activated sludge


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Related to activated sludge: Trickling filter, activated sludge method

activated sludge

[′ak·tə‚vād·əd ′sləj]
(civil engineering)
A semiliquid mass removed from the liquid flow of sewage and subjected to aeration and aerobic microbial action; the end product is dark to golden brown, partially decomposed, granular, and flocculent, and has an earthy odor when fresh.

activated sludge

Sewage sediment that has been subjected to vigorous aeration and the action of microorganisms.
References in periodicals archive ?
Each reactor was inoculated with anaerobic inoculum obtained from the previous experiment with the anaerobic digestion of the primary-waste activated sludge mixture (Ofverstrom et al.
The aim of this study was to investigate the aerobic biodegradability of phenolic compounds characteristic to the oil-shale industry wastewaters--phenol, resorcinol and 5-methylresorcinol as both single and mixed substrates at different concentrations by the activated sludge of the Kohtla-Jarve WWTP and to obtain more information how these compounds influence each other's biodegradation.
The Freundlich model described the experimental equilibrium uptake of Pb(II) and Cu(II) ions by the resting activated sludge better than the Langmuir model.
In case of the returned activated sludge too, the sample without CMC was drier.
Membrane bioreactor, activated sludge process and fixed-film process have been built using standard shipping containers, too.
Table 1 presents flocs counts in aerobic activated sludge during the first experiment.
Comparison of bacteriophage and enteric virus removal in pilot scale activated sludge plants.
Biofilm bioreactor processes are increasingly being favored instead of activated sludge or SBR processes.
Many problems can be eliminated by control of the key growth pressures in an activated sludge system.
This objective of the study was to determine the effect of temperature on the treatment efficiency of COD (chemical oxygen demand) from pharmaceutical wastewater by batch activated sludge reactors and a two stage activated sludge reactors Batch activated sludge reactors were operated at various temperatures from 30 to 70 UC.
It has been shown that introducing ozone directly into the activated sludge reactor can improve biological treatment of wastewater [4].

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