Determine the surface dimensions and number of filters required to treat 23,000 m³/d if the rate of filtration is not to exceed 8 gallons per minute/square feet (gpm/sf).

A WTP is designed to treat 48,000 m3 / day. For filtration 12 RSFs are used, each filter is designed with 2 troughs of a square cross - sectional area. The filtration rate is 160 m / day and the backwash rate is 864 m / day. Find 1) Dimensions of each filter, Land W (m) with or without washing? Also filter depth? 2) Dimensions of each trough, y and b (m) and gullet? 3) Volume of water (m3) to wash 2 filters at the same time for 5 minutes?

Distinguish the domestic and industrial wastewater. Comment whether industrial wastewater discharge is prohibited or allowed to pass through the sewage treatment plan

Assume suitable design criteria, design a screen chamber for the maximum influent of domestic wastewater flow of 3750 m*/hr and the ratio of D:B equal 1:1.5.

a) Determine the total GMF surface area required to filter a volumetric flow rate of 10.0 MGD at a filtration rate of 4.0 gpm/ft2 . Divide the total surface area into an appropriate number of filter cells and determine the planar dimensions if square cells are used. Determine the percentage of the filtered water that will be used for backwashing under the following conditions,  Each filter cell is backwashed once every 24 hours • Backwashing rate of 20.0 gpm/ft2 • Each cell is backwashed for a duration of 10 minutes Also determine the filtration rate through the remaining filter cells when one cell is removed from service for backwashing.

A rapid sand filter is required to treat the flow of 0.50 m³/sec. The filtration rate is 120 m³ per day per m² of filter area. Each filter is washed for 5 minutes every 24 hours. at a wash rate of 15 mm per second per m² of filter area. The filter remains out of operation for a total interval of 30 minutes per day. Calculate the minimum number of filters required if the area of each filter is 50 m².

City of Longview, TX Cherokee Water Treatment Plant 1. Evaluate the treatment operations with respect to comon water treatment parameters (levels of treatmnet, softening, use of coagulants, flocculation, sedimentation, and filtration). 2. Is there a disinfection system present? What disinfection agents are used for the system? Why? Concerns about this form of disinfection? 3. Is a sludge seperation system used by the facility? Which one? How effective is it? What happens to the sludge? Is there treatment of the sludge pior disposal?

A wastewater treatment lagoon is being designed to accommodate an input flow of 0.1m^3/s containing a non-conservative pollutant at a concentration of 25.0 mg/L. The pollutant has a reaction rate of 0.25/day. The effluent from the lagoon must have a pollutant concentration of less than 10.0 mg/L to remain within permit limits. Assuming complete mixing, how large must the lagoon be?

Design a rapid mono-media sand filter for a plant that has a design flow rate of 120 MGD. Filter Boxes Required:a) How many filter boxes are required for “on-line” filters?b) How many additional filter boxes are required to accommodate “off-line”filters?c) What is the total number of filter boxes needed by your plant?

design 4 filter with 2 troughs of a square cross-sectional area to treat 2000 m³/hr using average filtration rate and backwash rate criteria, also calculate the dimensions of each trough, y and b (m) and gullet.