Table of Contents
How can filamentous bacteria be reduced?
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).
What is the common problem with activated sludge?
Filamentous bulking and foaming are common and serious problems in activated sludge operation, affecting most activated sludge plants at one time or another. Filamentous bulking is the number one cause of effluent noncompliance today in the U.S.
How do you identify a filamentous bacteria?
Filament shape is one of the characteristics often used to help identify filamentous bacteria. Some filaments are smoothly curved, some are straight and others are simply irregularly shaped. Filaments can range in size from 0.8 to 5 μm in width and from 5 to > 500 μm in length.
How is filamentous treated?
Herbicide Control of Filamentous Algae Herbicide control is a great option for Filamentous Algae because you can literally apply the herbicide and then sit back and let it do its work. Most herbicides can control Filamentous Algae throughout the season and only needs to be applied once a year.
How can filamentous algae be prevented?
This can be done by reducing fertilizer applications near the pond, maintaining septic systems properly, redirecting nutrient-rich runoff away from the pond, and maintaining vegetative buffer strips around your pond.
How do you fix sludge when bulking?
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.
Which method is good for filamentous bacteria and Moulds and why?
A quantitative method for measuring the mass concentration of the filamentous bacterium Type 021N in activated sludge using fluorescence in situ hybridization.
How do I stop sludge bulking?
How can you improve settling in activated sludge?
Excess organic load can be remedied by reducing the waste-activated sludge rate by an amount less than 10 percent per day, to return to proper loading parameters and increase the returned activated sludge rates. About a 30 percent level of settled solids in the clarifier should be established and maintained.
How are filamentous bacteria isolated?
Narrow and short filaments or filaments scarce in the activated sludge may be concentrated by centrifugation. Another method for selective isolation of filamentous bacteria is micromanipulation with special microtools under a microscope (Kämpfer, 1997).
What can I use for filamentous algae?
Copper Sulfate or “blue stone” is probably the most commonly used algal treatments because of its availability and low cost. Copper sulfate comes in several forms depending on how finely it is ground.
How can filamentous algae be controlled?
Filamentous algae can be controlled by physically removing large floating clumps with a rake. Mechani- cal removal is an ongoing activity during the growing season due to the algae’s persistent fast growth. Algae that has been removed can be piled for composting or used in a garden as mulch.
How do you get rid of filamentous green algae?
Cutrine Plus is a copper-based Algaecide and herbicide that is labeled to control Filamentous Algae. It is easy to mix and can be used as a surface spray to kill floating algae. Before mixing, you will need to determine the size of the pond in acre-feet to see how much Cutrine Plus you need to apply.
How can filamentous bacteria be controlled?
Which is the best technique used to measure the growth of filamentous organisms?
dry weight. Which is the best technique to use to measure the growth of filamentous organisms? direct microscope count.
What causes bulking?
Abstract. Sludge bulking is the most common solids settling problem in wastewater treatment plants, which is caused by the excessive growth of filamentous bacteria extending outside the flocs, resulting in decreasing the wastewater treatment efficiency and deteriorating the water quality in the effluent.
What is an example 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 are filamentous organisms?
filamentous organisms (fill-uh-MEN-tuss) Organisms that grow in a thread or filamentous form. Common types are Nocardia, Thiothrix, and Actinomycetes.