Q2) Find the diameter of a single stage trickling filter of influent BOD 180 mg 1 and effluent BOD 40 mg/l, wastewater flow 10000 m/d, circulation ratio (1)-2.0 and depth 2.0 m.
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- QUESTION 26 Calculate Peak Wet Weather Flow given the following information about a wastewater treatment plant: Average Dry Weather Flow 7,700 m3/day Peak Factor 2.74 Infiltration 15 % Peak Dry Weather Flow =PF X ADWFb) Determine the concentration of the effluent BOD, for the two-stage trickling filter described below The wastewater temperature is 17 C. Assume the NRC equations apply. Design flow = 0.0s09 m/s Influent BODS (after primary treatment) = 260 mg/L Diameter of each filter = 24.0 m Depth of each filter =1.83 m Recirculation flow rate for each filter = 0.0594 m/s %3DQuestion- A circular primary clarifier processes an average flow of 3000 m³/d of municipal wastewater. The overflow rate is 25 m³/d. Find the diameter of clarifier.
- Q4: A two stage trickling filter is to treat a wastewater flow of 125 m/hr with BOD 200 mg/ following primary treatment and have circulation ratio (r) 2.0, with a diameter of 25 m and depth of 2 m for each stage. Find the BOD removal efficiency (%) for each stage. Assume V=V and F=F.Seatwork No. 4 A residential area of a city has a population density of 15000 per km2 and an area of 1800000 m2. If the average sewage flow is 225 L/cap-day. Use the maximum sewage flow in the design which has 50% increase from the average flow. The Infiltration rate is 0.055 cu.m. per second and the consider leakage of 0.025 cu.m. per second. Estimate the maximum rate of flow in m3/s. Seatwork No. 5 The present population is 28,000 and the average water consumption is 16,000,000 L/day. If the Maximum sewage flow is 225 L/cap-day and the Infiltration rate is 0.055 cu.m. per second and the leakage of 0.025 cu.m. per second. Use the population data for year 2000 is 10000. Estimate the maximum rate of flow in m3/s after 5 years.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.
- A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 180 m³/m².d. The design capacity of the waterworks is 0.40 m³/s. The maximum surface per filter is limited to 60 m². Calculate the followings; i ii. iii. Total surface area required The number of filters, n The surface area for each filter, a IV. Normal filtration rate, v i. Determine the total surface areal required A = (Q/A) ii. Determine the number of filters, n iii. Determine the surface area for each filter is a x 8 Use dimensions as 8 iv. Determine the normal filtration rate. v = Q/A = (0.40 m³/s) / ( X m³/m².d. ) X Area m² n use m² = = a =A primary circular clarifier for a municipal wastewater treatment plant is to be designed for an average flow rate of 3570 m³/d. Given the surface loading rate is 35 m³/day.m² and assume that the peak flow factor is 2.5. Calculate: 1) Peak Flow Rate 2) Surface Area of the Clarifier 3) Diameter of the clarifierAn average wastewater flow of 20 000 m³ / day is to be treated by a clarifier with surface overflow rate (SOR) of 25 m/ m?.day and hydraulic retention time of 3 hours. Determine: Diameter of the clarifier (use two clarifiers) Depth of the clarifier.
- Q4) (25 marks) Assume suitable design criteria, compute the net and overall dimension of an efficient shape you choose for settling tank for wastewater collected from a two compound with 20 dwelling of 10 floors and 2 flats in one floor. Assume 5 persons live in each flat and each one produce 400 L of wastewater per day.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?Q/ 2: A city discharges 115000 m3/d of wastewater into a stream whose minimum rate of flow is 8.5 m3/s. The velocity of the stream is about 3.2Km/hr, the temperature of the wastewater is 20 oC and that of the stream is 15 oC. The BOD5 at 20 oC of the wastewater is 200mg/l and that of the stream is 1mg/l. The wastewater contains no dissolved oxygen but the stream is 90% saturated upstream of the discharge. At 20 oC k1 is estimated to be 0.3 day-1, and k2 is 0.7 day-1. Determine the critical oxygen deficit and its location, also estimate BOD5 at 20 oC of the sample taken at the critical point. Use temperature coefficient of 1.135 for k1 and 1.025 for k2, also plot the dissolved oxygen sag curve