What is used to control filamentous organisms?

Filamentous bacteria can be controlled by treating the return sludge with chlorine or hydrogen peroxide to selectively kill filamentous microorganisms. Chlorine concentration should be 10-20 mg/L (concentrations greater than 20 mg/L may cause deflocculation and formation of pin-point flocs).

How can filamentous bacteria be controlled?

Ingenuity To The Rescue Chlorine and hydrogen peroxide have been used success- fully to selectively kill filamentous bacteria. 3 Chlorine is the most widely used toxicant, as it is relatively inexpensive and readily available. A highly concentrated chlorine solution (0.5 to 1.0 percent) has been shown to be successful.

What are the examples of filamentous bacteria?

The most commonly encountered filamentous bacteria causing bulking problems belong to the Alphaproteobacteria (‘Nostocoida’-like), the Gammaproteobacteria (Thiothrix and type 021N), the Actinobacteria (Candidatus’Microthrix’, Mycolata) and the Chloroflexi (types 1851, 0041 and 0092).

What method is used to identify filamentous bacteria?

Smears are useful for staining only and are particularly useful when identifying filamentous bacteria. The most commonly used staining techniques are simple staining and differential staining.

What causes filamentous growth?

The possible causes of filamentous growth are identified, including long retention times of solids, low substrate concentration in the liquid phase, high substrate gradient within the granule, dissolved oxygen deficiency in the granule, nutrient deficiency inside granule, temperature shift and flow patterns.

What does filamentous bacteria look like?

Filamentous bacteria are long strands of bacteria growing end to end, resembling strands of hair or spaghetti, which interlock with each other to form a mesh. The types of filamentous bacteria present can indicate certain things about a wastewater system, like nutrient availability or dissolved oxygen concentration.

Which of these is an example of filamentous algae?

Spirogyra, Anabaena, Oscillatoria, Lyngbya, Pithophora spp., etc.

What do you mean by filamentous bacteria?

What causes filamentous bacteria in wastewater?

Filamentous bacteria are normal components of activated sludge biomass. Usually this is caused by an excessive and uncontrolled growth of different types of filamentous bacteria, which interfere with the concentration settling of activated sludge in wastewater treatment plants.

What is an example of a filamentous alga?

Spirogyra is an example of filamentous algae.

Where is filamentous bacteria found?

Filaments are most prevalent in activated sludge systems but are typically found in low concentrations in aerated stabilization basins as well. The types of filamentous bacteria present can indicate certain things about a wastewater system, like nutrient availability or dissolved oxygen concentration.

Which one is a filamentous algae?

Diatoms are microscopic unicellular, colonial, or filamentous algae found in marine and freshwater ecosystems as well as in brackish water, soil, or even on moist surfaces.

Why is the presence of filamentous bacteria important?

The presence of some filamentous bacteria is benefitial in floc formation to a biomass. The filaments connect to each other and form a mesh that is crucial for floc formation. Filamentous bacteria serve as a base of the structure on which other bacteria can attach and form flocs which are important in flocculation and settling.

Why are filamentous bacteria useful in activated sludge?

Since a certain amount of filamentous bacteria is useful in the activated sludge process, lack of it may cause flocs with good settling abilities but which leave behind a turbid effluent.

Which is better flocs with or without filamentous bacteria?

Jin et al. (2003) found that flocs containing high quantities of filamentous bacteria settled faster than flocs without filamentous bacteria. This indicates that the excessive proliferation of filamentous bacteria does not necessarily lead to sludge bulking.

What can you use to kill filamentous bacteria?

Filamentous bacteria can be controlled by treating the return sludge with chlorine or hydrogen peroxide to selectively kill filamentous microorganisms. Chlorine concentration should be 10-20 mg/L (concentrations greater than 20 mg/L may cause deflocculation and formation of pin-point flocs).

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