5. Membrane filtration is increasingly being used in small water treatment facilities instead of gravity filtration. Backwash is an essential phase of operating a filter and applies to both the gravity filters and the membrane filters. Using a typical plot of "run time versus headloss buildup" provide a graphical comparison between the backwash cycle in a dual media gravity filter and that of a membrane filter. Use the same scale in describing the run time (20 ts)..

5. Membrane filtration is increasingly being used in small water treatment facilities instead of gravity filtration. Backwash is an essential phase of operating a filter and applies to both the gravity filters and the membrane filters. Using a typical plot of "run time versus headloss buildup" provide a graphical comparison between the backwash cycle in a dual media gravity filter and that of a membrane filter. Use the same scale in describing the run time (20 ts)..

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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• An average operating data for conventional activated sludge treatment plant is as follow:- • Wastewater flow =35000m³/d, volume of aeration tank =10900m2, influent BOD to aeration tank=162.5mg/l, effluent BOD=20mg/I, mixed liquor suspended solids32500mg/l. Based on the information above determine: - Aeration period, F/M, BOD load ,Percentage efficiency of BOD removal.
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.
The results of a jar test on a surface water supply sample revealed that the optimum dose of alum (Al2(SO4)3.14H2O) as coagulant is 17 mg/L. Furthermore, the water has total alkalinity = 50 mg/L as CaCO3; pH = 7.8; and residual turbidity at optimum alum dose = 4 NTU. The water treatment plant has a mean flow of 10m3/hour. Determine: The kg of alum per year needed in the operation of the plant. The residual alkalinity in the sample, following the addition of alum at optimum dose. Solve parts (a) and (b) if instead of alum, ferric chloride (FeCl3) were used as coagulant. Assume the numerical jar test results are the same as those with alum.
A wastowater sample of 100 ml. was filtered through the filter paper and the filtered wator was collected in a beaker. Based on the information provided in Table 1, calculato total solids, suspended solids, dissolved solids in wastowater (mg/1.). Table 1: Description Weight of filter paper (gm) Weight of tilter paper +solids (gm) after oven dry at 105 'C Weight of filter paper +solids (gm) after oven dry at 105 C Weight of beaker (gm) Weight of beaker + water after oven-dried at 105 "C (qm) Weight 0.05 0.1 7.76 50 51.5 O Suspended solids - 76.6 mg/; dissolved solids 15 mg/ and Total solids 91.6 mg/ Suspended solids 86.6 mg/L; dissolved solids - 15 mg/L and Total solids - 101.6 mg/ Suspended solids - 76.6 mg/L; dissolved solids = 10 mg/L and Total solids - 86.6 mg/L Suspended solids 70.6 mg/L; dissolved solids = 25 mg/L and Total solids = 95.6 mgt.
(0 Awastewater sample is being analyzed to determine its BOD content. The sample is diluted in order to perform the test: 295 ml. of distilled water are added to 5 ml of sample to fill the 300 ml BOD bottie. The bottle has an initial dissolved oxygen concentration of 7.9 mg/L After incubating 5 days, the dissolved oxygen concentration is 45 mg/L a. What is the S-day BOD of the wastewater? h. The deoxygenation rate constant, k. is 0.013 day What is the ultin BOD of the wastewater? ) A community normally levies a sewer charge of 20 cents/m' (S0.20/m).
A stack was sampled for 8 minutes. The gas velocity (at stack conditions) through the sampler was 15.0 mfs and the area of the sample probe was 5.07 cmK The net mass of particulates collected was 0,430 grams. a. Calculate the concentration of particulates in the- stack in p.g/m3.b. The temperature in the stack is 300 aF and the pressure is 725 mm Hg. If the total flow rate of gas out of the stack is 190 standard cubic meters per second* calculate the total mass emissions of particulates out of the stack in kg/day.
Q2: A coagulation treatment plant with a flow of 0.5 m/sec is dosing alum at 23 mg/l. No other chemical is being added. The raw water suspended solids concentration is 37 mg/l. The effluent suspended solids concentration is measured as 12 mg/l. The sludge content is 1% and the specific gravity of sludge solids is 3.01. What volume of sludge must be disposed of each day? Based on your result, remark with tolerance to water treatment process.
Envt.
A conventional trickling filter is to reduce BOD of wastewater from 250 mg/1 to 100 mg/1. The allowable loading is 20 MLD. The volume required of this filter is off to nearest integer) m³. (round
a) Calculate the organic loading rate of the trickling filter in lb BOD/day/1000 ft3 with the data below. b) What kind of media filter is used in the above question (2a)? Justify your decision. Diameter of TF 60 feet Depth of Media 15 feet Influent Flow 1.5 mgd Influent BOD 150 mg/L
Determine the dimensions of a high rate trickling filter for the following data: (ii) Recirculation ratio = 1.5 (iv) BOD removed in primary tank = 25%. (i) Sewage flow = 3.0 MLD (iii) BOD of raw sewage = 250 mg/L (v) Final effluent BOD desired = 30 mg/L By what % the diameter of the filter will have to be modified if it is to be designed as a standard rate trickling filter for the above requirement.
Total suspended particulate matter (TSP) concentration in ambient air is to be measured using a high volume sampler. The filter used for this purpose had an initial dry weight of 9.787 gm. The filter was mounted in the sampler and the initial air flow rate through the filter was set at 1.5 m³/min. Sampling continued for24 hours. The airflow after 24 hours was measured to be 1.4 m³/min. The dry weight of the filter paper after 24 hours sampling was 10.283 gm. Assuming a linear decline in the air flow rate during sampling, what is the 24 hours average TSP concentration in the ambient air?