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 ?
"This is done by capturing the bugs in a final settlement tank and returning these to the start of the activated sludge process, thereby matching the food and bugs to the correct ratio: quite an ingenious process that considerably reduces the footprint of a wastewater treatment process, while having the ability to treat variable loads," he says.
The analysis could not take account of the heavy metals already present in the activated sludge, which also cannot be taken into account in actual WWTPs.
In this paper, Cuckoo Search Algorithm will be adapted and applied to parameter identification of a hybrid linear model which describes the dynamics of an activated sludge process for wastewater treatment [5].
A high concentration of activated sludge and rich microbial populations provide a good foundation for the reduction of COD.
Experimental water and activated sludge: The experimental water was made with glucose as carbon source, N[H.sub.4]Cl as nitrogen source, certain amount of Mg, P, Fe, Ca, and Zn ions as trace nutrients, and sodium azide as inhibitor, following the instructions of pervious research [19].
Tannery wastewater treatment using activated sludge process system (Lab scale modeling).
Biological sludge was collected from the rubber industry of Shorubber (M) Sdn Bhd in Jejawi, Perlis which has extended aeration activated sludge plant.
The removal rates of TN and TP ranged from 93% to 95% and 33 - 39% the maximum removal rates obtained at 1.5 h and 2 h respectively In an activated sludge system nitrogen elements besides organic substrate are used for heterotrophic bacteria growth.
Biological wastewater treatment is based on the principle of biochemical oxidation of contaminants with the biocenosis of activated sludge. Protozoa and bacteria of activated sludge as a result of their vital functions perform biochemical oxidation of contaminants, followed by sorption, assimilation, and intracellular oxidation in the nitrification process.
As well it is known rheological measurements may be used as an operational guide or control technique [10] and also to determine the relevancy of rheological parameters as indicators of sludge quality [11]; in particular, hysteresis cycles area was carried out online in aeration tanks of activated sludge as a way of detecting the appearance of filamentous bulkings and their evolution [12].
Activated sludge process (ASP) is the most commonly used process to reduce the toxicity of waste water by processing it microbiologically.

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