What are the main features of activated sludge process?
The activated sludge process is a multi-chamber reactor unit that uses highly concentrated microorganisms to degrade organics and remove nutrients from wastewater, producing quality effluent. The goal is to maintain aerobic conditions and to keep the activated sludge suspended.
What is the definition of activated sludge in science?
The activated sludge is a process with high concentration of microorganisms, basically bacteria, protozoa and fungi, which are present as loose clumped mass of fine particles that are kept in suspension by stirring, with the aim of removing organic matter from wastewater.
What are the various components of activated sludge system?
There is a large varity of design, however, in principle all AS consist of three main components: an aeration tank, which serves as bio reactor; a settling tank (“final clarifier”) for seperation of AS solids and treated waste water; a return activated sludge (RAS) equipment to transfer settled AS from the clarifier to …
What is the difference between sludge and activated sludge?
This sediment is called activated sludge….
| Primary sludge | Activated sludge | |
|---|---|---|
| (iii) | It does not require aeration | Formation of activated sludge requires aeration |
| (iv) | A lot of decomposition occurs during the formation of primary sludge | Very little decomposition occurs during the formation of activated sludge |
Which are the three ingredients in activated sludge systems?
9. 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.
What is difference between coagulation and flocculation?
Coagulation and flocculation are two separate processes, used in succession, to overcome the forces stabilising the suspended particles. While coagulation neutralises the charges on the particles, flocculation enables them to bind together, making them bigger, so that they can be more easily separated from the liquid.
Why is it called activated sludge?
They aerated the waste-water continuously for about a month and were able to achieve a complete nitrification of the sample material. Believing that the sludge had been activated (in a similar manner to activated carbon) the process was named activated sludge.
What is the purpose of activated sludge?
What is the function of aerator?
Aerators are various mechanical devices used for aeration, or mixing air with another substance, such as soil or water. These devices are used to add oxygen to the water. Aerator may also refer to: Floating surface aerators, used in aerated lagoons.
What are the purpose of aeration?
Aeration brings water and air in close contact in order to remove dissolved gases and to oxidize dissolved metals, including iron, hydrogen sulfide, and volatile organic chemicals (VOCs).
What is activated sludge process?
activated sludge process. noun. : a sewage treatment procedure in which the decomposition of the raw sewage is hastened by the addition to it of biologically active sewage sludge.
Is a completely mixed activated sludge system feasible for wash water treatment?
Borja-Padilla R. et al. (1995a) investigated the feasibility of using a completely mixed activated sludge system for the treatment of wash waters derived from the purification of virgin olive oil in a two-phase extraction process.
What are the disadvantages of activated sludge?
The traditional activated sludge method has simple operation, strong adaptability to sewage of different properties, a high removal rate of dissolved organic matter in sewage, and low construction cost. However, the activated sludge process has poor operation stability, and sludge bulking and sludge loss are prone to occur.
What is a tertiary treatment for sludge?
Tertiary treatment is a chemical method, which is a final stage to disinfect the secondary effluent by making the use of chlorine gas. Variables used in the Activated Sludge Treatment While studying the activated sludge treatment, we must have an idea of the terms given below: