What is process of activated sludge process?

The activated sludge process in the treatment of wastewater involves blowing oxygen or air into raw, unsettled sewage. This process smashes the solids. The sewage is bubbled, and sewage liquor is discharged into an activated sludge chamber.

What is activated sludge process explain with diagram?

In activated sludge process wastewater containing organic matter is aerated in an aeration basin in which micro-organisms metabolize the suspended and soluble organic matter. Part of organic matter is synthesized into new cells and part is oxidized to CO2 and water to derive energy.

What do you understand by activated sludge?

Activated sludge is a thick soft substance used for removing pollutants from waste water by a biological reaction that involves oxygen. The activated sludge is then separated from the treated wastewater and disposed of or returned to the process as needed.

What are the types of activated sludge process?

7 Main Types of Activated Sludge Process | Waste Management

• Type # 1. Conventional Activated Sludge Process:
• Type # 2. Tapered Aeration Process:
• Type # 3. Step Aeration Process:
• Type # 4. Contact Stabilization Process:
• Type # 5. Complete Mix Process:
• Type # 6. Modified Aeration Process:
• Type # 7.

Why recirculation is done in activated sludge process?

So, one reason for sludge recirculation is to control biomass distribution. And RAS flow is critical to clarifier performance. There are a couple of methods that are implemented. One of them is the constant flow method.

How does activated sludge get produced during sewage treatment explain how this sludge is used in biogas production?

(a) As the BOD of sewage or waste water is reduced to about 10-15\%, the effluent is passed into a settling tank where the bacterial flocs undergo sedimentation. The sediment is called activated sludge.

What is activated sludge process Slideshare?

• In activated sludge process wastewater containing organic matter is aerated in an aeration basin in which micro-organisms metabolize the suspended and soluble organic matter. matter. • Part of organic matter is synthesized into new cells and part is oxidized to CO2 and water to derive energy.

How is activated sludge formed Class 7?

(a) When the BOD of sewage or waste is reduced significantly, the effluent is then passed into a settling tank where the bacterial ‘flocs’ are allowed to sediment. This sediment is called activated sludge. (b) A small part of the activated sludge is pumped back into aeration tanks to serve as the inoculum.

What happens to the activated sludge?

A small part of the activated sludge is pumped back into the aeration tank to serve as the inoculum. The remaining major part of the sludge is pumped into large tanks called anaerobic sludge digesters. Activated sludge is obtained after aeration, settling and filtration using sand beds.

What is MBR process?

‘Membrane bioreactor’ (MBR) is generally a term used to define wastewater treatment processes where a perm-selective membrane, eg microfiltration or ultrafiltration, is integrated with a biological process − specifically a suspended growth bioreactor.

Which are the three ingredient in activated sludge system?

Which are the three ingredients in activated sludge systems? Explanation: The cells need oxygen for their metabolism, air is injected from the bottom of the aerator. The water is well agitated by the rising bubbles and creates good contact between the three ingredients: cells, sewage and oxygen.

How is activated sludge produced during sewage treatment?

The effluent is passed into a settling tank once the BOD is reduced. The flocs are now allowed to sediment. This sediment is called the activated sludge. A small amount of the activated sludge is pumped back to the aeration tank where it acts as an inoculum.

Why is the activated sludge process called so?

Activated sludge process was developed in England in 1914 and was so named because it involved the production of an activated mass of microorganisms capable of aerobically stabilizing the organic content of a waste water.

What does activated sludge mean?

Activated sludge. The activated sludge process is a type of wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa .

How does activated sludge work?

How Activated Sludge Works. The activated sludge is aerated to dissolve oxygen which allows the organic matter ( BOD ) to be utilised by the bugs. The organic matter, or food, sticks to the activated sludge. The oxygen dissolved in the water allows the bugs to use the food (BOD) and also to change the ammonia to nitrate.

How do you avoid sludge bulking in activated sludge process?

To avoid sludge bulking some of the flow that enters the reactor can be bypassed , recycle ratio can be increased , lime or soda can be added to the reactor or the re-aeration rate increased. How do you increase SVI in activated sludge?