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Consider the following statements regarding sand as filter material. i. It should be free from clay or silt ii. Organic matter should be present in the sand iii. It should be nonuniform Which of the above statement is/are correct?

Consider the following statements regarding sand as filter material. i. It should be free from clay or silt ii. Organic matter should be present in the sand iii. It should be nonuniform Which of the above statement is/are correct? Correct Answer i only

Sand used as a filter material should be free from clay, silt, organic matter or other impurity. It should be uniform and of proper size.

Related Questions

Consider the following statement. i. The penetration of suspended matter is deep in the slow sand filter ii. The penetration of suspended matter is superficial in the rapid sand filter iii. Coagulation is not required in the slow sand filter Which of the above statement is/are correct?
Consider the following statements in respect of slow sand filter and rapid sand filter: 1. The two filters differ in respect of the standards regarding the non-uniformity of the sand used in their filtering media. 2. The two filters do not differ in respect of the effective size of the sand used in them. 3. The two filters differ in respect of their respective under-drainage system. 4. The two filters differ in respect of their respective rate of filtration. Which of the above statements are correct? 
Consider the following statement. i. The slow sand filter is not efficient in removing turbidity ii. The slow sand filter has a high initial cost iii. Skilled supervision is required in slow sand filter Which of the above statement is/are correct?
Consider the following statement. i. Slow sand filter is not flexible in variation in demand ii. The rapid sand filter is flexible in fluctuations in demand iii. The method of cleaning of a slow sand filter involves agitation and back-washing Which of the above statement is/are correct?
The following are certain operating problems of a rapid sand filter: 1. Sand depth should never be depleted by more than 10 cm. 2. Air binding results due to development of negative head and formation of air bubbles in the filter sand. 3. Water softening with lime-soda leads to incrustation of sand. 4. Bumping of filter bed is caused due to negative head. Which of the above statements are correct?
Consider the following statements: 1. IS 3583 refers to Burnt Clay Paving Bricks. 2. IS 5779 refers to Burnt Clay Soling Bricks. 3. IS 3952 refers to Burnt Clay Hollow Bricks. 4. IS 2222 refers to Burnt Clay Lay Bricks. Which of the above statements are correct? 
Consider the following statement regarding the depth of sand of the rapid gravity filter? i. It should be checked against breakage of floc ii. The sand depth should lie between 100-200cm iii. The floc should be attached through the sand bed Which of the above statement is/are correct?
Consider the following statements regarding matter. 1. Matter is made up of small particles 2. The forces of attraction between the particles in matter are maximum in gases. 3. Evaporation does not cause cooling. 4. The matter around us exists in three states: solid, liquid and gas, Which of the statements given above is/are correct?
Consider the following statements: (i) Quicksand is a special variety of sand (ii) Quicksand is not a material but a hydraulic condition. (iii) In nature, quicksand condition is observed usually in coarse silt or fine sand. Which of the above statements are correct?
A rotary drum filter with 30% submergence is used to filter concentrated aqueous slurry of calcium carbonate containing 15lb of solids per cubic foot of water. The pressure–drop is 2011Hg. If the filter cake contains 50% mixture (wet basis), calculate the filter area required to filter 10 gal/min of slurry. The filter cycle time is 5 min. The specific cake resistance depends on the pressure–drop as: α (ft/lb) = α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance.