Difference Between Activated Sludge and Trickling Filter

The key difference between activated sludge and trickling filter is that activated sludge is a suspended culture system in which biomass is mixed with the sewage while trickling filter is an attached culture system in which biomass is grown on media and the sewage is passed over its surface.

1. What does a trickling filter do?
2. At what condition activated sludge process is preferred over trickling filter?
3. What does activated sludge mean?
4. What is a trickling?
5. What is trickling filter with diagram?
6. What are the types of trickling filter?
7. Which is the first step in the sludge treatment process?
8. How many types of sludge are present?
9. Is provided after activated sludge process?
10. What is the difference between sludge and activated sludge?
11. How is activated sludge formed?
12. How does activated sludge process work?

What does a trickling filter do?

Trickling filters (TFs) are used to remove organic matter from wastewater. The TF is an aerobic treatment system that utilizes microorganisms attached to a medium to remove organic matter from wastewater.

At what condition activated sludge process is preferred over trickling filter?

Trickling filters re best suited to relatively small streams with low solids content. They don't respond at all well to industrial wastes and are easily poisoned. Activated sludge can be scaled massively as required. With pre-treatment (primary settlement to remove gross solids) they are reasonably robust..

What does activated sludge mean?

Activated sludge refers to a flocculent culture of organisms developed in aeration tanks under controlled conditions, according to WEF. Activated sludge is typically brown in color. Activated sludge is also known as waste activated biosolids or waste activated solids.

What is a trickling?

: a thin, slow, or intermittent stream or movement. Synonyms More Example Sentences Learn More about trickle.

What is trickling filter with diagram?

A trickling filter is a type of wastewater treatment system. It consists of a fixed bed of rocks, coke, gravel, slag, polyurethane foam, sphagnum peat moss, ceramic, or plastic media over which sewage or other wastewater flows downward and causes a layer of microbial slime (biofilm) to grow, covering the bed of media.

What are the types of trickling filter?

TYPES OF TRICKLING FILTERS

• 1 Low Rate Trickling Filter (LRTF) The standard rate or Low rate trickling filters (LRTF) are relatively simple treatment units that normally produce a consistent effluent quality even with varying influent strength. ...
• 2 High Rate Trickling Filter (HRTF) ...
• 3 Roughing Filter. ...
• 4 Two-Stage Trickling Filters.

Which is the first step in the sludge treatment process?

Thickening is usually the first step in sludge treatment because it is impractical to handle thin sludge, a slurry of solids suspended in water. Thickening is usually accomplished in a tank called a gravity thickener. A thickener can reduce the total volume of sludge to less than half the original volume.

How many types of sludge are present?

Explanation: There are two types of sludge present, primary and secondary sludge.

Is provided after activated sludge process?

Activated sludge is also the name given to the active biological material produced by activated sludge plants. Excess sludge is called "surplus activated sludge" or "waste activated sludge" and is removed from the treatment process to keep the ratio of biomass to food supplied in the wastewater in balance.

What is the difference between sludge and activated sludge?

Once the BOD of sewage is reduced significantly, the effluent is then passed into a settling tank where bacterial flocs are allowed to sediment. This sediment is called activated sludge.
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How is activated sludge formed?

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. ... A part of this settled biomass, described as activated sludge is returned to the aeration tank and the remaining forms waste or excess sludge.

How does activated sludge process work?

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.