(1) the flocculent mass of microorganisms, mainly bacteria, that develops when sewage or liquid effluent is aerated; (2) a continuous process in which a liquid effluent is aerated in a tank to reduce the BOD and ammoniacal nitrogen.

Oxygen

Sewage mixed with bacteria and protozoa that thrive and multiply in it and lead to its oxidation (see biological oxygen demand).

A granular, porous, organic fertilizer material derived from sewerage. Aeration, digestion, and drying processes kill all bacteria and weed seeds. Nitrogen is the most valuable component of this product.

A term used to describe sludge that contains microorganisms that break down organic contaminants (e.g., benzene) in liquid waste streams to simpler substances such as water and carbon dioxide.  It is also the product formed when raw sewage is mixed with bacteria-laden sludge, then stirred and aerated to destroy organic matter.

Product that results when primary effluent is mixed with bacteria-laden sludge and then agitated and aerated to promote biological treatment, speeding the breakdown of organic matter in raw sewage und [..]

Product that results when primary effluent is mixed with bacteria-laden sludge and then agitated and aerated to promote biological treatment, speeding the breakdown of organic matter in raw sewage [..]

The term "activated sludge" refers to a brownish flocculent culture of organisms developed in aeration tanks under controlled conditions. It is also Sludge floc produced in raw or settled waste water by the growth of zoological bacteria and other organisms in the presence of dissolved oxygen. Activated sludge is normally brown in color. 

Sludge floc produced in raw or settled sewage by the growth of bacteria and other organisms in the presence of dissolved oxygen.

As process: A continuous biological treatment process done mainly by bacteria which oxidize carbonaceous and nitrogenous matter in wastewater.  As subject: a biological active floc composed mainly of [..]

Sludge particles produced in raw or settled wastewater (primary effluent) by the growth of organisms (including zoogleal bacteria) in aeration tanks in the presence of dissolved oxygen. The term activ [..]

Activated sludge itself is an aqueous suspension of microorganisms cultivated in a waste treatment process to break down organic matter into carbon dioxide, water, and other inorganic compounds. The activated sludge process has three basic components: 1) a reactor in which the microorganisms are kept in suspension and aerated; 2) liquid-solid separ [..]

Sludge withdrawn from the secondary clarifier in the activated sludge process, consisting of micro-organisms, non-living organic matter, and inorganic materials.

A method of sewage disposal in which the sewage is treated with 15% bacterially active, liquid sludge, which is produced by repeated vigorous aeration of fresh sewage to form floccules or sediment; when this flocculation process is complete, the resulting activated sludge contains large numbers of bacteria, together with yeasts, molds, and protozoa [..]

Sludge that has been aerated and subjected to bacterial action; used to speed the breakdown of organic matter in raw sewage during secondary waste treatment.

Sludge withdrawn from the secondary clarifier in the activated sludge process, consisting of living micro-organisms, non-living organic matter, and inorganic materials.

The active material , consisting largely bacteria and protozoa used to purify sewage.

An aerobic biological process for conversion of soluble organic matter to solid biomass, removable by gravity or filtration.

A term used to describe sludge that contains microorganisms that break down organic contaminants (e.g., benzene) in liquid waste streams to simpler substances such as water and carbon dioxide. It is a [..]