) is 10 mg P/L. The incoming river flow rate is Q, = 10 m3/hr. %3D a) Which of the following equations represent the correct mass balance equation? O va = CxQr - CxdQd -QoutCxvout" kCx,outV %3D O 0 = Cx,Qr + CxdQd -QoutCxvout" kCx,outV X,r O 0 = CxQr + CxdQd -QoutCxvout- kV O 0 = Cx,dQr + Cx,,Qd -QoutCxout- kCxoutV
A treatment plant treats water at an average daily flowrate of 2.7 m3/s. The water is chlorinated before it flows into a 15000 m3 reservoir. The water flowing into the reservoir has a chlorine concentration of 3 mg/L. Chlorine decays at a rate of 0.24 h-1. Assume the reservoir is well-mixed and the system is at steady-state condition. (a) Determine the chlorine concentration at the discharge point of the reservoir. (b) The treated water flows from the reservoir into a transmission main. The pipe carrying the water has a diameter of 2 m and flows full. In the transmission main, chlorine decays at a rate of 0.19 h-1. Determine the concentration of chlorine 2 km from the treatment plant.
4 An activated sludge system is to be used for secondary treatment of 10,000 m³/d of municipal wastewater. After primary clarification, the BOD is 150 mg/L, and it is desired to have not more than 5 mg/L of soluble BOD in the effluent. A completely mixed reactor is to be used, and pilot-plant analysis has established the following kinetic values: Y = 0.5 kg/kg, k, = 0.05 d-¹. Assuming an MLSS concentration of 3000 mg/L and an underflow concentration of 10,000 mg/L from the secondary clarifier (MLVSS=0.8MLSS) determine (1) the volume of the reactor, (2) the mass and volume of solids that must be wasted each day, and (3) the recycle ratio.
Water treatment..
Environmental Engineering: Water Treatment Please consider each of the following points: a. Determine the required residence time for each reactor of 3 equal volume CSTRs in series given a zero-order reaction with a reaction rate constant, k = -5 mg/L hr. The influent concentration is 125 mg/L and 95% conversion is required across the three-reactor system. What is the total reactor system residence time? b. Determine the required residence time for a single CSTR given the same conditions. c. Determine the required residence time for a PFR given the same conditions. d. Why are all three residence time the same?
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- =
An identified source of irrigation water has ion concentrations of Nat, Catt and Mgt as 20, 10 and 8 mill-equivalent per liter, respectively. The SAR of this water is approximately:
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).

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