What is sludge age in activated sludge process?

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What is sludge age in activated sludge process?

The sludge age of an activated sludge process can be calculated by dividing the pounds of suspended solids or MLSS in the aeration tanks by the pounds of suspended solids that enter the aeration tanks (Equation I. 10). The sludge age is Equation I. 8 divided by Equation I.

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.

Is activated sludge good?

The activated sludge process is an integral process used to treat wastewater. Air or oxygen is blown into raw sewage. It is most effective for large volumes of water. Wastewater is mixed and aerated in a special tank.

What activated sludge means?

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 is a good sludge age?

three to fifteen days
Optimum MLSS concentrations should be determined experimentally for each plant. – A sludge volume index of about 100 and a sludge age of three to fifteen days are normal for most plants.

Why is sludge age important?

Generally, the better the effluent and waste sludge quality required from the system, the longer the sludge age, the larger the biological reactor and the more wastewater characteristics need to be known.

How do you maintain activated sludge?

To control activated sludge, you need to “have a handle” either on aeration, sludge-wasting or return-sludge flow. Aeration-rate adjustment is probably the simplest way to go. It involves, however, more than measuring aeration-basin dissolved oxygen (DO) concentration once each day.

What is the advantages and disadvantages of activated sludge plant?

Advantages of activated sludge process 1) Cost of installation is low. 2) This process requires a small area of land. 3) Loss of head through the treatment plant is comparatively low. 4) There is no fly and odour nuisance.

Is activated sludge hazardous?

US Department of Transportation (DOT) under 49 CFR 172.101 does not regulate WWTP Activated Sludge as a hazardous material. All federal, state, and local laws and regulations that apply to the transport of this type of material must be adhered to.

What is a good SVI in wastewater?

SVI = 100 to 200 mL/g. Most activated sludge plants seem to produce a clear, good-quality effluent with an SVI in this range.

What is the principle of activated sludge process?

The activated sludge process uses microorganisms to feed on organic contaminants in wastewater, producing a purified effluent. The basic principle behind all activated sludge processes is that as microorganisms grow within metabolizing soluted organic material. They form particles that clump together.

Does activated sludge remove bod?

Aeration is used to operate activated sludge process units and is perhaps the most frequently used process to remove biochemical oxygen demand (BOD) from wastewater.

Which bacteria play important role in activated sludge treatment?

Activated sludge (AS) is composed of aerobic and anaerobic microorganisms such as bacteria, archaea, fungi, and protists. It is capable of degrading organic compounds, including petroleum products, toluene, and benzopyrene (Seviour and Nielsen, 2010).

How is activated sludge produced?

(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.

What is required to keep activated sludge suspended?

To maintain aerobic conditions and to keep the activated sludge suspended, a continuous and well-timed supply of oxygen is required. It consists of flocs of bacteria, which are suspended and mixed with wastewater in an aerated tank.