Design rapid sand filters for a water treatment plant to treat a flow rate of 25...

Design rapid sand filters for a water treatment plant to treat a flow rate of 25 mgd. Use 1.5 for a peak factor. Consider the location of overflow troughs, freeboard, and pressure head of water. Assume that the length of the filters is 2 times the width and that the filtration rate is 3 gpm/ft2. Assume anthracite over sand with 1 ft gravel under media, top of water level during filtration is below troughs, and a 3 ft head drop between bottom of rapid sand filters (bottom of gravel) and top of water in chlorine contact basin.

a. Determine how many parallel filters should be used

b. Design the dimensions (width, length, depth) for one rapid sand filter in the process train and draw features (media, gravel, underdrain, overflow troughs, freeboard, pressure head, and water level in chlorine contact basin) and draw a simple diagram of the rapid sand filter.

c. Using a backwash rate of 12 gpm/ft2 for 15 minutes, what is the volume of water used in each backwash?

solve all with clear steps please

Expert Solution

Ally Wells answered 11 months ago

rapid sand filter will be constructed for average flow rate of 0.06 m3 / h. Design...

rapid sand filter will be constructed for average flow rate of 0.06 m3 / h. Design (...find dimensions...) and draw the filter.

A water treatment plant is designed for a constant flow rate of 3 MGD. The flocculation...

A water treatment plant is designed for a constant flow rate of 3 MGD. The flocculation system consists of three tanks, each having a water depth of 10 ft and an average hydraulic residence time (HRT) of 30 min. (a) Determine the dimension of each tank (i.e., width and length). (b) Determine whether the flow through velocity is acceptable. (c) The plant is planning to take one tank out of service for maintenance. Determine the increase in power requirement...

A new wastewater treatment plant was built to treat the wastewater flow 800,000 gpd. The capital...

A new wastewater treatment plant was built to treat the wastewater flow 800,000 gpd. The capital cost to build the wastewater treatment plant was $6,000,000. The annual operation and maintenance costs of operating the plant is $700,000/year. Estimate the cost of treating 1000 gallons of wastewater ($/1000 gallon). Assume the design life as 20 years and interest rate of 4%.

The Iowa City Water Treatment Plant and the University of Iowa Water Treatment Plant remove calcium...

The Iowa City Water Treatment Plant and the University of Iowa Water Treatment Plant remove calcium hardness (Ca2+) by precipitating (making) CaCO3(s). If, after establishing equilibrium with CaCO3(s), the dissolved Ca2+ concentration is 10 mg/L and the pH is 10.5. a. What is the CO32- concentration in mol/L? b. What is the HCO3- concentration in mol/L? c. What is the alkalinity in mg/L as CaCO3?

The Water Treatment Plant and the University Water Treatment Plant remove calcium hardness (Ca2+) by precipitating...

The Water Treatment Plant and the University Water Treatment Plant remove calcium hardness (Ca2+) by precipitating (making) CaCO3(s). If, after establishing equilibrium with CaCO3(s), the dissolved Ca2+ concentration is 10 mg/L and the pH is 10.5. a. What is the CO32- concentration in mol/L? b. What is the HCO3- concentration in mol/L? c. What is the alkalinity in mg/L as CaCO3?

Design a set of activated sludge aeration tanks. The flow rate to treat is 5.6 MGD...

Design a set of activated sludge aeration tanks. The flow rate to treat is 5.6 MGD and the BOD concentration is 150 mg/L. The design solids concentration (X) at steady-state is 2,000 mg/l. The design MCRT is 7 days. The kinetic coefficients are as follows: K = 2 g BODg cells⋅d, Ks = 25 BOD/L, Kd = 0.06 day-1, Y = 0.5 g BODg cells⋅d. The influent ammonia concentration is 40 mg/l and nitrification is needed. It takes 1400 ft3of...

The Wilson Wastewater Treatment Plant currently provides primary treatment for a flow rate of 2500 m3/day....

The Wilson Wastewater Treatment Plant currently provides primary treatment for a flow rate of 2500 m3/day. The effluent from the primary tank has a soluble BOD5= 240 mg/L. You need to design an activated sludge treatment to update the plant. The secondary effluent standards to meet are 25.0 mg/L BOD5 total (suspended and soluble BOD) and 30 mg/L suspended solids. Use the following assumptions: Target soluble BOD5 in the effluent of the secondary treatment is 2.5 mg/L. Growth constants can...

A water treatment plant has 6 settling tanks that operate in parallel (the flow gets split...

A water treatment plant has 6 settling tanks that operate in parallel (the flow gets split into six equal flow streams), and each tank has a volume of 600m^3. If the flow to the plant is 10mgd, what is the retention time in each of the settling tanks? If, instead, the tanks operated in series (the entire flow goes first through one tank, then the second, and so on), what would be the retention time in each tank?

A rapid mixing basin is to be designed for a drinking water coagulation plant with a...

A rapid mixing basin is to be designed for a drinking water coagulation plant with a 5 MGD flow. The geometry of the basin is square with a depth equal to 1.5 times the width. The velocity gradient is 950 s·1 with a detention time of 25 s. Calculate a) The basin dimensions using minimum increments of 1" b) The input hp required c) The impeller speed with six flat blades employed and a baffled tank given that the impeller...

Q4. You are working in a waste water treatment plant, once your treatment plant receives sewage...

Q4. You are working in a waste water treatment plant, once your treatment plant receives sewage water with more colloidal or dissolved organic materials. As an Engineer what type of treatment will you prefer for this sewage water? Justify and explain the method selected by you.

Question