Example Treatment plant with capacity 50*106 l/day. This treatment plant required 20 mg/l alum. If the water alkalinity as CaCO3 is 6 mg/l. Find the yearly alum quantity and the quantity of CaO which is used as coagulant aid? Atomic weights: Al=27, O=16, H=1, C=12, Ca=40

Example Treatment plant with capacity 50*106 l/day. This treatment plant required 20 mg/l alum. If the water alkalinity as CaCO3 is 6 mg/l. Find the yearly alum quantity and the quantity of CaO which is used as coagulant aid? Atomic weights: Al=27, O=16, H=1, C=12, Ca=40

Solid Waste Engineering

3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter2: Municipal Solid Waste Characteristics And Quantities

Section: Chapter Questions

Problem 2.6P

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Treatment plant with capacity 50*106 l/day. This treatment plant required 20 mg/l alum. If the water alkalinity as CaCO3 is 6 mg/l. Find the yearly alum quantity and the quantity of CaO which is used as coagulant aid? Atomic weights: Al=27, O=16, H=1, C=12, Ca=40
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Determine the 95% confidence interval for the true mean DO concentration.
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Local environmental regulations prescribe a minimum DO concentration of 2.0 mg/L. Perform a hypothesis test to determine whether the river’s water quality satisfies local regulations at a 5% significance level. (follow the 8step hypothesis test)
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 a. Local environmental regulations prescribe a minimum DO concentration of 2.0 mg/L. Perform a hypothesis test to determine whether the river’s water quality satisfies local regulations at a 5% significance level. (follow the 8step hypothesis test)b. Assume that the daily DO concentration is normally distributed. Estimate the values of the parameters μ and σ.c. Determine the 95% confidence interval for the true mean DO concentration.
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Assume that the daily DO concentration is normally distributed. Estimate the values of the parameters μ and σ.
For the following wastewater and biomass characteristics: Q0 = 50 m3/d S0 = 60 mg NH4+-N/l Xi0 = 20 mg/l k= 2.5 mg NH4+-N/mg VSS-d K = 1 mg/l Y = 0.34 g VSS/g NH4+-N b = 0/day Calculate the volume of the CSTR required for 50 and 98% removal of ammonia by oxidation to nitrate.
Consider a wastewater treatment reactor where with an influent flow rate of 2,500 m3/day and where the biomass has the following kinetic characteristics: fs0 = 0.7, KS = 10 mg/l, k= 10 mg/mg VSS-day, b = 0.1/day, Y=0.50 g VSS/g substrate, fd=0.8, and Xa=1,500 mg VSS/l. If the reactor was designed with a safety factor of 30, what is its design fs value.
An effluent stream sample (500 mL) from a metal-working facility contains 0.52 g nickel sulphate. (i) What is the nickel concentration of this effluent stream (in mg/L)? (ii) Would you regard this concentration as suitable for discharge to the local sewage system? (iii) How much total nickel (in kg) leaves the facility per year in this stream if ~1 ML of effluent is produced?
A waste-holding lagoon situated near the main plant of a chemicalcompany receives sludge on a daily basis. When the lagoon is full, it is necessary toremove the sludge to a site located 4.95 kilometers from the main plant. Currently,when the lagoon is full, the sludge is removed by pumping it into a tank truck andhauling it away. This process requires the use of a portable pump that has an initialcost of $800 and an 8-year life. The company can operate the pump at a cost of $25per day, but the truck and driver cost $110 per day.Alternatively, the company has a proposal to install a pump and pipeline to theremote site. The pump would have an initial cost of $600, a life of 10 years, and acost of $3 per day to operate. (a) If the MARR is 15% per year and the pipeline willcost $3.52 per meter to construct, how many days per year must the lagoon requirepumping to justify construction of the pipeline? (b) The lagoon was pumped40 times last year. Which alternative would have been cheaper?…
A wastewater treatment plant has been operating with the following specifications:flow rate = 7,630 m3/d, aeration tank volume = 1,270 m3, mixed liquor volatile suspendedsolids = 2,600 mg/l. The soluble BOD in the plant influent used to be 133 mg/l, but hasrecently changed to 222 mg/l. What is the new MLVSS this plant should use to maintain thesame F/M ratio as before? (Ans. Xnew = 4,340 mg MLVSS/l)
You have been treating a wastewater with bacteria that have the following kinetic coefficients: k= 16 mg BODL/mg VSS-day Ks = 10 mg BODL /l b =0.2/day Y = 0.35 mg VSS/mg BODL fd = 0.8A genetic engineer comes to you and claims he can “fix” your bacteria so they are more efficient. The fixed bacteria will have b=0.05/day and fd = 0.95, while all other coefficients are the same. Using a chemostat reactor, you were successfully using a safety factor of 30, and you plant to continue doing so. How would the genetic engineers plan affect your sludge production and oxygen requirements? Assume X0=0, S0=200 mg BODL/l). In what ways are the new bacteria more efficient?
1) a)Calculate f and L of a rotary dryer for a kaolin plant to dry 20 tph pressure filtered kaolin containing 22% H2O. Dry kaolin moisture content must not be more than 5% H2O. b)Estimate the energy consumption as kWh and its cost (1 kWh = 14 ¢)