1. To finish the design of the effluent discharge channel, determine the amount of activated carbon should be added every day (kg/day) to dechlorinate treated effluent containing a chlorine residual of 4 mg/L as Cl₂ from a plant with an average flowrate of 1,000,000 m³/d.
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- An ion exchanger treats 1 MLD of water using an exchanger of capacity 100 kg/day/m3 with rate of flow being 0.5 m3/min/m2. Choose the correct statements assuming total hardness of water equal to 84 mg/1 as Cao. Total hardness of water is equal to 150 mg/l as CaCO3. Correct Option B Sodium Alumino - Silicates may be used as ion-exchanger. Correct Option lon exchanger can result in removing complete hardness. Correct Option Correct Option The height of ion exchanger required is 1.08 m if hardness of water is taken as 150 mg/1 as CacO3.A water-treatment plant is to process 30,000 m³/d. The rapid mixing tank will blend 35mg/l of alum with the flow and is to have a detention time of 2 min. The tank is to have a square cross-section with vertical baffles and a flat blade impeller. Determine the following: (a) Quantity (Kilograms per day) of alum added (b) Dimensions of the tank (c) Power input (kilowatts) necessary for a G value of 900 sec¹ Use dynamic viscosity of 1.139 10 Pa secWhat is the required free chlorine concentration to inactive 2 logs of Cryptosporidium at a water temperature of 25oC, if the flow rate is 1000 m3/day and the clearwell storage tank is 2 m wide by 2 m long and 1 m deep? (Assume plug flow conditions and full basin) *Hint : final answer C = 26 mg/L
- 1. A natural water with a flow of 4.0 MGD is to be treated with a commercial-grade alum dosage of 80 mg/l. Determine the amount of alum required (expressed in lbs/day), the amount of natural alkalinity required to complete the reaction (expressed in mg/l as CaCO3 and kg/day), and the amount of Al(OH)3(s) sludge produced (expressed in lbs/day and gal/day) if the sludge contains 2.2% solids by weight and the S.G. of the dry solids is 2.0.The aeration tank influent flows at a rate of 1600 cu.m/day with BOD(biochemical oxygen demand) of 145 mg/L. The MLSS is around 200 mg/L. If the capacity of the aeration tank is 2000 cu.m, determine which of the following statements is true. a) The aeration tank is not operating in an ideal condition; there are excess bacteria that might go with the treated water b) The aeration tank is operating in good condition; BOD and bacteria are in ideal balance c) The aeration tank is operating in good condition; however, there is a need to control the flow rate of the feed d) The aeration tank is not operating in an ideal condition; need to add more bacteria to treat excess BODThe BOD3 of a wastewater is determined to be 270 mg/L at 20 o The rate constant (k) value is known to be 0.34 per day as first order. (C: 12 g/mol, H: 1 g/mol, O: 16 g/mol) Note: Reaction should be stoichiometricly balanced CH2O + O2 ------> CO2 + H2O (a) What would be BOD5 value if tests were run at 20 oC? (b) What is the concentration of formaldehyde (CH2O) in wastewater?
- 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?A small lake with volume 10,000 m3 has a stream flowing into it with flow rate 100 m3/day and a Toluene concentration of 1.0 mg/m3. A factory discharges 5 m3/day into the lake with Toluene concentration of 10 mg/m3 – they want to increase effluent to 50 mg/m3. Toluene decays at a rate of 0.01/day. Assume steady-state and completely mixed (CSTR). a) How would this increase in discharge concentration change the lake concentration? b) Field studies show that the same lake would be better represented by dividing the lake into two cells. The first cell having a volume of 2,500 m3 and the second with 7,500 m3. How does this affect the estimate of concentration leaving the lake? Compare with one-cell model.Assume the factory continues to discharge at 10 mg/m3 into the first cell.c) Why does modeling the lake as multiple cells impact the final concentration leaving the lake? What do you expect might happen to the final concentration leaving the lake if we modeled it as more cells? How would…You are considering available options to meet new effluent quality standards for a particular contamination being treated at your plant. Currently you are operating with two reactors connected in parallel as shown in Figure 1(a). One reactor is a plug flow reactor (PFR), the other is a completely stirred tank reactor (CSTR). The following information is available: Design flow, Q: 60 L/min Influent concentration, Co: 10 mg/L Order of reaction: 1st Order Decay constant, k: 0.25 min! Volume of PFR, Vp: 360 L Volume of CSTR, Vc: 2280 L Using the above information, determine: a. The residence time, t, in each reactor; b. The effluent concentration from the PFR; C. The effluent concentration from the CSTR. d. The resulting effluent quality with the two reactors in parallel. You want to investigate whether operating these reactors in series will allow the required effluent standard of 0.25 mg/L to be met. You are therefore proposing the new configuration for the reactors shown in Figure 1(b)…
- Hello, I have an equalization tank with the following dimensions: Tank Dimensions: Height: 5.15 meters Length: 10.3 meters Width: 30.48 meters Total volume calculated: 1616.8116 m³ The design flow is 2.5 MGD. I want to treat the pH and alkalinity with soda ash. pH: 4.9 (desired: 7) Alkalinity [mg/L]: 44 mg/L (desired: 200 mg/L) How can I calculate how much soda ash I need to treat the pH and alkalinity in the equalization tank?A Granulated Activated Carbon (GAC) adsorption laboratory column 10cm in diameter and 3m deep, is found to produce good results in COD removal when operated at a flow of 50L/h. The porosity of the GAC is 0.5 Calculate the following: You need to design a GAC system consisting of two columns in series for treating the same water at a rate of 0.5 ML/d. Practical considerations limit the diameter of the columns to 3m. Calculate the minimum required height of the columns. Area=7.854×10−3m3 Volume= 6.3660m/hr t=0.47123 Q=2.122 bed volume /hr1. A CM reactor receives influent containing 10 mg/L of tracer dye for 2 hours. The tracer addition is terminated but the flowrate of water is maintained. The volume of the reactor is 10 L and the flowrate is 2 L/hr. What is the concentration of tracer in the reactor 1 hr after the dye addition is terminated? The reactor had an initial concentration of tracer of 1 mg/L when the tracer addition commenced.