Bissoy.com
Doctors Medicines MCQs Q&A

Consider the following statements regarding activated sludge process: 1. Industries prefer activated sludge process as it requires less space, does not produce obnoxious odours and requires less time for waste water treatment compared to trickling filter. 2. It requires skilled supervision 3. Biological treatment is enhanced because shock loadings are eliminated. Which of the above statements are correct?

Consider the following statements regarding activated sludge process: 1. Industries prefer activated sludge process as it requires less space, does not produce obnoxious odours and requires less time for waste water treatment compared to trickling filter. 2. It requires skilled supervision 3. Biological treatment is enhanced because shock loadings are eliminated. Which of the above statements are correct? Correct Answer 1 and 2 only

Biological wastewater treatment: The biological process of sewage is a secondary treatment involving removing, stabilizing, and rendering harmless very fine suspended matter, and solids of the wastewater that remain even after the primary treatment has been done.

The major process of secondary or biological treatment are:

  • Activated Sludge Process
  • Trickling Filters

 

Activated sludge process:

  • The essential features of activated sludge process are an aeration stage, solids- liquid separation following aeration, and a sludge recycle system.
  • Wastewater after primary treatment enters an aeration tank where the organic matter is brought into intimate contact with the sludge from the secondary clarifier.
  • It requires less space, does not produce obnoxious odours and requires less time for wastewater treatment.
  • It requires skilled supervision

 

Trickling filters:

  • The secondly commonly used biological waste treatment process is the trick­ling filter method. Trickling filters are also called percolating filters.
  • It has good adaptability to handle peak shock loads and the ability to function satisfactorily after a short period of time.

 

Related Questions

Consider the following statements in respect of flow equalization in a wastewater treatment plant: 1. Biological treatment is enhanced because shock loadings are eliminated or minimized. 2. Flow equalization is an attractive option for upgrading the performance of overloaded treatment plants. 3. Inhibiting substances can be diluted and pH can be stabilized. 4. Thickening performance of primary sedimentation tanks following grit removal is improved. Which of the above statements are correct?
Consider the following statements with reference to the mixing of industrial waste water with domestic waste water: 1. The industrial waste water can be mixed with domestic water when it has higher BOD. 2. The industrial waste water can be mixed with domestic water when the pH value of industrial waste water is highly alkaline. Which of the above statements is/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?
In the following diagram, the triangle represent 'People who prefer strawberry icecream', the circle represents 'People who prefer vanilla icecream' and the rectangle represents 'People who prefer chocolate ice cream'. How many people prefer both, strawberry and vanilla ice cream, but do not prefer chocolate ice cream?
In the following question, two statements are numbered as A and B. On solving these statements, we get quantities A and B respectively. Solve both quantities and choose the correct option. Quantity A: 20% of students prefer to speak both English and Hindi while 40% of students prefer to speak Hindi and 55% of students prefer to speak English. 1300 students don’t prefer to speak both English and Hindi. Find the difference between the number of students who speak only English and only Hindi. Quantity B: 10 men can complete the work in 20 days while 30 women can complete the work in 40 days. If 8 men and 30 women started the work and they work for 8 days then left the work. The remaining work will be completed by a certain number of women in 57.6 days. Find the number of women who completed the remaining work.
In a village 50% of the villagers produce rice, 40% of the villagers produce apples and 50% of the villagers produce vegetables, 20% of the villagers produce rice and apples both, 25% of the villagers produce apples and vegetables both, 20% of the villagers produce rice and vegetables both and 10% of the villagers produce all three. Find the percentage of villagers who do not produce anything.
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.
Consider the following statements as regards a Septic Tank: 1. The size required is large and uneconomical when serving more than roughly 100 persons. 2. It can remove around 90% of BOD and 80% of suspended solids. 3. As compared to the sludge holding of a plain sedimentation tank, a septic tank can hold about 90% less of sludge volume. 4. Frequent removal of sludge is not required. Which of the above statements are correct?
Consider the following tertiary treatment methods for treatment of waste water: 1. Ion-exchange method 2. Reverse osmosis 3. Chemical oxidation method 4. Activated sludge process Which of the above methods are correct ?
Which of the following type of waste water treatment process is used for treating waste water or industrial waste water using aeration and biological flocs?